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Securities (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Gain on sale of investments | $ (9) | $ 0 | $ (23) | $ 1 |  |  |  |
Gross unrealized losses | 4,315 |  | 4,315 |  |  | $ 8,189 |  |
Cumulative OTTI charges | 13,995 | $ 14,050 | 13,995 | $ 14,050 | $ 13,995 | 14,050 | $ 14,079 | $ 14,079
Amortized Cost | 866,840 |  | 866,840 |  |  | 880,946 |  |
Securities available-for-sale | $ 885,836 |  | $ 885,836 |  |  | $ 897,053 |  |
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 | 44.9 |  | 44.9 |  |  |  |  |
Minimum [Member] | Moody Investor Service [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Credit Quality Indicator Pricing | 7.2 |  | 7.2 |  |  |  |  |
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 | 63.8 |  | 63.8 |  |  |  |  |
Maximum [Member] | Moody Investor Service [Member] |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Credit Quality Indicator Pricing | 16.3 |  | 16.3 |  |  |  |  |

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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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + Details
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