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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Available-for-sale investment securities, Amortized cost $ 538,692 $ 548,640
Loans, allowance for credit losses $ 8,778 $ 9,326
Preferred stock, liquidation preference (in dollars per share) $ 1,000 $ 1,000
Preferred stock, authorized (in shares) 10,000,000 10,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Preferred stock, par value (in dollars per share) $ 0 $ 0
Common Stock, authorized (in shares) 80,000,000 80,000,000
Common Stock, issued (in shares) 13,696,722 12,143,815
Common Stock, outstanding (in shares) 13,696,722 12,143,815
Common stock, par value (in dollars per share) $ 0 $ 0