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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 27,585 $ 78,239
12 Months or More, Fair Value 284 43,281
Less Than 12 Months, Unrealized Losses 202 1,035
12 Months or More, Unrealized Losses 1 118
Total, Fair Value 27,869 121,520
Total, Unrealized Losses 203 1,153
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 9,246 23,929
Less Than 12 Months, Unrealized Losses 30 815
Total, Fair Value 9,246 23,929
Total, Unrealized Losses 30 815
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 6,786 2,684
12 Months or More, Fair Value   1,098
Less Than 12 Months, Unrealized Losses 37 19
12 Months or More, Unrealized Losses   1
Total, Fair Value 6,786 3,782
Total, Unrealized Losses 37 20
U.S. government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   13,695
12 Months or More, Fair Value   36,070
Less Than 12 Months, Unrealized Losses   149
12 Months or More, Unrealized Losses   78
Total, Fair Value   49,765
Total, Unrealized Losses   227
Mortgage-backed Securities, U.S. government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   992
12 Months or More, Fair Value   2,362
Less Than 12 Months, Unrealized Losses   1
12 Months or More, Unrealized Losses   9
Total, Fair Value   3,354
Total, Unrealized Losses   10
Mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 11,553 36,939
12 Months or More, Fair Value 284 3,751
Less Than 12 Months, Unrealized Losses 135 51
12 Months or More, Unrealized Losses 1 30
Total, Fair Value 11,837 40,690
Total, Unrealized Losses $ 136 $ 81