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Business Combinations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2018
Oct. 02, 2018
May 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Oct. 31, 2018
Dec. 31, 2017
Jan. 13, 2017
Mar. 11, 2016
Business Acquisition [Line Items]                      
Available-for-sale Securities, Gross Realized Losses         $ 0   $ 29        
Available-for-sale Securities, Gross Realized Gains         1,337   4,693        
Purchase price           $ 112,657          
Assets       $ 34,954,659   34,954,659     $ 34,527,512    
Loans and leases       24,886,347   24,886,347     23,596,825    
Deposits       30,163,537   30,163,537     29,266,275    
PCI loans and leases                   $ 15,555 $ 199,682
Gain on acquisitions       0 0 0 134,745        
Merger-related expenses       1,126 $ 562 4,136 $ 8,248        
Revenue generated       6,800   11,800          
Goodwill       208,217   208,217     $ 150,601    
Capital Commerce Bancorp                      
Business Acquisition [Line Items]                      
Assets       222,300   222,300          
Loans and leases       189,600   189,600          
Deposits       171,900   171,900          
Palmetto Heritage Bancshares                      
Business Acquisition [Line Items]                      
Assets       164,900   164,900          
Loans and leases       136,400   136,400          
Deposits       123,100   123,100          
HomeBancorp Inc.                      
Business Acquisition [Line Items]                      
Business Acquisition, Share Price     $ 15.03                
Purchase price     $ 112,700                
Cash and cash equivalents     6,359                
Overnight investments     10,393                
Investment securities available for sale     200,918                
Loans held for sale     791                
Loans     566,173                
PCI loans and leases     15,555                
Core deposit intangible     9,900                
Non-PCI Loans     550,618                
Premises and equipment     6,542                
Other real estate owned     2,135                
Income earned not collected     2,717                
Intangible asset     13,206                
Other assets     33,459                
Total assets acquired     842,693                
Deposits     619,589                
Short-term borrowings     108,973                
Accrued interest payable     1,020                
Long-term obligations     52,944                
Other liabilities     5,126                
Total liabilities assumed     787,652                
Fair value of net assets (liabilities) assumed     $ 55,041                
Goodwill acquired           57,616          
Merger-related expenses       $ 200   $ 1,900          
Subsequent Event | Capital Commerce Bancorp                      
Business Acquisition [Line Items]                      
Business Acquisition, Share Price   $ 4.75                  
Purchase price   $ 28,100                  
Subsequent Event | Palmetto Heritage Bancshares                      
Business Acquisition [Line Items]                      
Business Acquisition, Share Price               $ 135.00      
Purchase price $ 30,400