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Income Taxes Reconciliation from statutory federal income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation from statutory federal income taxes to the company's effective income taxes                      
Statutory federal income tax provision                 $ 14,253 $ 9,459 $ 5,103
California franchise tax, net of federal income tax effect                 2,886 1,926 1,027
Cash surrender life insurance                 (483) (324) (277)
Tax exempt interest                 (742) (614) (718)
Merger costs                 447 410 164
LIHTC investments                 (871) (728) (237)
Other                 (281) 590 525
Total income tax provision $ 4,750 $ 4,801 $ 4,601 $ 1,056 $ 2,889 $ 3,410 $ 2,855 $ 1,565 $ 15,209 $ 10,719 $ 5,587