Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands		Total	Restricted Stock Units (RSUs)	Dividend paid	Dividend declared	Common Stock		Common Stock Restricted Stock Units (RSUs)	Retained Earnings	Retained Earnings Dividend paid	Retained Earnings Dividend declared	Accumulated Other Comprehensive (Loss) Income
Balance at Dec. 31, 2015		$ 89,635				$ 52,572			$ 37,265			$ (202)
Balance (in shares) at Dec. 31, 2015	[1]					16,051,406
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income		(402)										(402)
Common stock dividends		0				$ 3,949			(3,949)
Common stock dividends (in shares)						651,725
Stock options exercised		$ 6				$ 6
Stock options exercised (in shares)		2,463
Dividends		$ 0
Stock-based compensation expense		30				30
Net Income		7,385							7,385
Balance at Dec. 31, 2016		96,654				$ 56,557			40,701			(604)
Balance (in shares) at Dec. 31, 2016	[2]					16,705,594
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income		7										7
Reclassification of income tax effects from accumulated other comprehensive income		0							113			(113)
Common stock dividends		0				$ 1,220			(1,220)
Common stock dividends (in shares)						167,082
Stock options exercised		6				$ 6
Stock options exercised (in shares)						2,514
Stock options exercised			$ 0
Dividends				$ (2,870)	$ (1,182)					$ (2,870)	$ (1,182)
Restricted stock units released (in shares)								10,425
Stock-based compensation expense		97				$ 97
Net Income		8,640							8,640
Balance at Dec. 31, 2017		$ 101,352				$ 57,880			44,182			(710)
Balance (in shares) at Dec. 31, 2017		16,885,615				16,885,615	[3]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-01: reclassification of TRUPS to accumulated other comprehensive income | Accounting Standards Update 2016-01									(1,482)			1,482
Balance (in shares) at Jan. 01, 2018						16,885,615
Balance at Dec. 31, 2017		$ 101,352				$ 57,880			44,182			(710)
Balance (in shares) at Dec. 31, 2017		16,885,615				16,885,615	[3]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-01: reclassification of TRUPS to accumulated other comprehensive income		$ (1,482)
Other comprehensive income		$ (282)										(282)
Stock options exercised (in shares)		0
Dividends				$ (4,732)	$ (1,859)					$ (4,732)	$ (1,859)
Restricted stock units released (in shares)			0					61,007
Stock-based compensation expense		$ 744				$ 744
Net Income		14,017							14,017
Balance at Dec. 31, 2018		$ 109,240				$ 58,624			49,942			674
Balance (in shares) at Dec. 31, 2018		16,946,622				16,946,622	[4]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-01: recognition of previously unrealized losses within marketable equity securities		$ 184
Adoption of ASU 2016-01: recognition of previously unrealized losses within marketable equity securities | Accounting Standards Update 2016-01									(184)			184
Balance, adjusted		$ 101,352				$ 57,880			$ 42,516			$ 956

[1] Excludes 15,019 unvested restricted shares

[2] Excludes 12,015 unvested restricted shares

[3] Excludes 46,511 unvested restricted shares

[4] Excludes 59,217 unvested restricted shares