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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, 2017
Dec. 31, 2016
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 139,450 $ 145,428
Less Than 12 Months, Unrealized Losses 1,331 2,470
12 Months or More, Fair Value 68,109 4,434
12 Months or More, Unrealized Losses 1,592 94
Total, Fair Value 207,559 149,862
Total, Unrealized Losses 2,923 2,564
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   1,035
Less Than 12 Months, Unrealized Losses   39
Total, Fair Value   1,035
Total, Unrealized Losses   39
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 54,788 55,166
Less Than 12 Months, Unrealized Losses 454 707
12 Months or More, Fair Value 3,808 226
12 Months or More, Unrealized Losses 61  
Total, Fair Value 58,596 55,392
Total, Unrealized Losses 515 707
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 17,350 7,438
Less Than 12 Months, Unrealized Losses 170 132
12 Months or More, Fair Value 2,464  
12 Months or More, Unrealized Losses 58  
Total, Fair Value 19,814 7,438
Total, Unrealized Losses 228 132
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 39,096 59,460
Less Than 12 Months, Unrealized Losses 445 1,480
12 Months or More, Fair Value 51,365  
12 Months or More, Unrealized Losses 1,295  
Total, Fair Value 90,461 59,460
Total, Unrealized Losses 1,740 1,480
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 9,484 5,917
Less Than 12 Months, Unrealized Losses 39 27
12 Months or More, Fair Value 3,968 1,496
12 Months or More, Unrealized Losses 46 20
Total, Fair Value 13,452 7,413
Total, Unrealized Losses 85 47
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  
Less Than 12 Months, Unrealized Losses 120  
Total, Fair Value 6,195  
Total, Unrealized Losses 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 16,412
Less Than 12 Months, Unrealized Losses 103 85
12 Months or More, Fair Value 6,504 2,712
12 Months or More, Unrealized Losses 132 74
Total, Fair Value 19,041 19,124
Total, Unrealized Losses $ 235 $ 159