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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock - Number of Shares, Shares Issued | Common Stock - Number of Shares, Treasury Shares | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 | $ 562,477 | $ 33 | $ (71,889) | $ 565,627 | $ (1,869) | $ 70,575
Beginning balance, shares issued (shares) at Dec. 31, 2017 |  | 33,083,133 |  |  |  |
Beginning balance, treasury stock (shares) at Dec. 31, 2017 |  |  | (651,506) |  |  |
Beginning balance, shares outstanding (shares) at Dec. 31, 2017 |  | 32,431,627 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 570 |  |  | 570 |  |
Stock options exercised (shares) | 25,750 | 25,750 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  | 76,313 |  |  |  |
Share-based compensation expense | 1,814 |  |  | 1,814 |  |
Restricted stock surrendered due to employee tax liability | (589) |  | $ (589) |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  | (20,172) | (20,172) |  |  |
Cash dividends declared: Common stock | (15,530) |  |  |  |  | (15,530)
Net income | 30,403 |  |  |  |  | 30,403
Change in unrealized gain (loss) on securities available for sale, net of income taxes | (7,438) |  |  |  | (7,438) |
Balance at end of period at Jun. 30, 2018 | 571,707 | $ 33 | $ (72,478) | 568,011 | (9,324) | 85,465
Ending balance, shares issued (shares) at Jun. 30, 2018 |  | 33,185,196 |  |  |  |
Ending balance, treasury stock (shares) at Jun. 30, 2018 |  |  | (671,678) |  |  |
Ending balance, shares outstanding (shares) at Jun. 30, 2018 |  | 32,513,518 |  |  |  |
Balance at beginning of period at Mar. 31, 2018 | $ 564,278 | $ 33 | $ (72,320) | 567,081 | (8,207) | 77,691
Beginning balance, shares issued (shares) at Mar. 31, 2018 |  | 33,167,768 |  |  |  |
Beginning balance, treasury stock (shares) at Mar. 31, 2018 |  |  | (665,110) |  |  |
Beginning balance, shares outstanding (shares) at Mar. 31, 2018 |  | 32,502,658 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised (shares) | 0 |  |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  | 17,428 |  |  |  |
Share-based compensation expense | 930 |  |  | 930 |  |
Restricted stock surrendered due to employee tax liability | (158) |  | $ (158) |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  | (6,568) | (6,568) |  |  |
Cash dividends declared: Common stock | (7,774) |  |  |  |  | (7,774)
Net income | 15,548 |  |  |  |  | 15,548
Change in unrealized gain (loss) on securities available for sale, net of income taxes | (1,117) |  |  |  | (1,117) |
Balance at end of period at Jun. 30, 2018 | 571,707 | $ 33 | $ (72,478) | 568,011 | (9,324) | 85,465
Ending balance, shares issued (shares) at Jun. 30, 2018 |  | 33,185,196 |  |  |  |
Ending balance, treasury stock (shares) at Jun. 30, 2018 |  |  | (671,678) |  |  |
Ending balance, shares outstanding (shares) at Jun. 30, 2018 |  | 32,513,518 |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | $ 552,568 | $ 33 | $ (108,637) | 569,712 | (6,079) | 97,539
Beginning balance, shares issued (shares) at Dec. 31, 2018 |  | 33,202,369 |  |  |  |
Beginning balance, treasury stock (shares) at Dec. 31, 2018 | (2,273,932) |  | (2,273,932) |  |  |
Beginning balance, shares outstanding (shares) at Dec. 31, 2018 |  | 30,928,437 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 22 |  |  | 22 |  |
Stock options exercised (shares) | 1,900 | 1,900 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  | 67,563 |  |  |  |
Share-based compensation expense | 1,371 |  |  | 1,371 |  |
Restricted stock surrendered due to employee tax liability | (439) |  | $ (439) |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  | (22,737) | (22,737) |  |  |
Cash dividends declared: Common stock | (14,846) |  |  |  |  | (14,846)
Net income | 17,328 |  |  |  |  | 17,328
Change in unrealized gain (loss) on securities available for sale, net of income taxes | 8,454 |  |  |  | 8,454 |
Balance at end of period at Jun. 30, 2019 | $ 564,458 | $ 33 | $ (109,076) | 571,105 | 2,375 | 100,021
Ending balance, shares issued (shares) at Jun. 30, 2019 |  | 33,271,832 |  |  |  |
Ending balance, treasury stock (shares) at Jun. 30, 2019 | (2,296,669) |  | (2,296,669) |  |  |
Ending balance, shares outstanding (shares) at Jun. 30, 2019 |  | 30,975,163 |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | $ 564,292 | $ 33 | $ (109,062) | 570,432 | (1,882) | 104,771
Beginning balance, shares issued (shares) at Mar. 31, 2019 |  | 33,153,888 |  |  |  |
Beginning balance, treasury stock (shares) at Mar. 31, 2019 |  |  | (2,293,355) |  |  |
Beginning balance, shares outstanding (shares) at Mar. 31, 2019 |  | 30,860,533 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 13 |  |  | 13 |  |
Stock options exercised (shares) | 1,250 | 1,250 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  | 116,694 |  |  |  |
Share-based compensation expense | 660 |  |  | 660 |  |
Restricted stock surrendered due to employee tax liability | (14) |  | $ (14) |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  | (3,314) | (3,314) |  |  |
Cash dividends declared: Common stock | (7,406) |  |  |  |  | (7,406)
Net income | 2,656 |  |  |  |  | 2,656
Change in unrealized gain (loss) on securities available for sale, net of income taxes | 4,257 |  |  |  | 4,257 |
Balance at end of period at Jun. 30, 2019 | $ 564,458 | $ 33 | $ (109,076) | $ 571,105 | $ 2,375 | $ 100,021
Ending balance, shares issued (shares) at Jun. 30, 2019 |  | 33,271,832 |  |  |  |
Ending balance, treasury stock (shares) at Jun. 30, 2019 | (2,296,669) |  | (2,296,669) |  |  |
Ending balance, shares outstanding (shares) at Jun. 30, 2019 |  | 30,975,163 |  |  |  |

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant