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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
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment $ 129,608     $ 120,341    
Individually evaluated for impairment 36,527     37,469    
Allowance for loan losses 166,135 $ 170,233 $ 160,537 157,810 $ 156,050 $ 169,910
Collectively evaluated for impairment 16,503,657     15,751,600    
Individually evaluated for impairment 183,209     173,493    
Loans and leases, net of unearned income 16,686,866   16,165,800 15,925,093    
Real-estate - commercial mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 42,766     46,812    
Individually evaluated for impairment 6,614     7,299    
Allowance for loan losses 49,380 54,859 52,889 54,111 56,583 58,793
Collectively evaluated for impairment 6,543,781     6,290,143    
Individually evaluated for impairment 60,853     47,841    
Loans and leases, net of unearned income 6,604,634   6,434,285 6,337,984    
Commercial - industrial, financial and agricultural            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 58,722     47,028    
Individually evaluated for impairment 10,459     8,906    
Allowance for loan losses 69,181 66,341 58,868 55,934 59,045 66,280
Collectively evaluated for impairment 4,453,062     4,235,953    
Individually evaluated for impairment 41,434     52,870    
Loans and leases, net of unearned income 4,494,496   4,404,548 4,288,823    
Real-estate - home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 8,033     7,856    
Individually evaluated for impairment 9,920     10,755    
Allowance for loan losses 17,953 18,981 18,911 18,611 16,247 18,127
Collectively evaluated for impairment 1,323,950     1,444,898    
Individually evaluated for impairment 22,165     24,254    
Loans and leases, net of unearned income 1,346,115   1,452,137 1,469,152    
Real estate - residential mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 9,678     8,369    
Individually evaluated for impairment 9,012     9,743    
Allowance for loan losses 18,690 18,892 18,921 18,112 14,504 16,088
Collectively evaluated for impairment 2,533,295     2,133,718    
Individually evaluated for impairment 37,498     39,830    
Loans and leases, net of unearned income 2,570,793   2,251,044 2,173,548    
Real estate - construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 3,970     4,718    
Individually evaluated for impairment 413     761    
Allowance for loan losses 4,383 4,928 5,061 5,479 5,988 6,620
Collectively evaluated for impairment 909,811     971,167    
Individually evaluated for impairment 3,833     8,690    
Loans and leases, net of unearned income 913,644   916,599 979,857    
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 3,495     2,841    
Individually evaluated for impairment 5     5    
Allowance for loan losses 3,500 3,363 3,217 2,846 1,699 2,045
Collectively evaluated for impairment 464,206     390,700    
Individually evaluated for impairment 7     8    
Loans and leases, net of unearned income 464,213   419,186 390,708    
Equipment lease financing, other and overdrafts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 2,944     2,717    
Individually evaluated for impairment 104     0    
Allowance for loan losses 3,048 $ 2,869 2,670 2,717 $ 1,984 $ 1,957
Collectively evaluated for impairment 275,552     285,021    
Individually evaluated for impairment 17,419     0    
Loans and leases, net of unearned income $ 292,971   $ 288,001 $ 285,021