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Loans Receivable and Allowance for Credit Losses (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | [1] | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | $ 34,563 |  | $ 28,882 |  | $ 33,608 |  | $ 32,373 |  |  | $ 32,373
Allowance for credit losses: Charge-offs | (1,778) |  | (39) |  | (2,929) |  | (40) |  |  | (805)
Allowance for credit losses: Recoveries | 20 |  | 12 |  | 38 |  | 65 |  |  | 101
Provision (benefit) for credit losses | 2,438 | [1] | 1,350 | [1] | 4,526 | [1] | 1,972 | [1] | $ (2,575) | 6,104
Allowance for credit losses: Ending balance: individually evaluated | 6,333 |  | 2,772 |  | 6,333 |  | 2,772 |  |  | 4,229
Allowance for credit losses: Ending balance: collectively evaluated | 28,910 |  | 27,433 |  | 28,910 |  | 27,433 |  |  | 29,379
Allowance for credit losses: Ending Balance | 35,243 |  | 30,205 |  | 35,243 |  | 30,205 |  |  | 33,608
Loans receivables: Ending balance: individually evaluated | 60,798 |  | 28,249 |  | 60,798 |  | 28,249 |  |  | 54,019
Loans receivables: Ending balance: collectively evaluated | 3,139,751 |  | 3,326,672 |  | 3,139,751 |  | 3,326,672 |  |  | 3,263,383
Total Gross Loans | 3,200,549 |  | 3,354,921 |  | 3,200,549 |  | 3,354,921 |  |  | 3,317,402
Residential [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 2,163 |  | 2,361 |  | 2,344 |  | 2,474 |  |  | 2,474
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries | 14 |  | 12 |  | 25 |  | 24 |  |  | 45
Provision (benefit) for credit losses | (138) |  | 80 |  | (330) |  | (189) |  |  | (319)
Allowance for credit losses: Ending balance: individually evaluated |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 2,039 |  | 2,453 |  | 2,039 |  | 2,453 |  |  | 2,344
Allowance for credit losses: Ending Balance | 2,039 |  | 2,453 |  | 2,039 |  | 2,453 |  |  | 2,344
Loans receivables: Ending balance: individually evaluated | 173 |  | 356 |  | 173 |  | 356 |  |  | 444
Loans receivables: Ending balance: collectively evaluated | 242,533 |  | 249,989 |  | 242,533 |  | 249,989 |  |  | 247,851
Total Gross Loans | 242,706 |  | 250,345 |  | 242,706 |  | 250,345 |  |  | 248,295
Commercial & Multi-family [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 15,363 |  | 14,966 |  | 16,301 |  | 21,749 |  |  | 21,749
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  |  |  |  |
Provision (benefit) for credit losses | (456) |  | 79 |  | (1,394) |  | 419 |  |  | 1,675
Allowance for credit losses: Ending balance: individually evaluated | 970 |  |  |  | 970 |  |  |  |  | 990
Allowance for credit losses: Ending balance: collectively evaluated | 13,937 |  | 15,045 |  | 13,937 |  | 15,045 |  |  | 15,311
Allowance for credit losses: Ending Balance | 14,907 |  | 15,045 |  | 14,907 |  | 15,045 |  |  | 16,301
Loans receivables: Ending balance: individually evaluated | 51,089 |  | 17,108 |  | 51,089 |  | 17,108 |  |  | 42,259
Loans receivables: Ending balance: collectively evaluated | 2,289,296 |  | 2,473,775 |  | 2,289,296 |  | 2,473,775 |  |  | 2,391,856
Total Gross Loans | 2,340,385 |  | 2,490,883 |  | 2,340,385 |  | 2,490,883 |  |  | 2,434,115
Construction [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 3,237 |  | 3,850 |  | 3,841 |  | 2,094 |  |  | 2,094
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  |  |  |  |
Provision (benefit) for credit losses | (365) |  | 240 |  | (969) |  | 609 |  |  | 360
Allowance for credit losses: Ending balance: individually evaluated |  |  | 608 |  |  |  | 608 |  |  | 310
Allowance for credit losses: Ending balance: collectively evaluated | 2,872 |  | 3,482 |  | 2,872 |  | 3,482 |  |  | 3,531
Allowance for credit losses: Ending Balance | 2,872 |  | 4,090 |  | 2,872 |  | 4,090 |  |  | 3,841
Loans receivables: Ending balance: individually evaluated | 1,164 |  | 5,604 |  | 1,164 |  | 5,604 |  |  | 4,292
Loans receivables: Ending balance: collectively evaluated | 172,043 |  | 173,552 |  | 172,043 |  | 173,552 |  |  | 188,524
