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Loans - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]        
PPP loans outstanding $ 5,928,933,000 $ 4,046,642,000    
Deferred processing fees (17,101,000) (9,519,000)    
Loans, net of allowance for loan losses 65,917,000 47,547,000 $ 47,766,000 $ 28,546,000
Accounts receivable, allowance for credit loss 45,000 0    
Recorded investment in troubled debt restructurings (TDRs) 17,086,000 21,699,000    
Increase of allowance for loan losses from modification 777,000 2,326,000 1,464,000  
TDRs loans charged off 0 0 0  
Total loans modified as (TDRs) with a subsequent default 122,000      
Accretable discount on loans acquired 10,292,000 571,000    
Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
PPP loans outstanding 3,025,074,000 2,414,787,000    
Loans, net of allowance for loan losses 42,847,000 33,277,000 $ 32,009,000 $ 17,509,000
Paycheck Protection Program CARES Act | Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
PPP loans outstanding 4,391,000 68,401,000    
Deferred processing fees 39,000 1,652,000    
Loans, net of allowance for loan losses $ 0 $ 0