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

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