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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities Available for Sale: |  |
Amortized Cost | $ 825,235 | $ 372,231
Gross Unrealized Gains | 4,640 | 8,997
Gross Unrealized Losses | (9,250) | (414)
Fair Value | 820,625 | 380,814
U.S. treasury securities |  |
Securities Available for Sale: |  |
Amortized Cost | 43,034 | 245
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (652) | 0
Fair Value | 42,382 | 245
U.S. agency |  |
Securities Available for Sale: |  |
Amortized Cost | 18,172 | 1,000
Gross Unrealized Gains | 82 | 4
Gross Unrealized Losses | (165) | 0
Fair Value | 18,089 | 1,004
State, county & municipal securities |  |
Securities Available for Sale: |  |
Amortized Cost | 199,074 | 61,298
Gross Unrealized Gains | 486 | 1,155
Gross Unrealized Losses | (3,520) | (65)
Fair Value | 196,040 | 62,388
Corporate debt securities |  |
Securities Available for Sale: |  |
Amortized Cost | 39,448 | 4,250
Gross Unrealized Gains | 120 | 1
Gross Unrealized Losses | (163) | (1)
Fair Value | 39,405 | 4,250
Mortgage-backed securities |  |
Securities Available for Sale: |  |
Amortized Cost | 525,507 | 305,438
Gross Unrealized Gains | 3,952 | 7,837
Gross Unrealized Losses | (4,750) | (348)
Fair Value | $ 524,709 | $ 312,927

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