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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	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Allowance for loan and lease losses
Collectively evaluated for impairment	$ 96,243		$ 125,253
Individually evaluated for impairment	24,975		32,193
Total	121,218	$ 146,503	157,446	$ 160,621	$ 165,619	$ 171,041
Loans and leases outstanding
Collectively evaluated for impairment	32,972,580		18,873,126
Individually evaluated for impairment	244,459		196,078
PCI loans	293,713		3,816
Total	33,510,752		19,073,020
Consumer
Allowance for loan and lease losses
Collectively evaluated for impairment	26,024		57,113
Individually evaluated for impairment	16,763		22,904
Total	42,787	70,711	80,017	85,864	91,241	98,085
Loans and leases outstanding
Collectively evaluated for impairment	11,016,429		7,285,753
Individually evaluated for impairment	132,900		128,159
PCI loans	79,737		0
Total	11,229,066		7,413,912
Commercial
Allowance for loan and lease losses
Collectively evaluated for impairment	70,219		68,140
Individually evaluated for impairment	8,212		9,289
Total	78,431	$ 75,792	77,429	$ 74,757	$ 74,378	$ 72,956
Loans and leases outstanding
Collectively evaluated for impairment	21,956,151		11,587,373
Individually evaluated for impairment	111,559		67,919
PCI loans	213,976		3,816
Total	$ 22,281,686		$ 11,659,108