Fair Value Accounting (Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Investment securities available for sale	$ 10,481,071	$ 7,962,438
Mortgage loans held for sale	152,258	216,647
Mortgage-backed securities issued by U.S. Government agencies
Assets
Investment securities available for sale	872,217	1,218,017
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Assets
Investment securities available for sale	1,057,488	1,250,377
Asset-backed securities
Assets
Investment securities available for sale	650,000
U.S. Treasury securities
Assets
Investment securities available for sale	117,893	20,257
Mortgage-backed securities issued by U.S. Government sponsored enterprises
Assets
Investment securities available for sale	7,270,933	5,000,046
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Assets
Investment securities available for sale	438,523	370,921
Corporate debt securities and other debt securities
Assets
Investment securities available for sale	19,028	20,500
Level 1
Assets
Trading securities	0	0
Investment securities available for sale	117,893	20,257
Private equity investments	0	0
Other investments	0
Mutual funds and mutual funds held in rabbi trusts	42,002	37,650
GGL/SBA loans servicing asset	0	0
Derivative assets	0	0
Liabilities
Trading liability for short positions		0
Mutual funds held in rabbi trusts	25,396	20,752
Earnout liability		0
Derivative liabilities	0	0
Level 2
Assets
Trading securities	6,876	10,880
Investment securities available for sale	10,363,178	7,940,160
Private equity investments	0	0
Other investments	0
Mutual funds and mutual funds held in rabbi trusts	0	0
GGL/SBA loans servicing asset	0	0
Derivative assets	244,991	401,295
Liabilities
Trading liability for short positions		7,717
Mutual funds held in rabbi trusts	0	0
Earnout liability		0
Derivative liabilities	109,320	155,119
Level 3
Assets
Trading securities	0	0
Investment securities available for sale	0	2,021
Private equity investments	991	1,021
Other investments	10,000
Mutual funds and mutual funds held in rabbi trusts	0	0
GGL/SBA loans servicing asset	3,388	3,258
Derivative assets	0	0
Liabilities
Trading liability for short positions		0
Mutual funds held in rabbi trusts	0	0
Earnout liability		5,677
Derivative liabilities	1,171	2,048
Fair Value, Measurements, Recurring Basis
Assets
Trading securities	6,876	10,880
Investment securities available for sale	10,481,071	7,962,438
Mortgage loans held for sale	152,258	216,647
Private equity investments	991	1,021
Other investments	10,000	0
Mutual funds and mutual funds held in rabbi trusts	42,002	37,650
GGL/SBA loans servicing asset	3,388	3,258
Derivative assets	244,991	401,295
Liabilities
Trading liability for short positions	0	7,717
Mutual funds held in rabbi trusts	25,396	20,752
Earnout liability	0	5,677
Derivative liabilities	110,491	157,167
Fair Value, Measurements, Recurring Basis \| Mortgage-backed securities issued by U.S. Government agencies
Assets
Trading securities	0	10,185
Investment securities available for sale	872,217	1,218,017
Fair Value, Measurements, Recurring Basis \| Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Assets
Trading securities	1,660	158
Investment securities available for sale	1,057,488	1,250,377
Fair Value, Measurements, Recurring Basis \| Other mortgage-backed securities
Assets
Trading securities	94	178
Fair Value, Measurements, Recurring Basis \| State and municipal securities
Assets
Trading securities	1,007	176
Fair Value, Measurements, Recurring Basis \| Asset-backed securities
Assets
Trading securities	4,115	183
Investment securities available for sale	650,000	0
Fair Value, Measurements, Recurring Basis \| U.S. Treasury securities
Assets
Investment securities available for sale	117,893	20,257
Fair Value, Measurements, Recurring Basis \| U.S. Government agency securities
Assets
Investment securities available for sale	54,989	82,320
Fair Value, Measurements, Recurring Basis \| Mortgage-backed securities issued by U.S. Government sponsored enterprises
Assets
Investment securities available for sale	7,270,933	5,000,046
Fair Value, Measurements, Recurring Basis \| Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises
Assets
Investment securities available for sale	438,523	370,921
Fair Value, Measurements, Recurring Basis \| Corporate debt securities and other debt securities
Assets
Investment securities available for sale	19,028	20,500
Fair Value, Measurements, Recurring Basis \| Level 1
Assets
Trading securities	0	0
Investment securities available for sale	117,893	20,257
Mortgage loans held for sale	0	0
Private equity investments	0	0
Other investments	0	0
Mutual funds and mutual funds held in rabbi trusts	42,002	37,650
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	25,396	20,752
Earnout liability	0	0
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	117,893	20,257
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	6,876	10,880
Investment securities available for sale	10,363,178	7,940,160
Mortgage loans held for sale	152,258	216,647
Private equity investments	0	0
Other investments	0	0
Mutual funds and mutual funds held in rabbi trusts	0	0
GGL/SBA loans servicing asset	0	0
Derivative assets	244,991	401,295
Liabilities
Trading liability for short positions	0	7,717
Mutual funds held in rabbi trusts	0	0
Earnout liability	0	0
Derivative liabilities	109,320	155,119
Fair Value, Measurements, Recurring Basis \| Level 2 \| Mortgage-backed securities issued by U.S. Government agencies
Assets
Trading securities	0	10,185
Investment securities available for sale	872,217	1,218,017
Fair Value, Measurements, Recurring Basis \| Level 2 \| Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Assets
Trading securities	1,660	158
Investment securities available for sale	1,057,488	1,250,377
Fair Value, Measurements, Recurring Basis \| Level 2 \| Other mortgage-backed securities
Assets
Trading securities	94	178
Fair Value, Measurements, Recurring Basis \| Level 2 \| State and municipal securities
Assets
Trading securities	1,007	176
Fair Value, Measurements, Recurring Basis \| Level 2 \| Asset-backed securities
Assets
Trading securities	4,115	183
Investment securities available for sale	650,000	0
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	54,989	82,320
Fair Value, Measurements, Recurring Basis \| Level 2 \| Mortgage-backed securities issued by U.S. Government sponsored enterprises
Assets
Investment securities available for sale	7,270,933	5,000,046
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	438,523	370,921
Fair Value, Measurements, Recurring Basis \| Level 2 \| Corporate debt securities and other debt securities
Assets
Investment securities available for sale	19,028	18,479
Fair Value, Measurements, Recurring Basis \| Level 3
Assets
Trading securities	0	0
Investment securities available for sale	0	2,021
Mortgage loans held for sale	0	0
Private equity investments	991	1,021
Other investments	10,000	0
Mutual funds and mutual funds held in rabbi trusts	0	0
GGL/SBA loans servicing asset	3,388	3,258
Derivative assets	0	0
Liabilities
Trading liability for short positions	0	0
Mutual funds held in rabbi trusts	0	0
Earnout liability	0	5,677
Derivative liabilities	1,171	2,048
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	$ 2,021

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Mutual Funds and Mutual Funds Held In Rabbi Trusts In Assets

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Private Equity Investments

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of mortgage loans held-for-sale.

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Amount of investments classified as other.

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Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities.

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