Loans and Credit Quality Loans and Credit Quality (Details 5) - NonCovered [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 131,178	$ 83,621
Impaired Financing Receivable Performing Restructured Loans	38,203	35,244
Impaired Financing Receivable, Recorded Investment	169,381	118,865
Mortgage Loans on Real Estate [Member]
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	34,248	37,612
Impaired Financing Receivable Performing Restructured Loans	23,863	20,245
Impaired Financing Receivable, Recorded Investment	58,111	57,857
Real Estate Construction [Member]
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	377	1,559
Impaired Financing Receivable Performing Restructured Loans	7,741	8,996
Impaired Financing Receivable, Recorded Investment	8,118	10,555
Commercial Portfolio Segment [Member]
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	93,141	40,965
Impaired Financing Receivable Performing Restructured Loans	6,350	5,744
Impaired Financing Receivable, Recorded Investment	99,491	46,709
Consumer Portfolio Segment [Member]
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,412	3,485
Impaired Financing Receivable Performing Restructured Loans	249	259
Impaired Financing Receivable, Recorded Investment	$ 3,661	$ 3,744