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Loans Receivable and Allowance for Credit Losses (Loan Portfolio by Pass Rating) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | $ 10,248 |  | $ 10,248 |  | $ 280,851
Total Loans, Fiscal Year Before Latest Fiscal Year | 285,409 |  | 285,409 |  | 959,372
Total Loans, Two Years Before Latest Fiscal Year | 900,452 |  | 900,452 |  | 333,030
Total Loans, Three Years Before Latest Fiscal Year | 319,537 |  | 319,537 |  | 276,923
Total Loans, Four Years Before Latest Fiscal Year | 232,831 |  | 232,831 |  | 72,067
Total Loans, Prior | 992,745 |  | 992,745 |  | 1,021,468
Total Loans, Revolving Loans | 338,812 |  | 338,812 |  | 372,776
Total Loans, Revolving Loans to Term Loans | 45,613 |  | 45,613 |  | 915
Total Gross Loans | 3,125,647 | $ 3,322,139 | 3,125,647 | $ 3,322,139 | 3,317,402
Gross Charge-Offs, Current Fiscal Year |  |  | 446 |  |
Prior, Gross charge-offs |  |  | 567 |  |
Revolving Loans, Gross Charge Writeoff |  |  | 5,206 |  | 805
Revolving Loans to Term Loans |  |  | 181 |  |
Gross Charge-Offs | 3,471 | 515 | 6,400 | 555 | 805
Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 4,537 |  | 4,537 |  | 17,080
Total Loans, Fiscal Year Before Latest Fiscal Year | 16,672 |  | 16,672 |  | 54,115
Total Loans, Two Years Before Latest Fiscal Year | 52,031 |  | 52,031 |  | 39,579
Total Loans, Three Years Before Latest Fiscal Year | 38,448 |  | 38,448 |  | 31,420
Total Loans, Four Years Before Latest Fiscal Year | 30,808 |  | 30,808 |  | 12,067
Total Loans, Prior | 98,554 |  | 98,554 |  | 94,034
Total Gross Loans | 241,050 | 251,845 | 241,050 | 251,845 | 248,295
Gross Charge-Offs |  |  |  |  |
Residential [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 4,537 |  | 4,537 |  | 17,080
Total Loans, Fiscal Year Before Latest Fiscal Year | 16,672 |  | 16,672 |  | 53,623
Total Loans, Two Years Before Latest Fiscal Year | 48,458 |  | 48,458 |  | 38,178
Total Loans, Three Years Before Latest Fiscal Year | 38,274 |  | 38,274 |  | 31,420
Total Loans, Four Years Before Latest Fiscal Year | 30,808 |  | 30,808 |  | 12,067
Total Loans, Prior | 97,836 |  | 97,836 |  | 93,764
Total Gross Loans | 236,585 |  | 236,585 |  | 246,132
Residential [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  |  |  |  | 492
Total Loans, Two Years Before Latest Fiscal Year | 3,573 |  | 3,573 |  | 91
Total Loans, Prior | 483 |  | 483 |  |
Total Gross Loans | 4,056 |  | 4,056 |  | 583
Residential [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Two Years Before Latest Fiscal Year |  |  |  |  | 1,310
Total Loans, Three Years Before Latest Fiscal Year | 174 |  | 174 |  |
Total Loans, Prior | 235 |  | 235 |  | 270
Total Gross Loans | 409 |  | 409 |  | 1,580
Commercial & Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 4,796 |  | 4,796 |  | 232,343
Total Loans, Fiscal Year Before Latest Fiscal Year | 223,698 |  | 223,698 |  | 827,382
Total Loans, Two Years Before Latest Fiscal Year | 808,537 |  | 808,537 |  | 228,846
Total Loans, Three Years Before Latest Fiscal Year | 221,404 |  | 221,404 |  | 218,343
Total Loans, Four Years Before Latest Fiscal Year | 189,686 |  | 189,686 |  | 51,284
Total Loans, Prior | 844,925 |  | 844,925 |  | 873,855
