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Securities - Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due after five years through ten years $ 303,524 $ 284,009
Total held-to-maturity debt securities 303,524 284,009
Fair Value    
Due after five years through ten years 280,917 282,288
Total held-to-maturity debt securities $ 280,917 $ 282,288