SECURITIES - Securities Available for Sale (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	$ 288,279,000		$ 297,947,000
Unrealized Gains	147,000		514,000
Unrealized Losses	9,442,000		5,370,000
Estimated Fair Value	278,984,000		293,091,000
Amortized Cost [Abstract]
Within one year	18,365,000
After one, but within five years	19,992,000
After five, but within ten years	28,720,000
After ten years	839,000
Total	67,916,000
Fair Value [Abstract]
Within one year	18,350,000
After one, but within five years	19,911,000
After five, but within ten years	28,245,000
After ten years	811,000
Total	67,317,000
Estimated Fair Value	278,984,000		293,091,000
Proceeds from maturities and principal collected on securities held to maturity	0	$ 0
Obligations of U.S. Government and U.S. Government sponsored enterprises
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	15,490,000		15,492,000
Unrealized Gains	15,000		20,000
Unrealized Losses	54,000		21,000
Estimated Fair Value	15,451,000		15,491,000
Fair Value [Abstract]
Estimated Fair Value	15,451,000		15,491,000
Mortgage-backed securities, residential
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	216,489,000		224,939,000
Unrealized Gains	87,000		136,000
Unrealized Losses	8,757,000		5,166,000
Estimated Fair Value	207,819,000		219,909,000
Amortized Cost [Abstract]
Without single maturity date	216,489,000
Fair Value [Abstract]
Without single maturity date	207,819,000
Estimated Fair Value	207,819,000		219,909,000
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	52,177,000		52,928,000
Unrealized Gains	44,000		355,000
Unrealized Losses	604,000		151,000
Estimated Fair Value	51,617,000		53,132,000
Fair Value [Abstract]
Estimated Fair Value	51,617,000		53,132,000
Corporate bonds and notes
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	249,000		249,000
Unrealized Gains	0		2,000
Unrealized Losses	0		0
Estimated Fair Value	249,000		251,000
Fair Value [Abstract]
Estimated Fair Value	249,000		251,000
SBA loan pools
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	3,874,000		4,339,000
Unrealized Gains	1,000		1,000
Unrealized Losses	27,000		32,000
Estimated Fair Value	3,848,000		4,308,000
Amortized Cost [Abstract]
Without single maturity date	3,874,000
Fair Value [Abstract]
Without single maturity date	3,848,000
Estimated Fair Value	$ 3,848,000		$ 4,308,000