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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, 2017 USD ($) Contract | Dec. 31, 2016 USD ($) Contract | Dec. 31, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 2 | 7 | 7
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 5,127 | $ 1,286 | $ 4,334
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 5,127 | 1,286 | 4,334
Troubled debt restructurings, Outstanding Recorded Investment | 3,221 | 1,240 | 4,266
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 28 | $ 203
Commercial and Industrial [Member] | Interest Rate Reduction [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 | $ 112 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 112 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 103 | 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 | $ 203
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 203
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 203
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 203
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 | 0 | 2 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 214 | $ 330
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 214 | 330
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 196 | 320
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 28 | $ 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
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 | 1 | 0 | 2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 3,143 | $ 0 | $ 823
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 3,143 | 0 | 823
Troubled debt restructurings, Outstanding Recorded Investment | 3,143 | 0 | 821
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 | 1 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 759 | $ 2,376
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 759 | 2,376
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 756 | 2,316
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 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 280
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 280
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 280
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 | 1 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 1,984 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 1,984 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 78 | 0 | 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 |
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 |
Consumer [Member] | Change in Amortization Period or Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 3 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 201 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 201 |
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 185 |
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 |  |  | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  |  | $ 322
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  |  | 322
Troubled debt restructurings, Outstanding Recorded Investment |  |  | 326
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  | $ 0
SFR Mortgage [Member] | Change in Amortization Period or Maturity [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

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