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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 44,576 | $ 98,260
Less Than 12 Months, Unrealized Losses | 74 | 340
12 Months or More, Fair Value | 9,983 | 13,991
12 Months or More, Unrealized Losses | 130 | 216
Total, Fair Value | 54,559 | 112,251
Total, Unrealized Losses | 204 | 556
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
12 Months or More, Fair Value | 551 | 532
12 Months or More, Unrealized Losses | 11 | 32
Total, Fair Value | 551 | 532
Total, Unrealized Losses | 11 | 32
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 14,675 | 21,341
Less Than 12 Months, Unrealized Losses | 29 | 87
12 Months or More, Fair Value | 1,366 | 1,952
12 Months or More, Unrealized Losses | 5 | 19
Total, Fair Value | 16,041 | 23,293
Total, Unrealized Losses | 34 | 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 | 10,987 | 34,159
Less Than 12 Months, Unrealized Losses | 7 | 62
Total, Fair Value | 10,987 | 34,159
Total, Unrealized Losses | 7 | 62
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 5,435 | 15,114
Less Than 12 Months, Unrealized Losses | 11 | 56
12 Months or More, Fair Value | 5,164 | 5,477
12 Months or More, Unrealized Losses | 34 | 61
Total, Fair Value | 10,599 | 20,591
Total, Unrealized Losses | 45 | 117
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 13,479 | 17,647
Less Than 12 Months, Unrealized Losses | 27 | 104
12 Months or More, Fair Value | 2,902 | 6,030
12 Months or More, Unrealized Losses | 80 | 104
Total, Fair Value | 16,381 | 23,677
Total, Unrealized Losses | $ 107 | $ 208

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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