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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Held-to-maturity Securities, Amortized Cost    
Within one year $ 52 $ 450
After one but within five years 85,323 87,418
After five years through ten years 268,433 262,072
After ten years 604,752 622,267
Total 958,560 972,207
Held-to-maturity Securities, Fair Value    
Within one year 51 446
After one but within five years 82,266 83,663
After five years through ten years 232,936 222,280
After ten years 534,872 538,850
Total 850,125 845,239
Available-for-sale Securities, Amortized Cost    
Within one year 1,132 1,254
After one but within five years 362,588 335,813
After five years through ten years 154,572 185,997
After ten years 353,537 369,541
Total 871,829 892,605
Available-for-sale Securities, Fair Value    
Within one year 1,124 1,239
After one but within five years 336,054 307,843
After five years through ten years 141,260 166,273
After ten years 319,095 326,741
Total $ 797,533 $ 802,096