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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 1,655,190 | $ 1,090,363
Gross Unrealized Gains | 27,835 | 43,985
Gross Unrealized Losses | (13,391) | (323)
Fair Value | 1,669,634 | 1,134,025
Held to maturity |  |
Amortized Cost | 769,240 | 168,676
Gross Unrealized Gains | 8,354 | 11,314
Gross Unrealized Losses | (9,495) | 0
Fair Value | 768,099 | 179,990
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost | 119,159 | 19,750
Gross Unrealized Gains | 136 | 0
Gross Unrealized Losses | (707) | (35)
Fair Value | 118,588 | 19,715
State and municipal |  |
Available for sale |  |
Amortized Cost | 1,108,057 | 803,100
Gross Unrealized Gains | 22,276 | 35,014
Gross Unrealized Losses | (11,210) | (271)
Fair Value | 1,119,123 | 837,843
Held to maturity |  |
Amortized Cost | 283,858 | 157,421
Gross Unrealized Gains | 8,170 | 11,035
Gross Unrealized Losses | (2,909) | 0
Fair Value | 289,119 | 168,456
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 73,922 | 144,022
Gross Unrealized Gains | 1,607 | 3,448
Gross Unrealized Losses | (4) | (17)
Fair Value | 75,525 | 147,453
Held to maturity |  |
Amortized Cost | 69,537 | 2,661
Gross Unrealized Gains | 10 | 36
Gross Unrealized Losses | (793) | 0
Fair Value | 68,754 | 2,697
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 236,432 | 114,484
Gross Unrealized Gains | 2,341 | 4,315
Gross Unrealized Losses | (1,068) | 0
Fair Value | 237,705 | 118,799
Held to maturity |  |
Amortized Cost | 215,873 | 8,594
Gross Unrealized Gains | 167 | 243
Gross Unrealized Losses | (3,542) | 0
Fair Value | 212,498 | 8,837
Private labeled mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 32,948 |
Gross Unrealized Gains | 274 |
Gross Unrealized Losses | (285) |
Fair Value | 32,937 | 0
Held to maturity |  |
Amortized Cost | 66,298 | 0
Gross Unrealized Gains | 7 |
Gross Unrealized Losses | (753) |
Fair Value | 65,552 | 0
Corporate notes |  |
Available for sale |  |
Amortized Cost | 84,672 | 9,007
Gross Unrealized Gains | 1,201 | 1,208
Gross Unrealized Losses | (117) | 0
Fair Value | 85,756 | $ 10,215
Held to maturity |  |
Amortized Cost | 133,674 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1,498) |
Fair Value | $ 132,176 |

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