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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Deferred Benefits for Directors [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 1,395,321 | $ 91,756 | $ 684,730 | $ 651,357 |  | $ (31,495) | $ (1,027)
Beginning Balance, shares at Dec. 31, 2017 |  | 44,043,244 |  |  |  |  |
Net income | 66,698 |  |  | 66,698 |  |  |
Other Comprehensive Income (Loss) | (20,794) |  |  |  |  | (20,794) |
Comprehensive income | 45,904 |  |  |  |  |  |
Common dividends declared | (26,298) |  |  | (26,298) |  |  |
Adoption of accounting standard ASU 2016-01 |  |  |  | 1,063 |  | (1,063) |
Shares issued for acquisition | 107,347 | $ 5,206 | 102,141 |  |  |  |
Shares issued for acquisition, shares |  | 2,498,761 |  |  |  |  |
Treasury shares acquired | (680) |  | 34 |  | $ (714) |  |
Treasury shares acquired, shares |  | (15,159) |  |  |  |  |
Stock options exercised | 1,143 | $ 69 | 915 |  | 159 |  |
Stock options exercised, shares |  | 36,788 |  |  |  |  |
Restricted stock granted |  | $ 166 | (166) |  |  |  |
Restricted stock granted, shares |  | 79,616 |  |  |  |  |
Stock compensation expense | 1,838 |  | 1,838 |  |  |  |
Deferred benefits for directors- net | (469) |  | (454) |  |  |  | (15)
Ending Balance at Jun. 30, 2018 | 1,524,106 | $ 97,197 | 789,038 | 692,820 | (555) | (53,352) | (1,042)
Ending Balance, shares at Jun. 30, 2018 |  | 46,643,250 |  |  |  |  |
Beginning Balance at Mar. 31, 2018 | 1,403,026 | $ 91,793 | 686,169 | 673,174 |  | (47,076) | (1,034)
Beginning Balance, shares at Mar. 31, 2018 |  | 44,060,957 |  |  |  |  |
Net income | 33,169 |  |  | 33,169 |  |  |
Other Comprehensive Income (Loss) | (6,276) |  |  |  |  | (6,276) |
Comprehensive income | 26,893 |  |  |  |  |  |
Common dividends declared | (13,523) |  |  | (13,523) |  |  |
Shares issued for acquisition | 107,347 | $ 5,206 | 102,141 |  |  |  |
Shares issued for acquisition, shares |  | 2,498,761 |  |  |  |  |
Treasury shares acquired | (680) |  | 34 |  | (714) |  |
Treasury shares acquired, shares |  | (15,159) |  |  |  |  |
Stock options exercised | 583 | $ 32 | 392 |  | 159 |  |
Stock options exercised, shares |  | 19,075 |  |  |  |  |
Restricted stock granted |  | $ 166 | (166) |  |  |  |
Restricted stock granted, shares |  | 79,616 |  |  |  |  |
Stock compensation expense | 929 |  | 929 |  |  |  |
Deferred benefits for directors- net | (469) |  | (461) |  |  |  | (8)
Ending Balance at Jun. 30, 2018 | 1,524,106 | $ 97,197 | 789,038 | 692,820 | (555) | (53,352) | (1,042)
Ending Balance, shares at Jun. 30, 2018 |  | 46,643,250 |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | 1,978,827 | $ 113,758 | 1,166,701 | 737,581 | (274) | (37,871) | (1,068)
Beginning Balance, shares at Dec. 31, 2018 |  | 54,598,134 |  |  |  |  |
Net income | 85,151 |  |  | 85,151 |  |  |
Other Comprehensive Income (Loss) | 41,984 |  |  |  |  | 41,984 |
Comprehensive income | 127,135 |  |  |  |  |  |
Common dividends declared | (33,832) |  |  | (33,832) |  |  |
Treasury shares acquired | (589) |  | 128 |  | (717) |  |
Treasury shares acquired, shares |  | (19,385) |  |  |  |  |
Stock options exercised | 121 | $ 8 | 12 |  | 101 |  |
Stock options exercised, shares |  | 6,000 |  |  |  |  |
Restricted stock granted |  | $ 186 | (1,074) |  | 888 |  |
Restricted stock granted, shares |  | 112,450 |  |  |  |  |
Stock compensation expense | 2,439 |  | 2,439 |  |  |  |
Deferred benefits for directors- net | 15 |  | 6 |  |  |  | 9
Ending Balance at Jun. 30, 2019 | 2,074,116 | $ 113,952 | 1,168,212 | 788,900 | (2) | 4,113 | (1,059)
Ending Balance, shares at Jun. 30, 2019 |  | 54,697,199 |  |  |  |  |
Beginning Balance at Mar. 31, 2019 | 2,023,139 | $ 113,758 | 1,167,761 | 761,002 | (229) | (18,098) | (1,055)
Beginning Balance, shares at Mar. 31, 2019 |  | 54,599,127 |  |  |  |  |
Net income | 44,814 |  |  | 44,814 |  |  |
Other Comprehensive Income (Loss) | 22,211 |  |  |  |  | 22,211 |
Comprehensive income | 67,025 |  |  |  |  |  |
Common dividends declared | (16,916) |  |  | (16,916) |  |  |
Treasury shares acquired | (589) |  | 128 |  | (717) |  |
Treasury shares acquired, shares |  | (19,378) |  |  |  |  |
Stock options exercised | 101 | $ 8 | 37 |  | 56 |  |
Stock options exercised, shares |  | 5,000 |  |  |  |  |
Restricted stock granted |  | $ 186 | (1,074) |  | 888 |  |
Restricted stock granted, shares |  | 112,450 |  |  |  |  |
Stock compensation expense | 1,364 |  | 1,364 |  |  |  |
Deferred benefits for directors- net | (8) |  | (4) |  |  |  | (4)
Ending Balance at Jun. 30, 2019 | $ 2,074,116 | $ 113,952 | $ 1,168,212 | $ 788,900 | $ (2) | $ 4,113 | $ (1,059)
Ending Balance, shares at Jun. 30, 2019 |  | 54,697,199 |  |  |  |  |

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