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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, 2016
Dec. 31, 2015
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 145,428 $ 98,260
Less Than 12 Months, Unrealized Losses 2,470 340
12 Months or More, Fair Value 4,434 13,991
12 Months or More, Unrealized Losses 94 216
Total, Fair Value 149,862 112,251
Total, Unrealized Losses 2,564 556
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  
12 Months or More, Fair Value   532
12 Months or More, Unrealized Losses   32
Total, Fair Value 1,035 532
Total, Unrealized Losses 39 32
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 55,166 21,341
Less Than 12 Months, Unrealized Losses 707 87
12 Months or More, Fair Value 226 1,952
12 Months or More, Unrealized Losses   19
Total, Fair Value 55,392 23,293
Total, Unrealized Losses 707 106
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 7,438 9,999
Less Than 12 Months, Unrealized Losses 132 31
Total, Fair Value 7,438 9,999
Total, Unrealized Losses 132 31
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 59,460 34,159
Less Than 12 Months, Unrealized Losses 1,480 62
Total, Fair Value 59,460 34,159
Total, Unrealized Losses 1,480 62
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 5,917 15,114
Less Than 12 Months, Unrealized Losses 27 56
12 Months or More, Fair Value 1,496 5,477
12 Months or More, Unrealized Losses 20 61
Total, Fair Value 7,413 20,591
Total, Unrealized Losses 47 117
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 16,412 17,647
Less Than 12 Months, Unrealized Losses 85 104
12 Months or More, Fair Value 2,712 6,030
12 Months or More, Unrealized Losses 74 104
Total, Fair Value 19,124 23,677
Total, Unrealized Losses $ 159 $ 208