S&T Bancorp (STBA) 10-K 28 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 23, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	0-12508
Entity Registrant Name	S&T BANCORP, INC.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1434426
Entity Address, Address Line One	800 Philadelphia Street
Entity Address, City or Town	Indiana
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15701
City Area Code	800
Local Phone Number	325-2265
Title of 12(b) Security	Common Stock, par value $2.50 per share
Trading Symbol	STBA
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1,148,828,816
Entity Common Stock, Shares Outstanding		36,703,796
Documents Incorporated by Reference	Portions of the definitive Proxy Statement of S&T Bancorp, Inc., to be filed pursuant to Regulation 14A for the annual meeting of shareholders to be held May 16, 2022, are incorporated by reference into Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000719220

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Audit Information [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Pittsburgh, Pennsylvania

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks, including interest-bearing deposits of $857,192 and $158,903 at December 31, 2021 and December 31, 2020	$ 922,215	$ 229,666
Securities, at fair value	910,793	773,693
Loans held for sale	1,522	18,528
Portfolio loans, net of unearned income	6,999,990	7,225,860
Allowance for credit losses	(98,576)	(117,612)
Portfolio loans, net	6,901,414	7,108,248
Bank owned life insurance	83,685	82,303
Premises and equipment, net	52,632	55,614
Federal Home Loan Bank and other restricted stock, at cost	9,519	13,030
Goodwill	373,424	373,424
Other intangible assets, net	6,895	8,675
Other assets	226,430	304,716
Total Assets	9,488,529	8,967,897
Deposits:
Noninterest-bearing demand	2,748,586	2,261,994
Interest-bearing demand		864,510
Money market		1,937,063
Savings		969,508
Certificates of deposit	1,088,071	1,387,463
Total Deposits	7,996,524	7,420,538
Securities sold under repurchase agreements	84,491	65,163
Short-term borrowings	0	75,000
Long-term borrowings	22,430	23,681
Junior subordinated debt securities	54,393	64,083
Other liabilities	124,237	164,721
Total Liabilities	8,282,075	7,813,186
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—41,449,444 shares at December 31, 2021 and December 31, 2020 Outstanding—39,351,194 shares at December 31, 2021 and 39,298,007 shares at December 31, 2020	103,623	103,623
Additional paid-in capital	403,095	400,668
Retained earnings	773,659	710,061
Accumulated other comprehensive (loss) income	(7,090)	8,971
Treasury stock — 2,098,250 shares at December 31, 2021 and 2,151,437 shares at December 31, 2020, at cost	(66,833)	(68,612)
Total Shareholders’ Equity	1,206,454	1,154,711
Total Liabilities and Shareholders’ Equity	$ 9,488,529	$ 8,967,897

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks, interest-bearing amounts	$ 857,192	$ 158,903
SHAREHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	41,449,444	41,449,444
Common stock, shares outstanding (in shares)	39,351,194	39,298,007
Treasury stock, shares (in shares)	2,098,250	2,151,437

CONSOLIDATED STATEMENTS OF NET

CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INTEREST AND DIVIDEND INCOME
Loans, including fees		$ 270,460	$ 300,960	$ 300,625
Investment securities:
Taxable		15,706	14,918	14,733
Tax-exempt		2,593	3,497	3,302
Dividends		503	1,089	1,824
Total Interest and Dividend Income		289,262	320,464	320,484
INTEREST EXPENSE
Deposits		10,757	35,986	63,026
Borrowings and junior subordinated debt securities		2,393	5,090	10,667
Total Interest Expense		13,150	41,076	73,693
NET INTEREST INCOME		276,112	279,388	246,791
Provision for credit losses	[1]	16,215	131,424	14,873
Net Interest Income After Provision for Credit Losses		259,897	147,964	231,918
NONINTEREST INCOME
Net gain (loss) on sale of securities		29	142	(26)
Mortgage banking		9,734	10,923	2,491
Commercial loan swap income		1,146	4,740	5,503
Other		7,820	5,267	9,246
Total Noninterest Income		64,610	59,719	52,558
NONINTEREST EXPENSE
Salaries and employee benefits		100,214	90,115	83,986
Data processing and information technology		16,681	15,499	14,468
Occupancy		14,544	14,529	12,103
Furniture, equipment and software		10,684	11,050	8,958
Other taxes		6,644	6,622	3,364
Professional services and legal		6,368	6,394	4,244
Marketing		4,553	5,996	4,631
FDIC insurance		4,224	5,089	758
Merger related expenses		0	2,342	11,350
Other		24,927	29,008	23,254
Total Noninterest Expense		188,839	186,644	167,116
Income Before Taxes		135,668	21,039	117,360
Income taxes (benefit) expense		25,325	(1)	19,126
Net Income		$ 110,343	$ 21,040	$ 98,234
Earnings per common share—basic (in dollars per share)		$ 2.81	$ 0.54	$ 2.84
Earnings per common share—diluted (in dollars per share)		2.81	0.53	2.82
Dividends declared per common share (in dollars per share)		$ 1.13	$ 1.12	$ 1.09
Debit and credit card
NONINTEREST INCOME
Revenue from contract with customer		$ 17,952	$ 15,093	$ 13,405
Service charges on deposit accounts
NONINTEREST INCOME
Revenue from contract with customer		15,040	13,597	13,316
Wealth management
NONINTEREST INCOME
Revenue from contract with customer		$ 12,889	$ 9,957	$ 8,623
[1]	(1) Beginning January 1, 2020, provision for credit losses is based on current expected credit loss methodology due to the adoption of CECL. Prior to January 1, 2020, it was based on incurred loss methodology.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income		$ 110,343	$ 21,040	$ 98,234
Other Comprehensive Income (Loss), Before Tax:
Net change in unrealized (losses) gains on debt securities available-for-sale		(23,972)	22,683	15,793
Net available-for-sale securities losses reclassified into earnings	[1]	0	0	26
Adjustment to funded status of employee benefit plans		3,561	3,549	(1,282)
Other Comprehensive (Loss) Income, Before Tax		(20,411)	26,232	14,537
Income tax benefit (expense) related to items of other comprehensive income		4,350	(5,591)	(3,100)
Other Comprehensive (Loss) Income, After Tax		(16,061)	20,641	11,437
Comprehensive Income		$ 94,282	$ 41,681	$ 109,671
[1]	Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Net Income as follows: the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)/Income	Treasury Stock	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, AdjustmentRetained Earnings
Beginning balance at Dec. 31, 2018	$ 935,761	$ 90,326	$ 210,345	$ 701,819	$ (23,107)	$ (43,622)	$ 167	$ 167
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	98,234			98,234
Other comprehensive income, net of tax	11,437				11,437
Cash dividends declared	(37,360)			(37,360)
Common stock issuance cost	(176)		(176)
Common stock issued in acquisition	200,631	13,297	187,334
Treasury stock repurchased	(18,222)					(18,222)
Treasury stock issued	(915)			(1,777)		862
Recognition of restricted stock compensation expense	2,441		2,441
Ending balance at Dec. 31, 2019	$ 1,191,998	103,623	399,944	761,083	(11,670)	(60,982)	$ (22,590)	$ (22,590)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Net Income	$ 21,040			21,040
Other comprehensive income, net of tax	20,641				20,641
Cash dividends declared	(43,949)			(43,949)
Treasury stock repurchased	(12,559)					(12,559)
Treasury stock issued	(594)			(5,523)		4,929
Recognition of restricted stock compensation expense	724		724
Ending balance at Dec. 31, 2020	1,154,711	103,623	400,668	710,061	8,971	(68,612)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	110,343			110,343
Other comprehensive income, net of tax	(16,061)				(16,061)
Cash dividends declared	(44,336)			(44,336)
Treasury stock repurchased	0
Treasury stock issued	(630)			(2,409)		1,779
Recognition of restricted stock compensation expense	2,427		2,427
Ending balance at Dec. 31, 2021	$ 1,206,454	$ 103,623	$ 403,095	$ 773,659	$ (7,090)	$ (66,833)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share (in dollars per share)	$ 1.13	$ 1.12	$ 1.09
Common stock issued in acquisition (in shares)			5,318,962
Treasury stock repurchased (in shares)	0	411,430	470,708
Treasury stock issued (in shares)	53,187	149,133	28,174

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net Income		$ 110,343	$ 21,040	$ 98,234
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	[1]	16,215	131,424	14,873
Provision for unfunded loan commitments		0	0	436
Depreciation and amortization		11,480	12,066	11,724
Net amortization of discounts and premiums		5,482	4,205	3,243
Stock-based compensation expense		2,427	724	2,441
Securities (gains) losses		(29)	(142)	26
Deferred income taxes		2,383	(4,402)	(381)
Loss (gain) on sale of fixed assets		30	(23)	37
Gain on the sale of loans, net		(8,856)	(8,998)	(1,887)
Pension contribution		0	(115)	0
Net change in:
Mortgage loans originated for sale		(286,257)	(361,704)	(109,624)
Proceeds from sale of mortgage loans		311,479	357,613	109,082
Net decrease (increase) in interest receivable		3,561	(2,560)	(3,768)
Net decrease in interest payable		(2,087)	(3,178)	(2,223)
Net decrease (increase) in other assets		85,509	(142,891)	(8,286)
Net (decrease) increase in other liabilities		(35,569)	50,392	24,496
Net Cash Provided by Operating Activities		216,111	53,451	138,423
INVESTING ACTIVITIES
Purchases of securities available-for-sale		(313,617)	(178,389)	(129,973)
Proceeds from maturities, prepayments and calls of securities available-for-sale		144,905	205,606	92,412
Proceeds from sales of securities available-for-sale		1,917	1,349	59,934
Purchases of Federal Home Loan Bank stock		(22,515)	(33,755)	(61,852)
Proceeds from redemption of Federal Home Loan Bank stock		26,026	43,702	68,467
Net decrease (increase) in loans		173,401	(194,768)	(298,741)
Proceeds from the sale of loans not originated for resale		5,107	547	520
Purchases of premises and equipment		(3,611)	(5,416)	(5,153)
Proceeds from the sale of premises and equipment		14	23	71
Net cash acquired from bank acquisitions		0	0	63,759
Proceeds from settlement of bank owned life insurance		353	0	0
Net Cash Provided by (Used in) Investing Activities		11,980	(161,101)	(210,556)
FINANCING ACTIVITIES
Net increase in core deposits		875,378	591,932	423,203
Net decrease in certificates of deposit		(299,292)	(207,106)	(27,632)
Net increase in securities sold under repurchase agreements		19,328	45,275	1,505
Net decrease in short-term borrowings		(75,000)	(206,319)	(200,000)
Proceeds from long-term borrowings		0	0	10,000
Repayments of long-term borrowings		(11,001)	(27,187)	(35,936)
Treasury shares issued - net		(630)	(594)	(915)
Repurchase common stock		0	(12,559)	(18,222)
Costs to issue equity securities		0	0	(176)
Cash dividends paid to common shareholders		(44,325)	(43,949)	(37,360)
Net Cash Provided by Financing Activities		464,458	139,493	114,467
Net increase in cash and cash equivalents		692,549	31,843	42,334
Cash and cash equivalents at beginning of year		229,666	197,823	155,489
Cash and Cash Equivalents at End of Year		922,215	229,666	197,823
Supplemental Disclosures
Interest paid		15,236	44,353	75,278
Income taxes paid, net of refunds		24,213	6,231	14,663
Loans transferred to held for sale		4,467	640	456
Leased right-of-use operating assets and lease liabilities added to Balance Sheet		2,987	91	49,490
Net assets (liabilities) from acquisitions, excluding cash and cash equivalents		0	0	43,637
Transfers to other real estate owned and other repossessed assets		$ 12,392	$ 631	$ 2,592
[1]	(1) Beginning January 1, 2020, provision for credit losses is based on current expected credit loss methodology due to the adoption of CECL. Prior to January 1, 2020, it was based on incurred loss methodology.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations S&T Bancorp, Inc., or S&T, was incorporated on March 17, 1983 under the laws of the Commonwealth of Pennsylvania as a bank holding company and has five active direct wholly owned subsidiaries, S&T Bank, 9th Street Holdings, Inc., STBA Capital Trust I, DNB Capital Trust I and DNB Capital Trust II. DNB Capital Trust I and DNB Capital Trust II were acquired with the DNB merger on November 30, 2019. We own a 50 percent interest in Commonwealth Trust Credit Life Insurance Company, or CTCLIC. We are presently engaged in non-banking activities through the following six entities: 9th Street Holdings, Inc.; S&T Bancholdings, Inc.; CTCLIC; S&T Insurance Group, LLC; Stewart Capital Advisors, LLC; DN Acquisition, Inc. 9th Street Holdings, Inc. and S&T Bancholdings, Inc. are investment holding companies. CTCLIC, which is a joint venture with another financial institution, acts as a reinsurer of credit life, accident and health insurance policies sold by S&T Bank and the other institution. S&T Insurance Group, LLC, through its subsidiaries, offers a variety of insurance products. Stewart Capital Advisors, LLC is a registered investment advisor that manages private investment accounts for individuals and institutions. DN Acquisition Company, Inc. was acquired with the DNB merger and was incorporated for the purpose of acquiring and holding Other Real Estate Owned acquired through foreclosure or deed in-lieu-of foreclosure, as well as Bank-occupied real estate. On June 5, 2019, we entered into an agreement to acquire DNB Financial Corporation, or DNB, and the transaction was completed on November 30, 2019. The transaction was valued at $201.0 million and added total assets of $1.1 billion, including $909.0 million in loans, $84.2 million in goodwill and $967.3 million in deposits. Accounting Policies Our financial statements have been prepared in accordance with GAAP. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the dates of the balance sheets and revenues and expenses for the periods then ended. Actual results could differ from those estimates. Our significant accounting policies are described below. Principles of Consolidation The Consolidated Financial Statements include the accounts of S&T and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting. Reclassification Amounts in prior years' financial statements and footnotes are reclassified whenever necessary to conform to the current year’s presentation. Reclassifications had no effect on our results of operations or financial condition. Business Combinations We account for business combinations using the acquisition method of accounting. All identifiable assets acquired, liabilities assumed and any non-controlling interest in the acquiree are recognized and measured as of the acquisition date at fair value. We record goodwill for the excess of the purchase price over the fair value of net assets acquired. Results of operations of the acquired entities are included in the Consolidated Statement of Net Income from the date of acquisition. Acquired loans are recorded at fair value on the date of acquisition with no carryover of the related allowance for credit losses, or ACL. Determining the fair value of acquired loans involves estimating the principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. In estimating the fair value of our acquired loans, we considered a number of factors including loss rates, internal risk rating, delinquency status, loan type, loan term, prepayment rates, recovery periods and the current interest rate environment. The premium or discount estimated through the loan fair value calculation is recognized into interest income on a level yield basis over the remaining life of the loans. Acquired loans, including those acquired in a business combination, are evaluated to determine if they have experienced more-than-insignificant deterioration in credit quality since origination. When the condition exists, these loans are referred to as purchased credit deteriorated, or PCD. An allowance is recognized for a PCD loan by adding it to the purchase price or fair value in a business combination. There is no provision for credit losses, or PCL, recognized upon acquisition of a PCD loan since the initial allowance is established through the purchase accounting. After initial recognition, the accounting for a PCD loan follows the credit loss model that applies to that type of asset. Purchased financial loans that do not have a more-than-significant deterioration in credit quality since origination are accounted for in a manner consistent with originated loans. An ACL is recorded with a corresponding charge to PCL. Subsequent to the acquisition date, the methods utilized to estimate the required ACL for these loans is similar to the method used for originated loans. Prior to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, the methods utilized to estimate the required allowance for loan losses, or ALL for acquired loans was similar to the method used for originated loans; however, we recorded a provision for credit losses only when the required allowance exceeded the remaining fair value adjustment. Acquired loans were considered impaired if there was evidence of credit deterioration since origination and if it was probable at time of acquisition that all contractually required payments would not be collected. Fair Value Measurements We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, individually assessed loans, other real estate owned, or OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets. Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which are developed based on market data we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances. The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred. The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis. Recurring Basis Debt Securities Available-for-Sale We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing services which provide us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The fair value of U.S. treasury securities are based on quoted market prices in active markets and are classified as Level 1. The market valuation sources for other debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models and extensive quality control programs. Equity Securities Marketable equity securities with quoted prices in active markets for identical assets are classified as Level 1. Marketable equity securities in markets that are not active and are based on other observable information for comparable assets are classified as Level 2. Securities Held in a Deferred Compensation Plan We use quoted market prices to determine the fair value of our equity security assets. These securities are reported at fair value with the gains and losses included in other noninterest income in our Consolidated Statements of Net Income. These assets are held in a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1. Deferred compensation plan assets are reported in other assets in the Consolidated Balance Sheets. Derivative Financial Instruments We use derivative instruments, including interest rate swaps for commercial loans with our customers, interest rate lock commitments and forward commitments related to the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, such as interest rate curves and implied volatilities. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties’ nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings. Interest rate swaps for commercial loans are classified as Level 2. Interest rate lock commitments and forward commitments related to mortgage loans are classified as Level 3 due to significant unobservable inputs. Nonrecurring Basis Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale marked to fair value are classified as Level 3. Loans Individually Evaluated Loans that are individually evaluated to determine whether a specific allocation of ACL is needed are reported at the lower of amortized cost or fair value. Fair value is determined using the following methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Loans individually evaluated that are market to fair value are classified as Level 3. OREO and Other Repossessed Assets OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3. OREO and other repossessed assets are reported in other assets in the Consolidated Balance Sheets. Mortgage Servicing Rights MSRs are reported pursuant to the amortization method are evaluated for impairment quarterly by comparing the carrying value to the fair value of the MSRs. The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into mortgage banking in noninterest income in the Consolidated Statements of Net Income. Financial Instruments In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments. Cash and Cash Equivalents The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits approximate fair value. Loans Our methodology to fair value loans includes an exit price notion. The fair value of variable rate loans that may reprice frequently at short-term market rates is based on carrying values adjusted for liquidity and credit risk. The fair value of variable rate loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for liquidity and credit risk. The fair value of fixed rate loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk. Federal Home Loan Bank, or FHLB, and Other Restricted Stock It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; it is presented at carrying value. Collateral Receivable Collateral receivable is cash that is made available to counterparties as collateral for our interest rate swaps. The carrying amount included in other assets on our Consolidated Balance Sheets approximates fair value. Deposits The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value. Short-Term Borrowings The carrying amounts of securities sold under repurchase agreements, or REPOs, and other short-term borrowings approximate their fair values. Long-Term Borrowings The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values. Junior Subordinated Debt Securities The interest rate on the variable rate junior subordinated debt securities is reset quarterly; therefore, the carrying values approximate their fair values. Cash and Cash Equivalents We consider cash and due from banks, interest-bearing deposits with banks and federal funds sold as cash and cash equivalents. Securities We determine the appropriate classification of securities at the time of purchase. Debt securities are classified as available-for-sale with the intent to hold for an indefinite period of time, but may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. A determination will be made on whether a decline in the fair value below the amortized cost basis is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in Other Comprehensive Income, or OCI, net of applicable taxes. Credit-related impairment is recognized as an ACL on the balance sheet with a corresponding adjustment to provision for credit losses in the Consolidated Statements of Net Income. Both the allowance and the adjustment to net income can be reversed if conditions change. Our policy for credit impairment within the debt securities portfolio is based upon a number of factors, including but not limited to, the financial condition of the underlying issuer, the ability of the issuer to meet contractual obligations, the likelihood of the security’s ability to recover any decline in its estimated fair value and whether management intends to sell the security or if it is more likely than not that management will be required to sell the investment security prior to the security’s recovery of any decline in its estimated fair value. Realized gains and losses on the sale of these securities are determined using the specific-identification method and are recorded within noninterest income in the Consolidated Statements of Net Income. Bond premiums are amortized to the call date and bond discounts are accreted to the maturity date, both on a level yield basis. Equity securities are measured at fair value with net unrealized gains and losses recognized in other noninterest income in the Consolidated Statements of Net Income. Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. If a loan is transferred from the loan portfolio to the held for sale category, any write-down in the carrying amount of the loan at the date of transfer is recorded as a charge-off against the ACL. Subsequent declines in fair value are recognized as a charge to other noninterest income. When a loan is placed in the held for sale category, we stop amortizing the related deferred fees and costs. The remaining unamortized fees and costs are recognized as part of the cost basis of the loan at the time it is sold. Gains and losses on sales of mortgage loans held for sale are included in mortgage banking in noninterest income in the Consolidated Statements of Net Income. Loans Loans are reported at the principal amount outstanding net of unearned income, unamortized premiums or discounts and deferred origination fees and costs. We defer certain nonrefundable loan origination and commitment fees. Accretion of discounts and amortization of premiums on loans are included in interest income in the Consolidated Statements of Net Income. Loan origination fees and direct loan origination costs are deferred and amortized as an adjustment of loan yield over the respective lives of the loans without consideration of anticipated prepayments. If a loan is paid off, the remaining unaccreted or unamortized net origination fees and costs are immediately recognized into income or expense. Interest is accrued and interest income is recognized on loans as earned. Acquired loans are recorded at fair value on the date of acquisition with no carryover of the related ACL. Determining the fair value of the acquired loans involves estimating the principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. In estimating the fair value of our acquired loans, we consider a number of factors including the loan term, internal risk rating, delinquency status, prepayment rates, recovery periods, estimated value of the underlying collateral and the current interest rate environment. Closed-end installment loans, amortizing loans secured by real estate and any other loans with payments scheduled monthly are reported past due when the borrower is in arrears two or more monthly payments. Other multi-payment obligations with payments scheduled other than monthly are reported past due when one scheduled payment is due and unpaid for 30 days or more. Generally, consumer loans are charged off against the ACL upon the loan reaching 90 days past due. Commercial loans are charged off as management becomes aware of facts and circumstances that raise doubt as to the collectability of all or a portion of the principal and when we believe a confirmed loss exists. Nonaccrual or Nonperforming Loans We stop accruing interest on a loan when the borrower’s payment is 90 days past due. Loans are also placed on nonaccrual status when we have doubt about the borrower’s ability to comply with contractual repayment terms, even if payment is not past due. When the interest accrual is discontinued, all unpaid accrued interest is reversed against interest income. As a general rule, a nonaccrual loan may be restored to accrual status when its principal and interest is paid current and the bank expects repayment of the remaining contractual principal and interest, or when the loan otherwise becomes well secured and in the process of collection. Troubled Debt Restructurings Troubled debt restructurings, or TDRs, are loans where we, for economic or legal reasons related to a borrower’s financial difficulties, grant a concession to the borrower. We strive to identify borrowers with financial difficulty early and work with them to come to a mutual resolution to modify the terms of their loan before the loan reaches nonaccrual status. These modified terms generally include extensions of maturity dates at a stated interest rate lower than the current market rate for a new loan with similar risk characteristics, reductions in contractual interest rates or principal deferment. While unusual, there may be instances of principal forgiveness. These modifications are generally for longer term periods that would not be considered insignificant. Additionally, we classify loans where the debt obligation has been discharged through a Chapter 7 Bankruptcy and not reaffirmed as TDRs. We individually evaluate all substandard commercial loans that have experienced a forbearance or change in terms agreement, and all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan, to determine if they should be designated as TDRs. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring. Allowance for Credit Losses The ACL is a valuation reserve established and maintained by charges against operating income and is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the ACL when they are deemed uncollectible. The ACL is an estimate of expected credit losses, measured over the contractual life of a loan, that considers our historical loss experience, current conditions and forecasts of future economic conditions. Determination of an appropriate ACL is inherently subjective and may have significant changes from period to period. The methodology for determining the ACL has two main components: evaluation of expected credit losses for certain groups of homogeneous loans that share similar risk characteristics and evaluation of loans that do not share risk characteristics with other loans. The ACL for homogeneous loans is calculated using a life-time loss rate methodology with both a quantitative and a qualitative analysis that is applied on a quarterly basis. The ACL model is comprised of six distinct portfolio segments: 1) Construction, 2) Commercial Real Estate, or CRE, 3) Commercial and Industrial, or C&I, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. Each segment has a distinct set of risk characteristics monitored by management. We further evaluate the ACL at a disaggregated level which includes type of collateral and our internal risk rating system for the commercial segments and type of collateral, lien position, and FICO score, for the consumer segments. Historical credit loss experience is the basis for the estimation of expected credit losses. Our quantitative model uses historic data back to the second quarter of 2009. We apply historical loss rates to pools of loans with similar risk characteristics. After consideration of the historic loss calculation, management applies qualitative adjustments to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information at the balance sheet date. Our reasonable and supportable forecast adjustment is based on the unemployment forecast and management judgment. For periods beyond our two year reasonable and supportable forecast, we revert to historical loss rates utilizing a straight-line method over a one year reversion period. The qualitative adjustments for current conditions are based upon changes in lending policies and practices, experience and ability of lending staff, quality of the bank’s loan review system, value of underlying collateral, the existence of and changes in concentrations, other external factors and segment specific risks. These modified historical loss rates are multiplied by the outstanding principal balance of each loan to calculate a required reserve. A similar process is employed to calculate a reserve assigned to off-balance sheet commitments, specifically unfunded loan commitments and letters of credit, and any needed reserve is recorded in other liabilities. The ACL for individual loans begins with the use of normal credit review procedures to identify whether a loan no longer shares similar risk characteristics with other pooled loans and therefore, should be individually assessed. We evaluate all commercial loans greater than $1.0 million that meet the following criteria: 1) when it is determined that foreclosure is probable, 2) substandard, doubtful and nonperforming loans when repayment is expected to be provided substantially through the operation or sale of the collateral, 3) any commercial TDR, or any loan reasonably expected to become a TDR whether on accrual or nonaccrual status and 4) when it is determined by management that a loan does not share similar risk characteristics with other loans. Specific reserves are established based on the following three acceptable methods for measuring the ACL: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral when the loan is collateral dependent. Our individual loan evaluations consist primarily of the fair value of collateral method because most of our loans are collateral dependent. Collateral values are discounted to consider disposition costs when appropriate. A specific reserve is established or a charge-off is taken if the fair value of the loan is less than the loan balance. Our ACL Committee meets quarterly to verify the overall appropriateness of the ACL. Additionally, on an annual basis, the ACL Committee meets to validate our ACL methodology. This validation includes reviewing the loan segmentation, critical model assumptions, forecast and the qualitative framework. As a result of this ongoing monitoring process, we may make changes to our ACL to be responsive to the economic environment. Allowance for Loan Losses Prior to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, we calculated our ALL using an incurred loan loss methodology. Refer to our Annual Report on Form 10-K for the year ended December 31, 2020 for our Allowance for Loan Losses policy. Bank Owned Life Insurance We have purchased life insurance policies on certain executive officers and employees. We receive the cash surrender value of each policy upon its termination or benefits are payable to us upon the death of the insured. Changes in net cash surrender value are recognized in noninterest income in the Consolidated Statements of Net Income. Premises and Equipment Premises and equipment, including leasehold improvements, are s

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2021
Business Combination and Asset Acquisition [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS On November 30, 2019, we completed our acquisition of DNB Financial Corporation, or DNB, and DNB First National Association, its wholly-owned bank subsidiary, located in Downingtown, Pennsylvania. The acquisition of DNB expanded our Eastern Pennsylvania market by adding 14 banking locations, in an all-stock transaction structured as a merger of DNB with and into S&T, with S&T being the surviving entity. The related systems conversion of DNB into S&T Bank occurred on February 7, 2020. DNB shareholders received, without interest, 1.22 shares of S&T common stock for each share of DNB common stock. The total purchase price was approximately $201.0 million, which included $0.4 million of cash and 5,318,964 S&T common shares at a fair value of $37.72 per share. The fair value of $37.72 per share of S&T common stock was based on the November 30, 2019 closing price. The Merger was accounted for under the acquisition method of accounting and our Consolidated Financial Statements include all DNB Bank transactions beginning on December 1, 2019. Goodwill of $86.0 million at December 31, 2020 was calculated as the excess of the consideration exchanged over the fair value of the identifiable net assets acquired. All of the goodwill was assigned to our Community Banking segment. The goodwill recognized is not deductible for tax purposes. Measurement period adjustments were $1.8 million as of November 30, 2020 which reflect facts and circumstances in existence as of the closing date of the acquisition. These measurement period adjustments primarily related to a $2.4 million reduction in the fair value of loans, a $0.3 million reduction in the fair value of borrowings, a $0.1 million reduction of other liabilities, a $0.1 million reduction in other assets and a $0.3 million increase in deferred income tax assets. The accounting for the acquisition was finalized on November 30, 2020. The following table presents the fair value adjustments and the measurement period adjustments as of the dates presented: November 30, 2019 November 30, 2020 As Recorded by DNB Fair Value Adjustments As Recorded by S&T Measurement Period Adjustments As Recorded by S&T Fair Value of Assets Acquired Cash and cash equivalents $ 64,119 $ — $ 64,119 $ — $ 64,119 Securities and other investments 108,715 183 108,898 — 108,898 Loans 917,127 (8,143) 908,984 (2,377) 906,607 Allowance for credit losses (6,487) 6,487 — — — Goodwill 15,525 (15,525) — — — Premises and equipment 6,782 8,090 14,872 — 14,872 Accrued interest receivable 4,138 — 4,138 — 4,138 Deferred income taxes 2,017 (3,298) (1,281) 311 (970) Core deposits and other intangible assets 269 (269) — — — Other assets 24,883 (4,278) 20,605 (116) 20,489 Total Assets Acquired 1,137,088 (16,753) 1,120,335 (2,182) 1,118,153 Fair Value of Liabilities Assumed Deposits 966,263 1,002 967,265 — 967,265 Borrowings 37,617 (276) 37,341 (257) 37,084 Accrued interest payable and other liabilities 11,157 (3,184) 7,973 (122) 7,851 Total Liabilities Assumed 1,015,037 (2,458) 1,012,579 (379) 1,012,200 Total Net Assets Acquired $ 122,051 $ (14,295) $ 107,756 $ (1,803) $ 105,953 Core Deposit Intangible Asset $ 7,288 $ — $ 7,288 Wealth Management Intangible Asset 1,772 — 1,772 Total Fair Value of Net Assets Acquired and Identified $ 116,816 $ (1,803) $ 115,013 Consideration Paid Cash $ 360 $ — $ 360 Common stock 200,631 — 200,631 Fair Value of Total Consideration $ 200,991 $ — $ 200,991 Goodwill $ 84,175 $ 1,803 $ 85,978 Loans acquired in the Merger were recorded at fair value with no carryover of the related ACL from DNB. Determining the fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. The fair value of the loans acquired was estimated at $909.0 million, net of a $10.5 million discount. The discount is accreted to interest income over the remaining contractual life of the loans. During the measurement period ended November 30, 2020, the fair value of acquired loans was reduced by $2.4 million as we finalized our evaluation of the loan portfolio to reflect facts and circumstances in existence as of the acquisition date. As of December 31, 2020, direct costs related to the DNB merger of $13.7 million were recognized and expensed as incurred. During the year ended December 31, 2020, we recognized $2.3 million of merger related expenses including $0.2 million in legal and professional fees, $1.4 million in severance payments and stay-bonuses, $0.4 million for data processing and $0.3 million in other expenses. As of December 31, 2019, we recognized $11.4 million of merger related expenses, including $4.7 million for data processing contract termination and system conversion costs, $2.8 million in legal and professional expenses, $3.4 million in severance payments and $0.5 million in other expenses.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Earnings per share is calculated using both the two-class and the treasury stock methods with the more dilutive method used to determine reported basic and diluted earnings per share. The two-class method was more dilutive in 2021, 2020 and 2019 and was used to determine reported earnings per share. The following table reconciles the numerators and denominators of basic and diluted EPS: Years ended December 31, (dollars in thousands, except share and per share data) 2021 2020 2019 Numerators for Earnings per Common Share—Basic and Diluted: Net income $ 110,343 $ 21,040 $ 98,234 Less: Income allocated to participating shares 492 68 260 Net Income Allocated to Common Shareholders $ 109,851 $ 20,972 $ 97,974 Denominators: Weighted Average Common Shares Outstanding—Basic 39,050,241 39,070,439 34,628,191 Add: Average participating shares outstanding 2,720 2,780 51,287 Denominator for Diluted 39,052,961 39,073,219 34,679,478 Earnings per common share—basic $ 2.81 $ 0.54 $ 2.84 Earnings per common share—diluted $ 2.81 $ 0.53 $ 2.82 Restricted stock considered anti-dilutive excluded from dilutive potential common shares 793 1,242 12,686

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at December 31, 2021 and 2020. Interest rate lock commitments to borrowers were transferred from Level 2 to Level 3 during the year ended December 31, 2020 due to pull-through factors being a significant unobservable input. December 31, 2021 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Debt securities available-for-sale: U.S. Treasury securities $ 95,327 $ — $ — $ 95,327 Obligations of U.S. government corporations and agencies — 70,348 — 70,348 Collateralized mortgage obligations of U.S. government corporations and agencies — 270,294 — 270,294 Residential mortgage-backed securities of U.S. government corporations and agencies — 56,793 — 56,793 Commercial mortgage-backed securities of U.S. government corporations and agencies — 341,300 — 341,300 Corporate obligations — 500 — 500 Obligations of states and political subdivisions — 75,089 — 75,089 Total Debt Securities Available-for-Sale 95,327 814,324 — 909,651 Marketable equity securities 1,061 81 — 1,142 Total Securities 96,388 814,405 — 910,793 Securities held in a deferred compensation plan 10,230 — — 10,230 Derivative financial assets: Interest rate swaps — 33,528 — 33,528 Interest rate lock commitments — — 401 401 Forward sale contracts — — 4 4 Total Assets $ 106,618 $ 847,933 $ 405 $ 954,956 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 33,631 $ — $ 33,631 Total Liabilities $ — $ 33,631 $ — $ 33,631 December 31, 2020 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Debt securities available-for-sale: U.S. Treasury securities $ 10,282 $ — $ — $ 10,282 Obligations of U.S. government corporations and agencies — 82,904 — 82,904 Collateralized mortgage obligations of U.S. government corporations and agencies — 209,296 — 209,296 Residential mortgage-backed securities of U.S. government corporations and agencies — 67,778 — 67,778 Commercial mortgage-backed securities of U.S. government corporations and agencies — 273,681 — 273,681 Corporate obligations — 2,025 — 2,025 Obligations of states and political subdivisions — 124,427 — 124,427 Total Debt Securities Available-for-Sale 10,282 760,111 — 770,393 Marketable equity securities 3,228 72 — 3,300 Total Securities 13,510 760,183 — 773,693 Securities held in a deferred compensation plan 6,794 — — 6,794 Derivative financial assets: Interest rate swaps — 78,319 — 78,319 Interest rate lock commitments — — 2,900 2,900 Total Assets $ 20,304 $ 838,502 $ 2,900 $ 861,706 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 79,033 $ — $ 79,033 Forward sale contracts — 385 — 385 Total Liabilities $ — $ 79,418 $ — $ 79,418 Assets Recorded at Fair Value on a Nonrecurring Basis We may be required to measure certain assets and liabilities at fair value on a nonrecurring basis. Nonrecurring assets are recorded at the lower of cost or fair value in our financial statements. There were no liabilities measured at fair value on a nonrecurring basis at either December 31, 2021 or December 31, 2020. For Level 3 assets measured at fair value on a nonrecurring basis at December 31, 2021 and 2020, the significant unobservable inputs used in the fair value measurements were as follows: December 31, 2021 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (dollars in thousands) Loans individually evaluated $ 16,004 Collateral method Appraisal adjustment 0% - 20% 4.48% Discounted cash flow method Discount rate 10% 19% 10.46% Other real estate owned 1,011 Collateral method Appraisal adjustment 2.53% 2.53% Mortgage servicing rights — Discounted cash flow method NA NA NA Loans held for sale — Collateral method NA NA NA Total Assets $ 17,015 (1) Weighted averages for loans individually evaluated were weighted by loan amounts. (2) Weighted averages for other real estate owned were weighted by OREO balances. December 31, 2020 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans individually evaluated $ 64,286 Collateral method Appraisal adjustment 0% - 12% 7.70% Discounted cash flow method Discount rate —% - —% —% Other real estate owned 600 Collateral method Appraisal adjustment 21.80% 21.80% Mortgage servicing rights 4,976 Discounted cash flow method Discount rate 9.24% - 12.55% 9.42% Constant prepayment rates 8.82% - 14.58% 13.37% Loans held for sale 586 Collateral method NA NA NA Total Assets $ 70,448 (1) Weighted averages for loans individually evaluated were weighted by loan amounts. (2) Weighted averages for other real estate owned were weighted by OREO balances. (3) Weighted averages for mortgage services rights discount rate and prepayment rates were weighted based on note rate tranches. The carrying values and fair values of our financial instruments at December 31, 2021 and 2020 are presented in the following tables: Fair Value Measurements at December 31, 2021 (dollars in thousands) Carrying Value (1) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 922,215 $ 922,215 $ 922,215 $ — $ — Securities 910,793 910,793 96,388 814,405 — Loans held for sale 1,522 1,522 — — 1,522 Portfolio loans, net 6,901,414 6,815,468 — — 6,815,468 Collateral receivable 37,363 37,363 37,363 — — Securities held in a deferred compensation plan 10,230 10,230 10,230 — — Mortgage servicing rights 7,677 7,677 — — 7,677 Interest rate swaps 33,528 33,528 — 33,528 — Interest rate lock commitments 401 401 — — 401 Forward sale contracts 4 4 — — 4 LIABILITIES Deposits $ 7,996,524 $ 7,992,942 $ 6,908,453 $ 1,084,489 — Securities sold under repurchase agreements 84,491 84,491 84,491 — — Short-term borrowings — — — — — Long-term borrowings 22,430 22,678 4,300 18,378 — Junior subordinated debt securities 54,393 54,393 54,393 — — Interest rate swaps 33,631 33,631 — 33,631 — (1) As reported in the Consolidated Balance Sheets Fair Value Measurements at December 31, 2020 (dollars in thousands) Carrying Value (1) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 229,666 $ 229,666 $ 229,666 $ — $ — Securities 773,693 773,693 13,510 760,183 — Loans held for sale 18,528 18,528 — — 18,528 Portfolio loans, net 7,108,248 7,028,446 — — 7,028,446 Securities held in a deferred compensation plan 77,936 77,936 77,936 — — Mortgage servicing rights 6,794 6,794 6,794 — — Interest rate swaps 4,976 4,976 — — 4,976 Interest rate lock commitments 78,319 78,319 — 78,319 — Forward sale contracts 2,900 2,900 — — 2,900 LIABILITIES Deposits $ 7,420,538 $ 7,422,894 $ 6,033,075 $ 1,389,819 $ — Securities sold under repurchase agreements 65,163 65,163 65,163 — — Short-term borrowings 75,000 75,000 75,000 — — Long-term borrowings 23,681 24,545 4,494 20,051 — Junior subordinated debt securities 64,083 64,083 64,083 — — Interest rate swaps 79,033 79,033 — 79,033 — Forward sale contracts 385 385 — 385 — (1) As reported in the Consolidated Balance Sheets

Restrictions on Cash and Due fr

Restrictions on Cash and Due from Bank Accounts	12 Months Ended
	Dec. 31, 2021
Cash and Cash Equivalents [Abstract]
RESTRICTIONS ON CASH AND DUE FROM BANK ACCOUNTS	RESTRICTIONS ON CASH AND DUE FROM BANK ACCOUNTSThe Board of Governors of the Federal Reserve System, or the Federal Reserve, imposes certain reserve requirements on all depository institutions. These reserves are maintained in the form of vault cash or as an interest-bearing balance with the Federal Reserve. The required reserves averaged $0.0 million for 2021, $15.5 million for 2020 and $43.9 million for 2019. The decrease in the required reserve average from 2020 to 2021 was due to the Federal Reserve reducing the reserve requirement ratio to zero percent effective March 26, 2020.

