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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 4,238,366,000 | $ 3,487,296,000
Gross Unrealized Gains | 106,705,000 | 117,222,000
Gross Unrealized Losses | 14,001,000 | 17,837,000
Securities available-for-sale, at fair value | 4,331,070,000 | 3,586,681,000
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 112,691,000 |
Due in one year to five years | 33,685,000 |
Due in five years to ten years | 496,477,000 |
Due after ten years | 1,540,794,000 |
Mortgage-backed securities | 1,854,519,000 |
Asset-backed securities | 200,200,000 |
Amortized Cost | 4,238,366,000 |
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 112,686,000 |
Due in one year to five years | 33,706,000 |
Due in five years to ten years | 508,583,000 |
Due after ten years | 1,576,759,000 |
Mortgage-backed securities | 1,899,248,000 |
Asset-backed securities | 200,088,000 |
Securities available-for-sale, at fair value | 4,331,070,000 | 3,586,681,000
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 996,036,000 | 1,028,550,000
Allowance for credit losses - securities held-to-maturity | (198,000) | (191,000)
HeldToMaturitySecurities, net of allowance for credit losses | 995,838,000 | 1,028,359,000
Gross Unrealized Gains | 35,035,000 | 38,272,000
Gross Unrealized Losses | 432,000 | 291,000
Securities held-to-maturity, fair value | 1,030,639,000 | 1,066,531,000
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 | 6,609,000 |
Due after ten years | 988,018,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Amortized Cost | 996,036,000 | 1,028,550,000
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 1,470,000 |
Due in five years to ten years | 6,704,000 |
Due after ten years | 1,022,465,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Fair Value | 1,030,639,000 | 1,066,531,000
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 111,475,000 | 82,199,000
Gross Unrealized Gains | 5,000 | 10,000
Gross Unrealized Losses | 11,000 | 0
Securities available-for-sale, at fair value | 111,469,000 | 82,209,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 111,469,000 | 82,209,000
U.S. government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 421,833,000 | 74,916,000
Gross Unrealized Gains | 3,214,000 | 1,547,000
Gross Unrealized Losses | 2,191,000 | 60,000
Securities available-for-sale, at fair value | 422,856,000 | 76,403,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 422,856,000 | 76,403,000
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,854,519,000 | 1,623,759,000
Gross Unrealized Gains | 50,747,000 | 67,759,000
Gross Unrealized Losses | 6,018,000 | 2,327,000
Securities available-for-sale, at fair value | 1,899,248,000 | 1,689,191,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,899,248,000 | 1,689,191,000
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,535,461,000 | 1,411,288,000
Gross Unrealized Gains | 48,999,000 | 44,559,000
Gross Unrealized Losses | 3,747,000 | 12,484,000
Securities available-for-sale, at fair value | 1,580,713,000 | 1,443,363,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,580,713,000 | 1,443,363,000
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 996,036,000 | 1,028,550,000
Gross Unrealized Gains | 35,035,000 | 38,272,000
Gross Unrealized Losses | 432,000 | 291,000
Securities held-to-maturity, fair value | 1,030,639,000 | 1,066,531,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 996,036,000 | 1,028,550,000
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 1,030,639,000 | 1,066,531,000
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 200,200,000 | 177,878,000
Gross Unrealized Gains | 318,000 | 715,000
Gross Unrealized Losses | 430,000 | 657,000
Securities available-for-sale, at fair value | 200,088,000 | 177,936,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 200,088,000 | 177,936,000
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 114,878,000 | 117,256,000
Gross Unrealized Gains | 3,422,000 | 2,632,000
Gross Unrealized Losses | 1,604,000 | 2,309,000
Securities available-for-sale, at fair value | 116,696,000 | 117,579,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | $ 116,696,000 | $ 117,579,000

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