Employee Benefits and Stock Compensation - Summary of Stock Options Outstanding and Exercisable (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options / SSARs Outstanding, Number of Shares Outstanding	493,000	102,000	87,000	107,000
Options / SSARs Outstanding, Weighted Average Remaining Contractual Life in Years	8 years 7 months 13 days
Options / SSARs Exercisable (Vested), Number of Shares Exercisable	101,000
Options / SSARs Exercisable (Vested), Weighted Average Exercise Price	$ 49.73
Options / SSARs Exercisable (Vested), Weighted Average Remaining Contractual Life in Years	6 years 5 months 26 days
Options / SSARs Exercisable (Vested), Aggregate Intrinsic Value	$ 188,000