Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical)

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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Statement of Stockholders' Equity [Abstract]    
Other comprehensive income (loss), tax $ 3,970 $ 1,130
Issuance of common stock, acquisition, shares 17,232  
Dividends on common stock, per share (in usd per share) $ 0.57 $ 0.49
Stock purchased under stock repurchase plan, shares 1,411,131 347,021
Issuance of common stock under Dividend Reinvestment Plans, shares   52,201
Issuance of common stock under Equity Compensation Plan , shares 54,044 37,124
Issuance of common stock for services rendered, shares 14,576 19,417
Vesting of restricted stock under Equity Compensation Plans, shares 35,515 26,576