Loans and Leases - Allowance for Loan and Lease LOsses and Reserve for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Receivables [Abstract]
Balance, beginning of period	$ 221,292	$ 138,785	$ 136,281	$ 138,785	$ 132,472
Reserve for Unfunded Loan Commitments, Balance, beginning of period	53,571	35,861	36,861	35,861	36,861
Allowance for Credit Losses, Balance, beginning of period	274,863	174,646	173,142	174,646	169,333
Allowance for Loan and Lease Losses, Charge-offs	(15,786)		(17,637)	(35,991)	(21,102)
Reserve for Unfunded Loan Commitments, Charge-offs	0		0	0	0
Allowance for Credit Losses, Charge-offs	(15,786)		(17,637)	(35,991)	(21,102)
Allowance for Loan and Lease Loss, Recoveries	2,544		6,393	3,639	9,667
Reserve for Unfunded Loan Commitments, Recoveries	0		0	0	0
Allowance for Credit Losses, Recoveries	2,544		6,393	3,639	9,667
Net charge-offs	(13,242)		(11,244)	(32,352)	(11,435)
Reserve for Unfunded Loan Commitments, Net charge-offs	0		0	0	0
Allowance For Credit Losses, Net charge-offs	(13,242)		(11,244)	(32,352)	(11,435)
Provision	93,000		10,000	191,000	14,000
Reserve for Unfunded Commitments, Provision (negative provision)	(27,000)		(2,000)	(41,000)	(2,000)
Allowance for Credit Losses, Provision (negative provision)	120,000	112,000	8,000	232,000	12,000
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	301,050	221,292	135,037	301,050	135,037
Reserve for Unfunded Loan Commitments, Balance, end of period	80,571	53,571	34,861	80,571	34,861
Allowance for Credit Losses, Balance, end of period	$ 381,621	$ 274,863	$ 169,898	381,621	$ 169,898
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method				$ 7,327