Condensed Financial Statements of Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Cash and cash equivalents	$ 36,990	$ 36,990	$ 25,854	$ 36,990
Securities available-for-sale			199,365	214,192
Other assets			15,543	14,418
Total Assets			902,966	896,787
Liabilities & Stockholders' Equity [Abstract]
Common stock			24,806	24,795
Additional paid-in capital			16,427	16,392
Retained earnings			56,965	55,151
Accumulated other comprehensive loss			(4,208)	(3,162)
Total liabilities and stockholders' equity			902,966	896,787
Income: [Abstract]
Other income	113	133
Total interest and dividend income	29,826	30,295
Expenses: [Abstract]
Salaries and benefits	19,878	20,747
Legal expenses	1,315	720
Service fees	807	693
Other operating expenses	2,355	2,362
Total noninterest expense	34,831	35,086
Income before income taxes	3,957	3,688
Income tax expense	160	54
Net income	3,797	3,634
Cash flows from operating activities: [Abstract]
Net income	3,797	3,634
Adjustments to reconcile net income to net cash provided by operating activities:
Increase in other assets	(567)	(3,969)
Increase (decrease) in other liabilities	(243)	3,637
Net cash provided by operating activities	8,653	7,833
Cash flows from investing activities: [Abstract]
Proceeds from maturity of investment securities	0	300
Net cash flows from investing activities	(23,637)	(15,413)
Cash flows from financing activities: [Abstract]
Cash dividends paid on common stock	(1,983)	(1,686)
Net cash provided by financing activities	3,848	11,265
Net increase (decrease) in cash and cash equivalents	(11,136)	3,685
Cash and cash equivalents at beginning of period	36,990	33,305
Cash and cash equivalents at end of period	25,854	36,990
Supplemental schedule of noncash transactions: [Abstract]
Unrealized gain (loss) on securities available-for-sale	(1,762)	(755)
Parent Company [Member]
Assets [Abstract]
Cash and cash equivalents	2,366	2,198	2,366	2,198
Securities available-for-sale			164	99
Investment in common stock of subsidiaries			91,437	90,836
Other assets			31	58
Total Assets			93,998	93,191
Liabilities & Stockholders' Equity [Abstract]
Note payable - subsidiary			8	15
Common stock			24,806	24,795
Additional paid-in capital			16,427	16,392
Retained earnings			56,965	55,151
Accumulated other comprehensive loss			(4,208)	(3,162)
Total liabilities and stockholders' equity			$ 93,998	$ 93,191
Income: [Abstract]
Dividends from subsidiary	2,900	2,900
Other income	200	200
Total interest and dividend income	3,100	3,100
Expenses: [Abstract]
Salaries and benefits	406	432
Legal expenses	774	180
Service fees	166	137
Other operating expenses	55	19
Total noninterest expense	1,401	768
Income before income taxes	1,699	2,332
Income tax expense	(408)	(193)
Net income before equity in undistributed net income of subsidiaries	2,107	2,525
Equity in undistributed net income of subsidiaries	1,690	1,109
Net income	3,797	3,634
Cash flows from operating activities: [Abstract]
Net income	3,797	3,634
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income of subsidiaries	(1,690)	(1,109)
Increase in other assets	5	(5)
Increase (decrease) in other liabilities	(7)	15
Net cash provided by operating activities	2,105	2,535
Cash flows from investing activities: [Abstract]
Net cash flows from investing activities	0	0
Cash flows from financing activities: [Abstract]
Proceeds from sale of stock	46	0
Cash dividends paid on common stock	(1,983)	(1,686)
Net cash provided by financing activities	(1,937)	(1,686)
Net increase (decrease) in cash and cash equivalents	168	849
Cash and cash equivalents at beginning of period	2,198	1,349
Cash and cash equivalents at end of period	2,366	2,198
Supplemental schedule of noncash transactions: [Abstract]
Unrealized gain (loss) on securities available-for-sale	$ 64	$ (1)