Total Loans, Revolving Loans | 3,840 |  | 3,840 |  | 2,062
Total Gross Loans | 2,296,886 | 2,444,887 | 2,296,886 | 2,444,887 | 2,434,115
Gross Charge-Offs |  |  |  |  |
Commercial & Multi-family [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 4,796 |  | 4,796 |  | 222,435
Total Loans, Fiscal Year Before Latest Fiscal Year | 213,898 |  | 213,898 |  | 778,076
Total Loans, Two Years Before Latest Fiscal Year | 729,222 |  | 729,222 |  | 224,823
Total Loans, Three Years Before Latest Fiscal Year | 184,014 |  | 184,014 |  | 214,768
Total Loans, Four Years Before Latest Fiscal Year | 170,664 |  | 170,664 |  | 50,755
Total Loans, Prior | 745,511 |  | 745,511 |  | 824,375
Total Loans, Revolving Loans | 3,700 |  | 3,700 |  | 1,922
Total Gross Loans | 2,051,805 |  | 2,051,805 |  | 2,317,154
Commercial & Multi-family [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year |  |  |  |  | 9,908
Total Loans, Fiscal Year Before Latest Fiscal Year | 9,800 |  | 9,800 |  | 34,375
Total Loans, Two Years Before Latest Fiscal Year | 63,684 |  | 63,684 |  |
Total Loans, Three Years Before Latest Fiscal Year | 29,972 |  | 29,972 |  |
Total Loans, Four Years Before Latest Fiscal Year | 9,888 |  | 9,888 |  | 529
Total Loans, Prior | 47,068 |  | 47,068 |  | 4,453
Total Loans, Revolving Loans | 140 |  | 140 |  | 140
Total Gross Loans | 160,552 |  | 160,552 |  | 49,405
Commercial & Multi-family [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  |  |  |  | 14,931
Total Loans, Two Years Before Latest Fiscal Year | 15,631 |  | 15,631 |  | 4,023
Total Loans, Three Years Before Latest Fiscal Year | 7,418 |  | 7,418 |  | 3,575
Total Loans, Four Years Before Latest Fiscal Year | 9,134 |  | 9,134 |  |
Total Loans, Prior | 52,346 |  | 52,346 |  | 45,027
Total Gross Loans | 84,529 |  | 84,529 |  | 67,556
Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 4 |  | 4 |  | 21,730
Total Loans, Fiscal Year Before Latest Fiscal Year | 37,556 |  | 37,556 |  | 75,574
Total Loans, Two Years Before Latest Fiscal Year | 37,747 |  | 37,747 |  | 59,564
Total Loans, Three Years Before Latest Fiscal Year | 56,447 |  | 56,447 |  | 22,048
Total Loans, Four Years Before Latest Fiscal Year | 7,157 |  | 7,157 |  |
Total Loans, Prior | 1,850 |  | 1,850 |  | 8,190
Total Loans, Revolving Loans | 5,710 |  | 5,710 |  | 5,710
Total Gross Loans | 146,471 | 185,202 | 146,471 | 185,202 | 192,816
Gross Charge-Offs |  |  |  |  |
Construction [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 4 |  | 4 |  | 21,730
Total Loans, Fiscal Year Before Latest Fiscal Year | 36,722 |  | 36,722 |  | 74,180
Total Loans, Two Years Before Latest Fiscal Year | 36,031 |  | 36,031 |  | 59,564
Total Loans, Three Years Before Latest Fiscal Year | 25,143 |  | 25,143 |  | 21,462
Total Loans, Prior |  |  |  |  | 5,878
Total Loans, Revolving Loans | 5,710 |  | 5,710 |  | 5,710
Total Gross Loans | 103,610 |  | 103,610 |  | 188,524
Construction [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Fiscal Year Before Latest Fiscal Year | 834 |  | 834 |  |
Total Loans, Two Years Before Latest Fiscal Year | 1,716 |  | 1,716 |  |
Total Loans, Three Years Before Latest Fiscal Year | 31,304 |  | 31,304 |  |
Total Loans, Four Years Before Latest Fiscal Year | 6,571 |  | 6,571 |  |
