Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities
Net Income	$ 54,834	$ 59,949
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	(5,500)	(14,300)
Depreciation and Amortization	5,308	5,238
Amortization of Deferred Loan and Lease (Fees) Costs, Net	(856)	(2,486)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	7,031	8,878
Amortization of Operating Lease Right-of-Use Assets	2,903	2,839
Share-Based Compensation	4,010	2,780
Benefit Plan Contributions	(417)	(470)
Deferred Income Taxes	3,332	6,397
Net Gains on Sales of Loans and Leases	(1,724)	(6,558)
Net Losses (Gains) on Sales of Investment Securities	1,545	1,203
Proceeds from Sales of Loans Held for Sale	77,591	171,763
Originations of Loans Held for Sale	(55,110)	(102,017)
Net Tax Benefits from Share-Based Compensation	214	331
Net Change in Other Assets and Other Liabilities	(51,366)	48,860
Net Cash Provided by Operating Activities	41,795	182,407
Investment Securities Available-for-Sale:
Proceeds from Sales, Prepayments and Maturities	249,585	289,659
Purchases	(481,723)	(594,678)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	216,409	325,969
Purchases	(15,240)	(533,839)
Net Change in Loans and Leases	(284,797)	(204,500)
Purchases of Premises and Equipment	(5,658)	(3,649)
Net Cash Used in Investing Activities	(321,424)	(721,038)
Financing Activities
Net Change in Deposits	356,179	1,345,030
Net Change in Short-Term Borrowings		(100)
Repayments of Long-Term Debt	(24)	(22)
Proceeds from Issuance of Common Stock	2,288	2,704
Repurchase of Common Stock	(13,960)	(3,189)
Cash Dividends Paid on Common Stock	(28,265)	(27,026)
Cash Dividends Paid on Preferred Stock	(1,969)
Net Cash Provided by Financing Activities	314,249	1,317,397
Net Change in Cash and Cash Equivalents	34,620	778,766
Cash and Cash Equivalents at Beginning of Period	560,434	614,088
Cash and Cash Equivalents at End of Period	595,054	1,392,854
Supplemental Information
Cash Paid for Interest	5,264	9,204
Cash Paid for Income Taxes	3,069	$ 2,771
Non-Cash Investing and Financing Activities:
Transfer from Loans to Loans Held for Sale	$ 380