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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		9 Months Ended
	Sep. 30, 2013 SecurityLoan	Sep. 30, 2012 SecurityLoan	Sep. 30, 2013 SecurityLoan	Sep. 30, 2012 SecurityLoan
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	3	11	12	28
Troubled debt restructurings, pre-modification outstanding recorded investment	$ 3,676	$ 9,331	$ 19,281	$ 33,480
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	3,676	9,698	19,281	33,847
Troubled debt restructurings, Outstanding Recorded Investment	3,590	10,831	16,434	33,344
Troubled debt restructurings, Financial Effect Resulting From Modifications		102	122	105
Non-Covered Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	3	11	12	28
Troubled debt restructurings, pre-modification outstanding recorded investment	3,676	9,331	19,281	33,480
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	3,676	9,698	19,281	33,847
Troubled debt restructurings, Outstanding Recorded Investment	3,590	10,831	16,434	33,344
Troubled debt restructurings, Financial Effect Resulting From Modifications		102	122	105
Covered Loans [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] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans				1
Troubled debt restructurings, pre-modification outstanding recorded investment				80
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment				80
Troubled debt restructurings, Outstanding Recorded Investment				74
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	4	8
Troubled debt restructurings, pre-modification outstanding recorded investment	34	268	265	1,890
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	34	135	265	1,757
Troubled debt restructurings, Outstanding Recorded Investment	34	121	223	1,270
Troubled debt restructurings, Financial Effect Resulting From Modifications		102	122	105
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	1	4
Troubled debt restructurings, pre-modification outstanding recorded investment		853	168	3,921
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		853	168	3,921
Troubled debt restructurings, Outstanding Recorded Investment		853	143	3,916
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	2	4	7	8
Troubled debt restructurings, pre-modification outstanding recorded investment	3,642	5,060	18,848	9,447
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	3,642	5,560	18,848	9,947
Troubled debt restructurings, Outstanding Recorded Investment	3,556	6,797	16,068	10,804
Troubled debt restructurings, Financial Effect Resulting From Modifications
Commercial real estate Non-owner occupied [Member] | Interest rate reduction [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans				2
Troubled debt restructurings, pre-modification outstanding recorded investment				3,891
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment				3,891
Troubled debt restructurings, Outstanding Recorded Investment				3,865
Troubled debt restructurings, Financial Effect Resulting From Modifications
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		2		2
Troubled debt restructurings, pre-modification outstanding recorded investment		2,631		2,766
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		2,631		2,766
Troubled debt restructurings, Outstanding Recorded Investment		2,588		2,325
Troubled debt restructurings, Financial Effect Resulting From Modifications
Construction Speculative [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
Construction Speculative [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				10,966
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment				10,966
Troubled debt restructurings, Outstanding Recorded Investment				10,618
Troubled debt restructurings, Financial Effect Resulting From Modifications
Municipal lease finance receivables [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
Municipal lease finance receivables [Member] | Change in amortization period or maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans		2		2
Troubled debt restructurings, pre-modification outstanding recorded investment		519		519
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		519		519
Troubled debt restructurings, Outstanding Recorded Investment		472		472
Troubled debt restructurings, Financial Effect Resulting From Modifications

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- Definition

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

+ References

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Financing receivable modification recorded investment.

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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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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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