S&T Bancorp (STBA) 10-Q 2 Nov 23 2023 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
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		38,234,797
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000719220
Current Fiscal Year End Date	--12-31

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks, including interest-bearing deposits of $163,117 and $138,149 at September 30, 2023 and December 31, 2022	$ 238,453	$ 210,009
Securities available for sale, at fair value	955,262	1,002,778
Loans held for sale	257	16
Portfolio loans, net of unearned income	7,515,918	7,183,969
Allowance for credit losses	(108,206)	(101,340)
Portfolio loans, net	7,407,712	7,082,629
Bank owned life insurance	84,724	85,185
Premises and equipment, net	49,522	49,285
Federal Home Loan Bank and other restricted stock, at cost	38,576	23,035
Goodwill	373,424	373,424
Other intangible assets, net	4,379	5,378
Other assets	313,768	278,828
Total Assets	9,466,077	9,110,567
Deposits:
Noninterest-bearing demand	2,276,009	2,588,692
Interest-bearing demand	868,624	846,653
Money market	1,615,445	1,731,521
Savings	974,940	1,118,511
Certificates of deposit	1,487,879	934,593
Total Deposits	7,222,897	7,219,970
Short-term borrowings	630,000	370,000
Long-term borrowings	39,396	14,741
Junior subordinated debt securities	49,343	54,453
Other liabilities	300,909	266,744
Total Liabilities	8,242,545	7,925,908
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—41,449,444 shares at September 30, 2023 and December 31, 2022 Outstanding—38,244,309 shares at September 30, 2023 and 38,999,733 shares at December 31, 2022	103,623	103,623
Additional paid-in capital	407,976	406,283
Retained earnings	935,162	863,948
Accumulated other comprehensive loss	(125,636)	(112,125)
Treasury stock — 3,205,135 shares at September 30, 2023 and 2,449,711 shares at December 31, 2022, at cost	(97,593)	(77,070)
Total Shareholders’ Equity	1,223,532	1,184,659
Total Liabilities and Shareholders’ Equity	$ 9,466,077	$ 9,110,567

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks, interest-bearing amounts	$ 163,117	$ 138,149
SHAREHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	41,449,444	41,449,444
Common stock, outstanding (in shares)	38,244,309	38,999,733
Treasury stock (in shares)	3,205,135	2,449,711

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 114,258	$ 83,035	$ 325,681	$ 218,646
Investment Securities:
Taxable	7,857	6,305	23,120	17,236
Tax-exempt	213	380	642	1,346
Dividends	631	115	1,752	315
Total Interest and Dividend Income	122,959	89,835	351,195	237,543
INTEREST EXPENSE
Deposits	24,910	5,197	59,915	8,840
Borrowings, junior subordinated debt securities and other	10,662	840	26,979	1,978
Total Interest Expense	35,572	6,037	86,894	10,818
NET INTEREST INCOME	87,387	83,798	264,301	226,725
Provision for credit losses	5,498	2,498	16,949	5,190
Net Interest Income After Provision for Credit Losses	81,889	81,300	247,352	221,535
NONINTEREST INCOME
Net gain on sale of securities	0	198	0	198
Mortgage banking	294	425	884	1,906
Other	135	1,824	3,771	3,736
Total Noninterest Income	12,182	14,760	39,563	42,616
NONINTEREST EXPENSE
Salaries and employee benefits	27,521	26,700	80,513	75,223
Data processing and information technology	4,479	4,220	12,914	12,759
Occupancy	3,671	3,490	11,216	11,006
Furniture, equipment and software	3,125	2,915	9,178	8,631
Professional services and legal	1,965	1,851	5,855	6,180
Marketing	1,741	1,367	5,053	4,252
Other taxes	1,831	1,559	4,943	4,778
FDIC insurance	1,029	598	3,073	2,417
Other	7,441	6,933	21,390	20,225
Total Noninterest Expense	52,803	49,633	154,135	145,471
Income Before Taxes	41,268	46,427	132,780	118,680
Income tax expense	7,800	9,178	25,046	23,430
Net Income	$ 33,468	$ 37,249	$ 107,734	$ 95,250
Earnings per share—basic (in dollars per share)	$ 0.88	$ 0.95	$ 2.79	$ 2.43
Earnings per share—diluted (in dollars per share)	0.87	0.95	2.78	2.43
Dividends declared per share (in dollars per share)	$ 0.32	$ 0.30	$ 0.96	$ 0.89
Comprehensive Income (Loss)	$ 21,875	$ (10,547)	$ 94,223	$ (12,627)
Debit and credit card
NONINTEREST INCOME
Revenues from contract with customers	4,690	4,768	13,708	14,587
Service charges on deposit accounts
NONINTEREST INCOME
Revenues from contract with customers	4,060	4,333	12,064	12,488
Wealth management
NONINTEREST INCOME
Revenues from contract with customers	$ 3,003	$ 3,212	$ 9,136	$ 9,701

