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Loans, net and allowance for credit losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Allowance for loan losses:
Beginning Balance	$ 23,123	$ 23,218	$ 21,895	$ 27,472
Charge-offs	(533)	(65)	(776)	(217)
Recoveries	452	23	619	141
(Credits) provisions	130	(166)	1,434	(1,103)
Ending balance	39,341	23,010	39,341	23,010
Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				(3,283)
Adjusted Balance
Allowance for loan losses:
Beginning Balance				24,189
Non-PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	14,328		14,328
PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	1,841		1,841
Commercial
Allowance for loan losses:
Beginning Balance	2,171	2,751	2,272	4,365
Charge-offs	(5)		(51)	(4)
Recoveries	10	4	90	9
(Credits) provisions	(162)	(504)	(297)	(436)
Ending balance	4,610	2,251	4,610	2,251
Commercial | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				(1,683)
Commercial | Adjusted Balance
Allowance for loan losses:
Beginning Balance				2,682
Commercial | Non-PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	2,259		2,259
Commercial | PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	337		337
Municipal
Allowance for loan losses:
Beginning Balance	711	827	788	1,247
(Credits) provisions	(321)	40	(398)	(1,127)
Ending balance	963	867	963	867
Municipal | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				747
Municipal | Adjusted Balance
Allowance for loan losses:
Beginning Balance				1,994
Municipal | Non-PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	502		502
Municipal | PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	71		71
Commercial real estate
Allowance for loan losses:
Beginning Balance	15,156	14,961	14,153	17,915
Charge-offs	(26)		(27)
Recoveries	70		70	1
(Credits) provisions	2,172	134	3,176	523
Ending balance	21,892	15,095	21,892	15,095
Commercial real estate | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				(3,344)
Commercial real estate | Adjusted Balance
Allowance for loan losses:
Beginning Balance				14,571
Commercial real estate | Non-PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	4,149		4,149
Commercial real estate | PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	371		371
Residential real estate
Allowance for loan losses:
Beginning Balance	4,230	3,767	3,782	3,072
Recoveries	4	3	8	22
(Credits) provisions	(1,241)	128	(797)	(163)
Ending balance	5,246	3,898	5,246	3,898
Residential real estate | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				967
Residential real estate | Adjusted Balance
Allowance for loan losses:
Beginning Balance				4,039
Residential real estate | Non-PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	1,785		1,785
Residential real estate | PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	468		468
Consumer
Allowance for loan losses:
Beginning Balance	855	912	900	873
Charge-offs	(444)	(65)	(640)	(213)
Recoveries	310	16	393	109
(Credits) provisions	(528)	36	(460)	100
Ending balance	1,983	$ 899	1,983	899
Consumer | Cumulative impact of adoption | ASC 326
Allowance for loan losses:
Beginning Balance				30
Consumer | Adjusted Balance
Allowance for loan losses:
Beginning Balance				$ 903
Consumer | Non-PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	1,470		1,470
Consumer | PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	320		320
Equipment Financing
Allowance for loan losses:
Charge-offs	(58)		(58)
Recoveries	58		58
(Credits) provisions	210		210
Ending balance	4,647		4,647
Equipment Financing | Non-PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	4,163		4,163
Equipment Financing | PCD loans
Allowance for loan losses:
PCD Allowance for Credit Losses at Acquisition	$ 274		$ 274

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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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-Topic 326
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