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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Total
Purchase of treasury shares $ (19,191,000) $ (19,191,000)
Ending balance at Jun. 30, 2016 21,382,000 227,791,000 163,030,000 (74,974,000) (3,017,000) 334,212,000
Beginning balance at Dec. 31, 2015 21,382,000 227,692,000 155,647,000 (56,457,000) (5,247,000) 343,017,000
Net income 12,339,000 12,339,000
Other comprehensive income (loss) 2,230,000 2,230,000
Common dividends declared (4,956,000) (4,956,000)
Equity-based compensation expense 75,000 75,000
Common stock options exercised (23,000) 202,000 179,000
Restricted stock awards 24,000 260,000 284,000
Issuance of treasury stock to 401(k) plan 23,000 212,000 235,000
Ending balance at Jun. 30, 2016 21,382,000 227,791,000 163,030,000 (74,974,000) (3,017,000) 334,212,000
Beginning balance at Mar. 31, 2016           (5,733,000)  
Net income             6,255,000
Other comprehensive income (loss)           2,716,000 2,716,000
Purchase of treasury shares (256,000) (256,000)
Ending balance at Jun. 30, 2017 21,382,000 228,326,000 177,556,000 (78,488,000) (1,000) 348,775,000
Beginning balance at Dec. 31, 2016 21,382,000 228,142,000 170,377,000 (78,833,000) (2,011,000) 339,057,000
Net income 12,620,000 12,620,000
Other comprehensive income (loss) 2,010,000 2,010,000
Common dividends declared (5,441,000) (5,441,000)
Equity-based compensation expense 169,000 169,000
Common stock options exercised (17) 64 47
Restricted stock awards (45,000) 378,000 333,000
Issuance of treasury stock to 401(k) plan 77,000 159,000 236,000
Ending balance at Jun. 30, 2017 $ 21,382,000 $ 228,326,000 $ 177,556,000 $ (78,488,000) (1,000) 348,775,000
Beginning balance at Mar. 31, 2017           (1,481,000)  
Net income             6,418,000
Other comprehensive income (loss)           $ 1,480,000 $ 1,480,000