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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 1,243,312 | $ 1,090,363
Gross Unrealized Gains | 29,139 | 43,985
Gross Unrealized Losses | (10,276) | (323)
Fair Value | 1,262,175 | 1,134,025
Held to maturity |  |
Amortized Cost | 161,650 | 168,676
Gross Unrealized Gains | 9,302 | 11,314
Gross Unrealized Losses | (3) | 0
Fair Value | 170,949 | 179,990
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost | 40,155 | 19,750
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (553) | (35)
Fair Value | 39,602 | 19,715
State and municipal |  |
Available for sale |  |
Amortized Cost | 992,461 | 803,100
Gross Unrealized Gains | 22,182 | 35,014
Gross Unrealized Losses | (9,592) | (271)
Fair Value | 1,005,051 | 837,843
Held to maturity |  |
Amortized Cost | 151,474 | 157,421
Gross Unrealized Gains | 9,109 | 11,035
Gross Unrealized Losses | 0 | 0
Fair Value | 160,583 | 168,456
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 116,072 | 144,022
Gross Unrealized Gains | 3,019 | 3,448
Gross Unrealized Losses | (3) | (17)
Fair Value | 119,088 | 147,453
Held to maturity |  |
Amortized Cost | 1,959 | 2,661
Gross Unrealized Gains | 22 | 36
Gross Unrealized Losses | (2) | 0
Fair Value | 1,979 | 2,697
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 84,609 | 114,484
Gross Unrealized Gains | 2,866 | 4,315
Gross Unrealized Losses | (124) | 0
Fair Value | 87,351 | 118,799
Held to maturity |  |
Amortized Cost | 8,217 | 8,594
Gross Unrealized Gains | 171 | 243
Gross Unrealized Losses | (1) | 0
Fair Value | 8,387 | 8,837
Corporate notes |  |
Available for sale |  |
Amortized Cost | 10,015 | 9,007
Gross Unrealized Gains | 1,072 | 1,208
Gross Unrealized Losses | (4) | 0
Fair Value | $ 11,083 | $ 10,215

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