Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 50,550	$ 45,627	$ 52,435	$ 47,252
Additions (deductions)
Provision for credit losses	3,317	2,221	2,485	648
Recoveries credited to the allowance	747	653	1,325	1,274
Loans charged against the allowance	(650)	(618)	(2,281)	(1,291)
Balance at end of period	53,964	47,883	53,964	47,883
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	13,533	10,744	13,817	11,519
Additions (deductions)
Provision for credit losses	2,590	164	3,238	(688)
Recoveries credited to the allowance	230	151	258	228
Loans charged against the allowance	(69)	0	(1,029)	0
Balance at end of period	16,284	11,059	16,284	11,059
Mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	20,113	19,208	21,633	19,221
Additions (deductions)
Provision for credit losses	(91)	1,046	(1,665)	868
Recoveries credited to the allowance	59	97	143	268
Loans charged against the allowance	(1)	(38)	(31)	(44)
Balance at end of period	20,080	20,313	20,080	20,313
Installment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4,054	3,604	4,290	3,749
Additions (deductions)
Provision for credit losses	383	791	322	940
Recoveries credited to the allowance	458	405	924	778
Loans charged against the allowance	(580)	(580)	(1,221)	(1,247)
Balance at end of period	4,315	4,220	4,315	4,220
Subjective Allocation
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	12,850	12,071	12,695	12,763
Additions (deductions)
Provision for credit losses	435	220	590	(472)
Recoveries credited to the allowance	0	0	0	0
Loans charged against the allowance	0	0	0	0
Balance at end of period	$ 13,285	$ 12,291	$ 13,285	$ 12,291