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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 105,872 $ 139,450
12 Months or More, Fair Value 132,381 68,109
Less Than 12 Months, Unrealized Losses 1,754 1,331
12 Months or More, Unrealized Losses 4,800 1,592
Total, Fair Value 238,253 207,559
Total, Unrealized Losses 6,554 2,923
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 52,220 54,788
12 Months or More, Fair Value 14,529 3,808
Less Than 12 Months, Unrealized Losses 893 454
12 Months or More, Unrealized Losses 353 61
Total, Fair Value 66,749 58,596
Total, Unrealized Losses 1,246 515
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 8,711 17,350
12 Months or More, Fair Value 16,519 2,464
Less Than 12 Months, Unrealized Losses 169 170
12 Months or More, Unrealized Losses 542 58
Total, Fair Value 25,230 19,814
Total, Unrealized Losses 711 228
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 16,813 39,096
12 Months or More, Fair Value 74,959 51,365
Less Than 12 Months, Unrealized Losses 337 445
12 Months or More, Unrealized Losses 2,980 1,295
Total, Fair Value 91,772 90,461
Total, Unrealized Losses 3,317 1,740
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 6,423 9,484
12 Months or More, Fair Value 7,162 3,968
Less Than 12 Months, Unrealized Losses 33 39
12 Months or More, Unrealized Losses 101 46
Total, Fair Value 13,585 13,452
Total, Unrealized Losses 134 85
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 21,705 6,195
12 Months or More, Fair Value 13,261  
Less Than 12 Months, Unrealized Losses 322 120
12 Months or More, Unrealized Losses 494  
Total, Fair Value 34,966 6,195
Total, Unrealized Losses 816 120
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   12,537
12 Months or More, Fair Value 5,951 6,504
Less Than 12 Months, Unrealized Losses   103
12 Months or More, Unrealized Losses 330 132
Total, Fair Value 5,951 19,041
Total, Unrealized Losses $ 330 $ 235