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Mergers and Acquisitions-Fair Value Adjustments (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 01, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Deal charges paid on behalf of Heritage   $ 11,614 $ 694 $ 6,027
Goodwill   $ 445,871 $ 274,706 $ 276,100
Heritage Financial Group        
Business Acquisition [Line Items]        
Fair value of common stock on date of issuance (usd per share) $ 32.60      
Value of stock paid $ 281,530      
Cash paid for fractional shares 26      
Cash settlement for stock options 5,915      
Deal charges paid on behalf of Heritage 7,909      
Total Purchase Price 295,380      
Stockholders’ equity at acquisition date 160,652      
Total net assets acquired 124,198      
Goodwill $ 171,182      
Heritage Financial Group | Common Stock        
Business Acquisition [Line Items]        
Shares issued to common shareholders (shares) 8,635,879      
Heritage Financial Group | Deposits        
Business Acquisition [Line Items]        
Liabilities, fair value adjustment $ (3,776)      
Heritage Financial Group | Other liabilities        
Business Acquisition [Line Items]        
Liabilities, fair value adjustment (2,882)      
Heritage Financial Group | Deferred income taxes        
Business Acquisition [Line Items]        
Liabilities, fair value adjustment (10,580)      
Heritage Financial Group | Securities        
Business Acquisition [Line Items]        
Assets, fair value adjustment (1,401)      
Heritage Financial Group | Mortgage loans held for sale        
Business Acquisition [Line Items]        
Assets, fair value adjustment (2,640)      
Heritage Financial Group | Loans, net of Heritage’s allowance for loan losses        
Business Acquisition [Line Items]        
Assets, fair value adjustment (15,524)      
Heritage Financial Group | Fixed assets        
Business Acquisition [Line Items]        
Assets, fair value adjustment (7,169)      
Heritage Financial Group | Intangible assets, net of Heritage’s existing core deposit intangible        
Business Acquisition [Line Items]        
Assets, fair value adjustment 18,193      
Heritage Financial Group | Other real estate owned        
Business Acquisition [Line Items]        
Assets, fair value adjustment 1,390      
Heritage Financial Group | FDIC loss-share indemnification asset        
Business Acquisition [Line Items]        
Assets, fair value adjustment (15,247)      
Heritage Financial Group | Other assets        
Business Acquisition [Line Items]        
Assets, fair value adjustment $ 3,182