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Securities - Amortized Cost and Estimated Fair Value (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Total, Face Amount $ 522,391
Total, Amortized Cost 514,599
Total, Gross Unrealized Gain 292
Total, Gross Unrealized Loss (37,463)
Total, Estimated Fair Value 477,428
Commercial Mortgage Backed Securities [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Held-to-maturity, Face Amount 146,530
Held-to-maturity, Amortized Cost 146,352
Held-to-maturity, Gross Unrealized Gain 0
Held-to-maturity, Gross Unrealized Loss 0
Held-to-maturity, Estimated Fair Value 146,352
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
Amortized Cost 368,247
Gross Unrealized Gain 292
Gross Unrealized Loss (37,463)
Estimated Fair Value $ 331,076