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Borrowing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2020
Apr. 15, 2016
Jun. 30, 2019
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Short-term Debt [Line Items]            
FHLB Advance, Collateral Pledged         $ 170,000,000 $ 188,800,000
FHLB Advance, Available Borrowing Capacity         $ 104,000,000 133,800,000
FHLB Advance, Amount Of Advances     $ 10,000,000      
FHLB Advance, Term     2 years      
FHLB Advance, Maturity Date         2021  
FHLB Advance, Interest Rate         1.89%  
Security Owned And Pledged As Collateral         $ 0 0
Junior Subordinated debt securities         4,986,000 4,977,000
Junior Subordinated Debt [Member]            
Short-term Debt [Line Items]            
Debt Instrument, Face Amount   $ 5,000,000        
Debt Instrument, IssuanceDate   Apr. 15, 2016        
Debt Instrument, Interest Rate Terms   The subordinated debt has a fixed interest rate of 5.875% for the first 5 years        
Debt Instrument, Fixed Interest Rate   5.875%        
Related issuance costs   $ 87,000        
Junior Subordinated debt securities           5,000,000
Prime Rate [Member] | Junior Subordinated Debt [Member]            
Short-term Debt [Line Items]            
Debt Instrument, Variable Interest Rate Basis   variable rate of Prime plus 2.00%        
Debt Instrument, Variable Rate   2.00%        
Correspondent Banks [Member]            
Short-term Debt [Line Items]            
Borrowings outstanding     $ 0   0  
Line Of Credit Maximum Borrowing Capacity         61,000,000  
Correspondent Banks [Member] | Repurchase Agreement [Member]            
Short-term Debt [Line Items]            
Line Of Credit Maximum Borrowing Capacity         10,000,000  
Secured Debt [Member]            
Short-term Debt [Line Items]            
Line Of Credit Maximum Borrowing Capacity         $ 12,000,000  
Line of Credit Facility, Expiration Period         3 years  
Line Of Credit, Fixed Interest Rate       3.95%    
Secured Debt [Member] | Federal Reserve Bank of San Francisco [Member]            
Short-term Debt [Line Items]            
Loans Pledged As Collateral         $ 537,600,000 193,700,000
Line Of Credit Available Borrowing Capacity         450,100,000 127,300,000
Borrowings outstanding           0
Revolving Credit Facility [Member]            
Short-term Debt [Line Items]            
Borrowings outstanding         $ 0 $ 0
Line Of Credit Maximum Borrowing Capacity       $ 3,000,000    
Revolving Credit Facility [Member] | One Year Prime Rate [Member]            
Short-term Debt [Line Items]            
Debt Instrument, Variable Interest Rate Basis         six month term at a rate of Prime plus 0.40% one-year at a rate of Prime plus 0.40%
Debt Instrument, Variable Rate         0.40%  
Paycheck Protection Liquidity Facility [Member]            
Short-term Debt [Line Items]            
Line Of Credit Maximum Borrowing Capacity $ 332,700,000          
Line of Credit Facility, Expiration Period 2 years          
Line Of Credit, Fixed Interest Rate 0.35%