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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) Contract | Sep. 30, 2014 USD ($) Contract | Sep. 30, 2015 USD ($) Contract | Sep. 30, 2014 USD ($) Contract
Modified Loan [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 2 | 0 | 4 | 6
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 2,698 | $ 0 | $ 3,058 | $ 4,140
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 2,698 | 0 | 3,058 | 4,140
Troubled debt restructurings, Outstanding Recorded Investment | 3,023 | 3,993 | 3,023 | 3,993
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 12 | $ 0
Commercial and Industrial [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 0 | 2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 368
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 368
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 337 | 0 | 337
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Commercial and Industrial [Member] | Change in Amortization Period or Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 1 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 30 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 30 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 15 | 0 | 15 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 12 | 0
Commercial and Industrial [Member] | Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 0 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 |
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | $ 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 |
Small Business Administration [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Small Business Administration [Member] | Change in Amortization Period or Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 1 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 330 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 330 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 325 | 0 | 325 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Small Business Administration [Member] | Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Commercial Real Estate Owner Occupied [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 0 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 199
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 199
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 187 | 0 | 187
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Commercial Real Estate Owner Occupied [Member] | Change in Amortization Period or Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Commercial Real Estate Owner Occupied [Member] | Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 |  | 0 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 |  | $ 0 |
Commercial Real Estate Non-owner Occupied [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1 | 0 | 1 | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 2,376 | $ 0 | $ 2,376 | $ 3,573
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 2,376 | 0 | 2,376 | 3,573
Troubled debt restructurings, Outstanding Recorded Investment | 2,353 | 3,469 | 2,353 | 3,469
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
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 | Contract | 0 | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Commercial Real Estate Non-owner Occupied [Member] | Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 |  | 0 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 |  | $ 0 |
Single Family Mortgage Loans [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1 |  | 1 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 322 |  | $ 322 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 322 |  | 322 |
Troubled debt restructurings, Outstanding Recorded Investment | 330 |  | 330 |
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 |  | $ 0 |
Single Family Mortgage Loans [Member] | Change in Amortization Period or Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 |  | 0 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 |  | $ 0 |
Single Family Mortgage Loans [Member] | Other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 |  | 0 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Outstanding Recorded Investment | 0 |  | 0 |
Troubled debt restructurings, Financial Effect Resulting From Modifications | 0 |  | $ 0 |
Dairy & Livestock and Agribusiness [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract |  | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 0 | $ 0
Dairy & Livestock and Agribusiness [Member] | Change in Amortization Period or Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract |  | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | $ 0 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 0 | $ 0
Consumer [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0

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