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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
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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

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