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Investment Securities - Amortized cost and estimated fair value (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Amortized Cost  
Due within one year or less $ 3,469
Due after one year through five years 31,607
Due after five years through ten years 155,141
Due after 10 years 387,923
Total investment securities available-for-sale 578,140
Fair Value  
Due within one year or less 3,486
Due after one year through five years 32,256
Due after five years through ten years 160,462
Due after 10 years 396,138
Total investment securities available-for-sale $ 592,342