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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common stock and additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss)
Warrants
Warrants
Retained earnings
Balance at Dec. 31, 2014 $ 161,554 $ 59,389 $ 99,816 $ 2,349    
Balance (in shares) at Dec. 31, 2014   10,724,359        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 16,206   16,206      
Net unrealized gain (loss) on securities available for sale, net of tax (1,399)     (1,399)    
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (64)     (64)    
Unrecognized gain (loss) for post-retirement benefits, net of tax (31)     (31)    
Comprehensive income (loss) 14,712   16,206 (1,494)    
Cash dividends declared (9,349)   (9,349)      
Equity compensation expense 296 $ 296        
Payment for repurchase of common stock and warrants (180) $ (180)        
Payment for repurchase of common stock (in shares)   (10,138)        
Issuance of restricted stock (in shares)   14,179        
Proceeds from sale of common stock 465 $ 465        
Proceeds from sale of common stock (in shares)   25,455        
Balance at Dec. 31, 2015 167,498 $ 59,970 106,673 855    
Balance (in shares) at Dec. 31, 2015   10,753,855        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,503          
Net unrealized gain (loss) on securities available for sale, net of tax 1,852          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (11)          
Balance at Mar. 31, 2016 171,544          
Balance at Dec. 31, 2015 167,498 $ 59,970 106,673 855    
Balance (in shares) at Dec. 31, 2015   10,753,855        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 18,009   18,009      
Net unrealized gain (loss) on securities available for sale, net of tax (2,058)     (2,058)    
Net unrealized gain on cash flow hedging derivate instruments, net of tax 1,163     1,163    
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (17)     (17)    
Unrecognized gain (loss) for post-retirement benefits, net of tax 54     54    
Comprehensive income (loss) 17,151   18,009 (858)    
Cash dividends declared (11,110)   (11,110)      
Equity compensation expense 298 $ 298        
Payment for repurchase of common stock and warrants (129)   (129)   $ (1,750) $ (1,750)
Payment for repurchase of common stock (in shares)   (7,156)        
Tax benefit from vesting of restricted stock 32 $ 32        
Issuance of restricted stock (in shares)   21,847        
Proceeds from sale of common stock 531 $ 531        
Proceeds from sale of common stock (in shares)   25,400        
Balance at Dec. 31, 2016 $ 172,521 $ 60,831 111,693 (3)    
Balance (in shares) at Dec. 31, 2016 10,793,946 10,793,946        
Balance at Mar. 31, 2016 $ 171,544          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,624          
Net unrealized gain (loss) on securities available for sale, net of tax 1,025          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (10)          
Balance at Jun. 30, 2016 174,788          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,562          
Net unrealized gain (loss) on securities available for sale, net of tax (1,292)          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax 9          
Balance at Sep. 30, 2016 175,994          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,320          
Net unrealized gain (loss) on securities available for sale, net of tax (3,643)          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (5)          
Balance at Dec. 31, 2016 $ 172,521 $ 60,831 111,693 (3)    
Balance (in shares) at Dec. 31, 2016 10,793,946 10,793,946        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 4,637          
Net unrealized gain (loss) on securities available for sale, net of tax 1          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (4)          
Balance at Mar. 31, 2017 174,910          
Balance at Dec. 31, 2016 $ 172,521 $ 60,831 111,693 (3)    
Balance (in shares) at Dec. 31, 2016 10,793,946 10,793,946        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 19,588   19,588      
Net unrealized gain (loss) on securities available for sale, net of tax (1,452)     (1,452)    
Net unrealized gain on cash flow hedging derivative instruments, net of tax 107     107    
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (14)     (14)    
Unrecognized gain (loss) for post-retirement benefits, net of tax (19)     (19)    
Comprehensive income (loss) 18,210   19,588 (1,378)    
Cash dividends declared (10,280)   (10,280)      
Equity compensation expense 392 $ 392        
Payment for repurchase of common stock and warrants (154)   (154)      
Payment for repurchase of common stock (in shares)   (5,562)        
Reclassification adjustment for effect of enacted tax law changes     297 (297)    
Issuance of restricted stock (in shares)   18,850        
Proceeds from sale of common stock 632 $ 632        
Proceeds from sale of common stock (in shares)   22,684        
Balance at Dec. 31, 2017 $ 181,321 $ 61,855 121,144 (1,678)    
Balance (in shares) at Dec. 31, 2017 10,829,918 10,829,918        
Balance at Mar. 31, 2017 $ 174,910          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,883          
Net unrealized gain (loss) on securities available for sale, net of tax 349          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (4)          
Balance at Jun. 30, 2017 177,537          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,982          
Net unrealized gain (loss) on securities available for sale, net of tax (240)          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (3)          
Balance at Sep. 30, 2017 179,882          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 5,086          
Net unrealized gain (loss) on securities available for sale, net of tax (1,562)          
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax (3)          
Balance at Dec. 31, 2017 $ 181,321 $ 61,855 $ 121,144 $ (1,678)    
Balance (in shares) at Dec. 31, 2017 10,829,918 10,829,918