Dividend and Loan Restrictions

Dividend and Loan Restrictions	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
DIVIDEND AND LOAN RESTRICTIONS	DIVIDEND AND LOAN RESTRICTIONS S&T is a legal entity separate and distinct from its banking and other subsidiaries. A substantial portion of our revenues consist of dividend payments we receive from S&T Bank. S&T Bank, in turn, is subject to state laws and regulations that limit the amount of dividends it can pay to us. In addition, both S&T and S&T Bank are subject to various general regulatory policies relating to the payment of dividends, including requirements to maintain adequate capital above regulatory minimums. The Federal Reserve has indicated that banking organizations should generally pay dividends only if (i) the organization’s net income available to common shareholders over the past year has been sufficient to fully fund the dividends and (ii) the prospective rate of earnings retention appears consistent with the organization’s capital needs, asset quality and overall financial condition. In connection with our reduced net income in 2020 and our inability to fully fund the dividend from earnings over the prior year, due in substantial part to the customer fraud that occurred in the second quarter of 2020, we received non-objection letters from the Federal Reserve to continue to pay our dividends declared in the third and fourth quarter of 2020 and the first and second quarter of 2021. Thus, under certain circumstances based upon our financial condition, our ability to declare and pay quarterly dividends may require consultation with the Federal Reserve and may be prohibited by applicable Federal Reserve Board guidance. Federal law prohibits us from borrowing from S&T Bank unless such loans are collateralized by specific obligations. Further, such loans are limited to 10 percent of S&T Bank’s capital stock and surplus.

Securities

Securities	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The following table presents the fair values of our securities portfolio at the dates presented: December 31, (dollars in thousands) 2021 2020 Debt securities available-for-sale $ 909,651 $ 770,393 Marketable equity securities 1,142 3,300 Total Securities $ 910,793 $ 773,693 Debt Securities Available-for-Sale The following tables present the amortized cost and fair value of debt securities available-for-sale as of December 31, 2021 and December 31, 2020: December 31, 2021 December 31, 2020 (dollars in thousands) Amortized Gross Gross Fair Value Amortized Gross Gross Fair Value U.S. Treasury securities $ 95,954 $ 115 $ (742) $ 95,327 $ 9,980 $ 302 $ — $ 10,282 Obligations of U.S. government corporations and agencies 68,599 1,749 — 70,348 78,755 4,149 — 82,904 Collateralized mortgage obligations of U.S. government corporations and agencies 270,696 2,408 (2,810) 270,294 202,975 6,410 (89) 209,296 Residential mortgage-backed securities of U.S. government corporations and agencies 57,029 392 (628) 56,793 66,960 818 — 67,778 Commercial mortgage-backed securities of U.S. government corporations and agencies 336,918 5,969 (1,587) 341,300 258,875 14,806 — 273,681 Corporate Obligations 500 — — 500 2,021 5 (1) 2,025 Obligations of states and political subdivisions 70,539 4,550 — 75,089 117,439 6,988 — 124,427 Total Debt Securities Available-for-Sale $ 900,235 $ 15,183 $ (5,767) $ 909,651 $ 737,005 $ 33,478 $ (90) $ 770,393 The following table shows the composition of gross and net realized gains and losses for the periods presented: Years ended December 31, (dollars in thousands) 2021 2020 2019 Gross realized gains $ 29 $ 219 $ 41 Gross realized losses — (77) (67) Net Realized Gains/(Losses) $ 29 $ 142 $ (26) The following tables present the fair value and the age of gross unrealized losses on debt securities available-for-sale by investment category as of the dates presented: December 31, 2021 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number Fair Unrealized Number Fair Unrealized Number Fair Unrealized U.S. Treasury securities 8 $ 85,221 $ (742) — $ — $ — 8 $ 85,221 $ (742) Collateralized mortgage obligations of U.S. government corporations and agencies 12 141,204 (2,436) 1 8,933 (374) 13 150,137 (2,810) Residential mortgage-backed securities of U.S. government corporations and agencies 3 46,042 (628) — — — 3 46,042 (628) Commercial mortgage-backed securities of U.S. government corporations and agencies 7 100,032 (1,587) — — — 7 100,032 (1,587) Corporate Obligations — — — — — — — — — Total 30 $ 372,499 $ (5,393) 1 $ 8,933 $ (374) 31 $ 381,432 $ (5,767) December 31, 2020 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number Fair Unrealized Number Fair Unrealized Number Fair Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Collateralized mortgage obligations of U.S. government corporations and agencies 2 35,697 (89) — — — 2 35,697 (89) Residential mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Commercial mortgage-backed securities of U.S. government corporations and agencies — — — — — — Corporate Obligations 1 499 (1) — — — 1 499 (1) Total 3 $ 36,196 $ (90) — $ — $ — 3 $ 36,196 $ (90) We evaluate securities with unrealized losses quarterly to determine if the decline in fair value has resulted from credit loss or other factors. We do not believe any individual unrealized loss as of December 31, 2021 represents an impairment. At December 31, 2021, there were 31 debt securities and at December 31, 2020 there were 3 debt securities in an unrealized loss position. The unrealized losses on debt securities were primarily attributable to changes in interest rates and not related to the credit quality of the issuers. All debt securities are determined to be investment grade and paying principal and interest according to the contractual terms of the security. We do not intend to sell and it is more likely than not that we will not be required to sell any of the securities in an unrealized loss position before recovery of their amortized cost. We concluded that the ACL for debt securities was immaterial at December 31, 2021. Prior to the adoption of ASU 2016-13 there was no other than temporary impairment, or OTTI, recorded during the year ended December 31, 2020. The following table presents net unrealized gains and losses, net of tax, on debt securities available-for-sale included in accumulated other comprehensive income/(loss), for the periods presented: December 31, 2021 December 31, 2020 (dollars in thousands) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains (Losses) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains (Losses) Total unrealized gains/(losses) on debt securities available-for-sale $ 15,183 $ (5,767) $ 9,416 $ 33,478 $ (90) $ 33,388 Income tax (expense) benefit (3,215) 1,221 (1,994) (7,128) 19 (7,109) Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss) $ 11,968 $ (4,546) $ 7,422 $ 26,350 $ (71) $ 26,279 The amortized cost and fair value of debt securities available-for-sale at December 31, 2021 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. December 31, 2021 (dollars in thousands) Amortized Fair Value Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions Due in one year or less $ 43,513 $ 44,027 Due after one year through five years 63,849 66,363 Due after five years through ten years 106,881 107,427 Due after ten years 20,849 22,947 Debt Securities Available-for-Sale With Maturities 235,092 240,764 Collateralized mortgage obligations of U.S. government corporations and agencies 270,696 270,294 Residential mortgage-backed securities of U.S. government corporations and agencies 57,029 56,793 Commercial mortgage-backed securities of U.S. government corporations and agencies 336,918 341,300 Corporate Obligations 500 500 Total Debt Securities Available-for-Sale $ 900,235 $ 909,651 At December 31, 2021 and 2020, debt securities with carrying values of $466.9 million and $308.3 million were pledged for various regulatory and legal requirements. Marketable Equity Securities The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented: Years ended December 31, (dollars in thousands) 2021 2020 2019 Marketable Equity Securities Net market gains (losses) recognized $ 189 $ (500) $ 334 Less: Net gains recognized for equity securities sold 29 142 — Unrealized Gains (Losses) on Equity Securities Still Held $ 160 $ (642) $ 334

Loans and Loans Held for Sale

Loans and Loans Held for Sale	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
LOANS AND LOANS HELD FOR SALE	LOANS AND LOANS HELD FOR SALE Loans are presented net of unearned income of $14.1 million and $16.0 million at December 31, 2021 and 2020 and net of a discount related to purchase accounting fair value adjustments of $6.7 million and $8.6 million at December 31, 2021 and December 31, 2020. The following table summarizes the composition of originated and acquired loans as of the dates presented: (dollars in thousands) December 31, 2021 December 31, 2020 Commercial Commercial real estate $ 3,236,653 $ 3,244,974 Commercial and industrial 1,728,969 1,954,453 Commercial construction 440,962 474,280 Total Commercial Loans 5,406,584 5,673,707 Consumer Consumer real estate 1,485,478 1,471,238 Installment and other consumer 107,928 80,915 Total Consumer Loans 1,593,406 1,552,153 Total Portfolio Loans 6,999,990 7,225,860 Loans held for sale 1,522 18,528 Total Loans (1) $ 7,001,512 $ 7,244,388 (1) Excludes interest receivable of $18.7 million at December 31, 2021 and $24.7 million at December 31, 2020. Interest receivable is included in other assets in the Consolidated Balance Sheets. Commercial and industrial loans, or C&I, included $88.3 million of loans originated under the Paycheck Protection Program, or PPP, at December 31, 2021 compared to $465.0 million at December 31, 2020. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security, or CARES Act was signed into law. The CARES Act included the PPP, a program designed to aid small and medium sized businesses through federally guaranteed loans distributed through banks. PPP loans are forgivable, in whole or in part, if the proceeds are used for payroll and other permitted expenses in accordance with the requirements of the PPP. The loans are 100 percent guaranteed by the Small Business Administration, or SBA. These loans carry a fixed rate of 1.00 percent and a term of two years, or five years for loans approved by the SBA, on or after June 5, 2020. Payments are deferred for at least six months of the loan. The SBA pays us a processing fee ranging from 1 percent to 5 percent based on the size of the loan. Interest is accrued as earned and loan origination fees and direct costs are deferred and accreted or amortized into interest income over the life of the loan using the level yield method. When a PPP loan is paid off or forgiven by the SBA, the remaining unaccreted or unamortized net origination fees or costs will be immediately recognized into income. At December 31, 2021, our business banking segment was $1.1 billion compared to $1.2 billion at December 31, 2020. Business banking consists of commercial loans made to small businesses that are standard, non-complex products evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards that meet small business market customers’ needs. Business banking consisted of $546.1 million of commercial real estate loans, $215.4 million of C&I loans of which $39.7 million are PPP loans, $16.2 million of commercial construction loans and $357.9 million of consumer real estate loans at December 31, 2021. At December 31, 2020 business banking consisted of $453.0 million of commercial real estate loans, $394.9 million of C&I loans of which $178.4 million are PPP Loans, $8.2 million of commercial construction loans and $303.9 million of consumer real estate loans that have a commercial purpose. We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, geography, collateral and industry and actively managing concentrations. When concentrations exist in certain segments, we mitigate this risk by reviewing the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments. Total commercial loans represented 77.2 percent of total portfolio loans at December 31, 2021 and 78.5 percent at December 31, 2020. Within our commercial portfolio, the CRE and Commercial Construction portfolios combined comprised $3.7 billion or 68.0 percent of total commercial loans and 52.5 percent of total portfolio loans at December 31, 2021 and comprised $3.7 billion or 65.6 percent of total commercial loans and 51.5 percent of total portfolio loans at December 31, 2020. We lend primarily in Pennsylvania and the contiguous states of Ohio, New York, West Virginia and Maryland. The majority of our commercial and consumer loans are made to businesses and individuals in this geography, resulting in a concentration. We believe our knowledge and familiarity with customers and conditions locally outweighs this geographic concentration risk. The conditions of the local and regional economies are monitored closely through publicly available data and information supplied by our customers. We also use subscription services for additional geographic and industry specific information. Our CRE and Commercial Construction portfolios have exposure outside this geography of 5.7 percent of the combined portfolios at December 31, 2021 and 5.9 percent at December 31, 2020. Exposure of total portfolio loans was 3.0 percent at December 31, 2021and December 31, 2020. The following table summarizes our restructured loans as of the dates presented: December 31, 2021 December 31, 2020 (dollars in thousands) Performing Nonperforming Total Performing Nonperforming Total Commercial real estate $ — $ 1,697 $ 1,697 $ 14 $ 16,654 $ 16,668 Commercial and industrial 748 14,889 15,637 7,090 9,885 16,975 Commercial construction 2,190 2,087 4,277 3,267 — 3,267 Business banking 858 1,696 2,554 1,503 430 1,933 Consumer real estate 6,122 1,405 7,527 5,581 2,319 7,900 Other consumer 3 — 3 5 — 5 Total $ 9,921 $ 21,774 $ 31,695 $ 17,460 $ 29,289 $ 46,748 The following tables present the restructured loans by loan segment and by type of concession for the years ended: December 31, 2021 Number Type of Modification Total Post-Modification Outstanding Recorded Investment (2) Total Pre-Modification Outstanding Recorded Investment (2) (dollars in thousands) Bankruptcy (1) Other Extend Modify Modify Commercial real estate 1 $ — $ — $ — $ — $ 1,300 $ 1,300 $ 1,824 Commercial industrial 3 — — 2,039 — 9,182 11,221 21,297 Commercial construction 1 — — 2,087 — — 2,087 5,279 Business banking 9 8 — 558 — 1,155 1,721 1,792 Consumer real estate 26 1,099 — — — 147 1,246 1,280 Other consumer — — — — — — — — Total 40 $ 1,107 $ — $ 4,684 $ — $ 11,784 $ 17,575 $ 31,472 (1) Bankruptcy is consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (2) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. December 31, 2020 Number Type of Modification Total Post-Modification Outstanding Recorded Investment (2) Total Pre-Modification Outstanding Recorded Investment (2) (dollars in thousands) Bankruptcy (1) Other Extend Modify Modify Commercial real estate 1 $ — $ — $ — $ — $ 4,791 $ 4,791 $ 5,292 Commercial industrial 3 — — 13,339 — 281 13,620 15,217 Commercial construction 3 — — 2,330 — — 2,330 2,592 Business banking 3 — — 165 — 95 260 501 Consumer real estate 29 956 — 690 — — 1,646 1,688 Other consumer 1 4 — — — — 4 5 Total 40 $ 960 $ — $ 16,524 $ — $ 5,167 $ 22,651 $ 25,295 (1) Bankruptcy is consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (2) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. In response to the coronavirus, or COVID-19 pandemic, and its economic impact on our customers, we implemented a short-term modification program that complies with the CARES Act to provide temporary payment relief to those borrowers directly impacted by COVID-19 pandemic who were not more than 30 days past due as of December 31, 2019. This program allows for a deferral of payments for 90 days and up to a maximum of 180 days for our commercial customers. The customer remains responsible for deferred payments along with any additional interest accrued during the deferral period. For our consumer customers, interest does not accrue during the deferral period and the maturity date is extended by the length of the deferral period. Under the applicable guidance, none of these loans were considered restructured during 2021. We had eight loans that were modified totaling $28.8 million at December 31, 2021 compared to 52 loans that were modified totaling $195.6 million at December 31, 2020. We had 12 commitments for $2.6 million to lend additional funds on TDRs at December 31, 2021 compared to 20 commitments for $0.8 million at December 31, 2020. We had no TDR's that returned to accruing status during 2021. We returned one TDR totaling $0.1 million to accruing status during 2020. Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place that were restructured within the last 12 months prior to defaulting. There were no TDRs that defaulted during the year ended December 31, 2021 and there were six TDRs totaling $11.8 million that defaulted during the year ended 2020. The following table is a summary of nonperforming assets as of the dates presented: December 31, (dollars in thousands) 2021 2020 Nonperforming Assets Nonaccrual loans $ 44,517 $ 117,485 Nonaccrual TDRs 21,774 29,289 Total nonaccrual loans 66,291 146,774 OREO 13,313 2,155 Total Nonperforming Assets $ 79,604 $ 148,929 The following table presents a summary of the aggregate amount of loans to certain officers, directors of S&T or any affiliates of such persons as of December 31: 2021 2020 Balance at beginning of year $ 6,329 $ 8,225 New loans 1,826 3,343 Repayments or no longer considered a related party (1,998) (5,239) Balance at end of year $ 6,157 $ 6,329

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
ALLOWANCE FOR CREDIT LOSSES	ALLOWANCE FOR CREDIT LOSSES We maintain an ACL at a level determined to be adequate to absorb estimated expected credit losses within the loan portfolio over the contractual life of an instrument that considers our historical loss experience, current conditions and forecasts of future economic conditions as of the balance sheet date. We develop and document a systematic ACL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. The following are key risks within each portfolio segment: CRE —Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, retail, multifamily and health care. The primary sources of repayment for these loans are the operations of the individual projects and global cash flows of the debtors. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied. C&I —Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. The primary source of repayment for these loans is cash flow from the operations of the company. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often does not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt. Commercial Construction —Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer. Business Banking —Commercial loans made to small businesses that are standard, non-complex products evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards that meet small business market customers’ needs. The business banking portfolio is monitored by utilizing a standard and closely managed process focusing on behavioral and performance criteria. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and business. Consumer Real Estate —Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt. Other Consumer —Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values. Management monitors various credit quality indicators for the commercial, business banking and consumer loan portfolios, including changes in risk ratings, nonperforming status and delinquency on a monthly basis. We monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard. Our risk ratings are consistent with regulatory guidance and are as follows: Pass —The loan is currently performing and is of high quality. Special Mention —A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Substandard —A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Doubtful —Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions, and values, highly questionable and improbable. The following tables present loan balances by year of origination and internally assigned risk rating for our portfolio segments as of the dates presented: December 31, 2021 Risk Rating (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 385,347 $ 316,003 $ 412,191 $ 314,303 $ 213,019 $ 698,992 $ 35,448 — $ 2,375,303 Special Mention — — 37,786 6,401 40,445 75,938 — — 160,570 Substandard — 1,356 18,743 14,039 12,555 106,461 1,500 — 154,654 Doubtful — — — — — — — — — Total Commercial Real Estate 385,347 317,359 468,720 334,743 266,019 881,391 36,948 — 2,690,528 Commercial and Industrial Pass 437,483 126,371 115,359 83,030 37,176 132,182 536,554 — 1,468,155 Special Mention 46 — 3,060 2,546 72 832 8,887 — 15,443 Substandard — — 14,221 1,336 4,174 3,456 4,961 — 28,148 Doubtful — — 1,777 — — — — — 1,777 Total Commercial and Industrial 437,529 126,371 134,417 86,912 41,422 136,470 550,402 — 1,513,523 Commercial Construction Pass 142,321 108,405 111,512 16,838 989 3,539 30,036 — 413,640 Special Mention — — — — — 4,458 — — 4,458 Substandard — 2,157 2,020 — — 2,480 — — 6,657 Doubtful — — — — — — — — — Total Commercial Construction 142,321 110,562 113,532 16,838 989 10,477 30,036 — 424,755 Business Banking Pass 257,264 107,791 141,411 110,586 79,187 293,215 107,093 443 1,096,990 Special Mention 104 151 1,986 1,365 1,057 5,929 160 111 10,863 Substandard 41 106 1,579 3,277 1,645 19,591 977 625 27,841 Doubtful — — — — — — — — — Total Business Banking 257,409 108,048 144,976 115,228 81,889 318,735 108,230 1,179 1,135,693 Consumer Real Estate Pass 137,465 100,995 91,981 48,531 39,029 231,861 442,530 23,391 1,115,783 Special Mention — — — — — 937 — — 937 Substandard — — 184 1,625 1,355 5,664 876 1,161 10,865 Doubtful — — — — — — — — — Total Consumer Real Estate 137,465 100,995 92,165 50,156 40,384 238,462 443,406 24,552 1,127,585 Other consumer Pass 19,976 9,396 7,120 2,878 613 2,037 57,702 1,130 100,852 Special Mention — — — — — — — — — Substandard 83 52 141 215 408 4,407 201 1,547 7,054 Doubtful — — — — — — — — — Total Other Consumer 20,059 9,448 7,261 3,093 1,021 6,444 57,903 2,677 107,906 Total Loan Balance $ 1,380,130 $ 772,783 $ 961,071 $ 606,970 $ 431,724 $ 1,591,979 $ 1,226,925 $ 28,408 $ 6,999,990 December 31, 2020 Risk Rating (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 334,086 $ 422,800 $ 394,963 $ 277,724 $ 307,321 $ 615,217 $ 46,330 — $ 2,398,441 Special Mention — 35,499 10,200 22,502 55,174 75,022 — — 198,397 Substandard — 17,259 12,781 19,914 50,700 83,792 1,500 — 185,946 Doubtful — 645 — — 1,989 6,529 — — 9,163 Total Commercial Real Estate 334,086 476,203 417,944 320,140 415,184 780,560 47,830 — 2,791,947 Commercial and Industrial Pass 454,131 199,453 140,049 68,607 27,645 206,782 383,082 — 1,479,749 Special Mention 3,697 8,211 2,628 697 768 1,046 23,527 — 40,574 Substandard — 7,793 2,613 8,544 75 13,781 2,022 — 34,828 Doubtful — — — 4,401 — — — — 4,401 Total Commercial and Industrial 457,828 215,457 145,290 82,249 28,488 221,609 408,631 — 1,559,552 Commercial Construction Pass 131,235 224,794 59,649 2,420 6,346 4,555 12,778 — 441,777 Special Mention 1,578 2,533 3,886 — — 8,593 — — 16,590 Substandard — 3,580 — 501 — 3,629 — — 7,710 Doubtful — — — — — — — — — Total Commercial Construction 132,813 230,907 63,535 2,921 6,346 16,777 12,778 — 466,077 Business Banking Pass 296,254 154,335 123,207 86,552 77,238 266,042 103,571 291 1,107,490 Special Mention — 1,060 1,147 1,602 1,084 6,866 637 123 12,519 Substandard 103 1,078 3,896 3,209 3,880 25,871 1,341 680 40,058 Doubtful — — — — — — — — — Total Business Banking 296,357 156,473 128,250 91,363 82,202 298,779 105,549 1,094 1,160,067 Consumer Real Estate Pass 120,736 122,171 67,700 63,653 73,805 243,939 438,888 22,667 1,153,559 Special Mention — — 1,489 — — 150 132 — 1,771 Substandard — 373 742 1,480 2,449 6,958 — — 12,002 Doubtful — — — — — — — — — Total Consumer Real Estate 120,736 122,544 69,931 65,133 76,254 251,047 439,020 22,667 1,167,332 Other consumer Pass 18,849 13,162 6,784 3,395 2,082 687 26,647 2,767 74,373 Special Mention — — — — — — — — — Substandard 15 — — — — 3,367 744 2,386 6,512 Doubtful — — — — — — — — — Total Other Consumer 18,864 13,162 6,784 3,395 2,082 4,054 27,391 5,153 80,885 Total Loan Balance $ 1,360,684 $ 1,214,746 $ 831,734 $ 565,201 $ 610,556 $ 1,572,826 $ 1,041,199 $ 28,914 $ 7,225,860 We monitor the delinquent status of the commercial and consumer portfolios on a monthly basis. Loans are considered nonperforming when interest and principal are 90 days or more past due or management has determined that a material deterioration in the borrower’s financial condition exists. The risk of loss is generally highest for nonperforming loans. The following tables present loan balances by year of origination and performing and nonperforming status for our portfolio segments as of the dates presented: December 31, 2021 (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial Real Estate Performing $ 385,347 $ 317,359 $ 461,613 $ 332,482 $ 259,723 $ 865,567 $ 36,948 $ — $ 2,659,039 Nonperforming — 7,107 2,261 6,296 15,824 — — 31,488 Total Commercial Real Estate 385,347 317,359 468,720 334,743 266,019 881,391 36,948 — 2,690,528 Commercial and Industrial Performing 437,529 126,371 123,944 86,852 38,540 136,427 548,622 — 1,498,285 Nonperforming — — 10,473 60 2,882 43 1,780 — 15,239 Total Commercial and Industrial 437,529 126,371 134,417 86,912 41,422 136,470 550,402 — 1,513,523 Commercial Construction Performing 142,321 110,562 111,445 16,838 989 10,093 30,036 — 422,284 Nonperforming — — 2,087 — — 384 — — 2,471 Total Commercial Construction 142,321 110,562 113,532 16,838 989 10,477 30,036 — 424,755 Business Banking Performing 257,368 107,984 144,689 113,820 81,195 311,673 108,202 1,122 1,126,052 Nonperforming 41 64 287 1,408 694 7,062 28 57 9,641 Total Business Banking 257,409 108,048 144,976 115,228 81,889 318,735 108,230 1,179 1,135,693 Consumer Real Estate Performing 137,465 100,253 91,689 49,853 39,657 234,297 443,238 23,839 1,120,291 Nonperforming — 742 476 303 727 4,165 168 713 7,294 Total Consumer Real Estate 137,465 100,995 92,165 50,156 40,384 238,462 443,406 24,552 1,127,585 Other Consumer Performing 20,059 9,290 7,261 3,093 1,021 6,444 57,903 2,677 107,748 Nonperforming — 158 — — — — — — 158 Total Other Consumer 20,059 9,448 7,261 3,093 1,021 6,444 57,903 2,677 107,906 Performing 1,380,089 771,819 940,641 602,938 421,125 1,564,501 1,224,949 27,638 6,933,699 Nonperforming 41 964 20,430 4,032 10,599 27,478 1,976 770 66,291 Total Loan Balance $ 1,380,130 $ 772,783 $ 961,071 $ 606,970 $ 431,724 $ 1,591,979 $ 1,226,925 $ 28,408 $ 6,999,990 December 31, 2020 (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Performing $ 334,086 $ 459,799 $ 417,944 $ 313,465 $ 394,972 $ 722,782 $ 47,830 $ — $ 2,690,879 Nonperforming — 16,404 — 6,675 20,212 57,778 — — 101,070 Total Commercial Real Estate 334,086 476,203 417,944 320,140 415,184 780,560 47,830 — 2,791,947 Commercial and Industrial Performing 457,828 214,144 143,706 69,411 28,426 220,701 408,350 — 1,542,566 Nonperforming — 1,313 1,584 12,838 62 908 281 — 16,985 Total Commercial and Industrial 457,828 215,457 145,290 82,249 28,488 221,609 408,631 — 1,559,552 Commercial Construction Performing 132,813 230,907 63,535 2,921 6,346 16,393 12,778 — 465,692 Nonperforming — — — — — 384 — — 384 Total Commercial Construction 132,813 230,907 63,535 2,921 6,346 16,777 12,778 — 466,077 Business Banking Performing 296,327 156,164 126,432 90,414 80,106 286,970 105,494 1,037 1,142,944 Nonperforming 30 309 1,818 949 2,096 11,809 55 57 17,123 Total Business Banking 296,357 156,473 128,250 91,363 82,202 298,779 105,549 1,094 1,160,067 Consumer Real Estate Performing 120,736 122,315 69,225 63,647 74,690 245,331 438,702 21,572 1,156,216 Nonperforming — 229 706 1,486 1,564 5,716 318 1,096 11,116 Total Consumer Real Estate 120,736 122,544 69,931 65,133 76,254 251,047 439,020 22,667 1,167,332 Other Consumer Performing 18,864 13,162 6,784 3,395 2,082 3,958 27,391 5,153 80,789 Nonperforming — — — — — 96 — — 96 Total Other Consumer 18,864 13,162 6,784 3,395 2,082 4,054 27,391 5,153 80,885 Performing 1,360,654 1,196,491 827,625 543,253 586,622 1,496,135 1,040,544 27,762 7,079,086 Nonperforming 30 18,254 4,108 21,948 23,934 76,691 654 1,153 146,774 Total Loan Balance $ 1,360,684 $ 1,214,746 $ 831,734 $ 565,201 $ 610,556 $ 1,572,826 $ 1,041,199 $ 28,914 $ 7,225,860 The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented: December 31, 2021 (1) (dollars in thousands) Current 30-59 Days 60-89 Days Non- Total Total Loans Commercial real estate $ 2,659,040 $ — $ — $ 31,488 $ 31,488 $ 2,690,528 Commercial and industrial 1,497,755 529 — 15,239 15,768 1,513,523 Commercial construction 421,834 450 — 2,471 2,921 424,755 Business banking 1,124,748 813 491 9,641 10,945 1,135,693 Consumer real estate 1,117,073 1,087 2,130 7,294 10,512 1,127,585 Other consumer 107,492 206 50 158 414 107,906 Total $ 6,927,943 $ 3,085 $ 2,672 $ 66,291 $ 72,048 $ 6,999,990 (1) We had 8 loans that were modified totaling $28.8 million under the CARES Act at December 31, 2021 compared to 52 loans that were modified totaling $195.6 million at December 31, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans. December 31, 2020 (2) (dollars in thousands) Current 30-59 Days 60-89 Days 90 Days + Past Due (1) Non- Total Total Loans Commercial real estate $ 2,690,877 $ — $ — $ — $ 101,070 $ 101,070 $ 2,791,947 Commercial and industrial 1,542,567 — — — 16,985 16,985 1,559,552 Commercial construction 462,094 19 3,580 — 384 3,983 466,077 Business banking 1,140,581 1,614 379 371 17,122 19,486 1,160,067 Consumer real estate 1,153,028 1,087 1,968 132 11,117 14,304 1,167,332 Other consumer 80,583 168 37 — 96 302 80,885 Total $ 7,069,730 $ 2,888 $ 5,965 $ 503 $ 146,774 $ 156,130 $ 7,225,860 (1) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at December 31, 2020. (2) We had 52 loans that were modified totaling $195.6 million at December 31, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans. The following tables present loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: December 31, 2021 December 31, 2021 For the twelve months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 101,070 $ 31,488 $ 28,046 $ 158 Commercial and industrial 16,985 15,239 5,707 74 Commercial construction 384 2,471 2,020 (28) Business banking 17,122 9,641 1,696 427 Consumer real estate 11,117 7,294 — 496 Other consumer 96 158 — 1 Total $ 146,774 $ 66,291 $ 37,469 $ 1,128 (1) Represents only cash payments received and applied to interest on nonaccrual loans. December 31, 2020 December 31, 2020 For the twelve months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Past Due 90+ Days Still Accruing Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 25,356 $ 101,070 $ 60,401 $ — $ 22 Commercial and industrial 10,911 16,985 6,436 — 101 Commercial construction 737 384 285 — — Business banking 9,863 17,122 3,890 371 275 Consumer real estate 6,063 11,117 398 132 423 Other consumer 1,127 96 — — 4 Total $ 54,057 $ 146,774 $ 71,410 $ 503 $ 826 (1) Represents only cash payments received and applied to interest on nonaccrual loans. The following tables present collateral-dependent loans by class of loan: December 31, 2021 Type of Collateral (dollars in thousands) Real Estate Blanket Lien Investment/Cash Other Commercial real estate $ 28,046 $ — $ — $ — Commercial and industrial 259 4,905 — 10,473 Commercial construction 4,210 — — — Business banking 910 1,636 — — Consumer real estate 1,031 — — — Total $ 34,456 $ 6,541 $ — $ 10,473 December 31, 2020 Type of Collateral (dollars in thousands) Real Estate Blanket Lien Investment/Cash Other Commercial real estate $ 100,450 $ — $ — $ — Commercial and industrial 1,040 15,080 — — Commercial construction 3,552 — — — Business banking 3,085 1,619 — 689 Consumer real estate 398 — — — Total $ 108,525 $ 16,699 $ — $ 689 The following tables present activity in the ACL for years ended: Twelve Months Ended December 31, 2021 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 65,656 $ 16,100 $ 7,239 $ 15,917 $ 10,014 $ 2,686 $ 117,612 Provision for credit losses on loans (2) (2,569) 23,746 (1,842) (3,159) (1,020) 338 15,494 Charge-offs (13,444) (20,923) (56) (1,580) (569) (952) (37,524) Recoveries 1,057 804 14 160 308 651 2,994 Net (Charge-offs)/Recoveries (12,387) (20,119) (42) (1,420) (261) (301) (34,530) Balance at End of Period $ 50,700 $ 19,727 $ 5,355 $ 11,338 $ 8,733 $ 2,723 $ 98,576 Twelve Months Ended December 31, 2020 (dollars in thousands) Commercial Commercial and Industrial (1) Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 30,577 $ 15,681 $ 7,900 $ — $ 6,337 $ 1,729 $ 62,224 Impact of CECL adoption 4,810 7,853 (3,376) 12,898 4,525 636 27,346 Provision for credit losses on loans (2) 56,489 65,288 2,986 5,303 (368) 1,723 131,421 Charge-offs (26,460) (74,282) (454) (2,612) (667) (1,890) (106,365) Recoveries 240 1,560 183 328 187 488 2,986 Net (Charge-offs)/Recoveries (26,220) (72,722) (271) (2,284) (480) (1,402) (103,379) Balance at End of Period $ 65,656 $ 16,100 $ 7,239 $ 15,917 $ 10,014 $ 2,686 $ 117,612 (1) During the three months ended June 30, 2020, we experienced a pre-tax loss of $58.7 million related to a customer fraud resulting from a check kiting scheme. (2) Excludes the provision for credit losses for unfunded commitments. The provision for credit losses, which includes a provision for losses on loans and on unfunded loan commitments, is a charge to earnings to maintain the ACL at a level consistent with management's assessment of expected losses in the loan portfolio at the balance sheet date. The provision for credit losses decreased $115.9 million to $15.5 million for 2021 compared to $131.4 million for 2020. The significant decrease in the provision for credit losses during 2021 was mainly due to the customer fraud in 2020 and an improved outlook for the economy and our loan portfolio. The C&I portfolio included $88.3 million of loans originated under the PPP at December 31, 2021 compared to $465.0 million at December 31, 2020. The loans are 100 percent guaranteed by the SBA, therefore, we have not assigned any ACL to these loans at December 31, 2021.

