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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, 2019
Dec. 31, 2018
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   $ 25,905
12 Months or More, Fair Value $ 113,437 189,472
Less Than 12 Months, Unrealized Losses   132
12 Months or More, Unrealized Losses 585 3,924
Total, Fair Value 113,437 215,377
Total, Unrealized Losses 585 4,056
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   9,022
12 Months or More, Fair Value 14,499 52,352
Less Than 12 Months, Unrealized Losses   74
12 Months or More, Unrealized Losses 32 714
Total, Fair Value 14,499 61,374
Total, Unrealized Losses 32 788
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 7,993 19,671
Less Than 12 Months, Unrealized Losses   2
12 Months or More, Unrealized Losses 17 363
Total, Fair Value 7,993 21,666
Total, Unrealized Losses 17 365
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 75,292 89,729
Less Than 12 Months, Unrealized Losses   1
12 Months or More, Unrealized Losses 423 2,182
Total, Fair Value 75,292 91,766
Total, Unrealized Losses 423 2,183
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
12 Months or More, Fair Value 5,281 7,800
12 Months or More, Unrealized Losses 20 84
Total, Fair Value 5,281 7,800
Total, Unrealized Losses 20 84
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
12 Months or More, Fair Value 10,372 6,039
12 Months or More, Unrealized Losses 93 230
Total, Fair Value 10,372 6,039
Total, Unrealized Losses $ 93 230
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   13,881
Less Than 12 Months, Unrealized Losses   55
12 Months or More, Unrealized Losses   351
Total, Fair Value   26,732
Total, Unrealized Losses   $ 406