Fair Value Measurements Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Pooled trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 4,088	$ 5,306
Realized adjustment to fair value		(18)
Unrealized adjustment to fair value	366	923
Sales	(3,633)	(1,888)
Discount accretion	2	4
Balance, end of period	706	4,088
Pooled trust preferred securities | Call Option [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Settlements - calls	(117)	(239)
Single-issuer trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	3,820	3,781
Realized adjustment to fair value		0
Unrealized adjustment to fair value	(230)	32
Sales	0	0
Discount accretion	10	7
Balance, end of period	2,630	3,820
Single-issuer trust preferred securities | Call Option [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Settlements - calls	(970)	0
Auction rate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	100,941	159,274
Realized adjustment to fair value		0
Unrealized adjustment to fair value	(903)	3,970
Sales	0	(11,912)
Discount accretion	467	821
Balance, end of period	98,059	100,941
Auction rate securities | Call Option [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Settlements - calls	$ (2,446)	$ (51,212)