Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 30,334	$ 30,334
Amortization of intangible assets	$ 2,609	$ 924	$ 1,089
Finite-lived intangible assets useful life	10 years	10 years
Finite-Lived Intangible Assets [Line Items]
Core deposit intangible, net, end of year	$ 11,056
Core Deposits [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived intangible assets useful life	10 years
Finite-Lived Intangible Assets [Line Items]
Gross core deposit intangible balance, beginning of year	$ 20,574	$ 9,060	$ 9,060
Acquired Finite-lived Intangible Asset, Residual Value	11,514	0
Accumulated amortization	(9,518)	(6,909)
Core deposit intangible, net, end of year	$ 11,056	$ 2,151