Loans and Leases and the Allowance for Credit Losses - Schedule of Activity in Allowance by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Allowance for Credit Losses:
Balance at Beginning of Period	$ 157,821	$ 216,252
Loans and Leases Charged-Off	(3,908)	(6,291)
Recoveries on Loans and Leases Previously Charged-Off	2,422	3,375
Net Loans and Leases Recovered (Charged-Off)	(1,486)	(2,916)
Provision for Credit Losses	(4,307)	(14,993)
Balance at End of Period	152,028	198,343
Commercial
Allowance for Credit Losses:
Balance at Beginning of Period	64,950	84,847
Loans and Leases Charged-Off	(349)	(248)
Recoveries on Loans and Leases Previously Charged-Off	369	112
Net Loans and Leases Recovered (Charged-Off)	20	(136)
Provision for Credit Losses	(2,877)	(1,900)
Balance at End of Period	62,093	82,811
Consumer
Allowance for Credit Losses:
Balance at Beginning of Period	92,871	131,405
Loans and Leases Charged-Off	(3,559)	(6,043)
Recoveries on Loans and Leases Previously Charged-Off	2,053	3,263
Net Loans and Leases Recovered (Charged-Off)	(1,506)	(2,780)
Provision for Credit Losses	(1,430)	(13,093)
Balance at End of Period	$ 89,935	$ 115,532