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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Impaired Financing Receivables [Line Items]      
Percentage of unallocated allowance 7.00%   4.00%
Unpaid principal balance, with no related allowance $ 75,399 $ 68,022  
Unpaid principal balance, with related allowance 165,756 167,682  
Unpaid Principal Balance 241,155 235,704  
Recorded investment, with no related allowance 61,583 59,073  
Recorded investment, with related allowance 132,928 129,628  
Recorded Investment 194,511 188,701  
Related Allowance 48,993 60,867  
Real-estate commercial mortage [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with no related allowance 31,961 25,802  
Unpaid principal balance, with related allowance 48,734 49,619  
Recorded investment, with no related allowance 26,075 23,236  
Recorded investment, with related allowance 40,034 40,023  
Related Allowance 13,197 16,715  
Commercial - Secured [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with no related allowance 22,097 17,599  
Unpaid principal balance, with related allowance 29,415 24,824  
Recorded investment, with no related allowance 17,661 14,582  
Recorded investment, with related allowance 23,533 19,335  
Related Allowance 11,789 12,165  
Commercial - unsecured [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with no related allowance 86 0  
Unpaid principal balance, with related allowance 2,832 1,241  
Recorded investment, with no related allowance 86 0  
Recorded investment, with related allowance 2,672 1,089  
Related Allowance 932 865  
Real-estate - home equity [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with no related allowance 0 0  
Unpaid principal balance, with related allowance 18,854 19,392  
Recorded investment, with no related allowance 0 0  
Recorded investment, with related allowance 14,178 13,458  
Related Allowance 7,183 9,224  
Real-estate - residential mortgage [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with no related allowance 6,607 4,873  
Unpaid principal balance, with related allowance 54,604 56,607  
Recorded investment, with no related allowance 6,201 4,873  
Recorded investment, with related allowance 45,106 46,478  
Related Allowance 13,423 18,592  
Construction - commercial residential [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with no related allowance 13,353 18,041  
Unpaid principal balance, with related allowance 9,613 14,007  
Recorded investment, with no related allowance 10,417 14,801  
Recorded investment, with related allowance 6,019 7,903  
Related Allowance 1,985 2,675  
Construction - Commercial [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with no related allowance 1,295 1,707  
Unpaid principal balance, with related allowance 1,223 1,501  
Recorded investment, with no related allowance 1,143 1,581  
Recorded investment, with related allowance 1,077 1,023  
Related Allowance 363 459  
Construction other [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with related allowance 452 452  
Recorded investment, with related allowance 280 281  
Related Allowance 102 137  
Consumer - direct [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with related allowance 14 19  
Recorded investment, with related allowance 14 19  
Related Allowance 10 17  
Consumer - Indirect [Member]      
Impaired Financing Receivables [Line Items]      
Unpaid principal balance, with related allowance 15 20  
Recorded investment, with related allowance 15 19  
Related Allowance $ 9 $ 18