S&T Bancorp (STBA) 10-Q 4 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 31, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
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, $2.50 par value
Trading Symbol	STBA
Security Exchange Name	NASDAQ
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		39,350,383
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000719220
Current Fiscal Year End Date	--12-31

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks, including interest-bearing deposits of $856,105 and $158,903 at September 30, 2021 and December 31, 2020	$ 934,377	$ 229,666
Securities, at fair value	870,121	773,693
Loans held for sale	4,303	18,528
Portfolio loans, net of unearned income	6,970,087	7,225,860
Allowance for credit losses on loans	(108,348)	(117,612)
Portfolio loans, net	6,861,739	7,108,248
Bank owned life insurance	83,259	82,303
Premises and equipment, net	52,727	55,614
Federal Home Loan Bank and other restricted stock, at cost	9,893	13,030
Goodwill	373,424	373,424
Other intangible assets, net	7,334	8,675
Other assets	238,877	304,716
Total Assets	9,436,054	8,967,897
Deposits:
Noninterest-bearing demand	2,652,314	2,261,994
Interest-bearing demand	971,321	864,510
Money market	2,045,320	1,937,063
Savings	1,074,896	969,508
Certificates of deposit	1,201,268	1,387,463
Total Deposits	7,945,119	7,420,538
Securities sold under repurchase agreements	72,586	65,163
Short-term borrowings	0	75,000
Long-term borrowings	22,693	23,681
Junior subordinated debt securities	64,128	64,083
Other liabilities	129,847	164,721
Total Liabilities	8,234,373	7,813,186
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—41,449,444 shares at September 30, 2021 and December 31, 2020 Outstanding—39,367,847 shares at September 30, 2021 and 39,298,007 shares at December 31, 2020	103,623	103,623
Additional paid-in capital	403,028	400,668
Retained earnings	762,374	710,061
Accumulated other comprehensive (loss) income	(1,029)	8,971
Treasury stock — 2,081,597 shares at September 30, 2021 and 2,151,437 shares at December 31, 2020, at cost	(66,315)	(68,612)
Total Shareholders’ Equity	1,201,681	1,154,711
Total Liabilities and Shareholders’ Equity	$ 9,436,054	$ 8,967,897

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks, interest-bearing amounts	$ 856,105	$ 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)	39,367,847	39,298,007
Treasury stock, shares (in shares)	2,081,597	2,151,437

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 66,914	$ 72,263	$ 204,088	$ 229,812
Investment Securities:
Taxable	4,176	3,473	11,532	11,547
Tax-exempt	595	885	2,098	2,646
Dividends	84	227	409	911
Total Interest and Dividend Income	71,769	76,848	218,127	244,916
INTEREST EXPENSE
Deposits	2,439	6,626	8,572	31,191
Borrowings and junior subordinated debt securities	619	946	1,881	4,265
Total Interest Expense	3,058	7,572	10,453	35,456
NET INTEREST INCOME	68,711	69,276	207,674	209,460
Provision for credit losses	(3,388)	(17,485)	(9,087)	(124,294)
Net Interest Income After Provision for Credit Losses	65,323	51,791	198,587	85,166
NONINTEREST INCOME
Net gain on sale of securities	0	0	29	142
Mortgage banking	2,162	3,964	8,206	7,823
Commercial loan swap income	184	499	577	3,928
Other	1,534	2,024	5,595	3,358
Total Noninterest Income	15,846	16,483	48,507	44,110
NONINTEREST EXPENSE
Salaries and employee benefits	25,228	24,571	73,070	67,326
Data processing and information technology	4,001	4,218	12,012	11,671
Occupancy	3,660	3,441	10,921	10,643
Furniture, equipment and software	2,745	2,440	7,787	7,965
Other taxes	1,830	1,612	5,098	4,816
Professional services and legal	1,550	1,911	4,718	4,890
Marketing	890	1,793	3,208	3,883
FDIC insurance	1,210	1,900	3,180	3,718
Merger related expenses	0	0	0	2,342
Other	6,127	6,360	18,656	20,861
Total Noninterest Expense	47,241	48,246	138,650	138,115
Income (Loss) Before Taxes	33,928	20,028	108,444	(8,839)
Income tax expense (benefit)	6,330	3,323	20,578	(5,703)
Net Income (Loss)	$ 27,598	$ 16,705	$ 87,866	$ (3,136)
Earnings per share—basic (in dollars per share)	$ 0.71	$ 0.43	$ 2.25	$ (0.08)
Earnings per share—diluted (in dollars per share)	0.70	0.43	2.24	(0.08)
Dividends declared per share (in dollars per share)	$ 0.28	$ 0.28	$ 0.84	$ 0.84
Comprehensive Income	$ 22,964	$ 16,926	$ 77,866	$ 17,967
Debit and credit card
NONINTEREST INCOME
Revenues from contract with customers	4,579	4,171	13,486	11,264
Service charges on deposit accounts
NONINTEREST INCOME
Revenues from contract with customers	3,923	3,303	11,039	10,124
Wealth management
NONINTEREST INCOME
Revenues from contract with customers	$ 3,464	$ 2,522	$ 9,576	$ 7,471

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Impact of new accounting standard	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained EarningsImpact of new accounting standard	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2019	$ 1,191,998	$ (22,590)	$ 103,623	$ 399,944	$ 761,083	$ (22,590)	$ (11,670)	$ (60,982)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,136)				(3,136)
Other comprehensive income (loss), net of tax	21,123						21,123
Cash dividends declared	(32,972)				(32,972)
Treasury stock issued for restricted stock awards, net of forfeitures	(594)				(4,034)			3,440
Repurchase of common stock	(12,559)							(12,559)
Recognition of restricted stock compensation expense	845			845
Ending Balance at Sep. 30, 2020	$ 1,142,115		103,623	400,789	698,351		9,453	(70,101)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	ASU No. 2016-13
Beginning Balance at Dec. 31, 2019	$ 1,191,998	$ (22,590)	103,623	399,944	761,083	$ (22,590)	(11,670)	(60,982)
Ending Balance at Dec. 31, 2020	1,154,711		103,623	400,668	710,061		8,971	(68,612)
Beginning Balance at Jun. 30, 2020	1,135,777		103,623	400,417	692,240		9,232	(69,735)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	16,705				16,705
Other comprehensive income (loss), net of tax	221						221
Cash dividends declared	(10,960)				(10,960)
Forfeitures of restricted stock awards	0				366			(366)
Recognition of restricted stock compensation expense	372			372
Ending Balance at Sep. 30, 2020	$ 1,142,115		103,623	400,789	698,351		9,453	(70,101)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	ASU No. 2016-13
Beginning 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 (loss)	87,866				87,866
Other comprehensive income (loss), net of tax	(10,000)						(10,000)
Cash dividends declared	(32,954)				(32,954)
Treasury stock issued for restricted stock awards, net of forfeitures	(302)				(2,599)			2,297
Recognition of restricted stock compensation expense	2,360			2,360
Ending Balance at Sep. 30, 2021	$ 1,201,681		103,623	403,028	762,374		(1,029)	(66,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	ASU No. 2016-13
Beginning Balance at Jun. 30, 2021	$ 1,188,733		103,623	402,053	746,472		3,605	(67,020)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	27,598				27,598
Other comprehensive income (loss), net of tax	(4,634)						(4,634)
Cash dividends declared	(10,991)				(10,991)
Treasury stock issued for restricted stock awards, net of forfeitures	0				(705)			705
Recognition of restricted stock compensation expense	975			975
Ending Balance at Sep. 30, 2021	$ 1,201,681		$ 103,623	$ 403,028	$ 762,374		$ (1,029)	$ (66,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	ASU No. 2016-13

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.28	$ 0.28	$ 0.84	$ 0.84
Forfeitures of restricted stock (in shares)	25,459		55,330	44,270
Restricted stock awards, net of forfeitures (in shares)	3,331	11,822	125,170	147,034
Repurchase of common stock (in shares)				411,430

CONDENSED CONSOLIDATED STATEM_2

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

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Principles of Consolidation The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or 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. Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the Securities and Exchange Commission, or SEC, on March 1, 2021. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period. 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. Refer to Note 2, Business Combinations in our Annual Report on Form 10-K for the year ended December 31, 2020 for further details on the merger. Reclassification A mounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our results of operations or financial condition. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. 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. Amendments to certain SEC paragraphs from the Codification in response to issuance of SEC Final Rules (Topics 205 and 946) In August 2021, the FASB issued ASU No. 2021-06, which amends certain SEC paragraphs from the Codification in response to the issuance of SEC Final Rule Nos. 33-10786, Amendments to Financial Disclosures About Acquired and Disposed Businesses, and 33-10835, Update of Statistical Disclosures for Bank and Savings and Loan Registrants. We adopted this ASU in August 2021. The amendments in this ASU did not impact our consolidated financial statements. Accounting Standards Issued 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 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.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Diluted earnings per share is calculated using both the two-class and the treasury stock methods with the more dilutive method used to determine diluted earnings per share. For the three and nine months ended September 30, 2021 and 2020, diluted EPS was reported using the two-class method. The following table reconciles the numerators and denominators of basic and diluted earnings per share calculations for the periods presented. Three Months Ended September 30, Nine months ended September 30, (in thousands, except share and per share data) 2021 2020 2021 2020 Numerator for Earnings per Share—Basic: Net income (loss) $ 27,598 $ 16,705 $ 87,866 $ (3,136) Less: Income allocated to participating shares 125 52 408 — Net Income Allocated to Shareholders $ 27,473 $ 16,653 $ 87,458 $ (3,136) Numerator for Earnings per Share—Diluted: Net income (loss) $ 27,598 $ 16,705 $ 87,866 $ (3,136) Net Income Available to Shareholders $ 27,598 $ 16,705 $ 87,866 $ (3,136) Denominators for Earnings per Share: Weighted Average Shares Outstanding—Basic 39,060,616 39,020,811 39,044,412 39,101,309 Add: Potentially dilutive shares 86,157 20,656 89,194 — Denominator for Treasury Stock Method—Diluted 39,146,773 39,041,467 39,133,606 39,101,309 Weighted Average Shares Outstanding—Basic 39,060,616 39,020,811 39,044,412 39,101,309 Add: Average participating shares outstanding 1,464 — 458 — Denominator for Two-Class Method—Diluted 39,062,080 39,020,811 39,044,870 39,101,309 Earnings (loss) per share—basic $ 0.71 $ 0.43 $ 2.25 $ (0.08) Earnings (loss) per share—diluted $ 0.70 $ 0.43 $ 2.24 $ (0.08) Restricted stock considered anti-dilutive excluded from potentially dilutive shares 163 19,449 615 1,137

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
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 that 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 Available-for-Sale Debt Securities 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 that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3. 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 noninterest income in our Condensed Consolidated Statements of Comprehensive Income (Loss). 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. Accordingly, 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. 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. Nonrecurring Basis Loans Held for Sale Loans held for sale are carried at the lower of cost or market and consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans are 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 2. 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 marked 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 marked to 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 and evaluated for impairment quarterly by comparing the carrying to the fair value of the MSRs. 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. Since the valuation model includes significant unobservable inputs as listed above, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into mortgage banking income in the Condensed Consolidated Statements of Comprehensive Income (Loss). 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 a 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. 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. Assets and Liabilities Recorded at Fair Value on a 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 September 30, 2021 and December 31, 2020. September 30, 2021 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ 85,300 $ — $ — $ 85,300 Obligations of U.S. government corporations and agencies — 71,205 — 71,205 Collateralized mortgage obligations of U.S. government corporations and agencies — 208,985 — 208,985 Residential mortgage-backed securities of U.S. government corporations and agencies — 60,442 — 60,442 Commercial mortgage-backed securities of U.S. government corporations and agencies — 356,506 — 356,506 Corporate obligations — 500 — 500 Obligations of states and political subdivisions — 86,056 — 86,056 Total Available-for-sale Debt Securities 85,300 783,694 — 868,994 Marketable equity securities 1,051 76 — 1,127 Total Securities 86,351 783,770 — 870,121 Securities held in a deferred compensation plan 9,320 — — 9,320 Derivative financial assets: Interest rate swaps — 42,177 — 42,177 Interest rate lock commitments — — 812 812 Forward sale contracts — — 101 101 Total Assets $ 95,671 $ 825,947 $ 913 $ 922,531 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 42,554 $ — $ 42,554 Total Liabilities $ — $ 42,554 $ — $ 42,554 December 31, 2020 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: 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 Available-for-sale Debt Securities 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 Loans held for sale were transferred to Level 2 from Level 3 during the nine months ended September 30, 2021. 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. 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 September 30, 2021 or December 31, 2020. For Level 3 assets measured at fair value on a nonrecurring basis as of September 30, 2021 and December 31, 2020, the significant unobservable inputs used in the fair value measurements were as follows: September 30, 2021 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans individually evaluated $ 41,135 Collateral method Appraisal adjustment —% - 17.00% 13.68% Other real estate owned 13,313 Collateral method Costs to sell 4.00% - 7.00% 6.77% Mortgage servicing rights 7,015 Discounted cash flow method Discount rate 9.21% - 12.54% 9.38% Constant prepayment rates 7.93% - 14.96% 10.69% Loans held for sale 1,669 Contractual agreement None NA NA Total Assets $ 63,132 December 31, 2020 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans individually evaluated $ 67,402 Collateral method Appraisal adjustment —% - 47.00% 16.90% Other real estate owned 1,953 Collateral method Costs to sell 4.00% - 7.00% 4.92% 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 Contractual agreement None NA NA Total Assets $ 74,917 NA - not applicable (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 servicing rights discount rate and prepayment rates are based on note rate tranches and voluntary constant prepayment rates. The carrying values and fair values of our financial instruments at September 30, 2021 and December 31, 2020 are presented in the following tables: Carrying Value (1) Fair Value Measurements at September 30, 2021 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 934,377 $ 934,377 $ 934,377 $ — $ — Securities 870,121 870,121 86,351 783,770 — Loans held for sale 4,303 4,303 — 4,303 — Portfolio loans, net 6,897,715 6,784,028 — — 6,784,028 Collateral receivable 43,193 43,193 43,193 — — Securities held in a deferred compensation plan 9,320 9,320 9,320 — — Mortgage servicing rights 7,015 7,015 — — 7,015 Interest rate swaps 42,177 42,177 — 42,177 — Interest rate lock commitments 813 813 — — 813 Forward sale contracts 101 101 — — 101 LIABILITIES Deposits $ 7,945,119 $ 7,944,461 $ 6,743,851 $ 1,200,610 $ — Securities sold under repurchase agreements 72,586 72,586 72,586 — — Short-term borrowings — — — — — Long-term borrowings 22,693 23,172 4,349 18,823 — Junior subordinated debt securities 64,128 64,128 64,128 — — Interest rate swaps 42,554 42,554 — 42,554 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2020 (dollars in thousands) 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 Collateral receivable 77,936 77,936 77,936 — — Securities held in a deferred compensation plan 6,794 6,794 6,794 — — Mortgage servicing rights 4,976 4,976 — — 4,976 Interest rate swaps 78,319 78,319 — 78,319 — Interest rate lock commitments 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

Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The following table presents the fair values of our securities portfolio at the dates presented: (dollars in thousands) September 30, 2021 December 31, 2020 Available-for-sale debt securities $ 868,994 $ 770,393 Marketable equity securities 1,127 3,300 Total Securities $ 870,121 $ 773,693 Available-for-Sale Debt Securities The following tables present the amortized cost and fair value of available-for-sale debt securities as of the dates presented: September 30, 2021 December 31, 2020 (dollars in thousands) Amortized Gross Gross Fair Amortized Gross Unrealized Gains Gross Fair U.S. Treasury securities $ 85,222 $ 326 $ (248) $ 85,300 $ 9,980 $ 302 $ — $ 10,282 Obligations of U.S. government corporations and agencies 68,635 2,570 — 71,205 78,755 4,149 — 82,904 Collateralized mortgage obligations of U.S. government corporations and agencies 206,325 3,858 (1,198) 208,985 202,975 6,410 (89) 209,296 Residential mortgage-backed securities of U.S. government corporations and agencies 60,855 553 (966) 60,442 66,960 818 — 67,778 Commercial mortgage-backed securities of U.S. government corporations and agencies 347,825 9,339 (658) 356,506 258,875 14,806 — 273,681 Corporate obligations 500 — — 500 2,021 5 (1) 2,025 Obligations of states and political subdivisions 81,310 4,746 86,056 117,439 6,988 — 124,427 Total Available-for-Sale Debt Securities (1) $ 850,672 $ 21,392 $ (3,070) $ 868,994 $ 737,005 $ 33,478 $ (90) $ 770,393 (1) Excludes interest receivable of $3.2 million at September 30, 2021 and $3.1 million at December 31, 2020. Interest receivable is included in other assets in the consolidated balance sheets. The following tables present the fair value and the age of gross unrealized losses on available-for-sale debt securities by investment category as of the dates presented: September 30, 2021 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities 4 $ 43,200 $ (248) — $ — $ — 4 $ 43,200 $ (248) Obligations of U.S. government corporations and agencies — — — — — — — — — Collateralized mortgage obligations of U.S. government corporations and agencies 7 88,290 (1,198) — — — 7 88,290 (1,198) Residential mortgage-backed securities of U.S. government corporations and agencies 3 48,497 (966) — — — 3 48,497 (966) Commercial mortgage-backed securities of U.S. government corporations and agencies 7 101,479 (658) — — — 7 101,479 (658) Corporate bonds — — — — — — — — — Obligations of states and political subdivisions 1 5,000 — — — — 1 5,000 — Total 22 $ 286,466 $ (3,070) — $ — $ — 22 $ 286,466 $ (3,070) December 31, 2020 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies — — — — — — — — — 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 bonds 1 499 (1) — — — 1 499 (1) Obligations of states and political subdivisions — — — — — — — — — 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 losses or other factors. There were 22 debt securities in an unrealized loss position at September 30, 2021 and 3 debt securities in an unrealized loss position at December 31, 2020. We do not intend to sell and it is more likely than not that we will not be required to sell the securities in an unrealized loss position before recovery of their amortized cost. The unrealized losses on the debt securities were attributable to changes in interest rates and not related to the credit quality of the issuers. All debt securities were determined to be investment grade and paying principal and interest according to the contractual terms of the security. The following table presents net unrealized gains and losses, net of tax, on available-for-sale debt securities included in accumulated other comprehensive income/(loss), for the periods presented: September 30, 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 available-for-sale debt securities $ 21,392 $ (3,070) $ 18,322 $ 33,478 $ (90) $ 33,388 Income tax (expense) benefit (4,569) 657 (3,912) (7,128) 19 (7,109) Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss) $ 16,823 $ (2,413) $ 14,410 $ 26,350 $ (71) $ 26,279 The amortized cost and fair value of available-for-sale debt securities at September 30, 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. September 30, 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 $ 30,428 $ 30,760 Due after one year through five years 82,551 86,321 Due after five years through ten years 101,252 102,563 Due after ten years 20,936 22,917 Available-for-Sale Debt Securities With Fixed Maturities 235,167 242,561 Debt Securities without a single maturity date Collateralized mortgage obligations of U.S. government corporations and agencies 206,325 208,985 Residential mortgage-backed securities of U.S. government corporations and agencies 60,855 60,442 Commercial mortgage-backed securities of U.S. government corporations and agencies 347,825 356,506 Corporate Securities 500 500 Total Available-for-Sale Debt Securities $ 850,672 $ 868,994 Debt securities with carrying values of $435.0 million at September 30, 2021 and $308.3 million at December 31, 2020 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: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Marketable Equity Securities Net market gains/(losses) recognized $ 31 $ 585 $ 175 $ (552) Less: Net gains recognized for equity securities sold — — 29 142 Unrealized Gains/(Losses) on Equity Securities Still Held $ 31 $ 585 $ 146 $ (694) Total unrealized gains and losses on marketable equity securities recognized during the current period are included in other noninterest income on the Condensed Consolidated Statements of Comprehensive Income (Loss).

Loans and Loans Held for Sale

Loans and Loans Held for Sale	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
LOANS AND LOANS HELD FOR SALE	LOANS AND LOANS HELD FOR SALE Loans are presented net of unearned income of $14.5 million at September 30, 2021 and $16.0 million at December 31, 2020 and net of a discount related to purchase accounting fair value adjustments of $6.4 million at September 30, 2021 and $8.6 million at December 31, 2020. The following table presents loans as of the dates presented: (dollars in thousands) September 30, 2021 December 31, 2020 Commercial Commercial real estate $ 3,225,863 $ 3,244,974 Commercial and industrial 1,698,784 1,954,453 Commercial construction 499,317 474,280 Total Commercial Loans 5,423,964 5,673,707 Consumer Consumer real estate 1,448,517 1,471,238 Other consumer 97,606 80,915 Total Consumer Loans 1,546,123 1,552,153 Total Portfolio Loans 6,970,087 7,225,860 Loans held for sale 4,303 18,528 Total Loans (1) $ 6,974,390 $ 7,244,388 (1) Excludes interest receivable of $19.1 million at September 30, 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 $181.0 million of loans originated under the Paycheck Protection Program, or PPP, at September 30, 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 September 30, 2021, our business banking segment was $1.1 billion compared to $1.2 billion at December 31, 2020. $100.5 million of the business banking portfolio decline is due to the net change in business banking PPP loans. 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 $523.1 million of commercial real estate loans, $220.6 million of C&I loans of which $78.0 million are PPP loans, $13.4 million of commercial construction loans and $343.0 million of consumer real estate loans at September 30, 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. During the first quarter of 2021, $90.2 million of commercial loans and $23.2 million of consumer real estate loans were reclassified into the business banking segment. 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 77.8 percent of total portfolio loans at September 30, 2021 compared to 78.5 percent at December 31, 2020. Within our commercial portfolio, the CRE and commercial construction portfolios combined comprised $3.7 billion, or 68.7 percent, of total commercial loans at September 30, 2021 and $3.7 billion, or 65.6 percent, of total commercial loans at December 31, 2020 and 53.4 percent of total portfolio loans at September 30, 2021 and 51.5 percent 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 of this geography of 5.0 percent of the combined portfolios and 2.7 percent of total portfolio loans at September 30, 2021. This compares to 5.9 percent of the combined portfolios and 3.0 percent of total portfolio loans at December 31, 2020. We individually evaluate all substandard and nonaccrual 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 troubled debt restructurings, or TDRs. All TDRs will be reported as such for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is fully expected that the remaining principal and interest will be collected according to the restructured agreement. 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. The following tables summarize restructured loans as of the dates presented: September 30, 2021 December 31, 2020 (dollars in thousands) Performing Nonperforming Total Performing Nonperforming Total Commercial real estate $ 4,252 $ 11,093 $ 15,345 $ 14 $ 16,654 $ 16,668 Commercial and industrial 1,762 — 1,762 7,090 9,885 16,975 Commercial construction — — — 3,267 — 3,267 Business banking 1,647 1,492 3,139 1,503 430 1,933 Consumer real estate 6,120 1,448 7,569 5,581 2,319 7,900 Other consumer — — — 5 — 5 Total $ 13,782 $ 14,033 $ 27,815 $ 17,460 $ 29,289 $ 46,748 There was one TDR for $0.1 million that returned to accruing status during the three months ended September 30, 2021 compared to two TDRs for a total of $0.1 million that returned to accruing status for the three months ended September 30, 2020. There were six TDRs for a total of $0.5 million that returned to accruing status during the nine months ended September 30, 2021 compared to three TDRs for a total of $22.7 million for the nine months ended September 30, 2020. The following tables present the restructured loans by portfolio segment and by type of concession for the periods presented: Three Months Ended September 30, 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 — $ — $ — $ — $ — $ — $ — $ — Commercial industrial 2 — — 341 — — 341 342 Commercial construction — — — — — — — — Business banking — — — — — — — — Consumer real estate 9 317 — 31 — — 348 356 Other consumer — — — — — — — — Total 11 $ 317 $ — $ 372 $ — $ — $ 689 $ 698 (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. Three Months Ended September 30, 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 — $ — $ — $ — $ — $ — $ — $ — Commercial industrial 2 — — 3,735 — 287 4,022 4,021 Commercial construction — — — — — — — — Business banking 1 — — 171 — — 171 333 Consumer real estate 10 334 — 30 — — 364 334 Other consumer 1 4 — — — — 4 5 Total 14 $ 338 $ — $ 3,936 $ — $ 287 $ 4,561 $ 4,693 (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. Nine Months Ended September 30, 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 — $ — $ — $ — $ — $ — $ — $ — Commercial industrial 2 — — 772 — 5,196 5,968 6,304 Commercial construction — — — — — — — — Business banking 7 — 80 1,420 — — 1,500 1,551 Consumer real estate 20 866 31 147 1,045 1,064 Other consumer — — — — — — — — Total 29 $ 866 $ 80 $ 2,223 $ — $ 5,343 $ 8,513 $ 8,919 (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. Nine Months Ended September 30, 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 $ — $ — $ 2,210 $ — $ — $ 2,210 $ 2,210 Commercial industrial 3 — — 4,997 — 287 5,284 6,489 Commercial construction 3 — — 2,561 — — 2,561 2,592 Business banking 3 — — 171 — 97 268 501 Consumer real estate 23 1,052 — 206 — — 1,258 1,237 Other consumer 1 4 — — — — 4 5 Total 34 $ 1,056 $ — $ 10,145 $ — $ 384 $ 11,585 $ 13,034 (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 the 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. Under the applicable guidance, none of these loans were considered restructured as of September 30, 2021. We had 42 commercial loans that were modified totaling $58.9 million at September 30, 2021 compared to 52 commercial loans that were modified totaling $195.6 million at December 31, 2020. As of September 30, 2021, we had 12 commitments to lend an additional $0.3 million on TDRs. Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place. There were no TDRs that defaulted during the three and nine months ended September 30, 2021. There were no TDR's that defaulted during the three months ended September 30, 2020 and six TDRs that defaulted during the nine months ended September 30, 2020 for a total of $18.1 million that were restructured within the last 12 months prior to defaulting. The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) September 30, 2021 December 31, 2020 Nonperforming Assets Nonaccrual loans $ 97,279 $ 117,485 Nonaccrual TDRs 14,033 29,289 Total Nonaccrual Loans (1) 111,312 146,774 OREO 13,370 2,155 Total Nonperforming Assets $ 124,682 $ 148,929 (1) Included in nonperforming commercial loans is $1.7 million of loans held for sale.

Allowance for Credit Losses

Allowance for Credit Losses	9 Months Ended
	Sep. 30, 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) Commercial Real Estate, or CRE, 2) Commercial and Industrial, or 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. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. 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. Cash flow from the operations of the company is the primary source of repayment for these loans. 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/development 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 purpose 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, including purchase money 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. 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 presents loan balances by year of origination and internally assigned risk rating for our portfolio segments as of the dates presented: September 30, 2021 Risk Rating (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial real estate Pass $ 255,876 $ 323,514 $ 443,487 $ 341,387 $ 224,258 $ 716,460 $ 42,326 — $ 2,347,308 Special mention — 1,368 32,780 4,422 38,966 97,322 — 174,858 Substandard — 445 16,812 19,320 18,673 123,332 1,500 180,082 Doubtful — — 532 — — — — — 532 Total commercial real estate 255,876 325,327 493,611 365,129 281,897 937,114 43,826 — 2,702,780 Commercial and industrial Pass 401,200 156,589 145,923 98,137 43,019 133,945 428,398 — 1,407,211 Special mention 49 2,927 1,283 3,166 72 1,934 10,667 20,098 Substandard 5,196 — 19,180 1,374 5,258 5,532 5,017 41,557 Doubtful — — 9,332 — — — — — 9,332 Total commercial and industrial 406,445 159,516 175,718 102,677 48,349 141,411 444,082 1,478,198 Commercial construction Pass 100,774 134,440 172,508 33,903 996 4,298 21,714 — 468,633 Special mention — — — — — 4,491 — 4,491 Substandard — 2,149 7,416 — — 3,235 — 12,800 Doubtful — — — — — — — — — Total commercial construction 100,774 136,589 179,924 33,903 996 12,024 21,714 485,924 Business banking Pass 173,154 114,831 152,423 117,529 81,934 316,445 103,162 450 1,059,928 Special mention 113 153 890 1,406 935 6,265 199 121 10,082 Substandard 46 71 1,720 3,292 2,036 21,337 978 635 30,115 Doubtful — — — — — — — — — Total business banking 173,313 115,055 155,033 122,227 84,905 344,047 104,339 1,206 1,100,125 Consumer real estate Pass 89,026 107,534 94,583 58,622 42,789 242,252 435,213 23,088 1,093,107 Special mention — — — — — 2,163 — 2,163 Substandard — — 208 1,765 1,368 4,868 709 1,290 10,208 Doubtful — — — — — — — — — Total consumer real estate 89,026 107,534 94,791 60,387 44,157 249,283 435,922 24,378 1,105,478 Other consumer Pass 9,833 10,852 8,470 3,852 1,442 2,888 50,725 1,113 89,175 Special mention — — — — — — — — — Substandard — 52 105 150 368 5,930 255 1,547 8,407 Doubtful — — — — — — — — — Total other consumer 9,833 10,904 8,575 4,002 1,810 8,818 50,980 2,660 97,582 Pass 1,029,863 847,760 1,017,394 653,430 394,438 1,416,288 1,081,538 24,651 6,465,362 Special mention 162 4,448 34,953 8,994 39,973 112,175 10,866 121 211,692 Substandard 5,242 2,717 45,441 25,901 27,703 164,234 8,459 3,472 283,169 Doubtful — — 9,864 — — — — — 9,864 Total $ 1,035,267 $ 854,925 $ 1,107,652 $ 688,325 $ 462,114 $ 1,692,697 $ 1,100,863 $ 28,244 $ 6,970,087 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 Pass 1,355,292 1,136,716 792,352 502,350 494,436 1,337,222 1,011,297 25,724 6,655,389 Special Mention 5,274 47,302 19,350 24,802 57,026 91,677 24,296 124 269,851 Substandard 118 30,083 20,032 33,648 57,105 137,398 5,606 3,066 287,056 Doubtful — 645 — 4,401 1,989 6,529 — — 13,564 Total $ 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 presents loan balances by year of origination and performing and nonperforming status for our portfolio segments as of September 30, 2021 and December 31, 2020: September 30, 2021 (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial real estate Performing $ 255,876 $ 325,327 $ 477,766 $ 362,382 $ 275,458 $ 907,348 $ 43,826 $ — $ 2,647,983 Nonperforming — — 15,845 2,747 6,439 29,766 — — 54,797 Total commercial real estate 255,876 325,327 493,611 365,129 281,897 937,114 43,826 — 2,702,780 Commercial and industrial Performing 401,249 159,516 153,731 102,310 44,963 141,201 441,319 — 1,444,289 Nonperforming 5,196 21,987 367 3,386 210 2,763 — 33,909 Total commercial and industrial 406,445 159,516 175,718 102,677 48,349 141,411 444,082 1,478,198 Commercial construction Performing 100,774 136,589 176,567 33,903 996 11,328 21,714 — 481,871 Nonperforming — — 3,357 — — 696 — — 4,053 Total commercial construction 100,774 136,589 179,924 33,903 996 12,024 21,714 485,924 Business banking Performing 173,267 115,055 154,639 120,811 84,187 336,486 104,310 1,149 1,089,904 Nonperforming 46 — 394 1,416 718 7,561 29 57 10,221 Total business banking 173,313 115,055 155,033 122,227 84,905 344,047 104,339 1,206 1,100,125 Consumer real estate Performing 89,026 107,482 94,501 60,140 43,392 244,339 434,893 23,562 1,097,335 Nonperforming — 52 290 247 765 4,944 1,029 816 8,143 Total consumer real estate 89,026 107,534 94,791 60,387 44,157 249,283 435,922 24,378 1,105,478 Other consumer Performing 9,833 10,904 8,575 3,813 1,810 8,818 50,980 2,660 97,393 Nonperforming — — — 189 — — — — 189 Total other consumer 9,833 10,904 8,575 4,002 1,810 8,818 50,980 2,660 97,582 Performing 1,030,025 854,873 1,065,779 683,359 450,806 1,649,520 1,097,042 27,371 6,858,775 Nonperforming (1) 5,242 52 41,873 4,966 11,308 43,177 3,821 873 111,312 Total $ 1,035,267 $ 854,925 $ 1,107,652 $ 688,325 $ 462,114 $ 1,692,697 $ 1,100,863 $ 28,244 $ 6,970,087 (1) Included in nonperforming commercial loans is $1.7 million of loans held for sale with $0.3 million in 2010, $0.9 million in 2012 and $0.5 million in 2013. 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 $ 722,781 $ 47,830 $ — $ 2,690,877 Nonperforming — 16,404 — 6,675 20,212 57,779 — — 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 28,426 220,701 408,351 — 1,542,567 Nonperforming — 1,313 1,584 12,838 62 908 280 — 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 — 465,693 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 74,690 245,331 438,701 21,571 1,156,216 Nonperforming — 229 706 1,486 1,564 5,716 319 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 1,196,492 827,626 543,253 586,622 1,496,134 1,040,545 27,760 7,079,086 Nonperforming 30 18,254 4,108 21,948 23,934 76,692 654 1,154 146,774 Total $ 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: September 30, 2021 (dollars in thousands) Current 30-59 Days 60-89 Days Non - performing (2) Total Past Total Loans Commercial real estate $ 2,647,983 $ — $ — $ 54,797 $ 54,797 2,702,780 Commercial and industrial 1,444,289 — — 33,909 33,909 1,478,198 Commercial construction 481,871 — — 4,053 4,053 485,924 Business banking 1,088,013 970 921 10,221 12,112 1,100,125 Consumer real estate 1,095,557 833 945 8,143 9,921 1,105,478 Other consumer 97,151 219 23 189 431 97,582 Total (1) $ 6,854,864 $ 2,022 $ 1,889 $ 111,312 $ 115,223 $ 6,970,087 (1) We had 42 loans that were modified totaling $58.9 million under the CARES Act at September 30, 2021. 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 modifications, this delinquency table may not accurately reflect the credit risk associated with these loans. (2) Included in nonperforming commercial loans is $1.7 million of loans held for sale. December 31, 2020 (dollars in thousands) Current 30-59 Days 60-89 Days Past Due 90+ Days Still Accruing (2) Non - performing Total Past 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 (1) $ 7,069,730 $ 2,888 $ 5,965 $ 503 $ 146,774 $ 156,130 $ 7,225,860 (1) We had 52 loans that were modified totaling $195.6 million under the CARES Act 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. (2) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at December 31, 2020. The following table presents loans on nonaccrual status by class of loan: September 30, 2021 September 30, 2021 For the three and nine months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual (2) Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 101,070 $ 54,797 $ 47,730 $ 493 $ 556 Commercial and industrial 16,985 33,909 12,566 6 88 Commercial construction 384 4,053 3,357 — — Business banking 17,122 10,221 1,492 57 333 Consumer real estate 11,117 8,143 — 86 405 Other consumer 96 189 — — 1 Total $ 146,774 $ 111,312 $ 65,145 $ 642 $ 1,383 (1) Represents only cash payments received and applied to interest on nonaccrual loans. (2) Included in nonperforming commercial loans is $1.7 million of loans held for sale. . 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 as of the dates presented: September 30, 2021 Type of Collateral (dollars in thousands) Real Estate Business Investment/Cash Other Commercial real estate $ 51,006 $ — $ — $ — Commercial and industrial 272 13,738 — 21,730 Commercial construction 6,057 — — — Business banking 1,714 1,424 — — Consumer real estate — — — — Total $ 59,049 $ 15,162 $ — $ 21,730 December 31, 2020 Type of Collateral (dollars in thousands) Real Estate Business 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 the periods presented: Three Months Ended September 30, 2021 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 63,186 $ 14,426 $ 5,905 $ 14,756 $ 8,647 $ 2,717 $ 109,636 Provision for credit losses on loans (1) (7,856) 11,599 1,391 (2,689) (80) (63) 2,302 Charge-offs (3,661) (2) (56) (167) (76) (245) (4,207) Recoveries 1 216 2 241 33 123 616 Net (Charge-offs)/Recoveries (3,660) 214 (54) 74 (43) (122) (3,591) Balance at End of Period $ 51,670 $ 26,239 $ 7,242 $ 12,141 $ 8,524 $ 2,532 $ 108,348 (1) Excludes unfunded commitments Three Months Ended September 30, 2020 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 57,730 $ 19,164 $ 8,874 $ 14,404 $ 11,585 $ 2,852 $ 114,609 Provision for credit losses on loans (1) 23,839 (4,155) (1,617) 2,072 (797) (40) 19,302 Charge-offs (10,187) (1,196) — (1,748) (252) (284) (13,667) Recoveries 172 398 1 64 41 78 754 Net (Charge-offs)/Recoveries (10,015) (798) 1 (1,684) (211) (206) (12,913) Balance at End of Period $ 71,554 $ 14,211 $ 7,258 $ 14,792 $ 10,577 $ 2,606 $ 120,998 (1) Excludes unfunded commitments Nine Months Ended September 30, 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 (1) (2,922) 14,552 54 (2,736) (1,335) (1) 7,612 Charge-offs $ (12,030) $ (4,777) $ (56) $ (1,494) $ (422) $ (698) $ (19,477) Recoveries 966 364 5 454 267 545 2,601 Net (Charge-offs)/Recoveries (11,064) (4,413) (51) (1,040) (155) (153) (16,876) Balance at End of Period $ 51,670 $ 26,239 $ 7,242 $ 12,141 $ 8,524 $ 2,532 $ 108,348 (1) Excludes the provision for credit losses for unfunded commitments. Nine Months Ended September 30, 2020 (dollars in thousands) Commercial Commercial and 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 4,525 642 27,352 Provision for credit losses on loans (1) 52,185 62,949 2,712 4,197 32 1,489 123,564 Charge-offs (16,229) (72,692) — (2,469) (470) (1,556) (93,416) Recoveries 211 420 22 166 153 302 1,274 Net (Charge-offs)/Recoveries (16,018) (72,272) 22 (2,303) (317) (1,254) (92,142) Balance at End of Period $ 71,554 $ 14,211 $ 7,258 $ 14,792 $ 10,577 $ 2,606 $ 120,998 (1) Excludes unfunded commitments The adoption of ASU 2016-13 resulted in an increase to our ACL of $27.4 million on January 1, 2020. The increase included $8.2 million for S&T legacy loans and $9.3 million for acquired loans from the DNB merger. We also recorded a day one adjustment of $9.9 million primarily related to a C&I relationship that was charged off in the first quarter of 2020. We obtained information on the relationship subsequent to filing our December 31, 2019 Form 10-K, but before the end of the first quarter of 2020. The updated information supported a loss existed at January 1, 2020. The provision for credit losses, which includes a provision for losses on loans and on unfunded 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 $14.1 million and $115.6 million to $3.4 million and $8.7 million for the three and nine months ended September 30, 2021 compared to $17.5 million and $124.3 million for the same periods in 2020. The provision for credit losses included $1.1 million and $1.5 million for the reserve for unfunded commitments for the three and nine months ended September 30, 2021. The significant decrease in the provision for credit losses during the three and nine months ended September 30, 2021 was mainly due to the customer fraud in June of 2020 and an improved economic forecast in 2021 compared to 2020. Our economic forecast covers a period of two years and is driven primarily by national unemployment data. The forecasted national unemployment rate improved at September 30, 2021 compared to the same time in 2020.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES 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 cash 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. Our current collateral requirements do not have a material effect on our cash flow or liquidity position. 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 by our Senior Loan Committee. 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 Condensed Consolidated Statements of Comprehensive Income (Loss). 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 Condensed Consolidated Statements of Comprehensive Income (Loss). The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented: Derivatives Derivatives (dollars in thousands) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts - Commercial Loans Fair value $ 42,177 $ 78,319 $ 42,554 $ 79,033 Notional amount 998,385 983,638 998,385 983,638 Collateral posted — — 43,190 77,930 Interest Rate Lock Commitments - Mortgage Loans Fair value 812 2,900 — — Notional amount 22,674 51,053 — — Forward Sale Contracts - Mortgage Loans Fair value 101 — — 385 Notional amount $ 18,915 $ — $ — $ 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 we 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 as of the dates presented: Derivatives Derivatives (dollars in thousands) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 43,746 $ 82,655 $ 44,170 $ 82,626 Gross amounts offset (1,569) (4,336) (1,616) (3,593) Net Amounts Presented in the Consolidated Balance Sheets 42,177 78,319 42,554 79,033 Gross amounts not offset (1) — — (43,190) (77,930) Net Amount $ 42,177 $ 78,319 $ (636) $ 1,103 (1) Amounts represent collateral posted for the periods presented and included in other assets on our Consolidated Balance Sheets. The following table indicates the gain or loss recognized in income on derivatives for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ 22 $ (537) $ 337 $ (485) Interest rate lock commitments—mortgage loans 192 86 712 2,877 Forward sale contracts—mortgage loans (325) 144 (2,314) (451) Total Derivatives (Loss)/Gain $ (111) $ (307) $ (1,265) $ 1,941

