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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 | $ 61,411 |  |  | 61,411 |  |
Other comprehensive income, net of tax: |  |  |  |  |  |
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes | 4,740 |  |  |  |  | 4,740
Dividends on common shares at $3.11 per share |  |  |  | (43,411) |  |
Cash payment for fractional shares in dividend reinvestment plan |  |  | (4) |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  |  | (795) | (197) | (645) |
Allocated Share-based Compensation Expense | 2,100 |  | 2,116 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | 7,378 |
Balance at Sep. 30, 2017 |  | 0 | 307,143 | 553,434 | (88,205) | (13,005)
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] |  |  |  | 1,917 |  | (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 | 84,126 |  |  | 84,126 |  |
Other comprehensive income, net of tax: |  |  |  |  |  |
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes | (30,919) |  |  |  |  | (28,895)
Dividends on common shares at $3.11 per share |  |  |  | (48,349) |  |
Cash payment for fractional shares in dividend reinvestment plan |  |  | (3) |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | 48,519 |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures |  |  | (1,597) | (317) | (1,304) |
Allocated Share-based Compensation Expense | 3,100 |  | 3,064 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | 5,784 |
Balance at Sep. 30, 2018 | $ 809,091 | $ 0 | $ 357,709 | $ 603,091 | $ (91,559) | $ (60,150)

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