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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, 2017 Contract | Sep. 30, 2016 USD ($) Contract | Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 2 | 3 | 5
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 779 | $ 5,209 | $ 1,109
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 779 | 5,209 | 1,109
Troubled debt restructurings, Outstanding Recorded Investment |  | 773 | 3,297 | 1,167
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 0 | $ 28
Commercial and Industrial [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
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 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
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 0 | $ 0 | $ 112
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 0 | 112
Troubled debt restructurings, Outstanding Recorded Investment |  | 0 | 0 | 184
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
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
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 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 |  | 1 | 0 | 2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 20 | $ 0 | $ 214
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 20 | 0 | 214
Troubled debt restructurings, Outstanding Recorded Investment |  | 14 | 0 | 202
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 0 | $ 28
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
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
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 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 | 1 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 0 | $ 3,143 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 3,143 | 0
Troubled debt restructurings, Outstanding Recorded Investment |  | 0 | 3,143 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 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 |  | 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
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 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 |  | 1 | 0 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 759 | $ 0 | $ 759
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 759 | 0 | 759
Troubled debt restructurings, Outstanding Recorded Investment |  | 759 | 0 | 759
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 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
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 | 1 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 0 | $ 1,984 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 1,984 | 0
Troubled debt restructurings, Outstanding Recorded Investment |  | 0 | 78 | 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
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
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 0 | $ 0
Consumer [Member] | Change in Amortization Period or Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract |  | 0 | 1 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 0 | $ 82 | $ 24
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 82 | 24
Troubled debt restructurings, Outstanding Recorded Investment |  | 0 | 76 | 22
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 0 | $ 0

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