Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
| | Fair Value Measurements at Reporting Date Using | |
| | | | | | | | | | Significant | | | Significant | |
| | | | | | | | | | Other Observable | | | Unobservable | |
| | | | | | | | | | Inputs | | | Inputs | |
(In thousands) | | Total | | | Level 1 | | | Level 2 | | | Level 3 | |
June 30, 2025 | | | | | | | | | | | | | | | | |
State and municipal securities | | $ | 10,170 | | | $ | — | | | $ | 10,170 | | | $ | — | |
Asset-backed securities | | | 7,013 | | | | — | | | | 7,013 | | | | — | |
Government mortgage-backed securities | | | 7,351 | | | | — | | | | 7,351 | | | | — | |
Total | | $ | 24,534 | | | $ | — | | | $ | 24,534 | | | $ | — | |
| | | | | | | | | | | | | | | | |
December 31, 2024 | | | | | | | | | | | | | | | | |
State and municipal securities | | $ | 10,551 | | | $ | — | | | $ | 10,551 | | | $ | — | |
Asset-backed securities | | | 7,216 | | | | — | | | | 7,216 | | | | — | |
Government mortgage-backed securities | | | 7,926 | | | | — | | | | 7,926 | | | | — | |
Total | | $ | 25,693 | | | $ | — | | | $ | 25,693 | | | $ | — | |
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Fair Value Measurements, Nonrecurring [Table Text Block] |
| | Fair Value Measurements at Reporting Date Using: | |
| | | | | | Quoted Prices in | | | Significant | | | Significant | |
| | | | | | Active Markets for | | | Other Observable | | | Unobservable | |
| | | | | | Identical Assets | | | Inputs | | | Inputs | |
(In thousands) | | Total | | | Level 1 | | | Level 2 | | | Level 3 | |
June 30, 2025 | | | | | | | | | | | | | | | | |
Loans | | | | | | | | | | | | | | | | |
Enterprise value | | $ | 6,806 | | | $ | — | | | $ | — | | | $ | 6,806 | |
Total | | $ | 6,806 | | | $ | — | | | $ | — | | | $ | 6,806 | |
| | | | | | | | | | | | | | | | |
December 31, 2024 | | | | | | | | | | | | | | | | |
Loans | | | | | | | | | | | | | | | | |
Enterprise value | | $ | 7,471 | | | $ | — | | | $ | — | | | $ | 7,471 | |
Total | | $ | 7,471 | | | $ | — | | | $ | — | | | $ | 7,471 | |
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Fair Value, by Balance Sheet Grouping [Table Text Block] |
| | Carrying | | | Fair Value | |
(In thousands) | | Amount | | | Level 1 | | | Level 2 | | | Level 3 | | | Total | |
June 30, 2025 | | | | | | | | | | | | | | | | | | | | |
Financial assets: | | | | | | | | | | | | | | | | | | | | |
Cash and cash equivalents | | $ | 128,909 | | | $ | 128,909 | | | $ | — | | | $ | — | | | $ | 128,909 | |
Available-for-sale debt securities | | | 24,534 | | | | — | | | | 24,534 | | | | — | | | | 24,534 | |
Federal Home Loan Bank of Boston stock | | | 2,242 | | | | N/A | | | | N/A | | | | N/A | | | | N/A | |
Loans, net | | | 1,293,469 | | | | — | | | | — | | | | 1,269,988 | | | | 1,269,988 | |
Accrued interest receivable | | | 4,877 | | | | — | | | | 4,877 | | | | — | | | | 4,877 | |
Financial liabilities: | | | | | | | | | | | | | | | | | | | | |
Deposits | | | 1,257,978 | | | | — | | | | 1,258,464 | | | | — | | | | 1,258,464 | |
Borrowings | | | 34,495 | | | | — | | | | 33,560 | | | | — | | | | 33,560 | |
| | | | | | | | | | | | | | | | | | | | |
December 31, 2024 | | | | | | | | | | | | | | | | | | | | |
Financial assets: | | | | | | | | | | | | | | | | | | | | |
Cash and cash equivalents | | $ | 169,142 | | | $ | 169,142 | | | $ | — | | | $ | — | | | $ | 169,142 | |
Available-for-sale debt securities | | | 25,693 | | | | — | | | | 25,693 | | | | — | | | | 25,693 | |
Federal Home Loan Bank of Boston stock | | | 2,697 | | | | N/A | | | | N/A | | | | N/A | | | | N/A | |
Loans, net | | | 1,305,508 | | | | — | | | | — | | | | 1,272,387 | | | | 1,272,387 | |
Accrued interest receivable | | | 5,296 | | | | — | | | | 5,296 | | | | — | | | | 5,296 | |
Assets held for sale | | | 2,256 | | | | — | | | | 2,950 | | | | — | | | | 2,950 | |
Financial liabilities: | | | | | | | | | | | | | | | | | | | | |
Deposits | | | 1,308,960 | | | | — | | | | 1,309,492 | | | | — | | | | 1,309,492 | |
Borrowings | | | 44,563 | | | | — | | | | 43,492 | | | | — | | | | 43,492 | |
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