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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Held-to-maturity Securities, Amortized Cost    
Within one year $ 102 $ 246
After one but within five years 23,536 7,550
After five years through ten years 51,125 52,113
After ten years 122,038 49,127
Total 196,801 109,036
Held-to-maturity Securities, Fair Value    
Within one year 104 250
After one but within five years 24,725 7,961
After five years through ten years 53,105 55,872
After ten years 123,118 51,102
Total 201,052 115,185
Available-for-sale Securities, Amortized Cost    
Within one year 11,700 11,530
After one but within five years 75,784 59,028
After five years through ten years 314,110 144,908
After ten years 550,684 157,572
Available-for-sale, amortized cost 952,278 373,038
Available-for-sale Securities, Fair Value    
Within one year 11,818 11,687
After one but within five years 77,755 62,397
After five years through ten years 318,801 154,089
After ten years 554,659 164,178
Total $ 963,033 $ 392,351