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Loan and Lease Finance Receivables and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 SecurityLoan	Mar. 31, 2012 SecurityLoan
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	11	4
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	$ 10,345	$ 3,354
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	10,345	3,354
Troubled debt restructurings, Outstanding Recorded Investment	10,216	3,349
Non-Covered Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	11	4
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	10,345	3,354
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	10,345	3,354
Troubled debt restructurings, Outstanding Recorded Investment	10,216	3,349
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
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	2	2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	204	2,534
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	204	2,534
Troubled debt restructurings, Outstanding Recorded Investment	193	2,532
Construction - speculative [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
Construction - non-speculative [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
Commercial real estate - owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans	1	1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment	168	307
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment	168	307
Troubled debt restructurings, Outstanding Recorded Investment	168	304
Commercial real estate - non-owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of Loans		1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment		513
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment		513
Troubled debt restructurings, Outstanding Recorded Investment		513
Residential real estate (SFR 1-4) [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
Dairy and livestock [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
Municipal Lease Finance Receivables [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

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