Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 541,305	$ 3,085,441
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	122,957	26,531
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,209,058	3,058,910
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,617	9,624
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	0	2,046
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	122,957	26,531
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,810	1,661
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | Total investment securities AFS
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	122,957	26,531
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | GNMA
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	67,780	235,537
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Private-label
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	329,724	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FFELP
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	177,325	327,189
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,994	3,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Total investment securities AFS
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,209,058	3,058,910
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Residential loans held for sale
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	136,638	129,158
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Interest rate-related instruments(a)
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	83,626	192,518
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	26,231	25,680
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards(a)
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	5,490	4,909
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	5,441	4,836
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commodity contracts(a)
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	1,264	12,486
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	1,248	11,155
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Interest rate lock commitments to originate residential mortgage loans held for sale
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,617	9,624
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Forward commitments to sell residential mortgage loans
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	30	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Forward commitments to sell residential mortgage loans
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	0	2,046
FNMA / FHLMC | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,691,879	1,461,241
FNMA / FHLMC | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	350,623	22,904
GNMA | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	166,799	524,756
U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	122,957	26,531
Agency securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	14,897	25,038
Agency securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	14,897	25,038
Obligations of state and political subdivisions (municipal securities)
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	400,457	450,662
Obligations of state and political subdivisions (municipal securities) | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	400,457	450,662
SBA
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	6,580	8,584
SBA | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 6,580	$ 8,584