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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
investment securities held-to-maturity |  |  |  |  |
Investment Securities - Held to Maturity | $ 1,189,265,000 |  | $ 1,189,265,000 |  | $ 955,542,000
Gross Unrealized Gains | 56,000 |  | 56,000 |  | 2,764,000
Gross Unrealized Losses | (20,929,000) |  | (20,929,000) |  | (1,123,000)
Fair Value | 1,168,392,000 |  | 1,168,392,000 |  | 957,183,000
Investment securities available for sale |  |  |  |  |
Amortized cost | 4,337,295,000 |  | 4,337,295,000 |  | 3,268,037,000
Gross Unrealized Gains | 57,822,000 |  | 57,822,000 |  | 66,800,000
Gross Unrealized Losses | (25,958,000) |  | (25,958,000) |  | (4,165,000)
Fair Value | 4,369,159,000 |  | 4,369,159,000 |  | 3,330,672,000
Gross realized gains | 69,000 |  |  |  |
Gross realized losses |  |  | 33,000 |  |
Net realized gain (loss) |  | $ 0 | 36,000 | $ 0 |
U.S. Government agencies |  |  |  |  |
investment securities held-to-maturity |  |  |  |  |
Investment Securities - Held to Maturity | 49,988,000 |  | 49,988,000 |  | 25,000,000
Gross Unrealized Gains |  |  |  |  | 1,000
Gross Unrealized Losses | (937,000) |  | (937,000) |  |
Fair Value | 49,051,000 |  | 49,051,000 |  | 25,001,000
Investment securities available for sale |  |  |  |  |
Amortized cost | 49,300,000 |  | 49,300,000 |  | 29,882,000
Gross Unrealized Gains |  |  |  |  | 16,000
Gross Unrealized Losses | (1,163,000) |  | (1,163,000) |  | (642,000)
Fair Value | 48,137,000 |  | 48,137,000 |  | 29,256,000
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |  |  |  |
investment securities held-to-maturity |  |  |  |  |
Investment Securities - Held to Maturity | 728,027,000 |  | 728,027,000 |  | 632,269,000
Gross Unrealized Gains |  |  |  |  | 1,827,000
Gross Unrealized Losses | (13,263,000) |  | (13,263,000) |  | (1,032,000)
Fair Value | 714,764,000 |  | 714,764,000 |  | 633,064,000
Investment securities available for sale |  |  |  |  |
Amortized cost | 1,669,659,000 |  | 1,669,659,000 |  | 1,351,506,000
Gross Unrealized Gains | 9,990,000 |  | 9,990,000 |  | 16,657,000
Gross Unrealized Losses | (13,522,000) |  | (13,522,000) |  | (1,031,000)
Fair Value | 1,666,127,000 |  | 1,666,127,000 |  | 1,367,132,000
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |  |  |  |
investment securities held-to-maturity |  |  |  |  |
Investment Securities - Held to Maturity | 97,164,000 |  | 97,164,000 |  | 75,767,000
Gross Unrealized Gains |  |  |  |  | 405,000
Gross Unrealized Losses | (2,457,000) |  | (2,457,000) |  |
Fair Value | 94,707,000 |  | 94,707,000 |  | 76,172,000
Investment securities available for sale |  |  |  |  |
Amortized cost | 657,315,000 |  | 657,315,000 |  | 739,797,000
Gross Unrealized Gains | 13,218,000 |  | 13,218,000 |  | 16,579,000
Gross Unrealized Losses | (3,756,000) |  | (3,756,000) |  | (825,000)
Fair Value | 666,777,000 |  | 666,777,000 |  | 755,551,000
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |  |  |  |
investment securities held-to-maturity |  |  |  |  |
Investment Securities - Held to Maturity | 249,933,000 |  | 249,933,000 |  | 174,506,000
Gross Unrealized Gains | 56,000 |  | 56,000 |  | 300,000
Gross Unrealized Losses | (3,950,000) |  | (3,950,000) |  | (91,000)
Fair Value | 246,039,000 |  | 246,039,000 |  | 174,715,000
Investment securities available for sale |  |  |  |  |
Amortized cost | 805,707,000 |  | 805,707,000 |  | 229,219,000
Gross Unrealized Gains | 11,476,000 |  | 11,476,000 |  | 10,939,000
Gross Unrealized Losses | (4,570,000) |  | (4,570,000) |  | (50,000)
Fair Value | 812,613,000 |  | 812,613,000 |  | 240,108,000
State and municipal obligations |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost | 677,226,000 |  | 677,226,000 |  | 502,575,000
Gross Unrealized Gains | 17,289,000 |  | 17,289,000 |  | 17,491,000
Gross Unrealized Losses | (1,387,000) |  | (1,387,000) |  | (27,000)
Fair Value | 693,128,000 |  | 693,128,000 |  | 520,039,000
Small Business Administration loan-backed securities |  |  |  |  |
investment securities held-to-maturity |  |  |  |  |
Investment Securities - Held to Maturity | 64,153,000 |  | 64,153,000 |  | 48,000,000
Gross Unrealized Gains |  |  |  |  | 231,000
Gross Unrealized Losses | (322,000) |  | (322,000) |  |
Fair Value | 63,831,000 |  | 63,831,000 |  | 48,231,000
Investment securities available for sale |  |  |  |  |
Amortized cost | 464,553,000 |  | 464,553,000 |  | 401,496,000
Gross Unrealized Gains | 5,492,000 |  | 5,492,000 |  | 4,978,000
Gross Unrealized Losses | (1,560,000) |  | (1,560,000) |  | (1,590,000)
Fair Value | 468,485,000 |  | 468,485,000 |  | 404,884,000
Corporate securities. |  |  |  |  |
Investment securities available for sale |  |  |  |  |
Amortized cost | 13,535,000 |  | 13,535,000 |  | 13,562,000
Gross Unrealized Gains | 357,000 |  | 357,000 |  | 140,000
Fair Value | $ 13,892,000 |  | $ 13,892,000 |  | $ 13,702,000

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