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Consolidated Condensed Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Retained Earnings [Member] | Treasury Stock At Cost [Member] | Accumulated Other Comprehensive Income (loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 |  | $ 0 | $ 305,826 | $ 535,631 | $ (81,472) | $ (17,745)
Net Income | $ 39,299 |  |  | 39,299 |  |
Other comprehensive income, net of tax: |  |  |  |  |  |
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes | 4,033 |  |  |  |  | 4,033
Dividends on common shares at $2.15 per share |  |  |  | (28,939) |  |
Cash payment for fractional shares in dividend reinvestment plan |  |  | (2) |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  |  | (795) | (197) | (645) |
Allocated Share-based Compensation Expense | 1,400 |  | 1,389 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | 5,425 |
Balance at Jun. 30, 2017 |  | 0 | 306,418 | 545,794 | (86,252) | (13,712)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | 3,806 |  | (3,806)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  | (995)
Balance at Dec. 31, 2017 | 756,101 | 0 | 307,726 | 561,908 | (87,079) | (26,454)
Balance (Adjustments for New Accounting Pronouncement [Member]) at Dec. 31, 2017 |  |  |  | 563,825 |  | (27,449)
Net Income | 59,364 |  |  | 59,364 |  |
Other comprehensive income, net of tax: |  |  |  |  |  |
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes | (25,778) |  |  |  |  | (23,754)
Dividends on common shares at $2.15 per share |  |  |  | (33,166) |  |
Cash payment for fractional shares in dividend reinvestment plan |  |  | (2) |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  |  | (1,597) | (317) | (1,304) |
Allocated Share-based Compensation Expense | 2,000 |  | 2,017 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | 5,784 |
Balance at Jun. 30, 2018 | $ 755,088 | $ 0 | $ 308,144 | 593,512 | $ (91,559) | $ (55,009)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2016-01 [Member] |  |  |  | $ 1,917 |  |

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