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Commitments and Contingencies (Off-Balance Sheet Commitments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Commitments To Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 993,324 $ 1,012,810
Standby Letters Of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet commitments $ 22,970 $ 22,393