Intangible Assets and Goodwill (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Core deposit intangibles and other intangible assets
Less: accumulated amortization	$ (9,480)	$ (9,140)
Net carrying amount	60	420
Core deposit intangibles
Core deposit intangibles and other intangible assets
Gross carrying amount	9,546	9,566
Less: accumulated amortization	(9,484)	(9,143)
Net carrying amount	62	423
Other intangibles
Core deposit intangibles and other intangible assets
Gross carrying amount	0	0
Less: accumulated amortization	0	0
Net carrying amount	$ 0	$ 0