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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Held to maturity, fair value $ 189,201 $ 214,366
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, authorized shares 1,000,000 1,000,000
Preferred stock, issued shares 0 0
Preferred stock, outstanding shares 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, authorized shares 185,000,000 185,000,000
Common stock, issued shares 30,024,222 30,796,243
Common stock, outstanding shares 30,024,222 30,796,243