Fair Value Measurement - Carrying Value and Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and cash equivalents, Carrying Value	$ 110,256	$ 42,613	$ 98,522	$ 54,136
Available for sale securities, Fair value	555,188	574,562
Loans held for sale, Carrying Value	9,332	13,031
Loans, net, Carrying Value	1,008,843	1,066,240
FHLB stock, Carrying Value	26,464	26,464
Accrued interest receivable, Carrying Value	5,838	6,238
FHLB advances, Carrying Value	(50,000)	(50,000)
Repurchase agreements and other, Carrying Value	(90,588)	(90,598)
Advance payments by borrowers for taxes and insurance, Carrying Value	(13,428)	(23,590)
Accrued interest payable, Carrying Value	(597)	(563)
Carrying Value [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and cash equivalents, Carrying Value	110,256	42,613
Available for sale securities, Carrying value	555,188	574,562
Loans held for sale, Carrying Value	9,332	13,031
Loans, net, Carrying Value	1,008,843	1,066,240
FHLB stock, Carrying Value	26,464	26,464
FHLB stock, Fair Value
Accrued interest receivable, Carrying Value	5,838	6,238
Interest rate caps, Carrying Value	877	436
Checking, savings and money market accounts, Carrying Value	(907,685)	(902,776)
Certificates of deposit, Carrying Value	(526,130)	(559,298)
FHLB advances, Carrying Value	(50,000)	(50,000)
Repurchase agreements and other, Carrying Value	(90,588)	(90,598)
Advance payments by borrowers for taxes and insurance, Carrying Value	(13,428)	(23,590)
Accrued interest payable, Carrying Value	(597)	(563)
Estimate Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and cash equivalents, Fair Value	110,256	42,613
Available for sale securities, Fair value	370	313
FHLB stock, Fair Value
Checking, savings and money market accounts, Fair Value	(907,685)	(902,776)
Estimate Fair Value [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Available for sale securities, Fair value	554,818	574,249
Loans held for sale, Fair Value	9,332	13,428
FHLB stock, Fair Value
Accrued interest receivable, Fair Value	2,684	2,380
Certificates of deposit, Fair Value	(537,865)	(571,836)
FHLB advances, Fair Value	(55,892)	(57,077)
Repurchase agreements and other, Fair Value	(99,634)	(102,086)
Advance payments by borrowers for taxes and insurance, Fair Value	(13,428)	(23,590)
Accrued interest payable, Fair Value	(597)	(563)
Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Loans, net, Fair Value	1,013,912	1,087,205
FHLB stock, Fair Value
Accrued interest receivable, Fair Value	3,154	3,858
Interest rate caps, Fair Value	$ 877	$ 436

Accrued Interest Receivable Fair Value

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- Definition

Advance Payments By Borrowers For Taxes And Insurance Fair Value

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- Definition

Available For Sale Securities Carrying Value

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- Definition

Certificates Of Deposit At Fair Value

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- Definition

Deposits Money Market Deposits Fair Value

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- Definition

Interest Rate Caps Carrying Value

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Interest Rate Caps Fair Value

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Repurchase Agreements And Other

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Fair value portion of trade and related party payables and accrued expenses.

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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-SubTopic 10

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-Subparagraph (SX 210.5-02.3)

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Carrying amount of accumulated prepayments received by financial institutions from borrowers for taxes (for example, property taxes) and insurance (for example, property and catastrophe) which will periodically be remitted to the appropriate governmental agency or vendor on behalf of the borrower.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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

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-Topic 320

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-Paragraph 1

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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-Glossary Cash

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-Glossary Cash Equivalents

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The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days.

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Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount of interest-bearing domestic certificate of deposit liabilities.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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-SubTopic 10

-Glossary Loan

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Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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The fair value, as of the date of each statement of financial position presented, of loans that are restricted as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

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