Investment Securities Narrative (Details)	12 Months Ended
Dec. 31, 2016 USD ($) Security	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)
Available-for-sale securities pledged as collateral	$ 1,800,000,000		$ 1,700,000,000
Available-for-sale securities, amortized cost basis	2,594,255,000		2,494,059,000
Single bank stock investment, cost basis	5,800,000
Bank stock investment, fair value	$ 11,900,000
Percent ownership in an individual financial institution	50.50%
Individual bank stock investment percent to total portfolio	10.00%
Other than temporary impairment losses, investments, portion recognized in earnings, net, available-for-sale securities	$ 0	$ 30,000
Securities available for sale	2,559,227,000		2,484,773,000
Domestic corporate debt securities	109,400,000
Equity Securities Financial Institution
Available-for-sale securities, equity securities	23,500,000		20,600,000
Available-for-sale securities, amortized cost basis	11,500,000
Equity Securities, Miscellaneous
Available-for-sale securities, equity securities	1,003,000		900,000
Auction rate securities
Available-for-sale securities, amortized cost basis	107,215,000		106,772,000
Securities available for sale	97,256,000		$ 98,059,000
Auction rate securities \| External Credit Rated AAA
Carrying value auction rate securities rated AAA	$ 5,500,000
Percentage auction rate securities rated AAA	6.00%
Auction rate securities \| External Credit Rating, Rated Above Investment Grade
Carrying value auction rate securities rated AAA	$ 91,800,000
Percentage auction rate securities rated AAA	94.00%
Single-issuer trust preferred securities
Unrealized gain (loss) on securities	$ (3,900,000)
Number of securities \| Security	19
Single-issuer trust preferred securities \| External Credit Rating, Rated Below Investment Grade
Available-for-sale securities, amortized cost basis	$ 11,500,000
Securities available for sale	$ 10,000,000
Number of trust preferred securities	6
Single-issuer trust preferred securities \| External Credit Rating, BBB
Available-for-sale securities, amortized cost basis	$ 3,700,000
Securities available for sale	$ 2,500,000

Investment in the common stock of an individual financial institution, at fair value.

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Carrying value of auction rate securities with credit ratings of AAA.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by corporate entities.

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Percentage which none of the fair values of Corporation's individual bank stock investments exceed the fair value of the entire portfolio.

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Number Of Securities

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Number of Trust Preferred Securities Below Investment Grade.

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Fair value of ownership in a single financial institution as a percentage of the Corporation's entire financial institutions stock portfolio.

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Percentage of auction rate securities with credit ratings of AAA.

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Investment in the common stock of an individual financial institution, at cost.

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

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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