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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Securities available-for-sale [Abstract] |  |  |
Amortized Cost | $ 3,241,683,000 |  | $ 3,491,633,000
Gross Unrealized Gains | 108,924,000 |  | 66,147,000
Gross Unrealized Losses | 40,329,000 |  | 17,785,000
Securities available-for-sale, at fair value | 3,310,278,000 |  | 3,539,995,000
Available-for-sale, Amortized Cost [Abstract] |  |  |
Due in one year or less | 73,636,000 |  |
Due in one year to five years | 9,378,000 |  |
Due in five years to ten years | 173,763,000 |  |
Due after ten years | 1,180,492,000 |  |
Mortgage-backed securities | 1,661,910,000 |  |
Asset-backed securities | 142,504,000 |  |
Amortized Cost | 3,241,683,000 |  |
Available-for-sale, Fair Value [Abstract] |  |  |
Due in one year or less | 73,774,000 |  |
Due in one year to five years | 9,640,000 |  |
Due in five years to ten years | 174,310,000 |  |
Due after ten years | 1,173,693,000 |  |
Mortgage-backed securities | 1,738,446,000 |  |
Asset-backed securities | 140,415,000 |  |
Securities available-for-sale, at fair value | 3,310,278,000 |  | 3,539,995,000
Securities held-to-maturity [Abstract] |  |  |
Amortized Cost | 1,048,223,000 |  | 188,996,000
Allowance for credit losses - securities held-to-maturity | (188,000) | $ (10,000) | 0
HeldToMaturitySecurities, net of allowance for credit losses | 1,048,035,000 |  | 188,996,000
Gross Unrealized Gains | 19,387,000 |  | 12,221,000
Gross Unrealized Losses | 6,377,000 |  | 0
Securities held-to-maturity, fair value | 1,061,233,000 |  | 201,217,000
Held-to-maturity, Amortized Cost [Abstract] |  |  |
Due in one year or less | 0 |  |
Due in one year to five years | 1,000,000 |  |
Due in five years to ten years | 2,905,000 |  |
Due after ten years | 1,044,318,000 |  |
Mortgage-backed securities | 0 |  |
Asset-backed securities | 0 |  |
Amortized Cost | 1,048,223,000 |  | 188,996,000
Held-to-maturity, Fair Value [Abstract] |  |  |
Due in one year or less | 0 |  |
Due in one year to five years | 1,047,000 |  |
Due in five years to ten years | 2,979,000 |  |
Due after ten years | 1,057,207,000 |  |
Mortgage-backed securities | 0 |  |
Asset-backed securities | 0 |  |
Fair Value | 1,061,233,000 |  | 201,217,000
U.S. Treasury securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost | 72,482,000 |  | 72,862,000
Gross Unrealized Gains | 130,000 |  | 19,000
Gross Unrealized Losses | 0 |  | 14,000
Securities available-for-sale, at fair value | 72,612,000 |  | 72,867,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value | 72,612,000 |  | 72,867,000
U.S. government agency securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost | 74,939,000 |  | 80,096,000
Gross Unrealized Gains | 1,404,000 |  | 306,000
Gross Unrealized Losses | 32,000 |  | 710,000
Securities available-for-sale, at fair value | 76,311,000 |  | 79,692,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value | 76,311,000 |  | 79,692,000
Mortgage-backed securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost | 1,661,910,000 |  | 1,458,894,000
Gross Unrealized Gains | 77,923,000 |  | 12,789,000
Gross Unrealized Losses | 1,387,000 |  | 7,776,000
Securities available-for-sale, at fair value | 1,738,446,000 |  | 1,463,907,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value | 1,738,446,000 |  | 1,463,907,000
State and municipal securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost | 1,182,925,000 |  | 1,669,606,000
Gross Unrealized Gains | 28,447,000 |  | 52,096,000
Gross Unrealized Losses | 31,643,000 |  | 7,249,000
Securities available-for-sale, at fair value | 1,179,729,000 |  | 1,714,453,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value | 1,179,729,000 |  | 1,714,453,000
Securities held-to-maturity [Abstract] |  |  |
Amortized Cost | 1,048,223,000 |  | 188,996,000
Gross Unrealized Gains | 19,387,000 |  | 12,221,000
Gross Unrealized Losses | 6,377,000 |  | 0
Securities held-to-maturity, fair value | 1,061,233,000 |  | 201,217,000
Held-to-maturity, Amortized Cost [Abstract] |  |  |
Amortized Cost | 1,048,223,000 |  | 188,996,000
Held-to-maturity, Fair Value [Abstract] |  |  |
Fair Value | 1,061,233,000 |  | 201,217,000
Asset-backed securities |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost | 142,504,000 |  | 153,963,000
Gross Unrealized Gains | 521,000 |  | 302,000
Gross Unrealized Losses | 2,610,000 |  | 1,293,000
Securities available-for-sale, at fair value | 140,415,000 |  | 152,972,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value | 140,415,000 |  | 152,972,000
Corporate notes and other |  |  |
Securities available-for-sale [Abstract] |  |  |
Amortized Cost | 106,923,000 |  | 56,212,000
Gross Unrealized Gains | 499,000 |  | 635,000
Gross Unrealized Losses | 4,657,000 |  | 743,000
Securities available-for-sale, at fair value | 102,765,000 |  | 56,104,000
Available-for-sale, Fair Value [Abstract] |  |  |
Securities available-for-sale, at fair value | $ 102,765,000 |  | $ 56,104,000

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