Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net Income	$ 225,804	$ 253,372	$ 153,804
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	(7,800)	(50,500)	117,800
Depreciation and Amortization	21,377	21,084	20,205
Amortization of Deferred Loans and Leases Fees, Net	(215)	(16,728)	(3,197)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	20,824	36,488	27,586
Amortization of Operating Lease Right-of-Use-Assets	11,843	11,493	12,281
Share-Based Compensation	16,066	13,267	7,578
Benefit Plan Contributions	(1,679)	(1,687)	(1,615)
Deferred Income Taxes	(2,713)	3,020	(42,586)
Gains on Sale of Premises and Equipment		(8,655)	(1,850)
Loss on Agreement to Sell Assets That Will Terminate Certain Leveraged Leases	6,918
Impairment on Leveraged Lease			2,951
Impairment on In-Store Branches Closures and ATMs			4,168
Net Gains on Sales of Loans and Leases	(4,100)	(14,889)	(12,875)
Net (Gains) Losses on Investment Securities	6,111	1,297	(9,932)
Proceeds from Sales of Loans Held for Sale	133,715	508,199	394,196
Originations of Loans Held for Sale	(106,965)	(408,210)	(394,649)
Net Tax Benefits from Share-Based Compensation	166	1,611	485
Net Change in Other Assets and Other Liabilities	13,608	27,989	(127,934)
Net Cash Provided by Operating Activities	332,960	377,151	146,416
Investment Securities Available-for-Sale:
Proceeds from Sales, Prepayments and Maturities	677,087	1,487,043	1,003,432
Purchases	(1,058,922)	(2,100,693)	(2,114,912)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	645,463	1,221,585	1,420,853
Purchases	(91,229)	(2,676,376)	(1,661,180)
Net Change in Loans and Leases	(1,397,056)	(342,767)	(990,169)
Premises and Equipment, Net	(28,761)	(22,372)	(33,287)
Proceeds from Sale of Premises and Equipment		10,246	1,981
Net Cash Used in Investing Activities	(1,253,418)	(2,423,334)	(2,373,282)
Financing Activities
Net Change in Deposits	255,588	2,148,487	2,427,147
Net Change in Short-Term Borrowings	275,000	(150,100)	(3,716)
Proceeds from Other Debt	400,000		50,000
Repayments of Other Debt	(97)	(50,090)	(75,084)
Proceeds from Issuance of Preferred Stock		175,487
Proceeds from Issuance of Common Stock	6,797	13,611	9,389
Repurchase of Common Stock	(55,063)	(31,258)	(18,006)
Cash Dividends Paid on Common Stock	(112,557)	(110,633)	(107,434)
Cash Dividends Paid on Preferred Stock	(7,877)	(2,975)
Net Cash Provided by Financing Activities	761,791	1,992,529	2,282,296
Net Change in Cash and Cash Equivalents	(158,667)	(53,654)	55,430
Cash and Cash Equivalents at Beginning of Period	560,434	614,088	558,658
Cash and Cash Equivalents at End of Period	401,767	560,434	614,088
Supplemental Information
Cash Paid for Interest	49,609	32,044	53,026
Cash Paid for Income Taxes	53,025	48,764	60,182
Non-Cash Investing and Financing Activities:
Transfer of Investment Securities from Available-for-Sale to Held-to-Maturity	1,275,043
Transfers from Loans to Loans Held for Sale	$ 380	$ 34,647	$ 32,423