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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.