Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on interest rate swaps, tax	$ 0	$ (17)	$ 1	$ 42
Reclassification adjustment for losses recognized in earnings, tax	(25)	(29)	(77)	(91)
Unrealized gains (losses) on other-than-temporarily impaired securities available for sale arising during the period, tax	0	0	(47)	276
Reclassification adjustment for realized gains included in net income, tax	0	0	484	323
Unrealized gains (loss) on other securities available for sale arising during the period, tax	433	(103)	(1,111)	(3,039)
Reclassification adjustment for realized gains included in net income, tax	$ 2	$ 0	$ 56	$ 29