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Loans, net and allowance for credit losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Allowance for loan losses:
Beginning Balance	$ 40,890	$ 23,123	$ 41,776	$ 21,895
Charge-offs	(489)	(533)	(2,873)	(776)
Recoveries	280	452	1,817	619
(Credits) provisions	(838)	130	(877)	1,434
Ending balance	39,843	39,341	39,843	39,341
Ending balance: individually evaluated for impairment	1,727		1,727		$ 949
Ending balance: collectively evaluated for impairment	38,116		38,116		40,827
Loans receivable:
Loans	4,016,367		4,016,367		3,993,505
Ending balance: collectively evaluated for impairment	4,002,131		4,002,131		3,971,341
Non-PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		14,328		14,328
PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		1,841		1,841
Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	11,847		11,847		19,444
Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	2,389		2,389		2,720
Commercial
Allowance for loan losses:
Beginning Balance	6,223	2,171	6,004	2,272
Charge-offs		(5)	(572)	(51)
Recoveries	12	10	317	90
(Credits) provisions	(487)	(162)	(1)	(297)
Ending balance	5,748	4,610	5,748	4,610
Ending balance: individually evaluated for impairment	402		402		325
Ending balance: collectively evaluated for impairment	5,346		5,346		5,679
Loans receivable:
Loans	664,615		664,615		648,102
Ending balance: collectively evaluated for impairment	662,479		662,479		646,189
Commercial | Non-PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		2,259		2,259
Commercial | PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		337		337
Commercial | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	1,473		1,473		906
Commercial | Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	663		663		1,007
Municipal
Allowance for loan losses:
Beginning Balance	1,446	711	1,072	788
(Credits) provisions	(43)	(321)	331	(398)
Ending balance	1,403	963	1,403	963
Ending balance: collectively evaluated for impairment	1,403		1,403		1,072
Loans receivable:
Loans	196,469		196,469		187,918
Ending balance: collectively evaluated for impairment	196,469		196,469		187,918
Municipal | Non-PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		502		502
Municipal | PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		71		71
Commercial real estate
Allowance for loan losses:
Beginning Balance	20,620	15,156	21,804	14,153
Charge-offs	(95)	(26)	(157)	(27)
Recoveries	116	70	682	70
(Credits) provisions	569	2,172	(1,119)	3,176
Ending balance	21,210	21,892	21,210	21,892
Ending balance: individually evaluated for impairment	697		697		190
Ending balance: collectively evaluated for impairment	20,513		20,513		21,614
Loans receivable:
Loans	2,278,746		2,278,746		2,294,113
Ending balance: collectively evaluated for impairment	2,271,032		2,271,032		2,278,503
Commercial real estate | Non-PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		4,149		4,149
Commercial real estate | PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		371		371
Commercial real estate | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	7,714		7,714		15,326
Commercial real estate | Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment					284
Residential real estate
Allowance for loan losses:
Beginning Balance	5,006	4,230	4,924	3,782
Charge-offs			(92)
Recoveries	20	4	85	8
(Credits) provisions	(285)	(1,241)	(176)	(797)
Ending balance	4,741	5,246	4,741	5,246
Ending balance: individually evaluated for impairment	67		67
Ending balance: collectively evaluated for impairment	4,674		4,674		4,924
Loans receivable:
Loans	588,519		588,519		551,383
Ending balance: collectively evaluated for impairment	585,859		585,859		548,171
Residential real estate | Non-PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		1,785		1,785
Residential real estate | PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		468		468
Residential real estate | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	2,660		2,660		3,212
Consumer
Allowance for loan losses:
Beginning Balance	2,181	855	2,540	900
Charge-offs	(151)	(444)	(797)	(640)
Recoveries	109	310	427	393
(Credits) provisions	(346)	(528)	(377)	(460)
Ending balance	1,793	1,983	1,793	1,983
Ending balance: collectively evaluated for impairment	1,793		1,793		2,540
Loans receivable:
Loans	114,510		114,510		132,869
Ending balance: collectively evaluated for impairment	114,510		114,510		132,869
Consumer | Non-PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		1,470		1,470
Consumer | PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		320		320
Equipment Financing
Allowance for loan losses:
Beginning Balance	5,414		5,432
Charge-offs	(243)	(58)	(1,255)	(58)
Recoveries	23	58	306	58
(Credits) provisions	(246)	210	465	210
Ending balance	4,948	4,647	4,948	4,647
Ending balance: individually evaluated for impairment	561		561		434
Ending balance: collectively evaluated for impairment	4,387		4,387		4,998
Loans receivable:
Loans	173,508		173,508		179,120
Ending balance: collectively evaluated for impairment	171,782		171,782		177,691
Equipment Financing | Non-PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		4,163		4,163
Equipment Financing | PCD loans
Allowance for loan losses:
Gross-up for PCD Allowance for Credit Losses at Acquisition		$ 274		$ 274
Equipment Financing | Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	$ 1,726		$ 1,726		$ 1,429

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