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Investment Securities Available for Sale with Gross Unrealized Losses Aggregated by Investment Category and Length of Time Individual Investment Securities Have Been in Continuous Position (Detail) (USD $)
In Thousands, unless otherwise specified
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Sep. 30, 2013
Investment
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| Investments, Unrealized Loss Position [Line Items] |
|
| Number of investment positions in continuous loss position less than twelve months |
80 |
| Number of investment positions in continuous loss position more than twelve months |
4 |
| Number of investment positions in continuous loss position |
84 |
| Fair value of securities in continuous loss position less than twelve months |
$ 62,152 |
| Fair value of securities in continuous loss position more than twelve months |
1,757 |
| Fair value of securities in continuous loss position |
63,909 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
2,010 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
56 |
| Gross unrealized losses of securities in continuous loss position |
2,066 |
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Agency notes and bonds
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| Investments, Unrealized Loss Position [Line Items] |
|
| Number of investment positions in continuous loss position less than twelve months |
20 |
| Fair value of securities in continuous loss position less than twelve months |
22,248 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
557 |
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Agency CMO
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
| Number of investment positions in continuous loss position less than twelve months |
11 |
| Number of investment positions in continuous loss position more than twelve months |
1 |
| Fair value of securities in continuous loss position less than twelve months |
10,542 |
| Fair value of securities in continuous loss position more than twelve months |
775 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
291 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
16 |
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Agency mortgage-backed securities
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| Investments, Unrealized Loss Position [Line Items] |
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| Number of investment positions in continuous loss position less than twelve months |
17 |
| Fair value of securities in continuous loss position less than twelve months |
14,413 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
235 |
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Municipal Obligations
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| Investments, Unrealized Loss Position [Line Items] |
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| Number of investment positions in continuous loss position less than twelve months |
31 |
| Number of investment positions in continuous loss position more than twelve months |
2 |
| Fair value of securities in continuous loss position less than twelve months |
13,405 |
| Fair value of securities in continuous loss position more than twelve months |
589 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
918 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
25 |
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Mutual funds
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| Investments, Unrealized Loss Position [Line Items] |
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| Number of investment positions in continuous loss position less than twelve months |
1 |
| Number of investment positions in continuous loss position more than twelve months |
1 |
| Fair value of securities in continuous loss position less than twelve months |
1,544 |
| Fair value of securities in continuous loss position more than twelve months |
393 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
9 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
$ 15 |