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Statement of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid in Capital
Retained Earnings
Unallocated ESOP Shares
Accumulated Other Comprensive Income (Loss)
Treasury Stock
Stockholder's Equity Beginning Balance at Dec. 31, 2009$ 140,818$ 15,170$ 178,192$ 24,100$ (2,204)$ (6,640)$ (67,800)
Shares,Issued, Beginning Balance at Dec. 31, 2009 15,170,399  105,167 4,147,811
Net Income16,704  16,704   
Net Unrealized Securities Holding Gains Arising During the Period, Net of Tax4,841    4,841 
Reclassification Adjustment for Net Securities Gains Included in Net Income, Net of Tax(903)    (903) 
Amortization of Net Retirement Plan Actuarial Loss456    456 
Accretion of Net Retirement Plan Prior Service Credit(80)    (80) 
3% Stock Dividend 4569,962(10,418)   
3% Stock Dividend,share 455,113  3,855 124,042
Cash Dividends Paid(8,202)  (8,202)   
Stock Options Exercised319 94   225
Stock Options Exercised,share      (26,518)
Shares Issued Under the Directors' Stock Plan74 50   24
Shares Issued Under the Directors' Stock Plan,share      (2,866)
Shares Issued Under the Employee Stock Purchase Plan341 220   121
Shares Issued Under the Employee Stock Purchase Plan,share      (14,217)
Tax Benefit for Disposition of Stock Options67 67    
Treasury Shares Issued for Dividend Reinvestment Plans1,266 842   424
Treasury Shares Issued for Dividend Reinvestment Plans,share      (49,982)
Stock-Based Compensation Expense226 226    
Purchases of Treasury Stock(2,595)     (2,595)
Purchases of Treasury Stock,share      106,761
Shares Issued for Acquisition of Subsidiary682 459   223
Shares Issued for Acquisition of Subsidiary,share      (26,240)
Acquisition by ESOP of Arrow Stock(1,000)   (1,000)  
Acquisition by ESOP of Arrow Stock,share    40,890  
Allocation of ESOP Stock443 115 328  
Allocation of ESOP Stock,share    (17,616)  
Stockholder's Equity Ending Balance at Sep. 30, 2010153,45715,626190,22722,184(2,876)(2,326)(69,378)
Shares,Issued, Ending Balance at Sep. 30, 2010 15,625,512  132,296 4,258,791
Stockholder's Equity Beginning Balance at Dec. 31, 2010152,25915,626191,06824,577(2,876)(6,423)(69,713)
Shares,Issued, Beginning Balance at Dec. 31, 2010 15,625,512  132,296 4,237,435
Net Income16,502  16,502   
Net Unrealized Securities Holding Gains Arising During the Period, Net of Tax4,900    4,900 
Reclassification Adjustment for Net Securities Gains Included in Net Income, Net of Tax(1,688)    (1,688) 
Amortization of Net Retirement Plan Actuarial Loss464    464 
Accretion of Net Retirement Plan Prior Service Credit(58)    (58) 
3% Stock Dividend 46810,646(11,114)   
3% Stock Dividend,share 468,765  3,422 122,779
Cash Dividends Paid(8,513)  (8,513)   
Stock Options Exercised853 462   391
Stock Options Exercised,share      (40,986)
Shares Issued Under the Directors' Stock Plan88 55   33
Shares Issued Under the Directors' Stock Plan,share      (3,634)
Shares Issued Under the Employee Stock Purchase Plan348 212   136
Shares Issued Under the Employee Stock Purchase Plan,share      (14,744)
Tax Benefit for Disposition of Stock Options21 21    
Treasury Shares Issued for Dividend Reinvestment Plans1,329 798   531
Treasury Shares Issued for Dividend Reinvestment Plans,share      (56,097)
Stock-Based Compensation Expense266 266    
Purchases of Treasury Stock(3,892)     (3,892)
Purchases of Treasury Stock,share      160,445
Shares Issued for Acquisition of Subsidiary5,317 3,300   2,017
Shares Issued for Acquisition of Subsidiary,share      (224,641)
Acquisition by ESOP of Arrow Stock0      
Allocation of ESOP Stock428 52 376  
Allocation of ESOP Stock,share    (18,216)  
Stockholder's Equity Ending Balance at Sep. 30, 2011$ 168,624$ 16,094$ 206,880$ 21,452$ (2,500)$ (2,805)$ (70,497)
Shares,Issued, Ending Balance at Sep. 30, 2011 16,094,277  117,502 4,180,557