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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details 5) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 54,736 | $ 68,948
Less Than 12 Months, Unrealized Losses | 353 | 449
12 Months or More, Fair Value | 13,136 | 10,921
12 Months or More, Unrealized Losses | 159 | 114
Total, Fair Value | 67,872 | 79,869
Total, Unrealized Losses | 512 | 563
State and Municipals, Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or More, Fair Value | 546 | 544
12 Months or More, Unrealized Losses | 19 | 26
Total, Fair Value | 546 | 544
Total, Unrealized Losses | 19 | 26
State and Municipals, Tax-Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 41,034 | 4,702
Less Than 12 Months, Unrealized Losses | 325 | 23
12 Months or More, Fair Value | 789 | 2,423
12 Months or More, Unrealized Losses | 27 | 39
Total, Fair Value | 41,823 | 7,125
Total, Unrealized Losses | 352 | 62
U.S. Government-Sponsored Enterprises State and Municipals [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 3,006 | 21,228
Less Than 12 Months, Unrealized Losses | 1 | 33
12 Months or More, Fair Value |  | 7,954
12 Months or More, Unrealized Losses |  | 49
Total, Fair Value | 3,006 | 29,182
Total, Unrealized Losses | 1 | 82
Mortgage-Backed Securities, U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 877 | 20,148
Less Than 12 Months, Unrealized Losses | 7 | 167
12 Months or More, Fair Value | 5,119 |
12 Months or More, Unrealized Losses | 24 |
Total, Fair Value | 5,996 | 20,148
Total, Unrealized Losses | 31 | 167
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 9,819 | 22,870
Less Than 12 Months, Unrealized Losses | 20 | 226
12 Months or More, Fair Value | 6,682 |
12 Months or More, Unrealized Losses | 89 |
Total, Fair Value | 16,501 | 22,870
Total, Unrealized Losses | $ 109 | $ 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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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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 Reference 2: 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 + Details
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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 less than twelve months. + 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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