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Deposits - Time deposit maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deposits Disclosure [Line Items]    
Time deposits of $100,000 or more $ 1,772,975 $ 1,667,367
Scheduled maturities for time deposits:    
2016 2,251,854  
2017 209,002  
2018 9,826  
2019 4,668  
2020 and thereafter 451  
Time deposits 2,475,801  
California State Treasurer    
Deposits Disclosure [Line Items]    
Time deposits of $100,000 or more $ 300,000  
Required eligible collateral pledge on outstanding deposits, minimum percentage 110.00%  
Carrying values of securities pledged as collateral $ 358,600 $ 364,600