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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 1,662,254 | $ 1,090,363
Gross Unrealized Gains | 34,968 | 43,985
Gross Unrealized Losses | (6,036) | (323)
Fair Value | 1,691,186 | 1,134,025
Held to maturity |  |
Amortized Cost | 153,284 | 168,676
Gross Unrealized Gains | 9,367 | 11,314
Gross Unrealized Losses | 0 | 0
Fair Value | 162,651 | 179,990
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost | 191,490 | 19,750
Gross Unrealized Gains | 228 | 0
Gross Unrealized Losses | (617) | (35)
Fair Value | 191,101 | 19,715
State and municipal |  |
Available for sale |  |
Amortized Cost | 1,090,693 | 803,100
Gross Unrealized Gains | 27,993 | 35,014
Gross Unrealized Losses | (5,193) | (271)
Fair Value | 1,113,493 | 837,843
Held to maturity |  |
Amortized Cost | 144,430 | 157,421
Gross Unrealized Gains | 9,176 | 11,035
Gross Unrealized Losses | 0 | 0
Fair Value | 153,606 | 168,456
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 96,344 | 144,022
Gross Unrealized Gains | 2,280 | 3,448
Gross Unrealized Losses | (2) | (17)
Fair Value | 98,622 | 147,453
Held to maturity |  |
Amortized Cost | 1,007 | 2,661
Gross Unrealized Gains | 16 | 36
Gross Unrealized Losses | 0 | 0
Fair Value | 1,023 | 2,697
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 165,016 | 114,484
Gross Unrealized Gains | 2,641 | 4,315
Gross Unrealized Losses | (147) | 0
Fair Value | 167,510 | 118,799
Held to maturity |  |
Amortized Cost | 3,733 | 8,594
Gross Unrealized Gains | 175 | 243
Gross Unrealized Losses | 0 | 0
Fair Value | 3,908 | 8,837
Private labeled mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 33,074 |
Gross Unrealized Gains | 508 |
Gross Unrealized Losses | (14) |
Fair Value | 33,568 | 0
Held to maturity |  |
Amortized Cost | 4,114 | 0
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 4,114 | 0
Corporate notes |  |
Available for sale |  |
Amortized Cost | 85,637 | 9,007
Gross Unrealized Gains | 1,318 | 1,208
Gross Unrealized Losses | (63) | 0
Fair Value | $ 86,892 | $ 10,215

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