Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components of the available for sale portfolio
Mortgage-related securities, Amortized cost	$ 566,509	$ 454,060
Available-for-sale securities, Gross unrealized gains	8,763	5,538
Available-for-sale securities, Gross unrealized losses	(710)
Total fair value	574,562	459,598
U.S. Treasury and government sponsored entities' securities [Member]
Components of the available for sale portfolio
Mortgage-related securities, Amortized cost	161,845	50,003
Available-for-sale securities, Gross unrealized gains	2,409	797
Available-for-sale securities, Gross unrealized losses	(562)
Total fair value	163,692	50,800
Equity securities [Member]
Components of the available for sale portfolio
Mortgage-related securities, Amortized cost	101	114
Available-for-sale securities, Gross unrealized gains	212	149
Available-for-sale securities, Gross unrealized losses
Total fair value	313	263
Mortgage-backed GSE securities: residential [Member]
Components of the available for sale portfolio
Mortgage-related securities, Amortized cost	404,563	403,943
Available-for-sale securities, Gross unrealized gains	6,142	4,592
Available-for-sale securities, Gross unrealized losses	(148)
Total fair value	$ 410,557	$ 408,535

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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 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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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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