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Acquisitions - Pro Forma Summarized Income Statement Data (Details) - Pacific Rim Bank - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]    
Net interest income $ 42,386 $ 33,616
Provision for loan losses 1,473 235
Noninterest income 19,610 19,074
Noninterest expenses 47,050 43,330
Income before taxes 13,473 9,125
Taxes on income 5,728 4,051
Net income $ 7,745 $ 5,074
Net income per share:    
Basic $ 0.76 $ 0.61
Diluted $ 0.73 $ 0.58