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Other Commitments and Contingencies and Derivatives - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Cash pledged for collateral interest rate swap |
$ 300,000 |
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| Derivative loan commitments with a notional amount outstanding |
4,800,000 |
35,900,000 |
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| Fair value commitments of an asset |
177,000 |
288,000 |
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| Total, Liability, Fair Value |
89,000 |
12,000 |
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| Net mortgage banking gains |
583,000 |
2,400,000 |
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| Net gains on sale of loans |
771,000 |
2,600,000 |
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| Net derivative mortgage banking losses/gains |
(188,000) |
(232,000) |
508,000 |
| Net mortgage banking gain recognized |
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|
2,100,000 |
| Net gains on sale of loans |
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|
1,600,000 |
| Net derivative mortgage banking gains |
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|
508,000 |
| Outstanding commitments due to extension of contract |
8,900,000 |
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| Total annual payments due to extension of contract |
2,200,000 |
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Derivative Loan Commitments [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Fair value commitments of an asset |
13,000 |
288,000 |
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| Total, Liability, Fair Value |
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Forward Loan Sale Commitments [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Derivative loan commitments with a notional amount outstanding |
7,000,000 |
44,400,000 |
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| Fair value commitments of an asset |
75,000 |
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| Total, Liability, Fair Value |
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$ 12,000 |
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