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Loans, Allowance for Credit Losses and Credit Quality - Summary of Loans by Risk Rating (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Financing Receivable Impaired [Line Items] |  |  |
Total Loans | $ 1,186,929 |  | $ 1,145,835
Current-period gross writeoffs |  |  |
Total current-period gross writeoffs | 82 | $ 0 |
Real Estate Loans | Home Equity Lines of Credit and Loans |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 90 |  | 375
2024 | 373 |  | 705
2023 | 696 |  | 27
2022 | 26 |  | 7
2021 | 6 |  | 0
Prior | 73 |  | 81
Revolving loans amortized cost basis | 41,927 |  | 43,122
Revolving loans converted to term loans | 841 |  | 837
Total Loans | 44,032 |  | 45,154
Current-period gross writeoffs |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total current-period gross writeoffs | 0 | 0 | 0
Real Estate Loans | Home Equity Lines of Credit and Loans | Pass |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 199
2024 | 198 |  | 323
2023 | 321 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 6,370 |  | 8,083
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 6,889 |  | 8,605
Real Estate Loans | Home Equity Lines of Credit and Loans | Special Mention |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 6 |  | 10
Revolving loans amortized cost basis | 297 |  | 322
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 303 |  | 332
Real Estate Loans | Home Equity Lines of Credit and Loans | Substandard |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 99 |  | 99
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 99 |  | 99
Real Estate Loans | Home Equity Lines of Credit and Loans | Doubtful |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Home Equity Lines of Credit and Loans | Loans Not Formally Rated |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 90 |  | 176
2024 | 175 |  | 382
2023 | 375 |  | 27
2022 | 26 |  | 7
2021 | 6 |  | 0
Prior | 67 |  | 71
Revolving loans amortized cost basis | 35,161 |  | 34,618
Revolving loans converted to term loans | 841 |  | 837
Total Loans | 36,741 |  | 36,118
Real Estate Loans | One- to Four-Family Residential |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 15,160 |  | 39,256
2024 | 38,700 |  | 58,556
2023 | 61,619 |  | 118,711
2022 | 116,599 |  | 83,941
2021 | 83,270 |  | 53,343
Prior | 119,023 |  | 69,034
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 434,371 |  | 422,841
Current-period gross writeoffs |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total current-period gross writeoffs | 0 | 0 | 0
Real Estate Loans | One- to Four-Family Residential | Pass |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 5,059 |  | 8,351
2024 | 8,874 |  | 12,065
2023 | 14,022 |  | 34,466
2022 | 34,310 |  | 15,123
2021 | 15,014 |  | 3,979
Prior | 15,380 |  | 11,766
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 92,659 |  | 85,750
Real Estate Loans | One- to Four-Family Residential | Special Mention |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 523 |  | 0
2022 | 0 |  | 0
2021 | 371 |  | 636
Prior | 495 |  | 771
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 1,389 |  | 1,407
Real Estate Loans | One- to Four-Family Residential | Substandard |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | One- to Four-Family Residential | Doubtful |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | One- to Four-Family Residential | Loans Not Formally Rated |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 10,101 |  | 30,905
2024 | 29,826 |  | 46,491
2023 | 47,074 |  | 84,245
2022 | 82,289 |  | 68,818
2021 | 67,885 |  | 48,728
Prior | 103,148 |  | 56,497
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 340,323 |  | 335,684
Real Estate Loans | Multi Family |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 21,403 |  | 24,006
2024 | 24,918 |  | 55,612
2023 | 57,090 |  | 201,562
2022 | 205,573 |  | 35,315
2021 | 35,081 |  | 8,611
Prior | 17,246 |  | 8,792
Revolving loans amortized cost basis | 9,703 |  | 10,072
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 371,014 |  | 343,970
Current-period gross writeoffs |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total current-period gross writeoffs | 0 | 0 | 0
Real Estate Loans | Multi Family | Pass |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 21,403 |  | 24,006
2024 | 24,918 |  | 55,612
2023 | 57,090 |  | 201,562
2022 | 205,573 |  | 35,315
2021 | 35,081 |  | 8,611
Prior | 17,246 |  | 8,792
Revolving loans amortized cost basis | 9,703 |  | 10,072
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 371,014 |  | 343,970
Real Estate Loans | Multi Family | Special Mention |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Multi Family | Substandard |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Multi Family | Doubtful |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Multi Family | Loans Not Formally Rated |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Commercial Real Estate Loans |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 12,918 |  | 28,614
2024 | 28,514 |  | 40,935
2023 | 38,761 |  | 82,054
