Goodwill and Other Intangible Assets - Additional Information (Detail) |
Mar. 18, 2016
USD ($)
Branches
|
Oct. 03, 2014
USD ($)
|
Sep. 23, 2011
USD ($)
|
May 28, 2010
USD ($)
|
---|---|---|---|---|
North Valley Bancorp [Member] | ||||
Finite-Lived Intangible Assets [Line Items] | ||||
Additions to core deposit intangibles | $ 6,614,000 | |||
Citizens [Member] | ||||
Finite-Lived Intangible Assets [Line Items] | ||||
Additions to core deposit intangibles | $ 898,000 | |||
Bank of America [Member] | ||||
Finite-Lived Intangible Assets [Line Items] | ||||
Additions to core deposit intangibles | $ 2,046,000 | |||
Number of branches | Branches | 3 | |||
Granite [Member] | ||||
Finite-Lived Intangible Assets [Line Items] | ||||
Additions to core deposit intangibles | $ 562,000 |