Loans and Allowance for Credit Losses for Loans - Summary of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Allowance for loan losses:
Beginning balance	$ 359,202	$ 340,243
Loans charged-off	(2,595)	(8,800)
Charged-off loans recovered	2,645	2,745
Net (charge-offs) recoveries	50	(6,055)
Provision (credit) for loan losses	3,258	8,692
Ending balance	362,510	342,880
Commercial and industrial
Allowance for loan losses:
Beginning balance	103,090	131,070
Loans charged-off	(1,571)	(7,142)
Charged-off loans recovered	824	1,589
Net (charge-offs) recoveries	(747)	(5,553)
Provision (credit) for loan losses	(1,140)	891
Ending balance	101,203	126,408
Commercial Real Estate
Allowance for loan losses:
Beginning balance	217,490	164,113
Loans charged-off	(173)	(382)
Charged-off loans recovered	107	69
Net (charge-offs) recoveries	(66)	(313)
Provision (credit) for loan losses	2,525	10,436
Ending balance	219,949	174,236
Residential Mortgage
Allowance for loan losses:
Beginning balance	25,120	28,873
Loans charged-off	(26)	(138)
Charged-off loans recovered	457	157
Net (charge-offs) recoveries	431	19
Provision (credit) for loan losses	2,638	(1,720)
Ending balance	28,189	27,172
Consumer
Allowance for loan losses:
Beginning balance	13,502	16,187
Loans charged-off	(825)	(1,138)
Charged-off loans recovered	1,257	930
Net (charge-offs) recoveries	432	(208)
Provision (credit) for loan losses	(765)	(915)
Ending balance	$ 13,169	$ 15,064