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Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Unallocated Common Stock Held by the Employee Stock Ownership Plan | Retained Earnings | Accumulated Other Comprehensive Income (loss) Net of tax | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (shares) at Dec. 31, 2017 |  | 48,803,885 |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | $ 638,877 | $ 609 | $ 548,864 | $ (22,244) | $ 281,138 | $ (5,451) | $ (164,039)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 10,445 |  |  |  | 10,445 |  |
Other comprehensive loss, net of tax | (4,464) |  |  |  |  | (4,464) |
ESOP shares allocated or committed to be released | 503 |  | 251 | 252 |  |  |
Stock compensation expense | 1,373 |  | 1,373 |  |  |  |
Net issuance of restricted stock (shares) |  | (600) |  |  |  |  |
Net issuance of restricted stock | 0 |  | 8 |  |  |  | (8)
Exercise of stock options, net (shares) |  | 323,594 |  |  |  |  |
Exercise of stock options, net | 725 |  | (3,652) |  |  |  | 4,377
Cash dividends declared | (4,641) |  |  |  | (4,641) |  |
Ending Balance (shares) at Mar. 31, 2018 |  | 49,126,879.000 |  |  |  |  |
Ending Balance at Mar. 31, 2018 | 642,818 | $ 609 | 546,844 | (21,992) | 286,942 | (9,915) | (159,670)
Beginning Balance (shares) at Dec. 31, 2018 |  | 49,635,673 |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | 666,439 | $ 609 | 546,219 | (20,992) | 302,544 | (9,147) | (152,794)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 8,771 |  |  |  | 8,771 |  |
Other comprehensive loss, net of tax | 6,198 |  |  |  |  | 6,198 |
ESOP shares allocated or committed to be released | 436 |  | 187 | 249 |  |  |
Stock compensation expense | $ 1,328 |  | 1,328 |  |  |  |
Exercise of stock options, net (shares) | 138,123 | 138,123 |  |  |  |  |
Exercise of stock options, net | $ 995 |  | (873) |  |  |  | 1,868
Cash dividends declared | (4,727) |  |  |  | (4,727) |  |
Ending Balance (shares) at Mar. 31, 2019 |  | 49,773,796.000 |  |  |  |  |
Ending Balance at Mar. 31, 2019 | $ 679,440 | $ 609 | $ 546,861 | $ (20,743) | $ 306,588 | $ (2,949) | $ (150,926)

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