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Allowance for Loan Losses - Changes in the Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Allowance for loan losses: |  |  |  |
Beginning balance | $ 14,707 | $ 15,395 | $ 14,268 | $ 16,528
Charge-offs | (634) | (456) | (1,524) | (3,440)
Recoveries | 287 | 506 | 816 | 857
Provision | 400 |  | 1,200 | 1,500
Ending Balance | 14,760 | 15,445 | 14,760 | 15,445
Commercial and Agriculture [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning balance | 1,395 | 2,067 | 1,822 | 2,841
Charge-offs | (187) | (13) | (187) | (326)
Recoveries | 127 | 143 | 157 | 238
Provision | 52 | (592) | (405) | (1,148)
Ending Balance | 1,387 | 1,605 | 1,387 | 1,605
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning balance | 3,383 | 3,135 | 2,580 | 3,263
Charge-offs | (164) | (146) | (363) | (1,615)
Recoveries | 13 | 241 | 223 | 316
Provision | (286) | (364) | 506 | 902
Ending Balance | 2,946 | 2,866 | 2,946 | 2,866
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning balance | 5,427 | 4,853 | 4,798 | 4,296
Charge-offs | (18) |  | (81) | (105)
Recoveries | 14 | 10 | 105 | 34
Provision | (89) | 115 | 512 | 753
Ending Balance | 5,334 | 4,978 | 5,334 | 4,978
Residential Real Estate [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning balance | 3,470 | 4,439 | 3,747 | 5,224
Charge-offs | (237) | (275) | (779) | (1,329)
Recoveries | 124 | 95 | 289 | 216
Provision | 864 | 53 | 964 | 201
Ending Balance | 4,221 | 4,312 | 4,221 | 4,312
Real Estate Construction [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning balance | 434 | 287 | 428 | 184
Recoveries | 1 | 2 | 4 | 5
Provision | (7) | 76 | (4) | 176
Ending Balance | 428 | 365 | 428 | 365
Consumer and Other [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning balance | 190 | 196 | 196 | 214
Charge-offs | (28) | (22) | (114) | (65)
Recoveries | 8 | 15 | 38 | 48
Provision | 195 | 26 | 245 | 18
Ending Balance | 365 | 215 | 365 | 215
Unallocated [Member] |  |  |  |
Allowance for loan losses: |  |  |  |
Beginning balance | 408 | 418 | 697 | 506
Provision | (329) | 686 | (618) | 598
Ending Balance | $ 79 | $ 1,104 | $ 79 | $ 1,104

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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