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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