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Consolidated Statements Of Changes In Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance at Dec. 31, 2008 $ 12,913 $ 65,890 $ (9,332) $ (7,004) $ 62,467
Comprehensive income:          
Net income   8,512     8,512
Other comprehensive income (loss):          
Net change in unrealized losses on available for sale securities, net of reclassification and taxes       2,063 2,063
Change in actuarial gain, net of amortization and tax effects forpost-employment health care plan, net of tax       (138) (138)
Change in fair value of interest rate swap agreements designatedas a cash flow hedge, net of tax       204 204
Total other comprehensive income (loss)         2,129
Total comprehensive income         10,641
Restricted stock award grants (198)   198    
Forfeiture of restricted stock award grants 17   (17)    
Exercise of stock options, including tax benefit (125)   886   761
Stock based compensation expense 122       122
Reissue of treasury stock (98)   1,242   1,144
Cash dividends declared ($0.66 per share)   (5,726)     (5,726)
Ending Balance at Dec. 31, 2009 12,631 68,676 (7,023) (4,875) 69,409
Comprehensive income:          
Net income   11,316     11,316
Other comprehensive income (loss):          
Net change in unrealized losses on available for sale securities, net of reclassification and taxes       2,554 2,554
Change in actuarial gain, net of amortization and tax effects forpost-employment health care plan, net of tax       (245) (245)
Change in fair value of interest rate swap agreements designatedas a cash flow hedge, net of tax       (107) (107)
Total other comprehensive income (loss)         2,202
Total comprehensive income               
Common shares issued (3,365,853 shares) 32,128       13,518
Restricted stock award grants (233)   233   32,128
Forfeiture of restricted stock award grants 20   (20)    
Exercise of stock options, including tax benefit (37)   121   84
Stock based compensation expense 205       205
Reissue of treasury stock (38)   1,272   1,234
Cash dividends declared ($0.66 per share)   (6,933)     (6,933)
Ending Balance at Dec. 31, 2010 44,676 73,059 (5,417) (2,673) 109,645
Comprehensive income:          
Net income   15,104     15,104
Other comprehensive income (loss):          
Net change in unrealized losses on available for sale securities, net of reclassification and taxes     14,441   14,441
Change in actuarial gain, net of amortization and tax effects forpost-employment health care plan, net of tax       (485) (485)
Change in fair value of interest rate swap agreements designatedas a cash flow hedge, net of tax       (522) (522)
Total other comprehensive income (loss)         13,434
Total comprehensive income               
Restricted stock award grants (266)   266    
Forfeiture of restricted stock award grants 22   (22)    
Exercise of stock options, including tax benefit (133)   443   310
Stock based compensation expense 213       213
Reissue of treasury stock (162)   1,470   1,308
Cash dividends declared ($0.66 per share)   (8,125)     (8,125)
Ending Balance at Dec. 31, 2011 $ 44,350 $ 80,038 $ (3,260) $ 10,761 $ 131,889