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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, 2019 USD ($) Contract | Dec. 31, 2018 USD ($) Contract | Dec. 31, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 3,000 |  | 2,000
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 627 | $ 5,127
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 627 | 5,127
Troubled debt restructurings, Outstanding Recorded Investment |  | 587 | 3,221
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 0
Commercial and Industrial [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
Commercial and Industrial [Member] | Change in Amortization Period or Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1,000 |  | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | 38 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 38 | 0
Troubled debt restructurings, Outstanding Recorded Investment |  | 20 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 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
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 Owner Occupied [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
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
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | 0 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | $ 0
Troubled debt restructurings, Outstanding Recorded Investment |  | 0 |
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | 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 |  | 1,000
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | 0 | $ 3,143
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 3,143
Troubled debt restructurings, Outstanding Recorded Investment |  | 0 | 3,143
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | 0 | 0
SFR Mortgage [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 | 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 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 | 1,000 |  |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | 311 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 311 |
Troubled debt restructurings, Outstanding Recorded Investment |  | 300 |
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Interest rate reduction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 |  | 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  | $ 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 |  | 1,000
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  |  | $ 1,984
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  | 1,984
Troubled debt restructurings, Outstanding Recorded Investment |  |  | $ 78
Consumer [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 | $ 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 | 1,000 |  | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 278 | 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 278 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 267 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0

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