Allowance for Credit Losses - Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for loan and lease losses:
Balance at beginning of period	$ 148,942	$ 169,148	$ 157,262	$ 208,454
Charge-offs	(5,065)	(3,385)	(14,945)	(15,300)
Recoveries	2,286	2,783	7,229	9,011
Provision	2,000	(7,300)	(1,383)	(40,919)
Balance at end of period	148,163	161,246	148,163	161,246
Commercial and Industrial
Allowance for loan and lease losses:
Balance at beginning of period	15,924	23,063	20,080	24,711
Charge-offs	(328)	(224)	(1,277)	(1,517)
Recoveries	240	121	594	623
Provision	(703)	796	(4,264)	(61)
Balance at end of period	15,133	23,756	15,133	23,756
Commercial real estate
Allowance for loan and lease losses:
Balance at beginning of period	44,726	47,033	42,951	58,123
Charge-offs	(750)		(750)	(66)
Recoveries		15	14	30
Provision	416	(3,449)	2,177	(14,488)
Balance at end of period	44,392	43,599	44,392	43,599
Construction
Allowance for loan and lease losses:
Balance at beginning of period	5,367	10,152	9,773	10,039
Recoveries				166
Provision	(643)	(398)	(5,049)	(451)
Balance at end of period	4,724	9,754	4,724	9,754
Lease financing
Allowance for loan and lease losses:
Balance at beginning of period	1,398	3,067	1,659	3,298
Recoveries			60
Provision	235	(833)	(86)	(1,064)
Balance at end of period	1,633	2,234	1,633	2,234
Residential Mortgage
Allowance for loan and lease losses:
Balance at beginning of period			34,364	40,461
Charge-offs			(1)	(98)
Recoveries			245	246
Provision			(689)	(6,841)
Balance at end of period	33,919	33,768	33,919	33,768
Consumer
Allowance for loan and lease losses:
Balance at beginning of period	43,158	45,375	42,793	64,659
Charge-offs	(3,986)	(2,926)	(11,754)	(13,384)
Recoveries	1,653	2,405	5,741	7,857
Provision	2,283	(2,436)	6,328	(16,714)
Balance at end of period	43,108	42,418	43,108	42,418
Residential Lending: Residential Mortgage | Residential Mortgage
Allowance for loan and lease losses:
Balance at beginning of period	33,635	34,208
Charge-offs	(1)
Recoveries	37	215
Provision	248	(655)
Balance at end of period	33,919	33,768	33,919	33,768
Residential Lending: Home Equity Line
Allowance for loan and lease losses:
Balance at beginning of period	4,734	6,250	5,642	7,163
Charge-offs		(235)	(1,163)	(235)
Recoveries	356	27	575	89
Provision	164	(325)	200	(1,300)
Balance at end of period	$ 5,254	$ 5,717	$ 5,254	$ 5,717