Impaired Loans, Segregated by Class of Loans (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | $12,201 | $11,690 |
With No Related Allowance, Unpaid Principal Balance | 14,224 | 13,755 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 14,303 | 14,409 |
With No Related Allowance, Interest Income Recognized | 141 | 584 |
With Related Allowance, Recorded Investment | 19,928 | 21,614 |
With Related Allowance, Unpaid Principal Balance | 20,146 | 21,820 |
With Related Allowance, Related Allowance | 1,714 | 1,684 |
With Related Allowance, Average Recorded Investment | 20,248 | 22,318 |
With Related Allowance, Interest Income Recognized | 227 | 1,025 |
Recorded Investment, Total | 32,129 | 33,304 |
Unpaid Principal Balance, Total | 34,370 | 35,575 |
Related Allowance, Total | 1,714 | 1,684 |
Average Recorded Investment, Total | 34,551 | 36,727 |
Interest Income Recognized, Total | 368 | 1,609 |
Commercial - Non Real Estate | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 503 | 339 |
With No Related Allowance, Unpaid Principal Balance | 578 | 407 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 587 | 421 |
With No Related Allowance, Interest Income Recognized | 8 | 22 |
With Related Allowance, Recorded Investment | 1,326 | 1,560 |
With Related Allowance, Unpaid Principal Balance | 1,327 | 1,563 |
With Related Allowance, Related Allowance | 83 | 78 |
With Related Allowance, Average Recorded Investment | 1,352 | 1,670 |
With Related Allowance, Interest Income Recognized | 13 | 71 |
Recorded Investment, Total | 1,829 | 1,899 |
Unpaid Principal Balance, Total | 1,905 | 1,970 |
Related Allowance, Total | 83 | 78 |
Average Recorded Investment, Total | 1,939 | 2,091 |
Interest Income Recognized, Total | 21 | 93 |
Commercial Real Estate | | |
Financing Receivable, Impaired [Line Items] | | |
Recorded Investment, Total | 16,166 | 16,679 |
Unpaid Principal Balance, Total | 16,767 | 17,324 |
Related Allowance, Total | 1,178 | 1,115 |
Average Recorded Investment, Total | 16,828 | 17,942 |
Interest Income Recognized, Total | 195 | 859 |
Commercial Real Estate | Owner occupied | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 1,825 | 1,996 |
With No Related Allowance, Unpaid Principal Balance | 2,094 | 2,329 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 2,102 | 2,671 |
With No Related Allowance, Interest Income Recognized | 26 | 143 |
With Related Allowance, Recorded Investment | 4,045 | 4,109 |
With Related Allowance, Unpaid Principal Balance | 4,117 | 4,166 |
With Related Allowance, Related Allowance | 903 | 823 |
With Related Allowance, Average Recorded Investment | 4,134 | 4,215 |
With Related Allowance, Interest Income Recognized | 42 | 178 |
Commercial Real Estate | Income Producing | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 2,037 | 1,891 |
With No Related Allowance, Unpaid Principal Balance | 2,210 | 2,057 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 2,218 | 2,080 |
With No Related Allowance, Interest Income Recognized | 26 | 98 |
With Related Allowance, Recorded Investment | 7,068 | 7,485 |
With Related Allowance, Unpaid Principal Balance | 7,122 | 7,540 |
With Related Allowance, Related Allowance | 207 | 218 |
With Related Allowance, Average Recorded Investment | 7,146 | 7,731 |
With Related Allowance, Interest Income Recognized | 90 | 396 |
Commercial Real Estate | Multifamily | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Related Allowance | 0 | 0 |
With Related Allowance, Recorded Investment | 1,191 | 1,198 |
With Related Allowance, Unpaid Principal Balance | 1,224 | 1,232 |
With Related Allowance, Related Allowance | 68 | 74 |
With Related Allowance, Average Recorded Investment | 1,228 | 1,245 |
With Related Allowance, Interest Income Recognized | 11 | 44 |
Construction & Development | | |
Financing Receivable, Impaired [Line Items] | | |
Recorded Investment, Total | 3,266 | 3,308 |
Unpaid Principal Balance, Total | 4,307 | 4,347 |
