Fair Value Measurement - Carrying Value and Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and cash equivalents, Carrying Value	$ 29,590	$ 77,331	$ 86,130	$ 42,613
Loans held for sale, Carrying Value	10,567	4,838
Loans, net, Carrying Value	1,119,955	1,029,192
FHLB stock, Carrying Value	18,068	26,464
Accrued interest receivable, Carrying Value	5,256	5,694
FHLB advances, Carrying Value	(138,000)	(50,000)
Repurchase agreements and other, Carrying Value	(60,563)	(90,578)
Advance payments by borrowers for taxes and insurance, Carrying Value	(13,350)	(20,060)
Accrued interest payable, Carrying Value	(380)	(550)
Available for sale securities, Fair value	507,125	511,006
Reported Value Measurement
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Cash and cash equivalents, Carrying Value	29,590	77,331
Available for sale securities, Carrying value	507,125	511,006
Loans held for sale, Carrying Value	10,567	4,838
Loans, net, Carrying Value	1,119,955	1,029,192
FHLB stock, Carrying Value	18,068	26,464
Accrued interest receivable, Carrying Value	5,256	5,694
Interest rate caps, Carrying Value	268	546
Purchased certificate of deposit option, Carrying Value	557	155
Checking, savings and money market accounts, Carrying Value	(899,603)	(899,481)
Certificates of deposit, Carrying Value	(446,774)	(492,271)
FHLB advances, Carrying Value	(138,000)	(50,000)
Repurchase agreements and other, Carrying Value	(60,563)	(90,578)
Advance payments by borrowers for taxes and insurance, Carrying Value	(13,350)	(20,060)
Accrued interest payable, Carrying Value	(380)	(550)
Written certificate of deposit option, Carrying Value	(557)	(155)
Estimate of Fair Value Measurement \| 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	29,590	77,331
Available for sale securities, Fair value		445
Checking, savings and money market accounts, Fair Value	(899,603)	(899,481)
Advance payments by borrowers for taxes and insurance, Fair Value	(13,350)	(20,060)
Estimate of Fair Value Measurement \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Available for sale securities, Fair value	507,125	510,561
Loans held for sale, Fair Value	10,873	4,866
Accrued interest receivable, Fair Value	1,941	2,584
Purchased certificate of deposit option, Fair Value	557	155
Certificates of deposit, Fair Value	(452,727)	(500,651)
FHLB advances, Fair Value	(141,993)	(55,327)
Repurchase agreements and other, Fair Value	(64,335)	(98,462)
Accrued interest payable, Fair Value	(380)	(550)
Written certificate of deposit option, Fair Value	(557)	(155)
Estimate of Fair Value Measurement \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Loans held for sale, Fair Value	1,131,377	1,031,491
Accrued interest receivable, Fair Value	3,315	3,110
Interest rate caps, Fair Value	$ 268	$ 546

Accrued interest receivable fair value.

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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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Certificates of deposit option.

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- Definition

Certificates of deposit at fair value.

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Deposits money market deposits fair value.

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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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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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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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-Subparagraph (SX 210.9-03.1,2,3)

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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-Subparagraph (SX 210.5-02.1)

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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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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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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No definition available.

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Amount classified as loans attributable to disposal group held for sale or disposed of. 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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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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