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 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: (dollars in thousands) September 30, 2021 December 31, 2020 Commitments to extend credit $ 2,500,541 $ 2,185,752 Standby letters of credit 90,250 89,095 Total $ 2,590,791 $ 2,274,847 Allowance for Credit Losses on Unfunded Loan Commitments We maintain an allowance for credit losses on unfunded commercial lending commitments and letters of credit to provide for the risk of loss inherent in these arrangements. The allowance is computed using a methodology similar to that used to determine the allowance for credit losses for loans, modified to take into account the probability of a draw-down on the commitment. The provision for credit losses on unfunded loan commitments is included in the provision for credit losses on our Condensed Consolidated Statements of Comprehensive Income (Loss). The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The following table presents activity in the allowance for credit losses on unfunded loan commitments as of the dates presented: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Balance at beginning of period $ 4,858 $ 7,004 $ 4,467 $ 3,112 Impact of adopting ASU 2016-13 at January 1, 2020 — — — 1,349 Balance after adoption of ASU 2016-13 4,858 7,004 4,467 4,461 Provision for credit losses 1,085 (1,816) 1,476 727 Total $ 5,943 $ 5,188 $ 5,943 $ 5,188 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.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
OTHER COMPREHENSIVE INCOME (LOSS)	OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 (dollars in thousands) Pre-Tax Tax Net of Tax Pre-Tax Tax Benefit (Expense) Net of Tax Change in net unrealized gains/(losses) on debt securities available-for-sale $ (5,676) $ 1,211 $ (4,465) $ (882) $ 188 $ (694) Adjustment to funded status of employee benefit plans (1) (215) 46 (169) 1,163 (248) 915 Other Comprehensive Income $ (5,891) $ 1,257 $ (4,634) $ 281 $ (60) $ 221 (1) Pension settlement accounting was recognized during the periods ended September 30, 2021 resulting in a charge of $0.4 million for the three months ended September 30, 2021 immediately recognizing a portion of unrecognized actuarial loss and a remeasurement of our pension obligation. Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 (dollars in thousands) Pre-Tax Tax Net of Tax Pre-Tax Tax Net of Tax Change in net unrealized gains/(losses) on available-for-sale debt securities $ (15,065) $ 3,215 $ (11,850) $ 24,883 $ (5,294) $ 19,589 Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1) — — — (142) 30 (112) Adjustment to funded status of employee benefit plans (1) 2,351 (501) 1,850 2,092 (446) 1,646 Other Comprehensive (Loss)/Income $ (12,714) $ 2,714 $ (10,000) $ 26,833 $ (5,710) $ 21,123 (1) Pension settlement accounting was recognized during the periods ended September 30, 2021 resulting in a charge of $1.3 million for the nine months ended September 30, 2021 immediately recognizing a portion of unrecognized actuarial loss and a remeasurement of our pension obligation.

Employee Benefits

Employee Benefits	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
EMPLOYEE BENEFITS	EMPLOYEE BENEFITS Our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plans in 2016. We will continue recording pension expense related to these plans, primarily representing interest costs on the projected benefit obligation and amortization of actuarial losses accumulated in the plans, 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 investment policy for S&T's defined benefit plan is 90 percent fixed income and 10 percent equity and cash. The expected long-term rate of return on plan assets is 2.42 percent as of September 30, 2021 compared to 3.45 percent for the same period in 2020. We remeasured our pension obligation and recognized a pension settlement charge of $0.4 million and $1.3 million for the three and nine months ended September 30, 2021. A settlement charge is incurred when the aggregate amount of lump-sum distributions during the year is greater than the sum of the interest cost component of the annual net periodic pension cost. The following table summarizes the components of net periodic pension cost for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Components of Net Periodic Pension Cost Interest cost on projected benefit obligation $ 721 $ 905 $ 2,221 $ 2,686 Expected return on plan assets (668) (970) (2,029) (2,913) Net amortization 246 411 792 1,180 Settlement Charge 370 671 1,296 671 Net Periodic Pension Expense $ 669 $ 1,017 $ 2,280 $ 1,624 The components of net periodic pension expense are included in salaries and employee benefits on the Condensed Consolidated Statements of Comprehensive Income (Loss).

Share Repurchase Plan

Share Repurchase Plan	9 Months Ended
	Sep. 30, 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 September 30, 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 three and nine months ended September 30, 2021, we had no repurchases. Repurchase activity was suspended in March of 2020 due to the impact of the COVID-19 pandemic. During the year ended December 31, 2020, we repurchased 411,430 common shares at a total cost of $12.6 million, or an average of $30.52 per share.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or 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.
Basis of Presentation	Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the Securities and Exchange Commission, or SEC, on March 1, 2021. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.
Reclassification	Reclassification A mounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our results of operations or financial condition.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.
Recently Adopted Accounting Standards Updates, or ASU or Update and Accounting Standards Issued 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. Amendments to certain SEC paragraphs from the Codification in response to issuance of SEC Final Rules (Topics 205 and 946) In August 2021, the FASB issued ASU No. 2021-06, which amends certain SEC paragraphs from the Codification in response to the issuance of SEC Final Rule Nos. 33-10786, Amendments to Financial Disclosures About Acquired and Disposed Businesses, and 33-10835, Update of Statistical Disclosures for Bank and Savings and Loan Registrants. We adopted this ASU in August 2021. The amendments in this ASU did not impact our consolidated financial statements. Accounting Standards Issued 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 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.
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 that 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 Available-for-Sale Debt Securities 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 that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3. 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 noninterest income in our Condensed Consolidated Statements of Comprehensive Income (Loss). 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. Accordingly, 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. 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. Nonrecurring Basis Loans Held for Sale Loans held for sale are carried at the lower of cost or market and consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans are 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 2. 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 marked 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 marked to 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 and evaluated for impairment quarterly by comparing the carrying to the fair value of the MSRs. 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. Since the valuation model includes significant unobservable inputs as listed above, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into mortgage banking income in the Condensed Consolidated Statements of Comprehensive Income (Loss). 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 a 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. 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.
Allowance for Credit 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) Commercial Real Estate, or CRE, 2) Commercial and Industrial, or 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. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. 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. Cash flow from the operations of the company is the primary source of repayment for these loans. 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/development 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 purpose 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, including purchase money 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. 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.
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 cash 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. Our current collateral requirements do not have a material effect on our cash flow or liquidity position. 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 by our Senior Loan Committee. 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 Condensed Consolidated Statements of Comprehensive Income (Loss). 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 Condensed Consolidated Statements of Comprehensive Income (Loss).

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Reconciliation of Numerators and Denominators of Basic Earnings (Loss) Per Share with Diluted Earnings Per Share	The following table reconciles the numerators and denominators of basic and diluted earnings per share calculations for the periods presented. Three Months Ended September 30, Nine months ended September 30, (in thousands, except share and per share data) 2021 2020 2021 2020 Numerator for Earnings per Share—Basic: Net income (loss) $ 27,598 $ 16,705 $ 87,866 $ (3,136) Less: Income allocated to participating shares 125 52 408 — Net Income Allocated to Shareholders $ 27,473 $ 16,653 $ 87,458 $ (3,136) Numerator for Earnings per Share—Diluted: Net income (loss) $ 27,598 $ 16,705 $ 87,866 $ (3,136) Net Income Available to Shareholders $ 27,598 $ 16,705 $ 87,866 $ (3,136) Denominators for Earnings per Share: Weighted Average Shares Outstanding—Basic 39,060,616 39,020,811 39,044,412 39,101,309 Add: Potentially dilutive shares 86,157 20,656 89,194 — Denominator for Treasury Stock Method—Diluted 39,146,773 39,041,467 39,133,606 39,101,309 Weighted Average Shares Outstanding—Basic 39,060,616 39,020,811 39,044,412 39,101,309 Add: Average participating shares outstanding 1,464 — 458 — Denominator for Two-Class Method—Diluted 39,062,080 39,020,811 39,044,870 39,101,309 Earnings (loss) per share—basic $ 0.71 $ 0.43 $ 2.25 $ (0.08) Earnings (loss) per share—diluted $ 0.70 $ 0.43 $ 2.24 $ (0.08) Restricted stock considered anti-dilutive excluded from potentially dilutive shares 163 19,449 615 1,137

