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Stockholders' Equity:Stock Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 25, 2015
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method			$ 4,930
Share Repurchase Program 2015 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				2,000,000
Treasury stock, shares acquired	0	0	200,000
Treasury Stock, Value, Acquired, Cost Method			$ 4,900
Treasury Stock Acquired, Average Cost Per Share			$ 24.65
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	496,989

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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