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Loans and Allowance for Credit Losses - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
loan
category
Category
borrower
Dec. 31, 2022
USD ($)
loan
property
borrower
Dec. 31, 2021
USD ($)
Activity in the allowance for loan losses:      
Servicing asset $ 184,300,000 $ 164,100,000  
Foreclosed properties held $ 800,000 $ 1,200,000  
Number foreclosed properties held | property   5  
Number of additional collateralized loans in the process of foreclosure | loan   10  
Investment in loans in the process of foreclosure   $ 2,100,000  
Number of points in internal risk rating system | category 9    
Number of categories in internal risk rating system considered as not criticized | Category 6    
Commercial relationship credit review threshold amount $ 1,000,000    
Total impaired loans, recorded investment 11,800,000 18,247,000  
Impaired loans with specific allowance, related allowance 1,900,000 1,743,000  
Provision (release of allowance) for credit losses (1,921,000) 14,194,000 $ (6,275,000)
Total loans modified in period 22,192,000    
Specific reserve allocations for TDR's   400,000  
Troubled debt restructuring loans   10,400,000  
Loans defaulted under the restructured terms $ 2,634,000    
Payment Delay      
Activity in the allowance for loan losses:      
Number of loans modified in period | loan 18    
Number of borrowers with modified loans | borrower 17    
Total loans modified in period $ 19,736,000    
Loans defaulted under the restructured terms $ 2,634,000    
Minimum      
Activity in the allowance for loan losses:      
Percentage of commercial outstanding loan balances 40.00%    
Maximum      
Activity in the allowance for loan losses:      
Percentage of commercial outstanding loan balances 45.00%    
Accruing      
Activity in the allowance for loan losses:      
Troubled debt restructuring loans   $ 4,700,000  
Accruing | Troubled Debt Restructured Loans | Portfolio Risk      
Activity in the allowance for loan losses:      
Percentage of total impaired loans   45.00%  
Total Past Due      
Activity in the allowance for loan losses:      
Amortized costs basis modified, past due $ 5,490,000    
Acquisition, development and construction      
Activity in the allowance for loan losses:      
Loans defaulted under the restructured terms   $ 5,700,000  
Number of loans to defaulted borrowers | loan   9  
Number of borrowers defaulted | borrower   7  
Acquisition, development and construction | Commercial Borrower One      
Activity in the allowance for loan losses:      
Loans defaulted under the restructured terms   $ 1,900,000  
Acquisition, development and construction | Commercial Borrower Three      
Activity in the allowance for loan losses:      
Loans defaulted under the restructured terms   3,100,000  
Acquisition, development and construction | Commercial Borrowers Four through Seven      
Activity in the allowance for loan losses:      
Loans defaulted under the restructured terms   200,000  
Restructured Equipment Loan | Commercial Borrower Two      
Activity in the allowance for loan losses:      
Loans defaulted under the restructured terms   500,000  
Unfunded Loan Commitment      
Activity in the allowance for loan losses:      
Provision (release of allowance) for credit losses $ (600,000) 0 $ 0
Residential real estate      
Activity in the allowance for loan losses:      
Foreclosed properties held   $ 200,000  
Number foreclosed properties held | loan 0    
Increase (decrease) in impaired loans (percentage)   16.70%  
Total impaired loans, recorded investment   $ 3,098,000  
Impaired loans with specific allowance, related allowance   $ 0  
Total loans modified in period $ 0    
Loans defaulted under the restructured terms 0    
Residential real estate | Payment Delay      
Activity in the allowance for loan losses:      
Total loans modified in period 0    
Loans defaulted under the restructured terms 0    
Residential real estate | Total Past Due      
Activity in the allowance for loan losses:      
Amortized costs basis modified, past due $ 0    
Total Commercial      
Activity in the allowance for loan losses:      
Number foreclosed properties held | loan 2,000,000    
Increase (decrease) in impaired loans (percentage)   83.30%  
