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Investment Securities - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Held-to-maturity Securities, Amortized Cost    
Within one year $ 101 $ 101
After one but within five years 43,041 25,666
After five years through ten years 244,649 182,604
After ten years 502,473 133,851
Total 790,264 342,222
Held-to-maturity Securities, Fair Value    
Within one year 102 103
After one but within five years 42,969 26,559
After five years through ten years 227,772 182,303
After ten years 473,669 133,790
Total 744,512 342,755
Available-for-sale Securities, Amortized Cost    
Within one year 5,605 10,785
After one but within five years 260,143 219,474
After five years through ten years 312,767 299,937
After ten years 417,122 639,324
Available-for-sale, amortized cost 995,637 1,169,520
Available-for-sale Securities, Fair Value    
Within one year 5,618 10,841
After one but within five years 251,904 219,957
After five years through ten years 298,180 300,187
After ten years 399,755 636,583
Total $ 955,457 $ 1,167,568