Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details)

v3.6.0.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 31, 2015
Accounting Policies [Line Items]        
Unrecognized Tax Benefits Threshold Percentage 50.00%      
Advertising Expense $ 544,000 $ 562,000 $ 477,000  
Goodwill       $ 13,617,000
Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total 2,652,000 3,600,000 $ 1,659,000  
Adjustments for New Accounting Principle, Early Adoption [Member]        
Accounting Policies [Line Items]        
Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total $ 4,800,000      
Metro Bancshares, Inc [Member]        
Accounting Policies [Line Items]        
Finite-Lived Intangible Assets, Remaining Amortization Period 7 years      
Goodwill $ 13,600,000      
Minimum [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 3 years      
Maximum [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life 10 years      
Federal Reserve Bank [Member]        
Accounting Policies [Line Items]        
Cash Reserve Deposit Required and Made $ 39,200,000 $ 26,600,000