Fair Value Measurements and Derivative Instruments (Reconciliation) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Amortized cost within 1 year	$ 47,014,000
Amortized cost after 1 year through 5 years	74,649,000
Amortized cost after 5 years through 10 years	53,432,000
Amortized cost after 10 years	180,131,000
Amortized cost total	355,226,000
Estimated fair value within 1 year	46,987,000
Estimated fair value after 1 year through 5 years	75,123,000
Estimated fair value after 5 years through 10 years	53,753,000
Estimated fair value after 10 years	180,056,000
Estimated fair value total	355,919,000
Held-to-maturity Securities	$ 70,000,000	$ 0