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Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 895,703 | $ 907,575
Unrealized Gains | (36,784) | (20,976)
Unrealized Losses | (446) | (1,834)
Securities available-for-sale | 932,041 | 926,717
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 98,780 | 102,490
Unrealized Gains | (2,762) | (1,293)
Unrealized Losses | (38) | (150)
Securities available-for-sale | 101,504 | 103,633
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 235,774 | 240,753
Unrealized Gains | (9,082) | (2,979)
Unrealized Losses | 0 | (350)
Securities available-for-sale | 244,856 | 243,382
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 21,891 |
Unrealized Gains | (798) |
Unrealized Losses | 0 |
Securities available-for-sale | 22,689 | 22,104
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 276,125 | 280,797
Unrealized Gains | (8,461) | (1,735)
Unrealized Losses | (220) | (1,221)
Securities available-for-sale | 284,366 | 281,311
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 259,907 | 253,277
Unrealized Gains | (12,410) | (11,265)
Unrealized Losses | (188) | (108)
Securities available-for-sale | 272,129 | 264,434
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 0 | 0
Unrealized Gains | (3,233) | (3,619)
Unrealized Losses | 0 | 0
Securities available-for-sale | $ 3,233 | $ 3,619

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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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