Guaranteed Preferred Beneficial Interests in Company's Junior Subordinated Deferrable Interest Debentures (Trust-Preferred Securities) and Interest Rate Swaps (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Interest rate swap agreements	Dec. 31, 2013 Interest rate swap agreements
Guaranteed Preferred Beneficial Interests in the Company's Junior Subordinated Deferrable Interest Debentures (Trust Preferred Securities) and Interest Rate Swaps
Hedge ineffectiveness for swaps	$ 0
Liability Derivatives, Included in Other Liabilities
Fair value		7,651	8,037
Notional amount		75,000	75,000
Collateral posted		$ 8,355	$ 8,405