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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Contract	Mar. 31, 2013 Contract
Non-Covered Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	1	11
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 41	$ 10,345
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	41	10,345
Troubled debt restructurings, Outstanding Recorded Investment	39	10,216
Troubled debt restructurings, Financial Effect Resulting From Modifications		95
Commercial and Industrial [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
Commercial and Industrial [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	1	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	41	204
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	41	204
Troubled debt restructurings, Outstanding Recorded Investment	39	193
Troubled debt restructurings, Financial Effect Resulting From Modifications		95
Commercial Real Estate Owner Occupied [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
Commercial Real Estate Owner Occupied [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		168
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		168
Troubled debt restructurings, Outstanding Recorded Investment		168
Troubled debt restructurings, Financial Effect Resulting From Modifications
SFR Mortgage [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
SFR Mortgage [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
SFR Mortgage [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
Dairy & Livestock and Agribusiness [Member] | Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment
Troubled debt restructurings, Outstanding Recorded Investment
Troubled debt restructurings, Financial Effect Resulting From Modifications
Dairy & Livestock and Agribusiness [Member] | Change in Amortization Period or Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans		8
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		9,973
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		9,973
Troubled debt restructurings, Outstanding Recorded Investment		9,855
Troubled debt restructurings, Financial Effect Resulting From Modifications

X

- Definition

Financial effects resulting from modifications represent charge-offs and specific allowance recorded at modification date.

+ References

No definition available.

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- Definition

Financing receivable modification recorded investment.

+ References

No definition available.

+ Details

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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

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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

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- Definition

Pre-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

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