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Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 840,352 | $ 855,521
Unrealized Gains | (16,225) | (12,618)
Unrealized Losses | (5,000) | (14,414)
Securities available-for-sale | 851,577 | 853,725
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 14,898 | 13,594
Unrealized Gains | (50) | (32)
Unrealized Losses | (141) | (377)
Securities available-for-sale | 14,807 | 13,249
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 239,368 | 261,878
Unrealized Gains | (4,011) | (3,200)
Unrealized Losses | (819) | (4,073)
Securities available-for-sale | 242,560 | 261,005
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 2 | 4
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Securities available-for-sale | 2 | 4
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 353,334 | 353,499
Unrealized Gains | (1,811) | (1,021)
Unrealized Losses | (3,596) | (6,344)
Securities available-for-sale | 351,549 | 348,176
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 223,797 | 217,365
Unrealized Gains | (7,023) | (3,954)
Unrealized Losses | (444) | (2,396)
Securities available-for-sale | 230,376 | 218,923
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 8,953 | 9,181
Unrealized Gains | (3,330) | (4,411)
Unrealized Losses | 0 | (1,224)
Securities available-for-sale | $ 12,283 | $ 12,368

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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=75030427&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=82897076&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=82896770&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=82897076&loc=d3e27161-111563 + Details
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