Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($) $ in Thousands		Total	Restricted Stock Units (RSUs)	Dividend declared	Common Stock		Common Stock Restricted Stock Units (RSUs)	Retained Earnings	Retained Earnings Dividend declared	Accumulated Other Comprehensive (Loss) Gain
Beginning balance (in shares) at Dec. 31, 2017	[1]				16,885,615
Beginning balance at Dec. 31, 2017		$ 101,352			$ 57,880			$ 44,182		$ (710)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-01: reclassification of unrealized gain on junior subordinated debentures to accumulated other comprehensive income		(1,482)
Adoption of ASU 2016-01: reclassification of unrealized gain on junior subordinated debentures to accumulated other comprehensive income | ASU 2016-01		0						(1,482)		1,482
Ending balance (in shares) at Jan. 01, 2018					16,885,615
Ending balance at Jan. 01, 2018		101,352			$ 57,880			42,516		956
Beginning balance (in shares) at Dec. 31, 2017	[1]				16,885,615
Beginning balance at Dec. 31, 2017		101,352			$ 57,880			44,182		(710)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		230								230
Dividends on common stock				$ (1,520)					$ (1,520)
Restricted stock units released (in shares)							13,000
Restricted stock units released			$ 0
Stock-based compensation expense		291			$ 291
Net Income		3,156						3,156
Ending balance (in shares) at Mar. 31, 2018	[2]				16,898,615
Ending balance at Mar. 31, 2018		103,509			$ 58,171			44,152		1,186
Beginning balance (in shares) at Dec. 31, 2017	[1]				16,885,615
Beginning balance at Dec. 31, 2017		101,352			$ 57,880			44,182		(710)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common stock				(1,520)
Net Income		6,549
Ending balance (in shares) at Jun. 30, 2018	[3]				16,901,618
Ending balance at Jun. 30, 2018		105,216			$ 58,309			46,025		882
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2016-01: recognition of previously unrealized losses within marketable equity securities | ASU 2016-01		0						(184)		184
Beginning balance (in shares) at Mar. 31, 2018	[2]				16,898,615
Beginning balance at Mar. 31, 2018		103,509			$ 58,171			44,152		1,186
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		(304)								(304)
Dividends on common stock				(1,519)					(1,519)
Restricted stock units released (in shares)							3,003
Restricted stock units released			0
Stock-based compensation expense		138			$ 138
Net Income		3,392						3,392
Ending balance (in shares) at Jun. 30, 2018	[3]				16,901,618
Ending balance at Jun. 30, 2018		105,216			$ 58,309			46,025		882
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		(160)								(160)
Dividends on common stock				(1,690)					(1,690)
Restricted stock units released (in shares)							1,672
Restricted stock units released			0
Stock-based compensation expense		163			$ 163
Net Income		3,517						3,517
Ending balance (in shares) at Sep. 30, 2018	[4]				16,903,290
Ending balance at Sep. 30, 2018		107,046			$ 58,472			47,852		722
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		(48)								(48)
Dividends on common stock				(1,859)					(1,859)
Restricted stock units released (in shares)							43,332
Restricted stock units released			0
Stock-based compensation expense		152			$ 152
Net Income		$ 3,949						3,949
Ending balance (in shares) at Dec. 31, 2018		16,946,622			16,946,622	[5]
Ending balance at Dec. 31, 2018		$ 109,240			$ 58,624			49,942		674
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		(284)								(284)
Dividends on common stock				(1,869)					(1,869)
Restricted stock units released (in shares)							2,500
Restricted stock units released			0
Stock-based compensation expense		99			$ 99
Net Income		4,007						4,007
Ending balance (in shares) at Mar. 31, 2019	[6]				16,949,122
Ending balance at Mar. 31, 2019		$ 111,193			$ 58,723			52,080		390
Beginning balance (in shares) at Dec. 31, 2018		16,946,622			16,946,622	[5]
Beginning balance at Dec. 31, 2018		$ 109,240			$ 58,624			49,942		674
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common stock				(1,865)
Net Income		$ 8,104
Ending balance (in shares) at Jun. 30, 2019		16,953,744			16,953,744	[7]
Ending balance at Jun. 30, 2019		$ 113,338			$ 58,818			54,312		208
Beginning balance (in shares) at Mar. 31, 2019	[6]				16,949,122
Beginning balance at Mar. 31, 2019		111,193			$ 58,723			52,080		390
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss		(182)								(182)
Dividends on common stock				$ (1,865)					$ (1,865)
Restricted stock units released (in shares)							4,622
Restricted stock units released			$ 0
Stock-based compensation expense		95			$ 95
Net Income		$ 4,097						4,097
Ending balance (in shares) at Jun. 30, 2019		16,953,744			16,953,744	[7]
Ending balance at Jun. 30, 2019		$ 113,338			$ 58,818			$ 54,312		$ 208

[1] Excludes 46,511 unvested restricted shares

[2] Excludes 46,511 unvested restricted shares

[3] Excludes 78,508 unvested restricted shares

[4] Excludes 78,508 unvested restricted shares

[5] Excludes 59,217 unvested restricted shares

[6] Excludes 59,217 unvested restricted shares

[7] Excludes 55,713 unvested restricted shares