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Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 889,786 | $ 880,946
Unrealized Gains | (20,667) | (24,296)
Unrealized Losses | (8,903) | (8,189)
Fair Value | 901,550 | 897,053
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 1,298 | 1,411
Unrealized Gains | (61) | (56)
Unrealized Losses | 0 | 0
Fair Value | 1,359 | 1,467
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 183,601 | 180,673
Unrealized Gains | (6,060) | (7,593)
Unrealized Losses | (914) | (330)
Fair Value | 188,747 | 187,936
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 13 | 17
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 13 | 17
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 489,361 | 489,765
Unrealized Gains | (2,548) | (2,513)
Unrealized Losses | (7,114) | (7,623)
Fair Value | 484,795 | 484,655
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 205,649 | 198,875
Unrealized Gains | (6,994) | (9,019)
Unrealized Losses | (873) | (219)
Fair Value | 211,770 | 207,675
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 9,864 | 10,205
Unrealized Gains | (5,004) | (5,115)
Unrealized Losses | (2) | (17)
Fair Value | $ 14,866 | $ 15,303

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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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