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Loans and Allowance for Credit Losses Present Loans, Net of Unearned Income and Their Related Allowance for Loan Losses, by Portfolio Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment $ 122,942   $ 124,882  
Loans individually evaluated for impairment 40,275   45,194  
Allowance for loan losses 163,217 $ 169,910 170,076 $ 168,679
Loans collectively evaluated for impairment 15,501,704   14,786,290  
Loans individually evaluated for impairment 194,580   176,887  
Loans, net of unearned income 15,696,284 15,768,247 14,963,177  
Real-estate - commercial mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment 50,392   37,457  
Loans individually evaluated for impairment 8,325   9,916  
Allowance for loan losses 58,717 58,793 47,373 46,842
Loans collectively evaluated for impairment 6,279,144   6,067,492  
Loans individually evaluated for impairment 53,364   51,041  
Loans, net of unearned income 6,332,508 6,364,804 6,118,533  
Commercial - industrial, financial and agricultural        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment 51,314   43,155  
Loans individually evaluated for impairment 10,516   12,154  
Allowance for loan losses 61,830 66,280 55,309 54,353
Loans collectively evaluated for impairment 4,234,362   4,119,550  
Loans individually evaluated for impairment 64,710   48,259  
Loans, net of unearned income 4,299,072 4,300,297 4,167,809  
Real-estate - home equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment 6,440   14,744  
Loans individually evaluated for impairment 11,088   9,077  
Allowance for loan losses 17,528 18,127 23,821 26,801
Loans collectively evaluated for impairment 1,489,429   1,576,949  
Loans individually evaluated for impairment 24,812   18,952  
Loans, net of unearned income 1,514,241 1,559,719 1,595,901  
Real estate - residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment 5,610   10,581  
Loans individually evaluated for impairment 9,651   11,437  
Allowance for loan losses 15,261 16,088 22,018 22,929
Loans collectively evaluated for impairment 1,935,587   1,620,302  
Loans individually evaluated for impairment 40,937   44,840  
Loans, net of unearned income 1,976,524 1,954,711 1,665,142  
Real-estate - construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment 5,245   4,915  
Loans individually evaluated for impairment 679   2,586  
Allowance for loan losses 5,924 6,620 7,501 6,455
Loans collectively evaluated for impairment 965,398   869,225  
Loans individually evaluated for impairment 10,733   13,758  
Loans, net of unearned income 976,131 1,006,935 882,983  
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment 1,887   3,007  
Loans individually evaluated for impairment 16   24  
Allowance for loan losses 1,903 2,045 3,031 3,574
Loans collectively evaluated for impairment 326,742   288,789  
Loans individually evaluated for impairment 24   37  
Loans, net of unearned income 326,766 313,783 288,826  
Leasing, other and overdrafts        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment 2,054   3,268  
Loans individually evaluated for impairment 0   0  
Allowance for loan losses 2,054 1,957 3,268 3,192
Loans collectively evaluated for impairment 271,042   243,983  
Loans individually evaluated for impairment 0   0  
Loans, net of unearned income 271,042 267,998 243,983  
Unallocated        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans collectively evaluated for impairment     7,755  
Allowance for loan losses $ 0 $ 0 $ 7,755 $ 4,533