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of 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 September 30, 2021 and December 31, 2020. September 30, 2021 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ 85,300 $ — $ — $ 85,300 Obligations of U.S. government corporations and agencies — 71,205 — 71,205 Collateralized mortgage obligations of U.S. government corporations and agencies — 208,985 — 208,985 Residential mortgage-backed securities of U.S. government corporations and agencies — 60,442 — 60,442 Commercial mortgage-backed securities of U.S. government corporations and agencies — 356,506 — 356,506 Corporate obligations — 500 — 500 Obligations of states and political subdivisions — 86,056 — 86,056 Total Available-for-sale Debt Securities 85,300 783,694 — 868,994 Marketable equity securities 1,051 76 — 1,127 Total Securities 86,351 783,770 — 870,121 Securities held in a deferred compensation plan 9,320 — — 9,320 Derivative financial assets: Interest rate swaps — 42,177 — 42,177 Interest rate lock commitments — — 812 812 Forward sale contracts — — 101 101 Total Assets $ 95,671 $ 825,947 $ 913 $ 922,531 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 42,554 $ — $ 42,554 Total Liabilities $ — $ 42,554 $ — $ 42,554 December 31, 2020 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: 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 Available-for-sale Debt Securities 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
Schedule of Assets Measured at Fair Value on Nonrecurring Basis by Significant Unobservable Inputs	For Level 3 assets measured at fair value on a nonrecurring basis as of September 30, 2021 and December 31, 2020, the significant unobservable inputs used in the fair value measurements were as follows: September 30, 2021 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans individually evaluated $ 41,135 Collateral method Appraisal adjustment —% - 17.00% 13.68% Other real estate owned 13,313 Collateral method Costs to sell 4.00% - 7.00% 6.77% Mortgage servicing rights 7,015 Discounted cash flow method Discount rate 9.21% - 12.54% 9.38% Constant prepayment rates 7.93% - 14.96% 10.69% Loans held for sale 1,669 Contractual agreement None NA NA Total Assets $ 63,132 December 31, 2020 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans individually evaluated $ 67,402 Collateral method Appraisal adjustment —% - 47.00% 16.90% Other real estate owned 1,953 Collateral method Costs to sell 4.00% - 7.00% 4.92% 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 Contractual agreement None NA NA Total Assets $ 74,917 NA - not applicable (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 servicing rights discount rate and prepayment rates are based on note rate tranches and voluntary constant prepayment rates.
Schedule of Carrying Values and Fair Values of Financial Instruments	The carrying values and fair values of our financial instruments at September 30, 2021 and December 31, 2020 are presented in the following tables: Carrying Value (1) Fair Value Measurements at September 30, 2021 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 934,377 $ 934,377 $ 934,377 $ — $ — Securities 870,121 870,121 86,351 783,770 — Loans held for sale 4,303 4,303 — 4,303 — Portfolio loans, net 6,897,715 6,784,028 — — 6,784,028 Collateral receivable 43,193 43,193 43,193 — — Securities held in a deferred compensation plan 9,320 9,320 9,320 — — Mortgage servicing rights 7,015 7,015 — — 7,015 Interest rate swaps 42,177 42,177 — 42,177 — Interest rate lock commitments 813 813 — — 813 Forward sale contracts 101 101 — — 101 LIABILITIES Deposits $ 7,945,119 $ 7,944,461 $ 6,743,851 $ 1,200,610 $ — Securities sold under repurchase agreements 72,586 72,586 72,586 — — Short-term borrowings — — — — — Long-term borrowings 22,693 23,172 4,349 18,823 — Junior subordinated debt securities 64,128 64,128 64,128 — — Interest rate swaps 42,554 42,554 — 42,554 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2020 (dollars in thousands) 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 Collateral receivable 77,936 77,936 77,936 — — Securities held in a deferred compensation plan 6,794 6,794 6,794 — — Mortgage servicing rights 4,976 4,976 — — 4,976 Interest rate swaps 78,319 78,319 — 78,319 — Interest rate lock commitments 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)	9 Months Ended
	Sep. 30, 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: (dollars in thousands) September 30, 2021 December 31, 2020 Available-for-sale debt securities $ 868,994 $ 770,393 Marketable equity securities 1,127 3,300 Total Securities $ 870,121 $ 773,693
Schedule of Amortized Cost and Fair Value of Debt Securities	The following tables present the amortized cost and fair value of available-for-sale debt securities as of the dates presented: September 30, 2021 December 31, 2020 (dollars in thousands) Amortized Gross Gross Fair Amortized Gross Unrealized Gains Gross Fair U.S. Treasury securities $ 85,222 $ 326 $ (248) $ 85,300 $ 9,980 $ 302 $ — $ 10,282 Obligations of U.S. government corporations and agencies 68,635 2,570 — 71,205 78,755 4,149 — 82,904 Collateralized mortgage obligations of U.S. government corporations and agencies 206,325 3,858 (1,198) 208,985 202,975 6,410 (89) 209,296 Residential mortgage-backed securities of U.S. government corporations and agencies 60,855 553 (966) 60,442 66,960 818 — 67,778 Commercial mortgage-backed securities of U.S. government corporations and agencies 347,825 9,339 (658) 356,506 258,875 14,806 — 273,681 Corporate obligations 500 — — 500 2,021 5 (1) 2,025 Obligations of states and political subdivisions 81,310 4,746 86,056 117,439 6,988 — 124,427 Total Available-for-Sale Debt Securities (1) $ 850,672 $ 21,392 $ (3,070) $ 868,994 $ 737,005 $ 33,478 $ (90) $ 770,393 (1) Excludes interest receivable of $3.2 million at September 30, 2021 and $3.1 million at December 31, 2020. Interest receivable is included in other assets in the consolidated balance sheets.
Schedule of Fair Value and Age of Gross Unrealized Losses of Debt Securities	The following tables present the fair value and the age of gross unrealized losses on available-for-sale debt securities by investment category as of the dates presented: September 30, 2021 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities 4 $ 43,200 $ (248) — $ — $ — 4 $ 43,200 $ (248) Obligations of U.S. government corporations and agencies — — — — — — — — — Collateralized mortgage obligations of U.S. government corporations and agencies 7 88,290 (1,198) — — — 7 88,290 (1,198) Residential mortgage-backed securities of U.S. government corporations and agencies 3 48,497 (966) — — — 3 48,497 (966) Commercial mortgage-backed securities of U.S. government corporations and agencies 7 101,479 (658) — — — 7 101,479 (658) Corporate bonds — — — — — — — — — Obligations of states and political subdivisions 1 5,000 — — — — 1 5,000 — Total 22 $ 286,466 $ (3,070) — $ — $ — 22 $ 286,466 $ (3,070) December 31, 2020 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies — — — — — — — — — 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 bonds 1 499 (1) — — — 1 499 (1) Obligations of states and political subdivisions — — — — — — — — — Total 3 $ 36,196 $ (90) — $ — $ — 3 $ 36,196 $ (90)
Schedule of Unrealized Gains (Losses) of Debt Securities	The following table presents net unrealized gains and losses, net of tax, on available-for-sale debt securities included in accumulated other comprehensive income/(loss), for the periods presented: September 30, 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 available-for-sale debt securities $ 21,392 $ (3,070) $ 18,322 $ 33,478 $ (90) $ 33,388 Income tax (expense) benefit (4,569) 657 (3,912) (7,128) 19 (7,109) Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss) $ 16,823 $ (2,413) $ 14,410 $ 26,350 $ (71) $ 26,279
Schedule of Contractual Maturities of Debt Securities	The amortized cost and fair value of available-for-sale debt securities at September 30, 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. September 30, 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 $ 30,428 $ 30,760 Due after one year through five years 82,551 86,321 Due after five years through ten years 101,252 102,563 Due after ten years 20,936 22,917 Available-for-Sale Debt Securities With Fixed Maturities 235,167 242,561 Debt Securities without a single maturity date Collateralized mortgage obligations of U.S. government corporations and agencies 206,325 208,985 Residential mortgage-backed securities of U.S. government corporations and agencies 60,855 60,442 Commercial mortgage-backed securities of U.S. government corporations and agencies 347,825 356,506 Corporate Securities 500 500 Total Available-for-Sale Debt Securities $ 850,672 $ 868,994
Schedule of Unrealized Gains (Losses) on Marketable Securities	The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Marketable Equity Securities Net market gains/(losses) recognized $ 31 $ 585 $ 175 $ (552) Less: Net gains recognized for equity securities sold — — 29 142 Unrealized Gains/(Losses) on Equity Securities Still Held $ 31 $ 585 $ 146 $ (694)

Loans and Loans Held for Sale (

Loans and Loans Held for Sale (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Schedule of Composition of Loans	The following table presents loans as of the dates presented: (dollars in thousands) September 30, 2021 December 31, 2020 Commercial Commercial real estate $ 3,225,863 $ 3,244,974 Commercial and industrial 1,698,784 1,954,453 Commercial construction 499,317 474,280 Total Commercial Loans 5,423,964 5,673,707 Consumer Consumer real estate 1,448,517 1,471,238 Other consumer 97,606 80,915 Total Consumer Loans 1,546,123 1,552,153 Total Portfolio Loans 6,970,087 7,225,860 Loans held for sale 4,303 18,528 Total Loans (1) $ 6,974,390 $ 7,244,388
Summary of Restructured Loans for Periods Presented	The following tables summarize restructured loans as of the dates presented: September 30, 2021 December 31, 2020 (dollars in thousands) Performing Nonperforming Total Performing Nonperforming Total Commercial real estate $ 4,252 $ 11,093 $ 15,345 $ 14 $ 16,654 $ 16,668 Commercial and industrial 1,762 — 1,762 7,090 9,885 16,975 Commercial construction — — — 3,267 — 3,267 Business banking 1,647 1,492 3,139 1,503 430 1,933 Consumer real estate 6,120 1,448 7,569 5,581 2,319 7,900 Other consumer — — — 5 — 5 Total $ 13,782 $ 14,033 $ 27,815 $ 17,460 $ 29,289 $ 46,748 The following tables present the restructured loans by portfolio segment and by type of concession for the periods presented: Three Months Ended September 30, 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 — $ — $ — $ — $ — $ — $ — $ — Commercial industrial 2 — — 341 — — 341 342 Commercial construction — — — — — — — — Business banking — — — — — — — — Consumer real estate 9 317 — 31 — — 348 356 Other consumer — — — — — — — — Total 11 $ 317 $ — $ 372 $ — $ — $ 689 $ 698 (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. Three Months Ended September 30, 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 — $ — $ — $ — $ — $ — $ — $ — Commercial industrial 2 — — 3,735 — 287 4,022 4,021 Commercial construction — — — — — — — — Business banking 1 — — 171 — — 171 333 Consumer real estate 10 334 — 30 — — 364 334 Other consumer 1 4 — — — — 4 5 Total 14 $ 338 $ — $ 3,936 $ — $ 287 $ 4,561 $ 4,693 (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. Nine Months Ended September 30, 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 — $ — $ — $ — $ — $ — $ — $ — Commercial industrial 2 — — 772 — 5,196 5,968 6,304 Commercial construction — — — — — — — — Business banking 7 — 80 1,420 — — 1,500 1,551 Consumer real estate 20 866 31 147 1,045 1,064 Other consumer — — — — — — — — Total 29 $ 866 $ 80 $ 2,223 $ — $ 5,343 $ 8,513 $ 8,919 (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. Nine Months Ended September 30, 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 $ — $ — $ 2,210 $ — $ — $ 2,210 $ 2,210 Commercial industrial 3 — — 4,997 — 287 5,284 6,489 Commercial construction 3 — — 2,561 — — 2,561 2,592 Business banking 3 — — 171 — 97 268 501 Consumer real estate 23 1,052 — 206 — — 1,258 1,237 Other consumer 1 4 — — — — 4 5 Total 34 $ 1,056 $ — $ 10,145 $ — $ 384 $ 11,585 $ 13,034 (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.
Summary of Nonperforming Assets	The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) September 30, 2021 December 31, 2020 Nonperforming Assets Nonaccrual loans $ 97,279 $ 117,485 Nonaccrual TDRs 14,033 29,289 Total Nonaccrual Loans (1) 111,312 146,774 OREO 13,370 2,155 Total Nonperforming Assets $ 124,682 $ 148,929 (1) Included in nonperforming commercial loans is $1.7 million of loans held for sale. The following table presents loans on nonaccrual status by class of loan: September 30, 2021 September 30, 2021 For the three and nine months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual (2) Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 101,070 $ 54,797 $ 47,730 $ 493 $ 556 Commercial and industrial 16,985 33,909 12,566 6 88 Commercial construction 384 4,053 3,357 — — Business banking 17,122 10,221 1,492 57 333 Consumer real estate 11,117 8,143 — 86 405 Other consumer 96 189 — — 1 Total $ 146,774 $ 111,312 $ 65,145 $ 642 $ 1,383 (1) Represents only cash payments received and applied to interest on nonaccrual loans. (2) Included in nonperforming commercial loans is $1.7 million of loans held for sale. . 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.

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Schedule of Loans Credit Quality Indicators	The following tables presents loan balances by year of origination and internally assigned risk rating for our portfolio segments as of the dates presented: September 30, 2021 Risk Rating (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial real estate Pass $ 255,876 $ 323,514 $ 443,487 $ 341,387 $ 224,258 $ 716,460 $ 42,326 — $ 2,347,308 Special mention — 1,368 32,780 4,422 38,966 97,322 — 174,858 Substandard — 445 16,812 19,320 18,673 123,332 1,500 180,082 Doubtful — — 532 — — — — — 532 Total commercial real estate 255,876 325,327 493,611 365,129 281,897 937,114 43,826 — 2,702,780 Commercial and industrial Pass 401,200 156,589 145,923 98,137 43,019 133,945 428,398 — 1,407,211 Special mention 49 2,927 1,283 3,166 72 1,934 10,667 20,098 Substandard 5,196 — 19,180 1,374 5,258 5,532 5,017 41,557 Doubtful — — 9,332 — — — — — 9,332 Total commercial and industrial 406,445 159,516 175,718 102,677 48,349 141,411 444,082 1,478,198 Commercial construction Pass 100,774 134,440 172,508 33,903 996 4,298 21,714 — 468,633 Special mention — — — — — 4,491 — 4,491 Substandard — 2,149 7,416 — — 3,235 — 12,800 Doubtful — — — — — — — — — Total commercial construction 100,774 136,589 179,924 33,903 996 12,024 21,714 485,924 Business banking Pass 173,154 114,831 152,423 117,529 81,934 316,445 103,162 450 1,059,928 Special mention 113 153 890 1,406 935 6,265 199 121 10,082 Substandard 46 71 1,720 3,292 2,036 21,337 978 635 30,115 Doubtful — — — — — — — — — Total business banking 173,313 115,055 155,033 122,227 84,905 344,047 104,339 1,206 1,100,125 Consumer real estate Pass 89,026 107,534 94,583 58,622 42,789 242,252 435,213 23,088 1,093,107 Special mention — — — — — 2,163 — 2,163 Substandard — — 208 1,765 1,368 4,868 709 1,290 10,208 Doubtful — — — — — — — — — Total consumer real estate 89,026 107,534 94,791 60,387 44,157 249,283 435,922 24,378 1,105,478 Other consumer Pass 9,833 10,852 8,470 3,852 1,442 2,888 50,725 1,113 89,175 Special mention — — — — — — — — — Substandard — 52 105 150 368 5,930 255 1,547 8,407 Doubtful — — — — — — — — — Total other consumer 9,833 10,904 8,575 4,002 1,810 8,818 50,980 2,660 97,582 Pass 1,029,863 847,760 1,017,394 653,430 394,438 1,416,288 1,081,538 24,651 6,465,362 Special mention 162 4,448 34,953 8,994 39,973 112,175 10,866 121 211,692 Substandard 5,242 2,717 45,441 25,901 27,703 164,234 8,459 3,472 283,169 Doubtful — — 9,864 — — — — — 9,864 Total $ 1,035,267 $ 854,925 $ 1,107,652 $ 688,325 $ 462,114 $ 1,692,697 $ 1,100,863 $ 28,244 $ 6,970,087 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 Pass 1,355,292 1,136,716 792,352 502,350 494,436 1,337,222 1,011,297 25,724 6,655,389 Special Mention 5,274 47,302 19,350 24,802 57,026 91,677 24,296 124 269,851 Substandard 118 30,083 20,032 33,648 57,105 137,398 5,606 3,066 287,056 Doubtful — 645 — 4,401 1,989 6,529 — — 13,564 Total $ 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 presents loan balances by year of origination and performing and nonperforming status for our portfolio segments as of September 30, 2021 and December 31, 2020: September 30, 2021 (dollars in thousands) 2021 2020 2019 2018 2017 2016 and Prior Revolving Revolving-Term Total Commercial real estate Performing $ 255,876 $ 325,327 $ 477,766 $ 362,382 $ 275,458 $ 907,348 $ 43,826 $ — $ 2,647,983 Nonperforming — — 15,845 2,747 6,439 29,766 — — 54,797 Total commercial real estate 255,876 325,327 493,611 365,129 281,897 937,114 43,826 — 2,702,780 Commercial and industrial Performing 401,249 159,516 153,731 102,310 44,963 141,201 441,319 — 1,444,289 Nonperforming 5,196 21,987 367 3,386 210 2,763 — 33,909 Total commercial and industrial 406,445 159,516 175,718 102,677 48,349 141,411 444,082 1,478,198 Commercial construction Performing 100,774 136,589 176,567 33,903 996 11,328 21,714 — 481,871 Nonperforming — — 3,357 — — 696 — — 4,053 Total commercial construction 100,774 136,589 179,924 33,903 996 12,024 21,714 485,924 Business banking Performing 173,267 115,055 154,639 120,811 84,187 336,486 104,310 1,149 1,089,904 Nonperforming 46 — 394 1,416 718 7,561 29 57 10,221 Total business banking 173,313 115,055 155,033 122,227 84,905 344,047 104,339 1,206 1,100,125 Consumer real estate Performing 89,026 107,482 94,501 60,140 43,392 244,339 434,893 23,562 1,097,335 Nonperforming — 52 290 247 765 4,944 1,029 816 8,143 Total consumer real estate 89,026 107,534 94,791 60,387 44,157 249,283 435,922 24,378 1,105,478 Other consumer Performing 9,833 10,904 8,575 3,813 1,810 8,818 50,980 2,660 97,393 Nonperforming — — — 189 — — — — 189 Total other consumer 9,833 10,904 8,575 4,002 1,810 8,818 50,980 2,660 97,582 Performing 1,030,025 854,873 1,065,779 683,359 450,806 1,649,520 1,097,042 27,371 6,858,775 Nonperforming (1) 5,242 52 41,873 4,966 11,308 43,177 3,821 873 111,312 Total $ 1,035,267 $ 854,925 $ 1,107,652 $ 688,325 $ 462,114 $ 1,692,697 $ 1,100,863 $ 28,244 $ 6,970,087 (1) Included in nonperforming commercial loans is $1.7 million of loans held for sale with $0.3 million in 2010, $0.9 million in 2012 and $0.5 million in 2013. 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 $ 722,781 $ 47,830 $ — $ 2,690,877 Nonperforming — 16,404 — 6,675 20,212 57,779 — — 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 28,426 220,701 408,351 — 1,542,567 Nonperforming — 1,313 1,584 12,838 62 908 280 — 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 — 465,693 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 74,690 245,331 438,701 21,571 1,156,216 Nonperforming — 229 706 1,486 1,564 5,716 319 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 1,196,492 827,626 543,253 586,622 1,496,134 1,040,545 27,760 7,079,086 Nonperforming 30 18,254 4,108 21,948 23,934 76,692 654 1,154 146,774 Total $ 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 as of the dates presented: September 30, 2021 Type of Collateral (dollars in thousands) Real Estate Business Investment/Cash Other Commercial real estate $ 51,006 $ — $ — $ — Commercial and industrial 272 13,738 — 21,730 Commercial construction 6,057 — — — Business banking 1,714 1,424 — — Consumer real estate — — — — Total $ 59,049 $ 15,162 $ — $ 21,730 December 31, 2020 Type of Collateral (dollars in thousands) Real Estate Business 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
Schedule of 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: September 30, 2021 (dollars in thousands) Current 30-59 Days 60-89 Days Non - performing (2) Total Past Total Loans Commercial real estate $ 2,647,983 $ — $ — $ 54,797 $ 54,797 2,702,780 Commercial and industrial 1,444,289 — — 33,909 33,909 1,478,198 Commercial construction 481,871 — — 4,053 4,053 485,924 Business banking 1,088,013 970 921 10,221 12,112 1,100,125 Consumer real estate 1,095,557 833 945 8,143 9,921 1,105,478 Other consumer 97,151 219 23 189 431 97,582 Total (1) $ 6,854,864 $ 2,022 $ 1,889 $ 111,312 $ 115,223 $ 6,970,087 (1) We had 42 loans that were modified totaling $58.9 million under the CARES Act at September 30, 2021. 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 modifications, this delinquency table may not accurately reflect the credit risk associated with these loans. (2) Included in nonperforming commercial loans is $1.7 million of loans held for sale. December 31, 2020 (dollars in thousands) Current 30-59 Days 60-89 Days Past Due 90+ Days Still Accruing (2) Non - performing Total Past 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 (1) $ 7,069,730 $ 2,888 $ 5,965 $ 503 $ 146,774 $ 156,130 $ 7,225,860 (1) We had 52 loans that were modified totaling $195.6 million under the CARES Act 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. (2) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at December 31, 2020.
Schedule of Loans on Nonaccrual Status and Loans Past Due 90 days Or More	The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) September 30, 2021 December 31, 2020 Nonperforming Assets Nonaccrual loans $ 97,279 $ 117,485 Nonaccrual TDRs 14,033 29,289 Total Nonaccrual Loans (1) 111,312 146,774 OREO 13,370 2,155 Total Nonperforming Assets $ 124,682 $ 148,929 (1) Included in nonperforming commercial loans is $1.7 million of loans held for sale. The following table presents loans on nonaccrual status by class of loan: September 30, 2021 September 30, 2021 For the three and nine months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual (2) Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 101,070 $ 54,797 $ 47,730 $ 493 $ 556 Commercial and industrial 16,985 33,909 12,566 6 88 Commercial construction 384 4,053 3,357 — — Business banking 17,122 10,221 1,492 57 333 Consumer real estate 11,117 8,143 — 86 405 Other consumer 96 189 — — 1 Total $ 146,774 $ 111,312 $ 65,145 $ 642 $ 1,383 (1) Represents only cash payments received and applied to interest on nonaccrual loans. (2) Included in nonperforming commercial loans is $1.7 million of loans held for sale. . 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 the periods presented: Three Months Ended September 30, 2021 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 63,186 $ 14,426 $ 5,905 $ 14,756 $ 8,647 $ 2,717 $ 109,636 Provision for credit losses on loans (1) (7,856) 11,599 1,391 (2,689) (80) (63) 2,302 Charge-offs (3,661) (2) (56) (167) (76) (245) (4,207) Recoveries 1 216 2 241 33 123 616 Net (Charge-offs)/Recoveries (3,660) 214 (54) 74 (43) (122) (3,591) Balance at End of Period $ 51,670 $ 26,239 $ 7,242 $ 12,141 $ 8,524 $ 2,532 $ 108,348 (1) Excludes unfunded commitments Three Months Ended September 30, 2020 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 57,730 $ 19,164 $ 8,874 $ 14,404 $ 11,585 $ 2,852 $ 114,609 Provision for credit losses on loans (1) 23,839 (4,155) (1,617) 2,072 (797) (40) 19,302 Charge-offs (10,187) (1,196) — (1,748) (252) (284) (13,667) Recoveries 172 398 1 64 41 78 754 Net (Charge-offs)/Recoveries (10,015) (798) 1 (1,684) (211) (206) (12,913) Balance at End of Period $ 71,554 $ 14,211 $ 7,258 $ 14,792 $ 10,577 $ 2,606 $ 120,998 (1) Excludes unfunded commitments Nine Months Ended September 30, 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 (1) (2,922) 14,552 54 (2,736) (1,335) (1) 7,612 Charge-offs $ (12,030) $ (4,777) $ (56) $ (1,494) $ (422) $ (698) $ (19,477) Recoveries 966 364 5 454 267 545 2,601 Net (Charge-offs)/Recoveries (11,064) (4,413) (51) (1,040) (155) (153) (16,876) Balance at End of Period $ 51,670 $ 26,239 $ 7,242 $ 12,141 $ 8,524 $ 2,532 $ 108,348 (1) Excludes the provision for credit losses for unfunded commitments. Nine Months Ended September 30, 2020 (dollars in thousands) Commercial Commercial and 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 4,525 642 27,352 Provision for credit losses on loans (1) 52,185 62,949 2,712 4,197 32 1,489 123,564 Charge-offs (16,229) (72,692) — (2,469) (470) (1,556) (93,416) Recoveries 211 420 22 166 153 302 1,274 Net (Charge-offs)/Recoveries (16,018) (72,272) 22 (2,303) (317) (1,254) (92,142) Balance at End of Period $ 71,554 $ 14,211 $ 7,258 $ 14,792 $ 10,577 $ 2,606 $ 120,998 (1) Excludes unfunded commitments

