Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net Income	$ 34,742	$ 58,799
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	33,600	3,000
Depreciation and Amortization	4,767	3,996
Amortization of Deferred Loan and Lease Fees	462	(381)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	5,164	5,290
Amortization of Operating Lease Right-of-Use Assets	3,114	3,185
Share-Based Compensation	1,497	2,274
Benefit Plan Contributions	(403)	(372)
Deferred Income Taxes	(6,942)	(2,363)
Gains on Sale of Premises and Equipment	0	(558)
Net Gains on Sales of Loans and Leases	(1,956)	(1,065)
Net Losses (Gains) on Sales of Investment Securities	970	835
Proceeds from Sales of Loans Held for Sale	129,913	56,453
Originations of Loans Held for Sale	(110,415)	(63,014)
Net Tax Benefits from Share-Based Compensation	524	530
Net Change in Other Assets and Other Liabilities	(99,892)	(49,491)
Net Cash Provided by (Used in) Operating Activities	(4,855)	17,118
Investment Securities Available-for-Sale:
Proceeds from Sales, Prepayments and Maturities	230,435	495,824
Purchases	(238,997)	(341,234)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	236,134	177,841
Purchases	(201,130)	(367,178)
Net Change in Loans and Leases	(364,878)	(104,120)
Purchases of Premises and Equipment	12,607	11,583
Proceeds from Sale of Premises and Equipment	0	639
Net Cash Used in Investing Activities	(351,043)	(149,811)
Financing Activities
Net Change in Deposits	270,879	240,068
Net Change in Short-Term Borrowings	148,900	(196)
Repayments of Long-Term Debt	(25,020)	(25,019)
Proceeds from Issuance of Common Stock	3,658	1,994
Repurchase of Common Stock	(17,633)	(43,189)
Cash Dividends Paid	(26,835)	(25,646)
Net Cash Provided by Financing Activities	353,949	148,012
Net Change in Cash and Cash Equivalents	(1,949)	15,319
Cash and Cash Equivalents at Beginning of Period	558,658	525,969
Cash and Cash Equivalents at End of Period	556,709	541,288
Supplemental Information
Cash Paid for Interest	19,088	20,583
Cash Paid for Income Taxes	3,459	2,764
Non-Cash Investing and Financing Activities:
Initial Recognition of Operating Lease Right-of-Use Assets	98,695
Initial Recognition of Operating Lease Liabilities	106,180
Transfer from Loans to Foreclosed Real Estate	$ 0	$ 1,869