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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 | 29,199 |  | 29,199 |  |
Other comprehensive income | 6,393 |  |  | 6,393 |
Issuance of common stock - stock option and other plans, value | 1,145 | $ 1,145 |  |  |
Issuance of common stock - stock option and other plans, shares |  | 28 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 2,358 | $ 2,358 |  |  |
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 |  | 207 |  |  |
Stock Repurchased and Retired During Period, Value | (2,039) | $ (2,039) |  |  |
Stock Repurchased During Period, Shares |  | (50) |  |  |
Cash dividends paid on common stock | (12,792) |  | (12,792) |  |
Balance, value at Mar. 31, 2017 | 1,275,343 | $ 999,702 | 288,247 | (12,606) | $ 0
Balance, shares at Mar. 31, 2017 |  | 58,329 |  |  | 0
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member] | (46) |  | (203) | 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 | 39,970 |  | 39,970 |  |
Other comprehensive income | (26,065) |  |  | (26,065) |
Issuance of common stock - stock option and other plans, value | 719 | $ 719 |  |  |
Issuance of common stock - stock option and other plans, shares |  | 17 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, value | 2,064 | $ 2,064 |  |  |
Issuance of common stock - restricted stock awards, net of cancelled awards, shares |  | 263 |  |  |
Stock Repurchased and Retired During Period, Value | (2,575) | $ (2,575) |  |  |
Stock Repurchased During Period, Shares |  | (60) |  |  |
Cash dividends paid on common stock | (16,069) |  | (16,069) |  |
Balance, value at Mar. 31, 2018 | 1,947,923 | $ 1,634,916 | $ 361,140 | $ (48,133) | $ 0
Balance, shares at Mar. 31, 2018 |  | 73,240 |  |  | 0
Stock Adjustment Deferred Compensation - Shares |  | 0 |  |  |
Stock Adjustment Value Deferred Compensation | $ 3 | $ 3 |  |  |

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