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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, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment $ 120,341     $ 126,544    
Loans individually evaluated for impairment 37,469     45,701    
Allowance for loan losses 157,810 $ 156,050 $ 169,910 172,245 $ 172,342 $ 168,679
Loans collectively evaluated for impairment 15,751,600     15,300,419    
Loans individually evaluated for impairment 173,493     186,480    
Loans, net of unearned income 15,925,093   15,768,247 15,486,899    
Real-estate - commercial mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 46,812     47,261    
Loans individually evaluated for impairment 7,299     7,726    
Allowance for loan losses 54,111 56,583 58,793 54,987 57,372 46,842
Loans collectively evaluated for impairment 6,290,143     6,228,935    
Loans individually evaluated for impairment 47,841     46,205    
Loans, net of unearned income 6,337,984   6,364,804 6,275,140    
Commercial - industrial, financial and agricultural            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 47,028     55,486    
Loans individually evaluated for impairment 8,906     15,499    
Allowance for loan losses 55,934 59,045 66,280 70,985 67,642 54,353
Loans collectively evaluated for impairment 4,235,953     4,162,857    
Loans individually evaluated for impairment 52,870     60,218    
Loans, net of unearned income 4,288,823   4,300,297 4,223,075    
Real-estate - home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 7,856     7,632    
Loans individually evaluated for impairment 10,755     10,826    
Allowance for loan losses 18,611 16,247 18,127 18,458 17,456 26,801
Loans collectively evaluated for impairment 1,444,898     1,543,551    
Loans individually evaluated for impairment 24,254     23,922    
Loans, net of unearned income 1,469,152   1,559,719 1,567,473    
Real estate - residential mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 8,369     6,488    
Loans individually evaluated for impairment 9,743     10,195    
Allowance for loan losses 18,112 14,504 16,088 16,683 16,439 22,929
Loans collectively evaluated for impairment 2,133,718     1,845,329    
Loans individually evaluated for impairment 39,830     42,578    
Loans, net of unearned income 2,173,548   1,954,711 1,887,907    
Real-estate - construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 4,718     5,702    
Loans individually evaluated for impairment 761     1,434    
Allowance for loan losses 5,479 5,988 6,620 7,136 9,534 6,455
Loans collectively evaluated for impairment 971,167     959,584    
Loans individually evaluated for impairment 8,690     13,524    
Loans, net of unearned income 979,857   1,006,935 973,108    
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 2,841     1,976    
Loans individually evaluated for impairment 5     21    
Allowance for loan losses 2,846 1,699 2,045 1,997 1,794 3,574
Loans collectively evaluated for impairment 390,700     302,415    
Loans individually evaluated for impairment 8     33    
Loans, net of unearned income 390,708   313,783 302,448    
Leasing, other and overdrafts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 2,717     1,999    
Loans individually evaluated for impairment 0     0    
Allowance for loan losses 2,717 1,984 1,957 1,999 2,105 3,192
Loans collectively evaluated for impairment 285,021     257,748    
Loans individually evaluated for impairment 0     0    
Loans, net of unearned income 285,021   267,998 257,748    
Unallocated            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 0 $ 0 $ 0 $ 0 $ 0 $ 4,533