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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

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