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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, 2018 USD ($) Contract | Sep. 30, 2017 USD ($) Contract | Sep. 30, 2018 USD ($) Contract | Sep. 30, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1 | 0 | 3 | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 278 | $ 0 | $ 627 | $ 5,209
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 278 | 0 | 627 | 5,209
Troubled debt restructurings, Outstanding Recorded Investment | 272 | 0 | 603 | 3,297
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0
Commercial and Industrial [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
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 | $ 38 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 38 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 27 | 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 | 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] | Change in Amortization Period or Maturity [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 | $ 3,143
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 3,143
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 3,143
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 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 | 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] | 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
SFR Mortgage [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 |
SFR Mortgage [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 | $ 311 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 311 |
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 304 |
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 | 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
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 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 1,984
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 1,984
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 78
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 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
Consumer [Member] | Change in Amortization Period or Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1 | 0 | 1 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 278 | $ 0 | $ 278 | $ 82
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 278 | 0 | 278 | 82
Troubled debt restructurings, Outstanding Recorded Investment | 272 | 0 | 272 | 76
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0

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