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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale, Amortized Cost    
Due after 3 months through one year $ 1,999  
Due after one through five years 39,454  
Due after five through ten years 4,048  
Due after ten years 15,000  
Agency mortgage-backed securities 324,077  
Total 384,578  
Available-for-sale, Estimated Fair Value    
Due after 3 months through one year 1,996  
Due after one through five years 39,659  
Due after five through ten years 4,062  
Due after ten years 15,132  
Agency mortgage-backed securities 324,230  
Estimated Fair Value $ 385,079 $ 206,335