Loans and Leases - Allowance for Loan and Lease LOsses and Reserve for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jan. 01, 2020
Receivables [Abstract]
Balance, beginning of period	$ 348,181	$ 138,785
Reserve for Unfunded Loan Commitments, Balance, beginning of period	85,571	35,861
Allowance for Credit Losses, Balance, beginning of period	433,752	174,646
Allowance for Loan and Lease Losses, Charge-offs	(3,988)	(20,205)
Reserve for Unfunded Loan Commitments, Charge-offs	0	0
Allowance for Credit Losses, Charge-offs	(3,988)	(20,205)
Allowance for Loan and Lease Loss, Recoveries	1,252	1,095
Reserve for Unfunded Loan Commitments, Recoveries	0	0
Allowance for Credit Losses, Recoveries	1,252	1,095
Net charge-offs	(2,736)	(19,110)
Reserve for Unfunded Loan Commitments, Net charge-offs	0	0
Allowance For Credit Losses, Net charge-offs	(2,736)	(19,110)
Provision	(53,000)	98,000
Reserve for Unfunded Commitments, Provision (negative provision)	5,000	14,000
Balance, end of period	292,445	221,292
Reserve for Unfunded Loan Commitments, Balance, end of period	90,571	53,571
Allowance for Credit Losses, Balance, end of period	383,016	274,863
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance	348,181	221,292	$ 142,402
Reserve for Unfunded Loan Commitments	90,571	53,571	39,571
Allowance for credit losses	383,016	274,863	$ 181,973
Cumulative Effect of Change in Accounting Principle - CECL
Receivables [Abstract]
Balance, end of period		(3,617)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance		$ (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	7,327
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	3,617
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	$ 3,710