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Commitments and Contingencies (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Supply Commitment [Line Items]    
Loss contingencies for all legal claims $ 145,000 $ 1,300,000
Loss contingencies for all legal claims 145,000 1,300,000
Commitments to extend credit    
Supply Commitment [Line Items]    
Commitments and letters of credit 2,477,778,000 2,137,178,000
Standby letters of credit    
Supply Commitment [Line Items]    
Commitments and letters of credit 134,030,000 108,834,000
Other letters of credit    
Supply Commitment [Line Items]    
Commitments and letters of credit 36,495,000 40,508,000
Commitments to fund investments in affordable housing partnerships    
Supply Commitment [Line Items]    
Commitments and letters of credit $ 13,354,000 $ 15,148,000