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Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 918,591 | $ 793,084
Unrealized Gains | (22,684) | (7,046)
Unrealized Losses | (1,331) | (15,214)
Securities available-for-sale | 939,944 | 784,916
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 105,115 | 25,617
Unrealized Gains | (2,205) | (218)
Unrealized Losses | (44) | (471)
Securities available-for-sale | 107,276 | 25,364
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 214,486 | 182,050
Unrealized Gains | (2,558) | (723)
Unrealized Losses | (308) | (4,030)
Securities available-for-sale | 216,736 | 178,743
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 24,193 |
Unrealized Gains | (231) |
Unrealized Losses | 0 |
Securities available-for-sale | 24,424 | 0
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 306,699 | 352,823
Unrealized Gains | (2,243) | (217)
Unrealized Losses | (904) | (9,424)
Securities available-for-sale | 308,038 | 343,616
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 257,889 | 232,457
Unrealized Gains | (11,842) | (2,767)
Unrealized Losses | (75) | (1,289)
Securities available-for-sale | 269,656 | 233,935
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 7 | 137
Unrealized Gains | (3,597) | (3,121)
Unrealized Losses | 0 | 0
Securities available-for-sale | $ 3,604 | $ 3,258

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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