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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
 12 Months Ended
Jan. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for credit losses $ 67,300,000      
Troubled Debt Restructurings Internal Grading System Substandard   $ 2,900,000 $ 1,600,000  
Financing Receivables, Troubled Debt Restructuring   3,900,000 3,300,000  
Non-accrual loans for no related allowance amortized cost   2,000,000.0    
TDR loans evaluated on individual 100,000      
After-tax effect decreased retained earnings 14,200,000      
Loans and Leases Receivable, Allowance   60,754,000 55,743,000  
Provision for Loan and Lease Losses   (6,700,000) 15,871,000 $ 6,150,000
Aggregate principal balance outstanding commercial loans   232,400,000    
FDIC-assisted acquired loans class categories   74,200,000    
FDIC-acquired loans and remaining accretable yield   429,000    
FDIC-assisted acquired loans not loan class categories   98,600,000    
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans   100,000    
Allowance for unfunded commitment        
Allowance for credit losses 8,700,000      
Loans and Leases Receivable, Allowance 8,690,000 9,629,000 0  
PCI [Member]        
Allowance for credit losses 1,900,000      
Consumer and Mortgage Loans        
CARES Act Loan Modifications   1,200,000    
Aggregate principal balance outstanding commercial loans     18,200,000  
Adopted ASC 326 [Member]        
Loans and Leases Receivable, Allowance 11,600,000      
Adopted ASC 310-30 [Member]        
Non-accruing loans acquired   1,700,000 3,800,000  
FDIC-acquired Loans Accounted     $ 1,700,000  
Loans acquired and accounted   $ 74,200,000    
CECL Methodology [Member]        
Allowance for credit losses 11,600,000      
Allowance for credit loss remaining discount on loan 1,900,000      
CECL Methodology [Member] | Allowance for unfunded commitment        
Allowance for credit losses $ 8,700,000