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Investment Securities - Securities Sold and Pledged as Collateral (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Available-for-sale:      
Sales proceeds $ 54,985 $ 1,559  
Gross realized gains 110 $ 8  
State of California      
Available-for-sale:      
Available-for-sale securities pledged as collateral 84,800   $ 87,900
Public Deposits      
Available-for-sale:      
Available-for-sale securities pledged as collateral 84,000   87,100
Trust Deposits      
Available-for-sale:      
Available-for-sale securities pledged as collateral 836   840
Internal checking account      
Available-for-sale:      
Available-for-sale securities pledged as collateral $ 1,100   $ 1,100