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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Held-to-maturity Securities, Amortized Cost    
Within one year $ 5,327 $ 6,194
After one but within five years 2,269 5,481
After five years through ten years 56,183 59,231
After ten years 78,434 86,300
Total 142,213 157,206
Held-to-maturity Securities, Fair Value    
Within one year 5,335 6,182
After one but within five years 2,318 5,492
After five years through ten years 58,018 58,120
After ten years 79,447 84,100
Total 145,118 153,894
Available-for-sale Securities, Amortized Cost    
Within one year 5,475 9,863
After one but within five years 57,102 84,871
After five years through ten years 188,601 252,274
After ten years 97,191 118,902
Total 348,369 465,910
Available-for-sale Securities, Fair Value    
Within one year 5,478 9,795
After one but within five years 58,144 84,435
After five years through ten years 195,869 250,055
After ten years 99,233 118,179
Total $ 358,724 $ 462,464