Impaired Loans, Segregated by Class of Loans (Detail) (USD $) | 9 Months Ended | 12 Months Ended |
In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | $13,775 | $16,101 |
With No Related Allowance, Unpaid Principal Balance | 15,829 | 17,993 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 16,424 | 18,687 |
With No Related Allowance, Interest Income Recognized | 508 | 980 |
With Related Allowance, Recorded Investment | 21,982 | 24,045 |
With Related Allowance, Unpaid Principal Balance | 22,184 | 24,164 |
With Related Allowance, Related Allowance | 1,436 | 563 |
With Related Allowance, Average Recorded Investment | 22,552 | 24,591 |
With Related Allowance, Interest Income Recognized | 782 | 1,073 |
Recorded Investment, Total | 35,757 | 40,146 |
Unpaid Principal Balance, Total | 38,013 | 42,157 |
Related Allowance, Total | 1,436 | 563 |
Average Recorded Investment, Total | 38,976 | 43,278 |
Interest Income Recognized, Total | 1,290 | 2,053 |
Commercial - Non Real Estate | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 381 | 1,099 |
With No Related Allowance, Unpaid Principal Balance | 448 | 1,305 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 465 | 1,384 |
With No Related Allowance, Interest Income Recognized | 19 | 79 |
With Related Allowance, Recorded Investment | 1,613 | 1,205 |
With Related Allowance, Unpaid Principal Balance | 1,615 | 1,205 |
With Related Allowance, Related Allowance | 26 | 25 |
With Related Allowance, Average Recorded Investment | 1,677 | 1,282 |
With Related Allowance, Interest Income Recognized | 53 | 45 |
Recorded Investment, Total | 1,994 | 2,304 |
Unpaid Principal Balance, Total | 2,063 | 2,510 |
Related Allowance, Total | 26 | 25 |
Average Recorded Investment, Total | 2,142 | 2,666 |
Interest Income Recognized, Total | 72 | 124 |
Commercial Real Estate | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Recorded Investment, Total | 18,215 | 19,393 |
Unpaid Principal Balance, Total | 18,868 | 20,217 |
Related Allowance, Total | 1,067 | 215 |
Average Recorded Investment, Total | 19,317 | 20,768 |
Interest Income Recognized, Total | 689 | 1,015 |
Commercial Real Estate | Owner occupied | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 2,121 | 3,480 |
With No Related Allowance, Unpaid Principal Balance | 2,446 | 4,062 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 2,658 | 4,365 |
With No Related Allowance, Interest Income Recognized | 106 | 239 |
With Related Allowance, Recorded Investment | 4,416 | 3,666 |
With Related Allowance, Unpaid Principal Balance | 4,471 | 3,666 |
With Related Allowance, Related Allowance | 829 | 77 |
With Related Allowance, Average Recorded Investment | 4,505 | 3,727 |
With Related Allowance, Interest Income Recognized | 146 | 166 |
Commercial Real Estate | Income Producing | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 3,299 | 3,734 |
With No Related Allowance, Unpaid Principal Balance | 3,483 | 3,887 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 3,518 | 3,938 |
With No Related Allowance, Interest Income Recognized | 120 | 183 |
With Related Allowance, Recorded Investment | 7,173 | 7,287 |
With Related Allowance, Unpaid Principal Balance | 7,229 | 7,343 |
With Related Allowance, Related Allowance | 164 | 126 |
With Related Allowance, Average Recorded Investment | 7,388 | 7,465 |
With Related Allowance, Interest Income Recognized | 284 | 382 |
Commercial Real Estate | Multifamily | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Related Allowance | ' | ' |
With Related Allowance, Recorded Investment | 1,206 | 1,226 |
With Related Allowance, Unpaid Principal Balance | 1,239 | 1,259 |
With Related Allowance, Related Allowance | 74 | 12 |
With Related Allowance, Average Recorded Investment | 1,248 | 1,273 |
With Related Allowance, Interest Income Recognized | 33 | 45 |
Construction & Development | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Recorded Investment, Total | 3,451 | 5,333 |
Unpaid Principal Balance, Total | 4,506 | 5,701 |
Related Allowance, Total | 23 | 115 |
Average Recorded Investment, Total | 4,796 | 5,916 |
Interest Income Recognized, Total | 105 | 275 |
Construction & Development | 1-4 Family Residential | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Related Allowance | ' | ' |
