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Non-Covered Loans and Lease Finance Receivables and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2011 Contract | Dec. 31, 2013 Non-Covered Loans [Member] Contract | Dec. 31, 2012 Non-Covered Loans [Member] Contract | Dec. 31, 2011 Commercial and Industrial [Member] Contract | Dec. 31, 2013 Commercial and Industrial [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2012 Commercial and Industrial [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2013 Commercial and Industrial [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2012 Commercial and Industrial [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2011 Commercial Real Estate Owner Occupied [Member] Contract | Dec. 31, 2013 Commercial Real Estate Owner Occupied [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2012 Commercial Real Estate Owner Occupied [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2013 Commercial Real Estate Owner Occupied [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2012 Commercial Real Estate Owner Occupied [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2011 Single Family Mortgage Loans [Member] Contract | Dec. 31, 2013 Single Family Mortgage Loans [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2012 Single Family Mortgage Loans [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2013 Single Family Mortgage Loans [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2012 Single Family Mortgage Loans [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2011 Dairy & Livestock and Agribusiness [Member] Contract | Dec. 31, 2013 Dairy & Livestock and Agribusiness [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2012 Dairy & Livestock and Agribusiness [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2013 Dairy & Livestock and Agribusiness [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2012 Dairy & Livestock and Agribusiness [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2011 Commercial Real Estate Non-owner Occupied [Member] Contract | Dec. 31, 2012 Commercial Real Estate Non-owner Occupied [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2012 Commercial Real Estate Non-owner Occupied [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2011 Construction Speculative [Member] Contract | Dec. 31, 2012 Construction Speculative [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2012 Construction Speculative [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2012 Municipal Lease Finance Receivables [Member] Interest Rate Reduction [Member] Contract | Dec. 31, 2012 Municipal Lease Finance Receivables [Member] Change in Amortization Period or Maturity [Member] Contract | Dec. 31, 2011 Construction Non-speculative [Member] Contract
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructurings, Number of Loans |  | 25 | 18 | 31 | 5 |  | 1 | 4 | 8 | 3 |  |  | 1 | 6 | 6 | 3 | 1 |  |  | 5 |  |  | 10 | 7 | 3 | 1 | 4 | 2 |  | 1 |  | 2 | 1
Troubled debt restructurings, pre-modification outstanding recorded investment | $ 0 | $ 56,592,000 | $ 29,069,000 | $ 37,221,000 | $ 1,673,000 |  | $ 80,000 | $ 621,000 | $ 2,301,000 | $ 3,195,000 |  |  | $ 168,000 | $ 4,225,000 | $ 2,162,000 | $ 1,365,000 | $ 399,000 |  |  | $ 11,750,000 |  |  | $ 26,915,000 | $ 9,447,000 | $ 11,707,000 | $ 3,378,000 | $ 5,906,000 | $ 16,886,000 |  | $ 10,966,000 |  | $ 519,000 | $ 9,219,000
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment |  | 56,290,000 | 29,069,000 | 37,221,000 | 1,372,000 |  | 80,000 | 621,000 | 2,301,000 | 3,195,000 |  |  | 168,000 | 4,225,000 | 2,161,000 | 1,365,000 | 399,000 |  |  | 11,750,000 |  |  | 26,915,000 | 9,447,000 | 11,707,000 | 3,378,000 | 5,906,000 | 16,886,000 |  | 10,966,000 |  | 519,000 | 9,219,000
Troubled debt restructurings, Outstanding Recorded Investment |  | 49,851,000 | 24,719,000 | 34,956,000 | 1,224,000 |  | 66,000 | 570,000 | 1,817,000 | 3,067,000 |  |  | 138,000 | 3,903,000 | 2,049,000 | 1,349,000 | 398,000 |  |  | 8,662,000 |  |  | 22,662,000 | 9,184,000 | 10,236,000 | 3,359,000 | 5,303,000 | 15,394,000 |  | 10,663,000 |  | 263,000 | 9,219,000
Troubled debt restructurings, Financial Effect Resulting From Modifications |  |  | $ 244,000 | $ 3,000 |  |  |  | $ 95,000 | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 149,000 |  |  |  |  |  |  |  |  |  |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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