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Mergers and Acquisitions-First Financial Holdings, Inc. Merger- (Details) - USD ($)
$ in Thousands
Aug. 21, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Goodwill   $ 338,340 $ 338,340 $ 317,688
Bank of America        
Business Combination Recognized Identifiable Assets Acquired [Abstract]        
Cash and cash equivalents $ 428,567      
Loans 3,150      
Premises and equipment 4,129      
Intangible assets 6,800      
Other assets 66      
Total assets 442,712      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Deposits 438,289      
Other liabilities (acquired) 56      
Total liabilities 438,345      
Net identifiable assets acquired over (under) liabilities assumed 4,367      
Goodwill 20,652      
Net assets acquired over liabilities assumed 25,019      
Consideration:        
Business combination deposit premium paid 25,019      
Fair value of total consideration transferred 25,019      
Bank of America | As previously recorded by acquiree        
Business Combination Recognized Identifiable Assets Acquired [Abstract]        
Cash and cash equivalents 428,567      
Loans 3,445      
Premises and equipment 6,267      
Other assets 66      
Total assets 438,345      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Deposits 438,289      
Other liabilities (acquired) 56      
Total liabilities 438,345      
Bank of America | Fair Value Adjustments        
Business Combination Recognized Identifiable Assets Acquired [Abstract]        
Loans (295)      
Premises and equipment (2,138)      
Intangible assets 6,800      
Total assets 4,367      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Net identifiable assets acquired over (under) liabilities assumed 4,367      
Goodwill 20,652      
Net assets acquired over liabilities assumed 25,019      
Bank of America | Interest-bearing Deposits        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Deposits 340,849      
Bank of America | Interest-bearing Deposits | As previously recorded by acquiree        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Deposits 340,849      
Bank of America | Non interest-bearing deposits        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Deposits 97,440      
Bank of America | Non interest-bearing deposits | As previously recorded by acquiree        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]        
Deposits $ 97,440