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Loans - Analysis of Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | $ 5,849 | $ 5,484 | $ 5,357 | $ 5,386 | $ 5,386
Charge Offs | (95) | (647) | (630) | (1,008) | (1,262)
Recoveries | 66 | 77 | 198 | 233 | 374
Provision (Credit) | 282 | 303 | 1,154 | 582 |
Other Non-interest expense related to unfunded | 10 | (18) | 33 | 7 |
Ending Balance | 6,112 | 5,199 | 6,112 | 5,199 | 5,357
Ending balance: individually evaluated for impairment | 252 | 422 | 252 | 422 |
Ending balance: collectively evaluated for impairment | 5,860 | 4,777 | 5,860 | 4,777 |
Ending balance: loans acquired with deteriorated credit quality | 2 | 2 | 2 | 2 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 608,604 | 523,326 | 608,604 | 523,326 | 576,113
Ending balance: individually evaluated for impairment | 1,686 | 1,561 | 1,686 | 1,561 |
Ending balance: collectively evaluated for impairment | 606,918 | 521,765 | 606,918 | 521,765 |
Ending balance: loans acquired with deteriorated credit quality | 527 | 539 | 527 | 539 |
Consumer Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 569 | 361 | 257 | 368 | 368
Charge Offs | 0 | (12) | (130) | (112) |
Recoveries | 11 | 6 | 28 | 15 |
Provision (Credit) | 218 | 52 | 643 | 136 |
Other Non-interest expense related to unfunded | 0 | 0 | 0 | 0 |
Ending Balance | 798 | 407 | 798 | 407 |
Ending balance: individually evaluated for impairment | 49 | 114 | 49 | 114 |
Ending balance: collectively evaluated for impairment | 749 | 293 | 749 | 293 |
Ending balance: loans acquired with deteriorated credit quality | 2 | 2 | 2 | 2 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 97,651 | 79,268 | 97,651 | 79,268 | 92,438
Ending balance: individually evaluated for impairment | 165 | 524 | 165 | 524 |
Ending balance: collectively evaluated for impairment | 97,486 | 78,744 | 97,486 | 78,744 |
Ending balance: loans acquired with deteriorated credit quality | 527 | 539 | 527 | 539 |
Agricultural Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 125 | 115 | 131 | 113 | 113
Charge Offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision (Credit) | 3 | (1) | (3) | 1 |
Other Non-interest expense related to unfunded | 0 | 0 | 0 | 0 |
Ending Balance | 128 | 114 | 128 | 114 |
Ending balance: individually evaluated for impairment | 0 | 9 | 0 | 9 |
Ending balance: collectively evaluated for impairment | 128 | 105 | 128 | 105 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 48,812 | 37,758 | 48,812 | 37,758 | 44,301
Ending balance: individually evaluated for impairment | 0 | 88 | 0 | 88 |
Ending balance: collectively evaluated for impairment | 48,812 | 37,670 | 48,812 | 37,670 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Agricultural [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 317 | 277 | 326 | 290 | 290
Charge Offs | 0 | 0 | 0 | 0 |
Recoveries | 1 | 1 | 4 | 5 |
Provision (Credit) | 18 | 4 | 6 | (13) |
Other Non-interest expense related to unfunded | 0 | 0 | 0 | 0 |
Ending Balance | 336 | 282 | 336 | 282 |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 336 | 282 | 336 | 282 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 67,221 | 56,752 | 67,221 | 56,752 | 65,449
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 67,221 | 56,752 | 67,221 | 56,752 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Commercial Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 1,886 | 1,460 | 2,107 | 1,749 | 1,749
Charge Offs | 0 | 0 | (230) | (64) |
Recoveries | 0 | 0 | 3 | 1 |
Provision (Credit) | (54) | 523 | (48) | 297 |
Other Non-interest expense related to unfunded | 0 | 0 | 0 | 0 |
Ending Balance | 1,832 | 1,983 | 1,832 | 1,983 |
Ending balance: individually evaluated for impairment | 0 | 219 | 0 | 219 |
Ending balance: collectively evaluated for impairment | 1,832 | 1,764 | 1,832 | 1,764 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 274,074 | 232,104 | 274,074 | 232,104 | 248,893
Ending balance: individually evaluated for impairment | 709 | 571 | 709 | 571 |
Ending balance: collectively evaluated for impairment | 273,365 | 231,533 | 273,365 | 231,533 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Commercial and Industrial [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 1,469 | 2,138 | 1,359 | 2,183 | 2,183
Charge Offs | 0 | (513) | 0 | (513) |
Recoveries | 5 | 17 | 15 | 73 |
Provision (Credit) | (149) | (313) | (49) | (414) |
Other Non-interest expense related to unfunded | 0 | 0 | 0 | 0 |
Ending Balance | 1,325 | 1,329 | 1,325 | 1,329 |
Ending balance: individually evaluated for impairment | 203 | 80 | 203 | 80 |
Ending balance: collectively evaluated for impairment | 1,122 | 1,249 | 1,122 | 1,249 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 97,780 | 96,643 | 97,780 | 96,643 | 103,856
Ending balance: individually evaluated for impairment | 812 | 378 | 812 | 378 |
Ending balance: collectively evaluated for impairment | 96,968 | 96,265 | 96,968 | 96,265 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Consumer [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 290 | 266 | 292 | 268 | 268
Charge Offs | (95) | (122) | (270) | (319) |
Recoveries | 49 | 53 | 148 | 139 |
Provision (Credit) | 57 | 76 | 131 | 185 |
Other Non-interest expense related to unfunded | 0 | 0 | 0 | 0 |
Ending Balance | 301 | 273 | 301 | 273 |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 301 | 273 | 301 | 273 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 23,066 | 20,801 | 23,066 | 20,801 | 21,176
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 23,066 | 20,801 | 23,066 | 20,801 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 186 | 187 | 163 | 162 | 162
Charge Offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision (Credit) | 0 | 0 | 0 | 0 |
Other Non-interest expense related to unfunded | 10 | (18) | 33 | 7 |
Ending Balance | 196 | 169 | 196 | 169 |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 196 | 169 | 196 | 169 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 0 | 0 | 0 | 0 |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Unallocated [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 1,007 | 680 | 722 | 253 | 253
Charge Offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision (Credit) | 189 | (38) | 474 | 389 |
Other Non-interest expense related to unfunded | 0 | 0 | 0 | 0 |
Ending Balance | 1,196 | 642 | 1,196 | 642 |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 1,196 | 642 | 1,196 | 642 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 0 | 0 | 0 | 0 |
Ending balance: individually evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: collectively evaluated for impairment | 0 | 0 | 0 | 0 |
Ending balance: loans acquired with deteriorated credit quality | $ 0 | $ 0 | $ 0 | $ 0 |

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