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Condensed Financial Information - Parent Company Only Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets [Abstract]        
Other assets $ 588,957 $ 620,059    
Investments in:        
Total Assets 20,036,905 18,944,247    
Other liabilities 344,329 329,916    
Total Liabilities 17,807,048 16,823,132    
Shareholders' Equity [Abstract]        
Shareholders’ equity 2,229,857 2,121,115 $ 2,041,894 $ 1,996,665
Total Liabilities and Shareholders’ Equity 20,036,905 18,944,247    
Parent        
Assets [Abstract]        
Cash 22,857 8,568 $ 0 $ 137
Other assets 5,959 5,648    
Receivable from subsidiaries 53,880 46,715    
Investments in:        
Bank subsidiaries 2,399,053 2,265,264    
Non-bank subsidiaries 426,846 417,615    
Total Assets 2,908,595 2,743,810    
Long-term debt 386,101 362,005    
Payable to non-bank subsidiaries 206,766 183,152    
Other liabilities 85,871 77,538    
Total Liabilities 678,738 622,695    
Shareholders' Equity [Abstract]        
Shareholders’ equity 2,229,857 2,121,115    
Total Liabilities and Shareholders’ Equity $ 2,908,595 $ 2,743,810