Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 2,487,312	$ 4,332,015
Equity securities with readily determinable fair values, Fair Value	6,000	5,000
Servicing Asset at Fair Value, Amount	78,352	57,158
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	108,284	122,957
Equity securities with readily determinable fair values, Fair Value	5,655	4,810
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,379,028	4,209,058
Fair Value, Inputs, Level 2 | Designated as Hedging Instrument
Liabilities, Fair Value Disclosure [Abstract]
Interest Rate Fair Value Hedge Liability at Fair Value	906	0
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	3,000	30
Servicing Asset at Fair Value, Amount	78,352	57,259
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	403	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	3,492	30
US Treasury Securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	108,284	122,957
US Treasury Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	108,284	122,957
Agency Securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	13,399	14,897
Agency Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	13,399	14,897
US States and Political Subdivisions Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	340,898	400,457
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	340,898	400,457
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	329,724
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	329,724
Residential Related Securities | FNMA/FHLMC
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	1,656,061	2,691,879
Residential Related Securities | FNMA/FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	1,656,061	2,691,879
Residential Related Securities | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	78,029	67,780
Residential Related Securities | Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	78,029	67,780
Commercial mortgage-related securities | FNMA/FHLMC
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,286	350,623
Commercial mortgage-related securities | FNMA/FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,286	350,623
Commercial mortgage-related securities | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,094	166,799
Commercial mortgage-related securities | Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,094	166,799
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	158,556	177,325
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	158,556	177,325
US Government-sponsored Enterprises Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,772	6,580
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,772	6,580
Other Debt securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,933	2,994
Other Debt securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,933	2,994
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	108,284	122,957
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,379,028	4,209,058
Other Debt And Other Equity Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Equity securities with readily determinable fair values, Fair Value	5,655	4,810
Residential loans held for sale | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Trading assets	51,134	136,638
Interest rate-related and other instruments — customer and mirror, net | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Designated as Hedging Instrument
Assets, Fair Value Disclosure [Abstract]
Trading assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	906	0
Interest rate-related and other instruments — customer and mirror, net | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Not designated as hedging instruments
Assets, Fair Value Disclosure [Abstract]
Trading assets	59,618	83,626
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	264,212	26,231
Foreign currency exchange forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	9,524	5,441
Foreign currency exchange forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Not designated as hedging instruments
Assets, Fair Value Disclosure [Abstract]
Trading assets	10,109	5,490
Commodity contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	1,248
Commodity contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Not designated as hedging instruments
Assets, Fair Value Disclosure [Abstract]
Trading assets	0	1,264
Mortgage banking(a)(b) | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	0	2,617
Mortgage banking(a)(b) | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	0	2,617
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	403	0
Mortgage banking(a)(b) | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Not designated as hedging instruments
Assets, Fair Value Disclosure [Abstract]
Trading assets	$ 3,492	$ 2,647