Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement [Line Items]
Available-for-sale securities, amortized cost basis	$ 2,312,087,000	$ 2,608,210,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	49,212,000	46,681,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	(37,928,000)	(86,457,000)
Available-for-sale Securities	2,323,371,000us-gaap_AvailableForSaleSecurities	2,568,434,000us-gaap_AvailableForSaleSecurities
Equity securities
Statement [Line Items]
Available-for-sale securities, amortized cost basis	33,469,000	33,922,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	14,167,000	12,355,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	(13,000)	(76,000)
Available-for-sale Securities	47,623,000	46,201,000
U.S. Government securities
Statement [Line Items]
Available-for-sale securities, amortized cost basis	200,000	525,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	0	0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	0	0
Available-for-sale Securities	200,000	525,000
U.S. Government sponsored agency securities
Statement [Line Items]
Available-for-sale securities, amortized cost basis	209,000	720,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	5,000	7,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	0	(1,000)
Available-for-sale Securities	214,000	726,000
State and municipal securities
Statement [Line Items]
Available-for-sale securities, amortized cost basis	238,250,000	281,810,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	7,231,000	6,483,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	(266,000)	(3,444,000)
Available-for-sale Securities	245,215,000	284,849,000
Corporate debt securities
Statement [Line Items]
Available-for-sale securities, amortized cost basis	99,016,000	100,468,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	5,126,000	5,685,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	(6,108,000)	(7,404,000)
Available-for-sale Securities	98,034,000	98,749,000
Collateralized mortgage obligations
Statement [Line Items]
Available-for-sale securities, amortized cost basis	917,395,000	1,069,138,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	5,705,000	8,036,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	(20,787,000)	(44,776,000)
Available-for-sale Securities	902,313,000	1,032,398,000
Mortgage-backed securities
Statement [Line Items]
Available-for-sale securities, amortized cost basis	914,797,000	949,328,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	16,978,000	13,881,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	(2,944,000)	(17,497,000)
Available-for-sale Securities	928,831,000	945,712,000
Auction rate securities
Statement [Line Items]
Available-for-sale securities, amortized cost basis	108,751,000	172,299,000
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments	0	234,000
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments	(7,810,000)	(13,259,000)
Available-for-sale Securities	$ 100,941,000	$ 159,274,000

Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

No definition available.

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Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Section 50

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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