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Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance $ 55,565 [1] $ 65,636 [1]
With an Allowance Recorded Recorded Investment 55,075 [2] 63,870 [2]
With an Allowance Recorded Related Allowance 6,215 7,125
With an Allowance Recorded Average Recorded Investment 55,317 65,281
With an Allowance Recorded Interest Income Recognized 385 [3] 1,390 [3]
With no Related Allowance Recorded Unpaid Principal Balance 25,037 [1] 15,885 [1]
With no Related Allowance Recorded Recorded Investment 20,965 [2] 14,292 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 22,076 15,123
With no Related Allowance Recorded Interest Income Recognized 10 [3] 4 [3]
Individually impaired loans Unpaid Principal Balance 80,602 [1] 81,521 [1]
Individually impaired loans Recorded Investment 76,040 [2] 78,162 [2]
Individually impaired loans Related Allowance 6,215 7,125
Individually impaired loans Average Recorded Investment 77,393 80,404
Individually impaired loans Interest Income Recognized 395 [3] 1,394 [3]
Consumer Loans
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 4,140 [1] 4,349 [1]
With an Allowance Recorded Recorded Investment 4,088 [2] 4,344 [2]
With an Allowance Recorded Related Allowance 603 878
With an Allowance Recorded Average Recorded Investment 4,136 4,493
With an Allowance Recorded Interest Income Recognized 65 [3] 183 [3]
With no Related Allowance Recorded Unpaid Principal Balance 46 [1] 4 [1]
With no Related Allowance Recorded Recorded Investment 25 [2] 4 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 25 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 1,031 [1] 1,008 [1]
With no Related Allowance Recorded Recorded Investment 659 [2] 635 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 659 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 2,572 [1] 2,955 [1]
With an Allowance Recorded Recorded Investment 2,536 [2] 2,920 [2]
With an Allowance Recorded Related Allowance 1,372 934
With an Allowance Recorded Average Recorded Investment 2,577 3,100
With an Allowance Recorded Interest Income Recognized 21 [3] 51 [3]
With no Related Allowance Recorded Unpaid Principal Balance 2,399 [1] 735 [1]
With no Related Allowance Recorded Recorded Investment 2,314 [2] 736 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 2,318 740
With no Related Allowance Recorded Interest Income Recognized 10 [3] 0 [3]
Small Business Administration
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 2,622 [1] 2,704 [1]
With an Allowance Recorded Recorded Investment 2,425 [2] 2,507 [2]
With an Allowance Recorded Related Allowance 1,073 1,038
With an Allowance Recorded Average Recorded Investment 2,425 2,507
With an Allowance Recorded Interest Income Recognized 15 [3] 53 [3]
With no Related Allowance Recorded Unpaid Principal Balance 1,008 [1] 1,008 [1]
With no Related Allowance Recorded Recorded Investment 721 [2] 720 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 721 720
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 150 [1] 135 [1]
With an Allowance Recorded Recorded Investment 150 [2] 135 [2]
With an Allowance Recorded Related Allowance 74 67
With an Allowance Recorded Average Recorded Investment 150 135
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 46,081 [1] 55,465 [1]
With an Allowance Recorded Recorded Investment 45,876 [2] 53,936 [2]
With an Allowance Recorded Related Allowance 3,093 4,180
With an Allowance Recorded Average Recorded Investment 46,029 55,018
With an Allowance Recorded Interest Income Recognized 284 [3] 1,103 [3]
With no Related Allowance Recorded Unpaid Principal Balance 20,553 [1] 13,130 [1]
With no Related Allowance Recorded Recorded Investment 17,246 [2] 12,197 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 18,353 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 9,978 [1] 10,313 [1]
With an Allowance Recorded Recorded Investment 9,978 [2] 10,313 [2]
With an Allowance Recorded Related Allowance 1,227 1,244
With an Allowance Recorded Average Recorded Investment 10,084 10,755
With an Allowance Recorded Interest Income Recognized 27 [3] 86 [3]
With no Related Allowance Recorded Unpaid Principal Balance 2,150 [1] 2,335 [1]
With no Related Allowance Recorded Recorded Investment 2,039 [2] 2,335 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 2,039 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 17,425 [1] 19,218 [1]
With an Allowance Recorded Recorded Investment 17,412 [2] 18,910 [2]
With an Allowance Recorded Related Allowance 592 955
With an Allowance Recorded Average Recorded Investment 17,442 19,024
With an Allowance Recorded Interest Income Recognized 125 [3] 401 [3]
With no Related Allowance Recorded Unpaid Principal Balance 6,342 [1] 4,312 [1]
With no Related Allowance Recorded Recorded Investment 5,879 [2] 4,312 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 5,888 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 575 [1] 1,142 [1]
With an Allowance Recorded Recorded Investment 541 [2] 1,142 [2]
With an Allowance Recorded Related Allowance 68 163
With an Allowance Recorded Average Recorded Investment 541 1,144
With an Allowance Recorded Interest Income Recognized 4 [3] 9 [3]
With no Related Allowance Recorded Unpaid Principal Balance 504 [1] 116 [1]
With no Related Allowance Recorded Recorded Investment 390 [2] 116 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 444 155
With no Related Allowance Recorded Interest Income Recognized 0 [3] 1 [3]
Real Estate Loans | Multi-family residential
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance   0 [1]
With an Allowance Recorded Recorded Investment   0 [2]
With an Allowance Recorded Related Allowance   0
With an Allowance Recorded Average Recorded Investment   0
With an Allowance Recorded Interest Income Recognized   0 [3]
With no Related Allowance Recorded Unpaid Principal Balance   0 [1]
With no Related Allowance Recorded Recorded Investment   0 [2]
With no Related Allowance Recorded Related Allowance   0
With no Related Allowance Recorded Average Recorded Investment   0
With no Related Allowance Recorded Interest Income Recognized   0 [3]
Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Impaired [Line Items]    
With an Allowance Recorded Unpaid Principal Balance 4,258 [1] 5,846 [1]
With an Allowance Recorded Recorded Investment 4,258 [2] 5,585 [2]
With an Allowance Recorded Related Allowance 312 563
With an Allowance Recorded Average Recorded Investment 4,275 5,666
With an Allowance Recorded Interest Income Recognized 23 [3] 126 [3]
With no Related Allowance Recorded Unpaid Principal Balance 5,459 [1] 4,298 [1]
With no Related Allowance Recorded Recorded Investment 4,159 [2] 3,365 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 4,167 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 13,762 [1] 18,539 [1]
With an Allowance Recorded Recorded Investment 13,604 [2] 17,579 [2]
With an Allowance Recorded Related Allowance 894 1,230
With an Allowance Recorded Average Recorded Investment 13,603 18,079
With an Allowance Recorded Interest Income Recognized 105 [3] 481 [3]
With no Related Allowance Recorded Unpaid Principal Balance 4,257 [1] 390 [1]
With no Related Allowance Recorded Recorded Investment 2,938 [2] 390 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 3,974 421
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 83 [1] 254 [1]
With an Allowance Recorded Recorded Investment 83 [2] 254 [2]
With an Allowance Recorded Related Allowance 0 2
With an Allowance Recorded Average Recorded Investment 84 259
With an Allowance Recorded Interest Income Recognized 0 [3] 0 [3]
With no Related Allowance Recorded Unpaid Principal Balance 1,841 [1] 1,679 [1]
With no Related Allowance Recorded Recorded Investment 1,841 [2] 1,679 [2]
With no Related Allowance Recorded Related Allowance 0 0
With no Related Allowance Recorded Average Recorded Investment 1,841 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.