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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, 2018
Dec. 31, 2017
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 25,905 $ 139,450
12 Months or More, Fair Value 189,472 68,109
Less Than 12 Months, Unrealized Losses 132 1,331
12 Months or More, Unrealized Losses 3,924 1,592
Total, Fair Value 215,377 207,559
Total, Unrealized Losses 4,056 2,923
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 9,022 54,788
12 Months or More, Fair Value 52,352 3,808
Less Than 12 Months, Unrealized Losses 74 454
12 Months or More, Unrealized Losses 714 61
Total, Fair Value 61,374 58,596
Total, Unrealized Losses 788 515
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 1,995 17,350
12 Months or More, Fair Value 19,671 2,464
Less Than 12 Months, Unrealized Losses 2 170
12 Months or More, Unrealized Losses 363 58
Total, Fair Value 21,666 19,814
Total, Unrealized Losses 365 228
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,037 39,096
12 Months or More, Fair Value 89,729 51,365
Less Than 12 Months, Unrealized Losses 1 445
12 Months or More, Unrealized Losses 2,182 1,295
Total, Fair Value 91,766 90,461
Total, Unrealized Losses 2,183 1,740
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   9,484
12 Months or More, Fair Value 7,800 3,968
Less Than 12 Months, Unrealized Losses   39
12 Months or More, Unrealized Losses 84 46
Total, Fair Value 7,800 13,452
Total, Unrealized Losses 84 85
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   6,195
12 Months or More, Fair Value 6,039  
Less Than 12 Months, Unrealized Losses   120
12 Months or More, Unrealized Losses 230  
Total, Fair Value 6,039 6,195
Total, Unrealized Losses 230 120
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 12,851 12,537
12 Months or More, Fair Value 13,881 6,504
Less Than 12 Months, Unrealized Losses 55 103
12 Months or More, Unrealized Losses 351 132
Total, Fair Value 26,732 19,041
Total, Unrealized Losses $ 406 $ 235