Fair Value of Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 security	Dec. 31, 2014	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	$ 234,683	$ 231,745
Available-for-sale Securities	227,795	221,117	221,117
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	37,399	37,117
Available-for-sale Securities	$ 28,391	$ 25,339