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Impact of adopting ASU 2022-02	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Impact of adopting ASU 2022-02	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning Balance at Dec. 31, 2021	$ 1,206,454		$ 103,623	$ 403,095	$ 773,659		$ (7,090)	$ (66,833)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	95,250				95,250
Other comprehensive income (loss), net of tax	(107,877)						(107,877)
Cash dividends declared	(34,922)				(34,922)
Treasury stock issued for restricted stock awards	0				(135)			135
Forfeitures of restricted stock awards	(498)				1,832			(2,330)
Repurchase of S&T Stock	(7,637)							(7,637)
Recognition of restricted stock compensation expense	2,411			2,411
Ending Balance at Sep. 30, 2022	1,153,181		103,623	405,506	835,684		(114,967)	(76,665)
Beginning Balance at Dec. 31, 2021	1,206,454		103,623	403,095	773,659		(7,090)	(66,833)
Ending Balance at Dec. 31, 2022	$ 1,184,659	$ (447)	103,623	406,283	863,948	$ (447)	(112,125)	(77,070)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2022-02
Beginning Balance at Jun. 30, 2022	$ 1,178,358		103,623	404,841	809,644		(67,171)	(72,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	37,249				37,249
Other comprehensive income (loss), net of tax	(47,796)						(47,796)
Cash dividends declared	(11,747)				(11,747)
Forfeitures of restricted stock awards	(64)				538			(602)
Repurchase of S&T Stock	(3,484)							(3,484)
Recognition of restricted stock compensation expense	665			665
Ending Balance at Sep. 30, 2022	1,153,181		103,623	405,506	835,684		(114,967)	(76,665)
Beginning Balance at Dec. 31, 2022	1,184,659	$ (447)	103,623	406,283	863,948	$ (447)	(112,125)	(77,070)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	107,734				107,734
Other comprehensive income (loss), net of tax	(13,511)						(13,511)
Cash dividends declared	(37,190)				(37,190)
Treasury stock issued for restricted stock awards	0			(1,113)				1,113
Forfeitures of restricted stock awards	(521)				1,117			(1,638)
Repurchase of S&T Stock	(19,998)							(19,998)
Recognition of restricted stock compensation expense	2,806			2,806
Ending Balance at Sep. 30, 2023	1,223,532		103,623	407,976	935,162		(125,636)	(97,593)
Beginning Balance at Jun. 30, 2023	1,212,853		103,623	406,969	913,974		(114,043)	(97,670)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,468				33,468
Other comprehensive income (loss), net of tax	(11,593)						(11,593)
Cash dividends declared	(12,280)				(12,280)
Treasury stock issued for restricted stock awards	0			(116)				116
Forfeitures of restricted stock awards	(39)							(39)
Recognition of restricted stock compensation expense	1,123			1,123
Ending Balance at Sep. 30, 2023	$ 1,223,532		$ 103,623	$ 407,976	$ 935,162		$ (125,636)	$ (97,593)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.32	$ 0.30	$ 0.96	$ 0.89
Treasury stock issued for restricted stock awards (in shares)	3,795		35,836	4,250
Forfeitures of restricted stock awards (in shares)	1,404	18,943	51,834	74,168
Repurchase of S&T Stock (in shares)	0	117,283	739,426	268,503

