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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract | Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings, Number of Loans | Contract | 2 | 0 | 2 | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 349 | $ 0 | $ 349 | $ 5,209
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 349 | 0 | 349 | 5,209
Troubled debt restructurings, Outstanding Recorded Investment | 338 | 0 | 338 | 3,299
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 | 1 | 0 | 1 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 38 | $ 0 | $ 38 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 38 | 0 | 38 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 31 | 0 | 31 | 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 | 1 | 0 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 311 | $ 0 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 311 | 0 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 307 | 0 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 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 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 311 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 311 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 307 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 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 | 0 | 0 | 0 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 82
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 82
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 0 | 78
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0 | $ 0

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