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Loans - Additional Information (Detail) (USD $)
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Receivables [Abstract] |
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| Percentage of outstanding principal balances of commercial real estate loans secured by owner-occupied properties |
79.00% |
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79.00% |
|
81.00% |
| Loans serviced for others |
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$ 64,100,000 |
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$ 60,200,000 |
| Concentrations of loans related to a single industry |
0 |
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0 |
|
0 |
| Troubled debt restructurings, loans |
7,700,000 |
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7,700,000 |
|
8,700,000 |
| Reserves allocated to customers whose loan terms are modified in troubled debt restructurings |
781,000 |
|
781,000 |
|
718,000 |
| Loans classified as troubled debt restructurings modified terms |
7,000,000 |
|
7,000,000 |
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| Loans classified as troubled debt restructurings nonaccrual status |
679,000 |
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679,000 |
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| Loans restructured, Subsequently Defaulted |
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|
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| Outstanding balance of commercial loans classified under credit risk, minimum amount |
275,000 |
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275,000 |
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| Loans listed as not rated under risk category, maximum amount |
$ 275,000 |
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$ 275,000 |
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| Non-performing loans past due days and greater |
90 days |
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90 days |
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