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Investment Securities - Securities Sold, Pledged as Collateral and Transfers (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 24, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale:        
Sales proceeds   $ 55,408 $ 68,673 $ 2,099
Gross realized gains   46 458 7
Gross realized losses   (231) (64) (1)
Held-to-maturity:        
Sales proceeds   0 1,265 1,015
Gross realized gains   0 32 73
Gross realized losses   0 0 0
Securities transferred from available-for-sale to held-to-maturity $ 129,000 128,965 0 0
Unrealized pre-tax loss from transfer of available-for-sale securities to held-to-maturity $ 3,000      
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity   426 21 $ 61
State of California        
Available-for-sale:        
Available-for-sale securities pledged as collateral   108,590 109,126  
Public Deposits        
Available-for-sale:        
Available-for-sale securities pledged as collateral   107,829 108,304  
Trust Deposits        
Available-for-sale:        
Available-for-sale securities pledged as collateral   761 822  
Internal checking account        
Available-for-sale:        
Available-for-sale securities pledged as collateral   $ 2,026 $ 2,146