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Allowance for Credit Losses - Loans - Loan portfolio and allowance for credit losses (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Jan. 01, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loans:
Individually evaluated for impairment	$ 4,730			$ 3,575
Collectively evaluated for impairment	997,576			987,191
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	1,002,306			990,766
Total loans				990,766
Allowance for loan losses:
Specific reserve allocation	435			523
General reserve allocation	11,878			10,220
Total allowance for loan losses	12,313	$ 12,221	$ 11,947	10,743	$ 10,672	$ 11,568	$ 12,398
Other commercial and industrial
Loans:
Individually evaluated for impairment	1,937
Collectively evaluated for impairment	142,869
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	144,806
Allowance for loan losses:
Specific reserve allocation	434
General reserve allocation	2,310
Total allowance for loan losses	2,744	2,849	2,908
Other commercial real estate (non-owner occupied)
Loans:
Individually evaluated for impairment	2,602
Collectively evaluated for impairment	227,283
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	229,885
Allowance for loan losses:
Specific reserve allocation	1
General reserve allocation	3,182
Total allowance for loan losses	3,183	3,087	3,196	5,972
Residential mortgage
Loans:
Individually evaluated for impairment				0
Collectively evaluated for impairment	174,419			297,971
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	174,419
Total loans				297,971
Allowance for loan losses:
Specific reserve allocation	0			0
General reserve allocation	1,027			1,380
Total allowance for loan losses	1,027	1,037	1,025	1,380	1,377	1,473	1,590
Allocation for general risk
Allowance for loan losses:
Specific reserve allocation				0
General reserve allocation				653
Total allowance for loan losses				653	1,020	1,119	1,232
Commercial
Loans:
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	726,383
Total loans				679,322
Commercial | Commercial.
Loans:
Individually evaluated for impairment				1,989
Collectively evaluated for impairment				226,589
Total loans				228,578
Allowance for loan losses:
Specific reserve allocation				520
General reserve allocation				2,133
Total allowance for loan losses				2,653	2,756	3,158	3,071
Commercial | Commercial real estate (owner occupied)
Loans:
Individually evaluated for impairment	191
Collectively evaluated for impairment	88,267
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	88,458
Total loans				75,158
Allowance for loan losses:
Specific reserve allocation	0
General reserve allocation	1,544
Total allowance for loan losses	1,544	1,517	1,380
Commercial | Other commercial and industrial
Loans:
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	144,806
Commercial | Commercial real estate (non-owner occupied)
Loans:
Individually evaluated for impairment				1,586
Collectively evaluated for impairment				449,158
Total loans				450,744
Allowance for loan losses:
Specific reserve allocation				3
General reserve allocation				5,969
Total allowance for loan losses				5,972	5,432	5,716	6,392
Commercial | Commercial real estate (non-owner occupied) - retail
Loans:
Individually evaluated for impairment	0
Collectively evaluated for impairment	158,637
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	158,637
Allowance for loan losses:
Specific reserve allocation	0
General reserve allocation	1,526
Total allowance for loan losses	1,526	1,477	1,432
Commercial | Commercial real estate (non-owner occupied) - multi-family
Loans:
Individually evaluated for impairment	0
Collectively evaluated for impairment	104,597
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	104,597
Allowance for loan losses:
Specific reserve allocation	0
General reserve allocation	1,175
Total allowance for loan losses	1,175	1,145	1,226
Commercial | Other commercial real estate (non-owner occupied)
Loans:
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	229,885
Consumer.
Loans:
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	275,923
Total loans				311,444
Consumer. | Residential mortgage
Loans:
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	174,419
Total loans				297,971
Consumer. | Consumer
Loans:
Individually evaluated for impairment				0
Collectively evaluated for impairment	101,504			13,473
Loans (net of unearned income $401 on September 30, 2023 and $343 on December 31, 2022)	101,504
Total loans				13,473
Allowance for loan losses:
Specific reserve allocation	0			0
General reserve allocation	1,114			85
Total allowance for loan losses	$ 1,114	$ 1,109	$ 780	$ 85	$ 87	$ 102	$ 113

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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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