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

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- Definition

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

+ References

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- Definition

Number of Trust Preferred Securities

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ 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
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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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- Definition

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

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- Definition

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

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-Name Accounting Standards Codification
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- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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

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Investment Securities Narrative (Details) $ in Thousands	9 Months Ended
Investment Securities Narrative (Details) $ in Thousands	Sep. 30, 2017 USD ($) security	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)
Schedule of Investments [Line Items]
Securities pledged as collateral	$ 1,900,000	$ 1,800,000
Amortized cost	2,576,201	2,594,255
Available-for-sale Securities, Fair Value Disclosure	2,561,516	2,559,227
Single Bank Stock Investment, cost basis	4,200
Single Bank Stock Investment, Fair Value	$ 8,800
Percent Ownership In An Individual Financial Institution	73.40%
Individual Bank Stock Investment Percent to Total Portfolio	10.00%
Equity Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	$ 6,560	12,231
Available-for-sale Securities, Fair Value Disclosure	13,059	24,526
Equity Securities Financial Institution [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Equity Securities	12,100	23,500
Amortized cost	5,800
Available-for-sale Securities, Fair Value Disclosure	12,100
Other Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Equity Securities	1,000	$ 1,000
Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Unrealized Loss on Securities	$ 935
Number of Trust Preferred Securities \| security	18
External Credit Rating, BBB [Member] \| Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	$ 3,800
Available-for-sale Securities, Fair Value Disclosure	$ 2,800
Not Rated By An External Agency [Member] \| Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Number of Trust Preferred Securities \| security	2
External Credit Rating, Rated Below Investment Grade [Member] \| Single-issuer Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized cost	$ 6,900
Available-for-sale Securities, Fair Value Disclosure	$ 6,600
Number of Trust Preferred Securities \| security	5
Pooled Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 10,000		$ 10,000