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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 142,494 $ 27,585
12 Months or More, Fair Value 243 284
Less Than 12 Months, Unrealized Losses 4,897 202
12 Months or More, Unrealized Losses 1 1
Total, Fair Value 142,737 27,869
Total, Unrealized Losses 4,898 203
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 28,025 9,246
Less Than 12 Months, Unrealized Losses 1,251 30
Total, Fair Value 28,025 9,246
Total, Unrealized Losses 1,251 30
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 30,795 6,786
Less Than 12 Months, Unrealized Losses 779 37
Total, Fair Value 30,795 6,786
Total, Unrealized Losses 779 37
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 82,687  
12 Months or More, Fair Value 243  
Less Than 12 Months, Unrealized Losses 2,854  
12 Months or More, Unrealized Losses 1  
Total, Fair Value 82,930  
Total, Unrealized Losses 2,855  
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 987  
Less Than 12 Months, Unrealized Losses 13  
Total, Fair Value 987  
Total, Unrealized Losses $ 13