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Employee Benefit and Deferred Compensation Plans (Details Textual)
1 Months Ended 12 Months Ended
Jan. 31, 2015
shares
Dec. 31, 2015
USD ($)
point
plan
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2007
plan
Jul. 01, 2015
USD ($)
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Company contribution to pension benefit plan   $ 0 $ 0      
Accumulated benefit obligation   $ 27,856,000 28,087,000      
Retiring age limit, minimum   55 years        
Retiring age limit, maximum   65 years        
Eligible employee from service (in years)   15 years        
Number of points for eligibility (points) | point   70        
Minimum eligible age for Medicare coverage   65 years        
Life insurance coverage face value   $ 5,000        
Life insurance maturity age   70 years        
Additional life insurance maturity age   70 years        
Health care cost trend rate (percent)   5.60%        
Employee deferrals (percent)   4.00%        
Percentage of plan compensation as nondiscretionary contribution (percent)   5.00%        
Percentage of plan compensation in excess of social security wage base (percent)   5.00%        
Hours of service credited to the employees during the year   1000 hours        
Employee deferrals amounts   $ 9,271,000 7,230,000 $ 5,488,000    
Incentive compensation plan expense   $ 3,608,000 4,100,000 4,376,000    
Number of deferred compensation plans, including deferred stock unit plan | plan   3        
Number of conventional deferred compensation plans | plan   2        
Company's deferred compensation plan expense   $ 1,225,000 1,383,000 2,088,000    
Option expiration period   10 years        
Option exercisable period   3 years        
Intrinsic value of options exercised   $ 2,445,000 2,519,000 1,655,000    
Fair Value of options vested in period   $ 235,000 458,000 535,000    
Common shares reserved for issuance under employee benefit plans (shares) | shares   1,030,578        
Supplemental Employee Retirement Plans, Defined Benefit            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Number of plans assumed in acquisition | plan         4  
Number of officers provided for via plan | plan         4  
Expiration period of benefits payable subsequent to retirement (in years)   15 years        
Supplemental executive retirement liabilities totaled   $ 3,364,000 3,094,000      
Maximum | Other equity securities            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Equity income strategy (percent)   70.00%        
Maximum | Debt Securities            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Equity income strategy (percent)   40.00%        
Minimum | Other equity securities            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Equity income strategy (percent)   60.00%        
Minimum | Debt Securities            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Equity income strategy (percent)   30.00%        
Time- Based Restricted Stock            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Cancelled (shares) | shares   4,250        
Unrecognized stock-based compensation expense   $ 1,463,000        
Weighted average period over which unrecognized expense is expected to be recognized (in years)   1 year 8 months 9 days        
Performance- Based Restricted Stock            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Compensation expense   $ 3,884,000 3,647,000 2,330,000    
Service period (in years)   1 year        
Performance-based restricted stock based on the target level of performance goals (shares) | shares 81,750          
Cancelled (shares) | shares 2,750 2,750        
Additional shares issued (shares) | shares 15,916          
Shares awarded, other than options (shares) | shares 94,916          
Stock compensation plan            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Compensation expense   $ 73,000 $ 262,000 $ 469,000    
Unrecognized stock-based compensation expense   0        
HeritageBank            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Accumulated benefit obligation   $ 12,913,000        
Heritage Financial Group            
Employee Benefit and Deferred Compensation Plans (Textual) [Abstract]            
Loans outstanding related to employee stock ownership plan acquired           $ 2,839,000