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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Held-to-maturity Securities, Amortized Cost    
Within one year $ 245 $ 246
After one but within five years 20,203 7,550
After five years through ten years 58,465 52,113
After ten years 90,125 49,127
Total 169,038 109,036
Held-to-maturity Securities, Fair Value    
Within one year 246 250
After one but within five years 21,184 7,961
After five years through ten years 60,963 55,872
After ten years 91,745 51,102
Total 174,138 115,185
Available-for-sale Securities, Amortized Cost    
Within one year 14,263 11,530
After one but within five years 53,194 59,028
After five years through ten years 183,706 144,908
After ten years 253,771 157,572
Available-for-sale, amortized cost 504,934 373,038
Available-for-sale Securities, Fair Value    
Within one year 14,403 11,687
After one but within five years 55,835 62,397
After five years through ten years 189,492 154,089
After ten years 258,233 164,178
Total $ 517,963 $ 392,351