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Consolidated Statements of Changes in Shareholders' Equity - Unaudited - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, preferred stock (shares) at Dec. 31, 2016 |  | 9,000,000 |  |  |  |  |
Beginning balance, common stock (shares) at Dec. 31, 2016 |  |  | 30,289,917 |  |  |  |
Beginning balance at Dec. 31, 2016 | $ 855,872 | $ 217,471 | $ 30,820 | $ 427,008 | $ 193,698 | $ (4,892) | $ (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 57,222 |  |  |  | 57,222 |  |
Other comprehensive income (loss) | 5,269 |  |  |  |  | 5,269 |
Preferred stock dividends | (10,844) |  |  |  | (10,844) |  |
Share-based compensation expense | 4,536 |  |  | 4,536 |  |  |
Exercise of warrants (shares) |  |  | 50,387 |  |  |  |
Exercise of warrants | 557 |  | $ 50 | 507 |  |  |
Issuance of common stock under share-based compensation arrangements (shares) |  |  | 447,328 |  |  |  |
Issuance of common stock under share-based compensation arrangements | (1,970) |  | $ 448 | (2,418) |  |  |
Ending balance, preferred stock (shares) at Sep. 30, 2017 |  | 9,000,000 |  |  |  |  |
Ending balance, common stock (shares) at Sep. 30, 2017 |  |  | 30,787,632 |  |  |  |
Ending balance at Sep. 30, 2017 | 910,642 | $ 217,471 | $ 31,318 | 429,633 | 240,076 | 377 | (8,233)
Beginning balance, preferred stock (shares) at Jun. 30, 2017 |  | 9,000,000 |  |  |  |  |
Beginning balance, common stock (shares) at Jun. 30, 2017 |  |  | 30,730,784 |  |  |  |
Beginning balance at Jun. 30, 2017 | 910,289 | $ 217,471 | $ 31,261 | 428,488 | 235,938 | 5,364 | (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 7,754 |  |  |  | 7,754 |  |
Other comprehensive income (loss) | (4,987) |  |  |  |  | (4,987) |
Preferred stock dividends | (3,615) |  |  |  | (3,615) |  |
Share-based compensation expense | 1,602 |  |  | 1,602 |  |  |
Exercise of warrants (shares) |  |  | 6,413 |  |  |  |
Exercise of warrants | 137 |  | $ 6 | 131 |  |  |
Issuance of common stock under share-based compensation arrangements (shares) |  |  | 50,435 |  |  |  |
Issuance of common stock under share-based compensation arrangements | (538) |  | $ 51 | (588) | (1) |  |
Ending balance, preferred stock (shares) at Sep. 30, 2017 |  | 9,000,000 |  |  |  |  |
Ending balance, common stock (shares) at Sep. 30, 2017 |  |  | 30,787,632 |  |  |  |
Ending balance at Sep. 30, 2017 | $ 910,642 | $ 217,471 | $ 31,318 | 429,633 | 240,076 | 377 | (8,233)
Beginning balance, preferred stock (shares) at Dec. 31, 2017 | 9,000,000 | 9,000,000 |  |  |  |  |
Beginning balance, common stock (shares) at Dec. 31, 2017 | 30,820,177 |  | 31,382,503 |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 920,964 | $ 217,471 | $ 31,913 | 422,096 | 258,076 | (359) | (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 53,833 |  |  |  | 53,833 |  |
Other comprehensive income (loss) | (18,555) |  |  |  |  | (18,555) |
Preferred stock dividends | (10,844) |  |  |  | (10,844) |  |
Share-based compensation expense | 5,641 |  |  | 5,641 |  |  |
Exercise of warrants (shares) |  |  | 5,242 |  |  |  |
Exercise of warrants | 112 |  | $ 5 | 107 |  |  |
Issuance of common stock under share-based compensation arrangements (shares) |  |  | 299,595 |  |  |  |
Issuance of common stock under share-based compensation arrangements | $ 3,661 |  | $ 300 | 3,361 |  |  |
Ending balance, preferred stock (shares) at Sep. 30, 2018 | 9,000,000 | 9,000,000 |  |  |  |  |
Ending balance, common stock (shares) at Sep. 30, 2018 | 31,687,340 |  | 31,687,340 |  |  |  |
Ending balance at Sep. 30, 2018 | $ 954,812 | $ 217,471 | $ 32,218 | 431,205 | 302,404 | (20,253) | (8,233)
Beginning balance, preferred stock (shares) at Jun. 30, 2018 |  | 9,000,000 |  |  |  |  |
Beginning balance, common stock (shares) at Jun. 30, 2018 |  |  | 31,669,643 |  |  |  |
Beginning balance at Jun. 30, 2018 | 936,227 | $ 217,471 | $ 32,200 | 428,796 | 299,990 | (33,997) | (8,233)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 6,029 |  |  |  | 6,029 |  |
Other comprehensive income (loss) | 13,744 |  |  |  |  | 13,744 |
Preferred stock dividends | (3,615) |  |  |  | (3,615) |  |
Share-based compensation expense | 1,980 |  |  | 1,980 |  |  |
Issuance of common stock under share-based compensation arrangements (shares) |  |  | 17,697 |  |  |  |
Issuance of common stock under share-based compensation arrangements | $ 447 |  | $ 18 | 429 |  |  |
Ending balance, preferred stock (shares) at Sep. 30, 2018 | 9,000,000 | 9,000,000 |  |  |  |  |
Ending balance, common stock (shares) at Sep. 30, 2018 | 31,687,340 |  | 31,687,340 |  |  |  |
Ending balance at Sep. 30, 2018 | $ 954,812 | $ 217,471 | $ 32,218 | $ 431,205 | $ 302,404 | $ (20,253) | $ (8,233)

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