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Value of Derivative Assets and Derivative Liabilities	The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented: Derivatives Derivatives (dollars in thousands) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts - Commercial Loans Fair value $ 42,177 $ 78,319 $ 42,554 $ 79,033 Notional amount 998,385 983,638 998,385 983,638 Collateral posted — — 43,190 77,930 Interest Rate Lock Commitments - Mortgage Loans Fair value 812 2,900 — — Notional amount 22,674 51,053 — — Forward Sale Contracts - Mortgage Loans Fair value 101 — — 385 Notional amount $ 18,915 $ — $ — $ 47,062
Schedule of Offsetting 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 as of the dates presented: Derivatives Derivatives (dollars in thousands) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 43,746 $ 82,655 $ 44,170 $ 82,626 Gross amounts offset (1,569) (4,336) (1,616) (3,593) Net Amounts Presented in the Consolidated Balance Sheets 42,177 78,319 42,554 79,033 Gross amounts not offset (1) — — (43,190) (77,930) Net Amount $ 42,177 $ 78,319 $ (636) $ 1,103 (1) Amounts represent collateral posted for the periods presented and included in other assets on our Consolidated Balance Sheets.
Schedule of Offsetting 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 as of the dates presented: Derivatives Derivatives (dollars in thousands) September 30, 2021 December 31, 2020 September 30, 2021 December 31, 2020 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 43,746 $ 82,655 $ 44,170 $ 82,626 Gross amounts offset (1,569) (4,336) (1,616) (3,593) Net Amounts Presented in the Consolidated Balance Sheets 42,177 78,319 42,554 79,033 Gross amounts not offset (1) — — (43,190) (77,930) Net Amount $ 42,177 $ 78,319 $ (636) $ 1,103 (1) Amounts represent collateral posted for the periods presented and included in other assets on our Consolidated Balance Sheets.
Schedule of 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 periods presented: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ 22 $ (537) $ 337 $ (485) Interest rate lock commitments—mortgage loans 192 86 712 2,877 Forward sale contracts—mortgage loans (325) 144 (2,314) (451) Total Derivatives (Loss)/Gain $ (111) $ (307) $ (1,265) $ 1,941

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 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: (dollars in thousands) September 30, 2021 December 31, 2020 Commitments to extend credit $ 2,500,541 $ 2,185,752 Standby letters of credit 90,250 89,095 Total $ 2,590,791 $ 2,274,847
Allowance for Credit Loss for Unfunded Loan Commitments	The following table presents activity in the allowance for credit losses on unfunded loan commitments as of the dates presented: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Balance at beginning of period $ 4,858 $ 7,004 $ 4,467 $ 3,112 Impact of adopting ASU 2016-13 at January 1, 2020 — — — 1,349 Balance after adoption of ASU 2016-13 4,858 7,004 4,467 4,461 Provision for credit losses 1,085 (1,816) 1,476 727 Total $ 5,943 $ 5,188 $ 5,943 $ 5,188

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of Tax Effects of Components of Other Comprehensive Loss	The following table presents the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 (dollars in thousands) Pre-Tax Tax Net of Tax Pre-Tax Tax Benefit (Expense) Net of Tax Change in net unrealized gains/(losses) on debt securities available-for-sale $ (5,676) $ 1,211 $ (4,465) $ (882) $ 188 $ (694) Adjustment to funded status of employee benefit plans (1) (215) 46 (169) 1,163 (248) 915 Other Comprehensive Income $ (5,891) $ 1,257 $ (4,634) $ 281 $ (60) $ 221 (1) Pension settlement accounting was recognized during the periods ended September 30, 2021 resulting in a charge of $0.4 million for the three months ended September 30, 2021 immediately recognizing a portion of unrecognized actuarial loss and a remeasurement of our pension obligation. Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 (dollars in thousands) Pre-Tax Tax Net of Tax Pre-Tax Tax Net of Tax Change in net unrealized gains/(losses) on available-for-sale debt securities $ (15,065) $ 3,215 $ (11,850) $ 24,883 $ (5,294) $ 19,589 Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1) — — — (142) 30 (112) Adjustment to funded status of employee benefit plans (1) 2,351 (501) 1,850 2,092 (446) 1,646 Other Comprehensive (Loss)/Income $ (12,714) $ 2,714 $ (10,000) $ 26,833 $ (5,710) $ 21,123 (1) Pension settlement accounting was recognized during the periods ended September 30, 2021 resulting in a charge of $1.3 million for the nine months ended September 30, 2021 immediately recognizing a portion of unrecognized actuarial loss and a remeasurement of our pension obligation.

Employee Benefits (Tables)

Employee Benefits (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Schedule of Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit	The following table summarizes the components of net periodic pension cost for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (dollars in thousands) 2021 2020 2021 2020 Components of Net Periodic Pension Cost Interest cost on projected benefit obligation $ 721 $ 905 $ 2,221 $ 2,686 Expected return on plan assets (668) (970) (2,029) (2,913) Net amortization 246 411 792 1,180 Settlement Charge 370 671 1,296 671 Net Periodic Pension Expense $ 669 $ 1,017 $ 2,280 $ 1,624

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator for Earnings per Share Basic and Diluted:
Net income (loss)	$ 27,598	$ 16,705	$ 87,866	$ (3,136)
Less: Income allocated to participating shares	125	52	408	0
Net Income Allocated to Shareholders	27,473	16,653	87,458	(3,136)
Net Income Available to Shareholders	$ 27,598	$ 16,705	$ 87,866	$ (3,136)
Denominators for Earnings per Share:
Weighted average shares outstanding—basic (in shares)	39,060,616	39,020,811	39,044,412	39,101,309
Add: Potentially dilutive shares (in shares)	86,157	20,656	89,194	0
Denominator for Treasury Stock Method—Diluted (in shares)	39,146,773	39,041,467	39,133,606	39,101,309
Add: Average participating shares outstanding (in shares)	1,464	0	458	0
Denominator for Two-Class Method—Diluted (in shares)	39,062,080	39,020,811	39,044,870	39,101,309
Earnings (loss) per share—basic (in dollars per share)	$ 0.71	$ 0.43	$ 2.25	$ (0.08)
Earnings (loss) per share—diluted (in dollars per share)	$ 0.70	$ 0.43	$ 2.24	$ (0.08)
Restricted Stock
Denominators for Earnings per Share:
Restricted stock considered anti-dilutive excluded from potentially dilutive shares (in shares)	163	19,449	615	1,137

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Debt securities, available-for-sale, excluding accrued interest	$ 868,994	$ 770,393
Marketable equity securities	1,127	3,300
U.S. Treasury securities
ASSETS
Debt securities, available-for-sale, excluding accrued interest	85,300	10,282
Obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	71,205	82,904
Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	208,985	209,296
Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	60,442	67,778
Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	356,506	273,681
Obligations of states and political subdivisions
ASSETS
Debt securities, available-for-sale, excluding accrued interest	86,056	124,427
Fair Value Measurements, Recurring
ASSETS
Debt securities, available-for-sale, excluding accrued interest	868,994	770,393
Marketable equity securities	1,127	3,300
Total Securities	870,121	773,693
Securities held in a deferred compensation plan	9,320	6,794
Total Assets	922,531	861,706
LIABILITIES
Total Liabilities	42,554	79,418
Fair Value Measurements, Recurring | U.S. Treasury securities
ASSETS
Debt securities, available-for-sale, excluding accrued interest	85,300	10,282
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	71,205	82,904
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	208,985	209,296
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	60,442	67,778
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	356,506	273,681
Fair Value Measurements, Recurring | Corporate obligations
ASSETS
Debt securities, available-for-sale, excluding accrued interest	500	2,025
Fair Value Measurements, Recurring | Obligations of states and political subdivisions
ASSETS
Debt securities, available-for-sale, excluding accrued interest	86,056	124,427
Fair Value Measurements, Recurring | Interest rate swaps
ASSETS
Derivative financial assets	42,177	78,319
LIABILITIES
Derivative financial liabilities	42,554	79,033
Fair Value Measurements, Recurring | Interest rate lock commitments
ASSETS
Derivative financial assets	812	2,900
Fair Value Measurements, Recurring | Forward sale contracts
ASSETS
Derivative financial assets	101
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements, Recurring | Level 1
ASSETS
Debt securities, available-for-sale, excluding accrued interest	85,300	10,282
Marketable equity securities	1,051	3,228
Total Securities	86,351	13,510
Securities held in a deferred compensation plan	9,320	6,794
Total Assets	95,671	20,304
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities
ASSETS
Debt securities, available-for-sale, excluding accrued interest	85,300	10,282
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	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, excluding accrued interest	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, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 1 | Corporate obligations
ASSETS
Debt securities, available-for-sale, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions
ASSETS
Debt securities, available-for-sale, excluding accrued interest	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, excluding accrued interest	783,694	760,111
Marketable equity securities	76	72
Total Securities	783,770	760,183
Securities held in a deferred compensation plan	0	0
Total Assets	825,947	838,502
LIABILITIES
Total Liabilities	42,554	79,418
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities
ASSETS
Debt securities, available-for-sale, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	71,205	82,904
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	208,985	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, excluding accrued interest	60,442	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, excluding accrued interest	356,506	273,681
Fair Value Measurements, Recurring | Level 2 | Corporate obligations
ASSETS
Debt securities, available-for-sale, excluding accrued interest	500	2,025
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions
ASSETS
Debt securities, available-for-sale, excluding accrued interest	86,056	124,427
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets	42,177	78,319
LIABILITIES
Derivative financial liabilities	42,554	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, excluding accrued interest	0	0
Marketable equity securities	0	0
Total Securities	0	0
Securities held in a deferred compensation plan	0	0
Total Assets	913	2,900
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities
ASSETS
Debt securities, available-for-sale, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities, available-for-sale, excluding accrued interest	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, excluding accrued interest	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, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 3 | Corporate obligations
ASSETS
Debt securities, available-for-sale, excluding accrued interest	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions
ASSETS
Debt securities, available-for-sale, excluding accrued interest	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	812	2,900
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets	$ 101
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	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a nonrecurring basis	$ 0	$ 0
Level 3
ASSETS
Total Assets	63,132,000	74,917,000
Collateral method | Level 3
ASSETS
Loans individually evaluated	41,135,000	67,402,000
Other real estate owned	13,313,000	1,953,000
Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights	7,015,000	4,976,000
Contractual agreement | Level 3
ASSETS
Loans held for sale	$ 1,669,000	$ 586,000
Minimum | Appraisal adjustment | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0	0
Minimum | Costs to sell | Collateral method | Level 3
ASSETS
Other real estate owned, measurement input	0.0400	0.0400
Minimum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.0921	0.0924
Minimum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.0793	0.0882
Maximum | Appraisal adjustment | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0.1700	0.4700
Maximum | Costs to sell | Collateral method | Level 3
ASSETS
Other real estate owned, measurement input	0.0700	0.0700
Maximum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.1254	0.1255
Maximum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.1496	0.1458
Weighted Average | Appraisal adjustment | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0.1368	0.1690
Weighted Average | Costs to sell | Collateral method | Level 3
ASSETS
Other real estate owned, measurement input	0.0677	0.0492
Weighted Average | Discount rate | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.0938	0.0942
Weighted Average | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.1069	0.1337

