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Activity in Allowance for Loan and Lease Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Allowance for credit losses: |  |
Beginning of year | $ 13,873 | $ 17,283
Charge-offs | (2,704) | (18,778)
Recoveries | 430 | 1,158
Provision | 1,600 | 14,210
Ending Balance | 13,199 | 13,873
Specific | 6,215 | 7,125
General | 6,984 | 6,748
Financing Receivable, Allowance for Credit Losses, Total | 13,199 | 13,873
Individually | 76,040 | 78,162
Collectively | 751,261 | 801,633
Total Loans | 827,301 | 879,795
Consumer Loans |  |
Allowance for credit losses: |  |
Beginning of year | 2,114 | 2,608
Charge-offs | (509) | (2,568)
Recoveries | 74 | 278
Provision | 49 | 1,796
Ending Balance | 1,728 | 2,114
Specific | 603 | 878
General | 1,125 | 1,236
Financing Receivable, Allowance for Credit Losses, Total | 1,728 | 2,114
Individually | 4,113 | 4,348
Collectively | 22,929 | 24,524
Total Loans | 27,042 | 28,872
Real Estate Loans |  |
Allowance for credit losses: |  |
Beginning of year | 8,034 | 8,260
Charge-offs | (1,422) | (11,108)
Recoveries | 164 | 302
Provision | (288) | 10,580
Ending Balance | 6,488 | 8,034
Specific | 3,093 | 4,180
General | 3,395 | 3,854
Financing Receivable, Allowance for Credit Losses, Total | 6,488 | 8,034
Individually | 63,122 | 66,133
Collectively | 492,489 | 479,656
Total Loans | 555,611 | 545,789
Agricultural |  |
Allowance for credit losses: |  |
Beginning of year | 258 | 19
Charge-offs | (28) | (634)
Recoveries | 0 | 0
Provision | 174 | 873
Ending Balance | 404 | 258
Specific | 0 | 28
General | 404 | 230
Financing Receivable, Allowance for Credit Losses, Total | 404 | 258
Individually | 659 | 663
Collectively | 26,108 | 21,819
Total Loans | 26,767 | 22,482
Commercial and Industrial |  |
Allowance for credit losses: |  |
Beginning of year | 2,056 | 4,638
Charge-offs | (688) | (3,517)
Recoveries | 191 | 483
Provision | 1,525 | 452
Ending Balance | 3,084 | 2,056
Specific | 1,372 | 934
General | 1,712 | 1,122
Financing Receivable, Allowance for Credit Losses, Total | 3,084 | 2,056
Individually | 4,850 | 3,656
Collectively | 188,457 | 254,240
Total Loans | 193,307 | 257,896
Small Business Loans |  |
Allowance for credit losses: |  |
Beginning of year | 1,246 | 1,447
Charge-offs | (37) | (753)
Recoveries | 0 | 95
Provision | 201 | 457
Ending Balance | 1,410 | 1,246
Specific | 1,073 | 1,038
General | 337 | 208
Financing Receivable, Allowance for Credit Losses, Total | 1,410 | 1,246
Individually | 3,146 | 3,227
Collectively | 17,531 | 17,296
Total Loans | 20,677 | 20,523
Direct Finance Leases |  |
Allowance for credit losses: |  |
Beginning of year | 165 | 311
Charge-offs | (20) | (198)
Recoveries | 1 | 0
Provision | (61) | 52
Ending Balance | 85 | 165
Specific | 74 | 67
General | 11 | 98
Financing Receivable, Allowance for Credit Losses, Total | 85 | 165
Individually | 150 | 135
Collectively | 3,747 | 4,098
Total Loans | $ 3,897 | $ 4,233

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- Definition Financing Receivable, Allowance for Credit Losses, Specific Reserves + References No definition available. + Details
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- Definition Loans and Leases Receivable Allowance, General Reserves + References No definition available. + Details
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- Definition A valuation allowance for financing receivables 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 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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