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Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2025
Commitments and Contingencies [Abstract] |
Schedule of financial instruments whose contract amounts represents off-balance sheet credit risk | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | September 30, 2025 | ​ | December 31, 2024
​ | ​ | (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​
Commitments to originate loans | ​ | $ | 22,141 | ​ | $ | 34,050
Unadvanced funds on lines of credit | ​ | ​ | 636,648 | ​ | ​ | 495,796
Unadvanced funds on construction loans | ​ | ​ | 425,944 | ​ | ​ | 416,450
Letters of credit | ​ | ​ | 5,608 | ​ | ​ | 6,043
​ | ​ | $ | 1,090,341 | ​ | $ | 952,339

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478898/942-825-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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