Right-Of-Use Assets and Lease L

Right-Of-Use Assets and Lease Liabilities	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
RIGHT-OF-USE ASSETS AND LEASE LIABILITIES	RIGHT-OF-USE ASSETS AND LEASE LIABILITIES We have 48 lease contracts, including 45 operating leases and three finance leases at December 31, 2021. These leases are for our branch, loan production and support services facilities. Included in the lease expense for premises are leases with one S&T director, which totaled approximately $0.2 million for each of the three years 2021, 2020 and 2019. The following table presents our lease expense for finance and operating leases for the years ended December 31: (dollars in thousands) 2021 2020 2019 Operating lease expense (1) $ 5,135 $ 5,711 $ 4,221 Amortization of ROU assets - finance leases (1) 224 224 101 Interest on lease liabilities - finance leases (2) 74 84 74 Total Lease Expense $ 5,433 $ 6,019 $ 4,396 (1) Included in occupancy expense in our Consolidated Statements of Net Income. (2) Included in borrowings interest expense in our Consolidated Statements of Net Income. The following table presents our ROU assets, weighted average term and the discount rates for finance and operating leases as of December 31: (dollars in thousands) 2021 2020 Operating Leases ROU assets $ 44,067 $ 46,245 Operating cash flows $ 6,570 $ 6,489 Finance Leases ROU assets $ 1,055 $ 1,278 Operating cash flows $ 74 $ 84 Financing cash flows $ 194 $ 180 Weighted Average Lease Term - Years Operating leases 18.9 18.7 Finance leases 12.4 12.1 Weighted Average Discount Rate Operating leases 5.82 % 5.90 % Finance leases 5.91 % 5.81 % During 2021, we entered into one new operating lease increasing the right-of-use asset and the related liability values by $3.0 million. During 2020, two operating leases were considered abandoned due to branch closures and the right-of-use asset values were reduced by $0.5 million to zero and the related liabilities were reduced by $0.2 million. We recognized additional expense of $0.3 million at the date of abandonment for these leases. The following table presents the maturity analysis of lease liabilities for finance and operating leases as of December 31, 2021: (dollars in thousands) Maturity Analysis Finance Operating Total 2022 $ 225 $ 4,707 $ 4,932 2023 129 4,519 4,648 2024 130 4,512 4,642 2025 132 4,544 4,676 2026 133 4,574 4,707 Thereafter 1,012 64,040 65,052 Total 1,761 86,896 88,657 Less: Present value discount (561) (36,830) (37,391) Lease Liabilities $ 1,200 $ 50,066 $ 51,266
RIGHT-OF-USE ASSETS AND LEASE LIABILITIES	RIGHT-OF-USE ASSETS AND LEASE LIABILITIES We have 48 lease contracts, including 45 operating leases and three finance leases at December 31, 2021. These leases are for our branch, loan production and support services facilities. Included in the lease expense for premises are leases with one S&T director, which totaled approximately $0.2 million for each of the three years 2021, 2020 and 2019. The following table presents our lease expense for finance and operating leases for the years ended December 31: (dollars in thousands) 2021 2020 2019 Operating lease expense (1) $ 5,135 $ 5,711 $ 4,221 Amortization of ROU assets - finance leases (1) 224 224 101 Interest on lease liabilities - finance leases (2) 74 84 74 Total Lease Expense $ 5,433 $ 6,019 $ 4,396 (1) Included in occupancy expense in our Consolidated Statements of Net Income. (2) Included in borrowings interest expense in our Consolidated Statements of Net Income. The following table presents our ROU assets, weighted average term and the discount rates for finance and operating leases as of December 31: (dollars in thousands) 2021 2020 Operating Leases ROU assets $ 44,067 $ 46,245 Operating cash flows $ 6,570 $ 6,489 Finance Leases ROU assets $ 1,055 $ 1,278 Operating cash flows $ 74 $ 84 Financing cash flows $ 194 $ 180 Weighted Average Lease Term - Years Operating leases 18.9 18.7 Finance leases 12.4 12.1 Weighted Average Discount Rate Operating leases 5.82 % 5.90 % Finance leases 5.91 % 5.81 % During 2021, we entered into one new operating lease increasing the right-of-use asset and the related liability values by $3.0 million. During 2020, two operating leases were considered abandoned due to branch closures and the right-of-use asset values were reduced by $0.5 million to zero and the related liabilities were reduced by $0.2 million. We recognized additional expense of $0.3 million at the date of abandonment for these leases. The following table presents the maturity analysis of lease liabilities for finance and operating leases as of December 31, 2021: (dollars in thousands) Maturity Analysis Finance Operating Total 2022 $ 225 $ 4,707 $ 4,932 2023 129 4,519 4,648 2024 130 4,512 4,642 2025 132 4,544 4,676 2026 133 4,574 4,707 Thereafter 1,012 64,040 65,052 Total 1,761 86,896 88,657 Less: Present value discount (561) (36,830) (37,391) Lease Liabilities $ 1,200 $ 50,066 $ 51,266

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
PREMISES AND EQUIPMENT	PREMISES AND EQUIPMENT The following table is a summary of premises and equipment as of the dates presented: December 31, (dollars in thousands) 2021 2020 Land $ 8,651 $ 8,651 Premises 62,313 61,299 Furniture and equipment 46,799 45,072 Leasehold improvements 12,205 12,061 129,968 127,083 Accumulated depreciation (77,336) (71,469) Total $ 52,632 $ 55,614 Certain banking facilities are leased under finance leases and are included in total premises and equipment. We have one right-of-use asset for land in the amount of $0.1 million and two right-of use assets for buildings totaling $1.0 million. Additional information relating to leased right-of-use assets is included in Note 10 Right-of-Use Assets and Lease Liabilities.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The following table presents goodwill as of the dates presented: December 31, (dollars in thousands) 2021 2020 Balance at beginning of year $ 373,424 $ 371,621 Additions — 1,803 Balance at End of Year $ 373,424 $ 373,424 Goodwill represents the excess of the purchase price over the fair value of net assets acquired. Additional goodwill of $1.8 million was recorded during 2020 related to our acquisition of DNB. Refer to Note 2 Business Combinations for further details on the DNB merger. Goodwill is reviewed for impairment annually or more frequently if it is determined that a triggering event has occurred. Based upon our qualitative assessment performed for our annual impairment analysis as of October 1, 2021, we concluded that it is more likely than not that the fair value of the reporting units exceeds the carrying value. In general, the overall macroeconomic conditions and more specifically the economic conditions of the banking industry have improved throughout 2021. No events or circumstances since the November 1, 2021 annual impairment test were noted that would indicate it was more likely than not that goodwill impairment exists. The following table presents a summary of intangible assets as of the dates presented: December 31, (dollars in thousands) 2021 2020 Gross carrying amount at beginning of year $ 31,340 $ 31,052 Additions — 288 Accumulated amortization (24,445) (22,665) Balance at End of Year $ 6,895 $ 8,675 Intangible assets of $6.9 million at December 31, 2021 relate to core deposit and wealth management customer relationships resulting from acquisitions. The $0.3 million addition during 2020 related to acquired wealth management customer relationships. We determined the amount of identifiable intangible assets for our core deposits based upon an independent valuation. Other intangible assets are evaluated for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. There were no triggering events in 2021 requiring an impairment analysis to be completed. Amortization expense on finite-lived intangible assets totaled $1.8 million, $2.5 million and $0.8 million for 2021, 2020 and 2019. The following is a summary of the expected amortization expense for finite-lived intangible assets, assuming no new additions, for each of the five years following December 31, 2021 and thereafter: (dollars in thousands) Amount 2022 $ 1,518 2023 1,319 2024 1,151 2025 820 2026 671 Thereafter 1,416 Total $ 6,895

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES The following table indicates the amounts representing the value of derivative assets and derivative liabilities at December 31: Derivatives (included in Derivatives (included (dollars in thousands) 2021 2020 2021 2020 Derivatives not Designated as Hedging Instruments Interest Rate Swap Contracts—Commercial Loans Fair value $ 33,528 $ 78,319 $ 33,631 $ 79,033 Notional amount 1,017,178 983,638 1,017,178 983,638 Collateral posted — — 37,360 77,930 Interest Rate Lock Commitments—Mortgage Loans Fair value 401 2,900 — — Notional amount 12,148 51,053 — — Forward Sale Contracts—Mortgage Loans Fair value 4 — — 385 Notional amount 8,436 — — 47,062 Presenting offsetting derivatives that are subject to legally enforceable netting arrangements with the same party is permitted. For example, we may have a derivative asset and a derivative liability with the same counterparty to a swap transaction and are permitted to offset the asset position and the liability position resulting in a net presentation. The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets at December 31: Derivatives (included Derivatives (included (dollars in thousands) 2021 2020 2021 2020 Derivatives not Designated as Hedging Instruments Gross amounts recognized $ 37,289 $ 82,655 $ 37,392 $ 82,626 Gross amounts offset (3,761) (4,336) (3,761) (3,593) Net amounts presented in the Consolidated Balance Sheets 33,528 78,319 33,631 79,033 Gross amounts not offset (1) — — (37,360) (77,930) Net Amount $ 33,528 $ 78,319 $ (3,729) $ 1,103 (1) Amounts represent collateral posted for the periods presented. The following table indicates the gain or loss recognized in income on derivatives for the years ended December 31: (dollars in thousands) 2021 2020 2019 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ 610 $ (746) $ (132) Interest rate lock commitments—mortgage loans (2,499) 1,715 70 Forward sale contracts—mortgage loans 389 478 (54) Total Derivative (Loss)/Gain $ (1,500) $ 1,447 $ (116)

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2021
Transfers and Servicing of Financial Assets [Abstract]
MORTGAGE SERVICING RIGHTS	MORTGAGE SERVICING RIGHTS For the years ended December 31, 2021, 2020 and 2019, the 1-4 family mortgage loans that were sold to Fannie Mae amounted to $287.9 million, $345.1 million and $94.5 million. At December 31, 2021, 2020 and 2019 our servicing portfolio totaled $841.7 million, $718.2 million and $509.2 million. The following table indicates MSRs and the net carrying values: (dollars in thousands) Servicing Valuation Net Carrying Balance at December 31, 2019 $ 4,939 $ (277) $ 4,662 Additions 2,887 — 2,887 Amortization (1,206) — (1,206) Temporary impairment — (1,354) (1,354) Balance at December 31, 2020 $ 6,620 $ (1,631) $ 4,989 Additions 2,974 — 2,974 Amortization (1,707) — (1,707) Temporary recapture — 1,421 1,421 Balance at December 31, 2021 $ 7,887 $ (210) $ 7,677

Qualified Affordable Housing

Qualified Affordable Housing	12 Months Ended
	Dec. 31, 2021
Investments in Affordable Housing Projects [Abstract]
QUALIFIED AFFORDABLE HOUSING	QUALIFIED AFFORDABLE HOUSING As part of our responsibilities under the Community Reinvestment Act and due to their favorable federal income tax benefits, we invest in Low Income Housing partnerships, or LIHPs. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. These investments are recorded in other assets on our balance sheet. Our maximum exposure to loss associated with these investments consists of the investments' fair value plus any unfunded commitments as well as the denial of the tax credits if the project is deemed non-compliant. We do not have any loss reserves recorded related to these investments because we believe the likelihood of any loss to be remote. Our investments in LIHPs represent unconsolidated variable interest entities, or VIEs, and the assets and liabilities of the partnerships are not recorded on our balance sheet. We have determined that we are not the primary beneficiary of these VIEs because we do not have the power to direct the activities that most significantly impact their economic performance. Our total investment in qualified affordable housing projects was $12.6 million at December 31, 2021 and $8.4 million at December 31, 2020. Amortization expense, included in other noninterest expense in the Consolidated Statements of Net Income (Loss), was $1.2 million, $3.2 million and $2.6 million for the twelve months ended December 31, 2021, 2020 and 2019. The amortization expense was offset by tax credits of $2.0 million, $2.2 million and $4.2 million for the twelve months ended December 31, 2021, 2020, and 2019 as a reduction to our federal tax provision. In 2021, we entered into two new qualified affordable housing projects and committed to a total investment of $19.4 million for these new projects. As of December 31, 2021, $2.3 million of funds were invested into one of these new projects. No amortization expense or tax credits will be recognized for these new projects until complete.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2021
Deposits, by Component, Alternative [Abstract]
Deposits	DEPOSITS The following table presents the composition of deposits at December 31 and interest expense for the years ended December 31: 2021 2020 2019 (dollars in thousands) Balance Interest Balance Interest Balance Interest Noninterest-bearing demand $ 2,748,586 $ — $ 2,261,994 $ — $ 1,698,082 $ — Interest-bearing demand 979,133 809 864,510 2,681 962,331 3,915 Money market 2,070,579 3,651 1,937,063 11,645 1,949,811 30,236 Savings 1,110,155 366 969,508 972 830,919 1,928 Certificates of deposit 1,088,071 5,930 1,387,463 20,688 1,595,433 26,947 Total $ 7,996,524 $ 10,757 $ 7,420,538 $ 35,986 $ 7,036,576 $ 63,026 The aggregate of all certificates of deposits over $250,000, including brokered CDs, were $243.4 million and $329.7 million at December 31, 2021 and 2020. The following table indicates the scheduled maturities of certificates of deposit at December 31, 2021: (dollars in thousands) Amount 2022 $ 961,578 2023 40,622 2024 21,712 2025 44,345 2026 16,475 Thereafter 3,339 Total $ 1,088,071

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
SHORT-TERM BORROWINGS	SHORT-TERM BORROWINGS Short-term borrowings are for terms under or equal to one year and are comprised of securities sold under REPOs and FHLB advances. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation, or FDIC. Securities pledged as collateral under these REPO financing arrangements cannot be sold or repledged by the secured party and, therefore, the REPOs are accounted for as secured borrowings. Mortgage-backed securities with amortized cost of $86.3 million and carrying value of $88.4 million at December 31, 2021 and amortized cost of $65.1 million and carrying value of $68.4 million at December 31, 2020 were pledged as collateral for these secured transactions. The pledged securities are held in safekeeping at the Federal Reserve. Due to the overnight short-term nature of REPOs, potential risk due to a decline in the value of the pledged collateral is low. Collateral pledging requirements with REPOs are monitored daily. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans. The following table presents the composition of short-term borrowings, the weighted average interest rate as of December 31 and interest expense for the years ended December 31: 2021 2020 2019 (dollars in thousands) Balance Weighted Interest Balance Weighted Interest Balance Weighted Interest REPOs $ 84,491 0.10 % $ 79 $ 65,163 0.25 % $ 169 $ 19,888 0.74 % $ 110 FHLB advances — — % 12 75,000 0.19 % 1,434 281,319 1.84 % 6,416 Total Short-term Borrowings $ 84,491 0.10 % $ 91 $ 140,163 0.22 % $ 1,603 $ 301,207 1.76 % $ 6,526

Long-Term Borrowings and Subord

Long-Term Borrowings and Subordinated Debt	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
LONG-TERM BORROWINGS AND SUBORDINATED DEBT	LONG-TERM BORROWINGS AND SUBORDINATED DEBT Long-term borrowings are for original terms greater than one year and are comprised of FHLB advances, finance leases and junior subordinated debt securities. Our long-term borrowings were $22.4 million as of December 31, 2021 and $23.7 million as of December 31, 2020. Long-term FHLB advances are secured by the same loans as short-term FHLB advances. Total loans pledged as collateral at the FHLB were $4.0 billion at December 31, 2021. We were eligible to borrow up to an additional $2.5 billion based on qualifying collateral and up to a maximum borrowing capacity of $2.8 billion at December 31, 2021. The following table represents the balance of long-term borrowings, the weighted average interest rate as of December 31 and interest expense for the years ended December 31: (dollars in thousand) 2021 2020 2019 Long-term borrowings $ 22,430 $ 23,681 $ 50,868 Weighted average interest rate 1.94 % 2.03 % 2.60 % Interest expense $ 458 $ 1,201 $ 1,831 Scheduled annual maturities and average interest rates for all of our long-term debt for each of the five years subsequent to December 31, 2020 and thereafter are as follows: (dollars in thousands) Balance Average Rate 2022 $ 7,689 2.29 % 2023 464 5.74 % 2024 13,381 1.34 % 2025 81 5.98 % 2026 87 6.00 % Thereafter 728 6.01 % Total $ 22,430 1.94 % Junior Subordinated Debt Securities The following table represents the composition of junior subordinated debt securities at December 31 and the interest expense for the years ended December 31: 2021 2020 2019 (dollars in thousands) Balance Interest Balance Interest Balance Interest Junior subordinated debt $ 25,000 $ 756 $ 34,750 $ 1,007 $ 34,753 $ 1,059 Junior subordinated debt—trust preferred securities 29,393 1,087 29,333 1,279 29,524 1,251 Total $ 54,393 $ 1,843 $ 64,083 $ 2,286 $ 64,277 $ 2,310 The following table summarizes the key terms of our junior subordinated debt securities: (dollars in thousands) 2001 Trust 2005 Trust 2006 Junior 2008 Trust Junior Subordinated Debt $— $— $25,000 $— Trust Preferred Securities 5,155 4,124 — 20,619 Stated Maturity Date 7/25/2031 5/23/2035 12/15/2036 3/15/2038 Optional redemption date at par Any time after 7/25/2011 Any time after 5/23/2010 Any time after 9/15/2011 Any time after 3/15/2013 Regulatory Capital Tier 1 Tier 1 Tier 2 Tier 1 Interest Rate 6 Month LIBOR plus 375 bps 3 Month LIBOR plus 177 bps 3 month LIBOR plus 160 bps 3 month LIBOR plus 350 bps Interest Rate at December 31, 2021 3.90% 1.93% 1.80% 3.70%

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Commitments In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event the customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties. The following table sets forth our commitments and letters of credit as of the dates presented: December 31, (dollars in thousands) 2021 2020 Commitments to extend credit $ 2,583,957 $ 2,185,752 Standby letters of credit 87,335 89,095 Total $ 2,671,292 $ 2,274,847 Allowance for Credit Losses on Unfunded Loan Commitments We maintain an ACL on unfunded commercial and consumer lending commitments and letters of credit to provide for the risk of loss in these arrangements. The activity in the unfunded loan commitments reserve is summarized as of the dates presented: (dollars in thousands) December 31, 2021 December 31, 2020 Balance at beginning of period $ 4,467 $ 3,112 Impact of adopting ASU 2016-13 at January 1, 2020 — 1,349 Balance after adoption of ASU 2016-13 4,467 4,461 Provision for credit losses 722 6 Total $ 5,189 $ 4,467 Contractual Obligations Contractual obligations represent future cash commitments and liabilities under agreements with third parties and exclude contingent contractual liabilities for which we cannot reasonably predict future payments. We have various financial obligations, including contractual obligations and commitments that may require future cash payments. The following table presents as of December 31, 2021 significant fixed and determinable contractual obligations to third parties by payment date: Payments Due In (dollars in thousands) 2022 2023-2024 2025-2026 Later Years Total Deposits without a stated maturity (1) $ 6,908,453 $ — $ — $ — $ 6,908,453 Certificates of deposit (1) 961,578 62,334 60,820 3,339 1,088,071 Securities sold under repurchase agreements (1) 84,491 — — — 84,491 Short-term borrowings (1) — — — — — Long-term borrowings (1) 7,689 13,845 168 728 22,430 Junior subordinated debt securities (1) — — — 54,393 54,393 Operating and capital leases 4,932 9,290 9,383 65,052 88,657 Purchase obligations 19,823 42,432 46,492 — 108,747 Total $ 7,986,966 $ 127,901 $ 116,863 $ 123,512 $ 8,355,242 (1) Excludes interest Operating lease obligations represent short and long-term lease arrangements as described in Note 11 Premises and Equipment, to the Consolidated Financial Statements. Purchase obligations primarily represent obligations under agreement with our third party data processing servicer and communications charges. Litigation In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims pending will not have a material adverse effect on our consolidated financial position or results of operations.

Revenue From Contracts With Cus

Revenue From Contracts With Customers	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS	REVENUE FROM CONTRACTS WITH CUSTOMERS The information presented in the following table presents the point of revenue recognition for revenue from contracts with customers. Other revenue streams are excluded such as: interest income, net securities gains and losses, insurance, mortgage banking and other revenues that are accounted for under other GAAP. Years ended December 31, (dollars in thousands) 2021 2020 2019 Revenue Streams (1) Point of Revenue Recognition Service charges on deposit accounts Over a period of time $ 1,880 $ 1,797 $ 1,859 At a point in time 13,160 11,800 11,457 $ 15,040 $ 13,597 $ 13,316 Debit and credit card Over a period time $ 919 $ 738 $ 723 At a point in time 17,033 14,355 12,682 $ 17,952 $ 15,093 $ 13,405 Wealth management Over a period of time $ 9,187 $ 7,919 $ 6,939 At a point in time 3,702 2,038 1,684 $ 12,889 $ 9,957 $ 8,623 Other fee revenue At a point in time $ 1,900 $ 1,810 $ 3,836 (1) Refer to Note 1 Summary of Significant Accounting Policies for the types of revenue streams that are included within each category.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The following table presents the composition of income tax expense (benefit) for the years ended December 31: (dollars in thousands) 2021 2020 2019 Federal Current $ 22,581 $ 4,256 $ 18,918 Deferred 2,273 (4,273) (406) Total Federal 24,854 (17) 18,512 State Current 361 145 589 Deferred 110 (129) 25 Total State 471 16 614 Total Federal and State $ 25,325 $ (1) $ 19,126 The provision for income taxes differs from the amount computed by applying the statutory federal income tax rate to income before income taxes. We ordinarily generate an annual effective tax rate that is less than the statutory rate of 21 percent primarily due to benefits resulting from certain partnership investments, such as low income housing and historic rehabilitation projects, tax-exempt interest, excludable dividend income and tax-exempt income on BOLI. The state tax provision is due to taxable business activities conducted at our loan production office in New York. The following table presents a reconciliation of the statutory tax rate to the effective tax rate for the years ended December 31: 2021 2020 2019 Statutory tax rate 21.0 % 21.0 % 21.0 % Low income housing tax credits (1.5) % (11.1) % (3.3) % Tax-exempt interest (1.3) % (11.9) % (2.1) % Bank owned life insurance (0.3) % (1.8) % (0.4) % Merger related expenses — % — % 0.3 % Other 0.8 % 3.8 % 0.8 % Effective Tax Rate 18.7 % — % 16.3 % The following table presents significant components of our temporary differences as of the dates presented: December 31, (dollars in thousands) 2021 2020 Deferred Tax Assets: Allowance for credit losses $ 22,083 $ 26,051 Lease liabilities 10,876 11,368 State net operating loss carryforwards 5,565 5,489 Net adjustment to funded status of pension 3,922 4,692 Low income housing partnerships 3,270 3,996 Other employee benefits 3,433 2,050 Other 3,973 3,798 Gross Deferred Tax Assets 53,122 57,444 Less: Valuation allowance (5,565) (5,489) Total Deferred Tax Assets 47,557 51,955 Deferred Tax Liabilities: Right-of-use lease assets (9,603) (10,141) Net unrealized gains on securities available-for-sale (2,004) (7,125) Deferred loan income (6,697) (6,796) Prepaid pension (4,566) (5,209) Purchase accounting adjustments (1,954) (1,971) Depreciation on premises and equipment (1,107) (1,275) Other (1,466) (1,245) Total Deferred Tax liabilities (27,397) (33,762) Net Deferred Tax Asset $ 20,160 $ 18,193 We establish a valuation allowance when it is more likely than not that we will not be able to realize the benefit of the deferred tax assets. Except for Pennsylvania net operating losses, or NOLs, we have determined that no valuation allowance is needed for deferred tax assets because it is more likely than not that these assets will be realized through future reversals of existing temporary differences and through future taxable income. The valuation allowance is reviewed quarterly and adjusted based on management’s assessments of realizable deferred tax assets. Gross deferred tax assets were reduced by a valuation allowance of $5.5 million in 2021 and in 2020 related to Pennsylvania income tax NOLs. The Pennsylvania NOL carryforwards total $55.7 million and will expire in the years 2021-2041. Unrecognized Tax Benefits The following table reconciles the change in Federal and State gross unrecognized tax benefits, or UTB, for the years ended December 31: (dollars in thousands) 2021 2020 2019 Balance at beginning of year $ 1,277 $ 1,051 $ 768 Prior period tax positions — (18) (10) Current period tax positions 54 244 293 Balance at End of Year $ 1,331 $ 1,277 $ 1,051 Amount That Would Impact the Effective Tax Rate if Recognized $ 1,069 $ 1,027 $ 848 We classify interest and penalties as an element of tax expense. We monitor changes in tax statutes and regulations to determine if significant changes will occur over the next 12 months. As of December 31, 2021, no significant changes to UTB are projected; however, tax audit examinations are possible. As of December 31, 2021, all income tax returns filed for the tax years 2017 - 2020 remain subject to examination by the Internal Revenue Service. In 2021, an audit of our New York State tax returns for the period January 1, 2016 through December 31, 2018 concluded with a final tax assessment of $0.1 million primarily related to the qualified loans exemption and Metropolitan Commuter Transportation District tax.

Tax Effects on Other Comprehens

Tax Effects on Other Comprehensive (Loss) Income	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
TAX EFFECTS ON OTHER COMPREHENSIVE (LOSS) INCOME	TAX EFFECTS ON OTHER COMPREHENSIVE (LOSS) INCOME The following tables present the tax effects of the components of other comprehensive (loss) income for the years ended December 31: (dollars in thousands) Pre-Tax Tax Benefit (Expense) Net of Tax 2021 Net change in unrealized gains on debt securities available-for sale $ (23,972) $ 5,115 $ (18,857) Net available-for-sale securities (gains) losses reclassified into earnings — — — Adjustment to funded status of employee benefit plans 3,561 (765) 2,796 Other Comprehensive Loss $ (20,411) $ 4,350 $ (16,061) 2020 Net change in unrealized gains on debt securities available-for-sale $ 22,683 $ (4,827) $ 17,856 Net available-for-sale securities (gains) losses reclassified into earnings — — — Adjustment to funded status of employee benefit plans 3,549 (764) 2,785 Other Comprehensive Income $ 26,232 $ (5,591) $ 20,641 2019 Net change in unrealized gains on debt securities available-for-sale $ 15,793 $ (3,367) $ 12,426 Net available-for-sale securities losses (gains) reclassified into earnings 26 (6) 20 Adjustment to funded status of employee benefit plans (1,282) 273 (1,009) Other Comprehensive Income $ 14,537 $ (3,100) $ 11,437

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
EMPLOYEE BENEFITS	EMPLOYEE BENEFITS We maintain a qualified defined benefit pension plan, or Plan, covering substantially all employees hired prior to January 1, 2008. The benefits are based on years of service and the employee’s compensation for the highest five Our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plan in 2016. We will continue recording pension expense related to these plans, primarily representing interest costs on the accumulated benefit obligation and amortization of actuarial losses accumulated in the plan, as well as income from expected investment returns on pension assets. Since the plans have been frozen, no service costs are included in net periodic pension expense. The expected long-term rate of return on plan assets is 2.42 percent. The following table summarizes the activity in the benefit obligation and Plan assets deriving the funded status: (dollars in thousands) 2021 2020 Change in Projected Benefit Obligation Projected benefit obligation at beginning of year $ 117,506 $ 113,679 Interest cost 2,950 3,456 Actuarial gain/(loss) (2,136) 10,525 Benefits paid (14,223) (10,154) Projected Benefit Obligation at End of Year $ 104,097 $ 117,506 Change in Plan Assets Fair value of plan assets at beginning of year $ 122,344 $ 116,652 Actual return on plan assets (596) 15,731 Employer contributions — 115 Benefits paid (14,223) (10,154) Fair Value of Plan Assets at End of Year $ 107,525 $ 122,344 Funded Status $ 3,428 $ 4,838 The following table sets forth the amounts recognized in accumulated other comprehensive income at December 31: (dollars in thousands) 2021 2020 Net actuarial loss (18,029) (19,572) Total (Before Tax Effects) $ (18,029) $ (19,572) Below are the actuarial weighted average assumptions used in determining the benefit obligation: 2021 2020 Discount rate 2.80 % 2.48 % Rate of compensation increase (1) — % — % (1) Rate of compensation increase is not applicable for 2021 and 2020 due to the amendment to freeze benefit accruals under the qualified and nonqualified defined benefit pension plans effective March 31, 2016. The following table summarizes the components of net periodic pension cost and other changes in Plan assets and benefit obligations recognized in other comprehensive loss for the years ended December 31: (dollars in thousands) 2021 2020 2019 Components of Net Periodic Pension Cost Interest cost on projected benefit obligation $ 2,950 $ 3,456 $ 3,987 Expected return on plan assets (2,677) (3,925) (4,731) Amortization of prior service credit - DNB merger — — 7 Recognized net actuarial loss 1,051 1,419 1,604 Settlement charge 1,629 833 — Net Periodic Pension Expense $ 2,953 $ 1,783 $ 867 Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss) Net actuarial loss/(gain) $ 1,137 $ (1,282) $ 2,370 Recognized net actuarial loss (1,051) (1,419) (1,604) Settlement loss recognized (1,629) (833) — Recognized prior service credit — — — Total (Before Tax Effects) $ (1,543) $ (3,534) $ 766 Total Recognized in Net Benefit Cost and Other Comprehensive Income/(Loss) (Before Tax Effects) $ 1,410 $ (1,751) $ 1,633 The following table summarizes the actuarial weighted average assumptions used in determining net periodic pension cost: 2021 2020 2019 Discount rate 2.48 % 3.25 % 4.31 % Rate of compensation increase (1) — % — % — % Expected return on assets 2.42 % 3.45 % 4.80 % (1) Rate of compensation increase is not applicable for 2021, 2020, and 2019 due to the amendment to freeze benefit accruals under the qualified and nonqualified defined benefit pension plans effective March 31, 2016. The accumulated benefit obligation for the Plan was $104.1 million at December 31, 2021 and $117.5 million at December 31, 2020. We consider many factors when setting the assumed rate of return on Plan assets. As a general guideline the assumed rate of return is equal to the weighted average of the expected returns for each asset category and is estimated based on historical returns as well as expected future returns. The weighted average discount rate is derived from corporate yield curves. S&T Bank’s Retirement Plan Committee determines the investment policy for the Plan. In general, the targeted asset allocation is 5 percent to 15 percent equities and alternatives and 85 percent to 95 percent fixed income. A strategic allocation within each asset class is based on the Plan’s duration, time horizon, risk tolerances, performance expectations, and asset class preferences. Investment managers have discretion to invest in any equity or fixed-income asset class, subject to the securities guidelines of the Plan’s Investment Policy Statement. At this time, S&T Bank is not required to make a cash contribution to the Plan in 2022. The following table provides information regarding estimated future benefit payments to be paid in each of the next five years and in the aggregate for the five years thereafter: (dollars in thousands) Amount 2022 $ 7,088 2023 7,023 2024 6,768 2025 6,590 2026 6,361 2027 - 2031 30,536 We also have nonqualified supplemental executive pension plans, or SERPs, for certain key employees. The SERPs are unfunded. The projected benefit obligations related to the SERPs were $2.3 million and $5.6 million at December 31, 2021 and 2020. These amounts also represent the net amount recognized in the statement of financial position for the SERPs. Net periodic benefit costs for the SERPs were $0.6 million for the year ended December 31, 2021 and $0.7 million for the year ended December 31, 2020 and $0.4 million for the year ended December 31, 2019. Additionally, $0.4 million before tax was reflected in accumulated other comprehensive income (loss) at December 31, 2021 and $2.4 million at December 31,2020 in relation to the SERPs. Net periodic benefit cost of $0.6 million for the year ended December 31, 2021 included a settlement charge of $0.3 million. The actuarial assumptions used for the SERPs are the same as those used for the Plan. We maintain a Thrift Plan, a qualified defined contribution plan, in which substantially all employees are eligible to participate. We make matching contributions to the Thrift Plan up to 3.5 percent of participants’ eligible compensation and may make additional profit-sharing contributions as provided by the Thrift Plan. Expense related to these contributions amounted to $2.4 million in 2021 and 2020 and $2.0 million in 2019. Fair Value Measurements The following tables present our Plan assets measured at fair value on a recurring basis by fair value hierarchy level at December 31, 2021 and 2020. During the years ended December 31, 2021 and 2020 there were no transfers between Level 1 and Level 2 for items of a recurring basis. There were no purchases or transfers of Level 3 plan assets in 2021 or 2020. December 31, 2021 Fair Value Asset Classes (1) (dollars in thousands) Level 1 Level 2 Level 3 Total Cash and cash equivalents (2) $ 3,759 $ — $ — $ 3,759 Fixed income (3) 93,495 — — 93,495 Equities: Equity index mutual funds—international (4) 3,043 — — 3,043 Domestic individual equities (5) 7,228 — — 7,228 Total Assets at Fair Value $ 107,525 $ — $ — $ 107,525 (1) Refer to Note 1 Summary of Significant Accounting Policies, Fair Value Measurements for a description of levels within the fair value hierarchy. (2) This asset class includes FDIC insured money market instruments. (3) This asset class includes a variety of fixed income mutual funds which primarily invest in investment grade rated securities. Investment managers have discretion to invest in fixed income related securities including futures, options and other derivatives. Investments may be made in currencies other than the U.S. dollar. (4) The sole investment within this asset class is the Vanguard Total International Stock Index Fund Admiral Shares. (5) This asset class includes individual domestic equities invested in an active all-cap strategy. It may also include convertible bonds. December 31, 2020 Fair Value Asset Classes (1) (dollars in thousands) Level 1 Level 2 Level 3 Total Cash and cash equivalents (2) $ 1,563 $ — $ — $ 1,563 Fixed income (3) 108,583 — — 108,583 Equities: Equity index mutual funds—international (4) 3,332 — — 3,332 Domestic individual equities (5) 8,866 — — 8,866 Total Assets at Fair Value $ 122,344 $ — $ — $ 122,344 (1) Refer to Note 1 Summary of Significant Accounting Policies, Fair Value Measurements for a description of levels within the fair value hierarchy. (2) This asset class includes FDIC insured money market instruments. (3) This asset class includes a variety of fixed income mutual funds which primarily invest in investment grade rated securities. Investment managers have discretion to invest in fixed income related securities including futures, options and other derivatives. Investments may be made in currencies other than the U.S. dollar. (4) The sole investment within this asset class is Vanguard Total International Stock Index Fund Admiral Shares. (5) This asset class includes individual domestic equities invested in an active all-cap strategy. It may also include convertible bonds.

Incentive and Restricted Stock

Incentive and Restricted Stock Plan and Dividend Reinvestment Plan	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
INCENTIVE AND RESTRICTED STOCK PLAN AND DIVIDEND REINVESTMENT PLAN	INCENTIVE AND RESTRICTED STOCK PLAN AND DIVIDEND REINVESTMENT PLAN On May 17, 2021 shareholders approved the adoption of the 2021 Incentive Plan that provides for cash performance awards and for granting incentive stock options, nonstatutory stock options, restricted stock, restricted stock units and appreciation rights. The 2021 Plan replaces and supersedes the S&T Bancorp, Inc. 2014 Incentive Plan. Since the 2021 Plan has been approved by our shareholders, no new awards will be granted under the 2014 Plan. The 2014 Plan will continue to govern all awards granted under that plan. A maximum of 1,000,000 shares of our common stock were available for awards granted under the 2021 Incentive Plan and the plan expires ten years from the date of board approval. Previously granted but forfeited shares are added to the shares available for issuance. The 2014 Incentive Stock Plan also provided for cash performance awards and for granting incentive stock options, nonstatutory stock options, restricted stock, restricted stock units and appreciation rights. A maximum of 750,000 shares of our common stock were available for awards granted under the 2014 Incentive Plan and the plan expires ten years from the date of board approval. Previously granted but forfeited shares are added to the shares available for issuance. Restricted Stock We periodically issue restricted stock to employees and directors pursuant to our 2021 and 2014 Stock Plans. Restricted stock awards are part of the compensation arrangements approved by the Compensation and Benefits Committee. Restricted shares granted under the plans consist of both time and performance-based awards. The awards are granted in accordance with performance levels set by the Compensation and Benefits Committee. During 2021, we granted 30,959 restricted shares of common stock under the 2021 Stock Plan. In 2021, 2020 and 2019, we granted 99,711, 230,703 and 84,882 restricted shares of common stock under the 2014 Stock Plan. The following table provides information about restricted stock awards granted under the plans for the periods presented: December 31, Vesting Period 2021 2020 2019 2021 Stock Plan Directors One year 14,650 — — Chief Executive Officer One year 8,309 — — Other Awards Three years 8,000 — — 2014 Stock Plan Directors One year — 23,153 13,057 Senior Management Three years 78,769 123,881 71,825 Other Awards Three years 20,942 83,669 — Total Restricted Stock Grants 130,670 230,703 84,882 Common stock is issued as vesting restrictions lapse, which varies according to the terms of the vesting schedules in the award agreements. Restricted stock grants are forfeited if a grantee leaves S&T before the end of the vesting period except where accelerated vesting provisions are defined with the award agreements. During 2021, 2020 and 2019, we recognized compensation expense of $2.4 million, $0.7 million and $2.4 million and realized a tax benefit of $0.5 million, $0.2 million and $0.5 million related to restricted stock grants. The following table provides information about restricted stock granted under the Plans for the years ended December 31: Restricted Weighted Average Non-vested at December 31, 2019 182,035 $ 34.06 Granted 230,703 23.43 Vested 77,317 37.39 Forfeited 58,741 32.77 Non-vested at December 31, 2020 276,680 $ 24.54 Granted 130,670 33.17 Vested 71,152 27.66 Forfeited 57,810 34.93 Non-vested at December 31, 2021 278,388 $ 25.64 As of December 31, 2021, there was $3.6 million of total unrecognized compensation cost related to restricted stock that will be recognized as compensation expense over a weighted average period of 1.93 years. Dividend Reinvestment Plan We also sponsor a Dividend Reinvestment and Stock Purchase Plan, or Dividend Plan, where shareholders may purchase shares of S&T common stock at the average fair value with reinvested dividends and voluntary cash contributions. The plan administrator and transfer agent may purchase shares directly from us from shares held in treasury or purchase shares in the open market to fulfill the Dividend Plan’s needs.

