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Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 1,242,760 | $ 977,830
Unrealized Gains | 35,201 | 43,354
Unrealized Losses | (7,141) | (440)
Fair Value | 1,270,820 | 1,020,744
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 115,492 | 92,710
Unrealized Gains | 3,965 | 5,105
Unrealized Losses | (366) | (1)
Fair Value | 119,091 | 97,814
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 574,048 | 346,606
Unrealized Gains | 6,056 | 8,794
Unrealized Losses | (5,165) | (279)
Fair Value | 574,939 | 355,121
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 15,591 | 17,931
Unrealized Gains | 336 | 559
Unrealized Losses | 0 | 0
Fair Value | 15,927 | 18,490
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 160,643 | 209,556
Unrealized Gains | 2,397 | 4,761
Unrealized Losses | (772) | (157)
Fair Value | 162,268 | 214,160
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 345,263 | 285,837
Unrealized Gains | 18,664 | 20,294
Unrealized Losses | (770) | 0
Fair Value | 363,157 | 306,131
Taxable Municipal Bonds |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 31,067 | 22,440
Unrealized Gains | 539 | 702
Unrealized Losses | (68) | (3)
Fair Value | 31,538 | 23,139
US Treasury Securities |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 656 | 2,750
Unrealized Gains | 0 | 3
Unrealized Losses | 0 | 0
Fair Value | 656 | 2,753
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 0 | 0
Unrealized Gains | 3,244 | 3,136
Unrealized Losses | 0 | 0
Fair Value | $ 3,244 | $ 3,136

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