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Investment securities - Restricted Investment In Stock (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Available-for-sale and Held-to-maturity securities        
Proceeds from sales of investment securities available-for-sale     $ 26,502 $ 9,677
Number of securities in continuous unrealized loss position | security     15  
Other-than-temporary impairments recognized     $ 0  
U.S. government-sponsored enterprises state and municipals        
Available-for-sale and Held-to-maturity securities        
Other-than-temporary impairments recognized $ 0 $ 0 $ 0 $ 0
Mortgage-backed Securities, U.S. government-sponsored enterprises        
Available-for-sale and Held-to-maturity securities        
Number of securities in continuous unrealized loss positions 12 months or longer | security     8