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Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance $ 42,594 [1] $ 65,636 [1]
With an Allowance Recorded Recorded Investment 40,844 [2] 63,870 [2]
With an Allowance Recorded Related Allowance 7,150 7,125
With an Allowance Recorded Average Recorded Investment 41,213 65,281
With an Allowance Recorded Interest Income Recognized 690 [3] 1,390 [3]
With no Related Allowance Recorded Unpaid Principal Balance 26,849 [1] 15,885 [1]
With no Related Allowance Recorded Recorded Investment 24,772 [2] 14,292 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 26,126 15,123
With no Related Allowance Recorded Interest Income Recognized 24 [3] 4 [3]
Individually impaired loans Unpaid Principal Balance 69,443 [1] 81,521 [1]
Individually impaired loans Recorded Investment 65,616 [2],[4] 78,162 [2],[4]
Gross Unrealized Losses (7,150) (7,125)
Individually impaired loans Average Recorded Investment 67,339 80,404
Individually impaired loans Interest Income Recognized 714 [3] 1,394 [3]
Consumer Loans
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 3,969 [1] 4,349 [1]
With an Allowance Recorded Recorded Investment 3,902 [2] 4,344 [2]
With an Allowance Recorded Related Allowance 784 878
With an Allowance Recorded Average Recorded Investment 3,995 4,493
With an Allowance Recorded Interest Income Recognized 90 [3] 183 [3]
With no Related Allowance Recorded Unpaid Principal Balance 181 [1] 4 [1]
With no Related Allowance Recorded Recorded Investment 52 [2] 4 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 60 7
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Agricultural
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 0 [1] 28 [1]
With an Allowance Recorded Recorded Investment 0 [2] 28 [2]
With an Allowance Recorded Related Allowance 0 28
With an Allowance Recorded Average Recorded Investment 0 28
With an Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
With no Related Allowance Recorded Unpaid Principal Balance 21 [1] 1,008 [1]
With no Related Allowance Recorded Recorded Investment 20 [2] 635 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 22 1,017
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Commercial and Industrial
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 1,944 [1] 2,955 [1]
With an Allowance Recorded Recorded Investment 1,908 [2] 2,920 [2]
With an Allowance Recorded Related Allowance 744 934
With an Allowance Recorded Average Recorded Investment 1,984 3,100
With an Allowance Recorded Interest Income Recognized 44 [3] 51 [3]
With no Related Allowance Recorded Unpaid Principal Balance 2,463 [1] 735 [1]
With no Related Allowance Recorded Recorded Investment 2,345 [2] 736 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 2,470 740
With no Related Allowance Recorded Interest Income Recognized 24 [3] 0 [3]
Small Business Administration
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 2,450 [1] 2,704 [1]
With an Allowance Recorded Recorded Investment 2,255 [2] 2,507 [2]
With an Allowance Recorded Related Allowance 1,147 1,038
With an Allowance Recorded Average Recorded Investment 2,254 2,507
With an Allowance Recorded Interest Income Recognized 29 [3] 53 [3]
With no Related Allowance Recorded Unpaid Principal Balance 1,100 [1] 1,008 [1]
With no Related Allowance Recorded Recorded Investment 772 [2] 720 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 773 720
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Direct Financing Leases
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 60 [1] 135 [1]
With an Allowance Recorded Recorded Investment 60 [2] 135 [2]
With an Allowance Recorded Related Allowance 30 67
With an Allowance Recorded Average Recorded Investment 60 135
With an Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
With no Related Allowance Recorded Unpaid Principal Balance 0 [1] 0 [1]
With no Related Allowance Recorded Recorded Investment 0 [2] 0 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 0 0
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Real Estate Loans
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 34,171 [1] 55,465 [1]
With an Allowance Recorded Recorded Investment 32,719 [2] 53,936 [2]
With an Allowance Recorded Related Allowance 4,445 4,180
With an Allowance Recorded Average Recorded Investment 32,920 55,018
With an Allowance Recorded Interest Income Recognized 527 [3] 1,103 [3]
With no Related Allowance Recorded Unpaid Principal Balance 23,084 [1] 13,130 [1]
With no Related Allowance Recorded Recorded Investment 21,583 [2] 12,197 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 22,801 12,639
