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Fair Value Accounting (Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Investment securities available for sale | $ 10,463,101 | $ 10,918,329
Mortgage loans held for sale | 111,992 | 108,198
Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Investment securities available for sale | 686,744 | 779,633
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 822,878 | 939,623
Asset-backed securities |  |
Assets |  |
Investment securities available for sale | 337,037 | 514,188
U.S. Treasury securities |  |
Assets |  |
Investment securities available for sale | 394,586 | 117,838
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 7,620,631 | 8,012,301
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 530,796 | 481,744
Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | 18,624 | 18,801
Level 1 |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 394,586 | 117,838
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 43,842 | 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 | 28,095 | 27,205
Derivative liabilities | 0 | 0
Level 2 |  |
Assets |  |
Trading securities | 9,618 | 8,391
Investment securities available for sale | 10,068,515 | 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 | 160,545 | 191,708
Liabilities |  |
Trading liability for short positions | 389 | 200
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 230,087 | 95,067
Level 3 |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 0 | 0
Other investments | 12,093 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
GGL/SBA loans servicing asset | 3,451 | 3,233
Derivative assets | 0 | 0
Liabilities |  |
Trading liability for short positions | 0 | 0
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 1,776 | 3,535
Fair Value, Measurements, Recurring Basis |  |
Assets |  |
Trading securities | 9,618 | 8,391
Investment securities available for sale | 10,463,101 | 10,918,329
Mortgage loans held for sale | 111,992 | 108,198
Other investments | 12,093 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 43,842 | 43,657
GGL/SBA loans servicing asset | 3,451 | 3,233
Derivative assets | 160,545 | 191,708
Liabilities |  |
Trading liability for short positions | 389 | 200
Mutual funds held in rabbi trusts | 28,095 | 27,205
Derivative liabilities | 231,863 | 98,602
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Trading securities | 0 | 197
Investment securities available for sale | 686,744 | 779,633
Fair Value, Measurements, Recurring Basis | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 483 | 671
Investment securities available for sale | 822,878 | 939,623
Fair Value, Measurements, Recurring Basis | Other mortgage-backed securities |  |
Assets |  |
Trading securities | 3,362 | 0
Fair Value, Measurements, Recurring Basis | State and municipal securities |  |
Assets |  |
Trading securities | 414 | 560
Fair Value, Measurements, Recurring Basis | Asset-backed securities |  |
Assets |  |
Trading securities | 5,359 | 6,963
Investment securities available for sale | 337,037 | 514,188
Fair Value, Measurements, Recurring Basis | U.S. Treasury securities |  |
Assets |  |
Investment securities available for sale | 394,586 | 117,838
Fair Value, Measurements, Recurring Basis | U.S. Government agency securities |  |
Assets |  |
Investment securities available for sale | 51,805 | 54,201
Fair Value, Measurements, Recurring Basis | Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Assets |  |
Investment securities available for sale | 7,620,631 | 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 | 530,796 | 481,744
Fair Value, Measurements, Recurring Basis | Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | 18,624 | 18,801
Fair Value, Measurements, Recurring Basis | Level 1 |  |
Assets |  |
Trading securities | 0 | 0
Investment securities available for sale | 394,586 | 117,838
Mortgage loans held for sale | 0 | 0
Other investments | 0 | 0
Mutual funds and mutual funds held in rabbi trusts | 43,842 | 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 | 28,095 | 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 | 394,586 | 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 | 9,618 | 8,391
Investment securities available for sale | 10,068,515 | 10,800,491
Mortgage loans held for sale | 111,992 | 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 | 160,545 | 191,708
Liabilities |  |
Trading liability for short positions | 389 | 200
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 230,087 | 95,067
Fair Value, Measurements, Recurring Basis | Level 2 | Mortgage-backed securities issued by U.S. Government agencies |  |
Assets |  |
Trading securities | 0 | 197
Investment securities available for sale | 686,744 | 779,633
Fair Value, Measurements, Recurring Basis | Level 2 | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 483 | 671
Investment securities available for sale | 822,878 | 939,623
Fair Value, Measurements, Recurring Basis | Level 2 | Other mortgage-backed securities |  |
Assets |  |
Trading securities | 3,362 | 0
Fair Value, Measurements, Recurring Basis | Level 2 | State and municipal securities |  |
Assets |  |
Trading securities | 414 | 560
Fair Value, Measurements, Recurring Basis | Level 2 | Asset-backed securities |  |
Assets |  |
Trading securities | 5,359 | 6,963
Investment securities available for sale | 337,037 | 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 | 51,805 | 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 | 7,620,631 | 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 | 530,796 | 481,744
Fair Value, Measurements, Recurring Basis | Level 2 | Corporate debt securities and other debt securities |  |
Assets |  |
Investment securities available for sale | 18,624 | 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 | 12,093 | 12,185
Mutual funds and mutual funds held in rabbi trusts | 0 | 0
GGL/SBA loans servicing asset | 3,451 | 3,233
Derivative assets | 0 | 0
Liabilities |  |
Trading liability for short positions | 0 | 0
Mutual funds held in rabbi trusts | 0 | 0
Derivative liabilities | 1,776 | 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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