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Securities	$ 870,121	$ 773,693
Portfolio loans, net	6,861,739	7,108,248
LIABILITIES
Junior subordinated debt securities	64,128	64,083
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	934,377	229,666
Securities	870,121	773,693
Loans held for sale	4,303	18,528
Portfolio loans, net	6,897,715	7,108,248
Collateral receivable	43,193	77,936
Securities held in a deferred compensation plan	9,320	6,794
Mortgage servicing rights	7,015	4,976
LIABILITIES
Deposits	7,945,119	7,420,538
Securities sold under repurchase agreements	72,586	65,163
Short-term borrowings	0	75,000
Long-term borrowings	22,693	23,681
Junior subordinated debt securities	64,128	64,083
Carrying Value | Interest rate swaps
ASSETS
Derivative financial assets	42,177	78,319
LIABILITIES
Derivative financial liabilities	42,554	79,033
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets	813	2,900
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets	101
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	934,377	229,666
Securities	870,121	773,693
Loans held for sale	4,303	18,528
Portfolio loans, net	6,784,028	7,028,446
Collateral receivable	43,193	77,936
Securities held in a deferred compensation plan	9,320	6,794
Mortgage servicing rights	7,015	4,976
LIABILITIES
Deposits	7,944,461	7,422,894
Securities sold under repurchase agreements	72,586	65,163
Short-term borrowings	0	75,000
Long-term borrowings	23,172	24,545
Junior subordinated debt securities	64,128	64,083
Fair Value Measurements | Interest rate swaps
ASSETS
Derivative financial assets	42,177	78,319
LIABILITIES
Derivative financial liabilities	42,554	79,033
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets	813	2,900
Fair Value Measurements | Forward sale contracts
ASSETS
Derivative financial assets	101
LIABILITIES
Derivative financial liabilities		385
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits	934,377	229,666
Securities	86,351	13,510
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable	43,193	77,936
Securities held in a deferred compensation plan	9,320	6,794
Mortgage servicing rights	0	0
LIABILITIES
Deposits	6,743,851	6,033,075
Securities sold under repurchase agreements	72,586	65,163
Short-term borrowings	0	75,000
Long-term borrowings	4,349	4,494
Junior subordinated debt securities	64,128	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
LIABILITIES
Derivative financial liabilities		0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities	783,770	760,183
Loans held for sale	4,303	0
Portfolio loans, net	0	0
Collateral receivable	0	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	0	0
LIABILITIES
Deposits	1,200,610	1,389,819
Securities sold under repurchase agreements	0	0
Short-term borrowings	0	0
Long-term borrowings	18,823	20,051
Junior subordinated debt securities	0	0
Fair Value Measurements | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets	42,177	78,319
LIABILITIES
Derivative financial liabilities	42,554	79,033
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets	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	0	18,528
Portfolio loans, net	6,784,028	7,028,446
Collateral receivable	0	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	7,015	4,976
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	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets	813	2,900
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets	$ 101
LIABILITIES
Derivative financial liabilities		$ 0

Securities - Fair Values of Mar

Securities - Fair Values of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Debt securities, available-for-sale, excluding accrued interest	$ 868,994	$ 770,393
Marketable equity securities	1,127	3,300
Total Securities	$ 870,121	$ 773,693

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 850,672	$ 737,005
Gross Unrealized Gains	21,392	33,478
Gross Unrealized Losses	(3,070)	(90)
Fair Value	868,994	770,393
Interest receivable	3,200	3,100
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	85,222	9,980
Gross Unrealized Gains	326	302
Gross Unrealized Losses	(248)	0
Fair Value	85,300	10,282
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	68,635	78,755
Gross Unrealized Gains	2,570	4,149
Gross Unrealized Losses	0	0
Fair Value	71,205	82,904
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	206,325	202,975
Gross Unrealized Gains	3,858	6,410
Gross Unrealized Losses	(1,198)	(89)
Fair Value	208,985	209,296
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60,855	66,960
Gross Unrealized Gains	553	818
Gross Unrealized Losses	(966)	0
Fair Value	60,442	67,778
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	347,825	258,875
Gross Unrealized Gains	9,339	14,806
Gross Unrealized Losses	(658)	0
Fair Value	356,506	273,681
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
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]
Amortized Cost	81,310	117,439
Gross Unrealized Gains	4,746	6,988
Gross Unrealized Losses		0
Fair Value	$ 86,056	$ 124,427

Securities - Fair Value and Age

Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	22	3
Fair Value, Less Than 12 Months	$ 286,466	$ 36,196
Unrealized Losses, Less Than 12 Months	$ (3,070)	$ (90)
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	22	3
Fair Value, Total	$ 286,466	$ 36,196
Unrealized Losses, Total	$ (3,070)	$ (90)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	4	0
Fair Value, Less Than 12 Months	$ 43,200	$ 0
Unrealized Losses, Less Than 12 Months	$ (248)	$ 0
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	4	0
Fair Value, Total	$ 43,200	$ 0
Unrealized Losses, Total	$ (248)	$ 0
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	0	0
Fair Value, Less Than 12 Months	$ 0	$ 0
Unrealized Losses, Less Than 12 Months	$ 0	$ 0
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	0	0
Fair Value, Total	$ 0	$ 0
Unrealized Losses, Total	$ 0	$ 0
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	7	2
Fair Value, Less Than 12 Months	$ 88,290	$ 35,697
Unrealized Losses, Less Than 12 Months	$ (1,198)	$ (89)
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	7	2
Fair Value, Total	$ 88,290	$ 35,697
Unrealized Losses, Total	$ (1,198)	$ (89)
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	3	0
Fair Value, Less Than 12 Months	$ 48,497	$ 0
Unrealized Losses, Less Than 12 Months	$ (966)	$ 0
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	3	0
Fair Value, Total	$ 48,497	$ 0
Unrealized Losses, Total	$ (966)	$ 0
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	7	0
Fair Value, Less Than 12 Months	$ 101,479	$ 0
Unrealized Losses, Less Than 12 Months	$ (658)	$ 0
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	7	0
Fair Value, Total	$ 101,479	$ 0
Unrealized Losses, Total	$ (658)	$ 0
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	0	1
Fair Value, Less Than 12 Months	$ 0	$ 499
Unrealized Losses, Less Than 12 Months	$ 0	$ (1)
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	0	1
Fair Value, Total	$ 0	$ 499
Unrealized Losses, Total	$ 0	$ (1)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	1	0
Fair Value, Less Than 12 Months	$ 5,000	$ 0
Unrealized Losses, Less Than 12 Months	$ 0	$ 0
Number of Securities, 12 Months or More | security	0	0
Fair Value, 12 Months or More	$ 0	$ 0
Unrealized Losses, 12 Months or More	$ 0	$ 0
Number of Securities, Total | security	1	0
Fair Value, Total	$ 5,000	$ 0
Unrealized Losses, Total	$ 0	$ 0

Securities - Narrative (Details

Securities - Narrative (Details) $ in Millions	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security
Investments, Debt and Equity Securities [Abstract]
Number of debt securities in unrealized loss position | security	22	3
Securities pledged for regulatory and legal requirements | $	$ 435	$ 308.3

Securities - Unrealized Gains (

Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Gains	$ 21,392	$ 33,478
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Losses	(3,070)	(90)
Total unrealized gains/(losses) on debt securities available-for-sale, Net Unrealized Gains/(Losses)	18,322	33,388
Income tax (expense) benefit, Gross Unrealized Gains	(4,569)	(7,128)
Income tax (expense) benefit, Gross Unrealized Losses	657	19
Income tax (expense) benefit, Net Unrealized Gains/(Losses)	(3,912)	(7,109)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Gains	16,823	26,350
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Losses	(2,413)	(71)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Net Unrealized Gains/(Losses)	$ 14,410	$ 26,279

Securities - Contractual Maturi

Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 30,428
Due after one year through five years	82,551
Due after five years through ten years	101,252
Due after ten years	20,936
Available-for-Sale Debt Securities With Maturities, Amortized Cost	235,167
Amortized Cost	850,672	$ 737,005
Fair Value
Due in one year or less	30,760
Due after one year through five years	86,321
Due after five years through ten years	102,563
Due after ten years	22,917
Available-for-Sale Debt Securities With Maturities, Fair Value	242,561
Total Available-for-Sale Debt Securities, Fair Value	868,994	770,393
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	206,325
Amortized Cost	206,325	202,975
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	208,985
Total Available-for-Sale Debt Securities, Fair Value	208,985	209,296
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	60,855
Amortized Cost	60,855	66,960
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	60,442
Total Available-for-Sale Debt Securities, Fair Value	60,442	67,778
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	347,825
Amortized Cost	347,825	258,875
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	356,506
Total Available-for-Sale Debt Securities, Fair Value	356,506	$ 273,681
Corporate bonds
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	500
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	$ 500

Securities - Unrealized Gains_2

Securities - Unrealized Gains (Losses) on Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Net market gains/(losses) recognized	$ 31	$ 585	$ 175	$ (552)
Less: Net gains recognized for equity securities sold	0	0	29	142
Unrealized Gains/(Losses) on Equity Securities Still Held	$ 31	$ 585	$ 146	$ (694)

Loans and Loans Held for Sale -

Loans and Loans Held for Sale - Narrative (Details) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)SecurityLoan	Mar. 31, 2021USD ($)	Sep. 30, 2020USD ($)SecurityLoan	Sep. 30, 2021USD ($)SecurityLoan	Sep. 30, 2020USD ($)SecurityLoan	Dec. 31, 2020USD ($)SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unearned income	$ 14,500			$ 14,500		$ 16,000
Purchase accounting fair value adjustments	6,400			6,400		8,600
Total loans	6,861,739			6,861,739		7,108,248
Loans held for investment, outstanding balance	$ 6,970,087			$ 6,970,087		7,225,860
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status				6 months
Number of troubled debt restructuring loans returned to accruing status | SecurityLoan	1		2	6	3
Financing receivable, troubled debt restructuring, returned to accruing status	$ 100		$ 100	$ 500	$ 22,700
Number of commitments to lend additional funds on TDRs | SecurityLoan	12			12
Commitments to lend additional funds on TDRs	$ 300			$ 300
Minimum period of loan payment defaults following restructure for TDRs to be in default				90 days
Number of defaulted TDRs that were restructured within the last twelve months prior to defaulting | SecurityLoan	0		0	0	6
Amount of defaulted TDRs that were restructured within the last twelve months prior to defaulting					$ 18,100
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	$ 5,423,964			$ 5,423,964		$ 5,673,707
Financing receivable, before allowance for credit loss, reclassification during period		$ 90,200
Percentage of commercial loans in total portfolio loans	77.80%			77.80%		78.50%
Commercial | CARES Act, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 181,000			$ 181,000		$ 465,000
Number of modified loans | SecurityLoan				42		52
Modified loans				$ 58,900		$ 195,600
Business banking portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	1,100,000			1,100,000		1,200,000
Business banking portfolio | CARES Act, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in finance receivables	(100,500)			(100,500)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	1,546,123			1,546,123		1,552,153
Financing receivable, before allowance for credit loss, reclassification during period		$ 23,200
Commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	2,702,780			2,702,780		2,791,947
Commercial real estate | Business banking portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	523,100			523,100		453,000
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	1,478,198			1,478,198		1,559,552
Commercial and industrial | Business banking portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	220,600			220,600		394,900
Commercial and industrial | Business banking portfolio | CARES Act, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	78,000			78,000		178,400
Commercial construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	485,924			485,924		466,077
Commercial construction | Business banking portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	13,400			13,400		8,200
Consumer real estate | Business banking portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	343,000			343,000
Consumer real estate | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	1,105,478			1,105,478		1,167,332
Business banking | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	1,100,125			1,100,125		1,160,067
Business banking | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance						303,900
CRE and commercial construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment, outstanding balance	$ 3,700,000			$ 3,700,000		$ 3,700,000
Combined percentage of commercial real estate and commercial construction in total commercial loans	68.70%			68.70%		65.60%
Combined percentage of commercial real estate and commercial construction in total portfolio loans	53.40%			53.40%		51.50%
Out of market exposure of combined portfolio	5.00%			5.00%		5.90%
Percentage of total loans out-of-state excluding contiguous states	2.70%			2.70%		3.00%

Loans and Loans Held for Sale_2

Loans and Loans Held for Sale - Composition of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Composition of the loans
Portfolio loans, net of unearned income	$ 6,970,087	$ 7,225,860
Loans held for sale	4,303	18,528
Total Loans	6,974,390	7,244,388
Interest receivable	19,100	24,700
Commercial
Composition of the loans
Portfolio loans, net of unearned income	5,423,964	5,673,707
Consumer
Composition of the loans
Portfolio loans, net of unearned income	1,546,123	1,552,153
Commercial real estate | Commercial
Composition of the loans
Portfolio loans, net of unearned income	3,225,863	3,244,974
Commercial and industrial | Commercial
Composition of the loans
Portfolio loans, net of unearned income	1,698,784	1,954,453
Commercial construction | Commercial
Composition of the loans
Portfolio loans, net of unearned income	499,317	474,280
Consumer real estate | Consumer
Composition of the loans
Portfolio loans, net of unearned income	1,448,517	1,471,238
Other consumer | Consumer
Composition of the loans
Portfolio loans, net of unearned income	$ 97,606	$ 80,915

Loans and Loans Held for Sale_3

Loans and Loans Held for Sale - Summary of Restructured Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 689	$ 4,561	$ 8,513	$ 11,585
Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	0	0	2,210
Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	341	4,022	5,968	5,284
Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	0	0	2,561
Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	171	1,500	268
Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	348	364	1,045	1,258
Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 0	$ 4	0	$ 4
Total TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			27,815		$ 46,748
Total TDRs | Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			15,345		16,668
Total TDRs | Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,762		16,975
Total TDRs | Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		3,267
Total TDRs | Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			3,139		1,933
Total TDRs | Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			7,569		7,900
Total TDRs | Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		5
Performing TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			13,782		17,460
Performing TDRs | Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			4,252		14
Performing TDRs | Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,762		7,090
Performing TDRs | Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		3,267
Performing TDRs | Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,647		1,503
Performing TDRs | Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			6,120		5,581
Performing TDRs | Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		5
Nonperforming TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			14,033		29,289
Nonperforming TDRs | Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			11,093		16,654
Nonperforming TDRs | Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		9,885
Nonperforming TDRs | Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		0
Nonperforming TDRs | Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,492		430
Nonperforming TDRs | Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,448		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 Segment and Type of Concession (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	11	14	29	34
Pre-Modification Outstanding Recorded Investment	$ 698	$ 4,693	$ 8,919	$ 13,034
Post-Modification Outstanding Recorded Investment	689	4,561	8,513	11,585
Bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	317	338	866	1,056
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	80	0
Extend Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	372	3,936	2,223	10,145
Modify Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Modify Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 287	$ 5,343	$ 384
Commercial real estate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 2,210
Post-Modification Outstanding Recorded Investment	0	0	0	2,210
Commercial real estate | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial real estate | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial real estate | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	2,210
Commercial real estate | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial real estate | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial and industrial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	2	2	2	3
Pre-Modification Outstanding Recorded Investment	$ 342	$ 4,021	$ 6,304	$ 6,489
Post-Modification Outstanding Recorded Investment	341	4,022	5,968	5,284
Commercial and industrial | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial and industrial | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial and industrial | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	341	3,735	772	4,997
Commercial and industrial | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial and industrial | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 287	$ 5,196	$ 287
Commercial construction | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 2,592
Post-Modification Outstanding Recorded Investment	0	0	0	2,561
Commercial construction | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial construction | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial construction | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	2,561
Commercial construction | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Commercial construction | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Business banking | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	1	7	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 333	$ 1,551	$ 501
Post-Modification Outstanding Recorded Investment	0	171	1,500	268
Business banking | Bankruptcy | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Business banking | Other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	80	0
Business banking | Extend Maturity | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	171	1,420	171
Business banking | Modify Rate | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Business banking | Modify Payments | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 97
Consumer real estate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	9	10	20	23
Pre-Modification Outstanding Recorded Investment	$ 356	$ 334	$ 1,064	$ 1,237
Post-Modification Outstanding Recorded Investment	348	364	1,045	1,258
Consumer real estate | Bankruptcy | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	317	334	866	1,052
Consumer real estate | Other | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0		0
Consumer real estate | Extend Maturity | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	31	30	31	206
Consumer real estate | Modify Rate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0		0
Consumer real estate | Modify Payments | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 147	$ 0
Other consumer | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	1	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 5	$ 0	$ 5
Post-Modification Outstanding Recorded Investment	0	4	0	4
Other consumer | Bankruptcy | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	4	0	4
Other consumer | Other | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Extend Maturity | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Modify Rate | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Other consumer | Modify Payments | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0

Loans and Loans Held for Sale_5

Loans and Loans Held for Sale - Nonperforming Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Nonperforming Assets
Nonaccrual loans	$ 97,279	$ 117,485
Nonaccrual TDRs	14,033	29,289
Total Nonaccrual Loans	111,312	146,774	$ 54,057
OREO	13,370	2,155
Total Nonperforming Assets	124,682	$ 148,929
Commercial
Nonperforming Assets
Non - performing	$ 1,700

