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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, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment $ 122,924   $ 122,942  
Loans individually evaluated for impairment 39,185   40,275  
Allowance for loan losses 162,109 $ 160,537 163,217 $ 169,910
Collectively evaluated for impairment 16,073,549   15,501,704  
Individually evaluated for impairment 189,084   194,580  
Loans and leases, net of unearned income 16,262,633 16,165,800 15,696,284  
Real-estate - commercial mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 45,736   50,392  
Loans individually evaluated for impairment 6,210   8,325  
Allowance for loan losses 51,946 52,889 58,717 58,793
Collectively evaluated for impairment 6,384,048   6,279,144  
Individually evaluated for impairment 44,640   53,364  
Loans and leases, net of unearned income 6,428,688 6,434,285 6,332,508  
Commercial - industrial, financial and agricultural        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 48,266   51,314  
Loans individually evaluated for impairment 12,235   10,516  
Allowance for loan losses 60,501 58,868 61,830 66,280
Collectively evaluated for impairment 4,373,677   4,234,362  
Individually evaluated for impairment 55,861   64,710  
Loans and leases, net of unearned income 4,429,538 4,404,548 4,299,072  
Real-estate - home equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 8,619   6,440  
Loans individually evaluated for impairment 10,596   11,088  
Allowance for loan losses 19,215 18,911 17,528 18,127
Collectively evaluated for impairment 1,389,670   1,489,429  
Individually evaluated for impairment 23,830   24,812  
Loans and leases, net of unearned income 1,413,500 1,452,137 1,514,241  
Real estate - residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 9,560   5,610  
Loans individually evaluated for impairment 9,586   9,651  
Allowance for loan losses 19,146 18,921 15,261 16,088
Collectively evaluated for impairment 2,274,330   1,935,587  
Individually evaluated for impairment 39,578   40,937  
Loans and leases, net of unearned income 2,313,908 2,251,044 1,976,524  
Real estate - construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 4,390   5,245  
Loans individually evaluated for impairment 551   679  
Allowance for loan losses 4,941 5,061 5,924 6,620
Collectively evaluated for impairment 946,436   965,398  
Individually evaluated for impairment 6,651   10,733  
Loans and leases, net of unearned income 953,087 916,599 976,131  
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 3,312   1,887  
Loans individually evaluated for impairment 7   16  
Allowance for loan losses 3,319 3,217 1,903 2,045
Collectively evaluated for impairment 433,534   326,742  
Individually evaluated for impairment 11   24  
Loans and leases, net of unearned income 433,545 419,186 326,766  
Equipment lease financing, other and overdrafts        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 3,041   2,054  
Loans individually evaluated for impairment 0   0  
Allowance for loan losses 3,041 2,670 2,054 $ 1,957
Collectively evaluated for impairment 271,854   271,042  
Individually evaluated for impairment 18,513   0  
Loans and leases, net of unearned income $ 290,367 $ 288,001 $ 271,042