Loans, Allowance for Credit Losses and Credit Quality - Summary of Loans by Risk Rating (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable Impaired [Line Items]
Total Loans	$ 1,124,491		$ 1,124,491		$ 1,048,606
Current-period gross writeoffs
Total current-period gross writeoffs	0	$ 1	3	$ 1
Real Estate Loans \| Home Equity Lines of Credit and Loans
Financing Receivable Impaired [Line Items]
2024	326		326		736
2023	713		713		36
2022	27		27		12
2021	8		8		0
2020	0		0		65
Prior	85		85		36
Revolving loans amortized cost basis	37,658		37,658		31,964
Revolving loans converted to term loans	596		596		508
Total Loans	39,413		39,413		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	199		199		326
2023	323		323		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	6,033		6,033		4,986
Revolving loans converted to term loans	0		0		0
Total Loans	6,555		6,555		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	10		10		14
Revolving loans amortized cost basis	74		74		8
Revolving loans converted to term loans	0		0		0
Total Loans	84		84		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	390		390		36
2022	27		27		12
2021	8		8		0
2020	0		0		65
Prior	75		75		22
Revolving loans amortized cost basis	31,452		31,452		26,970
Revolving loans converted to term loans	596		596		508
Total Loans	32,675		32,675		28,023
Real Estate Loans \| One- to Four-Family Residential
Financing Receivable Impaired [Line Items]
2024	27,426		27,426		58,377
2023	60,843		60,843		127,489
2022	120,418		120,418		87,992
2021	84,680		84,680		56,320
2020	53,522		53,522		11,359
Prior	72,484		72,484		68,594
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	419,373		419,373		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	2,734		2,734		9,689
2023	14,157		14,157		36,662
2022	35,081		35,081		15,529
2021	15,229		15,229		4,476
2020	4,018		4,018		4,230
Prior	11,892		11,892		9,224
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	83,111		83,111		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	636		636		0
Prior	440		440		451
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	1,076		1,076		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	24,692		24,692		48,688
2023	46,686		46,686		90,827
2022	85,337		85,337		72,463
2021	69,451		69,451		51,035
2020	48,868		48,868		7,129
Prior	60,152		60,152		58,919
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term loans	0		0		0
Total Loans	335,186		335,186		329,061
Real Estate Loans \| Multi Family
Financing Receivable Impaired [Line Items]
2024	11,373		11,373		45,188
2023	54,026		54,026		194,999
2022	202,121		202,121		26,820
2021	35,545		35,545		8,873
2020	8,682		8,682		0
Prior	8,874		8,874		9,798
Revolving loans amortized cost basis	6,354		6,354		1,683
Revolving loans converted to term loans	0		0		0
Total Loans	326,975		326,975		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	11,373		11,373		45,188
2023	54,026		54,026		194,999
2022	202,121		202,121		26,820
2021	35,545		35,545		8,873
2020	8,682		8,682		0
Prior	8,874		8,874		9,798
Revolving loans amortized cost basis	6,354		6,354		1,683
Revolving loans converted to term loans	0		0		0
Total Loans	326,975		326,975		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	22,655		22,655		43,639
2023	41,411		41,411		72,671
2022	77,828		77,828		24,138
2021	25,839		25,839		16,407
2020	15,586		15,586		4,054
Prior	32,556		32,556		31,132
Revolving loans amortized cost basis	6,805		6,805		4,324
Revolving loans converted to term loans	0		0		0
Total Loans	222,680		222,680		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	22,655		22,655		43,639
2023	41,411		41,411		72,671
2022	77,828		77,828		24,138
2021	25,839		25,839		16,407
2020	15,586		15,586		4,054
Prior	32,556		32,556		31,132
Revolving loans amortized cost basis	6,805		6,805		4,324
Revolving loans converted to term loans	0		0		0
Total Loans	222,680		222,680		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	20,074		20,074		35,828
2023	34,003		34,003		55,170
2022	39,820		39,820		17,228
2021	4,516		4,516		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	101,401		101,401		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	19,615		19,615		33,707
2023	32,207		32,207		55,170
2022	39,820		39,820		17,228
2021	4,516		4,516		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	99,146		99,146		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	459		459		2,121
2023	1,796		1,796		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	2,255		2,255		2,121
Real Estate Loans \| Commercial \| Substandard
Financing Receivable Impaired [Line Items]
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 loans	0		0
Total Loans	0		0
Other Loans \| Commercial
Financing Receivable Impaired [Line Items]
2024	5,100		5,100		4,444
2023	4,419		4,419		3,349
2022	2,768		2,768		493
2021	355		355		35
2020	20		20		89
Prior	202		202		154
Revolving loans amortized cost basis	1,644		1,644		655
Revolving loans converted to term loans	0		0		0
Total Loans	14,508		14,508		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	5,100		5,100		4,444
2023	4,419		4,419		3,349
2022	2,768		2,768		428
2021	355		355		35
2020	20		20		89
Prior	202		202		154
Revolving loans amortized cost basis	1,644		1,644		655
Revolving loans converted to term loans	0		0		0
Total Loans	14,508		14,508		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	8		8		31
2023	17		17		38
2022	31		31		45
2021	41		41		0
2020	0		0		0
Prior	8		8		13
Revolving loans amortized cost basis	36		36		46
Revolving loans converted to term loans	0		0		0
Total Loans	141		141		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	0	$ 1	3	$ 1	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

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
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- Definition

Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

+ References

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Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

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