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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, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 98,260 | $ 68,948
Less Than 12 Months, Unrealized Losses | 340 | 449
12 Months or More, Fair Value | 13,991 | 10,921
12 Months or More, Unrealized Losses | 216 | 114
Total, Fair Value | 112,251 | 79,869
Total, Unrealized Losses | 556 | 563
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or More, Fair Value | 532 | 544
12 Months or More, Unrealized Losses | 32 | 26
Total, Fair Value | 532 | 544
Total, Unrealized Losses | 32 | 26
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 21,341 | 4,702
Less Than 12 Months, Unrealized Losses | 87 | 23
12 Months or More, Fair Value | 1,952 | 2,423
12 Months or More, Unrealized Losses | 19 | 39
Total, Fair Value | 23,293 | 7,125
Total, Unrealized Losses | 106 | 62
U.S. Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
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 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 34,159 | 21,228
Less Than 12 Months, Unrealized Losses | 62 | 33
12 Months or More, Fair Value |  | 7,954
12 Months or More, Unrealized Losses |  | 49
Total, Fair Value | 34,159 | 29,182
Total, Unrealized Losses | 62 | 82
Mortgage-Backed Securities, U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 15,114 | 20,148
Less Than 12 Months, Unrealized Losses | 56 | 167
12 Months or More, Fair Value | 5,477 |
12 Months or More, Unrealized Losses | 61 |
Total, Fair Value | 20,591 | 20,148
Total, Unrealized Losses | 117 | 167
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 17,647 | 22,870
Less Than 12 Months, Unrealized Losses | 104 | 226
12 Months or More, Fair Value | 6,030 |
12 Months or More, Unrealized Losses | 104 |
Total, Fair Value | 23,677 | 22,870
Total, Unrealized Losses | $ 208 | $ 226

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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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