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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Securities Held-To-Maturity

A summary of the amortized cost and fair value related to securities held-to-maturity as of June 30, 2021 and December 31, 2020 is presented below.

 
Investment Securities
Held-to-maturity:         Gross Unrealized        
(in thousands)   Amortized
Cost		     Gains     (Losses)     Fair
Value		  
June 30, 2021                                
Obligations of state and political subdivisions     6,473       385       —       6,858  
Total held-to-maturity   $ 6,473     $ 385     $ —     $ 6,858  
December 31, 2020                                
Obligations of state and political subdivisions     7,979       776       —       8,755  
Total held-to-maturity   $ 7,979     $ 776     $ —     $ 8,755  
Schedule of Securities Available-for-Sale

A summary of the amortized cost and fair value related to securities available-for-sale as of June 30, 2021 and December 31, 2020 is presented below.

 
Investment Securities (Details 2)
Available-for-sale:         Gross Unrealized        
(in thousands)   Amortized
Cost		     Gains     (Losses)     Fair
Value		  
June 30, 2021                                
Mortgage-backed securities   $ 70,257     $ 179     $ (438 )   $ 69,998  
U.S. government agencies     29,284       215       (255 )     29,244  
U.S. government treasuries     10,058       11       (1 )     10,068  
Obligations of state and political subdivisions     49,440       812       (129 )     50,123  
Collateralized mortgage obligations     626       15       —       641  
Total available-for-sale   $ 159,665     $ 1,232     $ (823 )   $ 160,074  
December 31, 2020                                
Mortgage-backed securities   $ 23,601     $ 338     $ (7 )   $ 23,932  
U.S. government agencies     32,069       111       (352 )     31,828  
Obligations of state and political subdivisions     57,137       1,291       (8 )     58,420  
Collateralized mortgage obligations     748       21       —       769  
Total available-for-sale   $ 113,555     $ 1,761     $ (367 )   $ 114,949  
Schedule of Investment Securities by Contractual Maturity

The amortized cost and fair value of investment debt securities by contractual maturity at June 30, 2021 and December 31, 2020 are shown below. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties.

 
Investment Securities (Details 3)
    June 30, 2021     December 31, 2020  
    Held-to-Maturity     Available-for-Sale     Held-to-Maturity     Available-for-Sale  
(in thousands)   Amortized
Cost		     Fair Value     Amortized
Cost		     Fair Value     Amortized
Cost		     Fair Value     Amortized
Cost		     Fair Value  
Within one year   $ 420     $ 445     $ —     $ —     $ 494     $ 543     $ —     $ —  
After one but within five years     1,950       2,066       510       532       2,143       2,351       1,141       1,206  
After five years through ten years     2,755       2,919       6,713       6,835       2,755       3,023       8,340       8,599  
After ten years     1,348       1,428       42,217       42,756       2,587       2,838       47,656       48,615  
                                                                 
Investment securities not due at a single maturity date:                                                                
Mortgage-backed securities     —       —       70,257       69,998       —       —       23,601       23,932  
Collateralized mortgage obligations     —       —       626       641       —       —       748       769  
U.S. government treasuries     —       —       10,058       10,068       —       —       —       —  
U.S. government agencies     —       —       29,284       29,244       —       —       32,069       31,828  
Total   $ 6,473     $ 6,858     $ 159,665     $ 160,074     $ 7,979     $ 8,755     $ 113,555     $ 114,949  
Schedule of Investment Securities Available-for-Sale Gross Realized Gain and Losses

Sales of investment securities and gross gains and losses are shown in the following table:
Investment Securities (Details 4)
                 
   For the three months ended   For the six months ended 
(in thousands)  June 30, 2021   June 30, 2020   June 30, 2021   June 30, 2020 
Available-for-sale:                    
Sales proceeds  $4,726   $13,538   $16,182   $32,234 
Gross realized gains   92    434    274    966 
Pledged investment securities are shown in the following table:

Pledged investment securities are shown in the following table:

 
Investment Securities (Details 5)
(in thousands)  June 30, 2021   December 31, 2020 
Pledged to the State of California:          
Secure deposits of public funds and borrowings  $48,663   $52,897 
Total pledged investment securities  $48,663   $52,897 
Schedule of securities in a continuous unrealized loss position aggregated by investment category and length of time

The following table details the gross unrealized losses and fair values aggregated by investment category and length of time that individual available-for-sale securities have been in a continuous unrealized loss position at June 30, 2021 and December 31, 2020:

 
Investment Securities (Details 6)
(in thousands)  < 12 continuous months   ≥ 12 continuous months   Total securities
in a loss position		 
   Fair value   Unrealized loss   Fair value   Unrealized loss   Fair value   Unrealized loss 
June 30, 2021                        
Mortgage-backed securities  $53,204   $(438)  $—   $—   $53,204   $(438)
U.S. government agencies   4,021    (43)   11,516    (212)   15,537    (255)
Obligations of state and political subdivisions   15,759    (129)   —    —    15,759    (129)
U.S. government treasuries   2,190    (1)   —    —    2,190    (1)
Total temporarily impaired securities  $75,174   $(611)  $11,516   $(212)  $86,690   $(823)
                               
(in thousands)  < 12 continuous months   ≥ 12 continuous months   Total securities
in a loss position		 
   Fair value   Unrealized loss   Fair value   Unrealized loss   Fair value   Unrealized loss 
December 31, 2020                        
Mortgage-backed securities  $1,786   $(7)  $—   $—   $1,786   $(7)
U.S. government agencies   10,800    (56)   15,195    (296)   25,995    (352)
Obligations of state and political subdivisions   3,922    (8)   —    —    3,922    (8)
Total temporarily impaired securities  $16,508   $(71)  $15,195   $(296)  $31,703   $(367)