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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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Mar. 31, 2014
Investment
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| Investments, Unrealized Loss Position [Line Items] |
|
| Number of investment positions in continuous loss position less than twelve months |
68 |
| Number of investment positions in continuous loss position more than twelve months |
17 |
| Number of investment positions in continuous loss position |
85 |
| Fair value of securities in continuous loss position less than twelve months |
$ 55,690 |
| Fair value of securities in continuous loss position more than twelve months |
10,099 |
| Fair value of securities in continuous loss position |
65,789 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
967 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
559 |
| Gross unrealized losses of securities in continuous loss position |
1,526 |
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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 |
22,047 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
499 |
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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 |
2 |
| Fair value of securities in continuous loss position less than twelve months |
9,909 |
| Fair value of securities in continuous loss position more than twelve months |
1,742 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
185 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
79 |
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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 |
20 |
| 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 |
15,956 |
| Fair value of securities in continuous loss position more than twelve months |
1,747 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
113 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
66 |
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Municipal obligations
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
| Number of investment positions in continuous loss position less than twelve months |
16 |
| Number of investment positions in continuous loss position more than twelve months |
12 |
| Fair value of securities in continuous loss position less than twelve months |
6,220 |
| Fair value of securities in continuous loss position more than twelve months |
6,208 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
153 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
400 |
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Mutual fund investment
|
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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 |
1,558 |
| Fair value of securities in continuous loss position more than twelve months |
402 |
| Gross unrealized losses of securities in continuous loss position less than twelve months |
17 |
| Gross unrealized losses of securities in continuous loss position more than twelve months |
$ 14 |