Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.10.0.1
FAIR VALUE MEASUREMENTS (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
U.S. Government Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure $ 258,738 $ 235,341
U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 159,909 144,644
States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 66,131 91,157
Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 998 1,185
Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 7,886 8,584
Level 1 Inputs [Member] | U.S. Government Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure 258,738 235,341
Level 1 Inputs [Member] | U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 1 Inputs [Member] | States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 1 Inputs [Member] | Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Level 1 Inputs [Member] | Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member] | U.S. Government Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member] | U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 159,909 144,644
Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 66,131 91,157
Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 998 1,185
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 7,886 8,584
Fair Value, Inputs, Level 3 [Member] | U.S. Government Treasury [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | U.S. Government Agency [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | States and Political Subdivisions [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]    
ASSETS:    
Assets, Fair Value Disclosure $ 0 $ 0