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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Held-to-Maturity and Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 817,243	$ 886,031
Gross Unrealized Losses	(2,600)
Fair Value	829,341	907,498
Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	817,243	886,031
Gross Unrealized Gains	14,719	22,184
Gross Unrealized Losses	(2,621)	(717)
Fair Value	829,341	907,498
Federal National Mortgage Association ("FNMA") [Member] \| Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	361,501	396,910
Gross Unrealized Gains	6,588	9,588
Gross Unrealized Losses	(755)	(243)
Fair Value	367,334	406,255
Collateralized Mortgage Obligation ("CMO") [Member] \| Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	172,137	251,848
Gross Unrealized Gains	4,530	7,849
Gross Unrealized Losses	(583)	(301)
Fair Value	176,084	259,396
Collateralized Mortgage Obligation ("CMO") [Member] \| Trading securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,590	12,590
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	12,590	12,590
Government National Mortgage Association ("GNMA") [Member] \| Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	123,454	129,288
Gross Unrealized Gains	2,741	3,221
Gross Unrealized Losses	(534)	(54)
Fair Value	125,661	132,455
Federal Home Loan Mortgage Corporation ("FHLMC") [Member] \| Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	89,986	58,596
Gross Unrealized Gains	498	1,171
Gross Unrealized Losses	(297)	(117)
Fair Value	90,187	59,650
Reverse Mortgages [Member] \| Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	(425)	(457)
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	(425)	(457)
U.S. Government and government sponsored enterprises ("GSE") [Member] \| Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	46,707	46,726
Gross Unrealized Gains	218	266
Gross Unrealized Losses	(2)	(2)
Fair Value	46,923	46,990
State and political subdivisions [Member] \| Available-For-Sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,883	3,120
Gross Unrealized Gains	144	89
Gross Unrealized Losses	(450)
Fair Value	$ 23,577	$ 3,209

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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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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