Allowance for Credit Losses - L

Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,035,267	$ 1,360,684
Year two	854,925	1,214,746
Year three	1,107,652	831,734
Year four	688,325	565,201
Year five	462,114	610,556
More than five years	1,692,697	1,572,826
Revolving	1,100,863	1,041,199
Revolving-Term	28,244	28,914
Total	6,970,087	7,225,860
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,029,863	1,355,292
Year two	847,760	1,136,716
Year three	1,017,394	792,352
Year four	653,430	502,350
Year five	394,438	494,436
More than five years	1,416,288	1,337,222
Revolving	1,081,538	1,011,297
Revolving-Term	24,651	25,724
Total	6,465,362	6,655,389
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	162	5,274
Year two	4,448	47,302
Year three	34,953	19,350
Year four	8,994	24,802
Year five	39,973	57,026
More than five years	112,175	91,677
Revolving	10,866	24,296
Revolving-Term	121	124
Total	211,692	269,851
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,242	118
Year two	2,717	30,083
Year three	45,441	20,032
Year four	25,901	33,648
Year five	27,703	57,105
More than five years	164,234	137,398
Revolving	8,459	5,606
Revolving-Term	3,472	3,066
Total	283,169	287,056
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	645
Year three	9,864	0
Year four	0	4,401
Year five	0	1,989
More than five years	0	6,529
Revolving	0	0
Revolving-Term	0	0
Total	9,864	13,564
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,423,964	5,673,707
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	255,876	334,086
Year two	325,327	476,203
Year three	493,611	417,944
Year four	365,129	320,140
Year five	281,897	415,184
More than five years	937,114	780,560
Revolving	43,826	47,830
Revolving-Term	0	0
Total	2,702,780	2,791,947
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	406,445	457,828
Year two	159,516	215,457
Year three	175,718	145,290
Year four	102,677	82,249
Year five	48,349	28,488
More than five years	141,411	221,609
Revolving	444,082	408,631
Revolving-Term		0
Total	1,478,198	1,559,552
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	100,774	132,813
Year two	136,589	230,907
Year three	179,924	63,535
Year four	33,903	2,921
Year five	996	6,346
More than five years	12,024	16,777
Revolving	21,714	12,778
Revolving-Term		0
Total	485,924	466,077
Commercial | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	173,313	296,357
Year two	115,055	156,473
Year three	155,033	128,250
Year four	122,227	91,363
Year five	84,905	82,202
More than five years	344,047	298,779
Revolving	104,339	105,549
Revolving-Term	1,206	1,094
Total	1,100,125	1,160,067
Commercial | Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	255,876	334,086
Year two	323,514	422,800
Year three	443,487	394,963
Year four	341,387	277,724
Year five	224,258	307,321
More than five years	716,460	615,217
Revolving	42,326	46,330
Revolving-Term	0	0
Total	2,347,308	2,398,441
Commercial | Pass | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	401,200	454,131
Year two	156,589	199,453
Year three	145,923	140,049
Year four	98,137	68,607
Year five	43,019	27,645
More than five years	133,945	206,782
Revolving	428,398	383,082
Revolving-Term	0	0
Total	1,407,211	1,479,749
Commercial | Pass | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	100,774	131,235
Year two	134,440	224,794
Year three	172,508	59,649
Year four	33,903	2,420
Year five	996	6,346
More than five years	4,298	4,555
Revolving	21,714	12,778
Revolving-Term	0	0
Total	468,633	441,777
Commercial | Pass | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	173,154	296,254
Year two	114,831	154,335
Year three	152,423	123,207
Year four	117,529	86,552
Year five	81,934	77,238
More than five years	316,445	266,042
Revolving	103,162	103,571
Revolving-Term	450	291
Total	1,059,928	1,107,490
Commercial | Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	1,368	35,499
Year three	32,780	10,200
Year four	4,422	22,502
Year five	38,966	55,174
More than five years	97,322	75,022
Revolving	0	0
Revolving-Term		0
Total	174,858	198,397
Commercial | Special mention | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	49	3,697
Year two	2,927	8,211
Year three	1,283	2,628
Year four	3,166	697
Year five	72	768
More than five years	1,934	1,046
Revolving	10,667	23,527
Revolving-Term		0
Total	20,098	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	4,491	8,593
Revolving	0	0
Revolving-Term		0
Total	4,491	16,590
Commercial | Special mention | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	113	0
Year two	153	1,060
Year three	890	1,147
Year four	1,406	1,602
Year five	935	1,084
More than five years	6,265	6,866
Revolving	199	637
Revolving-Term	121	123
Total	10,082	12,519
Commercial | Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	445	17,259
Year three	16,812	12,781
Year four	19,320	19,914
Year five	18,673	50,700
More than five years	123,332	83,792
Revolving	1,500	1,500
Revolving-Term		0
Total	180,082	185,946
Commercial | Substandard | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,196	0
Year two	0	7,793
Year three	19,180	2,613
Year four	1,374	8,544
Year five	5,258	75
More than five years	5,532	13,781
Revolving	5,017	2,022
Revolving-Term		0
Total	41,557	34,828
Commercial | Substandard | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	2,149	3,580
Year three	7,416	0
Year four	0	501
Year five	0	0
More than five years	3,235	3,629
Revolving	0	0
Revolving-Term		0
Total	12,800	7,710
Commercial | Substandard | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	46	103
Year two	71	1,078
Year three	1,720	3,896
Year four	3,292	3,209
Year five	2,036	3,880
More than five years	21,337	25,871
Revolving	978	1,341
Revolving-Term	635	680
Total	30,115	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	532	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	532	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	9,332	0
Year four	0	4,401
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	9,332	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
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,546,123	1,552,153
Consumer | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Total		303,900
Consumer | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	89,026	120,736
Year two	107,534	122,544
Year three	94,791	69,931
Year four	60,387	65,133
Year five	44,157	76,254
More than five years	249,283	251,047
Revolving	435,922	439,020
Revolving-Term	24,378	22,667
Total	1,105,478	1,167,332
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,833	18,864
Year two	10,904	13,162
Year three	8,575	6,784
Year four	4,002	3,395
Year five	1,810	2,082
More than five years	8,818	4,054
Revolving	50,980	27,391
Revolving-Term	2,660	5,153
Total	97,582	80,885
Consumer | Pass | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	89,026	120,736
Year two	107,534	122,171
Year three	94,583	67,700
Year four	58,622	63,653
Year five	42,789	73,805
More than five years	242,252	243,939
Revolving	435,213	438,888
Revolving-Term	23,088	22,667
Total	1,093,107	1,153,559
Consumer | Pass | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,833	18,849
Year two	10,852	13,162
Year three	8,470	6,784
Year four	3,852	3,395
Year five	1,442	2,082
More than five years	2,888	687
Revolving	50,725	26,647
Revolving-Term	1,113	2,767
Total	89,175	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	2,163	150
Revolving	0	132
Revolving-Term		0
Total	2,163	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	208	742
Year four	1,765	1,480
Year five	1,368	2,449
More than five years	4,868	6,958
Revolving	709	0
Revolving-Term	1,290	0
Total	10,208	12,002
Consumer | Substandard | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	15
Year two	52	0
Year three	105	0
Year four	150	0
Year five	368	0
More than five years	5,930	3,367
Revolving	255	744
Revolving-Term	1,547	2,386
Total	8,407	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	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,035,267	$ 1,360,684
Year two	854,925	1,214,746
Year three	1,107,652	831,734
Year four	688,325	565,201
Year five	462,114	610,556
More than five years	1,692,697	1,572,826
Revolving	1,100,863	1,041,199
Revolving-Term	28,244	28,914
Total	6,970,087	7,225,860
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,030,025	1,360,654
Year two	854,873	1,196,492
Year three	1,065,779	827,626
Year four	683,359	543,253
Year five	450,806	586,622
More than five years	1,649,520	1,496,134
Revolving	1,097,042	1,040,545
Revolving-Term	27,371	27,760
Total	6,858,775	7,079,086
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,242	30
Year two	52	18,254
Year three	41,873	4,108
Year four	4,966	21,948
Year five	11,308	23,934
More than five years	43,177	76,692
Revolving	3,821	654
Revolving-Term	873	1,154
Total	111,312	146,774
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,029,863	1,355,292
Year two	847,760	1,136,716
Year three	1,017,394	792,352
Year four	653,430	502,350
Year five	394,438	494,436
More than five years	1,416,288	1,337,222
Revolving	1,081,538	1,011,297
Revolving-Term	24,651	25,724
Total	6,465,362	6,655,389
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	162	5,274
Year two	4,448	47,302
Year three	34,953	19,350
Year four	8,994	24,802
Year five	39,973	57,026
More than five years	112,175	91,677
Revolving	10,866	24,296
Revolving-Term	121	124
Total	211,692	269,851
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,242	118
Year two	2,717	30,083
Year three	45,441	20,032
Year four	25,901	33,648
Year five	27,703	57,105
More than five years	164,234	137,398
Revolving	8,459	5,606
Revolving-Term	3,472	3,066
Total	283,169	287,056
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	645
Year three	9,864	0
Year four	0	4,401
Year five	0	1,989
More than five years	0	6,529
Revolving	0	0
Revolving-Term	0	0
Total	9,864	13,564
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,423,964	5,673,707
Non - performing	1,700
Commercial | 2010
Financing Receivable, Credit Quality Indicator [Line Items]
Non - performing	300
Commercial | 2012
Financing Receivable, Credit Quality Indicator [Line Items]
Non - performing	900
Commercial | 2013
Financing Receivable, Credit Quality Indicator [Line Items]
Non - performing	500
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	255,876	334,086
Year two	325,327	476,203
Year three	493,611	417,944
Year four	365,129	320,140
Year five	281,897	415,184
More than five years	937,114	780,560
Revolving	43,826	47,830
Revolving-Term	0	0
Total	2,702,780	2,791,947
Commercial | Commercial real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	255,876	334,086
Year two	325,327	459,799
Year three	477,766	417,944
Year four	362,382	313,465
Year five	275,458	394,972
More than five years	907,348	722,781
Revolving	43,826	47,830
Revolving-Term	0	0
Total	2,647,983	2,690,877
Commercial | Commercial real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	16,404
Year three	15,845	0
Year four	2,747	6,675
Year five	6,439	20,212
More than five years	29,766	57,779
Revolving	0	0
Revolving-Term	0	0
Total	54,797	101,070
Commercial | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	255,876	334,086
Year two	323,514	422,800
Year three	443,487	394,963
Year four	341,387	277,724
Year five	224,258	307,321
More than five years	716,460	615,217
Revolving	42,326	46,330
Revolving-Term	0	0
Total	2,347,308	2,398,441
Commercial | Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	1,368	35,499
Year three	32,780	10,200
Year four	4,422	22,502
Year five	38,966	55,174
More than five years	97,322	75,022
Revolving	0	0
Revolving-Term		0
Total	174,858	198,397
Commercial | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	445	17,259
Year three	16,812	12,781
Year four	19,320	19,914
Year five	18,673	50,700
More than five years	123,332	83,792
Revolving	1,500	1,500
Revolving-Term		0
Total	180,082	185,946
Commercial | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	645
Year three	532	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	532	9,163
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	406,445	457,828
Year two	159,516	215,457
Year three	175,718	145,290
Year four	102,677	82,249
Year five	48,349	28,488
More than five years	141,411	221,609
Revolving	444,082	408,631
Revolving-Term		0
Total	1,478,198	1,559,552
Commercial | Commercial and industrial | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	401,249	457,828
Year two	159,516	214,144
Year three	153,731	143,706
Year four	102,310	69,411
Year five	44,963	28,426
More than five years	141,201	220,701
Revolving	441,319	408,351
Revolving-Term	0	0
Total	1,444,289	1,542,567
Commercial | Commercial and industrial | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,196	0
Year two		1,313
Year three	21,987	1,584
Year four	367	12,838
Year five	3,386	62
More than five years	210	908
Revolving	2,763	280
Revolving-Term	0	0
Total	33,909	16,985
Commercial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	401,200	454,131
Year two	156,589	199,453
Year three	145,923	140,049
Year four	98,137	68,607
Year five	43,019	27,645
More than five years	133,945	206,782
Revolving	428,398	383,082
Revolving-Term	0	0
Total	1,407,211	1,479,749
Commercial | Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	49	3,697
Year two	2,927	8,211
Year three	1,283	2,628
Year four	3,166	697
Year five	72	768
More than five years	1,934	1,046
Revolving	10,667	23,527
Revolving-Term		0
Total	20,098	40,574
Commercial | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	5,196	0
Year two	0	7,793
Year three	19,180	2,613
Year four	1,374	8,544
Year five	5,258	75
More than five years	5,532	13,781
Revolving	5,017	2,022
Revolving-Term		0
Total	41,557	34,828
Commercial | Commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	9,332	0
Year four	0	4,401
Year five	0	0
More than five years	0	0
Revolving	0	0
Revolving-Term	0	0
Total	9,332	4,401
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	100,774	132,813
Year two	136,589	230,907
Year three	179,924	63,535
Year four	33,903	2,921
Year five	996	6,346
More than five years	12,024	16,777
Revolving	21,714	12,778
Revolving-Term		0
Total	485,924	466,077
Commercial | Commercial construction | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	100,774	132,813
Year two	136,589	230,907
Year three	176,567	63,535
Year four	33,903	2,921
Year five	996	6,346
More than five years	11,328	16,393
Revolving	21,714	12,778
Revolving-Term	0	0
Total	481,871	465,693
Commercial | Commercial construction | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	3,357	0
Year four	0	0
Year five	0	0
More than five years	696	384
Revolving	0	0
Revolving-Term	0	0
Total	4,053	384
Commercial | Commercial construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	100,774	131,235
Year two	134,440	224,794
Year three	172,508	59,649
Year four	33,903	2,420
Year five	996	6,346
More than five years	4,298	4,555
Revolving	21,714	12,778
Revolving-Term	0	0
Total	468,633	441,777
Commercial | Commercial construction | Special mention
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	4,491	8,593
Revolving	0	0
Revolving-Term		0
Total	4,491	16,590
Commercial | Commercial construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	2,149	3,580
Year three	7,416	0
Year four	0	501
Year five	0	0
More than five years	3,235	3,629
Revolving	0	0
Revolving-Term		0
Total	12,800	7,710
Commercial | Commercial construction | Doubtful
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 | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	173,313	296,357
Year two	115,055	156,473
Year three	155,033	128,250
Year four	122,227	91,363
Year five	84,905	82,202
More than five years	344,047	298,779
Revolving	104,339	105,549
Revolving-Term	1,206	1,094
Total	1,100,125	1,160,067
Commercial | Business banking | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	173,267	296,327
Year two	115,055	156,164
Year three	154,639	126,432
Year four	120,811	90,414
Year five	84,187	80,106
More than five years	336,486	286,970
Revolving	104,310	105,494
Revolving-Term	1,149	1,037
Total	1,089,904	1,142,944
Commercial | Business banking | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	46	30
Year two	0	309
Year three	394	1,818
Year four	1,416	949
Year five	718	2,096
More than five years	7,561	11,809
Revolving	29	55
Revolving-Term	57	57
Total	10,221	17,123
Commercial | Business banking | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	173,154	296,254
Year two	114,831	154,335
Year three	152,423	123,207
Year four	117,529	86,552
Year five	81,934	77,238
More than five years	316,445	266,042
Revolving	103,162	103,571
Revolving-Term	450	291
Total	1,059,928	1,107,490
Commercial | Business banking | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	113	0
Year two	153	1,060
Year three	890	1,147
Year four	1,406	1,602
Year five	935	1,084
More than five years	6,265	6,866
Revolving	199	637
Revolving-Term	121	123
Total	10,082	12,519
Commercial | Business banking | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	46	103
Year two	71	1,078
Year three	1,720	3,896
Year four	3,292	3,209
Year five	2,036	3,880
More than five years	21,337	25,871
Revolving	978	1,341
Revolving-Term	635	680
Total	30,115	40,058
Commercial | Business banking | Doubtful
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
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,546,123	1,552,153
Consumer | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Total		303,900
Consumer | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	89,026	120,736
Year two	107,534	122,544
Year three	94,791	69,931
Year four	60,387	65,133
Year five	44,157	76,254
More than five years	249,283	251,047
Revolving	435,922	439,020
Revolving-Term	24,378	22,667
Total	1,105,478	1,167,332
Consumer | Consumer real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	89,026	120,736
Year two	107,482	122,315
Year three	94,501	69,225
Year four	60,140	63,647
Year five	43,392	74,690
More than five years	244,339	245,331
Revolving	434,893	438,701
Revolving-Term	23,562	21,571
Total	1,097,335	1,156,216
Consumer | Consumer real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	52	229
Year three	290	706
Year four	247	1,486
Year five	765	1,564
More than five years	4,944	5,716
Revolving	1,029	319
Revolving-Term	816	1,096
Total	8,143	11,116
Consumer | Consumer real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	89,026	120,736
Year two	107,534	122,171
Year three	94,583	67,700
Year four	58,622	63,653
Year five	42,789	73,805
More than five years	242,252	243,939
Revolving	435,213	438,888
Revolving-Term	23,088	22,667
Total	1,093,107	1,153,559
Consumer | Consumer real estate | Special mention
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	2,163	150
Revolving	0	132
Revolving-Term		0
Total	2,163	1,771
Consumer | Consumer real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	373
Year three	208	742
Year four	1,765	1,480
Year five	1,368	2,449
More than five years	4,868	6,958
Revolving	709	0
Revolving-Term	1,290	0
Total	10,208	12,002
Consumer | Consumer real estate | Doubtful
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 | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,833	18,864
Year two	10,904	13,162
Year three	8,575	6,784
Year four	4,002	3,395
Year five	1,810	2,082
More than five years	8,818	4,054
Revolving	50,980	27,391
Revolving-Term	2,660	5,153
Total	97,582	80,885
Consumer | Other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,833	18,864
Year two	10,904	13,162
Year three	8,575	6,784
Year four	3,813	3,395
Year five	1,810	2,082
More than five years	8,818	3,958
Revolving	50,980	27,391
Revolving-Term	2,660	5,153
Total	97,393	80,789
Consumer | Other consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	0
Year four	189	0
Year five	0	0
More than five years	0	96
Revolving	0	0
Revolving-Term	0	0
Total	189	96
Consumer | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,833	18,849
Year two	10,852	13,162
Year three	8,470	6,784
Year four	3,852	3,395
Year five	1,442	2,082
More than five years	2,888	687
Revolving	50,725	26,647
Revolving-Term	1,113	2,767
Total	89,175	74,373
Consumer | Other consumer | Special mention
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 | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	15
Year two	52	0
Year three	105	0
Year four	150	0
Year five	368	0
More than five years	5,930	3,367
Revolving	255	744
Revolving-Term	1,547	2,386
Total	8,407	6,512
Consumer | Other consumer | Doubtful
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 - A

Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021USD ($)SecurityLoan	Dec. 31, 2020USD ($)SecurityLoan	Dec. 31, 2019USD ($)
Financing Receivable, Past Due [Line Items]
Total	$ 6,970,087	$ 7,225,860
Non - performing	111,312	146,774	$ 54,057
Current
Financing Receivable, Past Due [Line Items]
Total	6,854,864	7,069,730
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Total	115,223	156,130
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	2,022	2,888
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	1,889	5,965
Past Due 90+ Days Still Accruing
Financing Receivable, Past Due [Line Items]
Total		503
Commercial
Financing Receivable, Past Due [Line Items]
Total	5,423,964	$ 5,673,707
Non - performing	$ 1,700
Commercial | CARES Act, Paycheck Protection Program Loans
Financing Receivable, Past Due [Line Items]
Number of modified loans | SecurityLoan	42	52
Modified loans	$ 58,900	$ 195,600
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,702,780	2,791,947
Non - performing	54,797	101,070	25,356
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,478,198	1,559,552
Non - performing	33,909	16,985	10,911
Commercial | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	485,924	466,077
Non - performing	4,053	384	737
Commercial | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,100,125	1,160,067
Non - performing	10,221	17,122	9,863
Commercial | Current | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,647,983	2,690,877
Commercial | Current | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,444,289	1,542,567
Commercial | Current | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	481,871	462,094
Commercial | Current | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,088,013	1,140,581
Commercial | Total Past Due Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	54,797	101,070
Commercial | Total Past Due Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	33,909	16,985
Commercial | Total Past Due Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	4,053	3,983
Commercial | Total Past Due Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total	12,112	19,486
Commercial | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | 30-59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | 30-59 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	0	19
Commercial | 30-59 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total	970	1,614
Commercial | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | 60-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial | 60-89 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	0	3,580
Commercial | 60-89 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total	921	379
Commercial | Past Due 90+ Days Still Accruing | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total		0
Commercial | Past Due 90+ Days Still Accruing | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total		0
Commercial | Past Due 90+ Days Still Accruing | Commercial construction
Financing Receivable, Past Due [Line Items]
Total		0
Commercial | Past Due 90+ Days Still Accruing | Business banking
Financing Receivable, Past Due [Line Items]
Total		371
Consumer
Financing Receivable, Past Due [Line Items]
Total	1,546,123	1,552,153
Consumer | Business banking
Financing Receivable, Past Due [Line Items]
Total		303,900
Consumer | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,105,478	1,167,332
Non - performing	8,143	11,117	6,063
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total	97,582	80,885
Non - performing	189	96	$ 1,127
Consumer | Current | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,095,557	1,153,028
Consumer | Current | Other consumer
Financing Receivable, Past Due [Line Items]
Total	97,151	80,583
Consumer | Total Past Due Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	9,921	14,304
Consumer | Total Past Due Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total	431	302
Consumer | 30-59 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	833	1,087
Consumer | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	219	168
Consumer | 60-89 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	945	1,968
Consumer | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	$ 23	37
Consumer | Past Due 90+ Days Still Accruing | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total		132
Consumer | Past Due 90+ Days Still Accruing | Other consumer
Financing Receivable, Past Due [Line Items]
Total		$ 0

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	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual		$ 146,774	$ 54,057
End of Period Nonaccrual	$ 111,312	111,312	146,774
Nonaccrual With No Related Allowance	65,145	65,145	71,410
Past Due 90+ Days Still Accruing			503
Interest income recognized on nonaccrual	642	1,383	826
Commercial
Financing Receivable, Nonaccrual [Line Items]
Non - performing	1,700	1,700
Commercial | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual		101,070	25,356
End of Period Nonaccrual	54,797	54,797	101,070
Nonaccrual With No Related Allowance	47,730	47,730	60,401
Past Due 90+ Days Still Accruing			0
Interest income recognized on nonaccrual	493	556	22
Commercial | Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual		16,985	10,911
End of Period Nonaccrual	33,909	33,909	16,985
Nonaccrual With No Related Allowance	12,566	12,566	6,436
Past Due 90+ Days Still Accruing			0
Interest income recognized on nonaccrual	6	88	101
Commercial | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual		384	737
End of Period Nonaccrual	4,053	4,053	384
Nonaccrual With No Related Allowance	3,357	3,357	285
Past Due 90+ Days Still Accruing			0
Interest income recognized on nonaccrual	0	0	0
Commercial | Business banking
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual		17,122	9,863
End of Period Nonaccrual	10,221	10,221	17,122
Nonaccrual With No Related Allowance	1,492	1,492	3,890
Past Due 90+ Days Still Accruing			371
Interest income recognized on nonaccrual	57	333	275
Consumer | Consumer real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual		11,117	6,063
End of Period Nonaccrual	8,143	8,143	11,117
Nonaccrual With No Related Allowance	0	0	398
Past Due 90+ Days Still Accruing			132
Interest income recognized on nonaccrual	86	405	423
Consumer | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual		96	1,127
End of Period Nonaccrual	189	189	96
Nonaccrual With No Related Allowance	0	0	0
Past Due 90+ Days Still Accruing			0
Interest income recognized on nonaccrual	$ 0	$ 1	$ 4

Allowance for Credit Losses - C

Allowance for Credit Losses - Collateral Dependent Loans by Class of Loan (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	$ 6,970,087	$ 7,225,860
Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	59,049	108,525
Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	15,162	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	21,730	689
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	5,423,964	5,673,707
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	2,702,780	2,791,947
Commercial | Commercial real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	51,006	100,450
Commercial | Commercial real estate | Business Assets
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	1,478,198	1,559,552
Commercial | Commercial and industrial | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	272	1,040
Commercial | Commercial and industrial | Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	13,738	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	21,730	0
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	485,924	466,077
Commercial | Commercial construction | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	6,057	3,552
Commercial | Commercial construction | Business Assets
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	1,100,125	1,160,067
Commercial | Business banking | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,714	3,085
Commercial | Business banking | Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,424	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
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,546,123	1,552,153
Consumer | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		303,900
Consumer | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,105,478	1,167,332
Consumer | Consumer real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	0	398
Consumer | Consumer real estate | Business Assets
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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 109,636	$ 114,609	$ 117,612	$ 62,224
Provision for credit losses on loans	2,302	19,302	7,612	123,564
Charge-offs	(4,207)	(13,667)	(19,477)	(93,416)
Recoveries	616	754	2,601	1,274
Net (Charge-offs)/Recoveries	(3,591)	(12,913)	(16,876)	(92,142)
Balance at End of Period	$ 108,348	$ 120,998	$ 108,348	$ 120,998
Accounting Standards Update [Extensible List]	ASU No. 2016-13	ASU No. 2016-13	ASU No. 2016-13	ASU No. 2016-13
Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 63,186	$ 57,730	$ 65,656	$ 30,577
Provision for credit losses on loans	(7,856)	23,839	(2,922)	52,185
Charge-offs	(3,661)	(10,187)	(12,030)	(16,229)
Recoveries	1	172	966	211
Net (Charge-offs)/Recoveries	(3,660)	(10,015)	(11,064)	(16,018)
Balance at End of Period	51,670	71,554	51,670	71,554
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	14,426	19,164	16,100	15,681
Provision for credit losses on loans	11,599	(4,155)	14,552	62,949
Charge-offs	(2)	(1,196)	(4,777)	(72,692)
Recoveries	216	398	364	420
Net (Charge-offs)/Recoveries	214	(798)	(4,413)	(72,272)
Balance at End of Period	26,239	14,211	26,239	14,211
Commercial | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	5,905	8,874	7,239	7,900
Provision for credit losses on loans	1,391	(1,617)	54	2,712
Charge-offs	(56)	0	(56)	0
Recoveries	2	1	5	22
Net (Charge-offs)/Recoveries	(54)	1	(51)	22
Balance at End of Period	7,242	7,258	7,242	7,258
Commercial | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	14,756	14,404	15,917	0
Provision for credit losses on loans	(2,689)	2,072	(2,736)	4,197
Charge-offs	(167)	(1,748)	(1,494)	(2,469)
Recoveries	241	64	454	166
Net (Charge-offs)/Recoveries	74	(1,684)	(1,040)	(2,303)
Balance at End of Period	12,141	14,792	12,141	14,792
Consumer | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	8,647	11,585	10,014	6,337
Provision for credit losses on loans	(80)	(797)	(1,335)	32
Charge-offs	(76)	(252)	(422)	(470)
Recoveries	33	41	267	153
Net (Charge-offs)/Recoveries	(43)	(211)	(155)	(317)
Balance at End of Period	8,524	10,577	8,524	10,577
Consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,717	2,852	2,686	1,729
Provision for credit losses on loans	(63)	(40)	(1)	1,489
Charge-offs	(245)	(284)	(698)	(1,556)
Recoveries	123	78	545	302
Net (Charge-offs)/Recoveries	(122)	(206)	(153)	(1,254)
Balance at End of Period	$ 2,532	$ 2,606	$ 2,532	2,606
Impact of new accounting standard
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				27,352
Impact of new accounting standard | Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				4,810
Impact of new accounting standard | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				7,853
Impact of new accounting standard | Commercial | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(3,376)
Impact of new accounting standard | Commercial | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				12,898
Impact of new accounting standard | Consumer | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				4,525
Impact of new accounting standard | Consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 642

Allowance for Credit Losses - N

Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss	$ 108,348	$ 120,998	$ 108,348	$ 120,998	$ 109,636	$ 117,612	$ 114,609		$ 62,224
Provision for credit losses on loans	2,302	19,302	7,612	123,564
Provision for credit losses	1,085	(1,816)	1,476	727
COVID-19
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, credit loss, expense (reversal), period increase (decrease)	14,100	17,500	115,600	124,300
Provision for credit losses on loans	3,400		8,700
Provision for credit losses	1,100		$ 1,500
Forecast period			2 years
Commercial and industrial | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss	26,239	14,211	$ 26,239	14,211	$ 14,426	$ 16,100	$ 19,164		15,681
Provision for credit losses on loans	$ 11,599	$ (4,155)	$ 14,552	$ 62,949
Impact of new accounting standard
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss									27,352
Impact of new accounting standard | ASU No. 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss								$ 27,400
Impact of new accounting standard | S&T legacy loans | ASU No. 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss								8,200
Impact of new accounting standard | Commercial and industrial | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss									$ 7,853
Impact of new accounting standard | Commercial and industrial | Commercial | ASU No. 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss								9,900
Impact of new accounting standard | DNB | ASU No. 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss								$ 9,300

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Narrative (Details)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Period for commitments	60 days

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Assets
Derivatives (included in Other Assets)
Fair value	$ 42,177	$ 78,319
Other Assets | Interest rate swap contracts—commercial loans
Derivatives (included in Other Assets)
Fair value	42,177	78,319
Notional amount	998,385	983,638
Collateral posted	0	0
Other Assets | Interest rate lock commitments—mortgage loans
Derivatives (included in Other Assets)
Fair value	812	2,900
Notional amount	22,674	51,053
Other Assets | Forward sale contracts—mortgage loans
Derivatives (included in Other Assets)
Fair value	101	0
Notional amount	18,915	0
Other Liabilities
Derivatives (included in Other Liabilities)
Fair value	42,554	79,033
Other Liabilities | Interest rate swap contracts—commercial loans
Derivatives (included in Other Liabilities)
Fair value	42,554	79,033
Notional amount	998,385	983,638
Collateral posted	43,190	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_5

Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Assets
Derivatives (included in Other Assets)
Gross amounts recognized	$ 43,746	$ 82,655
Gross amounts offset	(1,569)	(4,336)
Net Amounts Presented in the Consolidated Balance Sheets	42,177	78,319
Gross amounts not offset	0	0
Net Amount	42,177	78,319
Other Liabilities
Derivatives (included in Other Liabilities)
Gross amounts recognized	44,170	82,626
Gross amounts offset	(1,616)	(3,593)
Net Amounts Presented in the Consolidated Balance Sheets	42,554	79,033
Gross amounts not offset	(43,190)	(77,930)
Net Amount	$ (636)	$ 1,103

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	$ (111)	$ (307)	$ (1,265)	$ 1,941
Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	22	(537)	337	(485)
Interest rate lock commitments—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	192	86	712	2,877
Forward sale contracts—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	$ (325)	$ 144	$ (2,314)	$ (451)

Commitments and Contingencies -

Commitments and Contingencies - Commitments and Letters of Credit (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Commitments and letters of credit	$ 2,590,791	$ 2,274,847
Commitments to extend credit
Other Commitments [Line Items]
Commitments and letters of credit	2,500,541	2,185,752
Standby letters of credit
Other Commitments [Line Items]
Commitments and letters of credit	$ 90,250	$ 89,095

Commitments and Contingencies_2

Commitments and Contingencies - Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 4,858	$ 7,004	$ 4,467	$ 3,112
Provision for credit losses	1,085	(1,816)	1,476	727
Balance at end of period	$ 5,943	$ 5,188	$ 5,943	$ 5,188
Accounting Standards Update [Extensible List]	ASU No. 2016-13	ASU No. 2016-13	ASU No. 2016-13	ASU No. 2016-13
Impact of adopting ASU 2016-13
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 0	$ 0	$ 0	$ 1,349
Balance after adoption of ASU 2016-13
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 4,858	$ 7,004	$ 4,467	$ 4,461

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount	$ (5,891)	$ 281	$ (12,714)	$ 26,833
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit	1,257	(60)	2,714	(5,710)
Net of Tax Amount
Other Comprehensive (Loss)/Income, Net of Tax Amount	(4,634)	221	(10,000)	21,123
Pension settlement charge	400		1,300
Accumulated Net Investment Gain (Loss) on Debt Securities Available-for-sale
Pre-Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale	(5,676)	(882)	(15,065)	24,883
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income			0	(142)
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on debt securities available-for-sale	1,211	188	3,215	(5,294)
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income			0	30
Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale	(4,465)	(694)	(11,850)	19,589
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income			0	(112)
Adjustment to Funded Status of Employee Benefit Plans
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount	(215)	1,163	2,351	2,092
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit	46	(248)	(501)	(446)
Net of Tax Amount
Other Comprehensive (Loss)/Income, Net of Tax Amount	$ (169)	$ 915	$ 1,850	$ 1,646

Employee Benefits - Narrative (

Employee Benefits - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service costs included in net periodic pension expense			$ 0
Expected long-term rate of return on plan assets			2.42%	3.45%
Settlement charge	$ 370,000	$ 671,000	$ 1,296,000	$ 671,000
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	90.00%		90.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	10.00%		10.00%

Employee Benefits - Components

Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of Net Periodic Pension Cost
Interest cost on projected benefit obligation	$ 721	$ 905	$ 2,221	$ 2,686
Expected return on plan assets	(668)	(970)	(2,029)	(2,913)
Net amortization	246	411	792	1,180
Settlement Charge	370	671	1,296	671
Net Periodic Pension Expense	$ 669	$ 1,017	$ 2,280	$ 1,624

Share Repurchase Plan (Details)

Share Repurchase Plan (Details) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Mar. 15, 2021
Equity, Class of Treasury Stock [Line Items]
Repurchased common shares (in shares)			411,430
Cost to repurchase common shares			$ 12,559,000
New Share Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 50,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 37,400,000	$ 37,400,000
Repurchased common shares (in shares)	0	0		411,430
Cost to repurchase common shares				$ 12,600,000
Cost to repurchase common shares (in dollars per share)				$ 30.52