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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Held-to-maturity Securities, Amortized Cost    
Within one year $ 100 $ 101
After one but within five years 83,024 25,666
After five years through ten years 255,978 182,604
After ten years 592,485 133,851
Total 931,587 342,222
Held-to-maturity Securities, Fair Value    
Within one year 100 103
After one but within five years 81,968 26,559
After five years through ten years 228,380 182,303
After ten years 536,938 133,790
Total 847,386 342,755
Available-for-sale Securities, Amortized Cost    
Within one year 3,369 10,785
After one but within five years 260,444 219,474
After five years through ten years 300,994 299,937
After ten years 395,572 639,324
Total 960,379 1,169,520
Available-for-sale Securities, Fair Value    
Within one year 3,366 10,841
After one but within five years 247,749 219,957
After five years through ten years 280,179 300,187
After ten years 361,855 636,583
Total $ 893,149 $ 1,167,568