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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Distributed earnings allocated to common shares									$ 1,363	$ 1,180	$ 982
Undistributed earnings allocated to common shares									8,714	6,620	5,676
Net earnings allocated to common shares									10,077	7,800	6,658
Net earnings allocated to participating securities									13	9	5
Dividends on convertible preferred shares									975	975	956
Net Income allocated to common shares and participating securities									$ 11,065	$ 8,784	$ 7,619
Weighted average shares outstanding for basic earnings per share									4,817	4,877	4,884
Dilutive effect of stock compensation									74	47	88
Dilutive effect of convertible shares									1,460	1,452	1,451
Weighted average shares outstanding for diluted earnings per share									6,351	6,376	6,423
Basic earnings per common share	$ 0.79	$ 0.52	$ 0.43	$ 0.36	$ 0.43	$ 0.47	$ 0.41	$ 0.29	$ 2.10	$ 1.60	$ 1.36
Diluted earnings per common share	$ 0.64	$ 0.43	$ 0.37	$ 0.31	$ 0.37	$ 0.4	$ 0.35	$ 0.26	$ 1.74	$ 1.38	$ 1.19

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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