Allowance for Credit Losses - Activity in allowance for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 39,767	$ 39,779	$ 39,779
Provision for credit losses	1,800	1,800
Loans charged -off	(3,192)	(4,376)
Recoveries	1,670	2,417
Ending Balance	40,045	39,620	39,767
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13,264	12,949	12,949
Provision for credit losses	271	(54)
Loans charged -off	(231)	(306)
Recoveries	275	201
Ending Balance	13,579	12,790	13,264
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14,327	14,568	14,568
Provision for credit losses	(173)	500
Loans charged -off	(14)	(79)
Recoveries	93	70
Ending Balance	14,233	15,059	14,327
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,797	12,104	12,104
Provision for credit losses	1,767	1,254
Loans charged -off	(2,947)	(3,991)
Recoveries	1,302	2,146
Ending Balance	11,919	11,513	11,797
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	379	158	158
Provision for credit losses	(65)	100
Ending Balance	$ 314	$ 258	$ 379