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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, 2015 USD ($) Contract | Dec. 31, 2014 USD ($) Contract | Dec. 31, 2013 USD ($) Contract
American Security Bank [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract |  | 6 |
Interest Rate Reduction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract |  | 3 |
Modified Loan [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 7 | 8 | 18
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 4,334 | $ 4,746 | $ 29,069
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 4,334 | 4,746 | 29,069
Troubled debt restructurings, Outstanding Recorded Investment | 4,266 | 4,597 | 24,719
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 203 | $ 185 | $ 244
Commercial and Industrial [Member] | Interest Rate Reduction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 0 | 3 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 553 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 553 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 522 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 185 | $ 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 | 4
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 203 | $ 0 | $ 621
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 203 | 0 | 621
Troubled debt restructurings, Outstanding Recorded Investment | 203 | 0 | 570
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 203 | $ 0 | $ 95
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 | 1 |  |
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 330 |  |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 330 |  |
Troubled debt restructurings, Outstanding Recorded Investment | 320 |  |
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 | 1 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 0 | $ 199 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 0 | 199 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 0 | 187 | 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 | 2 | 0 | 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 823 | $ 0 | $ 168
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 823 | 0 | 168
Troubled debt restructurings, Outstanding Recorded Investment | 821 | 0 | 138
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 | 1 | 3 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 2,376 | $ 3,573 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 2,376 | 3,573 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 2,316 | 3,469 | 0
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 | 1 | 0 | 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 280 | $ 0 | $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 280 | 0 | 0
Troubled debt restructurings, Outstanding Recorded Investment | 280 | 0 | 0
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 | $ 0 | $ 0
Single Family Mortgage Loans [Member] | Interest Rate Reduction [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructurings, Number of Loans | Contract | 1 |  | 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment | $ 322 |  | $ 1,365
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment | 322 |  | 1,365
Troubled debt restructurings, Outstanding Recorded Investment | 326 |  | 1,349
Troubled debt restructurings, Financial Effect Resulting From Modifications | $ 0 |  | $ 0
Single Family Mortgage Loans [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
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, 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
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 | 10
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment |  | $ 0 | $ 26,915
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 0 | 26,915
Troubled debt restructurings, Outstanding Recorded Investment |  | 0 | 22,662
Troubled debt restructurings, Financial Effect Resulting From Modifications |  | $ 0 | $ 149
Consumer [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 |  | $ 421 |
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 421 |
Troubled debt restructurings, Outstanding Recorded Investment |  | 419 |
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 |  | 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 |
Construction Speculative [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
Construction Speculative [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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