Total Loans, Prior | 1,850 |  | 1,850 |  |
Total Gross Loans | 42,275 |  | 42,275 |  |
Construction [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  |  |  |  | 1,394
Total Loans, Three Years Before Latest Fiscal Year |  |  |  |  | 586
Total Loans, Four Years Before Latest Fiscal Year | 586 |  | 586 |  |
Total Loans, Prior |  |  |  |  | 2,312
Total Gross Loans | 586 |  | 586 |  | 4,292
Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year |  |  |  |  | 3,179
Total Loans, Fiscal Year Before Latest Fiscal Year | 2,487 |  | 2,487 |  | 297
Total Loans, Two Years Before Latest Fiscal Year | 274 |  | 274 |  | 2,967
Total Loans, Three Years Before Latest Fiscal Year | 2,709 |  | 2,709 |  | 4,234
Total Loans, Four Years Before Latest Fiscal Year | 4,357 |  | 4,357 |  | 7,397
Total Loans, Prior | 41,360 |  | 41,360 |  | 39,208
Total Loans, Revolving Loans | 220,056 |  | 220,056 |  | 211,842
Total Loans, Revolving Loans to Term Loans | 1,165 |  | 1,165 |  | 150
Total Gross Loans | 272,408 | 269,254 | 272,408 | 269,254 | 269,274
Gross Charge-Offs |  |  | 567 | 1 |
Commercial Business [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year |  |  |  |  | 3,179
Total Loans, Fiscal Year Before Latest Fiscal Year | 2,487 |  | 2,487 |  | 297
Total Loans, Two Years Before Latest Fiscal Year | 274 |  | 274 |  | 2,967
Total Loans, Three Years Before Latest Fiscal Year | 830 |  | 830 |  | 4,234
Total Loans, Four Years Before Latest Fiscal Year | 4,357 |  | 4,357 |  | 7,080
Total Loans, Prior | 30,151 |  | 30,151 |  | 33,675
Total Loans, Revolving Loans | 196,086 |  | 196,086 |  | 201,008
Total Loans, Revolving Loans to Term Loans | 741 |  | 741 |  | 150
Total Gross Loans | 234,926 |  | 234,926 |  | 252,590
Commercial Business [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Three Years Before Latest Fiscal Year | 1,879 |  | 1,879 |  |
Total Loans, Four Years Before Latest Fiscal Year |  |  |  |  | 317
Total Loans, Prior | 6,702 |  | 6,702 |  | 830
Total Loans, Revolving Loans | 19,479 |  | 19,479 |  | 4,410
Total Loans, Revolving Loans to Term Loans | 424 |  | 424 |  |
Total Gross Loans | 28,484 |  | 28,484 |  | 5,557
Commercial Business [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Prior | 4,507 |  | 4,507 |  | 4,703
Total Loans, Revolving Loans | 3,494 |  | 3,494 |  | 6,424
Total Gross Loans | 8,001 |  | 8,001 |  | 11,127
Commercial Business [Member] | Loss [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Revolving Loans | 997 |  | 997 |  |
Total Gross Loans | 997 |  | 997 |  |
Business Express [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Revolving Loans | 55,394 |  | 55,394 |  | 102,928
Total Loans, Revolving Loans to Term Loans | 43,563 |  | 43,563 |  |
Total Gross Loans | 98,957 | 101,258 | 98,957 | 101,258 | 102,928
Gross Charge-Offs | 3,471 | 515 | 5,387 | 554 | 805
Business Express [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Revolving Loans | 50,282 |  | 50,282 |  | 101,531
Total Loans, Revolving Loans to Term Loans | 40,617 |  | 40,617 |  |
Total Gross Loans | 90,899 |  | 90,899 |  | 101,531
Business Express [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Revolving Loans | 3,595 |  | 3,595 |  | 600
Total Loans, Revolving Loans to Term Loans | 1,166 |  | 1,166 |  |