Total Gross Loans | 173,207 |  | 179,156 |  | 173,207 |  | 179,156 |  |  | 192,816
Commercial Business [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 7,640 |  | 5,473 |  | 5,811 |  | 4,495 |  |  | 4,495
Allowance for credit losses: Charge-offs | (538) |  |  |  | (567) |  | (1) |  |  |
Allowance for credit losses: Recoveries | 2 |  |  |  | 5 |  | 25 |  |  | 29
Provision (benefit) for credit losses | 1,219 |  | (94) |  | 3,074 |  | (874) |  |  | (447)
Allowance for credit losses: Ending balance: individually evaluated | 3,338 |  | 1,898 |  | 3,338 |  | 1,898 |  |  | 2,132
Allowance for credit losses: Ending balance: collectively evaluated | 4,985 |  | 3,481 |  | 4,985 |  | 3,481 |  |  | 3,679
Allowance for credit losses: Ending Balance | 8,323 |  | 5,379 |  | 8,323 |  | 5,379 |  |  | 5,811
Loans receivables: Ending balance: individually evaluated | 6,135 |  | 4,703 |  | 6,135 |  | 4,703 |  |  | 6,015
Loans receivables: Ending balance: collectively evaluated | 268,771 |  | 267,898 |  | 268,771 |  | 267,898 |  |  | 263,259
Total Gross Loans | 274,906 |  | 272,601 |  | 274,906 |  | 272,601 |  |  | 269,274
Business Express [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 5,030 |  | 1,518 |  | 4,542 |  | 872 |  |  | 872
Allowance for credit losses: Charge-offs | (794) |  | (39) |  | (1,916) |  | (39) |  |  | (805)
Allowance for credit losses: Recoveries | 4 |  |  |  | 8 |  |  |  |  | 11
Provision (benefit) for credit losses | 2,204 |  | 1,006 |  | 3,810 |  | 1,968 |  |  | 4,780
Allowance for credit losses: Ending balance: individually evaluated | 2,025 |  | 266 |  | 2,025 |  | 266 |  |  | 797
Allowance for credit losses: Ending balance: collectively evaluated | 4,419 |  | 2,219 |  | 4,419 |  | 2,219 |  |  | 3,745
Allowance for credit losses: Ending Balance | 6,444 |  | 2,485 |  | 6,444 |  | 2,485 |  |  | 4,542
Loans receivables: Ending balance: individually evaluated | 2,025 |  | 266 |  | 2,025 |  | 266 |  |  | 797
Loans receivables: Ending balance: collectively evaluated | 98,424 |  | 96,081 |  | 98,424 |  | 96,081 |  |  | 102,131
Total Gross Loans | 100,449 |  | 96,347 |  | 100,449 |  | 96,347 |  |  | 102,928
Home Equity [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 650 |  | 680 |  | 691 |  | 485 |  |  | 485
Allowance for credit losses: Charge-offs |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  | 16 |  |  | 16
Provision (benefit) for credit losses | (15) |  | 42 |  | (56) |  | 39 |  |  | 8
Allowance for credit losses: Ending balance: individually evaluated |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 635 |  | 722 |  | 635 |  | 722 |  |  | 691
Allowance for credit losses: Ending Balance | 635 |  | 722 |  | 635 |  | 722 |  |  | 691
Loans receivables: Ending balance: individually evaluated | 212 |  | 212 |  | 212 |  | 212 |  |  | 212
Loans receivables: Ending balance: collectively evaluated | 66,631 |  | 61,383 |  | 66,631 |  | 61,383 |  |  | 66,119
Total Gross Loans | 66,843 |  | 61,595 |  | 66,843 |  | 61,595 |  |  | 66,331
Consumer [Member] |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 480 |  | 34 |  | 78 |  | 24 |  |  | 24
Allowance for credit losses: Charge-offs | (446) |  |  |  | (446) |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |  |  |  |  |
Provision (benefit) for credit losses | (11) |  | (3) |  | 391 |  |  |  |  | 47
Allowance for credit losses: Ending balance: individually evaluated |  |  |  |  |  |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 23 |  | 31 |  | 23 |  | 31 |  |  | 78
Allowance for credit losses: Ending Balance | 23 |  | 31 |  | 23 |  | 31 |  |  | 78
Loans receivables: Ending balance: individually evaluated |  |  |  |  |  |  |  |  |  |
Loans receivables: Ending balance: collectively evaluated | 2,053 |  | 3,994 |  | 2,053 |  | 3,994 |  |  | 3,643
Total Gross Loans | $ 2,053 |  | $ 3,994 |  | $ 2,053 |  | 3,994 |  |  | 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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