Other Real Estate Owned (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Changes in other real estate owned
Balance at the beginning of the year	$ 4,559	$ 5,666	$ 4,484	$ 3,355
Additions	1,566	2,974	7,406
Additions from acquisitions	7,121	2,279	0
Proceeds from dispositions	(9,914)	(6,253)	(5,987)
Gain on sales, net	23	264	587
Valuation adjustment	0	(371)	(824)
OREO covered by share-loss agreements	$ 1,200	$ 182