Fair Value of Financial Instruments (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) security	Dec. 31, 2016 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	$ 135,746	$ 149,561
Available-for-sale Securities	$ 129,198	140,000
Collateralized debt obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquired Trust Preferred Securities, Number of Securities | security	10
Amortized Cost	$ 19,762	27,930
Available-for-sale Securities	$ 14,347	$ 20,254