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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | $ 1,214,313 |  | $ 955,542
Gross Unrealized Gains | 44 |  | 2,764
Gross Unrealized Losses | (33,595) |  | (1,123)
Fair Value | 1,180,762 |  | 957,183
Investment securities available for sale |  |  |
Amortized cost | 3,892,645 |  | 3,268,037
Gross Unrealized Gains | 44,490 |  | 66,800
Gross Unrealized Losses | (45,645) |  | (4,165)
Fair Value | 3,891,490 |  | 3,330,672
Net realized gain (loss) | 0 | $ 0 |
U.S. Government agencies |  |  |
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 49,988 |  | 25,000
Gross Unrealized Gains |  |  | 1
Gross Unrealized Losses | (1,919) |  |
Fair Value | 48,069 |  | 25,001
Investment securities available for sale |  |  |
Amortized cost | 25,000 |  | 29,882
Gross Unrealized Gains |  |  | 16
Gross Unrealized Losses | (1,447) |  | (642)
Fair Value | 23,553 |  | 29,256
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |  |
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 749,291 |  | 632,269
Gross Unrealized Gains |  |  | 1,827
Gross Unrealized Losses | (19,340) |  | (1,032)
Fair Value | 729,951 |  | 633,064
Investment securities available for sale |  |  |
Amortized cost | 1,560,744 |  | 1,351,506
Gross Unrealized Gains | 9,607 |  | 16,657
Gross Unrealized Losses | (21,669) |  | (1,031)
Fair Value | 1,548,682 |  | 1,367,132
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |  |
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 99,326 |  | 75,767
Gross Unrealized Gains |  |  | 405
Gross Unrealized Losses | (4,627) |  |
Fair Value | 94,699 |  | 76,172
Investment securities available for sale |  |  |
Amortized cost | 682,412 |  | 739,797
Gross Unrealized Gains | 14,441 |  | 16,579
Gross Unrealized Losses | (6,303) |  | (825)
Fair Value | 690,550 |  | 755,551
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |  |
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 250,708 |  | 174,506
Gross Unrealized Gains | 44 |  | 300
Gross Unrealized Losses | (5,878) |  | (91)
Fair Value | 244,874 |  | 174,715
Investment securities available for sale |  |  |
Amortized cost | 581,776 |  | 229,219
Gross Unrealized Gains | 7,021 |  | 10,939
Gross Unrealized Losses | (8,418) |  | (50)
Fair Value | 580,379 |  | 240,108
State and municipal obligations |  |  |
Investment securities available for sale |  |  |
Amortized cost | 589,954 |  | 502,575
Gross Unrealized Gains | 10,510 |  | 17,491
Gross Unrealized Losses | (4,361) |  | (27)
Fair Value | 596,103 |  | 520,039
Small Business Administration loan-backed securities |  |  |
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 65,000 |  | 48,000
Gross Unrealized Gains |  |  | 231
Gross Unrealized Losses | (1,831) |  |
Fair Value | 63,169 |  | 48,231
Investment securities available for sale |  |  |
Amortized cost | 439,210 |  | 401,496
Gross Unrealized Gains | 2,741 |  | 4,978
Gross Unrealized Losses | (3,414) |  | (1,590)
Fair Value | 438,537 |  | 404,884
Corporate securities. |  |  |
Investment securities available for sale |  |  |
Amortized cost | 13,549 |  | 13,562
Gross Unrealized Gains | 170 |  | 140
Gross Unrealized Losses | (33) |  |
Fair Value | $ 13,686 |  | $ 13,702

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