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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Held-to-maturity Securities, Amortized Cost    
Within one year $ 246 $ 246
After one but within five years 8,847 7,550
After five years through ten years 62,415 52,113
After ten years 80,462 49,127
Total 151,970 109,036
Held-to-maturity Securities, Fair Value    
Within one year 248 250
After one but within five years 9,284 7,961
After five years through ten years 65,241 55,872
After ten years 81,983 51,102
Total 156,756 115,185
Available-for-sale Securities, Amortized Cost    
Within one year 15,013 11,530
After one but within five years 55,101 59,028
After five years through ten years 193,424 144,908
After ten years 244,799 157,572
Total 508,337 373,038
Available-for-sale Securities, Fair Value    
Within one year 15,219 11,687
After one but within five years 57,955 62,397
After five years through ten years 198,301 154,089
After ten years 247,093 164,178
Total $ 518,568 $ 392,351