Loans and Leases - Allowance for Loan and Lease LOsses and Reserve for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Receivables [Abstract]
Balance, beginning of period	$ 301,050		$ 135,037	$ 138,785	$ 132,472
Reserve for Unfunded Loan Commitments, Balance, beginning of period	80,571		34,861	35,861	36,861
Allowance for Credit Losses, Balance, beginning of period	381,621		169,898	174,646	169,333
Allowance for Loan and Lease Losses, Charge-offs	(37,284)		(6,501)	(73,275)	(27,603)
Reserve for Unfunded Loan Commitments, Charge-offs	0		0	0	0
Allowance for Credit Losses, Charge-offs	(37,284)		(6,501)	(73,275)	(27,603)
Allowance for Loan and Lease Loss, Recoveries	1,200		2,016	4,839	11,683
Reserve for Unfunded Loan Commitments, Recoveries	0		0	0	0
Allowance for Credit Losses, Recoveries	1,200		2,016	4,839	11,683
Net charge-offs	(36,084)		(4,485)	(68,436)	(15,920)
Reserve for Unfunded Loan Commitments, Net charge-offs	0		0	0	0
Allowance For Credit Losses, Net charge-offs	(36,084)		(4,485)	(68,436)	(15,920)
Provision	81,000		8,000	272,000	22,000
Reserve for Unfunded Commitments, Provision (negative provision)	(16,000)		(1,000)	(57,000)	(3,000)
Allowance for Credit Losses, Provision (negative provision)	97,000	$ 120,000	7,000	329,000	19,000
Financing Receivable, Allowance for Loan and Lease Losses, Effect of Change in Method				3,617
Financing Receivable, Allowance for Unfunded Commitments, Effect of Change in Method				3,710
Balance, end of period	345,966	301,050	138,552	345,966	138,552
Reserve for Unfunded Loan Commitments, Balance, end of period	96,571	80,571	33,861	96,571	33,861
Allowance for Credit Losses, Balance, end of period	$ 442,537	$ 381,621	$ 172,413	442,537	$ 172,413
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method				$ 7,327