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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 3,620,716,000 | $ 3,487,296,000
Gross Unrealized Gains | 85,513,000 | 117,222,000
Gross Unrealized Losses | 29,210,000 | 17,837,000
Securities available-for-sale, at fair value | 3,677,019,000 | 3,586,681,000
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 88,478,000 |
Due in one year to five years | 13,022,000 |
Due in five years to ten years | 265,259,000 |
Due after ten years | 1,479,282,000 |
Mortgage-backed securities | 1,583,670,000 |
Asset-backed securities | 191,005,000 |
Amortized Cost | 3,620,716,000 |
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 88,502,000 |
Due in one year to five years | 13,266,000 |
Due in five years to ten years | 278,713,000 |
Due after ten years | 1,496,065,000 |
Mortgage-backed securities | 1,609,778,000 |
Asset-backed securities | 190,695,000 |
Securities available-for-sale, at fair value | 3,677,019,000 | 3,586,681,000
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 1,014,543,000 | 1,028,550,000
Allowance for credit losses - securities held-to-maturity | (198,000) | (191,000)
HeldToMaturitySecurities, net of allowance for credit losses | 1,014,345,000 | 1,028,359,000
Gross Unrealized Gains | 22,320,000 | 38,272,000
Gross Unrealized Losses | 3,114,000 | 291,000
Securities held-to-maturity, fair value | 1,033,749,000 | 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 | 7,152,000 |
Due after ten years | 1,005,982,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Amortized Cost | 1,014,543,000 | 1,028,550,000
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due in one year to five years | 1,476,000 |
Due in five years to ten years | 7,223,000 |
Due after ten years | 1,025,050,000 |
Mortgage-backed securities | 0 |
Asset-backed securities | 0 |
Fair Value | 1,033,749,000 | 1,066,531,000
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 83,971,000 | 82,199,000
Gross Unrealized Gains | 22,000 | 10,000
Gross Unrealized Losses | 0 | 0
Securities available-for-sale, at fair value | 83,993,000 | 82,209,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 83,993,000 | 82,209,000
U.S. government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 159,613,000 | 74,916,000
Gross Unrealized Gains | 1,224,000 | 1,547,000
Gross Unrealized Losses | 3,381,000 | 60,000
Securities available-for-sale, at fair value | 157,456,000 | 76,403,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 157,456,000 | 76,403,000
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,583,670,000 | 1,623,759,000
Gross Unrealized Gains | 40,921,000 | 67,759,000
Gross Unrealized Losses | 14,813,000 | 2,327,000
Securities available-for-sale, at fair value | 1,609,778,000 | 1,689,191,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,609,778,000 | 1,689,191,000
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,480,691,000 | 1,411,288,000
Gross Unrealized Gains | 40,140,000 | 44,559,000
Gross Unrealized Losses | 8,471,000 | 12,484,000
Securities available-for-sale, at fair value | 1,512,360,000 | 1,443,363,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 1,512,360,000 | 1,443,363,000
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 1,014,543,000 | 1,028,550,000
Gross Unrealized Gains | 22,320,000 | 38,272,000
Gross Unrealized Losses | 3,114,000 | 291,000
Securities held-to-maturity, fair value | 1,033,749,000 | 1,066,531,000
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 1,014,543,000 | 1,028,550,000
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 1,033,749,000 | 1,066,531,000
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 191,005,000 | 177,878,000
Gross Unrealized Gains | 382,000 | 715,000
Gross Unrealized Losses | 692,000 | 657,000
Securities available-for-sale, at fair value | 190,695,000 | 177,936,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | 190,695,000 | 177,936,000
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 121,766,000 | 117,256,000
Gross Unrealized Gains | 2,824,000 | 2,632,000
Gross Unrealized Losses | 1,853,000 | 2,309,000
Securities available-for-sale, at fair value | 122,737,000 | 117,579,000
Available-for-sale, Fair Value [Abstract] |  |
Securities available-for-sale, at fair value | $ 122,737,000 | $ 117,579,000

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