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 [Member], Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Pooled Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 5,659		$ 8,356		$ 5,306		$ 6,927
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(1,394)		(3,286)		(1,394)		(3,286)
Unrealized adjustment to fair value	38	[1]	445	[1]	559	[1]	1,874	[1]
Settlements - calls	(28)		(124)		(200)		(124)
(Premium amortization) discount accretion	0	[2]	0	[2]	4	[2]	0	[2]
Balance, end of period	4,275		5,391		4,275		5,391
Single-issuer Trust Preferred Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	3,820		3,370		3,781		3,360
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0		0		0		0
Unrealized adjustment to fair value	(2)	[1]	297	[1]	36	[1]	304	[1]
Settlements - calls	0		0		0		0
(Premium amortization) discount accretion	2	[2]	3	[2]	3	[2]	6	[2]
Balance, end of period	3,820		3,670		3,820		3,670
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	147,713		154,639		159,274		149,339
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0		0		(11,912)		0
Unrealized adjustment to fair value	124	[1]	(172)	[1]	248	[1]	5,188	[1]
Settlements - calls	(1,081)		(2,066)		(1,081)		(2,408)
(Premium amortization) discount accretion	175	[2]	191	[2]	402	[2]	473	[2]
Balance, end of period	$ 146,931		$ 152,592		$ 146,931		$ 152,592

[1] Pooled trust preferred securities, single-issuer trust preferred securities and ARCs are classified as available for sale investment securities; as such, the unrealized adjustment to fair value was recorded as an unrealized holding gain (loss) and included as a component of available for sale investment securities on the consolidated balance sheets.

[2] Included as a component of net interest income on the consolidated statements of income.