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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Preferred stock | Common stock | Additional paid-in capital | Unearned compensation | Retained earnings | Accumulated other comprehensive (loss) income | Treasury stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2016 |  |  | 35,673 |  |  |  |  |
Balance at Beginning of Period at Dec. 31, 2016 | $ 1,093,298 |  | $ 366 | $ 898,989 | $ (6,374) | $ 217,494 | $ 9,766 | $ (26,943)
Comprehensive income: |  |  |  |  |  |  |  |
Net income | 15,460 |  |  |  |  | 15,460 |  |
Other comprehensive loss | (1,908) |  |  |  |  |  | (1,908) |
Total comprehensive income | 13,552 |  |  |  |  | 15,460 | (1,908) |
Cash dividends declared on common shares | (7,506) |  |  |  |  | (7,506) |  |
Forfeited shares (in shares) |  |  | (2) |  |  |  |  |
Forfeited shares |  |  |  | 20 | 60 |  |  | (80)
Exercise of stock options (in shares) |  |  | 6 |  |  |  |  |
Exercise of stock options | 81 |  |  |  |  | (71) |  | 152
Restricted stock grants (in shares) |  |  | 81 |  |  |  |  |
Restricted stock grants |  |  |  | 807 | (2,859) |  |  | 2,052
Stock-based compensation | 1,202 |  |  |  | 1,202 |  |  |
Other, net (in shares) |  |  | (29) |  |  |  |  |
Other, net | (1,074) |  |  | 15 |  | (70) |  | (1,019)
Balance (in shares) at Mar. 31, 2017 |  |  | 35,729 |  |  |  |  |
Balance at End of Period at Mar. 31, 2017 | 1,099,553 |  | $ 366 | 899,831 | (7,971) | 225,307 | 7,858 | (25,838)
Balance (in shares) at Dec. 31, 2017 |  | 522 | 45,290 |  |  |  |  |
Balance at Beginning of Period at Dec. 31, 2017 | 1,496,264 | $ 40,633 | $ 460 | 1,242,487 | (6,531) | 239,179 | 4,161 | (24,125)
Comprehensive income: |  |  |  |  |  |  |  |
Net income | 25,248 |  |  |  |  | 25,248 |  |
Other comprehensive loss | (14,231) |  |  |  |  |  | (14,231) |
Total comprehensive income | 11,017 |  |  |  |  | 25,248 | (14,231) |
Cash dividends declared on common shares | (9,982) |  |  |  |  | (9,982) |  |
Cash dividends declared on preferred shares | (230) |  |  |  |  | (230) |  |
Forfeited shares (in shares) |  |  | (4) |  |  |  |  |
Forfeited shares |  |  |  | 31 | 125 |  |  | (156)
Exercise of stock options (in shares) |  |  | 5 |  |  |  |  |
Exercise of stock options | 76 |  |  |  |  | (73) |  | 149
Restricted stock grants (in shares) |  |  | 92 |  |  |  |  |
Restricted stock grants |  |  |  | 1,056 | (3,452) |  |  | 2,396
Stock-based compensation | 1,382 |  |  |  | 1,382 |  |  |
Other, net (in shares) |  |  | (23) |  |  |  |  |
Other, net | (870) |  |  | 16 |  |  |  | (886)
Balance (in shares) at Mar. 31, 2018 |  | 522 | 45,360 |  |  |  |  |
Balance at End of Period at Mar. 31, 2018 | $ 1,497,657 | $ 40,633 | $ 460 | $ 1,243,590 | $ (8,476) | 259,499 | (15,427) | $ (22,622)
Comprehensive income: |  |  |  |  |  |  |  |
Adoption of ASU | ASU 2016-01 |  |  |  |  |  | 6,253 | (6,253) |
Adoption of ASU | ASU 2018-02 |  |  |  |  |  | $ (896) | $ 896 |

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