Loans and Leases (Details 4) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	$ 157,697	$ 170,599
Performing Restructured Loans	56,552	64,952
Total Impaired Loans and Leases	214,249	235,551
Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	157,697	170,599
Total Impaired Loans and Leases	214,249	235,551
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	66,282	69,335
Performing Restructured Loans	47,473	54,750
Total Impaired Loans and Leases	113,755	124,085
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	0	364
Performing Restructured Loans	5,764	6,893
Total Impaired Loans and Leases	5,764	7,257
Commercial | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	91,119	100,561
Performing Restructured Loans	3,209	3,157
Total Impaired Loans and Leases	94,328	103,718
Consumer | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	296	339
Performing Restructured Loans	106	152
Total Impaired Loans and Leases	$ 402	$ 491