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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
--- | ---
Mar. 31, 2018 Contract | Mar. 31, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 5,209
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 5,209
Troubled debt restructurings, Outstanding Recorded Investment |  | 3,301
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0
Commercial and Industrial [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
Commercial and Industrial [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
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 |  | 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
Commercial Real Estate Owner Occupied [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
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
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 3,143
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 3,143
Troubled debt restructurings, Outstanding Recorded Investment |  | 3,143
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 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
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
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
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
Dairy & Livestock and Agribusiness [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
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
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
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0
Consumer [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
Consumer [Member] | Change in Amortization Period or Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Troubled debt restructurings, Number of Loans | Contract |  | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 82
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 82
Troubled debt restructurings, Outstanding Recorded Investment |  | 80
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0

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