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Allowance for Loan and Lease Losses and Credit Quality - Allowance for Loan and Lease Losses and Balances Outstanding by Allowance Methodology (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan and lease losses:
Collectively evaluated for impairment	$ 102,186		$ 125,253
Individually evaluated for impairment	7,237		32,193
Total	113,052	$ 113,100	157,446	$ 171,041	$ 160,269
Loans and leases outstanding:
Collectively evaluated for impairment	34,074,141		18,873,125
Individually evaluated for impairment	176,537		196,078
Loans acquired with deteriorated credit quality	246,786		3,817
Loans and leases	34,497,464		19,073,020
Consumer Loan Portfolio
Allowance for loan and lease losses:
Collectively evaluated for impairment	26,430		57,113
Individually evaluated for impairment	1,468		22,904
Total	28,572		80,017	98,085	92,292
Loans and leases outstanding:
Collectively evaluated for impairment	11,087,534		7,285,753
Individually evaluated for impairment	60,694		128,159
Loans acquired with deteriorated credit quality	72,895		0
Loans and leases	11,221,123		7,413,912
Commercial
Allowance for loan and lease losses:
Collectively evaluated for impairment	75,756		68,140
Individually evaluated for impairment	5,769		9,289
Total	84,480		77,429	$ 72,956	$ 67,977
Loans and leases outstanding:
Collectively evaluated for impairment	22,986,607		11,587,372
Individually evaluated for impairment	115,843		67,919
Loans acquired with deteriorated credit quality	173,891		3,817
Loans and leases	23,276,341		11,659,108
Portfolios acquired with deteriorated credit quality
Allowance for loan and lease losses:
Loans acquired with deteriorated credit quality	3,629
Loans and leases outstanding:
Loans and leases	246,786		$ 3,817
Portfolios acquired with deteriorated credit quality \| Consumer Loan Portfolio
Allowance for loan and lease losses:
Loans acquired with deteriorated credit quality	674
Portfolios acquired with deteriorated credit quality \| Commercial
Allowance for loan and lease losses:
Loans acquired with deteriorated credit quality	$ 2,955