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Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 863,376 | $ 876,796
Unrealized Gains | (23,801) | (21,005)
Unrealized Losses | (3,001) | (6,719)
Securities available-for-sale | 884,176 | 891,082
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 10,570 | 10,670
Unrealized Gains | (198) | (46)
Unrealized Losses | 0 | (23)
Securities available-for-sale | 10,768 | 10,693
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 211,720 | 208,705
Unrealized Gains | (6,210) | (5,089)
Unrealized Losses | (16) | (630)
Securities available-for-sale | 217,914 | 213,164
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 8 | 9
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Securities available-for-sale | 8 | 9
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 422,269 | 441,500
Unrealized Gains | (4,322) | (2,141)
Unrealized Losses | (2,384) | (6,007)
Securities available-for-sale | 424,207 | 437,634
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 209,289 | 206,291
Unrealized Gains | (8,885) | (8,475)
Unrealized Losses | (47) | (59)
Securities available-for-sale | 218,127 | 214,707
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 9,520 | 9,621
Unrealized Gains | (4,186) | (5,254)
Unrealized Losses | (554) | 0
Securities available-for-sale | $ 13,152 | $ 14,875

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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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- 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=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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