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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 976,813 | $ 822,089
Gross Unrealized Gains | 39,317 | 15,961
Gross Unrealized Losses | (787) | (3,274)
Fair Value | 1,015,343 | 834,776
Held to maturity |  |
Amortized Cost | 180,270 | 207,899
Gross Unrealized Gains | 11,342 | 7,336
Gross Unrealized Losses | 0 | (88)
Fair Value | 191,612 | 215,147
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost | 6,250 | 1,415
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (11) | (2)
Fair Value | 6,239 | 1,413
State and municipal |  |
Available for sale |  |
Amortized Cost | 651,256 | 396,931
Gross Unrealized Gains | 27,978 | 11,288
Gross Unrealized Losses | (775) | (2,451)
Fair Value | 678,459 | 405,768
Held to maturity |  |
Amortized Cost | 165,858 | 190,767
Gross Unrealized Gains | 10,919 | 7,129
Gross Unrealized Losses | 0 | (54)
Fair Value | 176,777 | 197,842
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 180,628 | 267,272
Gross Unrealized Gains | 5,222 | 2,543
Gross Unrealized Losses | (1) | (563)
Fair Value | 185,849 | 269,252
Held to maturity |  |
Amortized Cost | 2,839 | 4,560
Gross Unrealized Gains | 67 | 13
Gross Unrealized Losses | 0 | (5)
Fair Value | 2,906 | 4,568
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 127,802 | 145,623
Gross Unrealized Gains | 4,670 | 1,207
Gross Unrealized Losses | 0 | (258)
Fair Value | 132,472 | 146,572
Held to maturity |  |
Amortized Cost | 11,573 | 12,572
Gross Unrealized Gains | 356 | 194
Gross Unrealized Losses | 0 | (29)
Fair Value | 11,929 | 12,737
Corporate notes |  |
Available for sale |  |
Amortized Cost | 10,877 | 10,848
Gross Unrealized Gains | 1,447 | 923
Gross Unrealized Losses | 0 | 0
Fair Value | $ 12,324 | $ 11,771

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