Note 11. Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Aug. 31, 2014
Preferred Stock, Shares Authorized			100,000	100,000
Preferred Stock, Par or Stated Value Per Share			1.00	1.00
Common Stock Dividends, Shares	1,638,849	[1]
Stock Issued During Period, Value, Stock Dividend	$ 15,799	[1]
Common Stock, shares authorized	23,000,000		23,000,000	23,000,000	20,000,000
IhcShareRepurchaseProgramMember
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						500,000
Treasury Stock, Shares, Acquired	100,246		296,775	334,305
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			468,218

[1] Stock dividend payable to shareholders of record on 2/17/2012 with a distribution date of 3/5/2012.