Allowance for Loan and Lease Losses and Credit Quality - Rollforwards of the Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan and lease losses
Balance, beginning of period	$ 113,100			$ 157,446				$ 171,041	$ 157,446	$ 171,041	$ 160,269
Charge-offs									(97,935)	(84,728)	(79,092)
Recoveries									30,384	29,703	34,652
Net (charge-offs) recoveries									(67,551)	(55,025)	(44,440)
Provision for credit losses	14,403	$ 27,188	$ 13,569	10,122	$ 18,894	$ 2,270	$ 14,236	11,368	65,282	46,768	68,443
Other									(42,125)	(5,338)	(13,231)
Balance, end of period	113,052	$ 113,100			157,446				113,052	157,446	171,041
Consumer Loan Portfolio
Allowance for loan and lease losses
Balance, beginning of period				80,017				98,085	80,017	98,085	92,292
Charge-offs									(50,480)	(64,520)	(59,831)
Recoveries									23,653	26,487	30,916
Net (charge-offs) recoveries									(26,827)	(38,033)	(28,915)
Provision for credit losses									17,492	24,851	47,911
Other									(42,110)	(4,886)	(13,203)
Balance, end of period	28,572				80,017				28,572	80,017	98,085
Commercial Loan and Lease Portfolio
Allowance for loan and lease losses
Balance, beginning of period				$ 77,429				$ 72,956	77,429	72,956	67,977
Charge-offs									(47,455)	(20,208)	(19,261)
Recoveries									6,731	3,216	3,736
Net (charge-offs) recoveries									(40,724)	(16,992)	(15,525)
Provision for credit losses									47,790	21,917	20,532
Other									(15)	(452)	(28)
Balance, end of period	$ 84,480				$ 77,429				$ 84,480	$ 77,429	$ 72,956