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Loans Receivable and Allowance for Credit Losses (Loan Portfolio by Pass Rating) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year | $ 2,259 |  | $ 280,851
Total Loans, Fiscal Year Before Latest Fiscal Year | 277,413 |  | 959,372
Total Loans, Two Years Before Latest Fiscal Year | 940,962 |  | 333,030
Total Loans, Three Years Before Latest Fiscal Year | 324,375 |  | 276,923
Total Loans, Four Years Before Latest Fiscal Year | 273,344 |  | 72,067
Total Loans, Prior | 1,065,220 |  | 1,021,468
Total Loans, Revolving Loans | 378,663 |  | 372,776
Total Loans, Revolving Loans to Term Loans | 2,909 |  | 915
Total Gross Loans | 3,265,145 | $ 3,265,971 | 3,317,402
Prior, Gross charge-offs | 29 |  |
Revolving Loans, Gross Charge Writeoff | 1,122 |  | 805
Gross charge offs | 1,151 | 1 | 805
Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year |  |  | 17,080
Total Loans, Fiscal Year Before Latest Fiscal Year | 17,095 |  | 54,115
Total Loans, Two Years Before Latest Fiscal Year | 53,010 |  | 39,579
Total Loans, Three Years Before Latest Fiscal Year | 39,349 |  | 31,420
Total Loans, Four Years Before Latest Fiscal Year | 31,210 |  | 12,067
Total Loans, Prior | 104,098 |  | 94,034
Total Gross Loans | 244,762 | 246,683 | 248,295
Gross charge offs |  |  |
Residential [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year |  |  | 17,080
Total Loans, Fiscal Year Before Latest Fiscal Year | 17,095 |  | 53,623
Total Loans, Two Years Before Latest Fiscal Year | 52,521 |  | 38,178
Total Loans, Three Years Before Latest Fiscal Year | 37,956 |  | 31,420
Total Loans, Four Years Before Latest Fiscal Year | 31,210 |  | 12,067
Total Loans, Prior | 103,842 |  | 93,764
Total Gross Loans | 242,624 |  | 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 | 489 |  | 91
Total Loans, Three Years Before Latest Fiscal Year | 90 |  |
Total Gross Loans | 579 |  | 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 | 1,303 |  |
Total Loans, Prior | 256 |  | 270
Total Gross Loans | 1,559 |  | 1,580
Commercial & Multi-family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year | 1,200 |  | 232,343
Total Loans, Fiscal Year Before Latest Fiscal Year | 226,542 |  | 827,382
Total Loans, Two Years Before Latest Fiscal Year | 813,780 |  | 228,846
Total Loans, Three Years Before Latest Fiscal Year | 228,329 |  | 218,343
Total Loans, Four Years Before Latest Fiscal Year | 217,106 |  | 51,284
Total Loans, Prior | 903,873 |  | 873,855
Total Loans, Revolving Loans | 2,140 |  | 2,062
Total Gross Loans | 2,392,970 | 2,466,932 | 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 | 1,200 |  | 222,435
Total Loans, Fiscal Year Before Latest Fiscal Year | 216,671 |  | 778,076
Total Loans, Two Years Before Latest Fiscal Year | 764,734 |  | 224,823
Total Loans, Three Years Before Latest Fiscal Year | 223,690 |  | 214,768
Total Loans, Four Years Before Latest Fiscal Year | 213,531 |  | 50,755
Total Loans, Prior | 843,449 |  | 824,375
Total Loans, Revolving Loans | 2,000 |  | 1,922
Total Gross Loans | 2,265,275 |  | 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 | 9,871 |  | 34,375
Total Loans, Two Years Before Latest Fiscal Year | 34,181 |  |
Total Loans, Four Years Before Latest Fiscal Year |  |  | 529
Total Loans, Prior | 5,801 |  | 4,453
Total Loans, Revolving Loans | 140 |  | 140
Total Gross Loans | 49,993 |  | 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 | 14,865 |  | 4,023
Total Loans, Three Years Before Latest Fiscal Year | 4,639 |  | 3,575
Total Loans, Four Years Before Latest Fiscal Year | 3,575 |  |
Total Loans, Prior | 54,623 |  | 45,027
Total Gross Loans | 77,702 |  | 67,556
Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year |  |  | 21,730
Total Loans, Fiscal Year Before Latest Fiscal Year | 25,473 |  | 75,574
Total Loans, Two Years Before Latest Fiscal Year | 71,926 |  | 59,564
Total Loans, Three Years Before Latest Fiscal Year | 53,732 |  | 22,048
Total Loans, Four Years Before Latest Fiscal Year | 20,034 |  |
Total Loans, Prior | 4,100 |  | 8,190
Total Loans, Revolving Loans | 5,710 |  | 5,710
Total Gross Loans | 180,975 | 162,553 | 192,816
Gross charge offs |  |  |
Construction [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year |  |  | 21,730
Total Loans, Fiscal Year Before Latest Fiscal Year | 25,473 |  | 74,180
Total Loans, Two Years Before Latest Fiscal Year | 71,926 |  | 59,564
Total Loans, Three Years Before Latest Fiscal Year | 52,767 |  | 21,462
Total Loans, Four Years Before Latest Fiscal Year | 19,448 |  |
Total Loans, Prior | 1,849 |  | 5,878
Total Loans, Revolving Loans | 5,710 |  | 5,710
Total Gross Loans | 177,173 |  | 188,524
