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Troubled Debt Restructurings, by Type of Loan Modification (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment $ 1,543 $ 5,135 $ 40,474
Agricultural
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     12
Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment 375 401 1,956
Consumer loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment 631 858 3,209
Small Business Administration Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   475 773
Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment 537 3,401 34,524
Real Estate Loans | Other construction/Land
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment 59 112 7,497
Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment 222 331 7,600
Real Estate Loans | Equity Lines
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment 29 29 575
Real Estate Loans | Commercial real estate - owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment 227 2,600 3,963
Real Estate Loans | Commercial real estate - non-owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   329 14,889
Rate
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     7,697
Rate | Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     19
Rate | Consumer loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     278
Rate | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     7,400
Rate | Real Estate Loans | Commercial real estate - non-owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     7,400
Term
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   3,666 10,396
Term | Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   173 342
Term | Consumer loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   662 495
Term | Small Business Administration Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     621
Term | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   2,831 8,938
Term | Real Estate Loans | Other construction/Land
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   59 555
Term | Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   109 6,419
Term | Real Estate Loans | Equity Lines
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   29 71
Term | Real Estate Loans | Commercial real estate - owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   2,305 1,893
Term | Real Estate Loans | Commercial real estate - non-owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   329  
Interest-Only
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     1,786
Interest-Only | Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     23
Interest-Only | Small Business Administration Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     106
Interest-Only | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     1,657
Interest-Only | Real Estate Loans | Equity Lines
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     426
Interest-Only | Real Estate Loans | Commercial real estate - owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     1,231
Rate & Term
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   1,200 5,574
Rate & Term | Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   228 1,188
Rate & Term | Consumer loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   149 2,069
Rate & Term | Small Business Administration Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   475 46
Rate & Term | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   348 2,271
Rate & Term | Real Estate Loans | Other construction/Land
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   53 754
Rate & Term | Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     151
Rate & Term | Real Estate Loans | Commercial real estate - owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   295 297
Rate & Term | Real Estate Loans | Commercial real estate - non-owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     1,069
Rate & Interest-Only
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     7,883
Rate & Interest-Only | Consumer loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     282
Rate & Interest-Only | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     7,601
Rate & Interest-Only | Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     561
Rate & Interest-Only | Real Estate Loans | Equity Lines
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     78
Rate & Interest-Only | Real Estate Loans | Commercial real estate - owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     542
Rate & Interest-Only | Real Estate Loans | Commercial real estate - non-owner occupied
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     6,420
Term & Interest-Only
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   222 6,620
Term & Interest-Only | Commercial and Industrial
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     384
Term & Interest-Only | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   222 6,236
Term & Interest-Only | Real Estate Loans | Other construction/Land
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     6,188
Term & Interest-Only | Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   222 48
Rate, Term & Interest-Only
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   47 518
Rate, Term & Interest-Only | Agricultural
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     12
Rate, Term & Interest-Only | Consumer loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment   47 85
Rate, Term & Interest-Only | Real Estate Loans
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     421
Rate, Term & Interest-Only | Real Estate Loans | 1-4 Family - closed end
      
Financing Receivable, Modifications [Line Items]      
Post-Modification Outstanding, Recorded Investment     $ 421