Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2016		10,793,946
Beginning balance at Dec. 31, 2016	$ 172,521	$ 60,831	$ 111,693	$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,637		4,637
Net unrealized gain on securities available for sale, net of tax	1			1
Net unrealized gain on cash flow hedging derivative instruments, net of tax	63			63
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(4)			(4)
Comprehensive income	4,697		4,637	60
Cash dividends declared	(2,487)		(2,487)
Equity compensation expense	83	$ 83
Payment to repurchase of common stock (in shares)		(5,258)
Payment to repurchase common stock	$ (146)		(146)
Issuance of restricted stock (in shares)	0	18,850
Proceeds from sale of common stock (in shares)		6,594
Proceeds from sale of common stock	$ 185	$ 185
Ending balance (in shares) at Mar. 31, 2017	10,814,132	10,814,132
Ending balance at Mar. 31, 2017	$ 174,853	$ 61,099	113,697	57
Beginning balance (in shares) at Dec. 31, 2017	10,829,918	10,829,918
Beginning balance at Dec. 31, 2017	$ 181,321	$ 61,855	121,144	(1,678)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,506		5,506
Net unrealized gain on securities available for sale, net of tax	(3,309)			(3,309)
Net unrealized gain on cash flow hedging derivative instruments, net of tax	384			384
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(8)			(8)
Comprehensive income	2,573		5,506	(2,933)
Cash dividends declared	(2,607)		(2,607)
Equity compensation expense	95	$ 95
Payment to repurchase of common stock (in shares)		(5,725)
Payment to repurchase common stock	$ (167)		(167)
Issuance of restricted stock (in shares)	0	16,795
Proceeds from sale of common stock (in shares)		5,574
Proceeds from sale of common stock	$ 157	$ 157
Ending balance (in shares) at Mar. 31, 2018	10,846,562	10,846,562
Ending balance at Mar. 31, 2018	$ 181,372	$ 62,107	$ 123,876	$ (4,611)