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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, 2017
Dec. 31, 2016
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 80,352 $ 145,428
Less Than 12 Months, Unrealized Losses 579 2,470
12 Months or More, Fair Value 39,741 4,434
12 Months or More, Unrealized Losses 632 94
Total, Fair Value 120,093 149,862
Total, Unrealized Losses 1,211 2,564
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 551 1,035
Less Than 12 Months, Unrealized Losses 2 39
Total, Fair Value 551 1,035
Total, Unrealized Losses 2 39
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 5,330 55,166
Less Than 12 Months, Unrealized Losses 50 707
12 Months or More, Fair Value 2,482 226
12 Months or More, Unrealized Losses 3  
Total, Fair Value 7,812 55,392
Total, Unrealized Losses 53 707
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 5,494 7,438
Less Than 12 Months, Unrealized Losses 28 132
Total, Fair Value 5,494 7,438
Total, Unrealized Losses 28 132
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 48,573 59,460
Less Than 12 Months, Unrealized Losses 376 1,480
12 Months or More, Fair Value 29,309  
12 Months or More, Unrealized Losses 539  
Total, Fair Value 77,882 59,460
Total, Unrealized Losses 915 1,480
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 5,671 5,917
Less Than 12 Months, Unrealized Losses 13 27
12 Months or More, Fair Value 3,175 1,496
12 Months or More, Unrealized Losses 20 20
Total, Fair Value 8,846 7,413
Total, Unrealized Losses 33 47
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 6,241  
Less Than 12 Months, Unrealized Losses 85  
Total, Fair Value 6,241  
Total, Unrealized Losses 85  
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 8,492 16,412
Less Than 12 Months, Unrealized Losses 25 85
12 Months or More, Fair Value 4,775 2,712
12 Months or More, Unrealized Losses 70 74
Total, Fair Value 13,267 19,124
Total, Unrealized Losses $ 95 $ 159