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Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 33,749	$ 32,565
Total gains (losses) - realized/unrealized, Included in earnings	13,766	78
Total gains (losses) - realized/unrealized, Included in other comprehensive income	5,616	6,705
Accretion included in earnings	658	3,176
Purchases
Issuances		38
Sales/redemptions	(51,527)	(1,033)
Settlements	(185)	(1,698)
Transfers from Level 3		(6,082)
Transfers into Level 3
Balance at end of period	2,077	33,749
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	31,595	22,456
Total gains (losses) - realized/unrealized, Included in earnings	13,766
Total gains (losses) - realized/unrealized, Included in other comprehensive income	5,608	6,701
Accretion included in earnings	657	3,160
Purchases
Issuances		38
Sales/redemptions	(51,527)
Settlements	(99)	(760)
Transfers from Level 3
Transfers into Level 3
Balance at end of period		31,595
Other Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		6,892
Total gains (losses) - realized/unrealized, Included in earnings		78
Total gains (losses) - realized/unrealized, Included in other comprehensive income		21
Accretion included in earnings		4
Purchases
Issuances
Sales/redemptions		(1,033)
Settlements
Transfers from Level 3		(5,962)
Transfers into Level 3
Balance at end of period
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	410	512
Total gains (losses) - realized/unrealized, Included in earnings
Total gains (losses) - realized/unrealized, Included in other comprehensive income	4	18
Accretion included in earnings
Purchases
Issuances
Sales/redemptions
Settlements
Transfers from Level 3		(120)
Transfers into Level 3
Balance at end of period	414	410
Residential Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	1,744	2,705
Total gains (losses) - realized/unrealized, Included in earnings
Total gains (losses) - realized/unrealized, Included in other comprehensive income	4	(35)
Accretion included in earnings	1	12
Purchases
Issuances
Sales/redemptions
Settlements	(86)	(938)
Transfers from Level 3
Transfers into Level 3
Balance at end of period	$ 1,663	$ 1,744

X

- Definition

Amount of accretion recorded in earnings for a financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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