Parent Company Condensed Financ

Parent Company Condensed Financial Information	12 Months Ended
	Dec. 31, 2021
Condensed Financial Information Disclosure [Abstract]
PARENT COMPANY CONDENSED FINANCIAL INFORMATION	PARENT COMPANY CONDENSED FINANCIAL INFORMATION The following condensed financial statements summarize the financial position of S&T Bancorp, Inc. as of December 31, 2021 and 2020 and the results of its operations and cash flows for each of the three years ended December 31, 2021, 2020 and 2019. BALANCE SHEETS December 31, (dollars in thousands) 2021 2020 ASSETS Cash $ 10,769 $ 6,585 Investments in: Bank subsidiary 1,209,796 1,168,831 Non-bank subsidiaries 5,684 10,493 Other assets 9,993 8,614 Total Assets $ 1,236,242 $ 1,194,523 LIABILITIES Long-term debt $ 29,521 $ 39,317 Other liabilities 267 495 Total Liabilities 29,788 39,812 Total Shareholders’ Equity 1,206,454 1,154,711 Total Liabilities and Shareholders’ Equity $ 1,236,242 $ 1,194,523 STATEMENTS OF NET INCOME Years ended December 31, (dollars in thousands) 2021 2020 2019 Dividends from subsidiaries $ 62,333 $ 59,315 $ 59,490 Investment income — — 1 Total Income 62,333 59,315 59,491 Interest expense on long-term debt 313 1,696 1,285 Other expenses 5,034 4,464 4,325 Total Expense 5,347 6,160 5,610 Income before income tax and undistributed net income of subsidiaries 56,986 53,155 53,881 Income tax benefit (1,140) (1,315) (1,189) Income before undistributed net income of subsidiaries 58,126 54,470 55,070 Equity in undistributed net income (distribution in excess of net income) of: Bank subsidiary 57,025 (27,529) 42,683 Non-bank subsidiaries (4,808) (5,901) 481 Net Income $ 110,343 $ 21,040 $ 98,234 STATEMENTS OF CASH FLOWS Years ended December 31, (dollars in thousands) 2021 2020 2019 OPERATING ACTIVITIES Net Income $ 110,343 $ 21,040 $ 98,234 Equity in undistributed (earnings) losses of subsidiaries (52,217) 33,430 (43,164) Other 761 1,708 (99) Net Cash Provided by Operating Activities 58,887 56,178 54,971 INVESTING ACTIVITIES Net investments in subsidiaries — — 176 Acquisitions — — (10) Net Cash Provided by Investing Activities — — 166 FINANCING ACTIVITIES Repayment of long term debt (9,750) — — Sale of treasury shares, net (629) (594) (915) Purchase of treasury shares — (12,559) (18,222) Cash dividends paid to common shareholders (44,324) (43,949) (37,360) Payment to repurchase of warrant — — — Net Cash Used in Financing Activities (54,703) (57,102) (56,497) Net decrease in cash 4,184 (924) (1,360) Cash at beginning of year 6,585 7,509 8,869 Cash at End of Year $ 10,769 $ 6,585 $ 7,509

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2021
Regulatory Capital Requirements Under Banking Regulations [Abstract]
REGULATORY MATTERS	REGULATORY MATTERS We are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet the minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on our Consolidated Financial Statements. Under capital guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that involve quantitative measures of our assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. Our capital amounts and classification are also subject to qualitative judgments by the regulators about risk weightings and other factors. The most recent notifications from the Federal Reserve and the FDIC categorized S&T and S&T Bank as well capitalized under the regulatory framework for corrective action. There have been no conditions or events that we believe have changed S&T's or S&T Bank’s status during 2021 and 2020. Common equity tier 1 capital includes common stock and related surplus plus retained earnings, less goodwill and intangible assets subject to a limitation and certain deferred tax assets subject to a limitation. In addition, we made a one-time permanent election to exclude accumulated other comprehensive income from capital. For regulatory purposes, trust preferred securities totaling $29.0 million, issued by an unconsolidated trust subsidiary of S&T underlying junior subordinated debt, are included in Tier 1 capital for S&T. Total capital consists of Tier 1 capital plus junior subordinated debt and the ACL subject to limitation. We currently have $25.0 million in junior subordinated debt which is included in Tier 2 capital for S&T in accordance with current regulatory reporting requirements. Quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios of Total, Tier 1 and Common Equity Tier 1 capital to risk-weighted assets and Tier 1 capital to average assets. As of December 31, 2021 and 2020, we met all capital adequacy requirements to which we are subject. The following table summarizes risk-based capital amounts and ratios for S&T and S&T Bank: Actual Minimum To be (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2021 Leverage Ratio S&T $ 889,785 9.74 % $ 365,535 4.00 % $ 456,918 5.00 % S&T Bank 864,127 9.46 % 365,544 4.00 % 456,930 5.00 % Common Equity Tier 1 (to Risk-Weighted Assets) S&T 860,785 12.03 % 322,109 4.50 % 465,268 6.50 % S&T Bank 864,127 12.09 % 321,711 4.50 % 464,694 6.50 % Tier 1 Capital (to Risk-Weighted Assets) S&T 889,785 12.43 % 429,479 6.00 % 572,638 8.00 % S&T Bank 864,127 12.09 % 428,948 6.00 % 571,931 8.00 % Total Capital (to Risk-Weighted Assets) S&T 987,420 13.79 % 572,638 8.00 % 715,798 10.00 % S&T Bank 961,762 13.45 % 571,931 8.00 % 714,913 10.00 % As of December 31, 2020 Leverage Ratio S&T $ 852,515 9.43 % $ 350,311 4.00 % $ 437,889 5.00 % S&T Bank 810,636 9.27 % 349,739 4.00 % 437,174 5.00 % Common Equity Tier 1 (to Risk-Weighted Assets) S&T 796,515 11.33 % 316,338 4.50 % 456,933 6.50 % S&T Bank 810,636 11.55 % 315,792 4.50 % 456,144 6.50 % Tier 1 Capital (to Risk-Weighted Assets) S&T 825,515 11.74 % 421,784 6.00 % 562,379 8.00 % S&T Bank 810,636 11.55 % 421,056 6.00 % 561,408 8.00 % Total Capital (to Risk-Weighted Assets) S&T 944,686 13.44 % 562,379 8.00 % 702,974 10.00 % S&T Bank 922,007 13.14 % 561,408 8.00 % 701,760 10.00 %

Share Repurchase Plan

Share Repurchase Plan	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
SHARE REPURCHASE PLAN	SHARE REPURCHASE PLANOn March 15, 2021, our Board of Directors authorized an extension of its $50 million share repurchase plan, which was set to expire March 31, 2021. This authorization extended the expiration date of the repurchase plan through March 31, 2022. The plan permits S&T to repurchase from time to time up to the previously authorized $50 million in aggregate value of shares of S&T's common stock, with $37.4 million of capacity remaining at December 31, 2021, through a combination of open market and privately negotiated repurchases. The specific timing, price and quantity of repurchases will be at the discretion of S&T and will depend on a variety of factors, including general market conditions, the trading price of common stock, legal and contractual requirements, applicable securities laws and S&T's financial performance. The repurchase plan does not obligate us to repurchase any particular number of shares. We expect to fund any repurchases from cash on hand and internally generated funds. Any share repurchases will not begin until permissible under applicable laws. During the twelve months ended December 31, 2021, we had no repurchases. Repurchase activity was suspended in March of 2020 due to the impact of the COVID-19 pandemic.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations S&T Bancorp, Inc., or S&T, was incorporated on March 17, 1983 under the laws of the Commonwealth of Pennsylvania as a bank holding company and has five active direct wholly owned subsidiaries, S&T Bank, 9th Street Holdings, Inc., STBA Capital Trust I, DNB Capital Trust I and DNB Capital Trust II. DNB Capital Trust I and DNB Capital Trust II were acquired with the DNB merger on November 30, 2019. We own a 50 percent interest in Commonwealth Trust Credit Life Insurance Company, or CTCLIC. We are presently engaged in non-banking activities through the following six entities: 9th Street Holdings, Inc.; S&T Bancholdings, Inc.; CTCLIC; S&T Insurance Group, LLC; Stewart Capital Advisors, LLC; DN Acquisition, Inc. 9th Street Holdings, Inc. and S&T Bancholdings, Inc. are investment holding companies. CTCLIC, which is a joint venture with another financial institution, acts as a reinsurer of credit life, accident and health insurance policies sold by S&T Bank and the other institution. S&T Insurance Group, LLC, through its subsidiaries, offers a variety of insurance products. Stewart Capital Advisors, LLC is a registered investment advisor that manages private investment accounts for individuals and institutions. DN Acquisition Company, Inc. was acquired with the DNB merger and was incorporated for the purpose of acquiring and holding Other Real Estate Owned acquired through foreclosure or deed in-lieu-of foreclosure, as well as Bank-occupied real estate.
Accounting Policies	Accounting PoliciesOur financial statements have been prepared in accordance with GAAP. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the dates of the balance sheets and revenues and expenses for the periods then ended. Actual results could differ from those estimates.
Principles of Consolidation	Principles of Consolidation The Consolidated Financial Statements include the accounts of S&T and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.
Reclassification	Reclassification Amounts in prior years' financial statements and footnotes are reclassified whenever necessary to conform to the current year’s presentation. Reclassifications had no effect on our results of operations or financial condition.
Business Combinations	Business Combinations We account for business combinations using the acquisition method of accounting. All identifiable assets acquired, liabilities assumed and any non-controlling interest in the acquiree are recognized and measured as of the acquisition date at fair value. We record goodwill for the excess of the purchase price over the fair value of net assets acquired. Results of operations of the acquired entities are included in the Consolidated Statement of Net Income from the date of acquisition. Acquired loans are recorded at fair value on the date of acquisition with no carryover of the related allowance for credit losses, or ACL. Determining the fair value of acquired loans involves estimating the principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. In estimating the fair value of our acquired loans, we considered a number of factors including loss rates, internal risk rating, delinquency status, loan type, loan term, prepayment rates, recovery periods and the current interest rate environment. The premium or discount estimated through the loan fair value calculation is recognized into interest income on a level yield basis over the remaining life of the loans. Acquired loans, including those acquired in a business combination, are evaluated to determine if they have experienced more-than-insignificant deterioration in credit quality since origination. When the condition exists, these loans are referred to as purchased credit deteriorated, or PCD. An allowance is recognized for a PCD loan by adding it to the purchase price or fair value in a business combination. There is no provision for credit losses, or PCL, recognized upon acquisition of a PCD loan since the initial allowance is established through the purchase accounting. After initial recognition, the accounting for a PCD loan follows the credit loss model that applies to that type of asset. Purchased financial loans that do not have a more-than-significant deterioration in credit quality since origination are accounted for in a manner consistent with originated loans. An ACL is recorded with a corresponding charge to PCL. Subsequent to the acquisition date, the methods utilized to estimate the required ACL for these loans is similar to the method used for originated loans. Prior to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, the methods utilized to estimate the required allowance for loan losses, or ALL for acquired loans was similar to the method used for originated loans; however, we recorded a provision for credit losses only when the required allowance exceeded the remaining fair value adjustment. Acquired loans were considered impaired if there was evidence of credit deterioration since origination and if it was probable at time of acquisition that all contractually required payments would not be collected.
Fair Value Measurements	Fair Value Measurements We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, individually assessed loans, other real estate owned, or OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets. Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which are developed based on market data we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances. The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred. The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis. Recurring Basis Debt Securities Available-for-Sale We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing services which provide us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The fair value of U.S. treasury securities are based on quoted market prices in active markets and are classified as Level 1. The market valuation sources for other debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models and extensive quality control programs. Equity Securities Marketable equity securities with quoted prices in active markets for identical assets are classified as Level 1. Marketable equity securities in markets that are not active and are based on other observable information for comparable assets are classified as Level 2. Securities Held in a Deferred Compensation Plan We use quoted market prices to determine the fair value of our equity security assets. These securities are reported at fair value with the gains and losses included in other noninterest income in our Consolidated Statements of Net Income. These assets are held in a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1. Deferred compensation plan assets are reported in other assets in the Consolidated Balance Sheets. Derivative Financial Instruments We use derivative instruments, including interest rate swaps for commercial loans with our customers, interest rate lock commitments and forward commitments related to the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, such as interest rate curves and implied volatilities. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties’ nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings. Interest rate swaps for commercial loans are classified as Level 2. Interest rate lock commitments and forward commitments related to mortgage loans are classified as Level 3 due to significant unobservable inputs. Nonrecurring Basis Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale marked to fair value are classified as Level 3. Loans Individually Evaluated Loans that are individually evaluated to determine whether a specific allocation of ACL is needed are reported at the lower of amortized cost or fair value. Fair value is determined using the following methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Loans individually evaluated that are market to fair value are classified as Level 3. OREO and Other Repossessed Assets OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3. OREO and other repossessed assets are reported in other assets in the Consolidated Balance Sheets. Mortgage Servicing Rights MSRs are reported pursuant to the amortization method are evaluated for impairment quarterly by comparing the carrying value to the fair value of the MSRs. The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into mortgage banking in noninterest income in the Consolidated Statements of Net Income. Financial Instruments In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments. Cash and Cash Equivalents The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits approximate fair value. Loans Our methodology to fair value loans includes an exit price notion. The fair value of variable rate loans that may reprice frequently at short-term market rates is based on carrying values adjusted for liquidity and credit risk. The fair value of variable rate loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for liquidity and credit risk. The fair value of fixed rate loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk. Federal Home Loan Bank, or FHLB, and Other Restricted Stock It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; it is presented at carrying value. Collateral Receivable Collateral receivable is cash that is made available to counterparties as collateral for our interest rate swaps. The carrying amount included in other assets on our Consolidated Balance Sheets approximates fair value. Deposits The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value. Short-Term Borrowings The carrying amounts of securities sold under repurchase agreements, or REPOs, and other short-term borrowings approximate their fair values. Long-Term Borrowings The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values. Junior Subordinated Debt Securities The interest rate on the variable rate junior subordinated debt securities is reset quarterly; therefore, the carrying values approximate their fair values.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider cash and due from banks, interest-bearing deposits with banks and federal funds sold as cash and cash equivalents.
Securities	Securities We determine the appropriate classification of securities at the time of purchase. Debt securities are classified as available-for-sale with the intent to hold for an indefinite period of time, but may be sold in response to changes in interest rates, prepayment risk, liquidity needs or other factors. A determination will be made on whether a decline in the fair value below the amortized cost basis is due to credit-related factors or noncredit-related factors. Any impairment that is not credit related is recognized in Other Comprehensive Income, or OCI, net of applicable taxes. Credit-related impairment is recognized as an ACL on the balance sheet with a corresponding adjustment to provision for credit losses in the Consolidated Statements of Net Income. Both the allowance and the adjustment to net income can be reversed if conditions change. Our policy for credit impairment within the debt securities portfolio is based upon a number of factors, including but not limited to, the financial condition of the underlying issuer, the ability of the issuer to meet contractual obligations, the likelihood of the security’s ability to recover any decline in its estimated fair value and whether management intends to sell the security or if it is more likely than not that management will be required to sell the investment security prior to the security’s recovery of any decline in its estimated fair value. Realized gains and losses on the sale of these securities are determined using the specific-identification method and are recorded within noninterest income in the Consolidated Statements of Net Income. Bond premiums are amortized to the call date and bond discounts are accreted to the maturity date, both on a level yield basis. Equity securities are measured at fair value with net unrealized gains and losses recognized in other noninterest income in the Consolidated Statements of Net Income.
Loans Held for Sale	Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. If a loan is transferred from the loan portfolio to the held for sale category, any write-down in the carrying amount of the loan at the date of transfer is recorded as a charge-off against the ACL. Subsequent declines in fair value are recognized as a charge to other noninterest income. When a loan is placed in the held for sale category, we stop amortizing the related deferred fees and costs. The remaining unamortized fees and costs are recognized as part of the cost basis of the loan at the time it is sold. Gains and losses on sales of mortgage loans held for sale are included in mortgage banking in noninterest income in the Consolidated Statements of Net Income.
Loans, Nonaccrual or Nonperforming Loans, and Troubled Debt Restructurings	Loans Loans are reported at the principal amount outstanding net of unearned income, unamortized premiums or discounts and deferred origination fees and costs. We defer certain nonrefundable loan origination and commitment fees. Accretion of discounts and amortization of premiums on loans are included in interest income in the Consolidated Statements of Net Income. Loan origination fees and direct loan origination costs are deferred and amortized as an adjustment of loan yield over the respective lives of the loans without consideration of anticipated prepayments. If a loan is paid off, the remaining unaccreted or unamortized net origination fees and costs are immediately recognized into income or expense. Interest is accrued and interest income is recognized on loans as earned. Acquired loans are recorded at fair value on the date of acquisition with no carryover of the related ACL. Determining the fair value of the acquired loans involves estimating the principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. In estimating the fair value of our acquired loans, we consider a number of factors including the loan term, internal risk rating, delinquency status, prepayment rates, recovery periods, estimated value of the underlying collateral and the current interest rate environment. Closed-end installment loans, amortizing loans secured by real estate and any other loans with payments scheduled monthly are reported past due when the borrower is in arrears two or more monthly payments. Other multi-payment obligations with payments scheduled other than monthly are reported past due when one scheduled payment is due and unpaid for 30 days or more. Generally, consumer loans are charged off against the ACL upon the loan reaching 90 days past due. Commercial loans are charged off as management becomes aware of facts and circumstances that raise doubt as to the collectability of all or a portion of the principal and when we believe a confirmed loss exists. Nonaccrual or Nonperforming Loans We stop accruing interest on a loan when the borrower’s payment is 90 days past due. Loans are also placed on nonaccrual status when we have doubt about the borrower’s ability to comply with contractual repayment terms, even if payment is not past due. When the interest accrual is discontinued, all unpaid accrued interest is reversed against interest income. As a general rule, a nonaccrual loan may be restored to accrual status when its principal and interest is paid current and the bank expects repayment of the remaining contractual principal and interest, or when the loan otherwise becomes well secured and in the process of collection. Troubled Debt Restructurings Troubled debt restructurings, or TDRs, are loans where we, for economic or legal reasons related to a borrower’s financial difficulties, grant a concession to the borrower. We strive to identify borrowers with financial difficulty early and work with them to come to a mutual resolution to modify the terms of their loan before the loan reaches nonaccrual status. These modified terms generally include extensions of maturity dates at a stated interest rate lower than the current market rate for a new loan with similar risk characteristics, reductions in contractual interest rates or principal deferment. While unusual, there may be instances of principal forgiveness. These modifications are generally for longer term periods that would not be considered insignificant. Additionally, we classify loans where the debt obligation has been discharged through a Chapter 7 Bankruptcy and not reaffirmed as TDRs. We individually evaluate all substandard commercial loans that have experienced a forbearance or change in terms agreement, and all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan, to determine if they should be designated as TDRs. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring.
Allowance for Credit Losses and Allowance for Loan Losses	Allowance for Credit Losses The ACL is a valuation reserve established and maintained by charges against operating income and is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the ACL when they are deemed uncollectible. The ACL is an estimate of expected credit losses, measured over the contractual life of a loan, that considers our historical loss experience, current conditions and forecasts of future economic conditions. Determination of an appropriate ACL is inherently subjective and may have significant changes from period to period. The methodology for determining the ACL has two main components: evaluation of expected credit losses for certain groups of homogeneous loans that share similar risk characteristics and evaluation of loans that do not share risk characteristics with other loans. The ACL for homogeneous loans is calculated using a life-time loss rate methodology with both a quantitative and a qualitative analysis that is applied on a quarterly basis. The ACL model is comprised of six distinct portfolio segments: 1) Construction, 2) Commercial Real Estate, or CRE, 3) Commercial and Industrial, or C&I, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. Each segment has a distinct set of risk characteristics monitored by management. We further evaluate the ACL at a disaggregated level which includes type of collateral and our internal risk rating system for the commercial segments and type of collateral, lien position, and FICO score, for the consumer segments. Historical credit loss experience is the basis for the estimation of expected credit losses. Our quantitative model uses historic data back to the second quarter of 2009. We apply historical loss rates to pools of loans with similar risk characteristics. After consideration of the historic loss calculation, management applies qualitative adjustments to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information at the balance sheet date. Our reasonable and supportable forecast adjustment is based on the unemployment forecast and management judgment. For periods beyond our two year reasonable and supportable forecast, we revert to historical loss rates utilizing a straight-line method over a one year reversion period. The qualitative adjustments for current conditions are based upon changes in lending policies and practices, experience and ability of lending staff, quality of the bank’s loan review system, value of underlying collateral, the existence of and changes in concentrations, other external factors and segment specific risks. These modified historical loss rates are multiplied by the outstanding principal balance of each loan to calculate a required reserve. A similar process is employed to calculate a reserve assigned to off-balance sheet commitments, specifically unfunded loan commitments and letters of credit, and any needed reserve is recorded in other liabilities. The ACL for individual loans begins with the use of normal credit review procedures to identify whether a loan no longer shares similar risk characteristics with other pooled loans and therefore, should be individually assessed. We evaluate all commercial loans greater than $1.0 million that meet the following criteria: 1) when it is determined that foreclosure is probable, 2) substandard, doubtful and nonperforming loans when repayment is expected to be provided substantially through the operation or sale of the collateral, 3) any commercial TDR, or any loan reasonably expected to become a TDR whether on accrual or nonaccrual status and 4) when it is determined by management that a loan does not share similar risk characteristics with other loans. Specific reserves are established based on the following three acceptable methods for measuring the ACL: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral when the loan is collateral dependent. Our individual loan evaluations consist primarily of the fair value of collateral method because most of our loans are collateral dependent. Collateral values are discounted to consider disposition costs when appropriate. A specific reserve is established or a charge-off is taken if the fair value of the loan is less than the loan balance. Our ACL Committee meets quarterly to verify the overall appropriateness of the ACL. Additionally, on an annual basis, the ACL Committee meets to validate our ACL methodology. This validation includes reviewing the loan segmentation, critical model assumptions, forecast and the qualitative framework. As a result of this ongoing monitoring process, we may make changes to our ACL to be responsive to the economic environment. Allowance for Loan Losses Prior to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, we calculated our ALL using an incurred loan loss methodology. Refer to our Annual Report on Form 10-K for the year ended December 31, 2020 for our Allowance for Loan Losses policy. We maintain an ACL at a level determined to be adequate to absorb estimated expected credit losses within the loan portfolio over the contractual life of an instrument that considers our historical loss experience, current conditions and forecasts of future economic conditions as of the balance sheet date. We develop and document a systematic ACL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. The following are key risks within each portfolio segment: CRE —Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, retail, multifamily and health care. The primary sources of repayment for these loans are the operations of the individual projects and global cash flows of the debtors. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied. C&I —Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. The primary source of repayment for these loans is cash flow from the operations of the company. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often does not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt. Commercial Construction —Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer. Business Banking —Commercial loans made to small businesses that are standard, non-complex products evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards that meet small business market customers’ needs. The business banking portfolio is monitored by utilizing a standard and closely managed process focusing on behavioral and performance criteria. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and business. Consumer Real Estate —Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt. Other Consumer —Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values. Management monitors various credit quality indicators for the commercial, business banking and consumer loan portfolios, including changes in risk ratings, nonperforming status and delinquency on a monthly basis. We monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard. Our risk ratings are consistent with regulatory guidance and are as follows: Pass —The loan is currently performing and is of high quality. Special Mention —A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Substandard —A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Doubtful —Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions, and values, highly questionable and improbable.
Bank Owned Life Insurance	Bank Owned Life Insurance We have purchased life insurance policies on certain executive officers and employees. We receive the cash surrender value of each policy upon its termination or benefits are payable to us upon the death of the insured. Changes in net cash surrender value are recognized in noninterest income in the Consolidated Statements of Net Income.
Premises and Equipment	Premises and Equipment Premises and equipment, including leasehold improvements, are stated at cost less accumulated depreciation. Maintenance and repairs are charged to expense as incurred, while improvements that extend an asset’s useful life are capitalized and depreciated over the estimated remaining life of the asset. Depreciation expense is computed by the straight-line method for financial reporting purposes and accelerated methods for income tax purposes over the estimated useful lives of the particular assets. Depreciation expense is included in occupancy on the Consolidated Statements of Net Income. Management reviews long-lived assets using events and circumstances to determine if and when an asset is evaluated for recoverability. The estimated useful lives for the various asset categories are as follows: 1) Land and Land Improvements Non-depreciating assets 2) Buildings 25 years 3) Furniture and Fixtures 5 years 4) Computer Equipment and Software 5 years or term of license 5) Other Equipment 5 years 6) Vehicles 5 years 7) Leasehold Improvements Lesser of estimated useful life of the asset (generally 15 years unless established otherwise) or the remaining term of the lease, including renewal options in the lease that are reasonably assured of exercise
Right-of-Use Assets and Lease Liabilities	Right-of-Use Assets and Lease Liabilities We determine if a contract is or contains a lease at inception. Leases are classified as either finance or operating leases. We recognize leases on our Consolidated Balance Sheets as right-of-use, or ROU, assets and related lease liabilities. Finance ROU assets are included in property and equipment and related finance lease liabilities are included in long-term borrowings.
Restricted Investment in Bank Stock	Restricted Investment in Bank Stock FHLB stock is carried at cost and evaluated for impairment based on the ultimate recoverability of the par value. We hold FHLB stock because we are a member of the FHLB of Pittsburgh. The FHLB requires members to purchase and hold a specified level of FHLB stock based upon on the member's asset value, level of borrowings and participation in other programs offered. Stock in the FHLB is non-marketable and is redeemable at the discretion of the FHLB. Members do not purchase stock in the FHLB for the same reasons that traditional equity investors acquire stock in an investor-owned enterprise. Rather, members purchase stock to obtain access to the low-cost products and services offered by the FHLB. Unlike equity securities of traditional for-profit enterprises, the stock of the FHLB does not provide its holders with an opportunity for capital appreciation because, by regulation, FHLB stock can only be purchased, redeemed and transferred at par value. Both cash and stock dividends are reported as income in taxable investment securities in the Consolidated Statements of Net Income. FHLB stock is evaluated for impairment when events and circumstance indicate that impairment could exist. Atlantic Community Bankers’ Bank, or ACBB, stock is carried at cost and evaluated for impairment based on the ultimate recoverability of the carrying value. We do not currently use their membership products and services. We acquired ACBB stock through various mergers of banks that were ACBB members. ACBB stock is evaluated for impairment when events and circumstance indicate that impairment could exist.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets As a result of acquisitions, we have recorded goodwill and identifiable intangible assets in our Consolidated Balance Sheets. Goodwill represents the excess of the purchase price over the fair value of net assets acquired. We have one reporting unit, Community Banking. Existing goodwill relates to value inherent in the Community Banking reporting unit and that value is dependent upon our ability to provide quality, cost-effective services in the face of competition from other market participants. This ability relies upon continuing investments in processing systems, the development of value-added service features and the ease of use of our services. As such, goodwill value is supported ultimately by profitability that is driven by the volume of business transacted. A decline in earnings as a result of a lack of growth or the inability to deliver cost-effective services over sustained periods can lead to impairment of goodwill, which could adversely impact our earnings in the period in which impairment occurs. The carrying value of goodwill is tested annually for impairment each October 1st or more frequently if events and circumstances indicate that it may be impaired. We test for impairment by comparing the fair value of our Community Banking reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. Determining the fair value of a reporting unit is judgmental and involves the use of significant estimates and assumptions. The fair value of the reporting unit is determined by using both a discounted cash flow model and a market based model. The discounted cash flow model has many assumptions including future earnings projections, a long-term growth rate and discount rate. The market based model calculates fair value based on observed price multiples for similar companies. The fair values of each method are then weighted based on relevance and reliability in the current economic environment. We determine the amount of identifiable intangible assets based upon independent core deposit and insurance contract valuations at the time of acquisition. Intangible assets with finite useful lives, consisting primarily of core deposit and customer list intangibles, are amortized using straight-line or accelerated methods over their estimated weighted average useful lives, ranging from 10 to 20 years. Intangible assets with finite useful lives are evaluated for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. No such events or changes in circumstances occurred during the years ended December 31, 2021 and 2020.
Variable Interest Entities	Variable Interest Entities Variable interest entities, or VIEs, are legal entities that generally either do not have equity investors with voting rights or that have equity investors that do not provide sufficient financial resources for the entity to support its activities. When an enterprise has both the power to direct the economic activities of the VIE and the obligation to absorb losses of the VIE or the right to receive benefits of the VIE, the entity has a controlling financial interest in the VIE. A VIE often holds financial assets, including loans, receivables or other property. The company with a controlling financial interest, the primary beneficiary, is required to consolidate the VIE into its Consolidated Balance Sheets. S&T has three wholly-owned trust subsidiaries, STBA Capital Trust I, DNB Capital Trust I and DNB Capital Trust II, or the Trusts, for which it does not absorb a majority of expected losses or receive a majority of the expected residual returns. The DNB Capital Trust I and DNB Capital Trust II were acquired with the DNB merger. At inception, these Trusts issued floating rate trust preferred securities to the Trustees and used the proceeds from the sale to invest in junior subordinated debt securities issued by us. The Trusts pay dividends on the trust preferred securities at the same rate as the interest we pay on the junior subordinated debt held by the Trusts. The Trusts are VIEs with the third-party investors as their primary beneficiaries, and accordingly, the Trusts and their net assets are not included in our Consolidated Financial Statements. However, the junior subordinated debt securities issued by S&T are included in our Consolidated Balance Sheets.
Joint Ventures	Joint Ventures We have made investments directly in Low Income Housing Tax Credit, or LIHTC, partnerships formed with third parties. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. These investments are amortized over a maximum of 10 years, which represents the period over which the tax credits will be utilized. Our investments in Low Income Housing Partnerships, or LIHPs, represent unconsolidated variable interest entities, or VIEs, and the assets and liabilities of the partnerships are not recorded on our balance sheet. We have determined that we are not the primary beneficiary of these VIEs because we do not have the power to direct the activities that most significantly impact the economic performance of the partnership and have both the obligation to absorb expected losses and the right to receive benefits. We use the cost method to account for these partnerships. These investments are recorded in other assets on our balance sheet. Amortization expense is included in other noninterest expense in the Consolidated Statements of Net Income.
OREO and Other Repossessed Assets	OREO and Other Repossessed Assets OREO and other repossessed assets are included in other assets in the Consolidated Balance Sheets and are comprised of properties acquired through foreclosure proceedings or acceptance of a deed in lieu of a foreclosure. At the time of foreclosure or acceptance of a deed in lieu of foreclosure, these properties are recorded at the lower of the recorded investment in the loan or fair value less cost to sell. Loan losses arising from the acquisition of any such property initially are charged against the ACL. Subsequently, these assets are carried at the lower of carrying value or current fair value less cost to sell. Gains or losses realized upon disposition of these assets are recorded in other noninterest income or expenses in the Consolidated Statements of Net Income.
Mortgage Servicing Rights	Mortgage Servicing Rights Mortgage servicing rights, or MSRs, are recognized as separate assets when a mortgage loan is sold. MSRs represents the estimated fair value of future net cash flows expected to be realized for performing the servicing activities. The fair value of the MSRs is estimated by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. Increases in mortgage loan prepayments reduce estimated future net servicing cash flows because the life of the underlying loan is reduced. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into mortgage banking in noninterest income in the Consolidated Statements of Net Income in proportion to, and over the period of, the estimated future net servicing income of the underlying mortgage loans. MSRs are regularly evaluated for impairment based on the estimated fair value of those rights. MSRs are stratified by certain risk characteristics, primarily loan term and note rate. If temporary impairment exists within a risk stratification tranche, a valuation allowance is established through a charge to income equal to the amount by which the carrying value exceeds the estimated fair value. If it is later determined that all or a portion of the temporary impairment no longer exists for a particular tranche, the valuation allowance is reduced.
Derivative Financial Instruments	Derivative Financial Instruments Interest Rate Swaps In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates. Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial. Derivatives contain an element of credit risk, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved in accordance with our credit policy. Interest rate swaps are considered derivatives but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Net Income. Interest Rate Lock Commitments and Forward Sale Contracts In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for a period of 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Net Income.
Allowance for Unfunded Commitments	Allowance for Unfunded Commitments In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event the customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The allowance for unfunded commitments is determined using a similar methodology as our ACL methodology except that we apply a probability to fund assumption. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The reserve is calculated by applying historical loss rates and qualitative adjustments to our unfunded commitments. The provision for unfunded commitments is included in the provision for credit losses on the Consolidated Statements of Net Income.
Treasury Stock	Treasury Stock The repurchase of our common stock is recorded at cost. At the time of reissuance, the treasury stock account is reduced using the average cost method. Gains and losses on the reissuance of common stock are recorded in additional paid-in capital, to the extent additional paid-in capital from previous treasury share transactions exists. Any deficiency is charged to retained earnings.
Revenue Recognition - Contracts with Customers	Revenue Recognition - Contracts with Customers We earn revenue from contracts with our customers when we have completed our performance obligations and recognize that revenue when services are provided to our customers. Our contracts with customers are primarily in the form of account agreements. Generally, our services are transferred at a point in time in response to transactions initiated and controlled by our customers under service agreements with an expected duration of one year or less. Our customers have the right to terminate their service agreements at any time. We do not defer incremental direct costs to obtain contracts with customers that would be amortized in one year or less. These costs are primarily salaries and employee benefits recognized as expense in the period incurred. Service charges on deposit accounts - We recognize monthly service charges for both commercial and personal banking customers based on account fee schedules. Our performance obligation is generally satisfied and the related revenue recognized at a point in time or over time when the services are provided. Other fees are earned based on specific transactions or customer activity within the customers' deposit accounts. These are earned at the time the transaction or customer activity occurs. Debit and credit card services - Interchange fees are earned whenever debit and credit cards are processed through third-party card payment networks. ATM fees are based on transactions by our customers' and other customers' use of our ATMs or other ATMs. Debit and credit card revenue is recognized at a point in time when the transaction is settled. Our performance obligation to our customers is generally satisfied and the related revenue is recognized at a point in time when the service is provided. Third-party service contracts include annual volume and marketing incentives which are recognized over a period of twelve months when we meet thresholds as stated in the service contract. Wealth management services - Wealth management services are primarily comprised of fees earned from the management and administration of trusts, assets under administration and other financial advisory services. Generally, wealth management fees are earned over a period of time between monthly and annually, per the related fee schedules. Our performance obligations with our customers are generally satisfied when we provide the services as stated in the customers' agreements. The fees are based on a fixed amount or a scale based on the level of services provided or amount of assets under management. Other fee revenue - Other fee revenue includes a variety of other traditional banking services such as, electronic banking fees, letters of credit origination fees, wire transfer fees, money orders, treasury checks, checksale fees and transfer fees. Our performance obligations are generally satisfied at a point in time and fee revenue is recognized when the services are provided or the transaction is settled.
Wealth Management Fees	Wealth Management Fees Assets held in a fiduciary capacity by our subsidiary bank, S&T Bank, are not our assets and are therefore not included in our Consolidated Financial Statements. Wealth management fee income is reported in the Consolidated Statements of Net Income on an accrual basis.
Stock-Based Compensation	Stock-Based CompensationStock-based compensation includes restricted stock which is measured using the fair value method of accounting. The grant date fair value is recognized over the period during which the recipient is required to provide service in exchange for the award. Compensation expense for time-based restricted stock is recognized ratably over the period of service, generally the entire vesting period, based on fair value on the grant date. Compensation expense for performance-based restricted stock is recognized ratably over the remaining vesting period once the likelihood of meeting the performance measure is probable, based on the fair value on the grant date. We estimate expected forfeitures when stock-based awards are granted and record compensation expense only for awards that are expected to vest.
Pensions	Pensions The expense for S&T Bank’s qualified and nonqualified defined benefit pension plans is actuarially determined using the projected unit credit actuarial cost method. It requires us to make economic assumptions regarding future interest rates and asset returns and various demographic assumptions. We estimate the discount rate used to measure benefit obligations by applying the projected cash flow for future benefit payments to a yield curve of high-quality corporate bonds available in the marketplace and by employing a model that matches bonds to our pension cash flows. The expected return on plan assets is an estimate of the long-term rate of return on plan assets, which is determined based on the current asset mix and estimates of return by asset class. We recognize in the Consolidated Balance Sheets an asset for the plan’s overfunded status or a liability for the plan’s underfunded status. Gains or losses related to changes in benefit obligations or plan assets resulting from experience different from that assumed are recognized as other comprehensive income (loss) in the period in which they occur. To the extent that such gains or losses exceed 10 percent of the greater of the projected benefit obligation or plan assets, they are recognized as a component of pension costs over the future service periods of actively employed plan participants. The funding policy for the qualified plan is to contribute an amount each year that is at least equal to the minimum required contribution, but not more than the maximum amount permissible for taxable plan sponsors. Our nonqualified plans are unfunded. On January 25, 2016, the Board of Directors approved an amendment to freeze benefit accruals under the qualified and nonqualified defined benefit pension plans effective March 31, 2016. As a result, no additional benefits are earned by participants in those plans based on service or pay after March 31, 2016. The plan was previously closed to new participants effective December 31, 2007.
Marketing Costs	Marketing Costs We expense all marketing-related costs, including advertising costs, as incurred.
Income Taxes	Income Taxes We estimate income tax expense based on amounts expected to be owed to the tax jurisdictions where we conduct business. On a quarterly basis, management assesses the reasonableness of our effective tax rate based upon our current estimate of the amount and components of net income, tax credits and the applicable statutory tax rates expected for the full year. We classify interest and penalties as an element of tax expense. Deferred income tax assets and liabilities are determined using the asset and liability method and are reported in other assets or other liabilities, as appropriate, in the Consolidated Balance Sheets. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax basis of assets and liabilities and recognizes enacted changes in tax rate and laws. When deferred tax assets are recognized, they are subject to a valuation allowance based on management’s judgment as to whether realization is more likely than not. Accrued taxes represent the net estimated amount due to taxing jurisdictions and are reported in other assets or other liabilities, as appropriate, in the Consolidated Balance Sheets. We evaluate and assess the relative risks and appropriate tax treatment of transactions and filing positions after considering statutes, regulations, judicial precedent and other information and maintain tax accruals consistent with the evaluation of these relative risks and merits. Changes to the estimate of accrued taxes occur periodically due to changes in tax rates, interpretations of tax laws, the status of examinations being conducted by taxing authorities and changes to statutory, judicial and regulatory guidance. These changes, when they occur, can affect deferred taxes, accrued taxes, and the current period’s income tax expense and can be significant to our operating results. Tax positions are recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50 percent likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.
Earnings Per Share	Earnings Per Share Basic earnings per share, or EPS, is calculated using the two-class method to determine income allocated to common shareholders. Unvested share-based payment awards that contain nonforfeitable rights to dividends are considered participating securities under the two-class method. Income allocated to common shareholders is then divided by the weighted average number of common shares outstanding during the period. Potentially dilutive securities are excluded from the basic EPS calculation. Diluted EPS is calculated under the more dilutive of either the treasury stock method or the two-class method. Under the treasury stock method, the weighted average number of common shares outstanding is increased by the potentially dilutive common shares. For the two-class method, diluted EPS is calculated for each class of shareholders using the weighted average number of shares attributed to each class. Potentially dilutive common shares are related to restricted stock.
Recently Adopted Accounting Standards Updates, or ASU or Update and Accounting Standards Issued But Not Yet Adopted	Recently Adopted Accounting Standards Updates, or ASU or Update Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The amendments in this ASU simplify the accounting for income taxes by removing certain exceptions and improve the consistent application of GAAP by clarifying and amending other existing guidance. We adopted this ASU on January 1, 2021. The amendments in this ASU did not impact our Consolidated Financial Statements. Accounting Standards Issued But Not Yet Adopted Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments in this ASU provide optional guidance for a limited period of time to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting. The amendments provide optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. Modified contracts that meet certain scope guidance are eligible for relief from the modification accounting requirements in US GAAP. The optional guidance generally allows for the modified contract to be accounted for as a continuation of the existing contract and does not require contract remeasurement at the modification date or reassessment of a previous accounting determination. The amendments in this ASU are effective as of March 12, 2020 through December 31, 2022. We have established a committee to guide our transition from LIBOR and have begun efforts to transition to alternative rates consistent with industry timelines. We have identified products that utilize LIBOR and are revising fallback language to facilitate the transition to alternative reference rates. ASU 2020-04 is not expected to have a material impact on our Consolidated Financial Statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Estimated Useful Lives for Various Asset	The estimated useful lives for the various asset categories are as follows: 1) Land and Land Improvements Non-depreciating assets 2) Buildings 25 years 3) Furniture and Fixtures 5 years 4) Computer Equipment and Software 5 years or term of license 5) Other Equipment 5 years 6) Vehicles 5 years 7) Leasehold Improvements Lesser of estimated useful life of the asset (generally 15 years unless established otherwise) or the remaining term of the lease, including renewal options in the lease that are reasonably assured of exercise

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2021
Business Combination and Asset Acquisition [Abstract]
Summary of Consideration, Assets Acquired and Liabilities Assumed	The following table presents the fair value adjustments and the measurement period adjustments as of the dates presented: November 30, 2019 November 30, 2020 As Recorded by DNB Fair Value Adjustments As Recorded by S&T Measurement Period Adjustments As Recorded by S&T Fair Value of Assets Acquired Cash and cash equivalents $ 64,119 $ — $ 64,119 $ — $ 64,119 Securities and other investments 108,715 183 108,898 — 108,898 Loans 917,127 (8,143) 908,984 (2,377) 906,607 Allowance for credit losses (6,487) 6,487 — — — Goodwill 15,525 (15,525) — — — Premises and equipment 6,782 8,090 14,872 — 14,872 Accrued interest receivable 4,138 — 4,138 — 4,138 Deferred income taxes 2,017 (3,298) (1,281) 311 (970) Core deposits and other intangible assets 269 (269) — — — Other assets 24,883 (4,278) 20,605 (116) 20,489 Total Assets Acquired 1,137,088 (16,753) 1,120,335 (2,182) 1,118,153 Fair Value of Liabilities Assumed Deposits 966,263 1,002 967,265 — 967,265 Borrowings 37,617 (276) 37,341 (257) 37,084 Accrued interest payable and other liabilities 11,157 (3,184) 7,973 (122) 7,851 Total Liabilities Assumed 1,015,037 (2,458) 1,012,579 (379) 1,012,200 Total Net Assets Acquired $ 122,051 $ (14,295) $ 107,756 $ (1,803) $ 105,953 Core Deposit Intangible Asset $ 7,288 $ — $ 7,288 Wealth Management Intangible Asset 1,772 — 1,772 Total Fair Value of Net Assets Acquired and Identified $ 116,816 $ (1,803) $ 115,013 Consideration Paid Cash $ 360 $ — $ 360 Common stock 200,631 — 200,631 Fair Value of Total Consideration $ 200,991 $ — $ 200,991 Goodwill $ 84,175 $ 1,803 $ 85,978

