Loans and Leases Loans and Leases (Details 8) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$ 132,472				$ 139,456	[1],[2]				$ 132,472	$ 139,456	[1],[2]
Reserve for Unfunded Loan Commitments	36,861				28,635	[2]				36,861	28,635	[2]	$ 17,523
Financing Receivable, Allowance for Credit Losses	169,333				168,091	[2]				169,333	168,091	[2]	174,761
Allowance for Loan and Lease Losses, Write-offs										59,042
Reserve for Unfunded Loan Commitments, Charge-offs										0	0
Financing Receivable, Allowance for Credit Losses, Write-downs										59,042	80,296
Financing Receivable, Allowance for Credit Losses, Recovery										15,284	11,548
Allowance for Loan and Lease Losses Write-offs, Net										(43,758)	(68,748)
Allowance for Loan and Lease Loss, Recovery of Bad Debts										15,284
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										(43,758)	(68,748)
Provision for Loan and Lease Losses										36,774
Provision for credit losses	$ 12,000	$ 11,500	$ 17,500	$ 4,000	6,406		$ 15,119	$ 11,499	$ (24,728)	45,000	57,752		65,729
Reserve for Unfunded Loan Commitments, Fair Value											4,326
Reserve for Unfunded Commitments, Provision										$ 8,226	6,786
Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance					6,444						6,444
Allowance for Loan and Lease Losses, Write-offs											6,154
Allowance for Loan and Lease Losses Write-offs, Net											(5,791)
Allowance for Loan and Lease Loss, Recovery of Bad Debts											363
Provision for Loan and Lease Losses											(1,248)
Loans and Leases Receivable, Allowance, Covered					6,444						6,444		13,483
Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance					133,012						133,012		143,755
Financing Receivable, Allowance for Credit Losses					$ 161,647						161,647		161,278
Allowance for Loan and Lease Losses, Write-offs											74,142
Financing Receivable, Allowance for Credit Losses, Write-downs											74,142
Financing Receivable, Allowance for Credit Losses, Recovery											11,185
Allowance for Loan and Lease Losses Write-offs, Net											(62,957)
Allowance for Loan and Lease Loss, Recovery of Bad Debts											11,185
Financing Receivable, Allowance For Credit Losses, Net Charge-offs											(62,957)
Provision for Loan and Lease Losses											52,214
Provision for credit losses											59,000
Reserve for Unfunded Commitments, Provision													$ 4,326
Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Write-offs, Net											$ (62,957)

[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.

[2] 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.