Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands		Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Statement of Partners' Capital [Abstract]
Investment securities, held to maturity fair value | $		$ 202,222	$ 194,086
Allowance for loan losses | $		$ 15,586	$ 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]	23,344,709	22,192,530
Common stock, shares outstanding	[1]	23,325,459	22,171,596

[1] Adjusted for 3:2 stock split on November 14, 2016.