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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 4,579,141,000 | $ 3,487,296,000
Gross Unrealized Gains | 84,879,000 | 117,222,000
Gross Unrealized Losses | 29,367,000 | 17,837,000
Fair Value | 4,634,653,000 | 3,586,681,000
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 106,128,000 |
Due in one year to five years | 56,921,000 |
Due in five years to ten years | 508,208,000 |
Due after ten years | 1,748,950,000 |
Mortgage-backed securities | 1,938,218,000 |
Asset-backed securities | 220,716,000 |
Amortized Cost | 4,579,141,000 | 3,487,296,000
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 106,120,000 |
Due in one year to five years | 56,821,000 |
Due in five years to ten years | 517,678,000 |
Due after ten years | 1,765,856,000 |
Mortgage-backed securities | 1,967,981,000 |
Asset-backed securities | 220,197,000 |
Fair Value | 4,634,653,000 | 3,586,681,000
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 989,398,000 | 1,028,550,000
Gross Unrealized Gains | 25,817,000 | 38,272,000
Gross Unrealized Losses | 808,000 | 291,000
Fair Value | 1,014,407,000 | 1,066,531,000
Allowance for credit losses - securities held-to-maturity | (161,000) | (191,000)
HeldToMaturitySecurities, net of allowance for credit losses | 989,237,000 | 1,028,359,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 1,409,000 |
Due in five years to ten years | 5,676,000 |
Due after ten years | 982,313,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Amortized Cost | 989,398,000 | 1,028,550,000
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 1,472,000 |
Due in five years to ten years | 5,734,000 |
Due after ten years | 1,007,201,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Fair Value | 1,014,407,000 | 1,066,531,000
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 144,387,000 | 82,199,000
Gross Unrealized Gains | 0 | 10,000
Gross Unrealized Losses | 230,000 | 0
Fair Value | 144,157,000 | 82,209,000
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 144,387,000 | 82,199,000
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 144,157,000 | 82,209,000
U.S. government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 423,481,000 | 74,916,000
Gross Unrealized Gains | 1,566,000 | 1,547,000
Gross Unrealized Losses | 2,992,000 | 60,000
Fair Value | 422,055,000 | 76,403,000
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 423,481,000 | 74,916,000
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 422,055,000 | 76,403,000
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,938,218,000 | 1,623,759,000
Gross Unrealized Gains | 41,663,000 | 67,759,000
Gross Unrealized Losses | 11,900,000 | 2,327,000
Fair Value | 1,967,981,000 | 1,689,191,000
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,938,218,000 | 1,623,759,000
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,967,981,000 | 1,689,191,000
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,733,063,000 | 1,411,288,000
Gross Unrealized Gains | 38,130,000 | 44,559,000
Gross Unrealized Losses | 11,545,000 | 12,484,000
Fair Value | 1,759,648,000 | 1,443,363,000
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,733,063,000 | 1,411,288,000
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,759,648,000 | 1,443,363,000
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 989,398,000 | 1,028,550,000
Gross Unrealized Gains | 25,817,000 | 38,272,000
Gross Unrealized Losses | 808,000 | 291,000
Fair Value | 1,014,407,000 | 1,066,531,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 989,398,000 | 1,028,550,000
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 1,014,407,000 | 1,066,531,000
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 220,716,000 | 177,878,000
Gross Unrealized Gains | 214,000 | 715,000
Gross Unrealized Losses | 733,000 | 657,000
Fair Value | 220,197,000 | 177,936,000
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 220,716,000 | 177,878,000
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 220,197,000 | 177,936,000
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 119,276,000 | 117,256,000
Gross Unrealized Gains | 3,306,000 | 2,632,000
Gross Unrealized Losses | 1,967,000 | 2,309,000
Fair Value | 120,615,000 | 117,579,000
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 119,276,000 | 117,256,000
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | $ 120,615,000 | $ 117,579,000

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