Goodwill and Core Deposit Intangibles (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2015
Goodwill
Beginning of period	$ 30,129	$ 15,672	$ 15,672
Add acquisition of SharePlus			14,457
End of the period	30,129		30,129
Core Deposit Intangibles RollForward
Beginning of period	4,148	984	984
Add acquisition of SharePlus			3,467
Less amortization	(444)	(184)	(303)
End of period	3,704		4,148
Expected future amortization expense
Finite-Lived Intangible Assets, Net, Total	4,148	$ 984	$ 984	$ 3,704
Core deposit intangibles
Core Deposit Intangibles RollForward
End of period	3,704
Expected future amortization expense
2015				146
2016				571
2017				525
2018				318
2019				271
Thereafter				1,873
Finite-Lived Intangible Assets, Net, Total	$ 3,704			$ 3,704
Core deposit intangibles | Minimum
Core Deposit Intangibles RollForward
Finite-Lived Intangible Asset, Useful Life	6 years
Core deposit intangibles | Maximum
Core Deposit Intangibles RollForward
Finite-Lived Intangible Asset, Useful Life	16 years