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Securities - Contractual Maturity Date of Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Amortized Cost    
Due in one year or less $ 6,636 $ 5,980
Due after one year through five years 62,088 51,936
Due after five years through ten years 70,407 81,300
Due after ten years   0
Total held-to-maturity debt securities 139,131 139,216
Fair Value    
Due in one year or less 6,638 5,979
Due after one year through five years 61,519 52,227
Due after five years through ten years 69,686 82,109
Due after ten years   0
Total held-to-maturity debt securities $ 137,843 $ 140,315