XML 52 R40.htm IDEA: XBRL DOCUMENT v3.8.0.1
Securities - Contractual Maturity Date of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Amortized Cost    
Total $ 1,407,465 $ 1,408,996
Fair Value    
Total 1,370,769 1,391,862
Total debt securities    
Amortized Cost    
Due in one year or less 36,830 51,909
Due after one year through five years 348,958 368,846
Due after five years through ten years 189,435 162,061
Due after ten years 17,544 18,591
Total 592,767 601,407
Fair Value    
Due in one year or less 36,761 51,932
Due in one year or less 344,236 367,377
Due after five years through ten years 184,497 160,374
Due after ten years 16,876 18,191
Total 582,370 597,874
Mortgage-backed securities    
Amortized Cost    
Total 814,698 807,589
Fair Value    
Total $ 788,399 $ 793,988