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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, 2019
Dec. 31, 2018
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 2,214 $ 25,905
12 Months or More, Fair Value 167,699 189,472
Less Than 12 Months, Unrealized Losses 4 132
12 Months or More, Unrealized Losses 2,142 3,924
Total, Fair Value 169,913 215,377
Total, Unrealized Losses 2,146 4,056
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 1,854 9,022
12 Months or More, Fair Value 31,468 52,352
Less Than 12 Months, Unrealized Losses 3 74
12 Months or More, Unrealized Losses 166 714
Total, Fair Value 33,322 61,374
Total, Unrealized Losses 169 788
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 19,799 19,671
Less Than 12 Months, Unrealized Losses   2
12 Months or More, Unrealized Losses 232 363
Total, Fair Value 19,799 21,666
Total, Unrealized Losses 232 365
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   2,037
12 Months or More, Fair Value 90,466 89,729
Less Than 12 Months, Unrealized Losses   1
12 Months or More, Unrealized Losses 1,373 2,182
Total, Fair Value 90,466 91,766
Total, Unrealized Losses 1,373 2,183
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
12 Months or More, Fair Value 6,946 7,800
12 Months or More, Unrealized Losses 56 84
Total, Fair Value 6,946 7,800
Total, Unrealized Losses 56 84
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 360  
12 Months or More, Fair Value 12,873 6,039
Less Than 12 Months, Unrealized Losses 1  
12 Months or More, Unrealized Losses 204 230
Total, Fair Value 13,233 6,039
Total, Unrealized Losses 205 230
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   12,851
12 Months or More, Fair Value 6,147 13,881
Less Than 12 Months, Unrealized Losses   55
12 Months or More, Unrealized Losses 111 351
Total, Fair Value 6,147 26,732
Total, Unrealized Losses $ 111 $ 406