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Loans Receivable and Allowance for Credit Losses - Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 25,668	$ 24,098	$ 10,310	$ 9,952	$ 9,929	$ 9,905
Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	11,236		6,043
Allowance for credit losses, collectively evaluated for impairment	14,432		4,267
Allowance for credit loss	25,668		10,310
Individually evaluated for impairment	29,758		18,916
Collectively evaluated for impairment, amount	860,134		829,400
Loans receivable, gross	889,892		848,316
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	13,360	10,039	6,966	6,787	4,980	5,063
Commercial Real Estate | Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	10,409		5,430
Allowance for credit losses, collectively evaluated for impairment	2,951		1,536
Allowance for credit loss	13,360		6,966
Individually evaluated for impairment	21,616		11,241
Collectively evaluated for impairment, amount	477,516		426,202
Loans receivable, gross	499,132		437,443
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	1,088	1,027	665	468	1,395	1,700
Residential Real Estate | Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	293		5
Allowance for credit losses, collectively evaluated for impairment	795		660
Allowance for credit loss	1,088		665
Individually evaluated for impairment	1,623		2,508
Collectively evaluated for impairment, amount	110,977		121,632
Loans receivable, gross	112,600		124,140
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	1,408	1,673	1,403	1,838	2,316	2,532
Commercial and Industrial | Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	534		608
Allowance for credit losses, collectively evaluated for impairment	874		795
Allowance for credit loss	1,408		1,403
Individually evaluated for impairment	6,040		4,653
Collectively evaluated for impairment, amount	154,456		134,134
Loans receivable, gross	160,496		138,787
Consumer and Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	9,696	11,275	1,207	739	1,063	253
Consumer and Other | Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	0		0
Allowance for credit losses, collectively evaluated for impairment	9,696		1,207
Allowance for credit loss	9,696		1,207
Individually evaluated for impairment	0		514
Collectively evaluated for impairment, amount	111,411		140,577
Loans receivable, gross	111,411		141,091
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	2	33	24	38	58	78
Construction | Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	0		0
Allowance for credit losses, collectively evaluated for impairment	2		24
Allowance for credit loss	2		24
Individually evaluated for impairment	479		0
Collectively evaluated for impairment, amount	3,311		4,922
Loans receivable, gross	3,790		4,922
Construction to Permanent - CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	114	51	10	5	15	41
Construction to Permanent - CRE | Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	0		0
Allowance for credit losses, collectively evaluated for impairment	114		10
Allowance for credit loss	114		10
Individually evaluated for impairment	0		0
Collectively evaluated for impairment, amount	2,463		1,933
Loans receivable, gross	2,463		1,933
Unallocated
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	0	$ 0	35	$ 77	$ 102	$ 238
Unallocated | Business Activities Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for impairment	0		0
Allowance for credit losses, collectively evaluated for impairment	0		35
Allowance for credit loss	0		35
Individually evaluated for impairment	0		0
Collectively evaluated for impairment, amount	0		0
Loans receivable, gross	$ 0		$ 0

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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