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Loans Receivable and Allowance for Credit Losses (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | [1] | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | $ 33,608 |  | $ 32,373 |  |  | $ 32,373
Allowance for credit losses: Charge-offs | (1,151) |  | (1) |  |  | (805)
Allowance for credit losses: Recoveries | 18 |  | 53 |  |  | 101
Provision (benefit) for credit losses | 2,088 | [1] | 622 | [1] | $ (2,575) | 6,104
Allowance for credit losses: Ending balance: individually evaluated | 5,516 |  | 2,586 |  |  | 4,229
Allowance for credit losses: Ending balance: collectively evaluated | 29,047 |  | 26,296 |  |  | 29,379
Allowance for credit losses: Ending Balance | 34,563 |  | 28,882 |  |  | 33,608
Loans receivables: Ending balance: individually evaluated | 65,731 |  | 17,584 |  |  | 54,019
Loans receivables: Ending balance: collectively evaluated | 3,199,414 |  | 3,248,387 |  |  | 3,263,383
Total Gross Loans | 3,265,145 |  | 3,265,971 |  |  | 3,317,402
Residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 2,344 |  | 2,474 |  |  | 2,474
Allowance for credit losses: Charge-offs |  |  |  |  |  |
Allowance for credit losses: Recoveries | 11 |  | 12 |  |  | 45
Provision (benefit) for credit losses | (192) |  | (269) |  |  | (319)
Allowance for credit losses: Ending balance: individually evaluated |  |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 2,163 |  | 2,361 |  |  | 2,344
Allowance for credit losses: Ending Balance | 2,163 |  | 2,361 |  |  | 2,344
Loans receivables: Ending balance: individually evaluated | 173 |  | 358 |  |  | 444
Loans receivables: Ending balance: collectively evaluated | 244,589 |  | 246,325 |  |  | 247,851
Total Gross Loans | 244,762 |  | 246,683 |  |  | 248,295
Commercial & Multi-family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 16,301 |  | 21,749 |  |  | 21,749
Allowance for credit losses: Charge-offs |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |
Provision (benefit) for credit losses | (938) |  | 340 |  |  | 1,675
Allowance for credit losses: Ending balance: individually evaluated | 956 |  |  |  |  | 990
Allowance for credit losses: Ending balance: collectively evaluated | 14,407 |  | 14,966 |  |  | 15,311
Allowance for credit losses: Ending Balance | 15,363 |  | 14,966 |  |  | 16,301
Loans receivables: Ending balance: individually evaluated | 52,572 |  | 10,114 |  |  | 42,259
Loans receivables: Ending balance: collectively evaluated | 2,340,398 |  | 2,456,818 |  |  | 2,391,856
Total Gross Loans | 2,392,970 |  | 2,466,932 |  |  | 2,434,115
Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 3,841 |  | 2,094 |  |  | 2,094
Allowance for credit losses: Charge-offs |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |
Provision (benefit) for credit losses | (604) |  | 369 |  |  | 360
Allowance for credit losses: Ending balance: individually evaluated | 203 |  | 605 |  |  | 310
Allowance for credit losses: Ending balance: collectively evaluated | 3,034 |  | 3,245 |  |  | 3,531
Allowance for credit losses: Ending Balance | 3,237 |  | 3,850 |  |  | 3,841
Loans receivables: Ending balance: individually evaluated | 3,802 |  | 3,217 |  |  | 4,292
Loans receivables: Ending balance: collectively evaluated | 177,173 |  | 159,336 |  |  | 188,524
Total Gross Loans | 180,975 |  | 162,553 |  |  | 192,816
Commercial Business [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 5,811 |  | 4,495 |  |  | 4,495
Allowance for credit losses: Charge-offs | (29) |  | (1) |  |  |
Allowance for credit losses: Recoveries | 3 |  | 25 |  |  | 29
Provision (benefit) for credit losses | 1,855 |  | (780) |  |  | (447)
Allowance for credit losses: Ending balance: individually evaluated | 3,291 |  | 1,942 |  |  | 2,132
Allowance for credit losses: Ending balance: collectively evaluated | 4,349 |  | 3,531 |  |  | 3,679
Allowance for credit losses: Ending Balance | 7,640 |  | 5,473 |  |  | 5,811
Loans receivables: Ending balance: individually evaluated | 8,315 |  | 3,644 |  |  | 6,015
Loans receivables: Ending balance: collectively evaluated | 268,549 |  | 238,349 |  |  | 263,259
Total Gross Loans | 276,864 |  | 241,993 |  |  | 269,274
Business Express [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 4,542 |  | 872 |  |  | 872
Allowance for credit losses: Charge-offs | (1,122) |  |  |  |  | (805)
Allowance for credit losses: Recoveries | 4 |  |  |  |  | 11
Provision (benefit) for credit losses | 1,606 |  | 962 |  |  | 4,780
Allowance for credit losses: Ending balance: individually evaluated | 657 |  | 39 |  |  | 797
Allowance for credit losses: Ending balance: collectively evaluated | 4,373 |  | 1,479 |  |  | 3,745
Allowance for credit losses: Ending Balance | 5,030 |  | 1,518 |  |  | 4,542
Loans receivables: Ending balance: individually evaluated | 657 |  | 39 |  |  | 797
Loans receivables: Ending balance: collectively evaluated | 100,552 |  | 85,566 |  |  | 102,131
Total Gross Loans | 101,209 |  | 85,605 |  |  | 102,928
Home Equity [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 691 |  | 485 |  |  | 485
Allowance for credit losses: Charge-offs |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  | 16 |  |  | 16
Provision (benefit) for credit losses | (41) |  | (3) |  |  | 8
Allowance for credit losses: Ending balance: individually evaluated |  |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 650 |  | 680 |  |  | 691
Allowance for credit losses: Ending Balance | 650 |  | 680 |  |  | 691
Loans receivables: Ending balance: individually evaluated | 212 |  | 212 |  |  | 212
Loans receivables: Ending balance: collectively evaluated | 65,306 |  | 58,610 |  |  | 66,119
Total Gross Loans | 65,518 |  | 58,822 |  |  | 66,331
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses: Beginning Balance | 78 |  | 24 |  |  | 24
Allowance for credit losses: Charge-offs |  |  |  |  |  |
Allowance for credit losses: Recoveries |  |  |  |  |  |
Provision (benefit) for credit losses | 402 |  | 3 |  |  | 47
Allowance for credit losses: Ending balance: individually evaluated | 409 |  |  |  |  |
Allowance for credit losses: Ending balance: collectively evaluated | 71 |  | 34 |  |  | 78
Allowance for credit losses: Ending Balance | 480 |  | 34 |  |  | 78
Loans receivables: Ending balance: individually evaluated |  |  |  |  |  |
Loans receivables: Ending balance: collectively evaluated | 2,847 |  | 3,383 |  |  | 3,643
Total Gross Loans | $ 2,847 |  | 3,383 |  |  | 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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