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Investment Securities - Securities Sold and Pledged as Collateral (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Available-for-sale:          
Sales proceeds $ 0 $ 0 $ 68,673 $ 1,559  
Gross realized gains 0 0 458 8  
Gross realized losses 0 0 (64) 0  
Held-to-maturity Securities, Sales, Excluding Other than Temporary Impairments [Abstract]          
Sales proceeds 0 1,015 0 1,015  
Gross realized gains 0 72 0 72  
Gross realized losses 0 $ 0 0 $ 0  
State of California          
Available-for-sale:          
Available-for-sale securities pledged as collateral 70,700   70,700   $ 87,900
Public Deposits          
Available-for-sale:          
Available-for-sale securities pledged as collateral 69,900   69,900   87,100
Trust Deposits          
Available-for-sale:          
Available-for-sale securities pledged as collateral 827   827   840
Internal checking account          
Available-for-sale:          
Available-for-sale securities pledged as collateral $ 2,100   $ 2,100   $ 1,100