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Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | $ 50,140 | [1] | $ 49,370 | [1]
Unpaid Principal Balance | 90,622 | [1] | 105,367 | [1]
Recorded Investment | 47,266 | [2] | 48,704 | [2]
Recorded Investment | 83,203 | [2],[3] | 98,329 | [2],[3]
Related Allowance | 7,671 |  | 8,754 |
Average Recorded Investment | 48,214 |  | 49,301 |
Average Recorded Investment | 84,827 |  | 99,816 |
Interest Income Recognized | 661 | [4] | 691 | [4]
Interest Income Recognized | 1,129 | [4] | 1,214 |
Unpaid Principal Balance | 40,482 | [1] | 55,997 | [1]
Recorded Investment | 35,937 | [2] | 49,625 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 36,613 |  | 50,515 |
Interest Income Recognized | 468 | [4] | 523 | [4]
Agricultural |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 1,676 | [1] |  |
Recorded Investment | 1,676 | [2] |  |
Related Allowance |  |  |  |
Average Recorded Investment | 1,662 |  |  |
Commercial and Industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 2,137 | [1] | 4,135 | [1]
Recorded Investment | 2,137 | [2] | 4,106 | [2]
Related Allowance | 498 |  | 1,481 |
Average Recorded Investment | 2,199 |  | 4,197 |
Interest Income Recognized | 22 | [4] | 24 | [4]
Unpaid Principal Balance | 702 | [1] | 916 | [1]
Recorded Investment | 668 | [2] | 915 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 679 |  | 965 |
Interest Income Recognized | 1 | [4] | 11 | [4]
Small Business Administration |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 3,472 | [1] | 3,902 | [1]
Recorded Investment | 3,472 | [2] | 3,903 | [2]
Related Allowance | 1,055 |  | 1,212 |
Average Recorded Investment | 3,472 |  | 3,903 |
Interest Income Recognized | 26 | [4] | 2 | [4]
Unpaid Principal Balance | 227 | [1] |  |
Recorded Investment | 227 | [2] |  |
Related Allowance |  |  |  |
Average Recorded Investment | 227 |  |  |
Direct finance leases |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 322 | [1] | 591 | [1]
Recorded Investment | 322 | [2] | 591 | [2]
Related Allowance | 159 |  | 291 |
Average Recorded Investment | 322 |  | 591 |
Related Allowance |  |  |  |
Consumer loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 3,425 | [1] | 3,896 | [1]
Recorded Investment | 3,425 | [2] | 3,858 | [2]
Related Allowance | 386 |  | 541 |
Average Recorded Investment | 3,473 |  | 3,920 |
Interest Income Recognized | 69 | [4] | 56 | [4]
Unpaid Principal Balance | 753 | [1] | 448 | [1]
Recorded Investment | 753 | [2] | 448 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 773 |  | 462 |
Interest Income Recognized | 15 | [4] | 11 | [4]
Real Estate Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 40,784 | [1] | 36,846 | [1]
Recorded Investment | 37,910 | [2] | 36,246 | [2]
Related Allowance | 5,573 |  | 5,229 |
Average Recorded Investment | 38,748 |  | 36,690 |
Interest Income Recognized | 544 | [4] | 609 | [4]
Unpaid Principal Balance | 37,124 | [1] | 54,633 | [1]
Recorded Investment | 32,613 | [2] | 48,262 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 33,272 |  | 49,088 |
Interest Income Recognized | 452 | [4] | 501 | [4]
Real Estate Loans | 1-4 family residential construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 352 | [1] | 188 | [1]
Recorded Investment | 352 | [2] | 188 | [2]
Related Allowance | 46 |  | 13 |
Average Recorded Investment | 352 |  | 188 |
Unpaid Principal Balance | 4,350 | [1] | 4,784 | [1]
Recorded Investment | 1,622 | [2] | 2,056 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 1,654 |  | 2,069 |
Real Estate Loans | Other Construction/Land |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 13,520 | [1] | 3,477 | [1]
Recorded Investment | 10,674 | [2] | 2,906 | [2]
Related Allowance | 1,702 |  | 735 |
Average Recorded Investment | 10,694 |  | 2,925 |
Interest Income Recognized | 169 | [4] | 89 | [4]
Unpaid Principal Balance | 785 | [1] | 11,740 | [1]
Recorded Investment | 501 | [2] | 9,081 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 625 |  | 9,326 |
Interest Income Recognized | 7 | [4] | 193 | [4]
Real Estate Loans | 1-4 Family - closed end |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 10,862 | [1] | 8,086 | [1]
Recorded Investment | 10,834 | [2] | 8,057 | [2]
Related Allowance | 880 |  | 821 |
Average Recorded Investment | 10,862 |  | 8,071 |
Interest Income Recognized | 158 | [4] | 222 | [4]
Unpaid Principal Balance | 9,061 | [1] | 12,467 | [1]
Recorded Investment | 8,778 | [2] | 12,203 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 8,807 |  | 12,250 |
Interest Income Recognized | 51 | [4] | 101 | [4]
Real Estate Loans | Equity Lines |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 377 | [1] | 1,072 | [1]
Recorded Investment | 377 | [2] | 1,072 | [2]
Related Allowance | 131 |  | 243 |
Average Recorded Investment | 377 |  | 1,069 |
Interest Income Recognized | 3 | [4] |  |
Unpaid Principal Balance | 393 | [1] | 307 | [1]
Recorded Investment | 393 | [2] | 307 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 398 |  | 318 |
Interest Income Recognized | 1 | [4] |  |
Real Estate Loans | Multi-family residential |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance |  |  | 2,941 | [1]
Recorded Investment |  |  | 2,941 | [2]
Related Allowance |  |  | 850 |
Average Recorded Investment |  |  | 2,950 |
Unpaid Principal Balance | 2,389 | [1] |  |
Recorded Investment | 1,780 | [2] |  |
Related Allowance |  |  |  |
Average Recorded Investment | 1,780 |  |  |
Real Estate Loans | Commercial real estate - owner occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 3,613 | [1] | 3,628 | [1]
Recorded Investment | 3,613 | [2] | 3,628 | [2]
Related Allowance | 873 |  | 834 |
Average Recorded Investment | 3,628 |  | 3,645 |
Interest Income Recognized | 41 | [4] | 24 | [4]
Unpaid Principal Balance | 6,141 | [1] | 6,049 | [1]
Recorded Investment | 5,685 | [2] | 6,030 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 6,107 |  | 6,136 |
Interest Income Recognized | 60 | [4] | 17 | [4]
Real Estate Loans | Commercial real estate - non-owner occupied |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 12,060 | [1] | 17,454 | [1]
Recorded Investment | 12,060 | [2] | 17,454 | [2]
Related Allowance | 1,941 |  | 1,733 |
Average Recorded Investment | 12,835 |  | 17,842 |
Interest Income Recognized | 173 | [4] | 274 | [4]
Unpaid Principal Balance | 12,052 | [1] | 11,818 | [1]
Recorded Investment | 11,901 | [2] | 11,666 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | 11,938 |  | 12,033 |
Interest Income Recognized | 333 | [4] | 190 | [4]
Real Estate Loans | Farmland |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance | 1,953 | [1] | 7,468 | [1]
Recorded Investment | 1,953 | [2] | 6,919 | [2]
Related Allowance |  |  |  |
Average Recorded Investment | $ 1,963 |  | $ 6,956 |
[1] | Contractual principal balance due from customer.
[2] | Principal balance on Company's books, less any direct charge offs.
[3] | Principal balance on Company's books less any direct charge-off
[4] | Interest income is recognized on performing balances on a regular accrual basis.

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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