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Nature of Operations and Summary of Significant Accounting Policies - Stock Compensation Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nature of Operations and Summary of Significant Accounting Policies      
Share-based Payment Arrangement, Expense $ 1,200,000 $ 922,000 $ 737,000