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Loans Receivable and Allowance for Credit Losses (Allowance for Credit Losses) (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 | Sep. 30, 2022 | [1] | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | $ 35,243 |  | $ 30,205 |  | $ 33,608 |  | $ 32,373 |  |  | $ 32,373
Allowance for credit losses: Charge-offs | (3,471) |  | (515) |  | (6,400) |  | (555) |  |  | (805)
Allowance for credit losses: Recoveries | 31 |  | 19 |  | 69 |  | 84 |  |  | 101
Provision (benefit) for credit losses | 2,890 | [1] | 2,205 | [1] | 7,416 | [1] | 4,177 | [1] | $ (2,575) | 6,104
Allowance for credit losses: Ending balance: individually evaluated | 6,068 |  | 2,772 |  | 6,068 |  | 2,772 |  |  | 4,229
Allowance for credit losses: Ending balance: collectively evaluated | 28,625 |  | 29,142 |  | 28,625 |  | 29,142 |  |  | 29,379
Allowance for credit losses: Ending Balance | 34,693 |  | 31,914 |  | 34,693 |  | 31,914 |  |  | 33,608
Loans receivables: Ending balance: individually evaluated | 66,048 |  | 35,868 |  | 66,048 |  | 35,868 |  |  | 54,019
Loans receivables: Ending balance: collectively evaluated | 3,059,599 |  | 3,286,271 |  | 3,059,599 |  | 3,286,271 |  |  | 3,263,383
Total Gross Loans | 3,125,647 |  | 3,322,139 |  | 3,125,647 |  | 3,322,139 |  |  | 3,317,402
Residential [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 2,039 |  | 2,453 |  | 2,344 |  | 2,474 |  |  | 2,474
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries | 8 |  | 14 |  | 33 |  | 38 |  |  | 45
Provision (benefit) for credit losses | 30 |  | (23) |  | (300) |  | (212) |  |  | (319)
Allowance for credit losses: Ending balance: individually evaluated |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 2,077 |  | 2,444 |  | 2,077 |  | 2,444 |  |  | 2,344
Allowance for credit losses: Ending Balance | 2,077 |  | 2,444 |  | 2,077 |  | 2,444 |  |  | 2,344
Loans receivables: Ending balance: individually evaluated | 235 |  | 355 |  | 235 |  | 355 |  |  | 444
Loans receivables: Ending balance: collectively evaluated | 240,815 |  | 251,490 |  | 240,815 |  | 251,490 |  |  | 247,851
Total Gross Loans | 241,050 |  | 251,845 |  | 241,050 |  | 251,845 |  |  | 248,295
Commercial & Multi-family [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 14,907 |  | 15,045 |  | 16,301 |  | 21,749 |  |  | 21,749
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  |  |  |  |
Provision (benefit) for credit losses | (1,371) |  | (595) |  | (2,765) |  | (176) |  |  | 1,675
Allowance for credit losses: Ending balance: individually evaluated | 971 |  |  |  | 971 |  |  |  |  | 990
Allowance for credit losses: Ending balance: collectively evaluated | 12,565 |  | 14,450 |  | 12,565 |  | 14,450 |  |  | 15,311
Allowance for credit losses: Ending Balance | 13,536 |  | 14,450 |  | 13,536 |  | 14,450 |  |  | 16,301
Loans receivables: Ending balance: individually evaluated | 56,869 |  | 23,843 |  | 56,869 |  | 23,843 |  |  | 42,259
Loans receivables: Ending balance: collectively evaluated | 2,240,017 |  | 2,421,044 |  | 2,240,017 |  | 2,421,044 |  |  | 2,391,856
Total Gross Loans | 2,296,886 |  | 2,444,887 |  | 2,296,886 |  | 2,444,887 |  |  | 2,434,115
Construction [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 2,872 |  | 4,090 |  | 3,841 |  | 2,094 |  |  | 2,094
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  |  |  |  |
Provision (benefit) for credit losses | (496) |  | 573 |  | (1,465) |  | 1,182 |  |  | 360
Allowance for credit losses: Ending balance: individually evaluated |  |  | 608 |  |  |  | 608 |  |  | 310
Allowance for credit losses: Ending balance: collectively evaluated | 2,376 |  | 4,055 |  | 2,376 |  | 4,055 |  |  | 3,531
Allowance for credit losses: Ending Balance | 2,376 |  | 4,663 |  | 2,376 |  | 4,663 |  |  | 3,841
Loans receivables: Ending balance: individually evaluated | 586 |  | 4,931 |  | 586 |  | 4,931 |  |  | 4,292
Loans receivables: Ending balance: collectively evaluated | 145,885 |  | 180,271 |  | 145,885 |  | 180,271 |  |  | 188,524
Total Gross Loans | 146,471 |  | 185,202 |  | 146,471 |  | 185,202 |  |  | 192,816
Commercial Business [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 8,323 |  | 5,379 |  | 5,811 |  | 4,495 |  |  | 4,495
Allowance for credit losses: Charge-offs |  |  |  |  | (567) |  | (1) |  |  |
Allowance for credit losses: Recoveries | 22 |  | 5 |  | 27 |  | 30 |  |  | 29
Provision (benefit) for credit losses | 531 |  | 2,782 |  | 3,605 |  | 1,908 |  |  | (447)
Allowance for credit losses: Ending balance: individually evaluated | 2,025 |  | 1,914 |  | 2,025 |  | 1,914 |  |  | 2,132
Allowance for credit losses: Ending balance: collectively evaluated | 6,851 |  | 6,252 |  | 6,851 |  | 6,252 |  |  | 3,679
Allowance for credit losses: Ending Balance | 8,876 |  | 8,166 |  | 8,876 |  | 8,166 |  |  | 5,811
Loans receivables: Ending balance: individually evaluated | 4,993 |  | 6,277 |  | 4,993 |  | 6,277 |  |  | 6,015
Loans receivables: Ending balance: collectively evaluated | 267,415 |  | 262,977 |  | 267,415 |  | 262,977 |  |  | 263,259
