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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale, Amortized Cost    
Due after 3 months through one year $ 6,290  
Due after one through five years 33,810  
Due after ten years 15,000  
Agency mortgage-backed securities 388,282  
Total 443,382  
Available-for-sale, Estimated Fair Value    
Due after 3 months through one year 6,297  
Due after one through five years 34,265  
Due after ten years 15,225  
Agency mortgage-backed securities 392,753  
Estimated Fair Value $ 448,540 $ 385,079