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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jan. 01, 2020
Receivables [Abstract]
Balance, beginning of period	$ 225,600	$ 301,050	$ 348,181	$ 138,785
Reserve for Unfunded Loan Commitments, Balance, beginning of period	74,571	80,571	85,571	35,861
Allowance for Credit Losses, Balance, beginning of period	300,171	381,621	433,752	174,646
Allowance for Loan and Lease Losses, Charge-offs	(1,516)	(37,284)	(6,320)	(73,275)
Reserve for Unfunded Loan Commitments, Charge-offs	0	0	0	0
Allowance for Credit Losses, Charge-offs	(1,516)	(37,284)	(6,320)	(73,275)
Allowance for Loan and Lease Loss, Recoveries	1,149	1,200	8,372	4,839
Reserve for Unfunded Loan Commitments, Recoveries	0	0	0	0
Allowance for Credit Losses, Recoveries	1,149	1,200	8,372	4,839
Net (charge-offs) recoveries	(367)	(36,084)	2,052	(68,436)
Reserve for Unfunded Loan Commitments, Net charge-offs	0	0	0	0
Allowance For Credit Losses, Net charge-offs	(367)	(36,084)	2,052	(68,436)
Provision	(21,500)	81,000	(146,500)	272,000
Reserve for Unfunded Commitments, Provision (negative provision)	1,500	(16,000)	(9,500)	57,000
Balance, end of period	203,733	345,966	203,733	345,966
Reserve for Unfunded Loan Commitments, Balance, end of period	76,071	96,571	76,071	96,571
Allowance for Credit Losses, Balance, end of period	279,804	442,537	279,804	442,537
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance	203,733	345,966	203,733	345,966	$ 142,402
Reserve for Unfunded Loan Commitments	76,071	96,571	76,071	96,571	39,571
Allowance for credit losses	$ 279,804	442,537	279,804	442,537	$ 181,973
Cumulative Effect of Change in Accounting Principle - CECL
Receivables [Abstract]
Balance, end of period		(3,617)		(3,617)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance		$ (3,617)		$ (3,617)
Restatement Adjustment | Cumulative Effect of Change in Accounting Principle - CECL
Receivables [Abstract]
Allowance for Credit Losses, Balance, beginning of period			7,327
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses
Restatement Adjustment | Cumulative Effect of Change in Accounting Principle - CECL | SEC Schedule, 12-09, Allowance, Loan and Lease Loss
Receivables [Abstract]
Balance, beginning of period			3,617
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance
Restatement Adjustment | Cumulative Effect of Change in Accounting Principle - CECL | Reserve For Unfunded Commitments
Receivables [Abstract]
Reserve for Unfunded Loan Commitments, Balance, beginning of period			$ 3,710
Financing Receivable, Allowance for Credit Loss [Line Items]
Reserve for Unfunded Loan Commitments