Impaired Loans, Segregated by Class of Loans (Detail) (USD $) | 12 Months Ended |
Dec. 31, 2013 | Dec. 31, 2012 |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | $16,101,000 | $19,446,000 |
With No Related Allowance, Unpaid Principal Balance | 17,993,000 | 21,371,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 18,687,000 | 21,704,000 |
With No Related Allowance, Interest Income Recognized | 980,000 | 1,036,000 |
With Related Allowance, Recorded Investment | 24,045,000 | 26,589,000 |
With Related Allowance, Unpaid Principal Balance | 24,164,000 | 26,703,000 |
With Related Allowance, Related Allowance | 563,000 | 755,000 |
With Related Allowance, Average Recorded Investment | 24,591,000 | 27,145,000 |
With Related Allowance, Interest Income Recognized | 1,073,000 | 1,131,000 |
Recorded Investment, Total | 40,146,000 | 46,035,000 |
Unpaid Principal Balance, Total | 42,157,000 | 48,074,000 |
Related Allowance, Total | 563,000 | 755,000 |
Average Recorded Investment, Total | 43,278,000 | 48,849,000 |
Interest Income Recognized, Total | 2,053,000 | 2,167,000 |
Consumer - Non Real Estate | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Recorded Investment, Total | 76,000 | 84,000 |
Unpaid Principal Balance, Total | 76,000 | 97,000 |
Average Recorded Investment, Total | 81,000 | 101,000 |
Interest Income Recognized, Total | 4,000 | 7,000 |
Consumer - Non Real Estate | Consumer Credit Card Financing Receivable | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Related Allowance | ' | ' |
Consumer - Non Real Estate | Consumer Other Financing Receivable | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 68,000 | 72,000 |
With No Related Allowance, Unpaid Principal Balance | 68,000 | 85,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 70,000 | 87,000 |
With No Related Allowance, Interest Income Recognized | 4,000 | 6,000 |
With Related Allowance, Recorded Investment | 8,000 | 12,000 |
With Related Allowance, Unpaid Principal Balance | 8,000 | 12,000 |
With Related Allowance, Average Recorded Investment | 11,000 | 14,000 |
With Related Allowance, Interest Income Recognized | ' | 1,000 |
Commercial - Non Real Estate | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 1,099,000 | 948,000 |
With No Related Allowance, Unpaid Principal Balance | 1,305,000 | 1,125,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 1,384,000 | 1,185,000 |
With No Related Allowance, Interest Income Recognized | 79,000 | 59,000 |
With Related Allowance, Recorded Investment | 1,205,000 | 2,279,000 |
With Related Allowance, Unpaid Principal Balance | 1,205,000 | 2,279,000 |
With Related Allowance, Related Allowance | 25,000 | 45,000 |
With Related Allowance, Average Recorded Investment | 1,282,000 | 2,377,000 |
With Related Allowance, Interest Income Recognized | 45,000 | 99,000 |
Recorded Investment, Total | 2,304,000 | 3,227,000 |
Unpaid Principal Balance, Total | 2,510,000 | 3,404,000 |
Related Allowance, Total | 25,000 | 45,000 |
Average Recorded Investment, Total | 2,666,000 | 3,562,000 |
Interest Income Recognized, Total | 124,000 | 158,000 |
Commercial Real Estate | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Recorded Investment, Total | 19,393,000 | 22,871,000 |
Unpaid Principal Balance, Total | 20,217,000 | 23,383,000 |
Related Allowance, Total | 215,000 | 360,000 |
Average Recorded Investment, Total | 20,768,000 | 23,641,000 |
Interest Income Recognized, Total | 1,015,000 | 1,125,000 |
Commercial Real Estate | Owner occupied | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 3,480,000 | 5,622,000 |
With No Related Allowance, Unpaid Principal Balance | 4,062,000 | 5,926,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 4,365,000 | 5,961,000 |
With No Related Allowance, Interest Income Recognized | 239,000 | 304,000 |
With Related Allowance, Recorded Investment | 3,666,000 | 4,157,000 |
With Related Allowance, Unpaid Principal Balance | 3,666,000 | 4,157,000 |
With Related Allowance, Related Allowance | 77,000 | 153,000 |
With Related Allowance, Average Recorded Investment | 3,727,000 | 4,236,000 |
With Related Allowance, Interest Income Recognized | 166,000 | 218,000 |
Commercial Real Estate | Income Producing | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 3,734,000 | 3,274,000 |
With No Related Allowance, Unpaid Principal Balance | 3,887,000 | 3,394,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 3,938,000 | 3,422,000 |
With No Related Allowance, Interest Income Recognized | 183,000 | 135,000 |
With Related Allowance, Recorded Investment | 7,287,000 | 8,507,000 |
With Related Allowance, Unpaid Principal Balance | 7,343,000 | 8,562,000 |
