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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
Preferred Stock [Member]
Common Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Beginning balance at Dec. 31, 2014 $ 0 $ 317,904,000 $ 10,218,000 $ 16,000 $ 328,138,000
Ending balance at Mar. 31, 2015 0 316,537,000 14,487,000 1,764,000 332,788,000
Employee stock purchase plan   10,000     10,000
Dividend reinvestment plan   140,000     140,000
Stock option exercises   132,000     132,000
Stock grants to directors for retainer fees (5,994 shares)   123,000     123,000
Stock-based compensation expense   212,000     212,000
Share repurchase program   (1,984,000)     (1,984,000)
Cash dividends     (2,377,000)   (2,377,000)
Net income     6,646,000   6,646,000
Change in net unrealized gain on securities available for sale, net of tax effect       1,876,000 1,876,000
Change in fair value of interest rate swap, net of tax effect       (128,000) (128,000)
Beginning balance at Dec. 31, 2015 0 304,819,000 27,722,000 1,263,000 333,804,000
Ending balance at Mar. 31, 2016 $ 0 302,360,000 33,697,000 2,496,000 338,553,000
Employee stock purchase plan   8,000     8,000
Dividend reinvestment plan   411,000     411,000
Stock option exercises   50,000     50,000
Stock-based compensation expense   330,000     330,000
Share repurchase program   $ (3,258,000)     (3,258,000)
Cash dividends     (2,574,000)   (2,574,000)
Net income     $ 8,549,000   8,549,000
Change in net unrealized gain on securities available for sale, net of tax effect       1,247,000 1,247,000
Change in fair value of interest rate swap, net of tax effect       $ (14,000) $ (14,000)