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Securities Securities - Available for sale (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 3,491,633 | $ 3,146,023
Gross Unrealized Gain | 66,147 | 5,275
Gross Unrealized Loss | 17,785 | 67,612
Securities available-for-sale, at fair value | 3,539,995 | 3,083,686
Available-for-sale, Amortized Cost |  |
Due in one year of less | 72,914 |
Due in one year to five years | 12,879 |
Due in five to ten years | 103,099 |
Due after ten years | 1,689,884 |
Mortgage-backed securities | 1,458,894 |
Asset-backed securities | 153,963 |
Amortized Cost | 3,491,633 |
Available-for-sale, Fair Value |  |
Due in one year or less | 72,916 |
Due in one year to five years | 13,083 |
Due in five years to ten years | 103,584 |
Due after ten years | 1,733,533 |
Mortgage-backed securities | 1,463,907 |
Asset-backed securities | 152,972 |
Securities available-for-sale, at fair value | 3,539,995 | 3,083,686
State and Municipal Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,669,606 | 1,259,267
Gross Unrealized Gain | 52,096 | 1,126
Gross Unrealized Loss | 7,249 | 30,739
Securities available-for-sale, at fair value | 1,714,453 | 1,229,654
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,714,453 | 1,229,654
U.S. Government Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 80,096 | 71,456
Gross Unrealized Gain | 306 | 49
Gross Unrealized Loss | 710 | 1,346
Securities available-for-sale, at fair value | 79,692 | 70,159
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 79,692 | 70,159
Mortgage-backed Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,458,894 | 1,336,469
Gross Unrealized Gain | 12,789 | 3,110
Gross Unrealized Loss | 7,776 | 28,634
Securities available-for-sale, at fair value | 1,463,907 | 1,310,945
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,463,907 | 1,310,945
US Treasury Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 72,862 | 30,325
Gross Unrealized Gain | 19 | 0
Gross Unrealized Loss | 14 | 25
Securities available-for-sale, at fair value | 72,867 | 30,300
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 72,867 | 30,300
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 153,963 | 379,107
Gross Unrealized Gain | 302 | 820
Gross Unrealized Loss | 1,293 | 4,345
Securities available-for-sale, at fair value | 152,972 | 375,582
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 152,972 | 375,582
Corporate Notes |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 56,212 | 69,399
Gross Unrealized Gain | 635 | 170
Gross Unrealized Loss | 743 | 2,523
Securities available-for-sale, at fair value | 56,104 | 67,046
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | $ 56,104 | $ 67,046

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- Definition Represents amount of available-for-sale debt securities at cost, net of adjustment of asset-backed securities. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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