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Loans - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jan. 31, 2020
Cash paid for paycheck protection program     $ 600,000,000      
PPP loans $ 287,000,000   287,000,000      
Anticipated credit losses (3,631,000) $ 1,868,000 (11,145,000) $ 45,655,000    
Loans and Leases Receivable, Loans in Process 458,156,000   458,156,000   $ 355,065,000  
Loan Purchase [Member]            
Purchase price of loans at acquisition 2,200,000,000 2,221,204,000 2,200,000,000 2,221,204,000    
Fair value of purchase price of loans at acquisition   2,247,317,000   2,247,317,000   $ 79,100,000
Financing receivable credit discount           7,700,000
Financing receivable non credit discount           $ 4,100,000
Scenario Plan [Member]            
Anticipated credit losses     5,600,000      
Subsequently Defaulted [Member]            
Financing Receivable, Allowance for Credit Losses, Period Increase (decrease)     0      
TDRs [Member]            
Financing Receivable, Modifications, Recorded Investment 11,900,000   11,900,000   16,600,000  
Specified Reserves, Provision for Troubled Debt Restructurings 616,000   616,000   883,000  
Loans and Leases Receivable, Impaired, Commitment to Lend 352,000   352,000   303,000  
Loans receivable deferred 13,000   13,000   53,450,000  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     5,900,000      
Financing Receivable, Allowance for Credit Losses, Period Increase (decrease) 367,000 3,000 $ 373,000 32,000    
TDRs [Member] | Subsequently Defaulted [Member]            
Financing Receivable, Allowance for Credit Losses, Period Increase (decrease)   $ 30,000   $ 45,000    
TDRs [Member] | Minimum [Member] | COVID-19 [Member]            
Loan modification payment term for either interest only deferral or principal and interest deferral     1 month      
TDRs [Member] | Maximum [Member] | COVID-19 [Member]            
Loan modification payment term for either interest only deferral or principal and interest deferral     9 months      
Consumer Portfolio Segment [Member]            
Loans and Leases Receivable, Loans in Process 910,000   $ 910,000   $ 784,000  
Unfunded Loan Commitments [Member]            
Unfunded loan commitments $ 1,400,000,000   $ 1,400,000,000