Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets [Abstract]
Cash and Due from Banks	$ 521,167	$ 544,059
Interest-Bearing Deposits in Banks and Other Financial Institutions	738,938	453,590
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	0	21,955
Debt Securities, Available-for-Sale	5,036,508	4,581,434
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	3,672,101	3,738,687
Equity Securities, FV-NI and without Readily Determinable Fair Value	25,912	23,242
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	278,356	179,665
Loans and Leases Receivable, Net of Deferred Income	30,607,605	29,768,586
Loans and Leases Receivable, Allowance	(376,515)	(363,545)
Loans and Leases Receivable, Net Amount	30,231,091	29,405,041
Other Short-Term Investments	247,111	258,886
Property, Plant and Equipment, Net	377,372	379,093
Life Insurance, Corporate or Bank Owned, Amount	691,470	689,000
Goodwill	1,104,992	1,104,992
Intangible Assets, Net (Excluding Goodwill)	27,255	31,660
Servicing Asset at Fair Value, Amount	85,245	87,683
Interest Receivable	168,627	167,772
Other Assets	682,373	676,987
Assets, Total	43,993,729	43,023,068
Liabilities and Equity [Abstract]
Noninterest-Bearing Domestic Deposit, Demand	5,782,487	5,775,657
Interest-Bearing Deposit Liabilities, Domestic	28,365,079	28,872,777
Deposits, Total	34,147,565	34,648,434
Short-Term Debt	75,585	470,369
Federal Home Loan Bank, Advance, Branch of FHLBank, Amount	3,879,489	1,853,807
Other Long-Term Debt	593,530	837,635
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	35,276	38,776
Other Liabilities	481,503	568,485
Liabilities, Total	39,212,948	38,417,506
Equity, Attributable to Parent [Abstract]
Preferred Stock, Including Additional Paid in Capital	194,112	194,112
Common Stock, Value, Issued	1,890	1,890
Additional Paid in Capital, Common Stock	2,044,481	2,047,349
Retained Earnings (Accumulated Deficit)	3,049,383	2,919,252
Accumulated Other Comprehensive Income (Loss), Net of Tax	(14,297)	(74,416)
Treasury Stock, Value	(494,788)	(482,626)
Total Common Equity	4,586,669	4,411,450
Equity, Attributable to Parent, Total	4,780,781	4,605,562
Liabilities and Equity, Total	$ 43,993,729	$ 43,023,068
Preferred Stock, Shares Authorized	750,000	750,000
Preferred Stock, Shares Issued	200,000	200,000
Common Stock, Shares Authorized	250,000,000	250,000,000
Common Stock, Shares, Issued	189,016,409	189,016,409
Common Stock, Shares, Outstanding	165,778,220	166,177,658
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Residential Mortgage [Member]
Assets [Abstract]
Financing Receivable, Held-for-Sale	$ 96,804	$ 646,687
Loans and Leases Receivable, Net of Deferred Income	6,949,387	7,047,541
Liabilities and Equity [Abstract]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	600	600
Commercial Loan
Assets [Abstract]
Financing Receivable, Held-for-Sale	$ 8,406	$ 32,634