CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Cash Flows [Abstract]
Net Cash Provided by (Used in) Operating Activities	$ 171,740	$ (3,002)
INVESTING ACTIVITIES
Purchases of securities	(226,971)	(90,348)
Proceeds from maturities, prepayments and calls of securities	109,499	176,103
Proceeds from sales of securities	1,917	1,349
Net proceeds from sales of Federal Home Loan Bank stock	3,137	7,200
Net decrease (increase) in loans	220,854	(350,884)
Proceeds from sale of portfolio loans	3,438	0
Purchases of premises and equipment	(2,110)	(4,356)
Proceeds from the sale of premises and equipment	14	15
Proceeds from life insurance settlement	353	0
Net Cash Provided by (Used in) Investing Activities	110,131	(260,921)
FINANCING ACTIVITIES
Net increase in core deposits	710,776	746,580
Net decrease in certificates of deposit	(186,115)	(148,573)
Net increase in securities sold under repurchase agreements	7,423	22,818
Net decrease in short-term borrowings	(75,000)	(198,319)
Repayments on long-term borrowings	(988)	(1,792)
Treasury shares issued-net	(302)	(594)
Cash dividends paid to common shareholders	(32,954)	(32,972)
Repurchase of common stock	0	(12,559)
Net Cash Provided by Financing Activities	422,840	374,589
Net increase in cash and cash equivalents	704,711	110,666
Cash and cash equivalents at beginning of period	229,666	197,823
Cash and Cash Equivalents at End of Period	934,377	308,489
Supplemental Disclosures
Loans transferred to held for sale	4,467	0
Interest paid	12,200	37,437
Income taxes paid, net of refunds	19,183	6,210
Transfers of loans to other real estate owned	$ 12,392	$ 631