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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, 2019
Dec. 31, 2018
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 78,239 $ 25,905
12 Months or More, Fair Value 43,281 189,472
Less Than 12 Months, Unrealized Losses 1,035 132
12 Months or More, Unrealized Losses 118 3,924
Total, Fair Value 121,520 215,377
Total, Unrealized Losses 1,153 4,056
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 23,929  
Less Than 12 Months, Unrealized Losses 815  
Total, Fair Value 23,929  
Total, Unrealized Losses 815  
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,684 9,022
12 Months or More, Fair Value 1,098 52,352
Less Than 12 Months, Unrealized Losses 19 74
12 Months or More, Unrealized Losses 1 714
Total, Fair Value 3,782 61,374
Total, Unrealized Losses 20 788
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   1,995
12 Months or More, Fair Value   19,671
Less Than 12 Months, Unrealized Losses   2
12 Months or More, Unrealized Losses   363
Total, Fair Value   21,666
Total, Unrealized Losses   365
U.S. government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 13,695 2,037
12 Months or More, Fair Value 36,070 89,729
Less Than 12 Months, Unrealized Losses 149 1
12 Months or More, Unrealized Losses 78 2,182
Total, Fair Value 49,765 91,766
Total, Unrealized Losses 227 2,183
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 7,800
Less Than 12 Months, Unrealized Losses 1  
12 Months or More, Unrealized Losses 9 84
Total, Fair Value 3,354 7,800
Total, Unrealized Losses 10 84
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
12 Months or More, Fair Value   6,039
12 Months or More, Unrealized Losses   230
Total, Fair Value   6,039
Total, Unrealized Losses   230
Mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 36,939 12,851
12 Months or More, Fair Value 3,751 13,881
Less Than 12 Months, Unrealized Losses 51 55
12 Months or More, Unrealized Losses 30 351
Total, Fair Value 40,690 26,732
Total, Unrealized Losses $ 81 $ 406