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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Held-to-maturity Securities, Amortized Cost    
Within one year $ 453 $ 101
After one but within five years 90,541 25,666
After five years through ten years 260,148 182,604
After ten years 608,725 133,851
Total 959,867 342,222
Held-to-maturity Securities, Fair Value    
Within one year 450 103
After one but within five years 86,684 26,559
After five years through ten years 220,313 182,303
After ten years 521,601 133,790
Total 829,048 342,755
Available-for-sale Securities, Amortized Cost    
Within one year 1,831 10,785
After one but within five years 273,040 219,474
After five years through ten years 256,608 299,937
After ten years 379,997 639,324
Total 911,476 1,169,520
Available-for-sale Securities, Fair Value    
Within one year 1,813 10,841
After one but within five years 251,164 219,957
After five years through ten years 228,766 300,187
After ten years 330,750 636,583
Total $ 812,493 $ 1,167,568