Related Allowance, Total | 27 | 31 |
Average Recorded Investment, Total | 4,333 | 4,568 |
Interest Income Recognized, Total | 29 | 124 |
Construction & Development | 1-4 Family Residential | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Related Allowance | 0 | 0 |
With Related Allowance, Recorded Investment | 347 | 350 |
With Related Allowance, Unpaid Principal Balance | 353 | 356 |
With Related Allowance, Related Allowance | 7 | 8 |
With Related Allowance, Average Recorded Investment | 355 | 362 |
With Related Allowance, Interest Income Recognized | 5 | 18 |
Construction & Development | Construction & Development, Other | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 2,207 | 2,232 |
With No Related Allowance, Unpaid Principal Balance | 3,236 | 3,259 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 3,255 | 3,455 |
With No Related Allowance, Interest Income Recognized | 16 | 72 |
With Related Allowance, Recorded Investment | 712 | 726 |
With Related Allowance, Unpaid Principal Balance | 718 | 732 |
With Related Allowance, Related Allowance | 20 | 23 |
With Related Allowance, Average Recorded Investment | 723 | 751 |
With Related Allowance, Interest Income Recognized | 8 | 34 |
Construction & Development | Farmland | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Related Allowance | 0 | 0 |
Residential | | |
Financing Receivable, Impaired [Line Items] | | |
Recorded Investment, Total | 10,844 | 11,393 |
Unpaid Principal Balance, Total | 11,367 | 11,909 |
Related Allowance, Total | 421 | 455 |
Average Recorded Investment, Total | 11,426 | 12,097 |
Interest Income Recognized, Total | 123 | 531 |
Residential | 1-4 Family Residential | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 5,265 | 4,878 |
With No Related Allowance, Unpaid Principal Balance | 5,705 | 5,313 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 5,738 | 5,385 |
With No Related Allowance, Interest Income Recognized | 60 | 229 |
With Related Allowance, Recorded Investment | 5,177 | 6,105 |
With Related Allowance, Unpaid Principal Balance | 5,222 | 6,150 |
With Related Allowance, Related Allowance | 381 | 414 |
With Related Allowance, Average Recorded Investment | 5,245 | 6,256 |
With Related Allowance, Interest Income Recognized | 58 | 280 |
Residential | Equity Lines | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 65 | 67 |
With No Related Allowance, Unpaid Principal Balance | 75 | 76 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 75 | 77 |
With No Related Allowance, Interest Income Recognized | 1 | 3 |
With Related Allowance, Recorded Investment | 54 | 56 |
With Related Allowance, Unpaid Principal Balance | 55 | 56 |
With Related Allowance, Related Allowance | 40 | 41 |
With Related Allowance, Average Recorded Investment | 56 | 59 |
With Related Allowance, Interest Income Recognized | | 2 |
Residential | Junior Liens | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 283 | 287 |
With No Related Allowance, Unpaid Principal Balance | 310 | 314 |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 312 | 320 |
With No Related Allowance, Interest Income Recognized | 4 | 17 |
Consumer - Non Real Estate | | |
Financing Receivable, Impaired [Line Items] | | |
With No Related Allowance, Recorded Investment | 16 | |
With No Related Allowance, Unpaid Principal Balance | 16 | |
With No Related Allowance, Related Allowance | 0 | 0 |
With No Related Allowance, Average Recorded Investment | 16 | |
With Related Allowance, Recorded Investment | 8 | 25 |
With Related Allowance, Unpaid Principal Balance | 8 | 25 |
With Related Allowance, Related Allowance | 5 | 5 |
With Related Allowance, Average Recorded Investment | 9 | 29 |
With Related Allowance, Interest Income Recognized | | 2 |
Recorded Investment, Total | 24 | 25 |
Unpaid Principal Balance, Total | 24 | 25 |
Related Allowance, Total | 5 | 5 |
Average Recorded Investment, Total | 25 | 29 |
Interest Income Recognized, Total | | $2 |