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 | 965 |  | 586
Total Loans, Four Years Before Latest Fiscal Year | 586 |  |
Total Loans, Prior | 2,251 |  | 2,312
Total Gross Loans | 3,802 |  | 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 | 3,141 |  | 297
Total Loans, Two Years Before Latest Fiscal Year | 290 |  | 2,967
Total Loans, Three Years Before Latest Fiscal Year | 2,405 |  | 4,234
Total Loans, Four Years Before Latest Fiscal Year | 4,135 |  | 7,397
Total Loans, Prior | 45,906 |  | 39,208
Total Loans, Revolving Loans | 219,036 |  | 211,842
Total Loans, Revolving Loans to Term Loans | 1,951 |  | 150
Total Gross Loans | 276,864 | 241,993 | 269,274
Gross charge offs | 29 | 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 | 3,141 |  | 297
Total Loans, Two Years Before Latest Fiscal Year | 290 |  | 2,967
Total Loans, Three Years Before Latest Fiscal Year | 1,984 |  | 4,234
Total Loans, Four Years Before Latest Fiscal Year | 4,135 |  | 7,080
Total Loans, Prior | 40,198 |  | 33,675
Total Loans, Revolving Loans | 207,677 |  | 201,008
Total Loans, Revolving Loans to Term Loans | 549 |  | 150
Total Gross Loans | 257,974 |  | 252,590
Commercial Business [Member] | Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Three Years Before Latest Fiscal Year | 421 |  |
Total Loans, Four Years Before Latest Fiscal Year |  |  | 317
Total Loans, Prior | 1,063 |  | 830
Total Loans, Revolving Loans | 4,003 |  | 4,410
Total Gross Loans | 5,487 |  | 5,557
Commercial Business [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Prior | 4,645 |  | 4,703
Total Loans, Revolving Loans | 7,356 |  | 6,424
Total Loans, Revolving Loans to Term Loans | 1,402 |  |
Total Gross Loans | 13,403 |  | 11,127
Business Express [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Revolving Loans | 101,209 |  | 102,928
Total Gross Loans | 101,209 | 85,605 | 102,928
Gross charge offs | 1,122 |  | 805
Business Express [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Revolving Loans | 98,604 |  | 101,531
Total Gross Loans | 98,604 |  | 101,531
Business Express [Member] | Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Revolving Loans | 1,703 |  | 600
Total Gross Loans | 1,703 |  | 600
Business Express [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Revolving Loans | 902 |  | 797
Total Gross Loans | 902 |  | 797
Home Equity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year |  |  | 5,022
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,979 |  | 1,533
Total Loans, Two Years Before Latest Fiscal Year | 1,505 |  | 553
Total Loans, Three Years Before Latest Fiscal Year | 541 |  | 769
Total Loans, Four Years Before Latest Fiscal Year | 754 |  | 1,280
Total Loans, Prior | 7,219 |  | 6,181
Total Loans, Revolving Loans | 50,562 |  | 50,228
Total Loans, Revolving Loans to Term Loans | 958 |  | 765
Total Gross Loans | 65,518 | 58,822 | 66,331
Gross charge offs |  |  |
Home Equity [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year |  |  | 5,022
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,979 |  | 1,487
Total Loans, Two Years Before Latest Fiscal Year | 1,461 |  | 553
Total Loans, Three Years Before Latest Fiscal Year | 541 |  | 769
Total Loans, Four Years Before Latest Fiscal Year | 754 |  | 1,280
Total Loans, Prior | 7,219 |  | 6,181
Total Loans, Revolving Loans | 50,445 |  | 50,111
Total Loans, Revolving Loans to Term Loans | 746 |  | 553
Total Gross Loans | 65,145 |  | 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 | 44 |  |
Total Loans, Revolving Loans | 117 |  | 117
Total Loans, Revolving Loans to Term Loans | 212 |  | 212
Total Gross Loans | 373 |  | 375
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year | 1,059 |  | 1,497
Total Loans, Fiscal Year Before Latest Fiscal Year | 1,183 |  | 471
Total Loans, Two Years Before Latest Fiscal Year | 451 |  | 1,521
Total Loans, Three Years Before Latest Fiscal Year | 19 |  | 109
Total Loans, Four Years Before Latest Fiscal Year | 105 |  | 39
Total Loans, Prior | 24 |  |
Total Loans, Revolving Loans | 6 |  | 6
Total Gross Loans | 2,847 | $ 3,383 | 3,643
Gross charge offs |  |  |
Consumer [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans, Current Fiscal Year | 1,059 |  | 1,497
Total Loans, Fiscal Year Before Latest Fiscal Year | 1,183 |  | 471
Total Loans, Two Years Before Latest Fiscal Year | 451 |  | 1,521
Total Loans, Three Years Before Latest Fiscal Year | 19 |  | 109
Total Loans, Four Years Before Latest Fiscal Year | 105 |  | 39
Total Loans, Prior | 24 |  |
Total Loans, Revolving Loans | 6 |  | 6
Total Gross Loans | $ 2,847 |  | $ 3,643

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