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Debt Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Feb. 28, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Total, Face Amount $ 664,732   $ 699,190
Total, Amortized Cost 657,446   688,509
Total, Gross Unrealized Gain 2,614   7,322
Total, Gross Unrealized Loss (13,718)   (1,713)
Total, Estimated Fair Value 646,342   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)
Estimated Fair Value     17,105
Held-to-maturity, Face Amount 153,250   155,000
Held-to-maturity, Amortized Cost 153,193   154,283
Held-to-maturity, Gross Unrealized Gain 0   0
Held-to-maturity, Gross Unrealized Loss 0   0
Held-to-maturity, Estimated Fair Value 153,193   154,283
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Face Amount 511,482   527,177
Amortized Cost 504,253   516,443
Gross Unrealized Gain 2,614   7,322
Gross Unrealized Loss (13,718)   (1,035)
Estimated Fair Value $ 493,149   $ 522,730