With Related Allowance, Recorded Investment | 353 | 360 |
With Related Allowance, Unpaid Principal Balance | 359 | 366 |
With Related Allowance, Related Allowance | 9 | 8 |
With Related Allowance, Average Recorded Investment | 363 | 371 |
With Related Allowance, Interest Income Recognized | 14 | 19 |
Construction & Development | Construction & Development, Other | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 2,257 | 1,545 |
With No Related Allowance, Unpaid Principal Balance | 3,280 | 1,881 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 3,523 | 1,981 |
With No Related Allowance, Interest Income Recognized | 57 | 112 |
With Related Allowance, Recorded Investment | 731 | 3,176 |
With Related Allowance, Unpaid Principal Balance | 736 | 3,181 |
With Related Allowance, Related Allowance | 14 | 107 |
With Related Allowance, Average Recorded Investment | 750 | 3,224 |
With Related Allowance, Interest Income Recognized | 25 | 118 |
Construction & Development | Farmland | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 110 | 252 |
With No Related Allowance, Unpaid Principal Balance | 131 | 273 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 160 | 340 |
With No Related Allowance, Interest Income Recognized | 9 | 26 |
Residential | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Recorded Investment, Total | 12,027 | 13,040 |
Unpaid Principal Balance, Total | 12,506 | 13,653 |
Related Allowance, Total | 315 | 208 |
Average Recorded Investment, Total | 12,647 | 13,847 |
Interest Income Recognized, Total | 420 | 635 |
Residential | 1-4 Family Residential | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 5,109 | 5,632 |
With No Related Allowance, Unpaid Principal Balance | 5,512 | 6,198 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 5,562 | 6,281 |
With No Related Allowance, Interest Income Recognized | 176 | 322 |
With Related Allowance, Recorded Investment | 6,292 | 6,778 |
With Related Allowance, Unpaid Principal Balance | 6,335 | 6,795 |
With Related Allowance, Related Allowance | 271 | 204 |
With Related Allowance, Average Recorded Investment | 6,417 | 6,893 |
With Related Allowance, Interest Income Recognized | 219 | 279 |
Residential | Equity Lines | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 69 | 95 |
With No Related Allowance, Unpaid Principal Balance | 77 | 101 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 77 | 105 |
With No Related Allowance, Interest Income Recognized | 2 | 3 |
With Related Allowance, Recorded Investment | 40 | ' |
With Related Allowance, Unpaid Principal Balance | 40 | ' |
With Related Allowance, Related Allowance | 41 | ' |
With Related Allowance, Average Recorded Investment | 40 | ' |
With Related Allowance, Interest Income Recognized | 1 | ' |
Residential | Junior Liens | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 413 | 196 |
With No Related Allowance, Unpaid Principal Balance | 436 | 218 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 444 | 223 |
With No Related Allowance, Interest Income Recognized | 18 | 12 |
With Related Allowance, Recorded Investment | 104 | 339 |
With Related Allowance, Unpaid Principal Balance | 106 | 341 |
With Related Allowance, Related Allowance | 3 | 4 |
With Related Allowance, Average Recorded Investment | 107 | 345 |
With Related Allowance, Interest Income Recognized | 4 | 19 |
Consumer - Non Real Estate | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
With No Related Allowance, Recorded Investment | 16 | 68 |
With No Related Allowance, Unpaid Principal Balance | 16 | 68 |
With No Related Allowance, Related Allowance | ' | ' |
With No Related Allowance, Average Recorded Investment | 17 | 70 |
With No Related Allowance, Interest Income Recognized | 1 | 4 |
With Related Allowance, Recorded Investment | 54 | 8 |
With Related Allowance, Unpaid Principal Balance | 54 | 8 |
With Related Allowance, Related Allowance | 5 | ' |
With Related Allowance, Average Recorded Investment | 57 | 11 |
With Related Allowance, Interest Income Recognized | 3 | ' |
Recorded Investment, Total | 70 | 76 |
Unpaid Principal Balance, Total | 70 | 76 |
Related Allowance, Total | 5 | ' |
Average Recorded Investment, Total | 74 | 81 |
Interest Income Recognized, Total | $4 | $4 |