Total Gross Loans | 272,408 |  | 269,254 |  | 272,408 |  | 269,254 |  |  | 269,274
Business Express [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 6,444 |  | 2,485 |  | 4,542 |  | 872 |  |  | 872
Allowance for credit losses: Charge-offs | (3,471) |  | (515) |  | (5,387) |  | (554) |  |  | (805)
Allowance for credit losses: Recoveries | 1 |  |  |  | 9 |  |  |  |  | 11
Provision (benefit) for credit losses | 4,168 |  | (485) |  | 7,978 |  | 1,483 |  |  | 4,780
Allowance for credit losses: Ending balance: individually evaluated | 3,052 |  | 250 |  | 3,052 |  | 250 |  |  | 797
Allowance for credit losses: Ending balance: collectively evaluated | 4,090 |  | 1,235 |  | 4,090 |  | 1,235 |  |  | 3,745
Allowance for credit losses: Ending Balance | 7,142 |  | 1,485 |  | 7,142 |  | 1,485 |  |  | 4,542
Loans receivables: Ending balance: individually evaluated | 3,052 |  | 250 |  | 3,052 |  | 250 |  |  | 797
Loans receivables: Ending balance: collectively evaluated | 95,905 |  | 101,008 |  | 95,905 |  | 101,008 |  |  | 102,131
Total Gross Loans | 98,957 |  | 101,258 |  | 98,957 |  | 101,258 |  |  | 102,928
Home Equity [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 635 |  | 722 |  | 691 |  | 485 |  |  | 485
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  | 16 |  |  | 16
Provision (benefit) for credit losses | 10 |  | (54) |  | (46) |  | (15) |  |  | 8
Allowance for credit losses: Ending balance: individually evaluated |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 645 |  | 668 |  | 645 |  | 668 |  |  | 691
Allowance for credit losses: Ending Balance | 645 |  | 668 |  | 645 |  | 668 |  |  | 691
Loans receivables: Ending balance: individually evaluated | 293 |  | 212 |  | 293 |  | 212 |  |  | 212
Loans receivables: Ending balance: collectively evaluated | 67,273 |  | 65,834 |  | 67,273 |  | 65,834 |  |  | 66,119
Total Gross Loans | 67,566 |  | 66,046 |  | 67,566 |  | 66,046 |  |  | 66,331
Consumer [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 23 |  | 31 |  | 78 |  | 24 |  |  | 24
Allowance for credit losses: Charge-offs |  |  |  |  | (446) |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  |  |  |  |
Provision (benefit) for credit losses | 18 |  | 7 |  | 409 |  | 7 |  |  | 47
Allowance for credit losses: Ending balance: individually evaluated | 20 |  |  |  | 20 |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 21 |  | 38 |  | 21 |  | 38 |  |  | 78
Allowance for credit losses: Ending Balance | 41 |  | 38 |  | 41 |  | 38 |  |  | 78
Loans receivables: Ending balance: individually evaluated | 20 |  |  |  | 20 |  |  |  |  |
Loans receivables: Ending balance: collectively evaluated | 2,289 |  | 3,647 |  | 2,289 |  | 3,647 |  |  | 3,643
Total Gross Loans | $ 2,309 |  | $ 3,647 |  | $ 2,309 |  | 3,647 |  |  | 3,643
Unallocated [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 180 |  |  | 180
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | (4,165) |  |  | (4,165)
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 144 |  |  | 144
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Commercial & Multi-family [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | (7,123) |  |  | (7,123)
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Construction [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 1,387 |  |  | 1,387
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Commercial Business [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 1,734 |  |  | 1,734
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Business Express [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | (316) |  |  | (316)
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Home Equity [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 182 |  |  | 182
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Consumer [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 7 |  |  | 7
Effect of Adopting ASU No. 2016-13 ("CECL") [Member] | Unallocated [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | (180) |  |  | (180)
Adjusted Balance [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 28,208 |  |  | 28,208
Adjusted Balance [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 2,618 |  |  | 2,618
Adjusted Balance [Member] | Commercial & Multi-family [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 14,626 |  |  | 14,626
Adjusted Balance [Member] | Construction [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 3,481 |  |  | 3,481
Adjusted Balance [Member] | Commercial Business [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 6,229 |  |  | 6,229
Adjusted Balance [Member] | Business Express [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 556 |  |  | 556
Adjusted Balance [Member] | Home Equity [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | 667 |  |  | 667
Adjusted Balance [Member] | Consumer [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance |  |  |  |  |  |  | $ 31 |  |  | $ 31
[1] | The Company adopted ASU 2016-13 as of January 1, 2023. Prior year periods have not been restated.

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