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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Held-to-maturity Securities, Amortized Cost    
Within one year $ 0 $ 450
After one but within five years 89,625 87,418
After five years through ten years 266,785 262,072
After ten years 590,398 622,267
Total 946,808 972,207
Held-to-maturity Securities, Fair Value    
Within one year 0 446
After one but within five years 85,060 83,663
After five years through ten years 227,818 222,280
After ten years 513,189 538,850
Total 826,067 845,239
Available-for-sale Securities, Amortized Cost    
Within one year 26,665 1,254
After one but within five years 354,735 335,813
After five years through ten years 130,738 185,997
After ten years 344,028 369,541
Total 856,166 892,605
Available-for-sale Securities, Fair Value    
Within one year 25,344 1,239
After one but within five years 324,368 307,843
After five years through ten years 117,530 166,273
After ten years 303,700 326,741
Total $ 770,942 $ 802,096