Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Financing Receivables, Investments and Real Estate - Analysis of Portfolio by Type of Obligor and Credit Quality (Detail)

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Our Portfolio - Financing Receivables, Investments and Real Estate - Analysis of Portfolio by Type of Obligor and Credit Quality (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables $ 477,900,000    
Financing receivables held-for-sale 7,200,000   24,800,000
Investments available-for-sale 43,447,000 67,600,000 3,213,000
Real estate 81,600,000    
Total 610,100,000    
% of Total Portfolio 100.00%    
Average Balance 11,200,000    
Federal [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables 201,400,000    
Financing receivables held-for-sale 7,200,000    
Investments available-for-sale       
Real estate       
Total 208,600,000    
% of Total Portfolio 34.20%    
Average Balance 7,600,000    
State, Local, Institutions [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables 73,300,000    
Investments available-for-sale       
Real estate       
Total 73,300,000    
% of Total Portfolio 12.00%    
Average Balance 24,400,000    
Commercial Externally Rated [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables 22,100,000    
Investments available-for-sale 21,100,000    
Real estate       
Total 43,200,000    
% of Total Portfolio 7.10%    
Average Balance 21,600,000    
Commercial Rated Internally [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables 180,300,000    
Investments available-for-sale 7,900,000    
Real estate 81,600,000    
Total 269,800,000    
% of Total Portfolio 44.20%    
Average Balance 12,900,000    
Commercial Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivables 800,000    
Investments available-for-sale 14,400,000    
Real estate       
Total 15,200,000    
% of Total Portfolio 2.50%    
Average Balance $ 14,400,000