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Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
investment securities held-to-maturity |  |
Amortized cost | $ 1,819,901 | $ 955,542
Gross Unrealized Gains | 318 | 2,764
Gross Unrealized Losses | (42,155) | (1,123)
Fair Value | 1,778,064 | 957,183
Investment securities available for sale |  |
Amortized cost | 5,221,296 | 3,268,037
Gross Unrealized Gains | 35,980 | 66,800
Gross Unrealized Losses | (63,798) | (4,165)
Fair Value | 5,193,478 | 3,330,672
U.S. Government agencies |  |
investment securities held-to-maturity |  |
Amortized cost | 112,913 | 25,000
Gross Unrealized Gains |  | 1
Gross Unrealized Losses | (2,627) |
Fair Value | 110,286 | 25,001
Investment securities available for sale |  |
Amortized cost | 98,882 | 29,882
Gross Unrealized Gains |  | 16
Gross Unrealized Losses | (1,765) | (642)
Fair Value | 97,117 | 29,256
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
investment securities held-to-maturity |  |
Amortized cost | 1,120,104 | 632,269
Gross Unrealized Gains | 14 | 1,827
Gross Unrealized Losses | (24,278) | (1,032)
Fair Value | 1,095,840 | 633,064
Investment securities available for sale |  |
Amortized cost | 1,851,700 | 1,351,506
Gross Unrealized Gains | 5,324 | 16,657
Gross Unrealized Losses | (25,985) | (1,031)
Fair Value | 1,831,039 | 1,367,132
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
investment securities held-to-maturity |  |
Amortized cost | 174,178 | 75,767
Gross Unrealized Gains |  | 405
Gross Unrealized Losses | (4,937) |
Fair Value | 169,241 | 76,172
Investment securities available for sale |  |
Amortized cost | 730,949 | 739,797
Gross Unrealized Gains | 5,957 | 16,579
Gross Unrealized Losses | (10,911) | (825)
Fair Value | 725,995 | 755,551
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
investment securities held-to-maturity |  |
Amortized cost | 350,116 | 174,506
Gross Unrealized Gains | 304 | 300
Gross Unrealized Losses | (8,021) | (91)
Fair Value | 342,399 | 174,715
Investment securities available for sale |  |
Amortized cost | 1,220,233 | 229,219
Gross Unrealized Gains | 5,438 | 10,939
Gross Unrealized Losses | (18,430) | (50)
Fair Value | 1,207,241 | 240,108
State and municipal obligations |  |
Investment securities available for sale |  |
Amortized cost | 798,211 | 502,575
Gross Unrealized Gains | 16,697 | 17,491
Gross Unrealized Losses | (2,219) | (27)
Fair Value | 812,689 | 520,039
Small Business Administration loan-backed securities |  |
investment securities held-to-maturity |  |
Amortized cost | 62,590 | 48,000
Gross Unrealized Gains |  | 231
Gross Unrealized Losses | (2,292) |
Fair Value | 60,298 | 48,231
Investment securities available for sale |  |
Amortized cost | 502,812 | 401,496
Gross Unrealized Gains | 2,330 | 4,978
Gross Unrealized Losses | (4,479) | (1,590)
Fair Value | 500,663 | 404,884
Corporate securities. |  |
Investment securities available for sale |  |
Amortized cost | 18,509 | 13,562
Gross Unrealized Gains | 234 | 140
Gross Unrealized Losses | (9) |
Fair Value | $ 18,734 | $ 13,702

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