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Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 866,840 | $ 880,946
Unrealized Gains | (23,311) | (24,296)
Unrealized Losses | (4,315) | (8,189)
Securities available-for-sale | 885,836 | 897,053
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 11,059 | 1,411
Unrealized Gains | (61) | (56)
Unrealized Losses | 0 | 0
Securities available-for-sale | 11,120 | 1,467
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 188,184 | 180,673
Unrealized Gains | (6,391) | (7,593)
Unrealized Losses | (235) | (330)
Securities available-for-sale | 194,340 | 187,936
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 10 | 17
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Securities available-for-sale | 10 | 17
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 453,593 | 489,765
Unrealized Gains | (4,019) | (2,513)
Unrealized Losses | (3,703) | (7,623)
Securities available-for-sale | 453,909 | 484,655
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 204,279 | 198,875
Unrealized Gains | (7,438) | (9,019)
Unrealized Losses | (377) | (219)
Securities available-for-sale | 211,340 | 207,675
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 9,715 | 10,205
Unrealized Gains | (5,402) | (5,115)
Unrealized Losses | 0 | (17)
Securities available-for-sale | $ 15,117 | $ 15,303

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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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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