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Debt Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Feb. 28, 2015
Schedule of Available-for-sale Securities [Line Items]      
Total, Face Amount $ 522,391 $ 664,732  
Total, Amortized Cost 514,599 657,446  
Total, Gross Unrealized Gain 292 2,614  
Total, Gross Unrealized Loss (37,463) (13,718)  
Total, Estimated Fair Value 477,428 646,342  
Commercial Mortgage Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost     $ 24,038
Held-to-maturity, Face Amount 146,530 153,250  
Held-to-maturity, Amortized Cost 146,352 153,193  
Held-to-maturity, Gross Unrealized Gain 0 0  
Held-to-maturity, Gross Unrealized Loss 0 0  
Held-to-maturity, Estimated Fair Value 146,352 153,193  
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 375,861 511,482  
Amortized Cost 368,247 504,253  
Gross Unrealized Gain 292 2,614  
Gross Unrealized Loss (37,463) (13,718)  
Estimated Fair Value $ 331,076 $ 493,149