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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 135,000 $ 27,585
12 Months or More, Fair Value 201 284
Less Than 12 Months, Unrealized Losses 3,034 202
12 Months or More, Unrealized Losses 1 1
Total, Fair Value 135,201 27,869
Total, Unrealized Losses 3,035 203
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 24,966 9,246
Less Than 12 Months, Unrealized Losses 514 30
Total, Fair Value 24,966 9,246
Total, Unrealized Losses 514 30
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 29,981 6,786
Less Than 12 Months, Unrealized Losses 621 37
Total, Fair Value 29,981 6,786
Total, Unrealized Losses 621 37
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 77,089  
12 Months or More, Fair Value 201  
Less Than 12 Months, Unrealized Losses 1,863  
12 Months or More, Unrealized Losses 1  
Total, Fair Value 77,290  
Total, Unrealized Losses 1,864  
Mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   11,553
12 Months or More, Fair Value   284
Less Than 12 Months, Unrealized Losses   135
12 Months or More, Unrealized Losses   1
Total, Fair Value   11,837
Total, Unrealized Losses   $ 136
Corporate debt securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,964  
Less Than 12 Months, Unrealized Losses 36  
Total, Fair Value 2,964  
Total, Unrealized Losses $ 36