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, 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	6	(111)
Total net losses included in other comprehensive income
Unrealized investment securities gains (losses)	(78)	(70)
Ending Balance	227	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	(414)	(5,930)
Total net losses included in other comprehensive income
Ending Balance	$ 1,303	$ 1,717