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INVESTMENT SECURITIES - Additional Information (Detail) (USD $)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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| Schedule of Available-for-sale Securities [Line Items] |
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| Percentage of debt securities considered to be of investment-grade |
94.00% |
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94.00% |
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| Percentage of tax-exempt municipal securities classified as pre-refunded |
10.00% |
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10.00% |
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| General obligation bonds as percentage of tax-exempt municipal securities that were not pre-refunded |
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44.00% |
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| Special revenue bonds as percentage of tax exempt municipal securities that were not pre-refunded |
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56.00% |
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| Percentage of tax-exempt securities insured by bond insurers |
22.00% |
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22.00% |
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| Maximum percentage of any general obligation bonds in one state |
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11.00% |
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| Residential and commercial mortgage-backed securities, percentage of collateral consisting of prime loans |
99.00% |
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99.00% |
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| Percentage of corporate securities associated with financial services industry |
21.90% |
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21.90% |
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19.30% |
| Other-than-temporary impairments |
$ 0 |
$ 0 |
$ 0 |
$ 0 |
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