FAIR VALUE MEASUREMENTS (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
U.S. Government Treasury [Member]
ASSETS:
Assets, Fair Value Disclosure	$ 256,798	$ 286,278
U.S. Government Agency [Member]
ASSETS:
Assets, Fair Value Disclosure	147,989	131,640
States and Political Subdivisions [Member]
ASSETS:
Assets, Fair Value Disclosure	95,990	94,839
Mortgage-Backed Securities [Member]
ASSETS:
Assets, Fair Value Disclosure	1,332	1,430
Equity Securities [Member]
ASSETS:
Assets, Fair Value Disclosure	8,737	8,547
Level 1 Inputs [Member] | U.S. Government Treasury [Member]
ASSETS:
Assets, Fair Value Disclosure	256,798	286,278
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	147,989	131,640
Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions [Member]
ASSETS:
Assets, Fair Value Disclosure	95,990	94,839
Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
ASSETS:
Assets, Fair Value Disclosure	1,332	1,430
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
ASSETS:
Assets, Fair Value Disclosure	8,737	8,547
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