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Loans Receivable and Allowance for Credit losses (Delinquency Status of Total Loans) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | $ 3,317,402,000 | $ 3,082,418,000
Loans Receivable >90 Days and Accruing | 0 | 0
Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 32,654,000 | 9,428,000
30 To 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 15,338,000 | 3,305,000
60 To 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 8,487,000 | 1,857,000
Greater Than 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 8,829,000 | 4,266,000
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 3,284,748,000 | 3,072,990,000
Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 248,295,000 | 250,123,000
Commercial And Multi-Family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 2,434,115,000 | 2,345,229,000
Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 192,816,000 | 144,931,000
Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 372,202,000 | 282,007,000
Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 66,331,000 | 56,888,000
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 3,643,000 | 3,240,000
Originated Loans [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 248,295,000 | 250,123,000
Originated Loans [Member] | Residential [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 4,971,000 | 567,000
Originated Loans [Member] | Residential [Member] | 30 To 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 4,701,000 | 253,000
Originated Loans [Member] | Residential [Member] | 60 To 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable |  | 314,000
Originated Loans [Member] | Residential [Member] | Greater Than 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 270,000 |
Originated Loans [Member] | Residential [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 243,324,000 | 249,556,000
Originated Loans [Member] | Commercial And Multi-Family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 2,434,115,000 | 2,345,229,000
Originated Loans [Member] | Commercial And Multi-Family [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 16,571,000 | 2,591,000
Originated Loans [Member] | Commercial And Multi-Family [Member] | 30 To 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 1,853,000 | 2,163,000
Originated Loans [Member] | Commercial And Multi-Family [Member] | 60 To 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 7,876,000 | 428,000
Originated Loans [Member] | Commercial And Multi-Family [Member] | Greater Than 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 6,842,000 |
Originated Loans [Member] | Commercial And Multi-Family [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 2,417,544,000 | 2,342,638,000
Originated Loans [Member] | Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 192,816,000 | 144,931,000
Originated Loans [Member] | Construction [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 4,227,000 | 3,180,000
Originated Loans [Member] | Construction [Member] | 30 To 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 3,641,000 |
Originated Loans [Member] | Construction [Member] | Greater Than 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 586,000 | 3,180,000
Originated Loans [Member] | Construction [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 188,589,000 | 141,751,000
Originated Loans [Member] | Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 372,202,000 | 282,007,000
Originated Loans [Member] | Commercial Business [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 5,978,000 | 2,391,000
Originated Loans [Member] | Commercial Business [Member] | 30 To 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 4,236,000 | 190,000
Originated Loans [Member] | Commercial Business [Member] | 60 To 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 611,000 | 1,115,000
Originated Loans [Member] | Commercial Business [Member] | Greater Than 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 1,131,000 | 1,086,000
Originated Loans [Member] | Commercial Business [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 366,224,000 | 279,616,000
Originated Loans [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 66,331,000 | 56,888,000
Originated Loans [Member] | Home Equity [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 907,000 | 699,000
Originated Loans [Member] | Home Equity [Member] | 30 To 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 907,000 | 699,000
Originated Loans [Member] | Home Equity [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 65,424,000 | 56,189,000
Originated Loans [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 3,643,000 | 3,240,000
Originated Loans [Member] | Consumer [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | $ 3,643,000 | $ 3,240,000

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