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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Unallocated Common Stock Held by ESOP [Member]
Unallocated Common Stock Held by RRP [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2015 [1] $ 165,046,354 $ 72,399 $ 76,948,914 $ (4,552,670) $ (158,590) $ 91,864,543 $ 871,758
Net income 11,726,282         11,726,282  
Other comprehensive income 732,262           732,262
Purchase of Company's common shares at cost, 12,091 shares, 1,233 shares (335,872) (121) (121,159)     (214,592)  
Cash dividends declared, $0.32 per share, $0.41 per share (2,109,790)         (2,109,790)  
Common stock issued under incentive plans, net of shares surrendered in payment, including tax benefit 3,877 shares, 7,905 shares (5,740) 39 3,442     (9,221)  
Exercise of stock options 1,176,019 902 1,175,117        
ESOP shares released for allocation 859,151   591,341 267,810      
Restricted stock vesting 5,539   (11,310)   16,849    
Share-based compensation cost 267,413   267,413        
Ending Balance at Sep. 30, 2016 177,361,618 73,219 78,853,758 (4,284,860) (141,741) 101,257,222 1,604,020
Beginning Balance at Dec. 31, 2016 [1] 179,843,024 73,502 79,425,604 (4,195,590) (119,633) 104,647,375 11,766
Net income 13,581,550         13,581,550  
Other comprehensive income 66,742           66,742
Purchase of Company's common shares at cost, 12,091 shares, 1,233 shares (48,191) (14) (11,948)     (36,229)  
Cash dividends declared, $0.32 per share, $0.41 per share (3,027,826)         (3,027,826)  
Common stock issued under incentive plans, net of shares surrendered in payment, including tax benefit 3,877 shares, 7,905 shares (15,103) 79 19,854     (35,036)  
Exercise of stock options 650,767 555 650,212        
ESOP shares released for allocation 1,183,073   915,263 267,810      
Restricted stock vesting 8,022   (5,601)   13,623    
Share-based compensation cost 382,868   382,868        
Ending Balance at Sep. 30, 2017 $ 192,624,926 $ 74,122 $ 81,376,252 $ (3,927,780) $ (106,010) $ 115,129,834 $ 78,508
[1] Balances as of December 31, 2015 and December 31, 2016 are audited.