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 $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]  
Financing receivables $ 456.0
Investments available-for-sale 67.7
Real estate investments 67.2
Total 590.9
% of Total Portfolio 100.00%
Average Balance 11.7
Federal [Member]
  
Financing Receivable, Recorded Investment [Line Items]  
Financing receivables 195.9
Investments available-for-sale   
Real estate investments   
Total 195.9
% of Total Portfolio 33.10%
Average Balance 7.7
State, Local, Institutions [Member]
  
Financing Receivable, Recorded Investment [Line Items]  
Financing receivables 73.8
Investments available-for-sale   
Real estate investments   
Total 73.8
% of Total Portfolio 12.50%
Average Balance 24.6
Commercial Externally Rated [Member]
  
Financing Receivable, Recorded Investment [Line Items]  
Financing receivables 22.0
Investments available-for-sale 43.3
Real estate investments   
Total 65.3
% of Total Portfolio 11.10%
Average Balance 21.8
Commercial Rated Internally [Member]
  
Financing Receivable, Recorded Investment [Line Items]  
Financing receivables 163.5
Investments available-for-sale 7.8
Real estate investments 67.2
Total 238.5
% of Total Portfolio 40.40%
Average Balance 13.3
Commercial Other [Member]
  
Financing Receivable, Recorded Investment [Line Items]  
Financing receivables 0.8
Investments available-for-sale 16.6
Real estate investments   
Total 17.4
% of Total Portfolio 2.90%
Average Balance $ 16.6