Total impaired loans, recorded investment   $ 13,708,000  
Impaired loans with specific allowance, related allowance   1,475,000  
Total loans modified in period $ 22,192,000    
Loans defaulted under the restructured terms 2,634,000    
Total Commercial | Payment Delay      
Activity in the allowance for loan losses:      
Total loans modified in period 19,736,000    
Loans defaulted under the restructured terms 2,634,000    
Total Commercial | Total Past Due      
Activity in the allowance for loan losses:      
Amortized costs basis modified, past due 5,490,000    
Total Commercial | Real estate      
Activity in the allowance for loan losses:      
Total impaired loans, recorded investment   1,786,000  
Impaired loans with specific allowance, related allowance   222,000  
Total loans modified in period 12,903,000    
Loans defaulted under the restructured terms 0    
Total Commercial | Real estate | Payment Delay      
Activity in the allowance for loan losses:      
Total loans modified in period 11,201,000    
Loans defaulted under the restructured terms 0    
Total Commercial | Real estate | Total Past Due      
Activity in the allowance for loan losses:      
Amortized costs basis modified, past due 0    
Total Commercial | Business      
Activity in the allowance for loan losses:      
Total impaired loans, recorded investment   11,922,000  
Impaired loans with specific allowance, related allowance   1,253,000  
Total loans modified in period $ 8,535,000    
Number of modified loans, subsequent default | loan 2,000,000    
Loans defaulted under the restructured terms $ 2,634,000    
Total Commercial | Business | Payment Delay      
Activity in the allowance for loan losses:      
Number of loans modified in period | loan 1    
Total loans modified in period $ 8,535,000    
Loans defaulted under the restructured terms $ 2,634,000    
Total Commercial | Business | Total Past Due      
Activity in the allowance for loan losses:      
Number of past due modified loans | loan 8    
Amortized costs basis modified, past due $ 5,490,000    
Total Commercial | Business | Accounts Receivable | Payment Delay      
Activity in the allowance for loan losses:      
Number of loans modified in period | loan 1    
Total loans modified in period $ 200,000    
Total Commercial | Business | Equipment | Total Past Due      
Activity in the allowance for loan losses:      
Number of past due modified loans | loan 3,000,000    
Amortized costs basis modified, past due $ 1,700,000    
Total Commercial | Business | Government-Guaranteed Collateral | Payment Delay      
Activity in the allowance for loan losses:      
Number of loans modified in period | loan 16    
Total loans modified in period $ 8,300,000    
Total Commercial | Business | Government-Guaranteed Collateral | Total Past Due      
Activity in the allowance for loan losses:      
Number of past due modified loans | loan 5,000,000    
Amortized costs basis modified, past due $ 3,800,000    
Total Commercial | Acquisition, development and construction      
Activity in the allowance for loan losses:      
Total impaired loans, recorded investment   0  
Impaired loans with specific allowance, related allowance   $ 0  
Total loans modified in period 754,000    
Total Commercial | Acquisition, development and construction | Payment Delay      
Activity in the allowance for loan losses:      
Total loans modified in period 0    
Total Commercial | Acquisition, development and construction | Total Past Due      
Activity in the allowance for loan losses:      
Amortized costs basis modified, past due 0    
Consumer      
Activity in the allowance for loan losses:      
Number of additional collateralized loans in the process of foreclosure | property   3  
Investment in loans in the process of foreclosure   $ 1,000,000  
Total impaired loans, recorded investment   1,351,000  
Impaired loans with specific allowance, related allowance   $ 268,000  
Total loans modified in period 0    
Loans defaulted under the restructured terms 0    
Consumer | Payment Delay      
Activity in the allowance for loan losses:      
Total loans modified in period 0    
Loans defaulted under the restructured terms 0    
Consumer | Total Past Due      
Activity in the allowance for loan losses:      
Amortized costs basis modified, past due $ 0