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Investment Securities - Securities Sold, Pledged as Collateral and Transfers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 24, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Available-for-sale:            
Sales proceeds   $ 0 $ 0 $ 1,321 $ 68,673  
Gross realized gains   0 0 13 458  
Gross realized losses   0 $ 0 (3) (64)  
Financial Instruments Owned and Pledged as Collateral [Line Items]            
Securities transferred from available-for-sale to held-to-maturity $ 129,000     128,965 $ 0  
Unrealized pre-tax loss from transfer of available-for-sale securities to held-to-maturity $ 3,000          
State of California            
Financial Instruments Owned and Pledged as Collateral [Line Items]            
Available-for-sale securities pledged as collateral   112,400   112,400   $ 109,100
Public Deposits            
Financial Instruments Owned and Pledged as Collateral [Line Items]            
Available-for-sale securities pledged as collateral   111,600   111,600   108,300
Trust Deposits            
Financial Instruments Owned and Pledged as Collateral [Line Items]            
Available-for-sale securities pledged as collateral   777   777   822
Internal checking account            
Financial Instruments Owned and Pledged as Collateral [Line Items]            
Available-for-sale securities pledged as collateral   $ 2,000   $ 2,000   $ 2,100