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Securities (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Gain on sale of investments | $ (10) | $ (10) | $ (13) | $ (14) |  |  |  |
Gross unrealized losses | 3,742 |  | 3,742 |  |  | $ 6,719 |  |
Cumulative OTTI charges | 13,974 | $ 13,995 | 13,974 | $ 13,995 | $ 13,995 | 13,995 | $ 13,995 | $ 14,050
Amortized Cost | 853,807 |  | 853,807 |  |  | 876,796 |  |
Securities available-for-sale | $ 876,538 |  | $ 876,538 |  |  | $ 891,082 |  |
Minimum [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Basis point spread on variable rate | 1.60% |  | 1.60% |  |  |  |  |
Minimum [Member] | Standard Poors [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Credit Quality Indicator Pricing | 40.92 |  | 40.92 |  |  |  |  |
Minimum [Member] | Moody Investor Service [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Credit Quality Indicator Pricing | 13.05 |  | 13.05 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Basis point spread on variable rate | 1.80% |  | 1.80% |  |  |  |  |
Maximum [Member] | Standard Poors [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Credit Quality Indicator Pricing | 45.47 |  | 45.47 |  |  |  |  |
Maximum [Member] | Moody Investor Service [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Credit Quality Indicator Pricing | 40.27 |  | 40.27 |  |  |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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