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Securities - Amortized Cost and Estimated Fair Value of Investment Securities by Contractual Maturity (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Amortized Cost  
Less than one year $ 100,483
Due after one year through five years 148,332
Due after five years through ten years 275,734
Due after ten years 294,395
Amortized Cost, Total investment securities 818,944
Estimated Fair Value  
Less than one year 101,018
Due after one year through five years 150,222
Due after five years through ten years 274,360
Due after ten years 301,961
Estimated Fair Value, Total investment securities $ 827,561