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Fair Value Accounting (Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Investment securities available for sale | $ 9,889,850 | $ 10,918,329
Mortgage loans held for sale | 76,864 | 108,198
Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Investment securities available for sale | 631,971 | 779,633
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 753,086 | 939,623
Asset-backed securities |  |
Assets |  |
Investment securities available for sale | 201,366 | 514,188
U.S. Treasury securities |  |
Assets |  |
Investment securities available for sale | 386,584 | 117,838
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 7,242,641 | 8,012,301
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 605,119 | 481,744
Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | 18,188 | 18,801
Level 1 |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 386,584 | 117,838
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 41,254 | 43,657
GGL/SBA loans servicing asset | 0 | 0
Derivative assets | 0 | 0
Liabilities |  |
Trading liability for short positions | 0 | 0
Mutual funds held in rabbi trusts | 25,995 | 27,205
Derivative liabilities | 0 | 0
Level 2 |  |
Assets |  |
Trading securities | 16,277 | 8,391
Investment securities available for sale | 9,503,266 | 10,800,491
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
GGL/SBA loans servicing asset | 0 | 0
Derivative assets | 191,377 | 191,708
Liabilities |  |
Trading liability for short positions | 5,018 | 200
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 339,722 | 95,067
Level 3 |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Other investments | 11,083 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
GGL/SBA loans servicing asset | 3,155 | 3,233
Derivative assets | 0 | 0
Liabilities |  |
Trading liability for short positions | 0 | 0
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 4,993 | 3,535
Fair Value, Measurements, Recurring Basis |  |
Assets |  |
Trading securities | 16,277 | 8,391
Investment securities available for sale | 9,889,850 | 10,918,329
Mortgage loans held for sale | 76,864 | 108,198
Other investments | 11,083 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 41,254 | 43,657
GGL/SBA loans servicing asset | 3,155 | 3,233
Derivative assets | 191,377 | 191,708
Liabilities |  |
Trading liability for short positions | 5,018 | 200
Mutual funds held in rabbi trusts | 25,995 | 27,205
Derivative liabilities | 344,715 | 98,602
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Trading securities | 2,795 | 197
Investment securities available for sale | 631,971 | 779,633
Fair Value, Measurements, Recurring Basis | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 412 | 671
Investment securities available for sale | 753,086 | 939,623
Fair Value, Measurements, Recurring Basis | Other mortgage-backed securities |  |
Assets |  |
Trading securities | 3,231 | 0
Fair Value, Measurements, Recurring Basis | State and municipal securities |  |
Assets |  |
Trading securities | 28 | 560
Fair Value, Measurements, Recurring Basis | Asset-backed securities |  |
Assets |  |
Trading securities | 9,811 | 6,963
Investment securities available for sale | 201,366 | 514,188
Fair Value, Measurements, Recurring Basis | U.S. Treasury securities |  |
Assets |  |
Investment securities available for sale | 386,584 | 117,838
Fair Value, Measurements, Recurring Basis | U.S. Government agency securities |  |
Assets |  |
Investment securities available for sale | 50,895 | 54,201
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 7,242,641 | 8,012,301
Fair Value, Measurements, Recurring Basis | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 605,119 | 481,744
Fair Value, Measurements, Recurring Basis | Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | 18,188 | 18,801
Fair Value, Measurements, Recurring Basis | Level 1 |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 386,584 | 117,838
Mortgage loans held for sale | 0 | 0
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 41,254 | 43,657
GGL/SBA loans servicing asset | 0 | 0
Derivative assets | 0 | 0
Liabilities |  |
Trading liability for short positions | 0 | 0
Mutual funds held in rabbi trusts | 25,995 | 27,205
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | Other mortgage-backed securities |  |
Assets |  |
Trading securities | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | State and municipal securities |  |
Assets |  |
Trading securities | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | Asset-backed securities |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | U.S. Treasury securities |  |
Assets |  |
Investment securities available for sale | 386,584 | 117,838
Fair Value, Measurements, Recurring Basis | Level 1 | U.S. Government agency securities |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 1 | Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 2 |  |
Assets |  |
Trading securities | 16,277 | 8,391
Investment securities available for sale | 9,503,266 | 10,800,491
Mortgage loans held for sale | 76,864 | 108,198
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
GGL/SBA loans servicing asset | 0 | 0
Derivative assets | 191,377 | 191,708
Liabilities |  |
Trading liability for short positions | 5,018 | 200
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 339,722 | 95,067
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Trading securities | 2,795 | 197
Investment securities available for sale | 631,971 | 779,633
Fair Value, Measurements, Recurring Basis | Level 2 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 412 | 671
Investment securities available for sale | 753,086 | 939,623
Fair Value, Measurements, Recurring Basis | Level 2 | Other mortgage-backed securities |  |
Assets |  |
Trading securities | 3,231 | 0
Fair Value, Measurements, Recurring Basis | Level 2 | State and municipal securities |  |
Assets |  |
Trading securities | 28 | 560
Fair Value, Measurements, Recurring Basis | Level 2 | Asset-backed securities |  |
Assets |  |
Trading securities | 9,811 | 6,963
Investment securities available for sale | 201,366 | 514,188
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Treasury securities |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 2 | U.S. Government agency securities |  |
Assets |  |
Investment securities available for sale | 50,895 | 54,201
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 7,242,641 | 8,012,301
Fair Value, Measurements, Recurring Basis | Level 2 | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 605,119 | 481,744
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | 18,188 | 18,801
Fair Value, Measurements, Recurring Basis | Level 3 |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Mortgage loans held for sale | 0 | 0
Other investments | 11,083 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
GGL/SBA loans servicing asset | 3,155 | 3,233
Derivative assets | 0 | 0
Liabilities |  |
Trading liability for short positions | 0 | 0
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 4,993 | 3,535
Fair Value, Measurements, Recurring Basis | Level 3 | Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | Other mortgage-backed securities |  |
Assets |  |
Trading securities | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | State and municipal securities |  |
Assets |  |
Trading securities | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | Asset-backed securities |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | U.S. Treasury securities |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | U.S. Government agency securities |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring Basis | Level 3 | Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | $ 0 | $ 0

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