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Investment Securities (Detail) (USD $)
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Sep. 30, 2012
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Dec. 31, 2011
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|---|---|---|
| Investment [Line Items] | ||
| Amortized Cost | $ 120,679,000 | $ 108,921,000 |
| Gross Unrealized Gains | 2,862,000 | 2,658,000 |
| Gross Unrealized Losses | 166,000 | 139,000 |
| Fair Value | 123,375,000 | 111,440,000 |
| Amortized Cost | 14,000 | 16,000 |
| Gross Unrealized Gains | 0 | 0 |
| Gross Unrealized Losses | 0 | 0 |
| Fair Value | 14,000 | 16,000 |
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Agency mortgage-backed securities
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||
| Investment [Line Items] | ||
| Amortized Cost | 22,022,000 | 11,689,000 |
| Gross Unrealized Gains | 538,000 | 542,000 |
| Gross Unrealized Losses | 9,000 | 11,000 |
| Fair Value | 22,551,000 | 12,220,000 |
| Amortized Cost | 14,000 | 16,000 |
| Gross Unrealized Gains | 0 | 0 |
| Gross Unrealized Losses | 0 | 0 |
| Fair Value | 14,000 | 16,000 |
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Agency Collateralized Mortgage Obligations
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||
| Investment [Line Items] | ||
| Amortized Cost | 24,278,000 | 23,196,000 |
| Gross Unrealized Gains | 169,000 | 152,000 |
| Gross Unrealized Losses | 90,000 | 60,000 |
| Fair Value | 24,357,000 | 23,288,000 |
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Collateralized Mortgage Obligations Issued By Private Enterprise
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||
| Investment [Line Items] | ||
| Amortized Cost | 666,000 | 896,000 |
| Gross Unrealized Gains | 19,000 | 16,000 |
| Gross Unrealized Losses | 28,000 | 32,000 |
| Fair Value | 657,000 | 880,000 |
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Agency CMO
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| Investment [Line Items] | ||
| Amortized Cost | 42,119,000 | 41,971,000 |
| Gross Unrealized Gains | 330,000 | 395,000 |
| Gross Unrealized Losses | 1,000 | 3,000 |
| Fair Value | 42,448,000 | 42,363,000 |
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Municipal Notes
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| Investment [Line Items] | ||
| Amortized Cost | 28,331,000 | 25,800,000 |
| Gross Unrealized Gains | 1,750,000 | 1,501,000 |
| Gross Unrealized Losses | 20,000 | 0 |
| Fair Value | 30,061,000 | 27,301,000 |
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Debt Securities
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||
| Investment [Line Items] | ||
| Amortized Cost | 117,416,000 | 103,552,000 |
| Gross Unrealized Gains | 2,806,000 | 2,606,000 |
| Gross Unrealized Losses | 148,000 | 106,000 |
| Fair Value | 120,074,000 | 106,052,000 |
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Mutual Funds
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| Investment [Line Items] | ||
| Amortized Cost | 3,263,000 | 5,369,000 |
| Gross Unrealized Gains | 56,000 | 52,000 |
| Gross Unrealized Losses | 18,000 | 33,000 |
| Fair Value | $ 3,301,000 | $ 5,388,000 |