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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, 2016
Dec. 31, 2015
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 4,090 $ 98,260
Less Than 12 Months, Unrealized Losses 2 340
12 Months or More, Fair Value 5,135 13,991
12 Months or More, Unrealized Losses 91 216
Total, Fair Value 9,225 112,251
Total, Unrealized Losses 93 556
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
12 Months or More, Fair Value   532
12 Months or More, Unrealized Losses   32
Total, Fair Value   532
Total, Unrealized Losses   32
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,749 21,341
Less Than 12 Months, Unrealized Losses 1 87
12 Months or More, Fair Value 633 1,952
12 Months or More, Unrealized Losses 1 19
Total, Fair Value 3,382 23,293
Total, Unrealized Losses 2 106
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   9,999
Less Than 12 Months, Unrealized Losses   31
Total, Fair Value   9,999
Total, Unrealized Losses   31
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   34,159
Less Than 12 Months, Unrealized Losses   62
Total, Fair Value   34,159
Total, Unrealized Losses   62
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value   15,114
Less Than 12 Months, Unrealized Losses   56
12 Months or More, Fair Value 1,844 5,477
12 Months or More, Unrealized Losses 13 61
Total, Fair Value 1,844 20,591
Total, Unrealized Losses 13 117
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 1,341 17,647
Less Than 12 Months, Unrealized Losses 1 104
12 Months or More, Fair Value 2,658 6,030
12 Months or More, Unrealized Losses 77 104
Total, Fair Value 3,999 23,677
Total, Unrealized Losses $ 78 $ 208