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Fair Value Accounting - Financial Instruments Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Total investment securities available for sale | $ 9,678,103 | $ 10,918,329
Mutual funds and mutual funds held in rabbi trusts | 42,659 | 43,657
Derivative assets | 89,815 | 191,708
U.S. Treasury securities |  |
Assets |  |
Total investment securities available for sale | 471,813 | 117,838
Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Total investment securities available for sale | 792,749 | 779,633
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Total investment securities available for sale | 6,895,070 | 8,012,301
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Total investment securities available for sale | 655,127 | 939,623
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Total investment securities available for sale | 805,945 | 481,744
Asset-backed securities |  |
Assets |  |
Total investment securities available for sale |  | 514,188
Corporate debt securities and other debt securities |  |
Assets |  |
Total investment securities available for sale | 8,601 | 18,801
Fair Value, Measurements, Recurring |  |
Assets |  |
Total trading securities | 8,295 | 8,391
Total investment securities available for sale | 9,678,103 | 10,918,329
Mortgage loans held for sale | 51,136 | 108,198
Other investments | 11,172 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 42,659 | 43,657
SBA loans servicing asset | 2,354 | 3,233
Derivative assets | 89,815 | 191,708
Liabilities |  |
Securities sold short | 3,370 | 200
Mutual fund held in rabbi trusts | 27,944 | 27,205
Derivative liabilities | 342,680 | 98,602
Fair Value, Measurements, Recurring | Level 1 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 471,813 | 117,838
Mortgage loans held for sale | 0 | 0
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 42,659 | 43,657
SBA loans servicing asset | 0 | 0
Derivative assets | 0 | 0
Liabilities |  |
Securities sold short | 3,370 | 0
Mutual fund held in rabbi trusts | 27,944 | 27,205
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Total trading securities | 8,295 | 8,391
Total investment securities available for sale | 9,206,290 | 10,800,491
Mortgage loans held for sale | 51,136 | 108,198
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
SBA loans servicing asset | 0 | 0
Derivative assets | 89,815 | 191,708
Liabilities |  |
Securities sold short | 0 | 200
Mutual fund held in rabbi trusts | 0 | 0
Derivative liabilities | 339,227 | 95,067
Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 0 | 0
Mortgage loans held for sale | 0 | 0
Other investments | 11,172 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
SBA loans servicing asset | 2,354 | 3,233
Derivative assets | 0 | 0
Liabilities |  |
Securities sold short | 0 | 0
Mutual fund held in rabbi trusts | 0 | 0
Derivative liabilities | 3,453 | 3,535
Fair Value, Measurements, Recurring | U.S. Treasury securities |  |
Assets |  |
Total investment securities available for sale | 471,813 | 117,838
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 1 |  |
Assets |  |
Total investment securities available for sale | 471,813 | 117,838
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 2 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 3 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. Government agency securities |  |
Assets |  |
Total investment securities available for sale | 48,798 | 54,201
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 1 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 2 |  |
Assets |  |
Total investment securities available for sale | 48,798 | 54,201
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 3 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Total trading securities | 0 | 197
Total investment securities available for sale | 792,749 | 779,633
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 1 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 2 |  |
Assets |  |
Total trading securities | 0 | 197
Total investment securities available for sale | 792,749 | 779,633
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 3 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Total investment securities available for sale | 6,895,070 | 8,012,301
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 1 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 2 |  |
Assets |  |
Total investment securities available for sale | 6,895,070 | 8,012,301
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 3 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Total trading securities | 2,991 | 671
Total investment securities available for sale | 655,127 | 939,623
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 1 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 2 |  |
Assets |  |
Total trading securities | 2,991 | 671
Total investment securities available for sale | 655,127 | 939,623
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 3 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Other mortgage-backed securities |  |
Assets |  |
Total trading securities | 3,185 | 0
Fair Value, Measurements, Recurring | Other mortgage-backed securities | Level 1 |  |
Assets |  |
Total trading securities | 0 | 0
Fair Value, Measurements, Recurring | Other mortgage-backed securities | Level 2 |  |
Assets |  |
Total trading securities | 3,185 | 0
Fair Value, Measurements, Recurring | Other mortgage-backed securities | Level 3 |  |
Assets |  |
Total trading securities | 0 | 0
Fair Value, Measurements, Recurring | State and municipal securities |  |
Assets |  |
Total trading securities | 48 | 560
Fair Value, Measurements, Recurring | State and municipal securities | Level 1 |  |
Assets |  |
Total trading securities | 0 | 0
Fair Value, Measurements, Recurring | State and municipal securities | Level 2 |  |
Assets |  |
Total trading securities | 48 | 560
Fair Value, Measurements, Recurring | State and municipal securities | Level 3 |  |
Assets |  |
Total trading securities | 0 | 0
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Total investment securities available for sale | 805,945 | 481,744
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 1 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 2 |  |
Assets |  |
Total investment securities available for sale | 805,945 | 481,744
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 3 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Asset-backed securities |  |
Assets |  |
Total trading securities | 2,071 | 6,963
Total investment securities available for sale | 0 | 514,188
Fair Value, Measurements, Recurring | Asset-backed securities | Level 1 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2 |  |
Assets |  |
Total trading securities | 2,071 | 6,963
Total investment securities available for sale | 0 | 514,188
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3 |  |
Assets |  |
Total trading securities | 0 | 0
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities |  |
Assets |  |
Total investment securities available for sale | 8,601 | 18,801
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 1 |  |
Assets |  |
Total investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 2 |  |
Assets |  |
Total investment securities available for sale | 8,601 | 18,801
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 3 |  |
Assets |  |
Total investment securities available for sale | $ 0 | $ 0

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