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Investment Securities (Detail) - Issuers with investment securities totaling in excess of 10% of shareholders' equity (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Issuer
Amortized Cost	$ 153,359	$ 83,708
Fair Value	154,234	83,629
Fannie Mae [Member]
Issuer
Amortized Cost	114,151	41,795
Fair Value	115,311	42,665
Fair Value as % of Shareholders Equity	37.80%	14.20%
Bank of America [Member]
Issuer
Amortized Cost	39,208	41,913
Fair Value	$ 38,923	$ 40,964
Fair Value as % of Shareholders Equity	12.80%	13.70%

Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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