Securities - Amortized Cost and Fair Value of Available for Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 1,353,442	$ 1,408,780
Securities available for sale, Gross Unrealized Gains	26,017	25,366
Securities available for sale, Gross Unrealized Losses	8,511	12,374
Securities Available for Sale, Fair Value	1,370,948	1,421,772
US Treasury and government agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	417	504
Securities available for sale, Gross Unrealized Gains	1	2
Securities available for sale, Gross Unrealized Losses	1	1
Securities Available for Sale, Fair Value	417	505
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	23,148	35,809
Securities available for sale, Gross Unrealized Gains	204	177
Securities available for sale, Gross Unrealized Losses	7	25
Securities Available for Sale, Fair Value	23,345	35,961
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	3,500	3,500
Securities Available for Sale, Fair Value	3,500	3,500
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	1,222,626	1,262,633
Securities available for sale, Gross Unrealized Gains	25,017	24,402
Securities available for sale, Gross Unrealized Losses	6,446	10,077
Securities Available for Sale, Fair Value	1,241,197	1,276,958
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	94,941	96,369
Securities available for sale, Gross Unrealized Losses	2,056	2,244
Securities Available for Sale, Fair Value	92,885	94,125
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	8,810	9,965
Securities available for sale, Gross Unrealized Gains	795	785
Securities available for sale, Gross Unrealized Losses	1	27
Securities Available for Sale, Fair Value	$ 9,604	$ 10,723

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

No definition available.

+ Details

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- Definition

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.

+ Details

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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)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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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

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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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