Fair Value of Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014 security	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	$ 235,165	$ 368,319
Available-for-sale Securities	222,835	336,589
Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquired Trust Preferred Securities, Number of Securities	17
Amortized Cost	37,066	37,146
Available-for-sale Securities	$ 24,406	$ 17,538