Risk Category of Loans by Class of Loans (Excluding Mortgage Loans Held for Sale) (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 |
In Thousands, unless otherwise specified |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | $591,275 | $579,983 |
Unearned discount | 328 | 360 |
Loans, net of unearned discount | 590,947 | 579,623 |
Pass | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 576,669 | 562,172 |
Special Mention | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 1,800 | 5,149 |
Substandard | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 12,806 | 12,662 |
Doubtful | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 0 | 0 |
Commercial Real Estate | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 334,217 | 331,629 |
Unearned discount | 208 | 236 |
Loans, net of unearned discount | 334,009 | 331,393 |
Commercial Real Estate | Pass | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 322,113 | 316,573 |
Commercial Real Estate | Special Mention | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 1,358 | 4,084 |
Commercial Real Estate | Substandard | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 10,746 | 10,972 |
Commercial Real Estate | Doubtful | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 0 | 0 |
Mortgage Real Estate | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 151,070 | 147,245 |
Unearned discount | 98 | 97 |
Loans, net of unearned discount | 150,972 | 147,148 |
Mortgage Real Estate | Pass | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 149,263 | 145,787 |
Mortgage Real Estate | Special Mention | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 31 | 32 |
Mortgage Real Estate | Substandard | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 1,776 | 1,426 |
Mortgage Real Estate | Doubtful | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 0 | 0 |
Installment and Other | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 21,877 | 19,764 |
Unearned discount | 0 | 0 |
Loans, net of unearned discount | 21,877 | 19,764 |
Installment and Other | Pass | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 21,809 | 19,725 |
Installment and Other | Special Mention | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 0 | 0 |
Installment and Other | Substandard | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 68 | 39 |
Installment and Other | Doubtful | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 0 | 0 |
Commercial,Financial and Agriculture | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 84,111 | 81,345 |
Unearned discount | 22 | 27 |
Loans, net of unearned discount | 84,089 | 81,318 |
Commercial,Financial and Agriculture | Pass | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 83,484 | 80,087 |
Commercial,Financial and Agriculture | Special Mention | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 411 | 1,033 |
Commercial,Financial and Agriculture | Substandard | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | 216 | 225 |
Commercial,Financial and Agriculture | Doubtful | ' | ' |
Financing Receivable, Recorded Investment [Line Items] | ' | ' |
Loans and leases receivable, gross | $0 | $0 |