Loans - 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]
Balance at beginning of period	$ 53,964	$ 47,883	$ 52,435	$ 47,252
Additions (deductions)
Provision for credit losses	1,355	3,135	3,840	3,783
Recoveries credited to the allowance	757	730	2,082	2,004
Loans charged against the allowance	(581)	(606)	(2,862)	(1,897)
Balance at end of period	55,495	51,142	55,495	51,142
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	16,284	11,059	13,817	11,519
Additions (deductions)
Provision for credit losses	1,112	1,184	4,350	496
Recoveries credited to the allowance	178	202	436	430
Loans charged against the allowance	(24)	0	(1,053)	0
Balance at end of period	17,550	12,445	17,550	12,445
Mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	20,080	20,313	21,633	19,221
Additions (deductions)
Provision for credit losses	(170)	1,219	(1,835)	2,087
Recoveries credited to the allowance	112	78	255	346
Loans charged against the allowance	0	0	(31)	(44)
Balance at end of period	20,022	21,610	20,022	21,610
Installment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4,315	4,220	4,290	3,749
Additions (deductions)
Provision for credit losses	(42)	263	280	1,203
Recoveries credited to the allowance	467	450	1,391	1,228
Loans charged against the allowance	(557)	(606)	(1,778)	(1,853)
Balance at end of period	4,183	4,327	4,183	4,327
Subjective Allocation
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	13,285	12,291	12,695	12,763
Additions (deductions)
Provision for credit losses	455	469	1,045	(3)
Recoveries credited to the allowance	0	0	0	0
Loans charged against the allowance	0	0	0	0
Balance at end of period	$ 13,740	$ 12,760	$ 13,740	$ 12,760