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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 | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) Contract | Dec. 31, 2017 USD ($) Contract | Dec. 31, 2016 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 3 | 2 | 7
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 627 | $ 5,127 | $ 1,286
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 627 | 5,127 | 1,286
Troubled debt restructurings, Outstanding Recorded Investment | 587 | 3,221 | 1,240
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 | 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 | 103
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 | 1 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 38 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 38 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 20 | 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
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  |  | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  | 0
Troubled debt restructurings, Outstanding Recorded Investment |  |  | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  | $ 0
Small Business Administration [Member] | Change in Amortization Period or Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract |  |  | 2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  |  | $ 214
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  | 214
Troubled debt restructurings, Outstanding Recorded Investment |  |  | 196
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  | $ 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 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 759
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 759
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 756
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 | 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] | Interest rate reduction [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 |
SFR Mortgage [Member] | Change in Amortization Period or Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1 | 0 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 311 | $ 0 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 311 | 0 |
Troubled debt restructurings, Outstanding Recorded Investment | 300 | 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
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 | 1 | 0 | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 278 | $ 0 | $ 201
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 278 | 0 | 201
Troubled debt restructurings, Outstanding Recorded Investment | 267 | 0 | 185
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0

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