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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Feb. 28, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Total, Face Amount $ 674,883   $ 699,190
Total, Amortized Cost 665,906   688,509
Total, Gross Unrealized Gain 5,752   7,322
Total, Gross Unrealized Loss (5,374)   (1,713)
Total, Carrying Value 666,284   694,118
Commercial Mortgage Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Face Amount     17,013
Amortized cost   $ 24,038 17,783
Gross Unrealized Gain     0
Gross Unrealized Loss     (678)
Carrying Value/Estimated Fair Value     17,105
Held to Maturity, Face Amount 154,000   155,000
Held to Maturity, Amortized Cost 153,799   154,283
Held to Maturity, Gross Unrealized Gain 0   0
Held to Maturity, Gross Unrealized Loss 0   0
Held to Maturity, Carrying Value 153,799   154,283
Commercial Mortgage Backed Securities [Member] | Estimated Fair Value [Member] | Available-for-sale Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Face Amount 520,883   527,177
Amortized cost 512,107   516,443
Gross Unrealized Gain 5,752   7,322
Gross Unrealized Loss (5,374)   (1,035)
Carrying Value/Estimated Fair Value $ 512,485   $ 522,730