Fair Value Measurements - Book Value and Estimated Fair Value of Bank's Significant Financial Instruments Not Recorded at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial Liabilities:
Securities sold under agreements to repurchase with retail customers	$ 71,311	$ 60,791
Book Value [Member]
Financial Assets:
Cash and due from banks	71,361	62,544
Federal Home Loan Bank of New York stock	17,120	17,061
Loans receivable and mortgage loans held for sale	1,505,483	1,529,946
Financial Liabilities:
Deposits other than time deposits	1,522,943	1,493,453
Time deposits	217,351	226,218
Securities sold under agreements to repurchase with retail customers	71,311	60,791
Federal Home Loan Bank advances and other borrowings	252,500	252,500
Level 1 Inputs [Member]
Financial Assets:
Cash and due from banks	71,361	62,544
Federal Home Loan Bank of New York stock
Loans receivable and mortgage loans held for sale
Financial Liabilities:
Deposits other than time deposits
Time deposits
Securities sold under agreements to repurchase with retail customers	71,311	60,791
Federal Home Loan Bank advances and other borrowings
Level 2 Inputs [Member]
Financial Assets:
Cash and due from banks
Federal Home Loan Bank of New York stock
Loans receivable and mortgage loans held for sale
Financial Liabilities:
Deposits other than time deposits	1,522,943	1,493,453
Time deposits	222,070	231,445
Securities sold under agreements to repurchase with retail customers
Federal Home Loan Bank advances and other borrowings	257,677	258,577
Level 3 Inputs [Member]
Financial Assets:
Cash and due from banks
Federal Home Loan Bank of New York stock	17,120	17,061
Loans receivable and mortgage loans held for sale	1,544,225	1,572,291
Financial Liabilities:
Deposits other than time deposits
Time deposits
Securities sold under agreements to repurchase with retail customers
Federal Home Loan Bank advances and other borrowings

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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For 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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- Definition

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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