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Securities - Amortized Cost and Estimated Fair Value Of Available-For-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Amortized Cost    
Total $ 1,412,238 $ 1,441,724
Fair Value    
Total 1,405,311 1,428,617
Total debt securities    
Amortized Cost    
Due in one year or less 32,167 17,878
Due after one year through five years 403,739 376,777
Due after five years through ten years 172,316 210,985
Due after ten years 19,007 13,827
Total 627,229 619,467
Fair Value    
Due in one year or less 32,279 18,034
Due in one year or less 405,216 378,631
Due after five years through ten years 172,276 208,999
Due after ten years 18,636 13,181
Total 628,407 618,845
Mortgage-backed securities    
Amortized Cost    
Total 785,009 822,257
Fair Value    
Total $ 776,904 $ 809,772