Allowance for Credit Losses - Activity in allowance for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 39,907	$ 41,468	$ 39,779	$ 48,305
Provision for credit losses	1,200	1,050	4,800	(4,750)
Loans charged -off	(3,601)	(5,653)	(11,520)	(11,318)
Recoveries	1,528	2,630	5,975	7,258
Ending Balance	39,034	39,495	39,034	39,495
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12,450	16,469	12,949	18,883
Provision for credit losses	(199)	(1,403)	(630)	(3,835)
Loans charged -off	(187)	(2,406)	(702)	(3,659)
Recoveries	177	634	624	1,905
Ending Balance	12,241	13,294	12,241	13,294
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	15,268	14,168	14,568	18,316
Provision for credit losses	(747)	297	(81)	(3,952)
Loans charged -off	(50)	(57)	(192)	(579)
Recoveries	67	55	243	678
Ending Balance	14,538	14,463	14,538	14,463
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,653	10,584	12,104	10,721
Provision for credit losses	2,303	2,199	5,290	3,218
Loans charged -off	(3,364)	(3,190)	(10,626)	(7,080)
Recoveries	1,284	1,941	5,108	4,675
Ending Balance	11,876	11,534	11,876	11,534
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	536	247	158	385
Provision for credit losses	(157)	(43)	221	(181)
Ending Balance	$ 379	$ 204	$ 379	$ 204