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Loans Receivable (excluding Covered Loans) - Schedule of Loans Acquired for Which Payment Collection Not Probable (Details) (USD $)	Sep. 30, 2013 South Valley Bancorp, Inc.	Dec. 16, 2011 Western National Bank
Business Acquisition [Line Items]
Acquired loans uncollectible	$ 9,900,000
Contractually required payments of interest and principal		171,515,000
Nonaccretable difference		(56,440,000)
Cash flows expected to be collected		115,075,000	[1]
Accretable yield		(21,384,000)
Carrying value of acquired loans		$ 93,691,000
[1] Represents undiscounted expected principal and interest cash flows

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Fair value at acquisition of acquired commercial loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of cash flows expected to be collected at acquisition of acquired commercial loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of contractually required payments receivable at acquisition of acquired commercial loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Commercial, Accretable Yield

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Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Commercial, Nonaccretable Difference

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