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share [Abstract]
Reconciles Numerators and Denominators of Basic Earnings Per Share and Diluted Earnings Per Share	The following table reconciles the numerators and denominators of basic and diluted EPS: Years ended December 31, (dollars in thousands, except share and per share data) 2021 2020 2019 Numerators for Earnings per Common Share—Basic and Diluted: Net income $ 110,343 $ 21,040 $ 98,234 Less: Income allocated to participating shares 492 68 260 Net Income Allocated to Common Shareholders $ 109,851 $ 20,972 $ 97,974 Denominators: Weighted Average Common Shares Outstanding—Basic 39,050,241 39,070,439 34,628,191 Add: Average participating shares outstanding 2,720 2,780 51,287 Denominator for Diluted 39,052,961 39,073,219 34,679,478 Earnings per common share—basic $ 2.81 $ 0.54 $ 2.84 Earnings per common share—diluted $ 2.81 $ 0.53 $ 2.82 Restricted stock considered anti-dilutive excluded from dilutive potential common shares 793 1,242 12,686

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at December 31, 2021 and 2020. Interest rate lock commitments to borrowers were transferred from Level 2 to Level 3 during the year ended December 31, 2020 due to pull-through factors being a significant unobservable input. December 31, 2021 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Debt securities available-for-sale: U.S. Treasury securities $ 95,327 $ — $ — $ 95,327 Obligations of U.S. government corporations and agencies — 70,348 — 70,348 Collateralized mortgage obligations of U.S. government corporations and agencies — 270,294 — 270,294 Residential mortgage-backed securities of U.S. government corporations and agencies — 56,793 — 56,793 Commercial mortgage-backed securities of U.S. government corporations and agencies — 341,300 — 341,300 Corporate obligations — 500 — 500 Obligations of states and political subdivisions — 75,089 — 75,089 Total Debt Securities Available-for-Sale 95,327 814,324 — 909,651 Marketable equity securities 1,061 81 — 1,142 Total Securities 96,388 814,405 — 910,793 Securities held in a deferred compensation plan 10,230 — — 10,230 Derivative financial assets: Interest rate swaps — 33,528 — 33,528 Interest rate lock commitments — — 401 401 Forward sale contracts — — 4 4 Total Assets $ 106,618 $ 847,933 $ 405 $ 954,956 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 33,631 $ — $ 33,631 Total Liabilities $ — $ 33,631 $ — $ 33,631 December 31, 2020 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Debt securities available-for-sale: U.S. Treasury securities $ 10,282 $ — $ — $ 10,282 Obligations of U.S. government corporations and agencies — 82,904 — 82,904 Collateralized mortgage obligations of U.S. government corporations and agencies — 209,296 — 209,296 Residential mortgage-backed securities of U.S. government corporations and agencies — 67,778 — 67,778 Commercial mortgage-backed securities of U.S. government corporations and agencies — 273,681 — 273,681 Corporate obligations — 2,025 — 2,025 Obligations of states and political subdivisions — 124,427 — 124,427 Total Debt Securities Available-for-Sale 10,282 760,111 — 770,393 Marketable equity securities 3,228 72 — 3,300 Total Securities 13,510 760,183 — 773,693 Securities held in a deferred compensation plan 6,794 — — 6,794 Derivative financial assets: Interest rate swaps — 78,319 — 78,319 Interest rate lock commitments — — 2,900 2,900 Total Assets $ 20,304 $ 838,502 $ 2,900 $ 861,706 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 79,033 $ — $ 79,033 Forward sale contracts — 385 — 385 Total Liabilities $ — $ 79,418 $ — $ 79,418
Assets Measured at Fair Value on Nonrecurring Basis by Significant Unobservable Inputs	For Level 3 assets measured at fair value on a nonrecurring basis at December 31, 2021 and 2020, the significant unobservable inputs used in the fair value measurements were as follows: December 31, 2021 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (dollars in thousands) Loans individually evaluated $ 16,004 Collateral method Appraisal adjustment 0% - 20% 4.48% Discounted cash flow method Discount rate 10% 19% 10.46% Other real estate owned 1,011 Collateral method Appraisal adjustment 2.53% 2.53% Mortgage servicing rights — Discounted cash flow method NA NA NA Loans held for sale — Collateral method NA NA NA Total Assets $ 17,015 (1) Weighted averages for loans individually evaluated were weighted by loan amounts. (2) Weighted averages for other real estate owned were weighted by OREO balances. December 31, 2020 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans individually evaluated $ 64,286 Collateral method Appraisal adjustment 0% - 12% 7.70% Discounted cash flow method Discount rate —% - —% —% Other real estate owned 600 Collateral method Appraisal adjustment 21.80% 21.80% Mortgage servicing rights 4,976 Discounted cash flow method Discount rate 9.24% - 12.55% 9.42% Constant prepayment rates 8.82% - 14.58% 13.37% Loans held for sale 586 Collateral method NA NA NA Total Assets $ 70,448 (1) Weighted averages for loans individually evaluated were weighted by loan amounts. (2) Weighted averages for other real estate owned were weighted by OREO balances. (3) Weighted averages for mortgage services rights discount rate and prepayment rates were weighted based on note rate tranches.
Carrying Values and Fair Values of Financial Instruments	The carrying values and fair values of our financial instruments at December 31, 2021 and 2020 are presented in the following tables: Fair Value Measurements at December 31, 2021 (dollars in thousands) Carrying Value (1) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 922,215 $ 922,215 $ 922,215 $ — $ — Securities 910,793 910,793 96,388 814,405 — Loans held for sale 1,522 1,522 — — 1,522 Portfolio loans, net 6,901,414 6,815,468 — — 6,815,468 Collateral receivable 37,363 37,363 37,363 — — Securities held in a deferred compensation plan 10,230 10,230 10,230 — — Mortgage servicing rights 7,677 7,677 — — 7,677 Interest rate swaps 33,528 33,528 — 33,528 — Interest rate lock commitments 401 401 — — 401 Forward sale contracts 4 4 — — 4 LIABILITIES Deposits $ 7,996,524 $ 7,992,942 $ 6,908,453 $ 1,084,489 — Securities sold under repurchase agreements 84,491 84,491 84,491 — — Short-term borrowings — — — — — Long-term borrowings 22,430 22,678 4,300 18,378 — Junior subordinated debt securities 54,393 54,393 54,393 — — Interest rate swaps 33,631 33,631 — 33,631 — (1) As reported in the Consolidated Balance Sheets Fair Value Measurements at December 31, 2020 (dollars in thousands) Carrying Value (1) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 229,666 $ 229,666 $ 229,666 $ — $ — Securities 773,693 773,693 13,510 760,183 — Loans held for sale 18,528 18,528 — — 18,528 Portfolio loans, net 7,108,248 7,028,446 — — 7,028,446 Securities held in a deferred compensation plan 77,936 77,936 77,936 — — Mortgage servicing rights 6,794 6,794 6,794 — — Interest rate swaps 4,976 4,976 — — 4,976 Interest rate lock commitments 78,319 78,319 — 78,319 — Forward sale contracts 2,900 2,900 — — 2,900 LIABILITIES Deposits $ 7,420,538 $ 7,422,894 $ 6,033,075 $ 1,389,819 $ — Securities sold under repurchase agreements 65,163 65,163 65,163 — — Short-term borrowings 75,000 75,000 75,000 — — Long-term borrowings 23,681 24,545 4,494 20,051 — Junior subordinated debt securities 64,083 64,083 64,083 — — Interest rate swaps 79,033 79,033 — 79,033 — Forward sale contracts 385 385 — 385 — (1) As reported in the Consolidated Balance Sheets

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of Marketable Securities	The following table presents the fair values of our securities portfolio at the dates presented: December 31, (dollars in thousands) 2021 2020 Debt securities available-for-sale $ 909,651 $ 770,393 Marketable equity securities 1,142 3,300 Total Securities $ 910,793 $ 773,693
Schedule of Composition of Securities	The following tables present the amortized cost and fair value of debt securities available-for-sale as of December 31, 2021 and December 31, 2020: December 31, 2021 December 31, 2020 (dollars in thousands) Amortized Gross Gross Fair Value Amortized Gross Gross Fair Value U.S. Treasury securities $ 95,954 $ 115 $ (742) $ 95,327 $ 9,980 $ 302 $ — $ 10,282 Obligations of U.S. government corporations and agencies 68,599 1,749 — 70,348 78,755 4,149 — 82,904 Collateralized mortgage obligations of U.S. government corporations and agencies 270,696 2,408 (2,810) 270,294 202,975 6,410 (89) 209,296 Residential mortgage-backed securities of U.S. government corporations and agencies 57,029 392 (628) 56,793 66,960 818 — 67,778 Commercial mortgage-backed securities of U.S. government corporations and agencies 336,918 5,969 (1,587) 341,300 258,875 14,806 — 273,681 Corporate Obligations 500 — — 500 2,021 5 (1) 2,025 Obligations of states and political subdivisions 70,539 4,550 — 75,089 117,439 6,988 — 124,427 Total Debt Securities Available-for-Sale $ 900,235 $ 15,183 $ (5,767) $ 909,651 $ 737,005 $ 33,478 $ (90) $ 770,393
Schedule of Gross and Net Realized Gains and Losses on Sale of Securities	The following table shows the composition of gross and net realized gains and losses for the periods presented: Years ended December 31, (dollars in thousands) 2021 2020 2019 Gross realized gains $ 29 $ 219 $ 41 Gross realized losses — (77) (67) Net Realized Gains/(Losses) $ 29 $ 142 $ (26)
Schedule of Temporally Impaired Debt Securities	The following tables present the fair value and the age of gross unrealized losses on debt securities available-for-sale by investment category as of the dates presented: December 31, 2021 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number Fair Unrealized Number Fair Unrealized Number Fair Unrealized U.S. Treasury securities 8 $ 85,221 $ (742) — $ — $ — 8 $ 85,221 $ (742) Collateralized mortgage obligations of U.S. government corporations and agencies 12 141,204 (2,436) 1 8,933 (374) 13 150,137 (2,810) Residential mortgage-backed securities of U.S. government corporations and agencies 3 46,042 (628) — — — 3 46,042 (628) Commercial mortgage-backed securities of U.S. government corporations and agencies 7 100,032 (1,587) — — — 7 100,032 (1,587) Corporate Obligations — — — — — — — — — Total 30 $ 372,499 $ (5,393) 1 $ 8,933 $ (374) 31 $ 381,432 $ (5,767) December 31, 2020 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number Fair Unrealized Number Fair Unrealized Number Fair Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Collateralized mortgage obligations of U.S. government corporations and agencies 2 35,697 (89) — — — 2 35,697 (89) Residential mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Commercial mortgage-backed securities of U.S. government corporations and agencies — — — — — — Corporate Obligations 1 499 (1) — — — 1 499 (1) Total 3 $ 36,196 $ (90) — $ — $ — 3 $ 36,196 $ (90)
Unrealized Gain (Loss) on Investments	The following table presents net unrealized gains and losses, net of tax, on debt securities available-for-sale included in accumulated other comprehensive income/(loss), for the periods presented: December 31, 2021 December 31, 2020 (dollars in thousands) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains (Losses) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains (Losses) Total unrealized gains/(losses) on debt securities available-for-sale $ 15,183 $ (5,767) $ 9,416 $ 33,478 $ (90) $ 33,388 Income tax (expense) benefit (3,215) 1,221 (1,994) (7,128) 19 (7,109) Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss) $ 11,968 $ (4,546) $ 7,422 $ 26,350 $ (71) $ 26,279
Amortized Cost and Fair Value of Available-for-Sale Securities	The amortized cost and fair value of debt securities available-for-sale at December 31, 2021 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. December 31, 2021 (dollars in thousands) Amortized Fair Value Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions Due in one year or less $ 43,513 $ 44,027 Due after one year through five years 63,849 66,363 Due after five years through ten years 106,881 107,427 Due after ten years 20,849 22,947 Debt Securities Available-for-Sale With Maturities 235,092 240,764 Collateralized mortgage obligations of U.S. government corporations and agencies 270,696 270,294 Residential mortgage-backed securities of U.S. government corporations and agencies 57,029 56,793 Commercial mortgage-backed securities of U.S. government corporations and agencies 336,918 341,300 Corporate Obligations 500 500 Total Debt Securities Available-for-Sale $ 900,235 $ 909,651
Schedule of Unrealized Gains and Losses on Marketable Equity Securities	The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented: Years ended December 31, (dollars in thousands) 2021 2020 2019 Marketable Equity Securities Net market gains (losses) recognized $ 189 $ (500) $ 334 Less: Net gains recognized for equity securities sold 29 142 — Unrealized Gains (Losses) on Equity Securities Still Held $ 160 $ (642) $ 334

Loans and Loans Held for Sale (

Loans and Loans Held for Sale (Tables)	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Composition of Loans	The following table summarizes the composition of originated and acquired loans as of the dates presented: (dollars in thousands) December 31, 2021 December 31, 2020 Commercial Commercial real estate $ 3,236,653 $ 3,244,974 Commercial and industrial 1,728,969 1,954,453 Commercial construction 440,962 474,280 Total Commercial Loans 5,406,584 5,673,707 Consumer Consumer real estate 1,485,478 1,471,238 Installment and other consumer 107,928 80,915 Total Consumer Loans 1,593,406 1,552,153 Total Portfolio Loans 6,999,990 7,225,860 Loans held for sale 1,522 18,528 Total Loans (1) $ 7,001,512 $ 7,244,388
Restructured Loans for Periods Presented and Type of Concession	The following table summarizes our restructured loans as of the dates presented: December 31, 2021 December 31, 2020 (dollars in thousands) Performing Nonperforming Total Performing Nonperforming Total Commercial real estate $ — $ 1,697 $ 1,697 $ 14 $ 16,654 $ 16,668 Commercial and industrial 748 14,889 15,637 7,090 9,885 16,975 Commercial construction 2,190 2,087 4,277 3,267 — 3,267 Business banking 858 1,696 2,554 1,503 430 1,933 Consumer real estate 6,122 1,405 7,527 5,581 2,319 7,900 Other consumer 3 — 3 5 — 5 Total $ 9,921 $ 21,774 $ 31,695 $ 17,460 $ 29,289 $ 46,748 The following tables present the restructured loans by loan segment and by type of concession for the years ended: December 31, 2021 Number Type of Modification Total Post-Modification Outstanding Recorded Investment (2) Total Pre-Modification Outstanding Recorded Investment (2) (dollars in thousands) Bankruptcy (1) Other Extend Modify Modify Commercial real estate 1 $ — $ — $ — $ — $ 1,300 $ 1,300 $ 1,824 Commercial industrial 3 — — 2,039 — 9,182 11,221 21,297 Commercial construction 1 — — 2,087 — — 2,087 5,279 Business banking 9 8 — 558 — 1,155 1,721 1,792 Consumer real estate 26 1,099 — — — 147 1,246 1,280 Other consumer — — — — — — — — Total 40 $ 1,107 $ — $ 4,684 $ — $ 11,784 $ 17,575 $ 31,472 (1) Bankruptcy is consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (2) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. December 31, 2020 Number Type of Modification Total Post-Modification Outstanding Recorded Investment (2) Total Pre-Modification Outstanding Recorded Investment (2) (dollars in thousands) Bankruptcy (1) Other Extend Modify Modify Commercial real estate 1 $ — $ — $ — $ — $ 4,791 $ 4,791 $ 5,292 Commercial industrial 3 — — 13,339 — 281 13,620 15,217 Commercial construction 3 — — 2,330 — — 2,330 2,592 Business banking 3 — — 165 — 95 260 501 Consumer real estate 29 956 — 690 — — 1,646 1,688 Other consumer 1 4 — — — — 4 5 Total 40 $ 960 $ — $ 16,524 $ — $ 5,167 $ 22,651 $ 25,295 (1) Bankruptcy is consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (2) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
Schedule of Nonperforming Assets	The following table is a summary of nonperforming assets as of the dates presented: December 31, (dollars in thousands) 2021 2020 Nonperforming Assets Nonaccrual loans $ 44,517 $ 117,485 Nonaccrual TDRs 21,774 29,289 Total nonaccrual loans 66,291 146,774 OREO 13,313 2,155 Total Nonperforming Assets $ 79,604 $ 148,929 The following tables present loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: December 31, 2021 December 31, 2021 For the twelve months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 101,070 $ 31,488 $ 28,046 $ 158 Commercial and industrial 16,985 15,239 5,707 74 Commercial construction 384 2,471 2,020 (28) Business banking 17,122 9,641 1,696 427 Consumer real estate 11,117 7,294 — 496 Other consumer 96 158 — 1 Total $ 146,774 $ 66,291 $ 37,469 $ 1,128 (1) Represents only cash payments received and applied to interest on nonaccrual loans. December 31, 2020 December 31, 2020 For the twelve months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Past Due 90+ Days Still Accruing Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 25,356 $ 101,070 $ 60,401 $ — $ 22 Commercial and industrial 10,911 16,985 6,436 — 101 Commercial construction 737 384 285 — — Business banking 9,863 17,122 3,890 371 275 Consumer real estate 6,063 11,117 398 132 423 Other consumer 1,127 96 — — 4 Total $ 54,057 $ 146,774 $ 71,410 $ 503 $ 826 (1) Represents only cash payments received and applied to interest on nonaccrual loans.
Summary of Aggregate Amount of Loans to Officers and Directors	The following table presents a summary of the aggregate amount of loans to certain officers, directors of S&T or any affiliates of such persons as of December 31: 2021 2020 Balance at beginning of year $ 6,329 $ 8,225 New loans 1,826 3,343 Repayments or no longer considered a related party (1,998) (5,239) Balance at end of year $ 6,157 $ 6,329

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2021
Receivables [Abstract]
Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings	The following tables present loan balances by year of origination and internally assigned risk rating for our portfolio segments as of the dates presented: December 31, 2021 Risk Rating (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 385,347 $ 316,003 $ 412,191 $ 314,303 $ 213,019 $ 698,992 $ 35,448 — $ 2,375,303 Special Mention — — 37,786 6,401 40,445 75,938 — — 160,570 Substandard — 1,356 18,743 14,039 12,555 106,461 1,500 — 154,654 Doubtful — — — — — — — — — Total Commercial Real Estate 385,347 317,359 468,720 334,743 266,019 881,391 36,948 — 2,690,528 Commercial and Industrial Pass 437,483 126,371 115,359 83,030 37,176 132,182 536,554 — 1,468,155 Special Mention 46 — 3,060 2,546 72 832 8,887 — 15,443 Substandard — — 14,221 1,336 4,174 3,456 4,961 — 28,148 Doubtful — — 1,777 — — — — — 1,777 Total Commercial and Industrial 437,529 126,371 134,417 86,912 41,422 136,470 550,402 — 1,513,523 Commercial Construction Pass 142,321 108,405 111,512 16,838 989 3,539 30,036 — 413,640 Special Mention — — — — — 4,458 — — 4,458 Substandard — 2,157 2,020 — — 2,480 — — 6,657 Doubtful — — — — — — — — — Total Commercial Construction 142,321 110,562 113,532 16,838 989 10,477 30,036 — 424,755 Business Banking Pass 257,264 107,791 141,411 110,586 79,187 293,215 107,093 443 1,096,990 Special Mention 104 151 1,986 1,365 1,057 5,929 160 111 10,863 Substandard 41 106 1,579 3,277 1,645 19,591 977 625 27,841 Doubtful — — — — — — — — — Total Business Banking 257,409 108,048 144,976 115,228 81,889 318,735 108,230 1,179 1,135,693 Consumer Real Estate Pass 137,465 100,995 91,981 48,531 39,029 231,861 442,530 23,391 1,115,783 Special Mention — — — — — 937 — — 937 Substandard — — 184 1,625 1,355 5,664 876 1,161 10,865 Doubtful — — — — — — — — — Total Consumer Real Estate 137,465 100,995 92,165 50,156 40,384 238,462 443,406 24,552 1,127,585 Other consumer Pass 19,976 9,396 7,120 2,878 613 2,037 57,702 1,130 100,852 Special Mention — — — — — — — — — Substandard 83 52 141 215 408 4,407 201 1,547 7,054 Doubtful — — — — — — — — — Total Other Consumer 20,059 9,448 7,261 3,093 1,021 6,444 57,903 2,677 107,906 Total Loan Balance $ 1,380,130 $ 772,783 $ 961,071 $ 606,970 $ 431,724 $ 1,591,979 $ 1,226,925 $ 28,408 $ 6,999,990 December 31, 2020 Risk Rating (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 334,086 $ 422,800 $ 394,963 $ 277,724 $ 307,321 $ 615,217 $ 46,330 — $ 2,398,441 Special Mention — 35,499 10,200 22,502 55,174 75,022 — — 198,397 Substandard — 17,259 12,781 19,914 50,700 83,792 1,500 — 185,946 Doubtful — 645 — — 1,989 6,529 — — 9,163 Total Commercial Real Estate 334,086 476,203 417,944 320,140 415,184 780,560 47,830 — 2,791,947 Commercial and Industrial Pass 454,131 199,453 140,049 68,607 27,645 206,782 383,082 — 1,479,749 Special Mention 3,697 8,211 2,628 697 768 1,046 23,527 — 40,574 Substandard — 7,793 2,613 8,544 75 13,781 2,022 — 34,828 Doubtful — — — 4,401 — — — — 4,401 Total Commercial and Industrial 457,828 215,457 145,290 82,249 28,488 221,609 408,631 — 1,559,552 Commercial Construction Pass 131,235 224,794 59,649 2,420 6,346 4,555 12,778 — 441,777 Special Mention 1,578 2,533 3,886 — — 8,593 — — 16,590 Substandard — 3,580 — 501 — 3,629 — — 7,710 Doubtful — — — — — — — — — Total Commercial Construction 132,813 230,907 63,535 2,921 6,346 16,777 12,778 — 466,077 Business Banking Pass 296,254 154,335 123,207 86,552 77,238 266,042 103,571 291 1,107,490 Special Mention — 1,060 1,147 1,602 1,084 6,866 637 123 12,519 Substandard 103 1,078 3,896 3,209 3,880 25,871 1,341 680 40,058 Doubtful — — — — — — — — — Total Business Banking 296,357 156,473 128,250 91,363 82,202 298,779 105,549 1,094 1,160,067 Consumer Real Estate Pass 120,736 122,171 67,700 63,653 73,805 243,939 438,888 22,667 1,153,559 Special Mention — — 1,489 — — 150 132 — 1,771 Substandard — 373 742 1,480 2,449 6,958 — — 12,002 Doubtful — — — — — — — — — Total Consumer Real Estate 120,736 122,544 69,931 65,133 76,254 251,047 439,020 22,667 1,167,332 Other consumer Pass 18,849 13,162 6,784 3,395 2,082 687 26,647 2,767 74,373 Special Mention — — — — — — — — — Substandard 15 — — — — 3,367 744 2,386 6,512 Doubtful — — — — — — — — — Total Other Consumer 18,864 13,162 6,784 3,395 2,082 4,054 27,391 5,153 80,885 Total Loan Balance $ 1,360,684 $ 1,214,746 $ 831,734 $ 565,201 $ 610,556 $ 1,572,826 $ 1,041,199 $ 28,914 $ 7,225,860 The following tables present loan balances by year of origination and performing and nonperforming status for our portfolio segments as of the dates presented: December 31, 2021 (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial Real Estate Performing $ 385,347 $ 317,359 $ 461,613 $ 332,482 $ 259,723 $ 865,567 $ 36,948 $ — $ 2,659,039 Nonperforming — 7,107 2,261 6,296 15,824 — — 31,488 Total Commercial Real Estate 385,347 317,359 468,720 334,743 266,019 881,391 36,948 — 2,690,528 Commercial and Industrial Performing 437,529 126,371 123,944 86,852 38,540 136,427 548,622 — 1,498,285 Nonperforming — — 10,473 60 2,882 43 1,780 — 15,239 Total Commercial and Industrial 437,529 126,371 134,417 86,912 41,422 136,470 550,402 — 1,513,523 Commercial Construction Performing 142,321 110,562 111,445 16,838 989 10,093 30,036 — 422,284 Nonperforming — — 2,087 — — 384 — — 2,471 Total Commercial Construction 142,321 110,562 113,532 16,838 989 10,477 30,036 — 424,755 Business Banking Performing 257,368 107,984 144,689 113,820 81,195 311,673 108,202 1,122 1,126,052 Nonperforming 41 64 287 1,408 694 7,062 28 57 9,641 Total Business Banking 257,409 108,048 144,976 115,228 81,889 318,735 108,230 1,179 1,135,693 Consumer Real Estate Performing 137,465 100,253 91,689 49,853 39,657 234,297 443,238 23,839 1,120,291 Nonperforming — 742 476 303 727 4,165 168 713 7,294 Total Consumer Real Estate 137,465 100,995 92,165 50,156 40,384 238,462 443,406 24,552 1,127,585 Other Consumer Performing 20,059 9,290 7,261 3,093 1,021 6,444 57,903 2,677 107,748 Nonperforming — 158 — — — — — — 158 Total Other Consumer 20,059 9,448 7,261 3,093 1,021 6,444 57,903 2,677 107,906 Performing 1,380,089 771,819 940,641 602,938 421,125 1,564,501 1,224,949 27,638 6,933,699 Nonperforming 41 964 20,430 4,032 10,599 27,478 1,976 770 66,291 Total Loan Balance $ 1,380,130 $ 772,783 $ 961,071 $ 606,970 $ 431,724 $ 1,591,979 $ 1,226,925 $ 28,408 $ 6,999,990 December 31, 2020 (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Performing $ 334,086 $ 459,799 $ 417,944 $ 313,465 $ 394,972 $ 722,782 $ 47,830 $ — $ 2,690,879 Nonperforming — 16,404 — 6,675 20,212 57,778 — — 101,070 Total Commercial Real Estate 334,086 476,203 417,944 320,140 415,184 780,560 47,830 — 2,791,947 Commercial and Industrial Performing 457,828 214,144 143,706 69,411 28,426 220,701 408,350 — 1,542,566 Nonperforming — 1,313 1,584 12,838 62 908 281 — 16,985 Total Commercial and Industrial 457,828 215,457 145,290 82,249 28,488 221,609 408,631 — 1,559,552 Commercial Construction Performing 132,813 230,907 63,535 2,921 6,346 16,393 12,778 — 465,692 Nonperforming — — — — — 384 — — 384 Total Commercial Construction 132,813 230,907 63,535 2,921 6,346 16,777 12,778 — 466,077 Business Banking Performing 296,327 156,164 126,432 90,414 80,106 286,970 105,494 1,037 1,142,944 Nonperforming 30 309 1,818 949 2,096 11,809 55 57 17,123 Total Business Banking 296,357 156,473 128,250 91,363 82,202 298,779 105,549 1,094 1,160,067 Consumer Real Estate Performing 120,736 122,315 69,225 63,647 74,690 245,331 438,702 21,572 1,156,216 Nonperforming — 229 706 1,486 1,564 5,716 318 1,096 11,116 Total Consumer Real Estate 120,736 122,544 69,931 65,133 76,254 251,047 439,020 22,667 1,167,332 Other Consumer Performing 18,864 13,162 6,784 3,395 2,082 3,958 27,391 5,153 80,789 Nonperforming — — — — — 96 — — 96 Total Other Consumer 18,864 13,162 6,784 3,395 2,082 4,054 27,391 5,153 80,885 Performing 1,360,654 1,196,491 827,625 543,253 586,622 1,496,135 1,040,544 27,762 7,079,086 Nonperforming 30 18,254 4,108 21,948 23,934 76,691 654 1,153 146,774 Total Loan Balance $ 1,360,684 $ 1,214,746 $ 831,734 $ 565,201 $ 610,556 $ 1,572,826 $ 1,041,199 $ 28,914 $ 7,225,860 The following tables present collateral-dependent loans by class of loan: December 31, 2021 Type of Collateral (dollars in thousands) Real Estate Blanket Lien Investment/Cash Other Commercial real estate $ 28,046 $ — $ — $ — Commercial and industrial 259 4,905 — 10,473 Commercial construction 4,210 — — — Business banking 910 1,636 — — Consumer real estate 1,031 — — — Total $ 34,456 $ 6,541 $ — $ 10,473 December 31, 2020 Type of Collateral (dollars in thousands) Real Estate Blanket Lien Investment/Cash Other Commercial real estate $ 100,450 $ — $ — $ — Commercial and industrial 1,040 15,080 — — Commercial construction 3,552 — — — Business banking 3,085 1,619 — 689 Consumer real estate 398 — — — Total $ 108,525 $ 16,699 $ — $ 689
Age Analysis of Past Due Loans Segregated by Class of Loans	The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented: December 31, 2021 (1) (dollars in thousands) Current 30-59 Days 60-89 Days Non- Total Total Loans Commercial real estate $ 2,659,040 $ — $ — $ 31,488 $ 31,488 $ 2,690,528 Commercial and industrial 1,497,755 529 — 15,239 15,768 1,513,523 Commercial construction 421,834 450 — 2,471 2,921 424,755 Business banking 1,124,748 813 491 9,641 10,945 1,135,693 Consumer real estate 1,117,073 1,087 2,130 7,294 10,512 1,127,585 Other consumer 107,492 206 50 158 414 107,906 Total $ 6,927,943 $ 3,085 $ 2,672 $ 66,291 $ 72,048 $ 6,999,990 (1) We had 8 loans that were modified totaling $28.8 million under the CARES Act at December 31, 2021 compared to 52 loans that were modified totaling $195.6 million at December 31, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans. December 31, 2020 (2) (dollars in thousands) Current 30-59 Days 60-89 Days 90 Days + Past Due (1) Non- Total Total Loans Commercial real estate $ 2,690,877 $ — $ — $ — $ 101,070 $ 101,070 $ 2,791,947 Commercial and industrial 1,542,567 — — — 16,985 16,985 1,559,552 Commercial construction 462,094 19 3,580 — 384 3,983 466,077 Business banking 1,140,581 1,614 379 371 17,122 19,486 1,160,067 Consumer real estate 1,153,028 1,087 1,968 132 11,117 14,304 1,167,332 Other consumer 80,583 168 37 — 96 302 80,885 Total $ 7,069,730 $ 2,888 $ 5,965 $ 503 $ 146,774 $ 156,130 $ 7,225,860 (1) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at December 31, 2020. (2) We had 52 loans that were modified totaling $195.6 million at December 31, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.
Schedule of Nonperforming Assets	The following table is a summary of nonperforming assets as of the dates presented: December 31, (dollars in thousands) 2021 2020 Nonperforming Assets Nonaccrual loans $ 44,517 $ 117,485 Nonaccrual TDRs 21,774 29,289 Total nonaccrual loans 66,291 146,774 OREO 13,313 2,155 Total Nonperforming Assets $ 79,604 $ 148,929 The following tables present loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: December 31, 2021 December 31, 2021 For the twelve months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 101,070 $ 31,488 $ 28,046 $ 158 Commercial and industrial 16,985 15,239 5,707 74 Commercial construction 384 2,471 2,020 (28) Business banking 17,122 9,641 1,696 427 Consumer real estate 11,117 7,294 — 496 Other consumer 96 158 — 1 Total $ 146,774 $ 66,291 $ 37,469 $ 1,128 (1) Represents only cash payments received and applied to interest on nonaccrual loans. December 31, 2020 December 31, 2020 For the twelve months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Past Due 90+ Days Still Accruing Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 25,356 $ 101,070 $ 60,401 $ — $ 22 Commercial and industrial 10,911 16,985 6,436 — 101 Commercial construction 737 384 285 — — Business banking 9,863 17,122 3,890 371 275 Consumer real estate 6,063 11,117 398 132 423 Other consumer 1,127 96 — — 4 Total $ 54,057 $ 146,774 $ 71,410 $ 503 $ 826 (1) Represents only cash payments received and applied to interest on nonaccrual loans.
Schedule of Allowance for Credit Loss	The following tables present activity in the ACL for years ended: Twelve Months Ended December 31, 2021 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 65,656 $ 16,100 $ 7,239 $ 15,917 $ 10,014 $ 2,686 $ 117,612 Provision for credit losses on loans (2) (2,569) 23,746 (1,842) (3,159) (1,020) 338 15,494 Charge-offs (13,444) (20,923) (56) (1,580) (569) (952) (37,524) Recoveries 1,057 804 14 160 308 651 2,994 Net (Charge-offs)/Recoveries (12,387) (20,119) (42) (1,420) (261) (301) (34,530) Balance at End of Period $ 50,700 $ 19,727 $ 5,355 $ 11,338 $ 8,733 $ 2,723 $ 98,576 Twelve Months Ended December 31, 2020 (dollars in thousands) Commercial Commercial and Industrial (1) Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 30,577 $ 15,681 $ 7,900 $ — $ 6,337 $ 1,729 $ 62,224 Impact of CECL adoption 4,810 7,853 (3,376) 12,898 4,525 636 27,346 Provision for credit losses on loans (2) 56,489 65,288 2,986 5,303 (368) 1,723 131,421 Charge-offs (26,460) (74,282) (454) (2,612) (667) (1,890) (106,365) Recoveries 240 1,560 183 328 187 488 2,986 Net (Charge-offs)/Recoveries (26,220) (72,722) (271) (2,284) (480) (1,402) (103,379) Balance at End of Period $ 65,656 $ 16,100 $ 7,239 $ 15,917 $ 10,014 $ 2,686 $ 117,612 (1) During the three months ended June 30, 2020, we experienced a pre-tax loss of $58.7 million related to a customer fraud resulting from a check kiting scheme. (2) Excludes the provision for credit losses for unfunded commitments.

