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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
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | $ 14,361 | $ 14,268
Charge-offs | (126) | (585)
Recoveries | 198 | 232
Provision |  | 400
Ending Balance | 14,433 | 14,315
Commercial and Agriculture [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 1,478 | 1,819
Charge-offs | (22) |
Recoveries | 5 | 19
Provision | (15) | (43)
Ending Balance | 1,446 | 1,795
Commercial Real Estate Non Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 4,657 | 4,334
Charge-offs |  | (9)
Recoveries | 40 | 14
Provision | 14 | 587
Ending Balance | 4,711 | 4,926
Residential Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 4,086 | 3,747
Charge-offs | (96) | (328)
Recoveries | 89 | 131
Provision | 35 | 116
Ending Balance | 4,114 | 3,666
Real Estate Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 371 | 428
Recoveries | 1 | 1
Provision | 36 | 69
Ending Balance | 408 | 498
Farm Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 538 | 822
Recoveries |  | 51
Provision | (42) | (74)
Ending Balance | 496 | 799
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 382 | 200
Charge-offs | (8) | (50)
Recoveries | 14 | 14
Provision | (30) | 26
Ending Balance | 358 | 190
Commercial Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 2,467 | 2,221
Charge-offs |  | (198)
Recoveries | 49 | 2
Provision | (144) | (217)
Ending Balance | 2,372 | 1,808
Unallocated [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 382 | 697
Provision | 146 | (64)
Ending Balance | $ 528 | $ 633

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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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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51673446&loc=SL9156395-115594 Reference 2: 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 3: 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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