Total Gross Loans | 4,761 |  | 4,761 |  | 600
Business Express [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Revolving Loans | 1,517 |  | 1,517 |  | 797
Total Loans, Revolving Loans to Term Loans | 1,780 |  | 1,780 |  |
Total Gross Loans | 3,297 |  | 3,297 |  | 797
Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 304 |  | 304 |  | 5,022
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,828 |  | 3,828 |  | 1,533
Total Loans, Two Years Before Latest Fiscal Year | 1,453 |  | 1,453 |  | 553
Total Loans, Three Years Before Latest Fiscal Year | 515 |  | 515 |  | 769
Total Loans, Four Years Before Latest Fiscal Year | 725 |  | 725 |  | 1,280
Total Loans, Prior | 6,050 |  | 6,050 |  | 6,181
Total Loans, Revolving Loans | 53,806 |  | 53,806 |  | 50,228
Total Loans, Revolving Loans to Term Loans | 885 |  | 885 |  | 765
Total Gross Loans | 67,566 | 66,046 | 67,566 | 66,046 | 66,331
Gross Charge-Offs |  |  |  |  |
Home Equity [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 304 |  | 304 |  | 5,022
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,828 |  | 3,828 |  | 1,487
Total Loans, Two Years Before Latest Fiscal Year | 1,411 |  | 1,411 |  | 553
Total Loans, Three Years Before Latest Fiscal Year | 515 |  | 515 |  | 769
Total Loans, Four Years Before Latest Fiscal Year | 644 |  | 644 |  | 1,280
Total Loans, Prior | 6,050 |  | 6,050 |  | 6,181
Total Loans, Revolving Loans | 53,806 |  | 53,806 |  | 50,111
Total Loans, Revolving Loans to Term Loans | 673 |  | 673 |  | 553
Total Gross Loans | 67,231 |  | 67,231 |  | 65,956
Home Equity [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  |  |  |  | 46
Total Loans, Two Years Before Latest Fiscal Year | 42 |  | 42 |  |
Total Loans, Four Years Before Latest Fiscal Year | 81 |  | 81 |  |
Total Loans, Revolving Loans |  |  |  |  | 117
Total Loans, Revolving Loans to Term Loans | 212 |  | 212 |  | 212
Total Gross Loans | 335 |  | 335 |  | 375
Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 607 |  | 607 |  | 1,497
Total Loans, Fiscal Year Before Latest Fiscal Year | 1,168 |  | 1,168 |  | 471
Total Loans, Two Years Before Latest Fiscal Year | 410 |  | 410 |  | 1,521
Total Loans, Three Years Before Latest Fiscal Year | 14 |  | 14 |  | 109
Total Loans, Four Years Before Latest Fiscal Year | 98 |  | 98 |  | 39
Total Loans, Prior | 6 |  | 6 |  |
Total Loans, Revolving Loans | 6 |  | 6 |  | 6
Total Gross Loans | 2,309 | $ 3,647 | 2,309 | $ 3,647 | 3,643
Gross Charge-Offs |  |  | 446 |  |
Consumer [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Current Fiscal Year | 607 |  | 607 |  | 1,497
Total Loans, Fiscal Year Before Latest Fiscal Year | 1,148 |  | 1,148 |  | 471
Total Loans, Two Years Before Latest Fiscal Year | 410 |  | 410 |  | 1,521
Total Loans, Three Years Before Latest Fiscal Year | 14 |  | 14 |  | 109
Total Loans, Four Years Before Latest Fiscal Year | 98 |  | 98 |  | 39
Total Loans, Prior | 6 |  | 6 |  |
Total Loans, Revolving Loans | 6 |  | 6 |  | 6
Total Gross Loans | 2,289 |  | 2,289 |  | $ 3,643
Consumer [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Loans, Fiscal Year Before Latest Fiscal Year | 20 |  | 20 |  |
Total Gross Loans | $ 20 |  | $ 20 |  |

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