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Securities Securities - Available for sale (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 4,858,544 | $ 3,487,296
Gross Unrealized Gain | 88,336 | 117,222
Gross Unrealized Loss | 32,686 | 17,837
Securities available-for-sale, at fair value | 4,914,194 | 3,586,681
Available-for-sale, Amortized Cost |  |
Due in one year of less | 103,578 |
Due in one year to five years | 320,844 |
Due in five to ten years | 507,968 |
Due after ten years | 1,785,185 |
Mortgage-backed securities | 1,908,675 |
Asset-backed securities | 232,294 |
Amortized Cost | 4,858,544 | 3,487,296
Available-for-sale, Fair Value |  |
Due in one year or less | 103,533 |
Due in one year to five years | 321,710 |
Due in five years to ten years | 513,643 |
Due after ten years | 1,825,500 |
Mortgage-backed securities | 1,920,239 |
Asset-backed securities | 229,569 |
Securities available-for-sale, at fair value | 4,914,194 | 3,586,681
US Treasury Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 194,490 | 82,199
Gross Unrealized Gain | 0 | 10
Gross Unrealized Loss | 881 | 0
Securities available-for-sale, at fair value | 193,609 | 82,209
Available-for-sale, Amortized Cost |  |
Amortized Cost | 194,490 | 82,199
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 193,609 | 82,209
U.S. Government Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 634,611 | 74,916
Gross Unrealized Gain | 2,359 | 1,547
Gross Unrealized Loss | 4,961 | 60
Securities available-for-sale, at fair value | 632,009 | 76,403
Available-for-sale, Amortized Cost |  |
Amortized Cost | 634,611 | 74,916
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 632,009 | 76,403
Mortgage-backed Agency Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,908,675 | 1,623,759
Gross Unrealized Gain | 29,874 | 67,759
Gross Unrealized Loss | 18,310 | 2,327
Securities available-for-sale, at fair value | 1,920,239 | 1,689,191
Available-for-sale, Amortized Cost |  |
Amortized Cost | 1,908,675 | 1,623,759
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,920,239 | 1,689,191
State and Municipal Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,774,119 | 1,411,288
Gross Unrealized Gain | 52,961 | 44,559
Gross Unrealized Loss | 3,243 | 12,484
Securities available-for-sale, at fair value | 1,823,837 | 1,443,363
Available-for-sale, Amortized Cost |  |
Amortized Cost | 1,774,119 | 1,411,288
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 1,823,837 | 1,443,363
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 232,294 | 177,878
Gross Unrealized Gain | 60 | 715
Gross Unrealized Loss | 2,785 | 657
Securities available-for-sale, at fair value | 229,569 | 177,936
Available-for-sale, Amortized Cost |  |
Amortized Cost | 232,294 | 177,878
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | 229,569 | 177,936
Corporate Notes |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 114,355 | 117,256
Gross Unrealized Gain | 3,082 | 2,632
Gross Unrealized Loss | 2,506 | 2,309
Securities available-for-sale, at fair value | 114,931 | 117,579
Available-for-sale, Amortized Cost |  |
Amortized Cost | 114,355 | 117,256
Available-for-sale, Fair Value |  |
Securities available-for-sale, at fair value | $ 114,931 | $ 117,579

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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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