Loans, Allowance for Credit Losses and Credit Quality - Summary of Loans by Risk Rating (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	Dec. 31, 2023
Financing Receivable Impaired [Line Items]
Total Loans	$ 1,112,316		$ 1,112,316		$ 1,048,606
Current-period gross writeoffs
Total current-period gross writeoffs	3	$ 0	3	$ 0
Real Estate Loans | Home Equity Lines of Credit and Loans
Financing Receivable Impaired [Line Items]
2024	327		327		736
2023	723		723		36
2022	34		34		12
2021	9		9		0
2020	0		0		65
Prior	91		91		36
Revolving loans amortized cost basis	36,270		36,270		31,964
Revolving loans converted to term loans	563		563		508
Total Loans	38,017		38,017		33,357
Current-period gross writeoffs
2024			0		0
2023			0		0
2022			0		0
2021			0		0
2020			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	0	0
Real Estate Loans | Home Equity Lines of Credit and Loans | Pass
Financing Receivable Impaired [Line Items]
2024	200		200		326
2023	325		325		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	5,857		5,857		4,986
Revolving loans converted to term loans	0		0		0
Total Loans	6,382		6,382		5,312
Real Estate Loans | Home Equity Lines of Credit and Loans | Special Mention
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	12		12		14
Revolving loans amortized cost basis	8		8		8
Revolving loans converted to term loans	0		0		0
Total Loans	20		20		22
Real Estate Loans | Home Equity Lines of Credit and Loans | Substandard
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	99		99		0
Revolving loans converted to term loans	0		0		0
Total Loans	99		99		0
Real Estate Loans | Home Equity Lines of Credit and Loans | Doubtful
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Home Equity Lines of Credit and Loans | Loans Not Formally Rated
Financing Receivable Impaired [Line Items]
2024	127		127		410
2023	398		398		36
2022	34		34		12
2021	9		9		0
2020	0		0		65
Prior	79		79		22
Revolving loans amortized cost basis	30,306		30,306		26,970
Revolving loans converted to term loans	563		563		508
Total Loans	31,516		31,516		28,023
Real Estate Loans | One- to Four-Family Residential
Financing Receivable Impaired [Line Items]
2024	18,348		18,348		58,377
2023	58,349		58,349		127,489
2022	123,947		123,947		87,992
2021	86,558		86,558		56,320
2020	55,446		55,446		11,359
Prior	75,623		75,623		68,594
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	418,271		418,271		410,131
Current-period gross writeoffs
2024			0		0
2023			0		0
2022			0		0
2021			0		0
2020			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	0	0
Real Estate Loans | One- to Four-Family Residential | Pass
Financing Receivable Impaired [Line Items]
2024	2,455		2,455		9,689
2023	10,326		10,326		36,662
2022	37,190		37,190		15,529
2021	15,328		15,328		4,476
2020	4,395		4,395		4,230
Prior	12,423		12,423		9,224
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	82,117		82,117		79,810
Real Estate Loans | One- to Four-Family Residential | Special Mention
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		809
2020	796		796		0
Prior	443		443		451
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	1,239		1,239		1,260
Real Estate Loans | One- to Four-Family Residential | Substandard
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | One- to Four-Family Residential | Doubtful
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | One- to Four-Family Residential | Loans Not Formally Rated
Financing Receivable Impaired [Line Items]
2024	15,893		15,893		48,688
2023	48,023		48,023		90,827
2022	86,757		86,757		72,463
2021	71,230		71,230		51,035
2020	50,255		50,255		7,129
Prior	62,757		62,757		58,919
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	334,915		334,915		329,061
Real Estate Loans | Multi Family
Financing Receivable Impaired [Line Items]
2024	10,396		10,396		45,188
2023	48,687		48,687		194,999
2022	199,166		199,166		26,820
2021	36,370		36,370		8,873
2020	8,751		8,751		0
Prior	8,954		8,954		9,798
Revolving loans amortized cost basis	3,846		3,846		1,683
Revolving loans converted to term loans	0		0		0
Total Loans	316,170		316,170		287,361
Current-period gross writeoffs
2024			0		0
2023			0		0
2022			0		0
2021			0		0
2020			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	0	0
Real Estate Loans | Multi Family | Pass
Financing Receivable Impaired [Line Items]
2024	10,396		10,396		45,188
2023	48,687		48,687		194,999
2022	199,166		199,166		26,820
2021	36,370		36,370		8,873
2020	8,751		8,751		0
Prior	8,954		8,954		9,798
Revolving loans amortized cost basis	3,846		3,846		1,683
Revolving loans converted to term loans	0		0		0
Total Loans	316,170		316,170		287,361
Real Estate Loans | Multi Family | Special Mention
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Multi Family | Substandard
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Multi Family | Doubtful
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Multi Family | Loans Not Formally Rated
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Commercial Real Estate Loans
Financing Receivable Impaired [Line Items]
2024	18,058		18,058		43,639
2023	39,467		39,467		72,671
