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
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Other comprehensive income (loss), tax $ 4,540 $ 3,411
Issuance of common stock, acquisition, shares   17,232
Dividends on common stock, per share (in usd per share) $ 0.4 $ 0.38
Stock purchased under stock repurchase plan, shares   1,312,556
Issuance of common stock under Equity Compensation Plan , shares 31,818 34,227
Issuance of common stock for services rendered, shares 11,320 9,552
Vesting of restricted stock under Equity Compensation Plans, shares 59,426 31,993