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Loans Receivable and Allowance for Credit Losses - Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for credit losses	$ 14,984	$ 14,989	$ 15,925	$ 25,668	$ 24,098	$ 10,310
Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated loans	7,010		4,205
Collectively evaluated loans	7,974		11,720
Total allowance for credit losses	14,984		15,925
Individually evaluated loans	34,989		17,133
Collectively evaluated loans	720,682		831,726
Loans receivable, gross	755,671		848,859
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for credit losses	9,045	7,958	6,089	13,360	10,039	6,966
Commercial Real Estate \| Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated loans	7,010		3,813
Collectively evaluated loans	2,035		2,276
Total allowance for credit losses	9,045		6,089
Individually evaluated loans	28,254		12,775
Collectively evaluated loans	423,901		459,318
Loans receivable, gross	452,155		472,093
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for credit losses	608	678	607	1,088	1,027	665
Residential Real Estate \| Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated loans	0		0
Collectively evaluated loans	608		607
Total allowance for credit losses	608		607
Individually evaluated loans	0		0
Collectively evaluated loans	94,579		106,783
Loans receivable, gross	94,579		106,783
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for credit losses	1,056	1,215	1,269	1,408	1,673	1,403
Commercial and Industrial \| Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated loans	0		392
Collectively evaluated loans	1,056		877
Total allowance for credit losses	1,056		1,269
Individually evaluated loans	4,378		3,904
Collectively evaluated loans	129,955		159,661
Loans receivable, gross	134,333		163,565
Consumer and Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for credit losses	4,273	5,133	7,843	9,696	11,275	1,207
Consumer and Other \| Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated loans	0		0
Collectively evaluated loans	4,273		7,843
Total allowance for credit losses	4,273		7,843
Individually evaluated loans	0		0
Collectively evaluated loans	68,418		99,688
Loans receivable, gross	68,418		99,688
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for credit losses	2	5	4	2	33	24
Construction \| Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated loans	0		0
Collectively evaluated loans	2		4
Total allowance for credit losses	2		4
Individually evaluated loans	0		454
Collectively evaluated loans	3,829		3,812
Loans receivable, gross	3,829		4,266
Construction to Permanent - CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Total allowance for credit losses	0	$ 0	113	$ 114	$ 51	$ 10
Construction to Permanent - CRE \| Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated loans	0		0
Collectively evaluated loans	0		113
Total allowance for credit losses	0		113
Individually evaluated loans	2,357		0
Collectively evaluated loans	0		2,464
Loans receivable, gross	$ 2,357		$ 2,464