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Securities - Available for Sale Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amortized Cost    
Amortized Cost $ 1,385,805 $ 1,408,996
Fair Value    
Total 1,343,690 1,391,862
Total available-for-sale securities    
Amortized Cost    
Due in one year or less 72,650 51,909
Due after one year through five years 335,687 368,846
Due after five years through ten years 166,258 162,061
Due after ten years 13,955 18,591
Amortized Cost 588,550 601,407
Fair Value    
Due in one year or less 72,406 51,932
Due in one year or less 329,350 367,377
Due after five years through ten years 160,972 160,374
Due after ten years 13,256 18,191
Total 575,984 597,874
Mortgage-backed securities    
Amortized Cost    
Amortized Cost 797,255 807,589
Fair Value    
Total $ 767,706 $ 793,988