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Loans and Allowance for Loan Losses ("ALLL") - Additional Information (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
Loans And Leases Receivable Disclosure [Line Items]      
Balance of SBA and USDA loans and participations serviced $ 14,300,000 $ 19,300,000  
Overdrafts included in loans 2,700,000 1,300,000  
Pledged loans for borrowing lines at FHLB and FRB 2,553,227,000 1,714,103,000  
Balance of main street lending program loans and participations serviced 58,000,000 56,300,000  
Main street lending program loans outstanding 3,100,000 4,800,000  
Purchased loans 9,600,000 12,800,000  
Unamortized premiums 167,000 223,000  
Purchased participation loans 63,900,000 27,900,000  
Recorded Investment 90 Days or More Past Due and Still Accruing $ 26,095,000 $ 1,506,000  
Threshold period for past due loans (in days) 90 days    
Number of loans restructured as troubled debt restructurings | loan 0 0  
Additional funds to borrowers with troubled debt restructurings $ 0    
Troubled debt restructuring 0 $ 0  
Loans receivable 2,627,256,000 1,742,735,000  
Net charge-offs $ 74,029,000 28,632,000 $ 19,262,000
CCBX      
Loans And Leases Receivable Disclosure [Line Items]      
Company's responsibility for credit losses (in percent) 10.00%    
Loans receivable $ 114,500,000    
Amount of loans that company is responsible for credit loss $ 11,500,000    
Partner's responsibility for credit losses (in percent) 90.00%    
Partner's responsibility for fraud losses (in percentage) 100.00%    
Percentage of revenue earned by company on loans they are responsible for credit losses 100.00%    
Net charge-offs $ 216,000    
Federal Home Loan Bank Advances      
Loans And Leases Receivable Disclosure [Line Items]      
Pledged loans for borrowing lines at FHLB and FRB $ 220,100,000 183,500,000  
Minimum      
Loans And Leases Receivable Disclosure [Line Items]      
Percentage of collateral coverage to loan balance 100.00%    
Loan repayment extended period of time 6 months    
Sustained repayment performance period of loan placed on nonaccrual 6 months    
Community Bank Overdrafts      
Loans And Leases Receivable Disclosure [Line Items]      
Overdrafts included in loans $ 94,000 13,000  
CCBX Overdrafts      
Loans And Leases Receivable Disclosure [Line Items]      
Overdrafts included in loans 2,600,000 1,300,000  
CCBX Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Consumer and other loans 607,000,000 106,800,000  
Commercial and industrial loans 11,300,000 281,000  
Residential real estate loans 244,600,000 36,900,000  
Unsecured C C B X Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Commercial and industrial loans 14,900,000 0  
Commercial and industrial loans - capital call lines      
Loans And Leases Receivable Disclosure [Line Items]      
Commercial and industrial loans 146,000,000 202,900,000  
Commercial and industrial loans      
Loans And Leases Receivable Disclosure [Line Items]      
Capital call lines, provided to venture capital firms   202,900,000  
Net charge-offs 4,831,000 3,221,000 $ 3,353,000
Commercial and industrial loans | CARES Act Paycheck Protection Program      
Loans And Leases Receivable Disclosure [Line Items]      
Balance of SBA and USDA loans and participations serviced $ 4,700,000 111,800,000  
Commercial and industrial loans | Small Business Administration      
Loans And Leases Receivable Disclosure [Line Items]      
Percentage of unsecured, guaranteed and loan 100.00%    
Consumer Loans | CCBX Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Purchased loans $ 157,400,000 59,700,000  
Consumer and other loans $ 146,100,000 $ 59,400,000  
Consumer Portfolio Segment | Installment/Closed-End Consumer Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Threshold period for past due loans (in days) 120 days    
Threshold period for past due loans, charge off (in days) 120 days    
Consumer Portfolio Segment | Revolving/Open-End Consumer Loans      
Loans And Leases Receivable Disclosure [Line Items]      
Threshold period for past due loans (in days) 180 days    
Threshold period for past due loans, charge off (in days) 180 days