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Allowance for Credit Losses and Credit Quality - Allowance for Loan and Lease Losses and Balances Outstanding by Allowance Methodology (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Allowance for loan and lease losses
Collectively evaluated for impairment		$ 102,186
Individually evaluated for impairment		7,237
Total	$ 406,383	113,052	$ 147,972	$ 157,446
Loans and leases outstanding
Collectively evaluated for impairment		34,074,141
Individually evaluated for impairment		176,537
Total	35,921,614	34,497,464
Portfolios acquired with deteriorated credit quality
Allowance for loan and lease losses
Total		3,629
Loans and leases outstanding
Total		246,786
Consumer
Allowance for loan and lease losses
Collectively evaluated for impairment		26,430
Individually evaluated for impairment		1,468
Total	175,057	28,572	74,297	80,017
Loans and leases outstanding
Collectively evaluated for impairment		11,087,534
Individually evaluated for impairment		60,694
Total	11,398,769	11,221,123
Consumer \| Portfolios acquired with deteriorated credit quality
Allowance for loan and lease losses
Total		674
Loans and leases outstanding
Total		72,895
Commercial
Allowance for loan and lease losses
Collectively evaluated for impairment		75,756
Individually evaluated for impairment		5,769
Total	231,326	84,480	$ 73,675	$ 77,429
Loans and leases outstanding
Collectively evaluated for impairment		22,986,607
Individually evaluated for impairment		115,843
Total	$ 24,522,845	23,276,341
Commercial \| Portfolios acquired with deteriorated credit quality
Allowance for loan and lease losses
Total		2,955
Loans and leases outstanding
Total		$ 173,891