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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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