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Loans - Summary of Purchased Loans Pools (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Segment
Dec. 31, 2024
USD ($)
Segment
Loan
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 170,350 $ 170,350
Current Balance 68,264 75,660
Unamortized Premium/ (Discount) $ (5,790) $ (5,964)
Number of Loans | Segment 2,613 2,677
Cumulative net charge-offs $ 3,052 $ 3,018
Commercial and Industrial Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance 6,800 6,800
Current Balance $ 1,100 $ 1,200
Number of Loans | Segment 18 19
Commercial and Industrial Loans [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 5 years 5 years
Commercial and Industrial Loans [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 1 year 1 year
Home Equity Lines of Credit [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 21,900 $ 21,900
Current Balance 3,300 3,500
Unamortized Premium/ (Discount) $ 4 $ 5
Number of Loans | Segment 88 92
Cumulative net charge-offs $ 97 $ 97
Home Equity Lines of Credit [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 25 years 25 years
Home Equity Lines of Credit [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 4 years 4 years
Unsecured Consumer Loan Pool 2 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 26,600 $ 26,600
Current Balance 4 $ 10
Unamortized Premium/ (Discount) $ 0  
Number of Loans | Segment 3 12
Unsecured Consumer Loan Pool 2 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 1 year 1 year
Unsecured Consumer Loan Pool 2 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 0 years 0 years
Residential Real Estate Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 4,300 $ 4,300
Current Balance 4,200 4,200
Unamortized Premium/ (Discount) $ 277 $ 278
Number of Loans | Segment 54 54
Residential Real Estate Loans [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 24 years 25 years
Residential Real Estate Loans [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 16 years 16 years
Unsecured Consumer Loan Pool 1 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 5,400 $ 5,400
Current Balance $ 400 $ 500
Number of Loans | Segment 36 41
Unsecured Consumer Loan Pool 1 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 2 years 2 years
Unsecured Consumer Loan Pool 1 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 0 years 1 year
Unsecured Consumer Installment Loans Pool 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance [1] $ 10,300 $ 10,300
Current Balance [1] 160 150
Unamortized Premium/ (Discount) [1] $ 0 $ 3
Number of Loans | Segment [1] 65 79
Cumulative net charge-offs [1] $ 109 $ 112
Unsecured Consumer Installment Loans Pool 3 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range [1] 8 years 8 years
Unsecured Consumer Installment Loans Pool 3 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range [1] 0 years 0 years
Secured Consumer Installment Loans Pool 4 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 14,500 $ 14,500
Current Balance 9,000 9,300
Unamortized Premium/ (Discount) $ (1,212) $ (1,257)
Number of Loans | Segment 468 475
Cumulative net charge-offs $ 3 $ 22
Secured Consumer Installment Loans Pool 4 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 24 years 24 years
Secured Consumer Installment Loans Pool 4 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 20 years 21 years
Unsecured Consumer Loan Pool 5 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance [2] $ 24,400 $ 24,400
Current Balance [2] 12,300 12,600
Unamortized Premium/ (Discount) [2] $ (330) $ (342)
Number of Loans [2] 585 595
Cumulative net charge-offs [2] $ 1,192 $ 1,124
Unsecured Consumer Loan Pool 5 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range [2] 21 years 21 years
Unsecured Consumer Loan Pool 5 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range [2] 6 years 6 years
Revolving Commercial Line of Credit 1 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 1,050 $ 1,050
Current Balance 7,000 4,800
Unamortized Premium/ (Discount) $ 28 $ 31
Number of Loans 1 1
Revolving Commercial Line of Credit 1 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 1 year 1 year
Revolving Commercial Line of Credit 1 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 0 years 0 years
Secured Consumer Installment Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 21,300 $ 21,300
Current Balance 16,000 16,300
Unamortized Premium/ (Discount) $ (2,541) $ (2,613)
Number of Loans | Segment 794 802
Cumulative net charge-offs $ 506 $ 467
Secured Consumer Installment Loans [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 24 years 24 years
Secured Consumer Installment Loans [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 16 years 17 years
Revolving Commercial Line of Credit 2 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance $ 11,600 $ 11,600
Current Balance 0 $ 7,900
Unamortized Premium/ (Discount) $ 0  
Number of Loans | Segment 1 1
Revolving Commercial Line of Credit 2 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range   1 year
Revolving Commercial Line of Credit 2 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range 0 years 0 years
Unsecured Consumer Loan Pool 6 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Original Balance [2] $ 22,200 $ 22,200
Current Balance [2] 14,800 15,200
Unamortized Premium/ (Discount) [2] $ (2,016) $ (2,069)
Number of Loans | Segment [2] 500 506
Cumulative net charge-offs [2] $ 1,145 $ 1,196
Unsecured Consumer Loan Pool 6 [Member] | Maximum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range [2] 23 years 23 years
Unsecured Consumer Loan Pool 6 [Member] | Minimum [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Range [2] 6 years 7 years
[1] 2 In December 2023, the primary servicer for a purchased pool of consumer installment loans declared bankruptcy and the Bank placed the loans within the serviced pool on nonaccrual status pending the release of collected funds by the U.S. Bankruptcy Court of jurisdiction. The current balance reflects anticipated principal payments that are expected to be received from the pool’s underlying borrowers. At March 31, 2025, approximately $155,000 remains due from borrowers under the scheduled repayment terms of their original loan agreements. Under a series of released orders from the Court, monthly payments to the Bank resumed in late 2024 and the Bank’s management expects to ultimately collect substantially all of the outstanding principal balance collected from the pool’s underlying borrowers. Therefore, management does not consider the loans in this pool to be impaired and the loans within the serviced pool are back on accrual status at March 31, 2025.
[2]

1 On December 7, 2023, the Bank settled two pay-fixed interest rate swap derivative contracts, previously established with an unaffiliated third party and designated as fair value interest rate hedges. The hedging swap contracts were related to two purchased consumer installment loan pools comprised of loans secured by residential home solar power infrastructure. These contracts were entered into on February 13, 2021 (notional amount of $12.2 million) and December 8, 2021 (notional amount of $8.5 million). The Bank realized gains related to the settlement of these two hedging contracts were $117,000 and $694,000, respectively. These gains on the extinguishment of the hedging swap contracts are reported as a reduction of the carrying value of the hedged loan pools and will be recognized as an enhancement to the reported yield on those loan pools over the original contractual life of the hedging swap contracts. The unamortized portion of these gains totaled $676,000 at March 31, 2025.