Right-Of-Use Assets and Lease_2

Right-Of-Use Assets and Lease Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Finance and Operating Lease Details	The following table presents our lease expense for finance and operating leases for the years ended December 31: (dollars in thousands) 2021 2020 2019 Operating lease expense (1) $ 5,135 $ 5,711 $ 4,221 Amortization of ROU assets - finance leases (1) 224 224 101 Interest on lease liabilities - finance leases (2) 74 84 74 Total Lease Expense $ 5,433 $ 6,019 $ 4,396 (1) Included in occupancy expense in our Consolidated Statements of Net Income. (2) Included in borrowings interest expense in our Consolidated Statements of Net Income. The following table presents our ROU assets, weighted average term and the discount rates for finance and operating leases as of December 31: (dollars in thousands) 2021 2020 Operating Leases ROU assets $ 44,067 $ 46,245 Operating cash flows $ 6,570 $ 6,489 Finance Leases ROU assets $ 1,055 $ 1,278 Operating cash flows $ 74 $ 84 Financing cash flows $ 194 $ 180 Weighted Average Lease Term - Years Operating leases 18.9 18.7 Finance leases 12.4 12.1 Weighted Average Discount Rate Operating leases 5.82 % 5.90 % Finance leases 5.91 % 5.81 %
Finance and Operating Lease Details	The following table presents our lease expense for finance and operating leases for the years ended December 31: (dollars in thousands) 2021 2020 2019 Operating lease expense (1) $ 5,135 $ 5,711 $ 4,221 Amortization of ROU assets - finance leases (1) 224 224 101 Interest on lease liabilities - finance leases (2) 74 84 74 Total Lease Expense $ 5,433 $ 6,019 $ 4,396 (1) Included in occupancy expense in our Consolidated Statements of Net Income. (2) Included in borrowings interest expense in our Consolidated Statements of Net Income. The following table presents our ROU assets, weighted average term and the discount rates for finance and operating leases as of December 31: (dollars in thousands) 2021 2020 Operating Leases ROU assets $ 44,067 $ 46,245 Operating cash flows $ 6,570 $ 6,489 Finance Leases ROU assets $ 1,055 $ 1,278 Operating cash flows $ 74 $ 84 Financing cash flows $ 194 $ 180 Weighted Average Lease Term - Years Operating leases 18.9 18.7 Finance leases 12.4 12.1 Weighted Average Discount Rate Operating leases 5.82 % 5.90 % Finance leases 5.91 % 5.81 %
Maturity Analysis of Lease Liabilities for Operating Leases	The following table presents the maturity analysis of lease liabilities for finance and operating leases as of December 31, 2021: (dollars in thousands) Maturity Analysis Finance Operating Total 2022 $ 225 $ 4,707 $ 4,932 2023 129 4,519 4,648 2024 130 4,512 4,642 2025 132 4,544 4,676 2026 133 4,574 4,707 Thereafter 1,012 64,040 65,052 Total 1,761 86,896 88,657 Less: Present value discount (561) (36,830) (37,391) Lease Liabilities $ 1,200 $ 50,066 $ 51,266
Maturity Analysis of Lease Liabilities for Finance Leases	The following table presents the maturity analysis of lease liabilities for finance and operating leases as of December 31, 2021: (dollars in thousands) Maturity Analysis Finance Operating Total 2022 $ 225 $ 4,707 $ 4,932 2023 129 4,519 4,648 2024 130 4,512 4,642 2025 132 4,544 4,676 2026 133 4,574 4,707 Thereafter 1,012 64,040 65,052 Total 1,761 86,896 88,657 Less: Present value discount (561) (36,830) (37,391) Lease Liabilities $ 1,200 $ 50,066 $ 51,266

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	The following table is a summary of premises and equipment as of the dates presented: December 31, (dollars in thousands) 2021 2020 Land $ 8,651 $ 8,651 Premises 62,313 61,299 Furniture and equipment 46,799 45,072 Leasehold improvements 12,205 12,061 129,968 127,083 Accumulated depreciation (77,336) (71,469) Total $ 52,632 $ 55,614

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents goodwill as of the dates presented: December 31, (dollars in thousands) 2021 2020 Balance at beginning of year $ 373,424 $ 371,621 Additions — 1,803 Balance at End of Year $ 373,424 $ 373,424
Summary of Intangible Assets	The following table presents a summary of intangible assets as of the dates presented: December 31, (dollars in thousands) 2021 2020 Gross carrying amount at beginning of year $ 31,340 $ 31,052 Additions — 288 Accumulated amortization (24,445) (22,665) Balance at End of Year $ 6,895 $ 8,675
Summary of Expected Amortization Expense for Finite-Lived Intangibles Assets	The following is a summary of the expected amortization expense for finite-lived intangible assets, assuming no new additions, for each of the five years following December 31, 2021 and thereafter: (dollars in thousands) Amount 2022 $ 1,518 2023 1,319 2024 1,151 2025 820 2026 671 Thereafter 1,416 Total $ 6,895

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Value of Derivative Assets and Derivative Liabilities	The following table indicates the amounts representing the value of derivative assets and derivative liabilities at December 31: Derivatives (included in Derivatives (included (dollars in thousands) 2021 2020 2021 2020 Derivatives not Designated as Hedging Instruments Interest Rate Swap Contracts—Commercial Loans Fair value $ 33,528 $ 78,319 $ 33,631 $ 79,033 Notional amount 1,017,178 983,638 1,017,178 983,638 Collateral posted — — 37,360 77,930 Interest Rate Lock Commitments—Mortgage Loans Fair value 401 2,900 — — Notional amount 12,148 51,053 — — Forward Sale Contracts—Mortgage Loans Fair value 4 — — 385 Notional amount 8,436 — — 47,062
Schedule of Gross Amounts of Derivative Assets	The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets at December 31: Derivatives (included Derivatives (included (dollars in thousands) 2021 2020 2021 2020 Derivatives not Designated as Hedging Instruments Gross amounts recognized $ 37,289 $ 82,655 $ 37,392 $ 82,626 Gross amounts offset (3,761) (4,336) (3,761) (3,593) Net amounts presented in the Consolidated Balance Sheets 33,528 78,319 33,631 79,033 Gross amounts not offset (1) — — (37,360) (77,930) Net Amount $ 33,528 $ 78,319 $ (3,729) $ 1,103 (1) Amounts represent collateral posted for the periods presented.
Schedule of Gross Amounts of Derivative Liabilities	The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets at December 31: Derivatives (included Derivatives (included (dollars in thousands) 2021 2020 2021 2020 Derivatives not Designated as Hedging Instruments Gross amounts recognized $ 37,289 $ 82,655 $ 37,392 $ 82,626 Gross amounts offset (3,761) (4,336) (3,761) (3,593) Net amounts presented in the Consolidated Balance Sheets 33,528 78,319 33,631 79,033 Gross amounts not offset (1) — — (37,360) (77,930) Net Amount $ 33,528 $ 78,319 $ (3,729) $ 1,103 (1) Amounts represent collateral posted for the periods presented.
Amount of Gain or Loss Recognized in Income on Derivatives	The following table indicates the gain or loss recognized in income on derivatives for the years ended December 31: (dollars in thousands) 2021 2020 2019 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ 610 $ (746) $ (132) Interest rate lock commitments—mortgage loans (2,499) 1,715 70 Forward sale contracts—mortgage loans 389 478 (54) Total Derivative (Loss)/Gain $ (1,500) $ 1,447 $ (116)

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2021
Transfers and Servicing of Financial Assets [Abstract]
Schedule of Mortgage Servicing Rights at Net Carrying Value	The following table indicates MSRs and the net carrying values: (dollars in thousands) Servicing Valuation Net Carrying Balance at December 31, 2019 $ 4,939 $ (277) $ 4,662 Additions 2,887 — 2,887 Amortization (1,206) — (1,206) Temporary impairment — (1,354) (1,354) Balance at December 31, 2020 $ 6,620 $ (1,631) $ 4,989 Additions 2,974 — 2,974 Amortization (1,707) — (1,707) Temporary recapture — 1,421 1,421 Balance at December 31, 2021 $ 7,887 $ (210) $ 7,677

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2021
Deposits, by Component, Alternative [Abstract]
Deposit Liabilities, Type	The following table presents the composition of deposits at December 31 and interest expense for the years ended December 31: 2021 2020 2019 (dollars in thousands) Balance Interest Balance Interest Balance Interest Noninterest-bearing demand $ 2,748,586 $ — $ 2,261,994 $ — $ 1,698,082 $ — Interest-bearing demand 979,133 809 864,510 2,681 962,331 3,915 Money market 2,070,579 3,651 1,937,063 11,645 1,949,811 30,236 Savings 1,110,155 366 969,508 972 830,919 1,928 Certificates of deposit 1,088,071 5,930 1,387,463 20,688 1,595,433 26,947 Total $ 7,996,524 $ 10,757 $ 7,420,538 $ 35,986 $ 7,036,576 $ 63,026
Time Deposit Maturities	The following table indicates the scheduled maturities of certificates of deposit at December 31, 2021: (dollars in thousands) Amount 2022 $ 961,578 2023 40,622 2024 21,712 2025 44,345 2026 16,475 Thereafter 3,339 Total $ 1,088,071

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Schedule of Composition of Short-Term Borrowings, Interest Expense and Weighted Average Interest Rate	The following table presents the composition of short-term borrowings, the weighted average interest rate as of December 31 and interest expense for the years ended December 31: 2021 2020 2019 (dollars in thousands) Balance Weighted Interest Balance Weighted Interest Balance Weighted Interest REPOs $ 84,491 0.10 % $ 79 $ 65,163 0.25 % $ 169 $ 19,888 0.74 % $ 110 FHLB advances — — % 12 75,000 0.19 % 1,434 281,319 1.84 % 6,416 Total Short-term Borrowings $ 84,491 0.10 % $ 91 $ 140,163 0.22 % $ 1,603 $ 301,207 1.76 % $ 6,526

Long-Term Borrowings and Subo_2

Long-Term Borrowings and Subordinated Debt (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-Term Borrowings, Interest Expense and Weighted Average Interest Rate	The following table represents the balance of long-term borrowings, the weighted average interest rate as of December 31 and interest expense for the years ended December 31: (dollars in thousand) 2021 2020 2019 Long-term borrowings $ 22,430 $ 23,681 $ 50,868 Weighted average interest rate 1.94 % 2.03 % 2.60 % Interest expense $ 458 $ 1,201 $ 1,831
Schedule of Annual Maturities and Average Interest Rate of Long-Term Debt	Scheduled annual maturities and average interest rates for all of our long-term debt for each of the five years subsequent to December 31, 2020 and thereafter are as follows: (dollars in thousands) Balance Average Rate 2022 $ 7,689 2.29 % 2023 464 5.74 % 2024 13,381 1.34 % 2025 81 5.98 % 2026 87 6.00 % Thereafter 728 6.01 % Total $ 22,430 1.94 %
Schedule of Junior Subordinated Debt Securities and Interest Expense	The following table represents the composition of junior subordinated debt securities at December 31 and the interest expense for the years ended December 31: 2021 2020 2019 (dollars in thousands) Balance Interest Balance Interest Balance Interest Junior subordinated debt $ 25,000 $ 756 $ 34,750 $ 1,007 $ 34,753 $ 1,059 Junior subordinated debt—trust preferred securities 29,393 1,087 29,333 1,279 29,524 1,251 Total $ 54,393 $ 1,843 $ 64,083 $ 2,286 $ 64,277 $ 2,310
Schedule of Junior Subordinated Debt Securities	The following table summarizes the key terms of our junior subordinated debt securities: (dollars in thousands) 2001 Trust 2005 Trust 2006 Junior 2008 Trust Junior Subordinated Debt $— $— $25,000 $— Trust Preferred Securities 5,155 4,124 — 20,619 Stated Maturity Date 7/25/2031 5/23/2035 12/15/2036 3/15/2038 Optional redemption date at par Any time after 7/25/2011 Any time after 5/23/2010 Any time after 9/15/2011 Any time after 3/15/2013 Regulatory Capital Tier 1 Tier 1 Tier 2 Tier 1 Interest Rate 6 Month LIBOR plus 375 bps 3 Month LIBOR plus 177 bps 3 month LIBOR plus 160 bps 3 month LIBOR plus 350 bps Interest Rate at December 31, 2021 3.90% 1.93% 1.80% 3.70%

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments and Letters of Credit	The following table sets forth our commitments and letters of credit as of the dates presented: December 31, (dollars in thousands) 2021 2020 Commitments to extend credit $ 2,583,957 $ 2,185,752 Standby letters of credit 87,335 89,095 Total $ 2,671,292 $ 2,274,847
Unfunded Loan Commitments, Allowance For Credit Loss	The activity in the unfunded loan commitments reserve is summarized as of the dates presented: (dollars in thousands) December 31, 2021 December 31, 2020 Balance at beginning of period $ 4,467 $ 3,112 Impact of adopting ASU 2016-13 at January 1, 2020 — 1,349 Balance after adoption of ASU 2016-13 4,467 4,461 Provision for credit losses 722 6 Total $ 5,189 $ 4,467
Significant Fixed and Determinable Contractual Obligation	The following table presents as of December 31, 2021 significant fixed and determinable contractual obligations to third parties by payment date: Payments Due In (dollars in thousands) 2022 2023-2024 2025-2026 Later Years Total Deposits without a stated maturity (1) $ 6,908,453 $ — $ — $ — $ 6,908,453 Certificates of deposit (1) 961,578 62,334 60,820 3,339 1,088,071 Securities sold under repurchase agreements (1) 84,491 — — — 84,491 Short-term borrowings (1) — — — — — Long-term borrowings (1) 7,689 13,845 168 728 22,430 Junior subordinated debt securities (1) — — — 54,393 54,393 Operating and capital leases 4,932 9,290 9,383 65,052 88,657 Purchase obligations 19,823 42,432 46,492 — 108,747 Total $ 7,986,966 $ 127,901 $ 116,863 $ 123,512 $ 8,355,242 (1) Excludes interest

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The information presented in the following table presents the point of revenue recognition for revenue from contracts with customers. Other revenue streams are excluded such as: interest income, net securities gains and losses, insurance, mortgage banking and other revenues that are accounted for under other GAAP. Years ended December 31, (dollars in thousands) 2021 2020 2019 Revenue Streams (1) Point of Revenue Recognition Service charges on deposit accounts Over a period of time $ 1,880 $ 1,797 $ 1,859 At a point in time 13,160 11,800 11,457 $ 15,040 $ 13,597 $ 13,316 Debit and credit card Over a period time $ 919 $ 738 $ 723 At a point in time 17,033 14,355 12,682 $ 17,952 $ 15,093 $ 13,405 Wealth management Over a period of time $ 9,187 $ 7,919 $ 6,939 At a point in time 3,702 2,038 1,684 $ 12,889 $ 9,957 $ 8,623 Other fee revenue At a point in time $ 1,900 $ 1,810 $ 3,836 (1) Refer to Note 1 Summary of Significant Accounting Policies for the types of revenue streams that are included within each category.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of Income Tax Expense (Benefit)	The following table presents the composition of income tax expense (benefit) for the years ended December 31: (dollars in thousands) 2021 2020 2019 Federal Current $ 22,581 $ 4,256 $ 18,918 Deferred 2,273 (4,273) (406) Total Federal 24,854 (17) 18,512 State Current 361 145 589 Deferred 110 (129) 25 Total State 471 16 614 Total Federal and State $ 25,325 $ (1) $ 19,126
Schedule of Statutory to Effective Tax Rate Reconciliation	The following table presents a reconciliation of the statutory tax rate to the effective tax rate for the years ended December 31: 2021 2020 2019 Statutory tax rate 21.0 % 21.0 % 21.0 % Low income housing tax credits (1.5) % (11.1) % (3.3) % Tax-exempt interest (1.3) % (11.9) % (2.1) % Bank owned life insurance (0.3) % (1.8) % (0.4) % Merger related expenses — % — % 0.3 % Other 0.8 % 3.8 % 0.8 % Effective Tax Rate 18.7 % — % 16.3 %
Schedule of Significant Components of Temporary Differences	The following table presents significant components of our temporary differences as of the dates presented: December 31, (dollars in thousands) 2021 2020 Deferred Tax Assets: Allowance for credit losses $ 22,083 $ 26,051 Lease liabilities 10,876 11,368 State net operating loss carryforwards 5,565 5,489 Net adjustment to funded status of pension 3,922 4,692 Low income housing partnerships 3,270 3,996 Other employee benefits 3,433 2,050 Other 3,973 3,798 Gross Deferred Tax Assets 53,122 57,444 Less: Valuation allowance (5,565) (5,489) Total Deferred Tax Assets 47,557 51,955 Deferred Tax Liabilities: Right-of-use lease assets (9,603) (10,141) Net unrealized gains on securities available-for-sale (2,004) (7,125) Deferred loan income (6,697) (6,796) Prepaid pension (4,566) (5,209) Purchase accounting adjustments (1,954) (1,971) Depreciation on premises and equipment (1,107) (1,275) Other (1,466) (1,245) Total Deferred Tax liabilities (27,397) (33,762) Net Deferred Tax Asset $ 20,160 $ 18,193
Schedule of Reconciliation of Change in Federal and State Gross Unrecognized Tax Benefits	The following table reconciles the change in Federal and State gross unrecognized tax benefits, or UTB, for the years ended December 31: (dollars in thousands) 2021 2020 2019 Balance at beginning of year $ 1,277 $ 1,051 $ 768 Prior period tax positions — (18) (10) Current period tax positions 54 244 293 Balance at End of Year $ 1,331 $ 1,277 $ 1,051 Amount That Would Impact the Effective Tax Rate if Recognized $ 1,069 $ 1,027 $ 848

Tax Effects on Other Comprehe_2

Tax Effects on Other Comprehensive (Loss) Income (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Schedule of Tax Effects of Components of Other Comprehensive (Loss) Income	The following tables present the tax effects of the components of other comprehensive (loss) income for the years ended December 31: (dollars in thousands) Pre-Tax Tax Benefit (Expense) Net of Tax 2021 Net change in unrealized gains on debt securities available-for sale $ (23,972) $ 5,115 $ (18,857) Net available-for-sale securities (gains) losses reclassified into earnings — — — Adjustment to funded status of employee benefit plans 3,561 (765) 2,796 Other Comprehensive Loss $ (20,411) $ 4,350 $ (16,061) 2020 Net change in unrealized gains on debt securities available-for-sale $ 22,683 $ (4,827) $ 17,856 Net available-for-sale securities (gains) losses reclassified into earnings — — — Adjustment to funded status of employee benefit plans 3,549 (764) 2,785 Other Comprehensive Income $ 26,232 $ (5,591) $ 20,641 2019 Net change in unrealized gains on debt securities available-for-sale $ 15,793 $ (3,367) $ 12,426 Net available-for-sale securities losses (gains) reclassified into earnings 26 (6) 20 Adjustment to funded status of employee benefit plans (1,282) 273 (1,009) Other Comprehensive Income $ 14,537 $ (3,100) $ 11,437

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Benefit Obligation and Plan Assets Deriving Funded Status, in Other Liabilities	The following table summarizes the activity in the benefit obligation and Plan assets deriving the funded status: (dollars in thousands) 2021 2020 Change in Projected Benefit Obligation Projected benefit obligation at beginning of year $ 117,506 $ 113,679 Interest cost 2,950 3,456 Actuarial gain/(loss) (2,136) 10,525 Benefits paid (14,223) (10,154) Projected Benefit Obligation at End of Year $ 104,097 $ 117,506 Change in Plan Assets Fair value of plan assets at beginning of year $ 122,344 $ 116,652 Actual return on plan assets (596) 15,731 Employer contributions — 115 Benefits paid (14,223) (10,154) Fair Value of Plan Assets at End of Year $ 107,525 $ 122,344 Funded Status $ 3,428 $ 4,838
Accumulated Other Comprehensive Income (Loss)	The following table sets forth the amounts recognized in accumulated other comprehensive income at December 31: (dollars in thousands) 2021 2020 Net actuarial loss (18,029) (19,572) Total (Before Tax Effects) $ (18,029) $ (19,572)
Actuarial Weighted Average Assumptions Used in Determining Benefit Obligation	Below are the actuarial weighted average assumptions used in determining the benefit obligation: 2021 2020 Discount rate 2.80 % 2.48 % Rate of compensation increase (1) — % — % (1) Rate of compensation increase is not applicable for 2021 and 2020 due to the amendment to freeze benefit accruals under the qualified and nonqualified defined benefit pension plans effective March 31, 2016. The following table summarizes the actuarial weighted average assumptions used in determining net periodic pension cost: 2021 2020 2019 Discount rate 2.48 % 3.25 % 4.31 % Rate of compensation increase (1) — % — % — % Expected return on assets 2.42 % 3.45 % 4.80 % (1) Rate of compensation increase is not applicable for 2021, 2020, and 2019 due to the amendment to freeze benefit accruals under the qualified and nonqualified defined benefit pension plans effective March 31, 2016.
Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss)	The following table summarizes the components of net periodic pension cost and other changes in Plan assets and benefit obligations recognized in other comprehensive loss for the years ended December 31: (dollars in thousands) 2021 2020 2019 Components of Net Periodic Pension Cost Interest cost on projected benefit obligation $ 2,950 $ 3,456 $ 3,987 Expected return on plan assets (2,677) (3,925) (4,731) Amortization of prior service credit - DNB merger — — 7 Recognized net actuarial loss 1,051 1,419 1,604 Settlement charge 1,629 833 — Net Periodic Pension Expense $ 2,953 $ 1,783 $ 867 Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss) Net actuarial loss/(gain) $ 1,137 $ (1,282) $ 2,370 Recognized net actuarial loss (1,051) (1,419) (1,604) Settlement loss recognized (1,629) (833) — Recognized prior service credit — — — Total (Before Tax Effects) $ (1,543) $ (3,534) $ 766 Total Recognized in Net Benefit Cost and Other Comprehensive Income/(Loss) (Before Tax Effects) $ 1,410 $ (1,751) $ 1,633
Schedule of Expected Benefit Payments	The following table provides information regarding estimated future benefit payments to be paid in each of the next five years and in the aggregate for the five years thereafter: (dollars in thousands) Amount 2022 $ 7,088 2023 7,023 2024 6,768 2025 6,590 2026 6,361 2027 - 2031 30,536
Pension Plan Assets Measured at Fair Value on Recurring Basis	The following tables present our Plan assets measured at fair value on a recurring basis by fair value hierarchy level at December 31, 2021 and 2020. During the years ended December 31, 2021 and 2020 there were no transfers between Level 1 and Level 2 for items of a recurring basis. There were no purchases or transfers of Level 3 plan assets in 2021 or 2020. December 31, 2021 Fair Value Asset Classes (1) (dollars in thousands) Level 1 Level 2 Level 3 Total Cash and cash equivalents (2) $ 3,759 $ — $ — $ 3,759 Fixed income (3) 93,495 — — 93,495 Equities: Equity index mutual funds—international (4) 3,043 — — 3,043 Domestic individual equities (5) 7,228 — — 7,228 Total Assets at Fair Value $ 107,525 $ — $ — $ 107,525 (1) Refer to Note 1 Summary of Significant Accounting Policies, Fair Value Measurements for a description of levels within the fair value hierarchy. (2) This asset class includes FDIC insured money market instruments. (3) This asset class includes a variety of fixed income mutual funds which primarily invest in investment grade rated securities. Investment managers have discretion to invest in fixed income related securities including futures, options and other derivatives. Investments may be made in currencies other than the U.S. dollar. (4) The sole investment within this asset class is the Vanguard Total International Stock Index Fund Admiral Shares. (5) This asset class includes individual domestic equities invested in an active all-cap strategy. It may also include convertible bonds. December 31, 2020 Fair Value Asset Classes (1) (dollars in thousands) Level 1 Level 2 Level 3 Total Cash and cash equivalents (2) $ 1,563 $ — $ — $ 1,563 Fixed income (3) 108,583 — — 108,583 Equities: Equity index mutual funds—international (4) 3,332 — — 3,332 Domestic individual equities (5) 8,866 — — 8,866 Total Assets at Fair Value $ 122,344 $ — $ — $ 122,344 (1) Refer to Note 1 Summary of Significant Accounting Policies, Fair Value Measurements for a description of levels within the fair value hierarchy. (2) This asset class includes FDIC insured money market instruments. (3) This asset class includes a variety of fixed income mutual funds which primarily invest in investment grade rated securities. Investment managers have discretion to invest in fixed income related securities including futures, options and other derivatives. Investments may be made in currencies other than the U.S. dollar. (4) The sole investment within this asset class is Vanguard Total International Stock Index Fund Admiral Shares. (5) This asset class includes individual domestic equities invested in an active all-cap strategy. It may also include convertible bonds.

Incentive and Restricted Stoc_2

Incentive and Restricted Stock Plan and Dividend Reinvestment Plan (Tables)	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Nonvested Restricted Stock Shares Activity	The following table provides information about restricted stock awards granted under the plans for the periods presented: December 31, Vesting Period 2021 2020 2019 2021 Stock Plan Directors One year 14,650 — — Chief Executive Officer One year 8,309 — — Other Awards Three years 8,000 — — 2014 Stock Plan Directors One year — 23,153 13,057 Senior Management Three years 78,769 123,881 71,825 Other Awards Three years 20,942 83,669 — Total Restricted Stock Grants 130,670 230,703 84,882
Summary of Non-Vested Restricted Stock	The following table provides information about restricted stock granted under the Plans for the years ended December 31: Restricted Weighted Average Non-vested at December 31, 2019 182,035 $ 34.06 Granted 230,703 23.43 Vested 77,317 37.39 Forfeited 58,741 32.77 Non-vested at December 31, 2020 276,680 $ 24.54 Granted 130,670 33.17 Vested 71,152 27.66 Forfeited 57,810 34.93 Non-vested at December 31, 2021 278,388 $ 25.64

Parent Company Condensed Fina_2

Parent Company Condensed Financial Information (Tables)	12 Months Ended
	Dec. 31, 2021
Condensed Financial Information Disclosure [Abstract]
Balance Sheets of S&T Bancorp, Inc.	BALANCE SHEETS December 31, (dollars in thousands) 2021 2020 ASSETS Cash $ 10,769 $ 6,585 Investments in: Bank subsidiary 1,209,796 1,168,831 Non-bank subsidiaries 5,684 10,493 Other assets 9,993 8,614 Total Assets $ 1,236,242 $ 1,194,523 LIABILITIES Long-term debt $ 29,521 $ 39,317 Other liabilities 267 495 Total Liabilities 29,788 39,812 Total Shareholders’ Equity 1,206,454 1,154,711 Total Liabilities and Shareholders’ Equity $ 1,236,242 $ 1,194,523
Statements of Net Income of S&T Bancorp, Inc.	STATEMENTS OF NET INCOME Years ended December 31, (dollars in thousands) 2021 2020 2019 Dividends from subsidiaries $ 62,333 $ 59,315 $ 59,490 Investment income — — 1 Total Income 62,333 59,315 59,491 Interest expense on long-term debt 313 1,696 1,285 Other expenses 5,034 4,464 4,325 Total Expense 5,347 6,160 5,610 Income before income tax and undistributed net income of subsidiaries 56,986 53,155 53,881 Income tax benefit (1,140) (1,315) (1,189) Income before undistributed net income of subsidiaries 58,126 54,470 55,070 Equity in undistributed net income (distribution in excess of net income) of: Bank subsidiary 57,025 (27,529) 42,683 Non-bank subsidiaries (4,808) (5,901) 481 Net Income $ 110,343 $ 21,040 $ 98,234
Statements of Cash Flows of S&T Bancorp, Inc.	STATEMENTS OF CASH FLOWS Years ended December 31, (dollars in thousands) 2021 2020 2019 OPERATING ACTIVITIES Net Income $ 110,343 $ 21,040 $ 98,234 Equity in undistributed (earnings) losses of subsidiaries (52,217) 33,430 (43,164) Other 761 1,708 (99) Net Cash Provided by Operating Activities 58,887 56,178 54,971 INVESTING ACTIVITIES Net investments in subsidiaries — — 176 Acquisitions — — (10) Net Cash Provided by Investing Activities — — 166 FINANCING ACTIVITIES Repayment of long term debt (9,750) — — Sale of treasury shares, net (629) (594) (915) Purchase of treasury shares — (12,559) (18,222) Cash dividends paid to common shareholders (44,324) (43,949) (37,360) Payment to repurchase of warrant — — — Net Cash Used in Financing Activities (54,703) (57,102) (56,497) Net decrease in cash 4,184 (924) (1,360) Cash at beginning of year 6,585 7,509 8,869 Cash at End of Year $ 10,769 $ 6,585 $ 7,509

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2021
Regulatory Capital Requirements Under Banking Regulations [Abstract]
Summary of Risk-Based Capital Amounts and Ratios	The following table summarizes risk-based capital amounts and ratios for S&T and S&T Bank: Actual Minimum To be (dollars in thousands) Amount Ratio Amount Ratio Amount Ratio As of December 31, 2021 Leverage Ratio S&T $ 889,785 9.74 % $ 365,535 4.00 % $ 456,918 5.00 % S&T Bank 864,127 9.46 % 365,544 4.00 % 456,930 5.00 % Common Equity Tier 1 (to Risk-Weighted Assets) S&T 860,785 12.03 % 322,109 4.50 % 465,268 6.50 % S&T Bank 864,127 12.09 % 321,711 4.50 % 464,694 6.50 % Tier 1 Capital (to Risk-Weighted Assets) S&T 889,785 12.43 % 429,479 6.00 % 572,638 8.00 % S&T Bank 864,127 12.09 % 428,948 6.00 % 571,931 8.00 % Total Capital (to Risk-Weighted Assets) S&T 987,420 13.79 % 572,638 8.00 % 715,798 10.00 % S&T Bank 961,762 13.45 % 571,931 8.00 % 714,913 10.00 % As of December 31, 2020 Leverage Ratio S&T $ 852,515 9.43 % $ 350,311 4.00 % $ 437,889 5.00 % S&T Bank 810,636 9.27 % 349,739 4.00 % 437,174 5.00 % Common Equity Tier 1 (to Risk-Weighted Assets) S&T 796,515 11.33 % 316,338 4.50 % 456,933 6.50 % S&T Bank 810,636 11.55 % 315,792 4.50 % 456,144 6.50 % Tier 1 Capital (to Risk-Weighted Assets) S&T 825,515 11.74 % 421,784 6.00 % 562,379 8.00 % S&T Bank 810,636 11.55 % 421,056 6.00 % 561,408 8.00 % Total Capital (to Risk-Weighted Assets) S&T 944,686 13.44 % 562,379 8.00 % 702,974 10.00 % S&T Bank 922,007 13.14 % 561,408 8.00 % 701,760 10.00 %

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details)	Nov. 30, 2020USD ($)	Nov. 30, 2019USD ($)	Dec. 31, 2021USD ($)subsidiaryentityreporting_unit	Dec. 31, 2020USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries | subsidiary			5
Percentage of outstanding common stock of investees accounted for using equity method of accounting			100.00%
Number of entities non-banking activities | entity			6
Goodwill			$ 373,424,000	$ 373,424,000
Prior period reclassification adjustment			$ 0
Period for satisfactory payment of TDRs			6 months
Threshold for evaluation for expected credit loss of commercial loans			$ 1,000,000
Number of reporting units | reporting_unit			1
Number of wholly owned trust subsidiaries | subsidiary			3
Minimum | Core Deposits And Customers Lists
Summary of Significant Accounting Policies [Line Items]
Weighted average estimated useful of acquired intangibles			10 years
Maximum
Summary of Significant Accounting Policies [Line Items]
Amortization period of investments in joint ventures			10 years
Maximum | Core Deposits And Customers Lists
Summary of Significant Accounting Policies [Line Items]
Weighted average estimated useful of acquired intangibles			20 years
Corporate Joint Venture | Common Wealth Trust Life Insurance Company
Summary of Significant Accounting Policies [Line Items]
Percentage of outstanding common stock of investees accounted for using equity method of accounting			50.00%
Interest rate lock commitments
Summary of Significant Accounting Policies [Line Items]
Period for interest rate lock commitment			60 days
DNB
Summary of Significant Accounting Policies [Line Items]
Fair value of consideration	$ 200,991,000	$ 200,991,000
Total assets acquired		1,100,000,000
Loans acquired		909,000,000
Goodwill	85,978,000	84,175,000		$ 86,000,000
Deposits acquired	$ 967,265,000	$ 967,265,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Estimated Useful Lives for Various Asset (Details)	12 Months Ended
	Dec. 31, 2021
Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives	25 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Other Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Vehicles
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years

Business Combinations - Narrati

Business Combinations - Narrative (Details)	Nov. 30, 2020USD ($)	Nov. 30, 2019USD ($)banking_location$ / sharesshares	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Business Acquisition [Line Items]
Goodwill			$ 373,424,000	$ 373,424,000
Adjustments, loans			6,700,000	8,600,000
Merger related expenses			0	2,342,000	$ 11,350,000
Professional services and legal			$ 6,368,000	6,394,000	4,244,000
DNB
Business Acquisition [Line Items]
Number of banking locations | banking_location		14
Shares of S&T offered for each share of DNB (in shares) | shares		1.22
Fair value of total consideration	$ 200,991,000	$ 200,991,000
Cash	360,000	$ 360,000
S&T common shares issued (in shares) | shares		5,318,964
S&T common shares issued, fair value (in USD per share) | $ / shares		$ 37.72
Goodwill	85,978,000	$ 84,175,000		86,000,000
Preliminary estimates adjustments	1,803,000
Adjustments, loans	2,377,000	8,143,000
Adjustments, borrowings	257,000	276,000
Adjustment, other liabilities	122,000	3,184,000
Adjustments, other assets	116,000	4,278,000
Adjustments, deferred income taxes	311,000	(3,298,000)
Carryover of allowance for credit losses	0	0
Fair value of loans acquired	$ 906,607,000	908,984,000
Discount on loans acquired		$ 10,500,000
Direct costs related to merger				13,700,000
Merger related expenses				2,300,000	11,400,000
Professional services and legal				200,000	2,800,000
Severance payments				1,400,000	3,400,000
Data processing, contract termination and conversion cost expenses				400,000	4,700,000
Other expenses				$ 300,000	$ 500,000

Business Combinations - Conside

Business Combinations - Consideration, Assets Acquired and Liabilities Assumed (Details) - USD ($)	Nov. 30, 2020	Nov. 30, 2019	Dec. 31, 2021	Dec. 31, 2020
Fair Value of Assets Acquired
Adjustments, Loans			$ (6,700,000)	$ (8,600,000)
Goodwill			373,424,000	373,424,000
Fair Value of Liabilities Assumed
Goodwill			373,424,000	373,424,000
As Recorded by DNB
Fair Value of Assets Acquired
Cash and cash equivalents		$ 64,119,000
Securities and other investments		108,715,000
Loans		917,127,000
Allowance for credit losses		(6,487,000)
Goodwill		15,525,000
Premises and equipment		6,782,000
Accrued interest receivable		4,138,000
Deferred income taxes		2,017,000
Core deposits and other intangible assets		269,000
Other assets		24,883,000
Total Assets Acquired		1,137,088,000
Fair Value of Liabilities Assumed
Deposits		966,263,000
Borrowings		37,617,000
Accrued interest payable and other liabilities		11,157,000
Total Liabilities Assumed		1,015,037,000
Total Net Assets Acquired		122,051,000
Identifiable Intangible Assets		269,000
Goodwill		15,525,000
DNB
Fair Value of Assets Acquired
Cash and cash equivalents	$ 64,119,000	64,119,000
Securities and other investments	108,898,000	108,898,000
Adjustments, Securities and other investments		183,000
Loans	906,607,000	908,984,000
Adjustments, Loans	(2,377,000)	(8,143,000)
Allowance for credit losses	0	0
Adjustments, Allowance for credit losses		6,487,000
Goodwill	85,978,000	84,175,000		86,000,000
Adjustments, Goodwill	1,803,000	(15,525,000)
Premises and equipment	14,872,000	14,872,000
Adjustments, Premises and equipment	0	8,090,000
Accrued interest receivable	4,138,000	4,138,000
Deferred income taxes	(970,000)	(1,281,000)
Adjustments, Deferred income taxes	311,000	(3,298,000)
Core deposits and other intangible assets			6,900,000
Adjustments, Core deposits and other intangible assets		(269,000)
Other assets	20,489,000	20,605,000
Adjustments, Other assets	(116,000)	(4,278,000)
Total Assets Acquired	1,118,153,000	1,120,335,000
Adjustments, Total Assets Acquired	(2,182,000)	(16,753,000)
Fair Value of Liabilities Assumed
Deposits	967,265,000	967,265,000
Adjustments, Deposits		1,002,000
Borrowings	37,084,000	37,341,000
Adjustments, Borrowings	(257,000)	(276,000)
Accrued interest payable and other liabilities	7,851,000	7,973,000
Adjustments, accrued interest payable and other liabilities	(122,000)	(3,184,000)
Total Liabilities Assumed	1,012,200,000	1,012,579,000
Adjustments, Total Liabilities Assumed	(379,000)	(2,458,000)
Total Net Assets Acquired	105,953,000	107,756,000
Adjustments, Total Net Assets Acquired	(1,803,000)	(14,295,000)
Identifiable Intangible Assets			$ 6,900,000
Total Fair Value of Net Assets Acquired and Identified	115,013,000	116,816,000
Adjustments, Total Fair Value of Net Assets Acquired and Identified	(1,803,000)
Cash	360,000	360,000
Common stock		200,631,000
Fair Value of Total Consideration	200,991,000	200,991,000
Goodwill	85,978,000	84,175,000		86,000,000
Core Deposits | DNB
Fair Value of Assets Acquired
Core deposits and other intangible assets	7,288,000	7,288,000
Adjustments, Core deposits and other intangible assets	0
Fair Value of Liabilities Assumed
Identifiable Intangible Assets	7,288,000	7,288,000
Wealth management | DNB
Fair Value of Assets Acquired
Core deposits and other intangible assets	1,772,000	1,772,000		300,000
Adjustments, Core deposits and other intangible assets	0
Fair Value of Liabilities Assumed
Identifiable Intangible Assets	$ 1,772,000	$ 1,772,000		$ 300,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerators for Earnings per Common Share—Basic and Diluted:
Net Income	$ 110,343	$ 21,040	$ 98,234
Less: Income allocated to participating shares	492	68	260
Net Income Allocated to Common Shareholders	$ 109,851	$ 20,972	$ 97,974
Denominators:
Weighted Average Common Shares Outstanding—Basic (in shares)	39,050,241	39,070,439	34,628,191
Add: Average participating shares outstanding (in shares)	2,720	2,780	51,287
Denominator for Diluted (in shares)	39,052,961	39,073,219	34,679,478
Earnings per common share—basic (in dollars per share)	$ 2.81	$ 0.54	$ 2.84
Earnings per common share—diluted (in dollars per share)	$ 2.81	$ 0.53	$ 2.82
Restricted Stock
Denominators:
Restricted stock considered anti-dilutive excluded from dilutive potential common shares (in shares)	793	1,242	12,686

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Debt securities available-for-sale	$ 909,651	$ 770,393
Marketable equity securities	1,142	3,300
U.S. Treasury securities
ASSETS
Debt securities available-for-sale	95,327	10,282
Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	70,348	82,904
Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	270,294	209,296
Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	56,793	67,778
Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	341,300	273,681
Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale	75,089	124,427
Fair Value Measurements, Recurring
ASSETS
Debt securities available-for-sale	909,651	770,393
Marketable equity securities	1,142	3,300
Total Securities	910,793	773,693
Securities held in a deferred compensation plan	10,230	6,794
Total Assets	954,956	861,706
LIABILITIES
Total Liabilities	33,631	79,418
Fair Value Measurements, Recurring | U.S. Treasury securities
ASSETS
Debt securities available-for-sale	95,327	10,282
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	70,348	82,904
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	270,294	209,296
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	56,793	67,778
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	341,300	273,681
Fair Value Measurements, Recurring | Corporate obligations
ASSETS
Debt securities available-for-sale	500	2,025
Fair Value Measurements, Recurring | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale	75,089	124,427
Fair Value Measurements, Recurring | Interest rate swaps
ASSETS
Derivative financial assets	33,528	78,319
LIABILITIES
Derivative financial liabilities	33,631	79,033
Fair Value Measurements, Recurring | Interest rate lock commitments
ASSETS
Derivative financial assets	401	2,900
Fair Value Measurements, Recurring | Forward sale contracts
ASSETS
Derivative financial assets	4
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements, Recurring | Level 1
ASSETS
Debt securities available-for-sale	95,327	10,282
Marketable equity securities	1,061	3,228
Total Securities	96,388	13,510
Securities held in a deferred compensation plan	10,230	6,794
Total Assets	106,618	20,304
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale	95,327	10,282
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Corporate obligations
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring | Level 1 | Forward sale contracts
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities		0
Fair Value Measurements, Recurring | Level 2
ASSETS
Debt securities available-for-sale	814,324	760,111
Marketable equity securities	81	72
Total Securities	814,405	760,183
Securities held in a deferred compensation plan	0	0
Total Assets	847,933	838,502
LIABILITIES
Total Liabilities	33,631	79,418
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	70,348	82,904
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	270,294	209,296
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	56,793	67,778
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	341,300	273,681
Fair Value Measurements, Recurring | Level 2 | Corporate obligations
ASSETS
Debt securities available-for-sale	500	2,025
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale	75,089	124,427
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets	33,528	78,319
LIABILITIES
Derivative financial liabilities	33,631	79,033
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements, Recurring | Level 3
ASSETS
Debt securities available-for-sale	0	0
Marketable equity securities	0	0
Total Securities	0	0
Securities held in a deferred compensation plan	0	0
Total Assets	405	2,900
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Corporate obligations
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets	401	2,900
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets	$ 4
LIABILITIES
Derivative financial liabilities		$ 0

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis by Significant Unobservable Inputs (Details) - Fair Value, Measurements, Nonrecurring	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on nonrecurring basis	$ 0	$ 0
Level 3
ASSETS
Total Assets	17,015,000	70,448,000
Collateral method | Level 3
ASSETS
Loans individually evaluated	16,004,000	64,286,000
Other real estate owned	1,011,000	600,000
Loans held for sale	0	586,000
Discounted cash flow method | Level 3
ASSETS
Loans individually evaluated	16,004,000
Mortgage servicing rights	$ 0	$ 4,976,000
Appraisal adjustment | Collateral method | Level 3
ASSETS
Other real estate owned, measurement input	0.0253	0.2180
Minimum | Appraisal adjustment | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0	0
Minimum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input	0.10	0
Mortgage servicing rights, measurement input		0.0924
Minimum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input		0.0882
Maximum | Appraisal adjustment | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0.20	0.12
Maximum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input	0.19	0
Mortgage servicing rights, measurement input		0.1255
Maximum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input		0.1458
Weighted Average | Appraisal adjustment | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0.0448	0.0770
Other real estate owned, measurement input	0.0253	0.2180
Weighted Average | Discount rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input	0.1046	0
Mortgage servicing rights, measurement input		0.0942
Weighted Average | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input		0.1337

