Fair Value Measurements Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale Securities [Member]
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	$ 299	$ 480
Total net gain (losses) included in income:
Sale of investment securities	(99)	(111)
Total net gains included in other comprehensive income
Investment securities gains	0	(70)
Ending Balance	200	299
Derivatives [Member]
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	1,717	7,647
Total net gain (losses) included in income:
Mortgage derivative gain (loss), net	(2,205)	(5,930)
Total net gains included in other comprehensive income
Ending Balance	$ (488)	$ 1,717