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Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 803,271 | $ 811,369
Unrealized Gains | (5,834) | (13,097)
Unrealized Losses | (23,412) | (9,535)
Securities available-for-sale | 785,693 | 814,931
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 13,042 | 13,989
Unrealized Gains | (2) | (24)
Unrealized Losses | (571) | (318)
Securities available-for-sale | 12,473 | 13,695
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 189,999 | 215,079
Unrealized Gains | (798) | (2,071)
Unrealized Losses | (6,146) | (1,812)
Securities available-for-sale | 184,651 | 215,338
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost |  | 1
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Securities available-for-sale |  | 1
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 368,486 | 346,005
Unrealized Gains | (26) | (370)
Unrealized Losses | (13,965) | (6,705)
Securities available-for-sale | 354,547 | 339,670
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 231,565 | 227,651
Unrealized Gains | (1,764) | (4,671)
Unrealized Losses | (2,730) | (700)
Securities available-for-sale | 230,599 | 231,622
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 179 | 8,644
Unrealized Gains | (3,244) | (5,961)
Unrealized Losses | 0 | 0
Securities available-for-sale | $ 3,423 | $ 14,605

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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=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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