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v3.23.2

Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Investment securities held-to-maturity |  |  |  |  |
Amortized cost |  |  | $ 2,585,155,000 |  | $ 2,683,241,000
Gross Unrealized Losses |  |  | (440,641,000) |  | (433,073,000)
Fair Value |  |  | 2,144,514,000 |  | 2,250,168,000
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 5,830,576,000 |  | 6,216,141,000
Gross Unrealized Gains |  |  | 160,000 |  | 4,054,000
Gross Unrealized Losses |  |  | (881,402,000) |  | (893,373,000)
Fair Value |  |  | 4,949,334,000 |  | 5,326,822,000
Gross realized gains |  |  | 1,300,000 |  |
Gross realized losses |  |  | 1,300,000 |  |
Securities gains, net | $ 0 |  | 45,000 | $ 0 |
Atlantic Capital |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Realized gains or losses |  | $ 0 |  |  |
Sold securities |  | $ 414,400,000 |  |  |
U.S. Treasuries |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 223,658,000 |  | 272,416,000
Gross Unrealized Losses |  |  | (3,745,000) |  | (6,778,000)
Fair Value |  |  | 219,913,000 |  | 265,638,000
U.S. Government agencies |  |  |  |  |
Investment securities held-to-maturity |  |  |  |  |
Amortized cost |  |  | 197,265,000 |  | 197,262,000
Gross Unrealized Losses |  |  | (29,352,000) |  | (29,787,000)
Fair Value |  |  | 167,913,000 |  | 167,475,000
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 246,030,000 |  | 245,972,000
Gross Unrealized Losses |  |  | (27,685,000) |  | (26,884,000)
Fair Value |  |  | 218,345,000 |  | 219,088,000
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |  |  |  |
Investment securities held-to-maturity |  |  |  |  |
Amortized cost |  |  | 1,514,472,000 |  | 1,591,646,000
Gross Unrealized Losses |  |  | (253,666,000) |  | (255,093,000)
Fair Value |  |  | 1,260,806,000 |  | 1,336,553,000
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 1,903,472,000 |  | 1,996,405,000
Gross Unrealized Losses |  |  | (299,102,000) |  | (298,052,000)
Fair Value |  |  | 1,604,370,000 |  | 1,698,353,000
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |  |  |  |
Investment securities held-to-maturity |  |  |  |  |
Amortized cost |  |  | 460,574,000 |  | 474,660,000
Gross Unrealized Losses |  |  | (72,157,000) |  | (69,664,000)
Fair Value |  |  | 388,417,000 |  | 404,996,000
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 666,198,000 |  | 708,337,000
Gross Unrealized Losses |  |  | (106,422,000) |  | (107,292,000)
Fair Value |  |  | 559,776,000 |  | 601,045,000
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |  |  |  |
Investment securities held-to-maturity |  |  |  |  |
Amortized cost |  |  | 357,815,000 |  | 362,586,000
Gross Unrealized Losses |  |  | (73,410,000) |  | (66,304,000)
Fair Value |  |  | 284,405,000 |  | 296,282,000
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 1,173,907,000 |  | 1,196,700,000
Gross Unrealized Gains |  |  |  |  | 2,542,000
Gross Unrealized Losses |  |  | (211,413,000) |  | (198,844,000)
Fair Value |  |  | 962,494,000 |  | 1,000,398,000
State and municipal obligations |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 1,135,189,000 |  | 1,269,525,000
Gross Unrealized Gains |  |  | 3,000 |  | 1,210,000
Gross Unrealized Losses |  |  | (180,737,000) |  | (205,883,000)
Fair Value |  |  | 954,455,000 |  | 1,064,852,000
Small Business Administration loan-backed securities |  |  |  |  |
Investment securities held-to-maturity |  |  |  |  |
Amortized cost |  |  | 55,029,000 |  | 57,087,000
Gross Unrealized Losses |  |  | (12,056,000) |  | (12,225,000)
Fair Value |  |  | 42,973,000 |  | 44,862,000
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 451,564,000 |  | 491,203,000
Gross Unrealized Gains |  |  | 157,000 |  | 302,000
Gross Unrealized Losses |  |  | (47,162,000) |  | (46,695,000)
Fair Value |  |  | 404,559,000 |  | 444,810,000
Corporate securities. |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost |  |  | 30,558,000 |  | 35,583,000
Gross Unrealized Losses |  |  | (5,136,000) |  | (2,945,000)
Fair Value |  |  | $ 25,422,000 |  | $ 32,638,000

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