2022	72,209		72,209		24,138
2021	26,003		26,003		16,407
2020	15,729		15,729		4,054
Prior	33,145		33,145		31,132
Revolving loans amortized cost basis	6,337		6,337		4,324
Revolving loans converted to term loans	0		0		0
Total Loans	210,948		210,948		196,365
Current-period gross writeoffs
2024			0		0
2023			0		0
2022			0		0
2021			0		0
2020			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	0	0
Real Estate Loans | Commercial Real Estate Loans | Pass
Financing Receivable Impaired [Line Items]
2024	18,058		18,058		43,639
2023	39,467		39,467		72,671
2022	72,209		72,209		24,138
2021	26,003		26,003		16,407
2020	15,729		15,729		4,054
Prior	33,145		33,145		31,132
Revolving loans amortized cost basis	6,337		6,337		4,324
Revolving loans converted to term loans	0		0		0
Total Loans	210,948		210,948		196,365
Real Estate Loans | Commercial Real Estate Loans | Special Mention
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Commercial Real Estate Loans | Substandard
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Commercial Real Estate Loans | Doubtful
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Commercial Real Estate Loans | Loans Not Formally Rated
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Construction
Financing Receivable Impaired [Line Items]
2024	14,594		14,594		35,828
2023	41,357		41,357		55,170
2022	51,316		51,316		17,228
2021	4,328		4,328		0
2020	0		0		786
Prior	2,988		2,988		2,988
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	114,583		114,583		112,000
Current-period gross writeoffs
2024			0		0
2023			0		0
2022			0		0
2021			0		0
2020			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	0	0
Real Estate Loans | Construction | Pass
Financing Receivable Impaired [Line Items]
2024	14,244		14,244		33,707
2023	38,477		38,477		55,170
2022	51,316		51,316		17,228
2021	4,328		4,328		0
2020	0		0		786
Prior	2,988		2,988		2,988
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	111,353		111,353		109,879
Real Estate Loans | Construction | Special Mention
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Construction | Substandard
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Construction | Doubtful
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Real Estate Loans | Construction | Loans Not Formally Rated
Financing Receivable Impaired [Line Items]
2024	350		350		2,121
2023	2,880		2,880		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	3,230		3,230		2,121
Other Loans | Commercial
Financing Receivable Impaired [Line Items]
2024	4,500		4,500		4,444
2023	4,428		4,428		3,349
2022	2,917		2,917		493
2021	422		422		35
2020	25		25		89
Prior	206		206		154
Revolving loans amortized cost basis	1,686		1,686		655
Revolving loans converted to term loans	0		0		0
Total Loans	14,184		14,184		9,219
Current-period gross writeoffs
2024			0		0
2023			0		0
2022			0		0
2021			0		0
2020			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	0	0
Other Loans | Commercial | Pass
Financing Receivable Impaired [Line Items]
2024	4,500		4,500		4,444
2023	4,428		4,428		3,349
2022	2,917		2,917		428
2021	422		422		35
2020	25		25		89
Prior	206		206		154
Revolving loans amortized cost basis	1,686		1,686		655
Revolving loans converted to term loans	0		0		0
Total Loans	14,184		14,184		9,154
Other Loans | Commercial | Special Mention
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Other Loans | Commercial | Substandard
Financing Receivable Impaired [Line Items]
2024					0
2023					0
2022					0
2021					0
2020					0
Prior					0
Revolving loans amortized cost basis					0
Revolving loans converted to term loans					0
Total Loans					0
Other Loans | Commercial | Doubtful
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Other Loans | Commercial | Loans Not Formally Rated
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		65
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		65
Other Loans | Consumer
Financing Receivable Impaired [Line Items]
2024	0		0		31
2023	19		19		38
2022	33		33		45
2021	43		43		0
2020	0		0		0
Prior	10		10		13
Revolving loans amortized cost basis	38		38		46
Revolving loans converted to term loans	0		0		0
Total Loans	143		143		173
Current-period gross writeoffs
2024			3		2
2023			0		0
2022			0		0
2021			0		0
2020			0		0
Prior			0		0
Revolving loans amortized cost basis			0		0
Revolving loans converted to term			0		0
Total current-period gross writeoffs	3	$ 0	3	$ 0	2
Other Loans | Consumer | Pass
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Other Loans | Consumer | Special Mention
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Other Loans | Consumer | Substandard
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Other Loans | Consumer | Doubtful
Financing Receivable Impaired [Line Items]
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	0		0		0
Other Loans | Consumer | Loans Not Formally Rated
Financing Receivable Impaired [Line Items]
2024	0		0		31
2023	19		19		38
2022	33		33		45
2021	43		43		0
2020	0		0		0
Prior	10		10		13
Revolving loans amortized cost basis	38		38		46
Revolving loans converted to term loans	0		0		0
Total Loans	$ 143		$ 143		$ 173