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Loan and Lease Finance Receivables and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 SecurityLoan | Jun. 30, 2012 SecurityLoan | Jun. 30, 2013 SecurityLoan | Jun. 30, 2012 SecurityLoan
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | 4 | 15 | 10 | 19
Troubled debt restructurings, pre-modification outstanding recorded investment | $ 11,147,000 | $ 20,197,000 | $ 15,606,000 | $ 23,551,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 11,147,000 | 20,197,000 | 15,606,000 | 23,551,000
Troubled debt restructurings, Outstanding Recorded Investment | 10,960,000 | 19,461,000 | 15,606,000 | 22,810,000
Troubled debt restructurings, Financial Effect Resulting From Modifications | 28,000 | 3,000 | 122,000 | 3,000
Non-Covered Loans [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | 4 | 15 | 10 | 19
Troubled debt restructurings, pre-modification outstanding recorded investment | 11,147,000 | 20,197,000 | 15,606,000 | 23,551,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 11,147,000 | 20,197,000 | 15,606,000 | 23,551,000
Troubled debt restructurings, Outstanding Recorded Investment | 10,960,000 | 19,461,000 | 15,606,000 | 22,810,000
Troubled debt restructurings, Financial Effect Resulting From Modifications | 28,000 | 3,000 | 122,000 | 3,000
Covered Loans [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  |  |  |
Troubled debt restructurings, pre-modification outstanding recorded investment |  |  |  |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Commercial and Industrial [Member] | Interest rate reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  |  |  | 1
Troubled debt restructurings, pre-modification outstanding recorded investment |  |  |  | 80,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  |  | 80,000
Troubled debt restructurings, Outstanding Recorded Investment |  |  |  | 74,000
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Commercial and Industrial [Member] | Change in amortization period or maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | 1 | 7 | 3 | 8
Troubled debt restructurings, pre-modification outstanding recorded investment | 28,000 | 1,677,000 | 231,000 | 4,131,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 28,000 | 1,677,000 | 231,000 | 4,131,000
Troubled debt restructurings, Outstanding Recorded Investment | 28,000 | 1,350,000 | 207,000 | 3,808,000
Troubled debt restructurings, Financial Effect Resulting From Modifications | 28,000 | 3,000 | 122,000 | 3,000
Commercial Real Estate Owner occupied [Member] | Interest rate reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  |  |  |
Troubled debt restructurings, pre-modification outstanding recorded investment |  |  |  |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Commercial Real Estate Owner occupied [Member] | Change in amortization period or maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  | 1 | 1 | 2
Troubled debt restructurings, pre-modification outstanding recorded investment |  | 307,000 | 168,000 | 614,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 307,000 | 168,000 | 614,000
Troubled debt restructurings, Outstanding Recorded Investment |  | 306,000 | 158,000 | 610,000
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Commercial real estate Non-owner occupied [Member] | Interest rate reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  |  |  |
Troubled debt restructurings, pre-modification outstanding recorded investment |  |  |  |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Commercial real estate Non-owner occupied [Member] | Change in amortization period or maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  | 1 |  | 2
Troubled debt restructurings, pre-modification outstanding recorded investment |  | 3,378,000 |  | 3,891,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 3,378,000 |  | 3,891,000
Troubled debt restructurings, Outstanding Recorded Investment |  | 3,359,000 |  | 3,865,000
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Commercial real estate Non-owner occupied [Member] | Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  | 1 |  | 1
Troubled debt restructurings, pre-modification outstanding recorded investment |  | 648,000 |  | 648,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 648,000 |  | 648,000
Troubled debt restructurings, Outstanding Recorded Investment |  | 309,000 |  | 316,000
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Dairy & livestock and agribusiness [Member] | Interest rate reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  |  |  |
Troubled debt restructurings, pre-modification outstanding recorded investment |  |  |  |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Dairy & livestock and agribusiness [Member] | Change in amortization period or maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | 3 | 4 | 6 | 4
Troubled debt restructurings, pre-modification outstanding recorded investment | 11,119,000 | 3,221,000 | 15,207,000 | 3,221,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 11,119,000 | 3,221,000 | 15,207,000 | 3,221,000
Troubled debt restructurings, Outstanding Recorded Investment | 10,932,000 | 3,221,000 | 15,136,000 | 3,221,000
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Construction Speculative [Member] | Interest rate reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  |  |  |
Troubled debt restructurings, pre-modification outstanding recorded investment |  |  |  |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Outstanding Recorded Investment |  |  |  |
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  |  |
Construction Speculative [Member] | Change in amortization period or maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans |  | 1 |  | 1
Troubled debt restructurings, pre-modification outstanding recorded investment |  | 10,966,000 |  | 10,966,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 10,966,000 |  | 10,966,000
Troubled debt restructurings, Outstanding Recorded Investment |  | $ 10,916,000 |  | $ 10,916,000

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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