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Consolidated Balance Sheets (Parenthetical)
$ in Thousands
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Statement of Financial Position [Abstract]    
Investment securities, held to maturity fair value | $ $ 201,085 $ 194,086
Allowance for loan losses | $ $ 16,394 $ 14,837
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Common stock, par value | $ / shares
Common stock, shares authorized [1] 66,000,000 66,000,000
Common stock, shares issued [1] 25,549,069 22,192,530
Common stock, shares outstanding [1] 25,529,819 22,171,596
[1] Adjusted for 3:2 stock split on November 14, 2016.