Loans and Leases (Details 4) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 79,333	$ 155,784	[1]
Impaired Financing Receivable Performing Restructured Loans		17,701	56,838	[1]
Impaired Financing Receivable, Recorded Investment		97,034	212,622	[1]
Mortgages [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		17,845
Impaired Financing Receivable Performing Restructured Loans		11,484
Impaired Financing Receivable, Recorded Investment		29,329
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		442
Impaired Financing Receivable Performing Restructured Loans		5,420
Impaired Financing Receivable, Recorded Investment		5,862
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		60,003
Impaired Financing Receivable Performing Restructured Loans		692
Impaired Financing Receivable, Recorded Investment		60,695
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		1,043
Impaired Financing Receivable Performing Restructured Loans		105
Impaired Financing Receivable, Recorded Investment		$ 1,148
Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]		155,784
Impaired Financing Receivable, Recorded Investment	[3]		212,622
Non Purchased Credit Impaired Loans and Leases [Member] | Mortgages [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1],[2]		68,913
Impaired Financing Receivable Performing Restructured Loans	[1]		47,560
Impaired Financing Receivable, Recorded Investment	[1],[3]		116,473
Non Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1],[2]		0
Impaired Financing Receivable Performing Restructured Loans	[1]		5,690
Impaired Financing Receivable, Recorded Investment	[1],[3]		5,690
Non Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1],[2]		86,851
Impaired Financing Receivable Performing Restructured Loans	[1]		3,488
Impaired Financing Receivable, Recorded Investment	[1],[3]		90,339
Non Purchased Credit Impaired Loans and Leases [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1],[2]		20
Impaired Financing Receivable Performing Restructured Loans	[1]		100
Impaired Financing Receivable, Recorded Investment	[1],[3]		$ 120

[1] Excludes PCI loans.

[2] Excludes PCI loans.

[3] Excludes PCI loans.