Annual report pursuant to Section 13 and 15(d)

PREMISES AND EQUIPMENT (Summary of Bank Premises and Equipment) (Details)

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PREMISES AND EQUIPMENT (Summary of Bank Premises and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total $ 206,702 $ 198,824
Less accumulated depreciation and amortization 86,721 76,797
Bank premises and equipment, net 119,981 122,027
Land    
Property, Plant and Equipment [Line Items]    
Total 29,706 29,708
Land Improvements and Buildings    
Property, Plant and Equipment [Line Items]    
Total 99,199 97,341
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Total 10,247 8,760
Furniture and Equipment    
Property, Plant and Equipment [Line Items]    
Total 59,041 54,188
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Total $ 8,509 $ 8,827