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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Capital Stock [Member]
Surplus [Member]
Undivided Profits [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2016 $ 99,214 $ 171,425 $ 201,517 $ (6,251) $ (33,219) $ 432,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 0 0 23,187 0 0 23,187
Other comprehensive income (loss), net of tax 0 0 0 2,658 0 2,658
Cash dividend declared 0 0 (12,592) 0 0 (12,592)
Stock options exercised 297 1,298 0 0 0 1,595
Purchase of treasury stock 0 0 0 0 (1,503) (1,503)
Sale of treasury stock 0 (199) 0 0 1,455 1,256
Stock based compensation expense 0 79 0 0 0 79
Balance at Jun. 30, 2017 99,511 172,603 212,112 (3,593) (33,267) 447,366
Balance at Mar. 31, 2017       (5,568)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income           12,240
Other comprehensive income (loss), net of tax           1,975
Balance at Jun. 30, 2017 99,511 172,603 212,112 (3,593) (33,267) 447,366
Balance at Dec. 31, 2017 99,998 175,651 219,436 (1,806) (34,971) 458,308
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 0 0 30,213 0 0 30,213
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect 0 0 1,346 (1,346) 0 0
Other comprehensive income (loss), net of tax 0 0 0 (6,644) 0 (6,644)
Cash dividend declared 0 0 (12,653) 0 0 (12,653)
Stock options exercised 95 608 0 0 0 703
Purchase of treasury stock 0 0 0 0 (379) (379)
Sale of treasury stock 0 (93) 0 0 1,283 1,190
Stock based compensation expense 0 77 0 0 0 77
Balance at Jun. 30, 2018 100,093 176,243 238,342 (9,796) (34,067) 470,815
Balance at Mar. 31, 2018       (8,490)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income           15,405
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect       (1,346)    
Other comprehensive income (loss), net of tax           (1,306)
Balance at Jun. 30, 2018 $ 100,093 $ 176,243 $ 238,342 $ (9,796) $ (34,067) $ 470,815