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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity – Securities Held-to-maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Held-to-maturity, Amortized Cost    
Due after 3 months through one year $ 1,647  
Due after one year through five years 3,451  
Due after five years through ten years 18,077  
Due after ten years 67,046  
Agency mortgage-backed securities 251,162  
Total 341,383 $ 324,010
Held-to-maturity, Estimated Fair Value    
Due after 3 months through one year 1,651  
Due after one year through five years 3,483  
Due after five years through ten years 18,439  
Due after ten years 65,330  
Agency mortgage-backed securities 247,887  
Estimated Fair Value $ 336,790 $ 318,748