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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2014
Point
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Mar. 31, 2013
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Dec. 31, 2013
Point
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Days principal payments should be past due for recognition of income on a loan be discontinued and previously accrued interest is reversed |
90 days |
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| Loan charge-off, amount |
$ 133,000 |
$ 317,000 |
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| Loan portfolio risk factor |
1.18 |
|
1.18 |
| Days loans are past due to be nonperforming loans |
90 days |
|
90 days |
| Commitments to lend additional funds |
0 |
|
0 |
| Allowance for loan losses related to TDRs modified |
0 |
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Other Consumer
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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|
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| Loan charge-off, amount |
52,000 |
105,000 |
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| Loan charge-off period |
90 days |
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Bank Overdrafts
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Loan charge-off period |
45 days |
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Charge Off Treatment
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Principal charge-offs |
0 |
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Qualitative Factor Economic Condition
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Loan portfolio risk factor |
1.20 |
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1.20 |
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Qualitative Factor Past Due Loans
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|
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Loan portfolio risk factor |
1.20 |
|
1.20 |
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Qualitative Factor Other Internal and External Factors
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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|
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| Loan portfolio risk factor |
1.30 |
|
1.30 |
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Overall Qualitative Factor
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|
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
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| Increase in estimated allowance for loan losses |
486,000 |
|
471,000 |
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Partial charge-off loan
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|
|
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
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| Loan charge-off, amount |
486,000 |
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| Number of loan |
12 |
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Classified Loans
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
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| Increase in estimated allowance for loan losses |
512,000 |
|
521,000 |
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Minimum
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Period of performance borrower need to demonstrate for a loan be restored to accrual status |
6 months |
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| Value of significant property |
$ 200,000 |
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