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BUSINESS COMBINATIONS AND BRANCH SALES - Unaudited Proforma Information (Detail) (The Private Bank of California, The Palisades Group, LLC and CS Financial, USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
The Private Bank of California, The Palisades Group, LLC and CS Financial
        
Business Acquisition [Line Items]        
Net interest income $ 38,186 $ 26,977 $ 108,946 $ 74,369
Provision for loan and lease losses 2,780 2,125 6,817 7,054
Noninterest income 44,098 23,446 104,748 82,237
Noninterest expense 67,557 58,416 185,790 148,692
Income (loss) before income taxes 11,947 (10,118) 21,087 860
Income tax expense (benefit) 721 (1,077) 983 2,735
Net income (loss) $ 11,226 $ (9,041) $ 20,104 $ (1,875)
Basic earnings (loss) per total common share (in usd per share) $ 0.31 $ (0.55) $ 0.64 $ (0.20)
Diluted earnings (loss) per total common share (in usd per share) $ 0.30 $ (0.55) $ 0.63 $ (0.20)