Loans and Leases (Details 4) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases		$ 112,972	$ 155,784	[1]
Performing Restructured Loans		22,106	56,838	[1]
Total Impaired Loans and Leases		135,078	212,622	[1]
Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	[2]		155,784
Total Impaired Loans and Leases	[3]		212,622
Real Estate Mortgage
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases		32,982
Performing Restructured Loans		15,296
Total Impaired Loans and Leases		48,278
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	[1],[2]		68,913
Performing Restructured Loans	[1]		47,560
Total Impaired Loans and Leases	[1],[3]		116,473
Real Estate Construction and Land
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases		0
Performing Restructured Loans		5,533
Total Impaired Loans and Leases		5,533
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	[1],[2]		0
Performing Restructured Loans	[1]		5,690
Total Impaired Loans and Leases	[1],[3]		5,690
Commercial
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases		79,718
Performing Restructured Loans		1,166
Total Impaired Loans and Leases		80,884
Commercial | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	[1],[2]		86,851
Performing Restructured Loans	[1]		3,488
Total Impaired Loans and Leases	[1],[3]		90,339
Consumer
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases		272
Performing Restructured Loans		111
Total Impaired Loans and Leases		$ 383
Consumer | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	[1],[2]		20
Performing Restructured Loans	[1]		100
Total Impaired Loans and Leases	[1],[3]		$ 120

[1] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[2] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[3] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.