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Investment Securities - Amortized cost and estimated fair value (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Amortized Cost  
Due within one year or less $ 5,480
Due after one year through five years 32,626
Due after five years through ten years 150,987
Due after 10 years 609,950
Total investment securities available-for-sale 799,043
Fair Value  
Due within one year or less 5,506
Due after one year through five years 33,180
Due after five years through ten years 153,408
Due after 10 years 603,003
Total investment securities available-for-sale $ 795,097