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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Treasury Stock [Member] | Accumulated Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 409,762 | $ 205 | $ 211,431 | $ (22,370) | $ 221,328 | $ (832)
Beginning Balance (ASU 2016-02 [Member]) at Dec. 31, 2018 | (1) |  |  |  | (1) |
Beginning Balance, Shares at Dec. 31, 2018 |  | 20,528,230 |  | (1,258,250) |  |
Comprehensive income: |  |  |  |  |  |
Net income | 58,676 |  |  |  | 58,676 |
Other comprehensive income: |  |  |  |  |  |
Change in unrealized gains (losses), net of tax | 13,447 |  |  |  |  | 13,447
Comprehensive income | 72,123 |  |  |  |  |
Common stock issued upon exercise of options | $ 20 |  | 20 |  |  |
Common stock issued upon exercise of options, Shares | 5,000 | 5,000 |  |  |  |
Common stock issued | $ 559 |  | 559 |  |  |
Common stock issued, Shares |  | 25,329 |  |  |  |
Share-based compensation | 733 |  | 733 |  |  |
Dividends to shareholders | (14,467) |  |  |  | (14,467) |
Ending Balance at Sep. 30, 2019 | 468,729 | $ 205 | 212,743 | $ (22,370) | 265,536 | 12,615
Ending Balance, Shares at Sep. 30, 2019 |  | 20,558,559 |  | (1,258,250) |  |
Beginning Balance at Jun. 30, 2019 | 449,443 | $ 205 | 212,493 | $ (22,370) | 248,975 | 10,140
Beginning Balance, Shares at Jun. 30, 2019 |  | 20,556,511 |  | (1,258,250) |  |
Comprehensive income: |  |  |  |  |  |
Net income | 21,386 |  |  |  | 21,386 |
Other comprehensive income: |  |  |  |  |  |
Change in unrealized gains (losses), net of tax | 2,475 |  |  |  |  | 2,475
Comprehensive income | 23,861 |  |  |  |  |
Common stock issued | (1) |  | (1) |  |  |
Common stock issued, Shares |  | 2,048 |  |  |  |
Share-based compensation | 251 |  | 251 |  |  |
Dividends to shareholders | (4,825) |  |  |  | (4,825) |
Ending Balance at Sep. 30, 2019 | 468,729 | $ 205 | 212,743 | $ (22,370) | 265,536 | 12,615
Ending Balance, Shares at Sep. 30, 2019 |  | 20,558,559 |  | (1,258,250) |  |
Beginning Balance at Dec. 31, 2019 | 430,215 | $ 205 | 213,004 | $ (22,370) | 227,165 | 12,211
Beginning Balance (ASU 2016-13 [Member]) at Dec. 31, 2019 | $ (594) |  |  |  | (594) |
Beginning Balance, Shares at Dec. 31, 2019 | 19,302,583 | 20,560,833 |  | (1,258,250) |  |
Comprehensive income: |  |  |  |  |  |
Net income | $ 58,101 |  |  |  | 58,101 |
Other comprehensive income: |  |  |  |  |  |
Change in unrealized gains (losses), net of tax | 7,701 |  |  |  |  | 7,701
Comprehensive income | $ 65,802 |  |  |  |  |
Common stock issued upon exercise of options, Shares | 0 |  |  |  |  |
Common stock issued | $ 1,360 | $ 1 | 1,359 |  |  |
Common stock issued, Shares |  | 28,476 |  |  |  |
Share-based compensation | 777 |  | 777 |  |  |
Dividends to shareholders | (15,650) |  |  |  | (15,650) |
Ending Balance at Sep. 30, 2020 | $ 481,910 | $ 206 | 215,140 | $ (22,370) | 269,022 | 19,912
Ending Balance, Shares at Sep. 30, 2020 | 19,331,059 | 20,589,309 |  | (1,258,250) |  |
Beginning Balance at Jun. 30, 2020 | $ 462,796 | $ 206 | 214,894 | $ (22,370) | 250,888 | 19,178
Beginning Balance, Shares at Jun. 30, 2020 |  | 20,589,309 |  | (1,258,250) |  |
Comprehensive income: |  |  |  |  |  |
Net income | 23,353 |  |  |  | 23,353 |
Other comprehensive income: |  |  |  |  |  |
Change in unrealized gains (losses), net of tax | 734 |  |  |  |  | 734
Comprehensive income | 24,087 |  |  |  |  |
Share-based compensation | 246 |  | 246 |  |  |
Dividends to shareholders | (5,219) |  |  |  | (5,219) |
Ending Balance at Sep. 30, 2020 | $ 481,910 | $ 206 | $ 215,140 | $ (22,370) | $ 269,022 | $ 19,912
Ending Balance, Shares at Sep. 30, 2020 | 19,331,059 | 20,589,309 |  | (1,258,250) |  |

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