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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, 2018
Dec. 31, 2017
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 151,815 $ 139,450
12 Months or More, Fair Value 66,322 68,109
Less Than 12 Months, Unrealized Losses 2,734 1,331
12 Months or More, Unrealized Losses 2,204 1,592
Total, Fair Value 218,137 207,559
Total, Unrealized Losses 4,938 2,923
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 61,928 54,788
12 Months or More, Fair Value 4,109 3,808
Less Than 12 Months, Unrealized Losses 844 454
12 Months or More, Unrealized Losses 88 61
Total, Fair Value 66,037 58,596
Total, Unrealized Losses 932 515
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 19,143 17,350
12 Months or More, Fair Value 2,429 2,464
Less Than 12 Months, Unrealized Losses 366 170
12 Months or More, Unrealized Losses 92 58
Total, Fair Value 21,572 19,814
Total, Unrealized Losses 458 228
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 39,607 39,096
12 Months or More, Fair Value 50,763 51,365
Less Than 12 Months, Unrealized Losses 950 445
12 Months or More, Unrealized Losses 1,827 1,295
Total, Fair Value 90,370 90,461
Total, Unrealized Losses 2,777 1,740
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 9,190 9,484
12 Months or More, Fair Value 3,592 3,968
Less Than 12 Months, Unrealized Losses 54 39
12 Months or More, Unrealized Losses 52 46
Total, Fair Value 12,782 13,452
Total, Unrealized Losses 106 85
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 6,303 6,195
Less Than 12 Months, Unrealized Losses 263 120
Total, Fair Value 6,303 6,195
Total, Unrealized Losses 263 120
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 15,644 12,537
12 Months or More, Fair Value 5,429 6,504
Less Than 12 Months, Unrealized Losses 257 103
12 Months or More, Unrealized Losses 145 132
Total, Fair Value 21,073 19,041
Total, Unrealized Losses $ 402 $ 235