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Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Preferred Stock [Member]
--- | --- | --- | --- | --- | ---
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member] | $ 67 | $ 184 | $ (117) |  |
Balance, value at Dec. 31, 2016 | 1,251,012 | $ 995,837 | 271,957 | $ (18,999) | $ 2,217
Balance, shares at Dec. 31, 2016 |  | 58,042 |  |  | 9
Net income | 56,331 |  | 56,331 |  |
Other comprehensive income | 12,471 |  |  | 12,471 |
Issuance of common stock - stock option and other plans, value | 1,155 | $ 1,155 |  |  |
Issuance of common stock - stock option and other plans, shares |  | 28 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 4,114 | $ 4,114 |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | (9)
Conversion of Stock, Amount Converted |  |  |  |  | $ (2,217)
Conversion of Stock, New Issuance |  | 102 |  |  |
Conversion of Stock, Amount Issued | 0 | $ 2,217 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, shares |  | 235 |  |  |
Stock Repurchased and Retired During Period, Value | (2,215) | $ (2,215) |  |  |
Stock Repurchased During Period, Shares |  | (54) |  |  |
Cash dividends paid on common stock | (25,621) |  | (25,621) |  |
Balance, value at Jun. 30, 2017 | 1,297,314 | $ 1,001,292 | 302,550 | (6,528) | $ 0
Balance, shares at Jun. 30, 2017 |  | 58,353 |  |  | 0
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member] | 0 |  | (157) | 157 |
Balance, value at Dec. 31, 2017 | 1,949,922 | $ 1,634,705 | 337,442 | (22,225) | $ 0
Balance, shares at Dec. 31, 2017 |  | 73,020 |  |  | 0
Net income | 81,719 |  | 81,719 |  |
Other comprehensive income | (33,853) |  |  | (33,853) |
Issuance of common stock - stock option and other plans, value | 736 | $ 736 |  |  |
Issuance of common stock - stock option and other plans, shares |  | 19 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 4,083 | $ 4,083 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, shares |  | 268 |  |  |
Stock Repurchased and Retired During Period, Value | (2,627) | $ (2,627) |  |  |
Stock Repurchased During Period, Shares |  | (62) |  |  |
Cash dividends paid on common stock | (35,105) |  | (35,105) |  |
Balance, value at Jun. 30, 2018 | 1,964,881 | $ 1,636,903 | $ 383,899 | $ (55,921) | $ 0
Balance, shares at Jun. 30, 2018 |  | 73,245 |  |  | 0
Stock Adjustment Deferred Compensation - Shares |  | 0 |  |  |
Stock Adjustment Value Deferred Compensation | $ 6 | $ 6 |  |  |

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