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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), Net of Tax [Member] | Total
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Implementation of ASU | ASU 2014-09 [Member] |  |  | $ 453,000 |  | $ 453,000
Implementation of ASU | ASU 2016-01 [Member] |  |  | (507,000) | $ 507,000 | 0
Balance at Dec. 31, 2017 | $ 88,465,000 | $ 221,472,000 | 224,268,000 | (3,506,000) | 530,699,000
Balance (in shares) at Dec. 31, 2017 | 17,692,912 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Net income |  |  | 43,519,000 |  | 43,519,000
Other comprehensive income (loss), net of tax |  |  |  | (7,883,000) | (7,883,000)
Cash dividends declared |  |  | (18,042,000) |  | (18,042,000)
Issuance of common stock | $ 185,000 | 818,000 |  |  | 1,003,000
Issuance of common stock (in shares) | 37,017 |  |  |  |
Issuance of restricted stock | $ 57,000 | (57,000) |  |  | 0
Issuance of restricted stock (in shares) | 11,435 |  |  |  |
Vesting of restricted stock | $ (60,000) | 60,000 |  |  | 0
Vesting of restricted stock (in shares) | (11,997) |  |  |  |
Forfeiture of restricted stock | $ (6,000) | 6,000 |  |  | 0
Forfeiture of restricted stock (in shares) | (1,292) |  |  |  |
Stock-based compensation |  | 515,000 |  |  | 515,000
Balance at Sep. 30, 2018 | $ 88,641,000 | 222,814,000 | 249,691,000 | (10,882,000) | 550,264,000
Balance (in shares) at Sep. 30, 2018 | 17,728,075 |  |  |  |
Balance at Jun. 30, 2018 | $ 88,626,000 | 222,486,000 | 239,955,000 | (8,892,000) | 542,175,000
Balance (in shares) at Jun. 30, 2018 | 17,725,313 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Net income |  |  | 16,106,000 |  | 16,106,000
Other comprehensive income (loss), net of tax |  |  |  | (1,990,000) | (1,990,000)
Cash dividends declared |  |  | (6,370,000) |  | (6,370,000)
Issuance of common stock | $ 21,000 | 182,000 |  |  | 203,000
Issuance of common stock (in shares) | 3,939 |  |  |  |
Forfeiture of restricted stock | $ (6,000) | 6,000 |  |  | 0
Forfeiture of restricted stock (in shares) | (1,177) |  |  |  |
Stock-based compensation |  | 140,000 |  |  | 140,000
Balance at Sep. 30, 2018 | $ 88,641,000 | 222,814,000 | 249,691,000 | (10,882,000) | 550,264,000
Balance (in shares) at Sep. 30, 2018 | 17,728,075 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Implementation of ASU | ASU 2016-02 [Member] |  |  | (480,000) | 0 | (480,000)
Balance at Dec. 31, 2018 | $ 88,665,000 | 223,161,000 | 258,935,000 | (6,611,000) | $ 564,150,000
Balance (in shares) at Dec. 31, 2018 | 17,732,853 |  |  |  | 17,732,853
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Net income |  |  | 48,532,000 |  | $ 48,532,000
Other comprehensive income (loss), net of tax |  |  |  | 11,540,000 | 11,540,000
Cash dividends declared |  |  | (19,494,000) |  | (19,494,000)
Issuance of common stock | $ 148,000 | 533,000 |  |  | 681,000
Issuance of common stock (in shares) | 29,725 |  |  |  |
Issuance of restricted stock | $ 140,000 | (140,000) |  |  | 0
Issuance of restricted stock (in shares) | 27,921 |  |  |  |
Vesting of restricted stock | $ (64,000) | 64,000 |  |  | 0
Vesting of restricted stock (in shares) | (12,660) |  |  |  |
Forfeiture of restricted stock | $ (3,000) | 3,000 |  |  | 0
Forfeiture of restricted stock (in shares) | (588) |  |  |  |
Stock-based compensation |  | 589,000 |  |  | 589,000
Balance at Sep. 30, 2019 | $ 88,886,000 | 224,210,000 | 287,493,000 | 4,929,000 | $ 605,518,000
Balance (in shares) at Sep. 30, 2019 | 17,777,251 |  |  |  | 17,777,251
Balance at Jun. 30, 2019 | $ 88,862,000 | 223,833,000 | 278,960,000 | 3,053,000 | $ 594,708,000
Balance (in shares) at Jun. 30, 2019 | 17,772,309 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Net income |  |  | 15,269,000 |  | 15,269,000
Other comprehensive income (loss), net of tax |  |  |  | 1,876,000 | 1,876,000
Cash dividends declared |  |  | (6,736,000) |  | (6,736,000)
Issuance of common stock | $ 24,000 | 183,000 |  |  | 207,000
Issuance of common stock (in shares) | 4,942 |  |  |  |
Forfeiture of restricted stock | $ 0 | 0 |  |  | 0
Forfeiture of restricted stock (in shares) | 0 |  |  |  |
Stock-based compensation |  | 194,000 |  |  | 194,000
Balance at Sep. 30, 2019 | $ 88,886,000 | $ 224,210,000 | $ 287,493,000 | $ 4,929,000 | $ 605,518,000
Balance (in shares) at Sep. 30, 2019 | 17,777,251 |  |  |  | 17,777,251

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