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Securities	$ 910,793	$ 773,693
Loans held for sale	1,522	18,528
LIABILITIES
Junior subordinated debt securities	54,393	64,083	$ 64,277
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	922,215	229,666
Securities	910,793	773,693
Loans held for sale	1,522	18,528
Portfolio loans, net	6,901,414	7,108,248
Collateral receivable	37,363
Securities held in a deferred compensation plan	10,230	77,936
Mortgage servicing rights	7,677	6,794
LIABILITIES
Deposits	7,996,524	7,420,538
Securities sold under repurchase agreements	84,491	65,163
Short-term borrowings	0	75,000
Long-term borrowings	22,430	23,681
Junior subordinated debt securities	54,393	64,083
Carrying Value | Interest rate swaps
ASSETS
Derivative financial assets	33,528	4,976
LIABILITIES
Derivative financial liabilities	33,631	79,033
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets	401	78,319
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets	4	2,900
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	922,215	229,666
Securities	910,793	773,693
Loans held for sale	1,522	18,528
Portfolio loans, net	6,815,468	7,028,446
Collateral receivable	37,363
Securities held in a deferred compensation plan	10,230	77,936
Mortgage servicing rights	7,677	6,794
LIABILITIES
Deposits	7,992,942	7,422,894
Securities sold under repurchase agreements	84,491	65,163
Short-term borrowings	0	75,000
Long-term borrowings	22,678	24,545
Junior subordinated debt securities	54,393	64,083
Fair Value Measurements | Interest rate swaps
ASSETS
Derivative financial assets	33,528	4,976
LIABILITIES
Derivative financial liabilities	33,631	79,033
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets	401	78,319
Fair Value Measurements | Forward sale contracts
ASSETS
Derivative financial assets	4	2,900
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits	922,215	229,666
Securities	96,388	13,510
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable	37,363
Securities held in a deferred compensation plan	10,230	77,936
Mortgage servicing rights	0	6,794
LIABILITIES
Deposits	6,908,453	6,033,075
Securities sold under repurchase agreements	84,491	65,163
Short-term borrowings	0	75,000
Long-term borrowings	4,300	4,494
Junior subordinated debt securities	54,393	64,083
Fair Value Measurements | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements | Level 1 | Forward sale contracts
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities		0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities	814,405	760,183
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	0	0
LIABILITIES
Deposits	1,084,489	1,389,819
Securities sold under repurchase agreements	0	0
Short-term borrowings	0	0
Long-term borrowings	18,378	20,051
Junior subordinated debt securities	0	0
Fair Value Measurements | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets	33,528	0
LIABILITIES
Derivative financial liabilities	33,631	79,033
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	78,319
Fair Value Measurements | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities	0	0
Loans held for sale	1,522	18,528
Portfolio loans, net	6,815,468	7,028,446
Collateral receivable	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	7,677	0
LIABILITIES
Deposits	0	0
Securities sold under repurchase agreements	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated debt securities	0	0
Fair Value Measurements | Level 3 | Interest rate swaps
ASSETS
Derivative financial assets	0	4,976
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets	401	0
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets	$ 4	2,900
LIABILITIES
Derivative financial liabilities		$ 0

Restrictions on Cash and Due _2

Restrictions on Cash and Due from Bank Accounts (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Abstract]
Reserved cash maintained at Federal Reserve	$ 0	$ 15.5	$ 43.9

Dividend and Loan Restrictions

Dividend and Loan Restrictions (Details)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Percentage of collateralized loans	10.00%

Securities - Composition of Sec

Securities - Composition of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	$ 909,651	$ 770,393
Marketable equity securities	1,142	3,300
Total Securities	910,793	773,693
Total Debt Securities, Available-for-sale, Amortized Cost	900,235	737,005
Gross Unrealized Gains	15,183	33,478
Gross Unrealized Losses	(5,767)	(90)
Fair Value	909,651	770,393
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	95,327	10,282
Total Debt Securities, Available-for-sale, Amortized Cost	95,954	9,980
Gross Unrealized Gains	115	302
Gross Unrealized Losses	(742)	0
Fair Value	95,327	10,282
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	70,348	82,904
Total Debt Securities, Available-for-sale, Amortized Cost	68,599	78,755
Gross Unrealized Gains	1,749	4,149
Gross Unrealized Losses	0	0
Fair Value	70,348	82,904
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	270,294	209,296
Total Debt Securities, Available-for-sale, Amortized Cost	270,696	202,975
Gross Unrealized Gains	2,408	6,410
Gross Unrealized Losses	(2,810)	(89)
Fair Value	270,294	209,296
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	56,793	67,778
Total Debt Securities, Available-for-sale, Amortized Cost	57,029	66,960
Gross Unrealized Gains	392	818
Gross Unrealized Losses	(628)	0
Fair Value	56,793	67,778
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	341,300	273,681
Total Debt Securities, Available-for-sale, Amortized Cost	336,918	258,875
Gross Unrealized Gains	5,969	14,806
Gross Unrealized Losses	(1,587)	0
Fair Value	341,300	273,681
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	500	2,025
Total Debt Securities, Available-for-sale, Amortized Cost	500	2,021
Gross Unrealized Gains	0	5
Gross Unrealized Losses	0	(1)
Fair Value	500	2,025
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt securities available-for-sale	75,089	124,427
Total Debt Securities, Available-for-sale, Amortized Cost	70,539	117,439
Gross Unrealized Gains	4,550	6,988
Gross Unrealized Losses	0	0
Fair Value	$ 75,089	$ 124,427

Securities - Gross and Net Real

Securities - Gross and Net Realized Gains and Losses on Sale of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 29	$ 219	$ 41
Gross realized losses	0	(77)	(67)
Net Realized Gains/(Losses)	$ 29	$ 142	$ (26)

Securities - Fair Value and Age

Securities - Fair Value and Age of Gross Unrealized Losses by Investment Category (Details) $ in Thousands	Dec. 31, 2021USD ($)security	Dec. 31, 2020USD ($)security
Number of Securities
Less Than 12 Months | security	30	3
12 Months or More | security	1	0
Total | security	31	3
Fair Value
Less Than 12 Months	$ 372,499	$ 36,196
12 Months or More	8,933	0
Total	381,432	36,196
Unrealized Losses
Less Than 12 Months	(5,393)	(90)
12 Months or More	(374)	0
Total	$ (5,767)	$ (90)
U.S. Treasury securities
Number of Securities
Less Than 12 Months | security	8	0
12 Months or More | security	0	0
Total | security	8	0
Fair Value
Less Than 12 Months	$ 85,221	$ 0
12 Months or More	0	0
Total	85,221	0
Unrealized Losses
Less Than 12 Months	(742)	0
12 Months or More	0	0
Total	$ (742)	$ 0
Collateralized mortgage obligations of U.S. government corporations and agencies
Number of Securities
Less Than 12 Months | security	12	2
12 Months or More | security	1	0
Total | security	13	2
Fair Value
Less Than 12 Months	$ 141,204	$ 35,697
12 Months or More	8,933	0
Total	150,137	35,697
Unrealized Losses
Less Than 12 Months	(2,436)	(89)
12 Months or More	(374)	0
Total	$ (2,810)	$ (89)
Residential mortgage-backed securities of U.S. government corporations and agencies
Number of Securities
Less Than 12 Months | security	3	0
12 Months or More | security	0	0
Total | security	3	0
Fair Value
Less Than 12 Months	$ 46,042	$ 0
12 Months or More	0	0
Total	46,042	0
Unrealized Losses
Less Than 12 Months	(628)	0
12 Months or More	0	0
Total	$ (628)	$ 0
Commercial mortgage-backed securities of U.S. government corporations and agencies
Number of Securities
Less Than 12 Months | security	7
12 Months or More | security	0	0
Total | security	7	0
Fair Value
Less Than 12 Months	$ 100,032
12 Months or More	0	0
Total	100,032	0
Unrealized Losses
Less Than 12 Months	(1,587)
12 Months or More	0	0
Total	$ (1,587)	$ 0
Corporate Obligations
Number of Securities
Less Than 12 Months | security	0	1
12 Months or More | security	0	0
Total | security	0	1
Fair Value
Less Than 12 Months	$ 0	$ 499
12 Months or More	0	0
Total	0	499
Unrealized Losses
Less Than 12 Months	0	(1)
12 Months or More	0	0
Total	$ 0	$ (1)

Securities - Narrative (Details

Securities - Narrative (Details) $ in Millions	Dec. 31, 2021USD ($)security	Dec. 31, 2020USD ($)security
Investments, Debt and Equity Securities [Abstract]
Number of debt securities in unrealized loss position | security	31	3
Securities pledged for regulatory and legal requirements | $	$ 466.9	$ 308.3

Securities - Unrealized Gains (

Securities - Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total unrealized gains/(losses) on debt securities available-for-sale
Gross Unrealized Gains	$ 15,183	$ 33,478
Gross Unrealized Losses	(5,767)	(90)
Net Unrealized Gains (Losses)	9,416	33,388
Income tax (expense) benefit, Gross Unrealized Gains	(3,215)	(7,128)
Income tax (expense) benefit, Gross Unrealized Losses	1,221	19
Income tax (expense) benefit, Net Unrealized (Losses)/Gains	(1,994)	(7,109)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains	11,968	26,350
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses	(4,546)	(71)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/(Losses)	$ 7,422	$ 26,279

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 43,513
Due after one year through five years	63,849
Due after five years through ten years	106,881
Due after ten years	20,849
Debt Securities Available-for-Sale With Maturities	235,092
Total Debt Securities, Available-for-sale, Amortized Cost	900,235	$ 737,005
Fair Value
Due in one year or less	44,027
Due after one year through five years	66,363
Due after five years through ten years	107,427
Due after ten years	22,947
Debt Securities Available-for-Sale With Maturities	240,764
Total Debt Securities Available-for-Sale	909,651	770,393
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Debt Securities Available-for-Sale With Maturities	270,696
Total Debt Securities, Available-for-sale, Amortized Cost	270,696	202,975
Fair Value
Debt Securities Available-for-Sale With Maturities	270,294
Total Debt Securities Available-for-Sale	270,294	209,296
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Debt Securities Available-for-Sale With Maturities	57,029
Total Debt Securities, Available-for-sale, Amortized Cost	57,029	66,960
Fair Value
Debt Securities Available-for-Sale With Maturities	56,793
Total Debt Securities Available-for-Sale	56,793	67,778
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Debt Securities Available-for-Sale With Maturities	336,918
Total Debt Securities, Available-for-sale, Amortized Cost	336,918	258,875
Fair Value
Debt Securities Available-for-Sale With Maturities	341,300
Total Debt Securities Available-for-Sale	341,300	273,681
Corporate Obligations
Amortized Cost
Debt Securities Available-for-Sale With Maturities	500
Total Debt Securities, Available-for-sale, Amortized Cost	500	2,021
Fair Value
Debt Securities Available-for-Sale With Maturities	500
Total Debt Securities Available-for-Sale	$ 500	$ 2,025

Securities - Unrealized Gains_2

Securities - Unrealized Gains (Losses) on Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Net market gains (losses) recognized	$ 189	$ (500)	$ 334
Less: Net gains recognized for equity securities sold	29	142	0
Unrealized Gains (Losses) on Equity Securities Still Held	$ 160	$ (642)	$ 334

Loans and Loans Held for Sale -

Loans and Loans Held for Sale - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)loanSecurityLoan	Dec. 31, 2020USD ($)loanSecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unearned income	$ 14,100	$ 16,000
Purchase accounting fair value adjustments	6,700	8,600
Financing receivable, excluding accrued interest, after allowance for credit loss	6,901,414	7,108,248
Portfolio loans, net of unearned income	6,999,990	7,225,860
Portfolio loans, net of unearned income	$ 6,999,990	$ 7,225,860
Number of commitments to lend additional funds | loan	12	20
Commitment to lend additional funds	$ 2,600	$ 800
Number of TDRs returned back to accruing status | loan	0	1
Financial receivable trouble debt restructuring reclassified to accruing trouble debt restructuring status		$ 100
Minimum period of loan payment defaults following restructure for TDRs to be in default (in days)	90 days
Number of TDRs defaulted that were restructured within the last 12 months prior to defaulting | loan	0	6
Financial receivable defaulted trouble debt restructuring loans restructured within twelve months prior to defaulting		$ 11,800
CARES Act, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of modified loans | loan	8	52
Modified loans	$ 28,800	$ 195,600
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	$ 5,406,584	$ 5,673,707
Percentage of commercial loans in total portfolio loans	77.20%	78.50%
Commercial | CARES Act, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, excluding accrued interest, after allowance for credit loss		$ 465,000
Number of modified loans | SecurityLoan	8	52
Modified loans	$ 28,800	$ 195,600
Business Banking Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	1,100,000	1,200,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	1,593,406	1,552,153
CARES Act, Paycheck Protection Program Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, after allowance for credit loss	88,300
Commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	2,690,528	2,791,947
Commercial real estate | Business Banking Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	546,100	453,000
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	1,513,523	1,559,552
Commercial and industrial | Business Banking Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	215,400	394,900
Commercial and industrial | Business Banking Portfolio Segment | CARES Act, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	39,700	178,400
Commercial construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	424,755	466,077
Commercial construction | Business Banking Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	16,200	8,200
Consumer real estate | Business Banking Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	357,900
Consumer real estate | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	1,127,585	1,167,332
Business banking | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	1,135,693	1,160,067
Business banking | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income		303,900
CRE and Commercial Construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, net of unearned income	$ 3,700,000	$ 3,700,000
Combined percentage of commercial real estate and commercial construction in total commercial loans	68.00%	65.60%
Combined percentage of commercial real estate and commercial construction in total portfolio loans	52.50%	51.50%
Out-of-state exposure of combined portfolio	5.70%	5.90%
Percentage of total loans out-of-state excluding contiguous states	3.00%	3.00%

Loans and Loans Held for Sale_2

Loans and Loans Held for Sale - Composition of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Composition of Loans
Portfolio loans, net of unearned income	$ 6,999,990	$ 7,225,860
Loans held for sale	1,522	18,528
Total Loans	7,001,512	7,244,388
Interest receivable	18,700	24,700
Commercial
Composition of Loans
Portfolio loans, net of unearned income	5,406,584	5,673,707
Commercial | Commercial real estate
Composition of Loans
Portfolio loans, net of unearned income	3,236,653	3,244,974
Commercial | Commercial and industrial
Composition of Loans
Portfolio loans, net of unearned income	1,728,969	1,954,453
Commercial | Commercial construction
Composition of Loans
Portfolio loans, net of unearned income	440,962	474,280
Consumer
Composition of Loans
Portfolio loans, net of unearned income	1,593,406	1,552,153
Consumer | Consumer real estate
Composition of Loans
Portfolio loans, net of unearned income	1,485,478	1,471,238
Consumer | Installment and other consumer
Composition of Loans
Portfolio loans, net of unearned income	$ 107,928	$ 80,915

Loans and Loans Held for Sale_3

Loans and Loans Held for Sale - Summary of Restructured Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 17,575	$ 22,651
Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	1,300	4,791
Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	11,221	13,620
Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	2,087	2,330
Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	1,721	260
Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	1,246	1,646
Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	4
Total TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	31,695	46,748
Total TDRs | Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	1,697	16,668
Total TDRs | Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	15,637	16,975
Total TDRs | Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	4,277	3,267
Total TDRs | Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	2,554	1,933
Total TDRs | Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	7,527	7,900
Total TDRs | Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	3	5
Performing TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	9,921	17,460
Performing TDRs | Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	14
Performing TDRs | Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	748	7,090
Performing TDRs | Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	2,190	3,267
Performing TDRs | Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	858	1,503
Performing TDRs | Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	6,122	5,581
Performing TDRs | Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	3	5
Nonperforming TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans		29,289
Nonperforming TDRs | Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	1,697	16,654
Nonperforming TDRs | Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	14,889	9,885
Nonperforming TDRs | Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	2,087	0
Nonperforming TDRs | Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	1,696	430
Nonperforming TDRs | Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	1,405	2,319
Nonperforming TDRs | Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 0	$ 0

Loans and Loans Held for Sale_4

Loans and Loans Held for Sale - Restructured Loans by Type of Concession (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)loan	Dec. 31, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	40	40
Pre-Modification Outstanding Recorded Investment	$ 31,472	$ 25,295
Post-Modification Outstanding Recorded Investment	17,575	22,651
Bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	1,107	960
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Extend Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	4,684	16,524
Modify Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Modify Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 11,784	$ 5,167
Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1	1
Pre-Modification Outstanding Recorded Investment	$ 1,824	$ 5,292
Post-Modification Outstanding Recorded Investment	1,300	4,791
Commercial real estate | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial real estate | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial real estate | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial real estate | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial real estate | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 1,300	$ 4,791
Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	3	3
Pre-Modification Outstanding Recorded Investment	$ 21,297	$ 15,217
Post-Modification Outstanding Recorded Investment	11,221	13,620
Commercial and industrial | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial and industrial | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial and industrial | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	2,039	13,339
Commercial and industrial | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial and industrial | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 9,182	$ 281
Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1	3
Pre-Modification Outstanding Recorded Investment	$ 5,279	$ 2,592
Post-Modification Outstanding Recorded Investment	2,087	2,330
Commercial construction | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial construction | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial construction | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	2,087	2,330
Commercial construction | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Commercial construction | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	9	3
Pre-Modification Outstanding Recorded Investment	$ 1,792	$ 501
Post-Modification Outstanding Recorded Investment	1,721	260
Business banking | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	8	0
Business banking | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Business banking | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	558	165
Business banking | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Business banking | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 1,155	$ 95
Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	26	29
Pre-Modification Outstanding Recorded Investment	$ 1,280	$ 1,688
Post-Modification Outstanding Recorded Investment	1,246	1,646
Consumer real estate | Bankruptcy | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	1,099	956
Consumer real estate | Other | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Consumer real estate | Extend Maturity | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	690
Consumer real estate | Modify Rate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Consumer real estate | Modify Payments | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 147	$ 0
Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 5
Post-Modification Outstanding Recorded Investment	0	4
Other consumer | Bankruptcy | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	4
Other consumer | Other | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Other consumer | Extend Maturity | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Other consumer | Modify Rate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0
Other consumer | Modify Payments | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0

Loans and Loans Held for Sale_5

Loans and Loans Held for Sale - Summary of Nonperforming Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Nonperforming Assets
Nonaccrual loans	$ 44,517	$ 117,485
Nonaccrual TDRs	21,774	29,289
Total nonaccrual loans	66,291	146,774	$ 54,057
OREO	13,313	2,155
Total Nonperforming Assets	$ 79,604	$ 148,929

Loans and Loans Held for Sale_6

Loans and Loans Held for Sale - Summary of Aggregate Amount of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loans Receivable from Officers and Directors [Roll Forward]
Balance at beginning of year	$ 6,329	$ 8,225
New loans	1,826	3,343
Repayments or no longer considered a related party	(1,998)	(5,239)
Balance at end of year	$ 6,157	$ 6,329

Allowance for Credit Losses - L

Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,380,130	$ 1,360,684
Year two	772,783	1,214,746
Year three	961,071	831,734
Year four	606,970	565,201
Year five	431,724	610,556
More than five years	1,591,979	1,572,826
Revolving	1,226,925	1,041,199
Revolving-Term	28,408	28,914
Total	6,999,990	7,225,860
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	385,347	334,086
Year two	317,359	476,203
Year three	468,720	417,944
Year four	334,743	320,140
Year five	266,019	415,184
More than five years	881,391	780,560
Revolving	36,948	47,830
Revolving-Term	0	0
Total	2,690,528	2,791,947
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	437,529	457,828
Year two	126,371	215,457
Year three	134,417	145,290
Year four	86,912	82,249
Year five	41,422	28,488
More than five years	136,470	221,609
Revolving	550,402	408,631
Revolving-Term	0	0
Total	1,513,523	1,559,552
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	142,321	132,813
Year two	110,562	230,907
Year three	113,532	63,535
Year four	16,838	2,921
Year five	989	6,346
More than five years	10,477	16,777
Revolving	30,036	12,778
Revolving-Term	0	0
Total	424,755	466,077
Commercial | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	257,409	296,357
Year two	108,048	156,473
Year three	144,976	128,250
Year four	115,228	91,363
Year five	81,889	82,202
More than five years	318,735	298,779
Revolving	108,230	105,549
Revolving-Term	1,179	1,094
Total	1,135,693	1,160,067
Commercial | Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	385,347	334,086
Year two	316,003	422,800
Year three	412,191	394,963
Year four	314,303	277,724
Year five	213,019	307,321
More than five years	698,992	615,217
Revolving	35,448	46,330
Revolving-Term	0	0
Total	2,375,303	2,398,441
Commercial | Pass | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	437,483	454,131
Year two	126,371	199,453
Year three	115,359	140,049
Year four	83,030	68,607
Year five	37,176	27,645
More than five years	132,182	206,782
Revolving	536,554	383,082
Revolving-Term	0	0
Total	1,468,155	1,479,749
Commercial | Pass | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	142,321	131,235
Year two	108,405	224,794
Year three	111,512	59,649
Year four	16,838	2,420
Year five	989	6,346
More than five years	3,539	4,555
Revolving	30,036	12,778
Revolving-Term	0	0
Total	413,640	441,777
Commercial | Pass | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	257,264	296,254
Year two	107,791	154,335
Year three	141,411	123,207
Year four	110,586	86,552
Year five	79,187	77,238
More than five years	293,215	266,042
Revolving	107,093	103,571
Revolving-Term	443	291
Total	1,096,990	1,107,490
Commercial | Special Mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	35,499
Year three	37,786	10,200
Year four	6,401	22,502
Year five	40,445	55,174
More than five years	75,938	75,022
Revolving	0	0
Revolving-Term	0	0
Total	160,570	198,397
Commercial | Special Mention | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	46	3,697
Year two	0	8,211
Year three	3,060	2,628
Year four	2,546	697
Year five	72	768
More than five years	832	1,046
Revolving	8,887	23,527
Revolving-Term	0	0
Total	15,443	40,574
Commercial | Special Mention | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	1,578
Year two	0	2,533
Year three	0	3,886
Year four	0	0
Year five	0	0
More than five years	4,458	8,593
Revolving	0	0
Revolving-Term	0	0
Total	4,458	16,590
Commercial | Special Mention | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	104	0
Year two	151	1,060
Year three	1,986	1,147
Year four	1,365	1,602
Year five	1,057	1,084
More than five years	5,929	6,866
Revolving	160	637
Revolving-Term	111	123
Total	10,863	12,519
Commercial | Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	1,356	17,259
Year three	18,743	12,781
Year four	14,039	19,914
Year five	12,555	50,700
More than five years	106,461	83,792
Revolving	1,500	1,500
Revolving-Term	0	0
Total	154,654	185,946
Commercial | Substandard | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	7,793
Year three	14,221	2,613
Year four	1,336	8,544
Year five	4,174	75
More than five years	3,456	13,781
Revolving	4,961	2,022
Revolving-Term	0	0
Total	28,148	34,828
Commercial | Substandard | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	2,157	3,580
Year three	2,020	0
Year four	0	501
Year five	0	0
More than five years	2,480	3,629
Revolving	0	0
Revolving-Term	0	0
Total	6,657	7,710
Commercial | Substandard | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	41	103
Year two	106	1,078
Year three	1,579	3,896
Year four	3,277	3,209
Year five	1,645	3,880
More than five years	19,591	25,871
Revolving	977	1,341
Revolving-Term	625	680
Total	27,841	40,058
Commercial | Doubtful | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	645
Year three	0	0
Year four	0	0
Year five	0	1,989
More than five years	0	6,529
Revolving	0	0
Revolving-Term	0	0
Total	0	9,163
Commercial | Doubtful | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	1,777	0
Year four	0	4,401
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	1,777	4,401
Commercial | Doubtful | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	0	0
Commercial | Doubtful | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	0	0
Consumer | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	137,465	120,736
Year two	100,995	122,544
Year three	92,165	69,931
Year four	50,156	65,133
Year five	40,384	76,254
More than five years	238,462	251,047
Revolving	443,406	439,020
Revolving-Term	24,552	22,667
Total	1,127,585	1,167,332
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20,059	18,864
Year two	9,448	13,162
Year three	7,261	6,784
Year four	3,093	3,395
Year five	1,021	2,082
More than five years	6,444	4,054
Revolving	57,903	27,391
Revolving-Term	2,677	5,153
Total	107,906	80,885
Consumer | Pass | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	137,465	120,736
Year two	100,995	122,171
Year three	91,981	67,700
Year four	48,531	63,653
Year five	39,029	73,805
More than five years	231,861	243,939
Revolving	442,530	438,888
Revolving-Term	23,391	22,667
Total	1,115,783	1,153,559
Consumer | Pass | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,976	18,849
Year two	9,396	13,162
Year three	7,120	6,784
Year four	2,878	3,395
Year five	613	2,082
More than five years	2,037	687
Revolving	57,702	26,647
Revolving-Term	1,130	2,767
Total	100,852	74,373
Consumer | Special Mention | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	1,489
Year four	0	0
Year five	0	0
More than five years	937	150
Revolving	0	132
Revolving-Term	0	0
Total	937	1,771
Consumer | Special Mention | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	0	0
Consumer | Substandard | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	373
Year three	184	742
Year four	1,625	1,480
Year five	1,355	2,449
More than five years	5,664	6,958
Revolving	876	0
Revolving-Term	1,161	0
Total	10,865	12,002
Consumer | Substandard | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	83	15
Year two	52	0
Year three	141	0
Year four	215	0
Year five	408	0
More than five years	4,407	3,367
Revolving	201	744
Revolving-Term	1,547	2,386
Total	7,054	6,512
Consumer | Doubtful | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	0	0
Consumer | Doubtful | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	$ 0	$ 0

Allowance for Credit Losses -_2

Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,380,130	$ 1,360,684
Year two	772,783	1,214,746
Year three	961,071	831,734
Year four	606,970	565,201
Year five	431,724	610,556
More than five years	1,591,979	1,572,826
Revolving	1,226,925	1,041,199
Revolving-Term	28,408	28,914
Total	6,999,990	7,225,860
Performing TDRs
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,380,089	1,360,654
Year two	771,819	1,196,491
Year three	940,641	827,625
Year four	602,938	543,253
Year five	421,125	586,622
More than five years	1,564,501	1,496,135
Revolving	1,224,949	1,040,544
Revolving-Term	27,638	27,762
Total	6,933,699	7,079,086
Nonperforming TDRs
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	41	30
Year two	964	18,254
Year three	20,430	4,108
Year four	4,032	21,948
Year five	10,599	23,934
More than five years	27,478	76,691
Revolving	1,976	654
Revolving-Term	770	1,153
Total	66,291	146,774
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	385,347	334,086
Year two	317,359	476,203
Year three	468,720	417,944
Year four	334,743	320,140
Year five	266,019	415,184
More than five years	881,391	780,560
Revolving	36,948	47,830
Revolving-Term	0	0
Total	2,690,528	2,791,947
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	437,529	457,828
Year two	126,371	215,457
Year three	134,417	145,290
Year four	86,912	82,249
Year five	41,422	28,488
More than five years	136,470	221,609
Revolving	550,402	408,631
Revolving-Term	0	0
Total	1,513,523	1,559,552
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	142,321	132,813
Year two	110,562	230,907
Year three	113,532	63,535
Year four	16,838	2,921
Year five	989	6,346
More than five years	10,477	16,777
Revolving	30,036	12,778
Revolving-Term	0	0
Total	424,755	466,077
Commercial | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	257,409	296,357
Year two	108,048	156,473
Year three	144,976	128,250
Year four	115,228	91,363
Year five	81,889	82,202
More than five years	318,735	298,779
Revolving	108,230	105,549
Revolving-Term	1,179	1,094
Total	1,135,693	1,160,067
Commercial | Performing TDRs | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	385,347	334,086
Year two	317,359	459,799
Year three	461,613	417,944
Year four	332,482	313,465
Year five	259,723	394,972
More than five years	865,567	722,782
Revolving	36,948	47,830
Revolving-Term	0	0
Total	2,659,039	2,690,879
Commercial | Performing TDRs | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	437,529	457,828
Year two	126,371	214,144
Year three	123,944	143,706
Year four	86,852	69,411
Year five	38,540	28,426
More than five years	136,427	220,701
Revolving	548,622	408,350
Revolving-Term	0	0
Total	1,498,285	1,542,566
Commercial | Performing TDRs | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	142,321	132,813
Year two	110,562	230,907
Year three	111,445	63,535
Year four	16,838	2,921
Year five	989	6,346
More than five years	10,093	16,393
Revolving	30,036	12,778
Revolving-Term	0	0
Total	422,284	465,692
Commercial | Performing TDRs | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	257,368	296,327
Year two	107,984	156,164
Year three	144,689	126,432
Year four	113,820	90,414
Year five	81,195	80,106
More than five years	311,673	286,970
Revolving	108,202	105,494
Revolving-Term	1,122	1,037
Total	1,126,052	1,142,944
Commercial | Nonperforming TDRs | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two		16,404
Year three	7,107	0
Year four	2,261	6,675
Year five	6,296	20,212
More than five years	15,824	57,778
Revolving	0	0
Revolving-Term	0	0
Total	31,488	101,070
Commercial | Nonperforming TDRs | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	1,313
Year three	10,473	1,584
Year four	60	12,838
Year five	2,882	62
More than five years	43	908
Revolving	1,780	281
Revolving-Term	0	0
Total	15,239	16,985
Commercial | Nonperforming TDRs | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	2,087	0
Year four	0	0
Year five	0	0
More than five years	384	384
Revolving	0	0
Revolving-Term	0	0
Total	2,471	384
Commercial | Nonperforming TDRs | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	41	30
Year two	64	309
Year three	287	1,818
Year four	1,408	949
Year five	694	2,096
More than five years	7,062	11,809
Revolving	28	55
Revolving-Term	57	57
Total	9,641	17,123
Consumer | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	137,465	120,736
Year two	100,995	122,544
Year three	92,165	69,931
Year four	50,156	65,133
Year five	40,384	76,254
More than five years	238,462	251,047
Revolving	443,406	439,020
Revolving-Term	24,552	22,667
Total	1,127,585	1,167,332
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20,059	18,864
Year two	9,448	13,162
Year three	7,261	6,784
Year four	3,093	3,395
Year five	1,021	2,082
More than five years	6,444	4,054
Revolving	57,903	27,391
Revolving-Term	2,677	5,153
Total	107,906	80,885
Consumer | Performing TDRs | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	137,465	120,736
Year two	100,253	122,315
Year three	91,689	69,225
Year four	49,853	63,647
Year five	39,657	74,690
More than five years	234,297	245,331
Revolving	443,238	438,702
Revolving-Term	23,839	21,572
Total	1,120,291	1,156,216
Consumer | Performing TDRs | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20,059	18,864
Year two	9,290	13,162
Year three	7,261	6,784
Year four	3,093	3,395
Year five	1,021	2,082
More than five years	6,444	3,958
Revolving	57,903	27,391
Revolving-Term	2,677	5,153
Total	107,748	80,789
Consumer | Nonperforming TDRs | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	742	229
Year three	476	706
Year four	303	1,486
Year five	727	1,564
More than five years	4,165	5,716
Revolving	168	318
Revolving-Term	713	1,096
Total	7,294	11,116
Consumer | Nonperforming TDRs | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	158	0
Year three	0	0
Year four	0	0
Year five	0	0
More than five years	0	96
Revolving	0	0
Revolving-Term	0	0
Total	$ 158	$ 96

Allowance for Credit Losses - A

Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)loanSecurityLoan	Dec. 31, 2020USD ($)SecurityLoanloan	Dec. 31, 2019USD ($)
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	$ 6,999,990	$ 7,225,860
Non- performing	$ 66,291	$ 146,774	$ 54,057
CARES Act, Paycheck Protection Program Loans
Financing Receivable, Past Due [Line Items]
Number of modified loans | loan	8	52
Modified loans	$ 28,800	$ 195,600
Current
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	6,927,943	7,069,730
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	3,085	2,888
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	2,672	5,965
90 Days + Past Due
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income		503
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	$ 72,048	$ 156,130
Commercial | CARES Act, Paycheck Protection Program Loans
Financing Receivable, Past Due [Line Items]
Number of modified loans | SecurityLoan	8	52
Modified loans	$ 28,800	$ 195,600
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	2,690,528	2,791,947
Non- performing	31,488	101,070	25,356
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	1,513,523	1,559,552
Non- performing	15,239	16,985	10,911
Commercial | Commercial construction
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	424,755	466,077
Non- performing	2,471	384	737
Commercial | Business banking
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	1,135,693	1,160,067
Non- performing	9,641	17,122	9,863
Commercial | Current | Commercial real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	2,659,040	2,690,877
Commercial | Current | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	1,497,755	1,542,567
Commercial | Current | Commercial construction
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	421,834	462,094
Commercial | Current | Business banking
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	1,124,748	1,140,581
Commercial | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	0	0
Commercial | 30-59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	529	0
Commercial | 30-59 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	450	19
Commercial | 30-59 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	813	1,614
Commercial | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	0	0
Commercial | 60-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	0	0
Commercial | 60-89 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	0	3,580
Commercial | 60-89 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	491	379
Commercial | 90 Days + Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income		0
Commercial | 90 Days + Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income		0
Commercial | 90 Days + Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income		0
Commercial | 90 Days + Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income		371
Commercial | Total Past Due Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	31,488	101,070
Commercial | Total Past Due Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	15,768	16,985
Commercial | Total Past Due Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	2,921	3,983
Commercial | Total Past Due Loans | Business banking
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	10,945	19,486
Consumer | Consumer real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	1,127,585	1,167,332
Non- performing	7,294	11,117	6,063
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	107,906	80,885
Non- performing	158	96	$ 1,127
Consumer | Current | Consumer real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	1,117,073	1,153,028
Consumer | Current | Other consumer
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	107,492	80,583
Consumer | 30-59 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	1,087	1,087
Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	206	168
Consumer | 60-89 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	2,130	1,968
Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	50	37
Consumer | 90 Days + Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income		132
Consumer | 90 Days + Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income		0
Consumer | Total Past Due Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	10,512	14,304
Consumer | Total Past Due Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Portfolio loans, net of unearned income	$ 414	$ 302

Allowance for Credit Losses -_3

Allowance for Credit Losses - Loans on Nonaccrual Status and Loans Past Due 90 Days or More and Still Accruing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	$ 146,774	$ 54,057
End of Period Nonaccrual	66,291	146,774
Nonaccrual With No Related Allowance	37,469	71,410
Past Due 90+ Days Still Accruing		503
Interest Income Recognized on Nonaccrual	1,128	826
Commercial | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	101,070	25,356
End of Period Nonaccrual	31,488	101,070
Nonaccrual With No Related Allowance	28,046	60,401
Past Due 90+ Days Still Accruing		0
Interest Income Recognized on Nonaccrual	158	22
Commercial | Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	16,985	10,911
End of Period Nonaccrual	15,239	16,985
Nonaccrual With No Related Allowance	5,707	6,436
Past Due 90+ Days Still Accruing		0
Interest Income Recognized on Nonaccrual	74	101
Commercial | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	384	737
End of Period Nonaccrual	2,471	384
Nonaccrual With No Related Allowance	2,020	285
Past Due 90+ Days Still Accruing		0
Interest Income Recognized on Nonaccrual	(28)	0
Commercial | Business banking
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	17,122	9,863
End of Period Nonaccrual	9,641	17,122
Nonaccrual With No Related Allowance	1,696	3,890
Past Due 90+ Days Still Accruing		371
Interest Income Recognized on Nonaccrual	427	275
Consumer | Consumer real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	11,117	6,063
End of Period Nonaccrual	7,294	11,117
Nonaccrual With No Related Allowance	0	398
Past Due 90+ Days Still Accruing		132
Interest Income Recognized on Nonaccrual	496	423
Consumer | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	96	1,127
End of Period Nonaccrual	158	96
Nonaccrual With No Related Allowance	0	0
Past Due 90+ Days Still Accruing		0
Interest Income Recognized on Nonaccrual	$ 1	$ 4

Allowance for Credit Losses - C

Allowance for Credit Losses - Collateral Dependent Loans by Class of Loan (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	$ 6,999,990	$ 7,225,860
Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	34,456	108,525
Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	6,541	16,699
Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	10,473	689
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	2,690,528	2,791,947
Commercial | Commercial real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	28,046	100,450
Commercial | Commercial real estate | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Commercial real estate | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Commercial real estate | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,513,523	1,559,552
Commercial | Commercial and industrial | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	259	1,040
Commercial | Commercial and industrial | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	4,905	15,080
Commercial | Commercial and industrial | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Commercial and industrial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	10,473	0
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	424,755	466,077
Commercial | Commercial construction | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	4,210	3,552
Commercial | Commercial construction | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Commercial construction | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Commercial construction | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,135,693	1,160,067
Commercial | Business banking | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	910	3,085
Commercial | Business banking | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,636	1,619
Commercial | Business banking | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Commercial | Business banking | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	689
Consumer | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,127,585	1,167,332
Consumer | Consumer real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,031	398
Consumer | Consumer real estate | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Consumer | Consumer real estate | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	0
Consumer | Consumer real estate | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	$ 0	$ 0

Allowance for Credit Losses -_4

Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		$ 117,612	$ 62,224
Provision for credit losses on loans		15,494	131,421
Charge-offs		(37,524)	(106,365)
Recoveries		2,994	2,986
Net (Charge-offs)/Recoveries		(34,530)	(103,379)
Balance at End of Period		98,576	117,612
Customer fraud, check kiting
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge-offs	$ (58,700)
Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		65,656	30,577
Provision for credit losses on loans		(2,569)	56,489
Charge-offs		(13,444)	(26,460)
Recoveries		1,057	240
Net (Charge-offs)/Recoveries		(12,387)	(26,220)
Balance at End of Period		50,700	65,656
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		16,100	15,681
Provision for credit losses on loans		23,746	65,288
Charge-offs		(20,923)	(74,282)
Recoveries		804	1,560
Net (Charge-offs)/Recoveries		(20,119)	(72,722)
Balance at End of Period		19,727	16,100
Commercial | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		7,239	7,900
Provision for credit losses on loans		(1,842)	2,986
Charge-offs		(56)	(454)
Recoveries		14	183
Net (Charge-offs)/Recoveries		(42)	(271)
Balance at End of Period		5,355	7,239
Commercial | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		15,917	0
Provision for credit losses on loans		(3,159)	5,303
Charge-offs		(1,580)	(2,612)
Recoveries		160	328
Net (Charge-offs)/Recoveries		(1,420)	(2,284)
Balance at End of Period		11,338	15,917
Consumer | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		10,014	6,337
Provision for credit losses on loans		(1,020)	(368)
Charge-offs		(569)	(667)
Recoveries		308	187
Net (Charge-offs)/Recoveries		(261)	(480)
Balance at End of Period		8,733	10,014
Consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		2,686	1,729
Provision for credit losses on loans		338	1,723
Charge-offs		(952)	(1,890)
Recoveries		651	488
Net (Charge-offs)/Recoveries		(301)	(1,402)
Balance at End of Period		$ 2,723	2,686
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			27,346
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			4,810
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			7,853
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			(3,376)
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			12,898
Cumulative Effect, Period of Adoption, Adjustment | Consumer | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			4,525
Cumulative Effect, Period of Adoption, Adjustment | Consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 636