With no Related Allowance Recorded Interest Income Recognized 0 [3] 4 [3]
Real Estate Loans | 1-4 family residential construction
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 0 [1] 153 [1]
With an Allowance Recorded Recorded Investment 0 [2] 153 [2]
With an Allowance Recorded Related Allowance 0 23
With an Allowance Recorded Average Recorded Investment 0 91
With an Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
With no Related Allowance Recorded Unpaid Principal Balance 0 [1] 0 [1]
With no Related Allowance Recorded Recorded Investment 0 [2] 0 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 0 0
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Real Estate Loans | Other Construction/Land
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 5,619 [1] 10,313 [1]
With an Allowance Recorded Recorded Investment 5,619 [2] 10,313 [2]
With an Allowance Recorded Related Allowance 1,290 1,244
With an Allowance Recorded Average Recorded Investment 5,666 10,755
With an Allowance Recorded Interest Income Recognized 46 [3] 86 [3]
With no Related Allowance Recorded Unpaid Principal Balance 1,879 [1] 2,335 [1]
With no Related Allowance Recorded Recorded Investment 1,792 [2] 2,335 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 2,636 2,346
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 15,901 [1] 19,218 [1]
With an Allowance Recorded Recorded Investment 15,901 [2] 18,910 [2]
With an Allowance Recorded Related Allowance 1,338 955
With an Allowance Recorded Average Recorded Investment 15,959 19,024
With an Allowance Recorded Interest Income Recognized 209 [3] 401 [3]
With no Related Allowance Recorded Unpaid Principal Balance 6,597 [1] 4,312 [1]
With no Related Allowance Recorded Recorded Investment 5,874 [2] 4,312 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 6,209 4,491
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Real Estate Loans | Equity Lines
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 496 [1] 1,142 [1]
With an Allowance Recorded Recorded Investment 496 [2] 1,142 [2]
With an Allowance Recorded Related Allowance 54 163
With an Allowance Recorded Average Recorded Investment 497 1,144
With an Allowance Recorded Interest Income Recognized 7 [3] 9 [3]
With no Related Allowance Recorded Unpaid Principal Balance 760 [1] 116 [1]
With no Related Allowance Recorded Recorded Investment 593 [2] 116 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 594 155
With no Related Allowance Recorded Interest Income Recognized 0 [3] 1 [3]
Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 5,765 [1] 5,846 [1]
With an Allowance Recorded Recorded Investment 4,473 [2] 5,585 [2]
With an Allowance Recorded Related Allowance 462 563
With an Allowance Recorded Average Recorded Investment 4,500 5,666
With an Allowance Recorded Interest Income Recognized 83 [3] 126 [3]
With no Related Allowance Recorded Unpaid Principal Balance 5,560 [1] 4,298 [1]
With no Related Allowance Recorded Recorded Investment 5,154 [2] 3,365 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 5,183 3,540
With no Related Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 6,390 [1] 18,539 [1]
With an Allowance Recorded Recorded Investment 6,230 [2] 17,579 [2]
With an Allowance Recorded Related Allowance 1,301 1,230
With an Allowance Recorded Average Recorded Investment 6,298 18,079
With an Allowance Recorded Interest Income Recognized 182 [3] 481 [3]
With no Related Allowance Recorded Unpaid Principal Balance 7,832 [1] 390 [1]
With no Related Allowance Recorded Recorded Investment 7,714 [2] 390 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 7,719 421
With no Related Allowance Recorded Interest Income Recognized 0 [3] 3 [3]
Real Estate Loans | Farmland
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 0 [1] 254 [1]
With an Allowance Recorded Recorded Investment 0 [2] 254 [2]
With an Allowance Recorded Related Allowance 0 2
With an Allowance Recorded Average Recorded Investment 0 259
With an Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
With no Related Allowance Recorded Unpaid Principal Balance 456 [1] 1,679 [1]
With no Related Allowance Recorded Recorded Investment 456 [2] 1,679 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 460 1,686
With no Related Allowance Recorded Interest Income Recognized $ 0 [3] $ 0 [3]
[1] Contractual principal balance due from customer.
[2] Principal balance on Company's books, less any direct charge offs.
[3] Interest income is recognized on performing balances on a regular accrual basis.
[4] Principal balance on Company's books less any direct charge-off