With Related Allowance, Related Allowance | 126,000 | 164,000 |
With Related Allowance, Average Recorded Investment | 7,465,000 | 8,662,000 |
With Related Allowance, Interest Income Recognized | 382,000 | 418,000 |
Commercial Real Estate | Multifamily | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Related Allowance | ' | ' |
With Related Allowance, Recorded Investment | 1,226,000 | 1,311,000 |
With Related Allowance, Unpaid Principal Balance | 1,259,000 | 1,344,000 |
With Related Allowance, Related Allowance | 12,000 | 43,000 |
With Related Allowance, Average Recorded Investment | 1,273,000 | 1,360,000 |
With Related Allowance, Interest Income Recognized | 45,000 | 50,000 |
Construction & Development | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Recorded Investment, Total | 5,333,000 | 6,329,000 |
Unpaid Principal Balance, Total | 5,701,000 | 6,666,000 |
Related Allowance, Total | 115,000 | 151,000 |
Average Recorded Investment, Total | 5,916,000 | 6,793,000 |
Interest Income Recognized, Total | 275,000 | 225,000 |
Construction & Development | 1-4 Family Residential | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Related Allowance | ' | ' |
With Related Allowance, Recorded Investment | 360,000 | 388,000 |
With Related Allowance, Unpaid Principal Balance | 366,000 | 395,000 |
With Related Allowance, Related Allowance | 8,000 | 7,000 |
With Related Allowance, Average Recorded Investment | 371,000 | 399,000 |
With Related Allowance, Interest Income Recognized | 19,000 | 20,000 |
Construction & Development | Construction & Development, Other | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 1,545,000 | 2,329,000 |
With No Related Allowance, Unpaid Principal Balance | 1,881,000 | 2,657,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 1,981,000 | 2,718,000 |
With No Related Allowance, Interest Income Recognized | 112,000 | 141,000 |
With Related Allowance, Recorded Investment | 3,176,000 | 3,250,000 |
With Related Allowance, Unpaid Principal Balance | 3,181,000 | 3,252,000 |
With Related Allowance, Related Allowance | 107,000 | 144,000 |
With Related Allowance, Average Recorded Investment | 3,224,000 | 3,314,000 |
With Related Allowance, Interest Income Recognized | 118,000 | 45,000 |
Construction & Development | Farmland | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 252,000 | 362,000 |
With No Related Allowance, Unpaid Principal Balance | 273,000 | 362,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 340,000 | 362,000 |
With No Related Allowance, Interest Income Recognized | 26,000 | 19,000 |
Residential | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Recorded Investment, Total | 13,040,000 | 13,524,000 |
Unpaid Principal Balance, Total | 13,653,000 | 14,524,000 |
Related Allowance, Total | 208,000 | 199,000 |
Average Recorded Investment, Total | 13,847,000 | 14,752,000 |
Interest Income Recognized, Total | 635,000 | 652,000 |
Residential | 1-4 Family Residential | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 5,632,000 | 6,510,000 |
With No Related Allowance, Unpaid Principal Balance | 6,198,000 | 7,472,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 6,281,000 | 7,546,000 |
With No Related Allowance, Interest Income Recognized | 322,000 | 350,000 |
With Related Allowance, Recorded Investment | 6,778,000 | 6,366,000 |
With Related Allowance, Unpaid Principal Balance | 6,795,000 | 6,381,000 |
With Related Allowance, Related Allowance | 204,000 | 197,000 |
With Related Allowance, Average Recorded Investment | 6,893,000 | 6,458,000 |
With Related Allowance, Interest Income Recognized | 279,000 | 262,000 |
Residential | Equity Lines | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 95,000 | 93,000 |
With No Related Allowance, Unpaid Principal Balance | 101,000 | 95,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 105,000 | 164,000 |
With No Related Allowance, Interest Income Recognized | 3,000 | 7,000 |
Residential | Junior Liens | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 196,000 | 236,000 |
With No Related Allowance, Unpaid Principal Balance | 218,000 | 255,000 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 223,000 | 259,000 |
With No Related Allowance, Interest Income Recognized | 12,000 | 15,000 |
With Related Allowance, Recorded Investment | 339,000 | 319,000 |
With Related Allowance, Unpaid Principal Balance | 341,000 | 321,000 |
With Related Allowance, Related Allowance | 4,000 | 2,000 |
With Related Allowance, Average Recorded Investment | 345,000 | 325,000 |
With Related Allowance, Interest Income Recognized | $19,000 | $18,000 |