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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, 2018
Dec. 31, 2017
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 163,696 $ 139,450
12 Months or More, Fair Value 67,289 68,109
Less Than 12 Months, Unrealized Losses 3,171 1,331
12 Months or More, Unrealized Losses 2,433 1,592
Total, Fair Value 230,985 207,559
Total, Unrealized Losses 5,604 2,923
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 61,299 54,788
12 Months or More, Fair Value 3,956 3,808
Less Than 12 Months, Unrealized Losses 820 454
12 Months or More, Unrealized Losses 111 61
Total, Fair Value 65,255 58,596
Total, Unrealized Losses 931 515
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 22,935 17,350
12 Months or More, Fair Value 2,412 2,464
Less Than 12 Months, Unrealized Losses 479 170
12 Months or More, Unrealized Losses 108 58
Total, Fair Value 25,347 19,814
Total, Unrealized Losses 587 228
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 41,517 39,096
12 Months or More, Fair Value 50,531 51,365
Less Than 12 Months, Unrealized Losses 1,142 445
12 Months or More, Unrealized Losses 1,989 1,295
Total, Fair Value 92,048 90,461
Total, Unrealized Losses 3,131 1,740
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 11,211 9,484
12 Months or More, Fair Value 4,328 3,968
Less Than 12 Months, Unrealized Losses 44 39
12 Months or More, Unrealized Losses 65 46
Total, Fair Value 15,539 13,452
Total, Unrealized Losses 109 85
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 5,973 6,195
Less Than 12 Months, Unrealized Losses 319 120
Total, Fair Value 5,973 6,195
Total, Unrealized Losses 319 120
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 20,761 12,537
12 Months or More, Fair Value 6,062 6,504
Less Than 12 Months, Unrealized Losses 367 103
12 Months or More, Unrealized Losses 160 132
Total, Fair Value 26,823 19,041
Total, Unrealized Losses $ 527 $ 235