v3.26.1
Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Apr. 30, 2026
Financing Receivable, Past Due [Line Items]            
Off-balance-sheet, credit loss, liability $ 1,100,000   $ 1,100,000   $ 693,000,000  
Financing receivable recorded amount 2,257,379,000   2,257,379,000   2,295,466,000  
Loans past due 90 days or more and still accruing 0   0   2,000  
Interest income on nonaccrual loans 0 $ 0 0 $ 0    
Loans modified to borrowers experiencing financial difficulty 0   0      
Additional commitments to the borrowers 0   0      
Servicing fee income 183,000 $ 206,000 $ 372,000 $ 422,000    
Mortgage servicing rights prepayment speed percentage     7.09%      
Derivatives Designated as Hedging instruments | Cash Flow Hedges            
Financing Receivable, Past Due [Line Items]            
Interest rate swaps, notional amounts 60,000,000   $ 60,000,000   135,000,000 $ 25,000,000
Financing Receivables Unpaid 120 Days or More            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount 1,300   1,300   1,200,000  
Allowance for credit losses 159,000   159,000      
Impairments         0  
Commercial Loans            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount 963,822,000   963,822,000   998,459,000  
Cash reserves from purchase price adjustments     497,000   352,000  
Aggregate amount of mortgage loans for participants 117,100,000   117,100,000   123,600,000  
Residential Real Estate            
Financing Receivable, Past Due [Line Items]            
Loans in process of foreclosure, amount 63,000   63,000   153,000  
Unpaid principal balances of loans serviced for others 254,600,000   254,600,000   261,100,000  
One to Four Family Residential            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount 517,975,000   517,975,000   518,225,000  
One to Four Family Residential | Commercial Loans            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount 517,975,000   517,975,000   518,225,000  
Condominium Associations            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount 494,331,000   494,331,000   506,683,000  
Condominium Associations | Commercial Loans            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount 494,331,000   $ 494,331,000   506,683,000  
PPP Loans            
Financing Receivable, Past Due [Line Items]            
Percentage of loan guaranteed     100.00%      
Financing receivable recorded amount         11,000  
PPP Loans | Commercial Loans            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount         11,000  
Home Equity and Consumer Loans            
Financing Receivable, Past Due [Line Items]            
Loan amount repayment period     90 days      
Factored Accounts Receivable | Commercial Loans            
Financing Receivable, Past Due [Line Items]            
Financing receivable recorded amount 3,500,000   $ 3,500,000   $ 2,200,000  
Minimum            
Financing Receivable, Past Due [Line Items]            
Financing receivable contractual past due period     30 days      
Mortgage servicing rights discount rate percentage     9.50%      
Minimum | One to Four Family Residential            
Financing Receivable, Past Due [Line Items]            
Loan-to-value ratio     80.00%      
Minimum | Condominium Associations            
Financing Receivable, Past Due [Line Items]            
Loan amount repayment period     5 years      
Maximum            
Financing Receivable, Past Due [Line Items]            
Mortgage servicing rights discount rate percentage     12.50%      
Maximum | Residential Real Estate            
Financing Receivable, Past Due [Line Items]            
Contingent recourse liability $ 894,000   $ 894,000      
Maximum | Condominium Associations            
Financing Receivable, Past Due [Line Items]            
Loan amount repayment period     30 years      
Maximum | Home Equity and Consumer Loans            
Financing Receivable, Past Due [Line Items]            
Loan amount repayment period     90 days