2022 | 98,669 |  | 25,215
2021 | 25,030 |  | 15,447
Prior | 46,010 |  | 32,071
Revolving loans amortized cost basis | 5,164 |  | 4,655
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 255,066 |  | 228,991
Current-period gross writeoffs |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total current-period gross writeoffs | 0 | 0 | 0
Real Estate Loans | Commercial Real Estate Loans | Pass |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 12,918 |  | 28,614
2024 | 28,514 |  | 40,935
2023 | 38,761 |  | 82,054
2022 | 98,669 |  | 25,215
2021 | 25,030 |  | 15,447
Prior | 46,010 |  | 32,071
Revolving loans amortized cost basis | 5,164 |  | 4,655
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 255,066 |  | 228,991
Real Estate Loans | Commercial Real Estate Loans | Special Mention |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Commercial Real Estate Loans | Substandard |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Commercial Real Estate Loans | Doubtful |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Commercial Real Estate Loans | Loans Not Formally Rated |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Construction |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 4,345 |  | 32,102
2024 | 35,506 |  | 20,828
2023 | 13,867 |  | 32,483
2022 | 11,623 |  | 2,493
2021 | 1,355 |  | 0
Prior | 2,988 |  | 2,988
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 69,684 |  | 90,894
Current-period gross writeoffs |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total current-period gross writeoffs | 0 | 0 | 0
Real Estate Loans | Construction | Pass |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 3,644 |  | 30,986
2024 | 34,215 |  | 19,398
2023 | 13,419 |  | 32,483
2022 | 11,623 |  | 2,493
2021 | 1,355 |  | 0
Prior | 2,988 |  | 2,988
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 67,244 |  | 88,348
Real Estate Loans | Construction | Special Mention |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Construction | Substandard |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Construction | Doubtful |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Real Estate Loans | Construction | Loans Not Formally Rated |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 701 |  | 1,116
2024 | 1,291 |  | 1,430
2023 | 448 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 2,440 |  | 2,546
Real Estate Loans | Commercial Loans |  |  |
Financing Receivable Impaired [Line Items] |  |  |
Total Loans |  |  | 228,991
Other Loans | Commercial Loans |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 4,501
2024 | 4,501 |  | 4,410
2023 | 4,401 |  | 2,597
2022 | 2,453 |  | 340
2021 | 301 |  | 0
Prior | 172 |  | 195
Revolving loans amortized cost basis | 725 |  | 1,801
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 12,553 |  | 13,844
Current-period gross writeoffs |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 16 |  | 0
Revolving loans amortized cost basis | 65 |  | 0
Revolving loans converted to term | 0 |  | 0
Total current-period gross writeoffs | 81 | 0 | 0
Other Loans | Commercial Loans | Pass |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 4,501
2024 | 4,501 |  | 4,410
2023 | 4,401 |  | 2,597
2022 | 2,453 |  | 340
2021 | 301 |  | 0
Prior | 172 |  | 195
Revolving loans amortized cost basis | 725 |  | 1,801
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 12,553 |  | 13,844
Other Loans | Commercial Loans | Special Mention |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Commercial Loans | Substandard |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Commercial Loans | Doubtful |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Commercial Loans | Loans Not Formally Rated |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Consumer |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 78 |  | 7
2024 | 7 |  | 16
2023 | 14 |  | 29
2022 | 27 |  | 39
2021 | 37 |  | 0
Prior | 5 |  | 6
Revolving loans amortized cost basis | 41 |  | 44
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 209 |  | 141
Current-period gross writeoffs |  |  |
2025 | 1 |  | 4
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term | 0 |  | 0
Total current-period gross writeoffs | 1 | $ 0 | 4
Other Loans | Consumer | Pass |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Consumer | Special Mention |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Consumer | Substandard |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Consumer | Doubtful |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 0 |  | 0
2024 | 0 |  | 0
2023 | 0 |  | 0
2022 | 0 |  | 0
2021 | 0 |  | 0
Prior | 0 |  | 0
Revolving loans amortized cost basis | 0 |  | 0
Revolving loans converted to term loans | 0 |  | 0
Total Loans | 0 |  | 0
Other Loans | Consumer | Loans Not Formally Rated |  |  |
Financing Receivable Impaired [Line Items] |  |  |
2025 | 78 |  | 7
2024 | 7 |  | 16
2023 | 14 |  | 29
2022 | 27 |  | 39
2021 | 37 |  | 0
Prior | 5 |  | 6
Revolving loans amortized cost basis | 41 |  | 44
Revolving loans converted to term loans | 0 |  | 0
Total Loans | $ 209 |  | $ 141

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