Loans and Leases Loans and Leases (Details 11) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance	$ 138,785				$ 132,472				$ 138,785	$ 132,472
Reserve for Unfunded Loan Commitments	35,861				36,861	$ 36,861			35,861	36,861	$ 28,635
Financing Receivable, Allowance for Credit Loss	174,646				169,333				174,646	169,333
Allowance for Loan and Lease Losses, Write-offs									32,262
Reserve for Unfunded Loan Commitments, Charge-offs									0	0
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
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									(16,687)
Provision for Loan and Lease Losses									23,000
Provision for credit losses	3,000	$ 7,000	$ 8,000	$ 4,000	12,000	11,500	$ 17,500	$ 4,000	22,000	45,000	57,752
Reserve for Unfunded Commitments, Provision									(1,000)	8,226
Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance, Covered											6,400
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and Leases Receivable, Allowance	$ 138,785				$ 132,472	132,472			138,785	132,472	139,456	[1]
Financing Receivable, Allowance for Credit Loss						$ 169,333					$ 168,091	[1]
Allowance for Loan and Lease Losses, Write-offs									32,262	59,042
Financing Receivable, Allowance for Credit Loss, Writeoff										59,042
Financing Receivable, Allowance for Credit Loss, Recovery										15,284
Allowance for Loan and Lease Losses Write-offs, Net										(43,758)
Allowance for Loan and Lease Loss, Recovery of Bad Debts									15,575	15,284
Financing Receivable, Allowance For Credit Losses, Net Charge-offs										(43,758)
Provision for Loan and Lease Losses									23,000	36,774
Provision for credit losses										45,000
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan and Lease Losses Write-offs, Net									$ (16,687)	$ (43,758)

[1] The allowance for loan losses related to PCI loans of $6.4 million as of December 31, 2017 is reflected in the beginning balance of the allowance for loan and lease losses for the year ended December 31, 2018.