INVESTMENT SECURITIES - Additional Information (Detail)
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3 Months Ended |
9 Months Ended |
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Sep. 30, 2016
USD ($)
position
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Sep. 30, 2015
USD ($)
|
Sep. 30, 2016
USD ($)
position
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Sep. 30, 2015
USD ($)
|
Dec. 31, 2015
position
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| Investment [Line Items] |
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| Percentage of debt securities considered to be of investment-grade |
98.00%
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|
98.00%
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| Percentage of tax-exempt municipal securities classified as pre-refunded |
8.00%
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|
8.00%
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|
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| General obligation bonds as percentage of tax-exempt municipal securities that were not pre-refunded |
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45.00%
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| Special revenue bonds as percentage of tax exempt municipal securities that were not pre-refunded |
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|
55.00%
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| Maximum percentage of any general obligation bonds in one state |
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11.00%
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| Percentage of tax exempt securities |
5.00%
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|
5.00%
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| Percentage of corporate securities associated with financial services industry |
22.00%
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|
22.00%
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|
25.00%
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| Securities in unrealized loss positions, number of positions |
300
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|
300
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|
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| Number of positions |
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|
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|
2,100
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| Other-than-temporary impairments | $ |
$ 0
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$ 0
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$ 0
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$ 0
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| Residential Mortgage-Backed Securities |
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|
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| Investment [Line Items] |
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| Mortgage-backed Securities as Percentage of Agency Mortgage-backed Securities |
99.00%
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|
99.00%
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|
98.00%
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