Consolidated Balance Sheets - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Assets [Abstract]
Cash and Due from Banks	$ 490,431,000	$ 544,059,000
Interest-Bearing Deposits in Banks and Other Financial Institutions	802,251,000	453,590,000
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	90,000	21,955,000
Debt Securities, Available-for-Sale	5,217,278,000	4,581,434,000
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	3,636,080,000	3,738,687,000
Equity Securities, FV-NI and without Readily Determinable Fair Value	26,000,000	23,242,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	251,642,000	179,665,000
Loans and Leases Receivable, Net of Deferred Income	30,951,964,000	29,768,586,000
Loans and Leases Receivable, Allowance	(378,341,000)	(363,545,000)
Loans and Leases Receivable, Net Amount	30,573,623,000	29,405,041,000
Other Short-Term Investments	245,239,000	258,886,000
Property, Plant and Equipment, Net	384,139,000	379,093,000
Life Insurance, Corporate or Bank Owned, Amount	693,511,000	689,000,000
Goodwill	1,104,992,000	1,104,992,000
Intangible Assets, Net (Excluding Goodwill)	25,052,000	31,660,000
Servicing Asset at Fair Value, Amount	85,063,000	87,683,000
Interest Receivable	168,451,000	167,772,000
Other Assets	677,458,000	676,987,000
Assets, Total	44,455,863,000	43,023,068,000
Liabilities and Equity [Abstract]
Noninterest-Bearing Domestic Deposit, Demand	5,906,251,000	5,775,657,000
Interest-Bearing Deposit Liabilities, Domestic	28,975,602,000	28,872,777,000
Deposits, Total	34,881,853,000	34,648,434,000
Short-Term Debt	399,665,000	470,369,000
Federal Home Loan Bank, Advance, Branch of FHLBank, Amount	3,220,679,000	1,853,807,000
Other Long-Term Debt	594,074,000	837,635,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	36,276,000	38,776,000
Other Liabilities	455,019,000	568,485,000
Liabilities, Total	39,587,565,000	38,417,506,000
Equity, Attributable to Parent [Abstract]
Preferred Stock, Including Additional Paid in Capital	194,112,000	194,112,000
Common Stock, Value, Issued	1,890,000	1,890,000
Additional Paid in Capital, Common Stock	2,047,634,000	2,047,349,000
Retained Earnings (Accumulated Deficit)	3,132,709,000	2,919,252,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(15,977,000)	(74,416,000)
Treasury Stock, Value	(492,070,000)	(482,626,000)
Total Common Equity	4,674,186,000	4,411,450,000
Equity, Attributable to Parent, Total	4,868,298,000	4,605,562,000
Liabilities and Equity, Total	$ 44,455,863,000	$ 43,023,068,000
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	165,904,108	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	$ 74,563,000	$ 646,687,000
Loans and Leases Receivable, Net of Deferred Income	6,858,285,000	7,047,541,000
Liabilities and Equity [Abstract]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	500,000	600,000
Commercial Loan
Assets [Abstract]
Financing Receivable, Held-for-Sale	$ 0	$ 32,634,000