Consolidated Statement of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2016	$ 293,017	$ 0	$ 127	$ 126,390	$ 215	$ 240,591	$ (74,306)
Balance (in shares) at Dec. 31, 2016			8,983,206
Net income	5,140					5,140
Other comprehensive (loss) income	1,027				1,027
Stock based compensation expenses	45			45
Shares issued under stock option plan	134			22		(39)	151
Shares issued under stock option plan (in shares)			588
Capital stock issuance	56,532			33,792			22,740
Capital stock issuance (in shares)			1,139,502
Restricted share activity under stock incentive plans	525			138			387
Restricted share activity under stock incentive plans (in shares)			19,416
Shares issued from direct stock sales	17			10			7
Shares issued from direct stock sales (in shares)			340
Common stock dividends declared	(2,246)					(2,246)
Balance at Mar. 31, 2017	354,191	0	$ 127	160,397	1,242	243,446	(51,021)
Balance (in shares) at Mar. 31, 2017			10,143,052
Balance at Dec. 31, 2017	373,286	0	$ 127	160,940	217	262,900	(50,898)
Balance (in shares) at Dec. 31, 2017			10,156,041
Net income	11,737					11,737
Other comprehensive (loss) income	(2,810)				(2,810)
Adoption of ASU 2018-02 - See Note 2	0				47	(47)
Stock based compensation expenses	84			84
Shares issued under stock option plan	56			(33)		(36)	125
Shares issued under stock option plan (in shares)			5,638
Restricted share activity under stock incentive plans	(113)			(458)		(81)	426
Restricted share activity under stock incentive plans (in shares)			19,848
Shares issued from direct stock sales	21			14			7
Shares issued from direct stock sales (in shares)			372
Common stock dividends declared	(3,047)					(3,047)
Balance at Mar. 31, 2018	$ 379,214	$ 0	$ 127	$ 160,547	$ (2,546)	$ 271,426	$ (50,340)
Balance (in shares) at Mar. 31, 2018			10,181,899