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Selected Quarterly Financial Data (unaudited) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net income	$ 3,390	$ 3,924	$ 807	$ 3,551	$ 7,416	$ 3,737	$ 4,630	$ 3,559	$ 11,672	$ 19,342
Earnings Per Share, Basic and Diluted	$ 0.22				$ 0.44
Interest income	$ 12,627	$ 13,242	$ 13,103	$ 13,219	$ 13,103	$ 12,965	$ 12,981	$ 13,021	52,191	$ 52,070
Equity Securities, FV-NI, Realized Gain					$ 3,600				$ 3,400
Compensation expense	$ 1,000

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. Other employee benefit expense includes, but is not limited to, service component of net periodic benefit cost for defined benefit plan. Excludes compensation cost in cost of good and service sold.

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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