Allowance for Credit Losses - Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan and lease losses:
Balance at beginning of period	$ 208,454	$ 130,530	$ 141,718
Adoption of ASU 2016-13		770
Charge-offs	(23,623)	(47,563)	(35,987)
Recoveries	11,150	16,702	10,999
Increase (decrease) in Provision	(38,719)	108,015	13,800
Balance at end of period	157,262	208,454	130,530
Commercial and Industrial
Allowance for loan and lease losses:
Balance at beginning of period	24,711	28,975	34,501
Adoption of ASU 2016-13		(16,105)
Charge-offs	(5,949)	(15,572)	(2,718)
Recoveries	867	5,005	410
Increase (decrease) in Provision	451	22,408	(3,218)
Balance at end of period	20,080	24,711	28,975
Commercial real estate
Allowance for loan and lease losses:
Balance at beginning of period	58,123	22,325	19,725
Adoption of ASU 2016-13		10,559
Charge-offs	(66)	(2,753)
Recoveries	39	615	263
Increase (decrease) in Provision	(15,145)	27,377	2,337
Balance at end of period	42,951	58,123	22,325
Construction
Allowance for loan and lease losses:
Balance at beginning of period	10,039	4,844	5,813
Adoption of ASU 2016-13		(1,803)
Charge-offs		(379)
Recoveries	266	200
Increase (decrease) in Provision	(532)	7,177	(969)
Balance at end of period	9,773	10,039	4,844
Lease financing
Allowance for loan and lease losses:
Balance at beginning of period	3,298	424	432
Adoption of ASU 2016-13		207
Charge-offs			(24)
Increase (decrease) in Provision	(1,639)	2,667	16
Balance at end of period	1,659	3,298	424
Residential Mortgage
Allowance for loan and lease losses:
Balance at beginning of period		39,179	44,906
Charge-offs			(438)
Recoveries			967
Increase (decrease) in Provision			(6,256)
Balance at end of period			39,179
Consumer
Allowance for loan and lease losses:
Balance at beginning of period	64,659	34,644	35,813
Adoption of ASU 2016-13		15,575
Charge-offs	(16,634)	(28,791)	(32,807)
Recoveries	9,600	10,499	9,359
Increase (decrease) in Provision	(14,832)	32,732	22,279
Balance at end of period	42,793	64,659	34,644
Unallocated
Allowance for loan and lease losses:
Balance at beginning of period		139	528
Adoption of ASU 2016-13		(139)
Increase (decrease) in Provision			(389)
Balance at end of period			139
Residential mortgage
Allowance for loan and lease losses:
Balance at beginning of period	40,461	29,303
Adoption of ASU 2016-13		(2,793)
Charge-offs	(632)	(14)
Recoveries	261	216
Increase (decrease) in Provision	(5,726)	13,749
Balance at end of period	34,364	40,461	29,303
Home equity
Allowance for loan and lease losses:
Balance at beginning of period	7,163	9,876
Adoption of ASU 2016-13		(4,731)
Charge-offs	(342)	(54)
Recoveries	117	167
Increase (decrease) in Provision	(1,296)	1,905
Balance at end of period	$ 5,642	$ 7,163	$ 9,876