Allowance for Loan and Lease Losses and Credit Quality - Rollfowards of the Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for loan and lease losses
Balance, beginning of period	$ 146,503	$ 165,619	$ 157,446	$ 171,041
Charge-offs	(35,547)	(19,448)	(81,044)	(57,501)
Recoveries	6,969	12,658	19,730	23,790
Net (charge-offs) recoveries	(28,578)	(6,790)	(61,314)	(33,711)
Provision for credit losses	27,188	2,270	50,879	27,874
Other	(23,895)	(478)	(25,793)	(4,583)
Balance, end of period	121,218	160,621	121,218	160,621
Consumer
Allowance for loan and lease losses
Balance, beginning of period	70,711	91,241	80,017	98,085
Charge-offs	(14,098)	(15,942)	(43,922)	(48,120)
Recoveries	5,330	11,711	15,840	21,299
Net (charge-offs) recoveries	(8,768)	(4,231)	(28,082)	(26,821)
Provision for credit losses	4,693	(847)	16,644	18,872
Other	(23,849)	(299)	(25,792)	(4,272)
Balance, end of period	42,787	85,864	42,787	85,864
Commercial
Allowance for loan and lease losses
Balance, beginning of period	75,792	74,378	77,429	72,956
Charge-offs	(21,449)	(3,506)	(37,122)	(9,381)
Recoveries	1,639	947	3,890	2,491
Net (charge-offs) recoveries	(19,810)	(2,559)	(33,232)	(6,890)
Provision for credit losses	22,495	3,117	34,235	9,002
Other	(46)	(179)	(1)	(311)
Balance, end of period	$ 78,431	$ 74,757	$ 78,431	$ 74,757