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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
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Allowance for loan losses:
Beginning Balance	$ 41,776	$ 21,895
Charge-offs	(1,233)	(108)
Recoveries	311	102
(Credits) provisions	200	708
Ending balance	41,054	22,597
Ending balance: individually evaluated for impairment	1,311		$ 949
Ending balance: collectively evaluated for impairment	39,743		40,827
Loans receivable:
Loans	3,991,539		3,993,505
Ending balance: collectively evaluated for impairment	3,968,691		3,971,341
Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	20,150		19,444
Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	2,698		2,720
Commercial
Allowance for loan losses:
Beginning Balance	6,004	2,272
Charge-offs	(157)	(5)
Recoveries	13	55
(Credits) provisions	562	(35)
Ending balance	6,422	2,287
Ending balance: individually evaluated for impairment	581		325
Ending balance: collectively evaluated for impairment	5,841		5,679
Loans receivable:
Loans	658,858		648,102
Ending balance: collectively evaluated for impairment	656,919		646,189
Commercial | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	1,035		906
Commercial | Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	904		1,007
Municipal
Allowance for loan losses:
Beginning Balance	1,072	788
(Credits) provisions	177	(90)
Ending balance	1,249	698
Ending balance: collectively evaluated for impairment	1,249		1,072
Loans receivable:
Loans	194,139		187,918
Ending balance: collectively evaluated for impairment	194,139		187,918
Commercial real estate
Allowance for loan losses:
Beginning Balance	21,804	14,153
(Credits) provisions	(943)	317
Ending balance	20,861	14,470
Ending balance: individually evaluated for impairment	192		190
Ending balance: collectively evaluated for impairment	20,669		21,614
Loans receivable:
Loans	2,275,241		2,294,113
Ending balance: collectively evaluated for impairment	2,258,889		2,278,503
Commercial real estate | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	16,068		15,326
Commercial real estate | Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	284		284
Residential real estate
Allowance for loan losses:
Beginning Balance	4,924	3,782
Charge-offs	(92)
Recoveries	1	2
(Credits) provisions	236	474
Ending balance	5,069	4,258
Ending balance: collectively evaluated for impairment	5,069		4,924
Loans receivable:
Loans	560,067		551,383
Ending balance: collectively evaluated for impairment	557,020		548,171
Residential real estate | Real estate
Loans receivable:
Ending balance: individually evaluated for impairment	3,047		3,212
Consumer
Allowance for loan losses:
Beginning Balance	2,540	900
Charge-offs	(387)	(103)
Recoveries	173	45
(Credits) provisions	(45)	42
Ending balance	2,281	$ 884
Ending balance: collectively evaluated for impairment	2,281		2,540
Loans receivable:
Loans	123,028		132,869
Ending balance: collectively evaluated for impairment	123,028		132,869
Equipment Financing
Allowance for loan losses:
Beginning Balance	5,432
Charge-offs	(597)
Recoveries	124
(Credits) provisions	213
Ending balance	5,172
Ending balance: individually evaluated for impairment	538		434
Ending balance: collectively evaluated for impairment	4,634		4,998
Loans receivable:
Loans	180,206		179,120
Ending balance: collectively evaluated for impairment	178,696		177,691
Equipment Financing | Non-real estate
Loans receivable:
Ending balance: individually evaluated for impairment	$ 1,510		$ 1,429

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