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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Held-to-maturity Securities, Amortized Cost    
Within one year $ 6,949 $ 6,194
After one but within five years 3,649 5,481
After five years through ten years 58,337 59,231
After ten years 83,910 86,300
Total 152,845 157,206
Held-to-maturity Securities, Fair Value    
Within one year 6,945 6,182
After one but within five years 3,664 5,492
After five years through ten years 58,048 58,120
After ten years 82,597 84,100
Total 151,254 153,894
Available-for-sale Securities, Amortized Cost    
Within one year 9,104 9,863
After one but within five years 71,592 84,871
After five years through ten years 243,869 252,274
After ten years 117,821 118,902
Total 442,386 465,910
Available-for-sale Securities, Fair Value    
Within one year 9,058 9,795
After one but within five years 71,425 84,435
After five years through ten years 244,875 250,055
After ten years 117,527 118,179
Total $ 442,885 $ 462,464