Loans and Leases (Details 12) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance		$ 348,181				$ 138,785				$ 348,181	$ 138,785	$ 132,472	$ 142,402
Reserve for Unfunded Loan Commitments		85,571				35,861				85,571	35,861	36,861	39,571
Financing Receivable, Allowance for Credit Loss		433,752								433,752			$ 181,973
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change of Income Taxes	[1]									(5,283)
Allowance for Loan and Lease Losses, Write-offs										93,589	32,262
Reserve for Unfunded Loan Commitments, Charge-offs										0	0
Financing Receivable, Allowance for Credit Loss, Writeoff										93,589
Financing Receivable, Allowance for Credit Loss, Recovery										6,368
Allowance for Loan and Lease Losses Write-offs, Net										(87,221)	16,687
Allowance for Loan and Lease Loss, Recovery of Bad Debts										6,368	15,575
Reserve for Unfunded Loan Commitments, Recoveries										0	0
Reserve for Unfunded Loan Commitments, Net Charge-offs										0	0
Financing Receivable, Allowance For Credit Losses, Net Charge-offs										(87,221)
Provision for Loan and Lease Losses										293,000	23,000
Provision for credit losses		$ 10,000	$ 97,000	$ 120,000	$ 112,000	3,000	$ 7,000	$ 8,000	$ 4,000	339,000	22,000	45,000
Reserve for Unfunded Commitments, Provision										$ 46,000	(1,000)
Previously Reported
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance						138,785					138,785
Reserve for Unfunded Loan Commitments						35,861					35,861
Financing Receivable, Allowance for Credit Loss						174,646					174,646
Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance						3,617					3,617
Cumulative Effect of Change in Accounting Principle - CECL | Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss						7,327					7,327
Cumulative Effect of Change in Accounting Principle - CECL | SEC Schedule, 12-09, Allowance, Loan and Lease Loss | Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance						3,617					3,617
Cumulative Effect of Change in Accounting Principle - CECL | Reserve For Unfunded Commitments | Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Reserve for Unfunded Loan Commitments						3,710					3,710
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance						138,785					138,785	132,472
Financing Receivable, Allowance for Credit Loss						$ 174,646					174,646	$ 169,333
Allowance for Loan and Lease Losses, Write-offs											32,262
Financing Receivable, Allowance for Credit Loss, Writeoff											32,262
Financing Receivable, Allowance for Credit Loss, Recovery											15,575
Allowance for Loan and Lease Losses Write-offs, Net											(16,687)
Allowance for Loan and Lease Loss, Recovery of Bad Debts											15,575
Financing Receivable, Allowance For Credit Losses, Net Charge-offs											(16,687)
Provision for Loan and Lease Losses											23,000
Provision for credit losses											$ 22,000

[1] Impact due to adoption on January 1, 2020 of ASU 2016-13, "Financial Instruments - Credit Losses (ASC 326): Measurement of Credit Losses on Financial Instruments," and the related amendments, commonly referred to as CECL.