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

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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.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.5-02.2)
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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No definition available.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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The carrying amount of held-to-maturity securities that serve as collateral for borrowings.

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The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale.

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No definition available.

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This amount represents amortized cost of securities sold during the reporting period.

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Investment securities [line items]

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Weighted-average remaining expected life of residential mortgage-backed securities available for sale

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Weighted-average remaining expected life of residential mortgage-backed securities held to maturity

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Investment Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Security	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Security
Investment Securities [Line Items]
Number of security positions in the securities held to maturity portfolio in an unrealized loss position (in security) \| Security	96		74
Fair value of investments held to maturity pledged as collateral	$ 937,200
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years	6 years 7 months
Number of security positions in the securities available for sale portfolio in an unrealized loss position (in security) \| Security	120		291
Held to Maturity, Amortized Cost	$ 1,618,466		$ 1,596,385
Amortized cost	1,449,213		1,516,937
Gross unrealized losses	9,756		16,312
Fair value of securities available for sale pledged as collateral	$ 497,600
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years	9 years 4 months 15 days
Available for sale	$ 1,452,489		1,506,861
Gross gains, Sales transactions	271	$ 3,274
Amortized Cost		25,900
Loss on Sale of Investments	0	(947)
Corporate and other debt securities
Investment Securities [Line Items]
Held to Maturity, Amortized Cost		9,800
Trust Preferred Securities Subject to Mandatory Redemption \| Previously Other-Than-Temporarily Impaired Securities
Investment Securities [Line Items]
Amortized cost	2,800
Available for sale	$ 2,100
Trust Preferred Securities \| Non-Rated
Investment Securities [Line Items]
Number of security positions in the securities held to maturity portfolio in an unrealized loss position (in security) \| Security	4
Pooled Trust Preferred Securities
Investment Securities [Line Items]
Number of security positions in the securities available for sale portfolio in an unrealized loss position (in security) \| Security	1
Amortized cost	$ 7,600
Available for sale	6,100
Pooled Trust Preferred Securities \| Investment Grade
Investment Securities [Line Items]
Gross unrealized losses	1,500
Three Private Label Mortgage-Backed Securities
Investment Securities [Line Items]
Amortized cost	11,700
Available for sale	10,800
Obligations of states and political subdivisions
Investment Securities [Line Items]
Held to Maturity, Amortized Cost	516,645		504,865
Amortized cost	124,314		125,002
Gross unrealized losses	320		441
Available for sale	126,222		124,966
Residential mortgage-backed securities
Investment Securities [Line Items]
Held to Maturity, Amortized Cost	859,305		852,289
Amortized cost	778,775		701,764
Gross unrealized losses	3,979		8,684
Available for sale	$ 782,648		$ 696,428
Pooled Trust Preferred Securities Sold
Investment Securities [Line Items]
Available for sale		2,600
Trust Preferred Securities Subject to Mandatory Redemption
Investment Securities [Line Items]
Available for sale		$ 8,300