Fair Value Measurements Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Available-for-sale Securities [Member]
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	$ 200	$ 299
Total net gain (losses) included in income:
Sales of investment securities		(99)
Ending Balance	200	200
Fair Value, Net Derivative Asset (Liability Measure on Recurring Basis, Unobservable Input Reconciliation On Net Losses Included in Income [Abstract]
Mortgage derivative gain (loss)	0	0
Derivatives [Member]
Total net gain (losses) included in income:
Sales of investment securities		0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	(488)	1,717
Fair Value, Net Derivative Asset (Liability Measure on Recurring Basis, Unobservable Input Reconciliation On Net Losses Included in Income [Abstract]
Mortgage derivative gain (loss)	2,378	(2,205)
Ending Balance	$ 1,890	$ (488)