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Fair Value Disclosures of Financial Assets - Balances of Assets Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	$ 829,341	$ 907,498
Total assets measured at fair value on a recurring basis	841,931	920,088
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis	6,522	4,622
Assets Measured at Fair Value on a Nonrecurring Basis	52,600	52,900
Total assets measured at fair value on a nonrecurring basis	59,171	57,526
Collateralized Mortgage Obligation ("CMO") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	176,084	259,396
Federal National Mortgage Association ("FNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	367,334	406,255
Federal Home Loan Mortgage Corporation ("FHLMC") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	90,187	59,650
Government National Mortgage Association ("GNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	125,661	132,455
U.S. Government and agencies [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	46,923	46,990
State and political subdivisions [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	23,577	3,209
Reverse Mortgages [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	(425)	(457)
Trading securities [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	12,590	12,590
Other real estate owned [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis	6,522	4,622
Impaired Loans [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis	52,649	52,904
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member]
Available-for-sale securities:
Total assets measured at fair value on a recurring basis
Assets Measured at Fair Value on a Nonrecurring Basis
Total assets measured at fair value on a nonrecurring basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Collateralized Mortgage Obligation ("CMO") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Federal National Mortgage Association ("FNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Federal Home Loan Mortgage Corporation ("FHLMC") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Government National Mortgage Association ("GNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| U.S. Government and agencies [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| State and political subdivisions [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Reverse Mortgages [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Trading securities [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Other real estate owned [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis
Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] \| Impaired Loans [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis
Significant Other Observable Inputs (Level 2) [Member]
Available-for-sale securities:
Total assets measured at fair value on a recurring basis	823,643	900,859
Assets Measured at Fair Value on a Nonrecurring Basis
Total assets measured at fair value on a nonrecurring basis
Significant Other Observable Inputs (Level 2) [Member] \| Collateralized Mortgage Obligation ("CMO") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	169,961	252,300
Significant Other Observable Inputs (Level 2) [Member] \| Federal National Mortgage Association ("FNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	367,334	406,255
Significant Other Observable Inputs (Level 2) [Member] \| Federal Home Loan Mortgage Corporation ("FHLMC") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	90,187	59,650
Significant Other Observable Inputs (Level 2) [Member] \| Government National Mortgage Association ("GNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	125,661	132,455
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Government and agencies [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	46,923	46,990
Significant Other Observable Inputs (Level 2) [Member] \| State and political subdivisions [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	23,577	3,209
Significant Other Observable Inputs (Level 2) [Member] \| Reverse Mortgages [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Significant Other Observable Inputs (Level 2) [Member] \| Trading securities [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Significant Other Observable Inputs (Level 2) [Member] \| Other real estate owned [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis
Significant Other Observable Inputs (Level 2) [Member] \| Impaired Loans [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis
Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities:
Total assets measured at fair value on a recurring basis	18,288	19,229
Assets Measured at Fair Value on a Nonrecurring Basis
Total assets measured at fair value on a nonrecurring basis	59,171	57,526
Significant Unobservable Inputs (Level 3) [Member] \| Collateralized Mortgage Obligation ("CMO") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	6,123	7,096
Significant Unobservable Inputs (Level 3) [Member] \| Federal National Mortgage Association ("FNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Significant Unobservable Inputs (Level 3) [Member] \| Federal Home Loan Mortgage Corporation ("FHLMC") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Significant Unobservable Inputs (Level 3) [Member] \| Government National Mortgage Association ("GNMA") [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Significant Unobservable Inputs (Level 3) [Member] \| U.S. Government and agencies [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Significant Unobservable Inputs (Level 3) [Member] \| State and political subdivisions [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis
Significant Unobservable Inputs (Level 3) [Member] \| Reverse Mortgages [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	(425)	(457)
Significant Unobservable Inputs (Level 3) [Member] \| Trading securities [Member]
Available-for-sale securities:
Assets Measured at Fair Value on a Recurring Basis	12,590	12,590
Significant Unobservable Inputs (Level 3) [Member] \| Other real estate owned [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis	6,522	4,622
Significant Unobservable Inputs (Level 3) [Member] \| Impaired Loans [Member]
Assets Measured at Fair Value on a Nonrecurring Basis
Assets Measured at Fair Value on a Nonrecurring Basis	$ 52,649	$ 52,904

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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