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Loans and Allowance for Credit Losses Total Impaired Loans by Class Segments (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance $ 75,596 $ 68,022
Unpaid principal balance, with related allowance 168,686 167,682
Unpaid Principal Balance 244,282 235,704
Recorded investment, with no related allowance 59,992 59,073
Recorded investment, with related allowance 132,629 129,628
Recorded Investment 192,621 188,701
Related Allowance 47,563 60,867
Real-estate commercial mortage [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 29,836 25,802
Unpaid principal balance, with related allowance 49,792 49,619
Recorded investment, with no related allowance 24,357 23,236
Recorded investment, with related allowance 41,110 40,023
Related Allowance 13,452 16,715
Commercial - Secured [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 24,250 17,599
Unpaid principal balance, with related allowance 26,694 24,824
Recorded investment, with no related allowance 17,557 14,582
Recorded investment, with related allowance 21,239 19,335
Related Allowance 10,020 12,165
Commercial - unsecured [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 3,062 1,241
Recorded investment, with related allowance 2,904 1,089
Related Allowance 1,060 865
Real-estate - home equity [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 18,752 19,392
Recorded investment, with related allowance 13,278 13,458
Related Allowance 6,668 9,224
Real-estate - residential mortgage [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 6,630 4,873
Unpaid principal balance, with related allowance 56,048 56,607
Recorded investment, with no related allowance 6,223 4,873
Recorded investment, with related allowance 46,972 46,478
Related Allowance 14,024 18,592
Construction - commercial residential [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 13,581 18,041
Unpaid principal balance, with related allowance 11,976 14,007
Recorded investment, with no related allowance 10,699 14,801
Recorded investment, with related allowance 5,472 7,903
Related Allowance 1,771 2,675
Construction - Commercial [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with no related allowance 1,299 1,707
Unpaid principal balance, with related allowance 1,879 1,501
Recorded investment, with no related allowance 1,156 1,581
Recorded investment, with related allowance 1,342 1,023
Related Allowance 445 459
Construction other [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 452 452
Recorded investment, with related allowance 281 281
Related Allowance 103 137
Consumer - direct [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 15 19
Recorded investment, with related allowance 15 19
Related Allowance 10 17
Consumer - Indirect [Member]    
Impaired Financing Receivables [Line Items]    
Unpaid principal balance, with related allowance 16 20
Recorded investment, with related allowance 16 19
Related Allowance $ 10 $ 18