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Securities Securities - Available for sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 3,487,296 | $ 3,491,633
Gross Unrealized Gain | 117,222 | 66,147
Gross Unrealized Loss | 17,837 | 17,785
Securities available-for-sale, at fair value | 3,586,681 | 3,539,995
Available-for-sale, Amortized Cost |  |
Due in one year of less | 83,050 |
Due in one year to five years | 12,406 |
Due in five to ten years | 188,991 |
Due after ten years | 1,401,212 |
Mortgage-backed securities | 1,623,759 |
Asset-backed securities | 177,878 |
Amortized Cost | 3,487,296 |
Available-for-sale, Fair Value |  |
Due in one year or less | 83,066 |
Due in one year to five years | 12,802 |
Due in five years to ten years | 198,687 |
Due after ten years | 1,424,999 |
Mortgage-backed securities | 1,689,191 |
Asset-backed securities | 177,936 |
Securities available-for-sale, at fair value | 3,586,681 | 3,539,995
State and Municipal Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,411,288 | 1,669,606
Gross Unrealized Gain | 44,559 | 52,096
Gross Unrealized Loss | 12,484 | 7,249
Securities available-for-sale, at fair value | 1,443,363 | 1,714,453
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,443,363 | 1,714,453
U.S. Government Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 74,916 | 80,096
Gross Unrealized Gain | 1,547 | 306
Gross Unrealized Loss | 60 | 710
Securities available-for-sale, at fair value | 76,403 | 79,692
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 76,403 | 79,692
Mortgage-backed Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,623,759 | 1,458,894
Gross Unrealized Gain | 67,759 | 12,789
Gross Unrealized Loss | 2,327 | 7,776
Securities available-for-sale, at fair value | 1,689,191 | 1,463,907
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,689,191 | 1,463,907
US Treasury Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 82,199 | 72,862
Gross Unrealized Gain | 10 | 19
Gross Unrealized Loss | 0 | 14
Securities available-for-sale, at fair value | 82,209 | 72,867
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 82,209 | 72,867
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 177,878 | 153,963
Gross Unrealized Gain | 715 | 302
Gross Unrealized Loss | 657 | 1,293
Securities available-for-sale, at fair value | 177,936 | 152,972
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 177,936 | 152,972
Corporate Notes |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 117,256 | 56,212
Gross Unrealized Gain | 2,632 | 635
Gross Unrealized Loss | 2,309 | 743
Securities available-for-sale, at fair value | 117,579 | 56,104
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | $ 117,579 | $ 56,104

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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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