CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net Income	$ 135,520	$ 110,343	$ 21,040
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	8,366	16,215	131,424
Depreciation and amortization	9,027	11,480	12,066
Net amortization of discounts and premiums	6,062	5,482	4,205
Stock-based compensation expense	3,188	2,427	724
Securities (gains) losses	(198)	(29)	(142)
Deferred income taxes	(2,932)	2,383	(4,402)
Loss (gain) on sale of fixed assets	61	30	(23)
Gain on sale and fair value adjustments of other real estate owned, net	(3,119)	420	108
Gain on the sale of loans, net	(1,229)	(8,856)	(8,998)
Pension contribution	0	0	(115)
Net change in:
Mortgage loans originated for sale	(35,848)	(286,257)	(361,704)
Proceeds from sale of mortgage loans	38,583	311,479	357,613
Net (increase) decrease in interest receivable	(10,033)	3,561	(2,560)
Net increase (decrease) in interest payable	2,901	(2,087)	(3,178)
Net (increase) decrease in other assets	(24,628)	83,830	(144,898)
Net increase (decrease) in other liabilities	114,713	(35,569)	50,392
Net Cash Provided by Operating Activities	240,434	214,852	51,552
INVESTING ACTIVITIES
Purchases of securities	(401,054)	(313,617)	(178,389)
Proceeds from maturities, prepayments and calls of securities	160,830	144,905	205,606
Proceeds from sales of securities	30,490	1,917	1,349
Purchases of Federal Home Loan Bank stock	(48,272)	(22,515)	(33,755)
Proceeds from redemption of Federal Home Loan Bank stock	34,757	26,026	43,702
Net (increase) decrease in loans	(192,403)	173,401	(194,768)
Proceeds from the sale of portfolio loans	8,024	5,107	547
Purchases of premises and equipment	(3,863)	(3,611)	(5,416)
Proceeds from the sale of premises and equipment	161	14	23
Proceeds from sale of other real estate owned	12,529	1,259	1,899
Proceeds from settlement of bank owned life insurance	214	353	0
Net Cash Provided by (Used in) Investing Activities	(398,587)	13,239	(159,202)
FINANCING ACTIVITIES
Net (decrease) increase in core deposits	(623,076)	875,378	591,932
Net (decrease) in certificates of deposit	(153,400)	(299,292)	(207,106)
Net (decrease) increase in securities sold under repurchase agreements	(84,491)	19,328	45,275
Net increase (decrease) in short-term borrowings	370,000	(75,000)	(206,319)
Repayments of long-term borrowings	(7,689)	(11,001)	(27,187)
Repurchase of shares for taxes on restricted stock	(808)	(630)	(594)
Repurchase of S&T stock	(7,637)	0	(12,559)
Cash dividends paid to common shareholders	(46,952)	(44,325)	(43,949)
Net Cash Provided by Financing Activities	(554,053)	464,458	139,493
Net (decrease) increase in cash and cash equivalents	(712,206)	692,549	31,843
Cash and cash equivalents at beginning of year	922,215	229,666	197,823
Cash and Cash Equivalents at End of Year	210,009	922,215	229,666
Supplemental Disclosures
Cash paid for interest	22,068,000	15,236	44,353
Cash paid for income taxes, net of refunds	31,175	24,213	6,231
Loans transferred to held for sale	0	4,467	640
Leased right-of-use operating assets and lease liabilities added to Balance Sheet	0	2,987	91
Transfers to other real estate owned and other repossessed assets	$ 23	$ 12,392	$ 631