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1. Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Earnings Available to Common Shareholders
Basic earnings per common share									$ 9,177	$ 9,633	$ 9,388
Effect of dilutive securities: Restricted stock units and stock options									0	0	0
Diluted earnings per common share									$ 9,177	$ 9,633	$ 9,388
Common Shares
Basic earnings per common share (in shares)									5,477,245	5,559,235	5,615,666
Effect of dilutive securities: Restricted stock units (in shares)									70,734	47,954	26,326
Diluted earnings per common share (in shares)									5,547,979	5,607,189	5,641,992
Per Share Amount
Basic earnings per common share (in dollars per share)	$ 0.24	$ 0.45	$ 0.54	$ 0.45	$ 0.40	$ 0.45	$ 0.47	$ 0.41	$ 1.68	$ 1.73	$ 1.67
Diluted earnings per common share (in dollars per share)	$ 0.24	$ 0.44	$ 0.53	$ 0.44	$ 0.39	$ 0.45	$ 0.47	$ 0.41	$ 1.65	$ 1.72	$ 1.66

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Earnings Per Share, Per Share Amount, Reconciliation [Abstract]

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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