Other Real Estate Owned (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Acquired Through Foreclosure [Roll Forward]
Balance at beginning of year	$ 15,504	$ 32,571	$ 37,452
Acquisitions	3,608	0	0
Additions	5,198	11,545	43,541
Capitalized improvements	0	65	75
Valuation adjustments	(224)	(3,512)	(6,724)
Dispositions	(10,532)	(25,165)	(41,773)
Balance at end of year	13,554	15,504	32,571
Valuation adjustments	(224)	(3,512)	(6,724)
Write-down due to change in appraised value	93	1,083	702
Write-down due to change in management estimates	$ 131	$ 2,429	$ 6,022