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Condensed Parent Company Information (Condensed Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Cash on deposit with bank subsidiary $ 489,490 $ 305,993 $ 267,268 $ 253,084
Premises and equipment 116,233 75,351    
Other assets 64,677 42,998    
Total assets 5,547,037 3,614,862    
Liabilities and shareholders' equity        
Trust preferred securities 407,543 271,394    
Other liabilities 38,325 27,475    
Total liabilities 4,854,058 3,246,761    
Shareholders' equity 692,979 368,101 342,190 387,699
Total liabilities and shareholders' equity 5,547,037 3,614,862    
Parent Company [Member]        
Assets        
Cash on deposit with bank subsidiary 4,535 4,530 $ 3,816 $ 4,272
Investment in wholly-owned subsidiaries, at equity 745,669 410,261    
Premises and equipment 7 7    
Other assets 1,659    
Total assets 750,211 416,457    
Liabilities and shareholders' equity        
Trust preferred securities 53,758 46,394    
Other liabilities 3,474 1,962    
Total liabilities 57,232 48,356    
Shareholders' equity 692,979 368,101    
Total liabilities and shareholders' equity $ 750,211 $ 416,457