Annual report pursuant to Section 13 and 15(d)

Investment Securities - Additional Information (Details)

v3.20.4
Investment Securities - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Security
Dec. 31, 2018
USD ($)
Security
Investments Debt And Equity Securities [Abstract]      
Available for sale securities pledged $ 91,500,000 $ 90,600,000  
Debt Securities, Available-for-sale, Restriction Type [Extensible List] us-gaap:CollateralPledgedMember us-gaap:CollateralPledgedMember  
Available for sale, securities number of positions | Security 97    
Available for sale, securities in unrealized loss positions, number of positions | Security 24    
Available for sale securities, gross realized gain (loss), excluding other than temporary impairments $ 0    
Number of securities sold | Security 46 216 0
Equity investments, at fair value $ 24,000,000    
Fair value changes 0    
Taxable interest and dividends on investment securities 2,100,000 $ 4,600,000 $ 1,400,000
Tax-exempt interest on investment securities $ 193,000 $ 541,000 $ 78,000