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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 880,136 | $ 822,089
Gross Unrealized Gains | 24,645 | 15,961
Gross Unrealized Losses | (4,305) | (3,274)
Fair Value | 900,476 | 834,776
Held to maturity |  |
Amortized Cost | 199,467 | 207,899
Gross Unrealized Gains | 7,974 | 7,336
Gross Unrealized Losses | (117) | (88)
Fair Value | 207,324 | 215,147
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost |  | 1,415
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (2)
Fair Value |  | 1,413
State and municipal |  |
Available for sale |  |
Amortized Cost | 460,013 | 396,931
Gross Unrealized Gains | 15,311 | 11,288
Gross Unrealized Losses | (4,121) | (2,451)
Fair Value | 471,203 | 405,768
Held to maturity |  |
Amortized Cost | 183,478 | 190,767
Gross Unrealized Gains | 7,496 | 7,129
Gross Unrealized Losses | (117) | (54)
Fair Value | 190,857 | 197,842
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 253,977 | 267,272
Gross Unrealized Gains | 4,020 | 2,543
Gross Unrealized Losses | (184) | (563)
Fair Value | 257,813 | 269,252
Held to maturity |  |
Amortized Cost | 3,693 | 4,560
Gross Unrealized Gains | 53 | 13
Gross Unrealized Losses | 0 | (5)
Fair Value | 3,746 | 4,568
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 155,289 | 145,623
Gross Unrealized Gains | 4,761 | 1,207
Gross Unrealized Losses | 0 | (258)
Fair Value | 160,050 | 146,572
Held to maturity |  |
Amortized Cost | 12,296 | 12,572
Gross Unrealized Gains | 425 | 194
Gross Unrealized Losses | 0 | (29)
Fair Value | 12,721 | 12,737
Corporate notes |  |
Available for sale |  |
Amortized Cost | 10,857 | 10,848
Gross Unrealized Gains | 553 | 923
Gross Unrealized Losses | 0 | 0
Fair Value | $ 11,410 | $ 11,771

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