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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, 2016 USD ($) Contract | Dec. 31, 2015 USD ($) Contract | Dec. 31, 2014 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 7 | 7 | 8
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 1,286 | $ 4,334 | $ 4,746
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 1,286 | 4,334 | 4,746
Troubled debt restructurings, Outstanding Recorded Investment | 1,240 | 4,266 | 4,597
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 28 | $ 203 | $ 185
Commercial and Industrial [Member] | Interest Rate Reduction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1 | 0 | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 112 | $ 0 | $ 553
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 112 | 0 | 553
Troubled debt restructurings, Outstanding Recorded Investment | 103 | 0 | 522
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 185
Commercial and Industrial [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 | $ 203 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 203 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 203 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 203 | $ 0
Small Business Administration [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 |
Small Business Administration [Member] | Change in Amortization Period or Maturity [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 2 | 1 |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 214 | $ 330 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 214 | 330 |
Troubled debt restructurings, Outstanding Recorded Investment | 196 | 320 |
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 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 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 199
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 0 | 199
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 0 | 187
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 | 2 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 759 | $ 823 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 759 | 823 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 756 | 821 | 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 | 1 | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 2,376 | $ 3,573
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 2,376 | 3,573
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 2,316 | 3,469
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 | 1 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 280 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 280 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 280 | 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 |  | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 |  | $ 421
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 |  | 421
Troubled debt restructurings, Outstanding Recorded Investment | 0 |  | 419
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 | 3 |  | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 201 |  | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 201 |  | 0
Troubled debt restructurings, Outstanding Recorded Investment | 185 |  | 0
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 |
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 |  |  | 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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