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Securities (Details 3) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Amortized Cost    
Total $ 1,437,716 $ 1,441,724
Fair Value    
Total 1,426,606 1,428,617
Total debt securities    
Amortized Cost    
Due in one year or less 22,622 17,878
Due after one year through five years 406,443 376,777
Due after five years through ten years 178,452 210,985
Due after ten years 15,050 13,827
Total 622,567 619,467
Fair Value    
Due in one year or less 22,756 18,034
Due in one year or less 408,420 378,631
Due after five years through ten years 177,032 208,999
Due after ten years 14,486 13,181
Total 622,694 618,845
Mortgage-backed securities    
Amortized Cost    
Total 815,149 822,257
Fair Value    
Total $ 803,912 $ 809,772