Allowance for Credit Losses - N

Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Credit loss, expense (reversal), period increase (decrease)	$ 115,900
Provision for credit losses on loans	15,494	$ 131,421
CARES Act, Paycheck Protection Program Loans | COVID-19
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, after allowance for credit loss		$ 465,000
CARES Act, Paycheck Protection Program Loans | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, after allowance for credit loss	$ 88,300

Right-Of-Use Assets and Lease_3

Right-Of-Use Assets and Lease Liabilities - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)directorlease	Dec. 31, 2020USD ($)lease	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Number of lease contracts | lease	48
Number of operating lease agreements | lease	45
Number of financing leases | lease	3
Operating lease expense	$ 5,135	$ 5,711	$ 4,221
Number of new leases | lease	1
Increase (decrease) in operating lease liability	$ 3,000
Increase (decrease) in operating lease liability, right of use assets	3,000
Number of operating leases considered abandoned | lease		2
Reduction (increase) of right-of-use asset value		$ 500
Right-of-use asset value after reduction		0
Reduction of operating lease liability		200
Expense recognized from lease abandonment	$ 300
Related party, lease with S&T Director
Lessee, Lease, Description [Line Items]
Number of directors | director	1
Operating lease expense	$ 200	$ 200	$ 200

Right-Of-Use Assets and Lease_4

Right-Of-Use Assets and Lease Liabilities - Operating Leases and Finance Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease expense	$ 5,135	$ 5,711	$ 4,221
Amortization of ROU assets - finance lease	224	224	101
Interest on lease liabilities - finance leases	74	84	74
Total Lease Expense	5,433	6,019	$ 4,396
Operating Leases
ROU assets	44,067	46,245
Operating cash flows	6,570	6,489
Finance Leases
ROU assets	1,055	1,278
Operating cash flows	74	84
Financing cash flows	$ 194	$ 180
Weighted Average Lease Term - Years
Operating leases	18 years 10 months 24 days	18 years 8 months 12 days
Finance leases	12 years 4 months 24 days	12 years 1 month 6 days
Weighted Average Discount Rate
Operating leases	5.82%	5.90%
Finance leases	5.91%	5.81%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Premises and equipment, net	Premises and equipment, net

Right-Of-Use Assets and Lease_5

Right-Of-Use Assets and Lease Liabilities - Maturity Analysis of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finance
2022	$ 225
2023	129
2024	130
2025	132
2026	133
Thereafter	1,012
Total	1,761
Less: Present value discount	$ (561)
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities
Lease Liabilities	$ 1,200
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Premises and equipment, net	Premises and equipment, net
Operating
2022	$ 4,707
2023	4,519
2024	4,512
2025	4,544
2026	4,574
Thereafter	64,040
Total	86,896
Less: Present value discount	(36,830)
Lease Liabilities	50,066
Total
2022	4,932
2023	4,648
2024	4,642
2025	4,676
2026	4,707
Thereafter	65,052
Total	88,657
Less: Present value discount	(37,391)
Lease Liabilities	$ 51,266

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 129,968	$ 127,083
Accumulated depreciation	(77,336)	(71,469)
Total	52,632	55,614
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	8,651	8,651
Premises
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	62,313	61,299
Furniture and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	46,799	45,072
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 12,205	$ 12,061

Premises and Equipment - Narrat

Premises and Equipment - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)right_of_use_asset	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Property, Plant and Equipment [Line Items]
Financing leases, ROU assets	$ 1,055	$ 1,278
Depreciation expense	$ 6,600	$ 6,700	$ 5,400
Land
Property, Plant and Equipment [Line Items]
Number of right of use assets | right_of_use_asset	1
Financing leases, ROU assets	$ 100
Buildings
Property, Plant and Equipment [Line Items]
Number of right of use assets | right_of_use_asset	2
Financing leases, ROU assets	$ 1,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Roll Forward of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Balance at beginning of year	$ 373,424	$ 371,621
Additions	0	1,803
Balance at End of Year	$ 373,424	$ 373,424

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 30, 2020	Nov. 30, 2019
Goodwill [Line Items]
Goodwill acquired	$ 0	$ 1,803
Amortization expense on finite-lived intangible assets	1,800	2,500	$ 800
DNB
Goodwill [Line Items]
Goodwill acquired		1,800
Identifiable Intangible Assets	$ 6,900
DNB | Wealth management
Goodwill [Line Items]
Identifiable Intangible Assets		$ 300		$ 1,772	$ 1,772

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount at beginning of year	$ 31,340	$ 31,052
Additions	0	288
Accumulated amortization	(24,445)	(22,665)
Other intangible assets, net	$ 6,895	$ 8,675

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Summary of Expected Amortization Expense for Finite-Lived Intangibles Assets (Details) $ in Thousands	Dec. 31, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2022	$ 1,518
2023	1,319
2024	1,151
2025	820
2026	671
Thereafter	1,416
Total	$ 6,895

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Assets
Derivatives (included in Other Assets)
Fair value	$ 33,528	$ 78,319
Other Assets | Interest Rate Swap Contracts—Commercial Loans
Derivatives (included in Other Assets)
Fair value	33,528	78,319
Notional amount	1,017,178	983,638
Collateral posted	0	0
Other Assets | Interest Rate Lock Commitments—Mortgage Loans
Derivatives (included in Other Assets)
Fair value	401	2,900
Notional amount	12,148	51,053
Other Assets | Forward Sale Contracts—Mortgage Loans
Derivatives (included in Other Assets)
Fair value	4	0
Notional amount	8,436	0
Other Liabilities
Derivatives (included in Other Liabilities)
Fair value	33,631	79,033
Other Liabilities | Interest Rate Swap Contracts—Commercial Loans
Derivatives (included in Other Liabilities)
Fair value	33,631	79,033
Notional amount	1,017,178	983,638
Collateral posted	37,360	77,930
Other Liabilities | Interest Rate Lock Commitments—Mortgage Loans
Derivatives (included in Other Liabilities)
Fair value	0	0
Notional amount	0	0
Other Liabilities | Forward Sale Contracts—Mortgage Loans
Derivatives (included in Other Liabilities)
Fair value	0	385
Notional amount	$ 0	$ 47,062

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Assets
Derivatives (included in Other Assets)
Gross amounts recognized	$ 37,289	$ 82,655
Gross amounts offset	(3,761)	(4,336)
Net amounts presented in the Consolidated Balance Sheets	33,528	78,319
Gross amounts not offset	0	0
Net Amount	33,528	78,319
Other Liabilities
Derivatives (included in Other Liabilities)
Gross amounts recognized	37,392	82,626
Gross amounts offset	(3,761)	(3,593)
Net amounts presented in the Consolidated Balance Sheets	33,631	79,033
Gross amounts not offset	(37,360)	(77,930)
Net Amount	$ (3,729)	$ 1,103

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss)/Gain	$ (1,500)	$ 1,447	$ (116)
Interest Rate Swap Contracts—Commercial Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss)/Gain	610	(746)	(132)
Interest Rate Lock Commitments—Mortgage Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss)/Gain	(2,499)	1,715	70
Forward Sale Contracts—Mortgage Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative (Loss)/Gain	$ 389	$ 478	$ (54)

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Mortgage Loan Activity [Line Items]
Sale of 1-4 family mortgage loans	$ 311,479	$ 357,613	$ 109,082
Total servicing portfolio	841,700	718,200	509,200
Fannie Mae
Mortgage Loan Activity [Line Items]
Sale of 1-4 family mortgage loans	$ 287,900	$ 345,100	$ 94,500

Mortgage Servicing Rights - Net

Mortgage Servicing Rights - Net Carrying Values (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Servicing Rights
Beginning Balance	$ 6,620	$ 4,939
Additions	2,974	2,887
Amortization	(1,707)	(1,206)
Ending Balance	7,887	6,620
Valuation Allowance
Beginning Balance	(1,631)	(277)
Temporary recapture (impairment)	1,421	(1,354)
Ending Balance	(210)	(1,631)
Net Carrying Value
Beginning balance	4,989	4,662
Additions	2,974	2,887
Amortization	(1,707)	(1,206)
Temporary recapture (impairment)	1,421	(1,354)
Ending balance	$ 7,677	$ 4,989

Qualified Affordable Housing (D

Qualified Affordable Housing (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)housing_project	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in qualified affordable housing projects	$ 12.6	$ 8.4
Tax credits to offset amortization expense of investments in affordable housing projects	2	2.2	$ 4.2
New Qualified Affordable Housing Project
Schedule of Equity Method Investments [Line Items]
Investments in qualified affordable housing projects	$ 19.4
Number of qualified affordable housing projects | housing_project	2
Funds invested, amount	$ 2.3
Noninterest Expense
Schedule of Equity Method Investments [Line Items]
Amortization expense of investments in qualified affordable housing projects	$ 1.2	$ 3.2	$ 2.6

Deposits - Composition of Depos

Deposits - Composition of Deposits and Interest Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Time Deposits [Line Items]
Balance	$ 7,996,524	$ 7,420,538	$ 7,036,576
Interest Expense	10,757	35,986	63,026
Noninterest-bearing demand
Time Deposits [Line Items]
Balance	2,748,586	2,261,994	1,698,082
Interest Expense	0	0	0
Interest-bearing demand
Time Deposits [Line Items]
Balance	979,133	864,510	962,331
Interest Expense	809	2,681	3,915
Money market
Time Deposits [Line Items]
Balance	2,070,579	1,937,063	1,949,811
Interest Expense	3,651	11,645	30,236
Savings
Time Deposits [Line Items]
Balance	1,110,155	969,508	830,919
Interest Expense	366	972	1,928
Certificates of deposit
Time Deposits [Line Items]
Balance	1,088,071	1,387,463	1,595,433
Interest Expense	$ 5,930	$ 20,688	$ 26,947

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deposits, by Component, Alternative [Abstract]
Certificates of deposits over $250,000, including brokered CDs	$ 243.4	$ 329.7

Deposits - Scheduled Maturities

Deposits - Scheduled Maturities of Certificates of Deposit (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposits, by Component, Alternative [Abstract]
2022	$ 961,578
2023	40,622
2024	21,712
2025	44,345
2026	16,475
Thereafter	3,339
Total	$ 1,088,071	$ 1,387,463

Short-Term Borrowings - Narrati

Short-Term Borrowings - Narrative (Details) - Mortgage Backed Securities - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Amortized cost of securities pledged as collateral	$ 86.3	$ 65.1
Carrying value of securities pledged as collateral	$ 88.4	$ 68.4

Short-Term Borrowings - Balance

Short-Term Borrowings - Balance, Weighted Average and Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Balance	$ 84,491	$ 140,163	$ 301,207
Weighted Average Interest Rate	0.10%	0.22%	1.76%
Interest Expense	$ 91	$ 1,603	$ 6,526
REPOs
Short-term Debt [Line Items]
Balance	$ 84,491	$ 65,163	$ 19,888
Weighted Average Interest Rate	0.10%	0.25%	0.74%
Interest Expense	$ 79	$ 169	$ 110
FHLB advances
Short-term Debt [Line Items]
Balance	$ 0	$ 75,000	$ 281,319
Weighted Average Interest Rate	0.00%	0.19%	1.84%
Interest Expense	$ 12	$ 1,434	$ 6,416

Long-Term Borrowings and Subo_3

Long-Term Borrowings and Subordinated Debt - Narrative (Details)	Dec. 31, 2021USD ($)private_placement	Dec. 31, 2020USD ($)
Debt Disclosure [Abstract]
Long-term borrowings at FHLB	$ 22,400,000	$ 23,700,000
Loans pledged as collateral at FHLB	4,000,000,000
Maximum eligible borrowing based on qualifying collateral at FHLB	2,500,000,000
Maximum borrowing capacity at FHLB	$ 2,800,000,000
Number of completed private placements of trust preferred securities | private_placement	3
Percentage of equity owned	100.00%

Long-Term Borrowings and Subo_4

Long-Term Borrowings and Subordinated Debt - Interest Expense and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Long-term borrowings	$ 22,430	$ 23,681	$ 50,868
Weighted average interest rate	1.94%	2.03%	2.60%
Interest expense	$ 458	$ 1,201	$ 1,831

Long-Term Borrowings and Subo_5

Long-Term Borrowings and Subordinated Debt - Scheduled Annual Maturities and Average Interest Rates (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance
2022	$ 7,689
2023	464
2024	13,381
2025	81
2026	87
Thereafter	728
Total	$ 22,430	$ 23,681	$ 50,868
Average  Rate
2022	2.29%
2023	5.74%
2024	1.34%
2025	5.98%
2026	6.00%
Thereafter	6.01%
Total	1.94%

Long-Term Borrowings and Subo_6

Long-Term Borrowings and Subordinated Debt - Junior Subordinated Debt Securities and Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Junior Subordinated Debentures [Line Items]
Junior subordinated debt securities	$ 54,393	$ 64,083	$ 64,277
Interest Expense	1,843	2,286	2,310
Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Junior subordinated debt securities	25,000	34,750	34,753
Interest Expense	756	1,007	1,059
Junior subordinated debt—trust preferred securities
Junior Subordinated Debentures [Line Items]
Junior subordinated debt securities	29,393	29,333	29,524
Interest Expense	$ 1,087	$ 1,279	$ 1,251

Long-Term Borrowings and Subo_7

Long-Term Borrowings and Subordinated Debt - Key Terms of Junior Subordinated Debt Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Junior Subordinated Debentures [Line Items]
Long-term borrowings	$ 54,393	$ 64,083	$ 64,277
Interest Rate at December 31, 2021	1.94%	2.03%	2.60%
Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Long-term borrowings	$ 25,000	$ 34,750	$ 34,753
Trust Preferred Securities
Junior Subordinated Debentures [Line Items]
Long-term borrowings	29,393	$ 29,333	$ 29,524
2001 Trust Preferred Securities | Trust Preferred Securities
Junior Subordinated Debentures [Line Items]
Long-term borrowings	$ 5,155
Regulatory Capital	Tier 1
Interest Rate at December 31, 2021	3.90%
2001 Trust Preferred Securities | Trust Preferred Securities | LIBOR
Junior Subordinated Debentures [Line Items]
Interest Rate	3.75%
2005 Trust Preferred Securities | Trust Preferred Securities
Junior Subordinated Debentures [Line Items]
Long-term borrowings	$ 4,124
Regulatory Capital	Tier 1
Interest Rate at December 31, 2021	1.93%
2005 Trust Preferred Securities | Trust Preferred Securities | LIBOR
Junior Subordinated Debentures [Line Items]
Interest Rate	1.77%
2006 Junior Subordinated Debt | Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Long-term borrowings	$ 25,000
Regulatory Capital	Tier 2
Interest Rate at December 31, 2021	1.80%
2006 Junior Subordinated Debt | Junior Subordinated Debt | LIBOR
Junior Subordinated Debentures [Line Items]
Interest Rate	1.60%
2008 Trust Preferred Securities | Trust Preferred Securities
Junior Subordinated Debentures [Line Items]
Long-term borrowings	$ 20,619
Regulatory Capital	Tier 1
Interest Rate at December 31, 2021	3.70%
2008 Trust Preferred Securities | Trust Preferred Securities | LIBOR
Junior Subordinated Debentures [Line Items]
Interest Rate	3.50%

Commitments and Contingencies -

Commitments and Contingencies - Commitments and Letters of Credit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Commitment And Contingencies [Line Items]
Total Commitments	$ 2,671,292	$ 2,274,847
Standby letters of credit
Commitment And Contingencies [Line Items]
Total Commitments	87,335	89,095
Commitments to extend credit
Commitment And Contingencies [Line Items]
Total Commitments	$ 2,583,957	$ 2,185,752

Commitments and Contingencies_2

Commitments and Contingencies - Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 4,467	$ 3,112
Impact of adopting ASU 2016-13 at January 1, 2020	5,189	4,467
Provision for credit losses	722	6
Balance at end of period	5,189	4,467
Cumulative Effect, Period of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	0	1,349
Impact of adopting ASU 2016-13 at January 1, 2020		0
Balance at end of period		0
Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 4,467	4,461
Impact of adopting ASU 2016-13 at January 1, 2020		4,467
Balance at end of period		$ 4,467

Commitments and Contingencies_3

Commitments and Contingencies - Significant Fixed and Determinable Contractual Obligation (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deposits Without A Stated Maturity
2022	$ 6,908,453
2023-2024	0
2025-2026	0
Later Years	0
Total	6,908,453
Certificates of Deposit
2022	961,578
2023-2024	62,334
2025-2026	60,820
Later Years	3,339
Total	1,088,071	$ 1,387,463
Securities Sold Under Repurchase Agreements
2022	84,491
2023-2024	0
2025-2026	0
Later Years	0
Total	84,491
Short-term Borrowings
2022	0
2023-2024	0
2025-2026	0
Later Years	0
Total	0	75,000
Long-term Borrowings
2022	7,689
2023-2024	13,845
2025-2026	168
Later Years	728
Total	22,430	$ 23,681	$ 50,868
Junior Subordinated Debt Securities
2022	0
2023-2024	0
2025-2026	0
Later Years	54,393
Total	54,393
Operating and Capital Leases
2022	4,932
2023-2024	9,290
2025-2026	9,383
Later Years	65,052
Total	88,657
Purchase Obligation
2022	19,823
2023-2024	42,432
2025-2026	46,492
Later Years	0
Total	108,747
Contractual Obligation, Fiscal Year Maturity [Abstract]
2022	7,986,966
2023-2024	127,901
2025-2026	116,863
Later Years	123,512
Total	$ 8,355,242

Revenue From Contracts With C_3

Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 15,040	$ 13,597	$ 13,316
Service charges on deposit accounts | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,880	1,797	1,859
Service charges on deposit accounts | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	13,160	11,800	11,457
Debit and credit card
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17,952	15,093	13,405
Debit and credit card | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	919	738	723
Debit and credit card | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	17,033	14,355	12,682
Wealth management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	12,889	9,957	8,623
Wealth management | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,187	7,919	6,939
Wealth management | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,702	2,038	1,684
Other fee revenue | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,900	$ 1,810	$ 3,836

Income Taxes - Income Tax Expen

Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal
Current	$ 22,581	$ 4,256	$ 18,918
Deferred	2,273	(4,273)	(406)
Total Federal	24,854	(17)	18,512
State
Current	361	145	589
Deferred	110	(129)	25
Total State	471	16	614
Total Federal and State	$ 25,325	$ (1)	$ 19,126

Income Taxes - Statutory to Eff

Income Taxes - Statutory to Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	21.00%	21.00%
Low income housing tax credits	(1.50%)	(11.10%)	(3.30%)
Tax-exempt interest	(1.30%)	(11.90%)	(2.10%)
Bank owned life insurance	(0.30%)	(1.80%)	(0.40%)
Merger related expenses	0.00%	0.00%	0.30%
Other	0.80%	3.80%	0.80%
Effective Tax Rate	18.70%	0.00%	16.30%

Income Taxes - Significant Comp

Income Taxes - Significant Components of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets:
Allowance for credit losses	$ 22,083	$ 26,051
Lease liabilities	10,876	11,368
State net operating loss carryforwards	5,565	5,489
Net adjustment to funded status of pension	3,922	4,692
Low income housing partnerships	3,270	3,996
Other employee benefits	3,433	2,050
Other	3,973	3,798
Gross Deferred Tax Assets	53,122	57,444
Less: Valuation allowance	(5,565)	(5,489)
Total Deferred Tax Assets	47,557	51,955
Deferred Tax Liabilities:
Right-of-use lease assets	(9,603)	(10,141)
Net unrealized gains on securities available-for-sale	(2,004)	(7,125)
Deferred loan income	(6,697)	(6,796)
Prepaid pension	(4,566)	(5,209)
Purchase accounting adjustments	(1,954)	(1,971)
Depreciation on premises and equipment	(1,107)	(1,275)
Other	(1,466)	(1,245)
Total Deferred Tax liabilities	(27,397)	(33,762)
Net Deferred Tax Asset	$ 20,160	$ 18,193

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Income Taxes [Line Items]
Valuation allowance related to gross deferred tax assets	$ 5,565	$ 5,489
Deferred tax assets, net operating loss carry forwards	55,700
Tax assessment from 2016 to 2018	100
PENNSYLVANIA
Schedule Of Income Taxes [Line Items]
Valuation allowance related to gross deferred tax assets	$ 5,500	$ 5,500

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Change in Federal and State Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 1,277	$ 1,051	$ 768
Prior period tax positions	0
Prior period tax positions		(18)	(10)
Current period tax positions	54	244	293
Balance at End of Year	1,331	1,277	1,051
Amount That Would Impact the Effective Tax Rate if Recognized	$ 1,069	$ 1,027	$ 848

Tax Effects on Other Comprehe_3

Tax Effects on Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pre-Tax Amount
Other Comprehensive Loss	$ (20,411)	$ 26,232	$ 14,537
Tax Benefit (Expense)
Other Comprehensive Income	4,350	(5,591)	(3,100)
Net of Tax Amount
Other comprehensive income (loss)	(16,061)	20,641	11,437
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Net change in unrealized gains on debt securities available-for sale	(23,972)	22,683	15,793
Net available-for-sale securities (gains) losses reclassified into earnings	0	0	26
Tax Benefit (Expense)
Net change in unrealized gains on debt securities available-for sale	5,115	(4,827)	(3,367)
Net available-for-sale securities (gains) losses reclassified into earnings	0	0	(6)
Net of Tax Amount
Net change in unrealized gains on debt securities available-for sale	(18,857)	17,856	12,426
Net available-for-sale securities (gains) losses reclassified into earnings	0	0	20
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other Comprehensive Loss	3,561	3,549	(1,282)
Tax Benefit (Expense)
Other Comprehensive Income	(765)	(764)	273
Net of Tax Amount
Other comprehensive income (loss)	$ 2,796	$ 2,785	$ (1,009)

Employee Benefits - Narrative (

Employee Benefits - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Number of consecutive years of employee's compensation	5 years
Number of total years of employee's compensation	10 years
Service cost	$ 0
Expected long-term rate of return on plan assets	2.42%	3.45%	4.80%
Accumulated benefit obligation	$ 104,100,000	$ 117,500,000
Projected benefit obligation	104,097,000	117,506,000	$ 113,679,000
Net periodic benefit cost	2,953,000	1,783,000	867,000
Amounts before tax reflected in accumulated other comprehensive income (loss)	18,029,000	19,572,000
Settlement charge	1,629,000	833,000	0
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	2,300,000	5,600,000
Net periodic benefit cost	600,000	700,000	400,000
Amounts before tax reflected in accumulated other comprehensive income (loss)	400,000	2,400,000
Settlement charge	$ 300,000
Thrift Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions to the Thrift Plan	3.50%
Compensation expense	$ 2,400,000	$ 2,400,000	$ 2,000,000
Equities and alternatives | Minimum
Defined Benefit Plan Disclosure [Line Items]
Targeted asset allocation percentage	5.00%
Equities and alternatives | Maximum
Defined Benefit Plan Disclosure [Line Items]
Targeted asset allocation percentage	15.00%
Fixed income | Minimum
Defined Benefit Plan Disclosure [Line Items]
Targeted asset allocation percentage	85.00%
Fixed income | Maximum
Defined Benefit Plan Disclosure [Line Items]
Targeted asset allocation percentage	95.00%

Employee Benefits - Benefit Obl

Employee Benefits - Benefit Obligation and Plan Assets Deriving Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	$ 117,506	$ 113,679
Interest cost	2,950	3,456	$ 3,987
Actuarial gain/(loss)	(2,136)	10,525
Benefits paid	(14,223)	(10,154)
Projected Benefit Obligation at End of Year	104,097	117,506	113,679
Change in Plan Assets
Fair value of plan assets at beginning of year	122,344	116,652
Actual return on plan assets	(596)	15,731
Employer contributions	0	115
Benefits paid	(14,223)	(10,154)
Fair Value of Plan Assets at End of Year	107,525	122,344	$ 116,652
Funded Status	$ 3,428	$ 4,838

Employee Benefits - Accumulated

Employee Benefits - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Net actuarial loss	$ (18,029)	$ (19,572)
Total (Before Tax Effects)	$ (18,029)	$ (19,572)

Employee Benefits - Actuarial W

Employee Benefits - Actuarial Weighted Average Assumptions Used in Determining Benefit Obligation (Details)	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Discount rate	2.80%	2.48%
Rate of compensation increase	0.00%	0.00%

Employee Benefits - Components

Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of Net Periodic Pension Cost
Interest cost on projected benefit obligation	$ 2,950	$ 3,456	$ 3,987
Expected return on plan assets	(2,677)	(3,925)	(4,731)
Amortization of prior service credit - DNB merger	0	0	7
Recognized net actuarial loss	1,051	1,419	1,604
Settlement charge	1,629	833	0
Net Periodic Pension Expense	2,953	1,783	867
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss)
Net actuarial loss/(gain)	1,137	(1,282)	2,370
Recognized net actuarial loss	(1,051)	(1,419)	(1,604)
Settlement loss recognized	(1,629)	(833)	0
Recognized prior service credit	0	0	0
Total (Before Tax Effects)	(1,543)	(3,534)	766
Total Recognized in Net Benefit Cost and Other Comprehensive Income/(Loss) (Before Tax Effects)	$ 1,410	$ (1,751)	$ 1,633

Employee Benefits - Actuarial_2

Employee Benefits - Actuarial Weighted Average Assumptions Used in Determining Net Periodic Pension Cost (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Discount rate	2.48%	3.25%	4.31%
Rate of compensation increase	0.00%	0.00%	0.00%
Expected return on assets	2.42%	3.45%	4.80%

Employee Benefits - Estimated F

Employee Benefits - Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2021USD ($)
Retirement Benefits [Abstract]
2022	$ 7,088
2023	7,023
2024	6,768
2025	6,590
2026	6,361
2027 - 2031	$ 30,536

Employee Benefits - Pension Pla

Employee Benefits - Pension Plan Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	$ 107,525	$ 122,344	$ 116,652
Fair Value Measurements, Recurring
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	107,525	122,344
Fair Value Measurements, Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,759	1,563
Fair Value Measurements, Recurring | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	93,495	108,583
Fair Value Measurements, Recurring | Equity index mutual funds - international
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,043	3,332
Fair Value Measurements, Recurring | Domestic individual equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	7,228	8,866
Fair Value Measurements, Recurring | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	107,525	122,344
Fair Value Measurements, Recurring | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,759	1,563
Fair Value Measurements, Recurring | Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	93,495	108,583
Fair Value Measurements, Recurring | Level 1 | Equity index mutual funds - international
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	3,043	3,332
Fair Value Measurements, Recurring | Level 1 | Domestic individual equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	7,228	8,866
Fair Value Measurements, Recurring | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 2 | Equity index mutual funds - international
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 2 | Domestic individual equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 3 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 3 | Equity index mutual funds - international
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Fair Value Measurements, Recurring | Level 3 | Domestic individual equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	$ 0	$ 0

Incentive and Restricted Stoc_3

Incentive and Restricted Stock Plan and Dividend Reinvestment Plan - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense to be recognized	$ 3.6
Weighted average compensation expense recognize period	1 year 11 months 4 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	130,670	230,703	84,882
Compensation expense	$ 2.4	$ 0.7	$ 2.4
Tax benefit realized on compensation expense	$ 0.5	$ 0.2	$ 0.5
2021 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common stock authorized (in shares)	1,000,000
Stock plan expiration period	10 years
2021 Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	30,959
2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common stock authorized (in shares)	750,000
Stock plan expiration period	10 years
2014 Stock Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	99,711	230,703	84,882

Incentive and Restricted Stoc_4

Incentive and Restricted Stock Plan and Dividend Reinvestment Plan - Summary of Restricted Stock Awards Granted (Details) - Restricted Stock - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	130,670	230,703	84,882
2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	99,711	230,703	84,882
Directors | 2021 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	1 year
Granted (in shares)	14,650	0	0
Directors | 2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	1 year
Granted (in shares)	0	23,153	13,057
Chief Executive Officer | 2021 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	1 year
Granted (in shares)	8,309	0	0
Senior Management | 2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Granted (in shares)	78,769	123,881	71,825
Other Awards | 2021 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Granted (in shares)	8,000	0	0
Other Awards | 2014 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Granted (in shares)	20,942	83,669	0

Incentive and Restricted Stoc_5

Incentive and Restricted Stock Plan and Dividend Reinvestment Plan - Non-vested Restricted Stock Granted (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock
Non-vested at beginning of the year (in shares)	276,680	182,035
Granted (in shares)	130,670	230,703	84,882
Vested (in shares)	71,152	77,317
Forfeited (in shares)	57,810	58,741
Non-vested at end of the year (in shares)	278,388	276,680	182,035
Weighted Average Grant Date Fair Value
Non-vested at beginning of the year (in dollars per share)	$ 25.64	$ 24.54	$ 34.06
Granted (in dollars per share)	33.17	23.43
Vested (in dollars per share)	27.66	37.39
Forfeited (in dollars per share)	34.93	32.77
Non-vested at end of the year (in dollars per share)	$ 25.64	$ 24.54	$ 34.06

Parent Company Condensed Fina_3

Parent Company Condensed Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks, including interest-bearing deposits of $857,192 and $158,903 at December 31, 2021 and December 31, 2020	$ 922,215	$ 229,666
Investments in:
Other assets	226,430	304,716
Total Assets	9,488,529	8,967,897
LIABILITIES
Other liabilities	124,237	164,721
Total Liabilities	8,282,075	7,813,186
Total Shareholders’ Equity	1,206,454	1,154,711	$ 1,191,998	$ 935,761
Total Liabilities and Shareholders’ Equity	9,488,529	8,967,897
Parent Company
ASSETS
Cash and due from banks, including interest-bearing deposits of $857,192 and $158,903 at December 31, 2021 and December 31, 2020	10,769	6,585
Investments in:
Bank subsidiary	1,209,796	1,168,831
Non-bank subsidiaries	5,684	10,493
Other assets	9,993	8,614
Total Assets	1,236,242	1,194,523
LIABILITIES
Long-term debt	29,521	39,317
Other liabilities	267	495
Total Liabilities	29,788	39,812
Total Shareholders’ Equity	1,206,454	1,154,711
Total Liabilities and Shareholders’ Equity	$ 1,236,242	$ 1,194,523

Parent Company Condensed Fina_4

Parent Company Condensed Financial Information - Statements of Net Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]
Total Interest and Dividend Income	$ 289,262	$ 320,464	$ 320,484
Interest expense on long-term debt	458	1,201	1,831
Income tax benefit	25,325	(1)	19,126
Equity in undistributed net income (distribution in excess of net income) of:
Net Income	110,343	21,040	98,234
Parent Company
Condensed Income Statements, Captions [Line Items]
Dividends from subsidiaries	62,333	59,315	59,490
Investment income	0	0	1
Total Interest and Dividend Income	62,333	59,315	59,491
Interest expense on long-term debt	313	1,696	1,285
Other expenses	5,034	4,464	4,325
Total Expense	5,347	6,160	5,610
Income before income tax and undistributed net income of subsidiaries	56,986	53,155	53,881
Income tax benefit	(1,140)	(1,315)	(1,189)
Income before undistributed net income of subsidiaries	58,126	54,470	55,070
Equity in undistributed net income (distribution in excess of net income) of:
Bank subsidiary	57,025	(27,529)	42,683
Non-bank subsidiaries	(4,808)	(5,901)	481
Net Income	$ 110,343	$ 21,040	$ 98,234

Parent Company Condensed Fina_5

Parent Company Condensed Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net Income	$ 110,343	$ 21,040	$ 98,234
Net Cash Provided by Operating Activities	216,111	53,451	138,423
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities	11,980	(161,101)	(210,556)
FINANCING ACTIVITIES
Repayment of long term debt	(11,001)	(27,187)	(35,936)
Sale of treasury shares, net	(630)	(594)	(915)
Purchase of treasury shares	0	(12,559)	(18,222)
Cash dividends paid to common shareholders	(44,325)	(43,949)	(37,360)
Net Cash Provided by Financing Activities	464,458	139,493	114,467
Net increase in cash and cash equivalents	692,549	31,843	42,334
Cash and cash equivalents at beginning of year	229,666	197,823	155,489
Cash and Cash Equivalents at End of Year	922,215	229,666	197,823
Parent Company
OPERATING ACTIVITIES
Net Income	110,343	21,040	98,234
Equity in undistributed (earnings) losses of subsidiaries	(52,217)	33,430	(43,164)
Other	761	1,708	(99)
Net Cash Provided by Operating Activities	58,887	56,178	54,971
INVESTING ACTIVITIES
Net investments in subsidiaries	0	0	176
Acquisitions	0	0	(10)
Net Cash Provided by (Used in) Investing Activities	0	0	166
FINANCING ACTIVITIES
Repayment of long term debt	(9,750)	0	0
Sale of treasury shares, net	(629)	(594)	(915)
Purchase of treasury shares	0	(12,559)	(18,222)
Cash dividends paid to common shareholders	(44,324)	(43,949)	(37,360)
Payment to repurchase of warrant	0	0	0
Net Cash Provided by Financing Activities	(54,703)	(57,102)	(56,497)
Net increase in cash and cash equivalents	4,184	(924)	(1,360)
Cash and cash equivalents at beginning of year	6,585	7,509	8,869
Cash and Cash Equivalents at End of Year	$ 10,769	$ 6,585	$ 7,509

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)
Regulatory Capital Requirements Under Banking Regulations [Abstract]
Total trust preferred securities	$ 29
Junior subordinated debt, included in Tier 2 capital	$ 25

Regulatory Matters - Summary of

Regulatory Matters - Summary of Risk-Based Capital Amounts and Ratios (Details) $ in Thousands	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
S&T
Leverage Ratio, Amount
Actual	$ 889,785	$ 852,515
Minimum Regulatory Capital Requirements	365,535	350,311
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 456,918	$ 437,889
Leverage Ratio
Actual	0.0974	0.0943
Minimum Regulatory Capital Requirements	0.0400	0.0400
To be Well Capitalized Under Prompt Corrective Action Provisions	0.0500	0.0500
Common Equity Tier 1 (to Risk-Weighted Assets), Amount
Actual	$ 860,785	$ 796,515
Minimum Regulatory Capital Requirements	322,109	316,338
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 465,268	$ 456,933
Common Equity Tier 1 (to Risk-Weighted Assets), Ratio
Actual	0.1203	0.1133
Minimum Regulatory Capital Requirements	0.0450	0.0450
To be Well Capitalized Under Prompt Corrective Action Provisions	0.0650	0.0650
Tier 1 Capital (to Risk-Weighted Assets), Amount
Actual	$ 889,785	$ 825,515
Minimum Regulatory Capital Requirements	429,479	421,784
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 572,638	$ 562,379
Tier 1 Capital (to Risk-Weighted Assets), Ratio
Actual	0.1243	0.1174
Minimum Regulatory Capital Requirements	0.0600	0.0600
To be Well Capitalized Under Prompt Corrective Action Provisions	0.0800	0.0800
Total Capital (to Risk-Weighted Assets), Amount
Actual	$ 987,420	$ 944,686
Minimum Regulatory Capital Requirements	572,638	562,379
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 715,798	$ 702,974
Total Capital (to Risk-Weighted Assets), Ratio
Actual	0.1379	0.1344
Minimum Regulatory Capital Requirements	0.0800	0.0800
To be Well Capitalized Under Prompt Corrective Action Provisions	0.1000	0.1000
S&T Bank
Leverage Ratio, Amount
Actual	$ 864,127	$ 810,636
Minimum Regulatory Capital Requirements	365,544	349,739
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 456,930	$ 437,174
Leverage Ratio
Actual	0.0946	0.0927
Minimum Regulatory Capital Requirements	0.0400	0.0400
To be Well Capitalized Under Prompt Corrective Action Provisions	0.0500	0.0500
Common Equity Tier 1 (to Risk-Weighted Assets), Amount
Actual	$ 864,127	$ 810,636
Minimum Regulatory Capital Requirements	321,711	315,792
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 464,694	$ 456,144
Common Equity Tier 1 (to Risk-Weighted Assets), Ratio
Actual	0.1209	0.1155
Minimum Regulatory Capital Requirements	0.0450	0.0450
To be Well Capitalized Under Prompt Corrective Action Provisions	0.0650	0.0650
Tier 1 Capital (to Risk-Weighted Assets), Amount
Actual	$ 864,127	$ 810,636
Minimum Regulatory Capital Requirements	428,948	421,056
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 571,931	$ 561,408
Tier 1 Capital (to Risk-Weighted Assets), Ratio
Actual	0.1209	0.1155
Minimum Regulatory Capital Requirements	0.0600	0.0600
To be Well Capitalized Under Prompt Corrective Action Provisions	0.0800	0.0800
Total Capital (to Risk-Weighted Assets), Amount
Actual	$ 961,762	$ 922,007
Minimum Regulatory Capital Requirements	571,931	561,408
To be Well Capitalized Under Prompt Corrective Action Provisions	$ 714,913	$ 701,760
Total Capital (to Risk-Weighted Assets), Ratio
Actual	0.1345	0.1314
Minimum Regulatory Capital Requirements	0.0800	0.0800
To be Well Capitalized Under Prompt Corrective Action Provisions	0.1000	0.1000

Share Repurchase Plan (Details)

Share Repurchase Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 15, 2021
Equity [Abstract]
Stock repurchase program, authorized amount				$ 50
Stock repurchase program, remaining authorized repurchase amount	$ 37.4
Repurchased common shares (in shares)	0	411,430	470,708

Uncategorized Items - stba-2021

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-02 [Member]