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Statement of Cash Flows [Abstract]
Net Cash Provided by Operating Activities	$ 132,070	$ 205,236
INVESTING ACTIVITIES
Purchases of securities	(65,148)	(353,088)
Proceeds from maturities, prepayments and calls of securities	95,967	117,377
Proceeds from sales of securities	0	30,490
(Purchases) redemption of Federal Home Loan Bank stock	(15,541)	(1,381)
Net increase in loans	(348,844)	(101,919)
Proceeds from sale of portfolio loans	8,333	4,326
Proceeds from sale of other real estate owned	30	0
Purchases of premises and equipment	(4,921)	(2,877)
Proceeds from the sale of premises and equipment	698	251
Proceeds from life insurance settlement	597	214
Net Cash Used in Investing Activities	(328,829)	(306,607)
FINANCING ACTIVITIES
Net decrease in demand, money market and savings deposits	(550,359)	(450,642)
Net increase (decrease) in certificates of deposit	553,333	(135,227)
Net increase (decrease) in short-term borrowings	260,000	(49,491)
Proceeds from long-term borrowings	25,000	0
Repayments on long-term borrowings	(5,346)	(7,577)
Repurchase of shares for taxes on restricted stock	(521)	(498)
Cash dividends paid to common shareholders	(37,096)	(34,869)
Repurchase of common stock	(19,808)	(7,637)
Net Cash Provided by (Used in) Financing Activities	225,203	(685,941)
Net increase (decrease) in cash and due from banks	28,444	(787,312)
Cash and due from banks at beginning of period	210,009	922,215
Cash and Due From Banks at End of Period	238,453	134,903
Supplemental Disclosures
Right of use assets obtained in exchange for lease obligations	1,846	0
Cash paid for interest	74,939	10,152
Cash paid for income taxes, net of refunds	27,727	19,725
Transfers of loans to other real estate owned	$ 88	$ 23

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2023
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, 2022, filed with the Securities and Exchange Commission, or SEC, on February 24, 2023 (2022 Form 10-K). 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 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 Updated 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 provided 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 provided optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts and other transactions affected by the anticipated transition away from the London Inter-Bank Offered Rate, or LIBOR, toward new interest rate benchmarks. The optional guidance generally allowed 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 were effective as of March 12, 2020 through December 31, 2022. In January 2021, the FASB issued ASU 2021-01, Reference Rate Addendum (Topic 848) which clarified that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The guidance was effective for all entities as of March 12, 2020 through December 31, 2022. In December 2022, the FASB issued ASU No 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848. The amendments in this ASU defer the sunset date for applying the reference rate reform relief by two years to December 31, 2024. We adopted ASU 2020-04 and ASU 2021-01 on January 1, 2022 and ASU 2022-06 upon issuance. We utilized the LIBOR transition relief as contract modifications were made during the course of the reference rate reform transition period. ASU 2020-04, ASU 2021-01 and ASU 2022-06 did not have a material impact on our consolidated financial statements. Financial Instruments Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued ASU 2022-02, Financial Instruments Credit Losses (Topic 326): Troubled Debt Restructuring and Vintage Disclosures. The guidance eliminates the “once a TDR, always a TDR” requirement for loan disclosures and requires disclosures about the performance of modified loans to borrowers experiencing financial difficulty in the 12 months following the modification. The amendments eliminate the recognition and measurement guidance related to TDRs for creditors that have adopted ASC 326 Financial Instruments - Credit Losses. We adopted ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, on January 1, 2020. ASC 326 requires the recognition of lifetime expected credit losses when a loan is originated or acquired, so the effect of credit losses that occur in loans modified in TDRs is already included in the allowance for credit losses. ASU 2022-02 requires a creditor to apply the loan refinancing and restructuring guidance in ASC 310-20 (consistent with the accounting for other loan modifications) to determine whether a modification results in a new loan or a continuation of an existing loan. It also requires enhanced disclosures for modifications in the form of interest rate reductions, principal forgiveness, other-than-insignificant payment delays or term extensions (or combinations thereof) of loans made to borrowers experiencing financial difficulty. Disclosures are required regardless of whether a modification of a loan to a borrower experiencing financial difficulty results in a new loan. The objective of the disclosures is to provide information about the type and magnitude of modifications and the degree of their success in mitigating potential credit losses. The amendments in this ASU were effective for fiscal years beginning after December 15, 2022, and interim periods therein. We adopted ASU 2022-02, as of January 1, 2023, using a modified retrospective transition approach. Results for reporting periods beginning after January 1, 2023 are presented under ASU 2022-02 while prior period amounts continue to be reported in accordance with previously applicable GAAP. Under the previously applicable accounting guidance, commercial TDRs were individually assessed to determine if a specific reserve was required in the allowance for credit losses, or ACL. The elimination of TDRs resulted in these loans being included in homogenous pools. The adoption of this ASU resulted in a day one cumulative effective adjustment of $0.6 million which increased our ACL and decreased retained earnings. Refer to Note 5 Loans and Allowance for Credit Losses for additional disclosures related to modifications of loans to borrowers experiencing financial difficulty as well as gross charge-off vintage disclosures. Accounting Standards Updates Issued But Not Yet Adopted Investments Equity Method and Joint Ventures (Topic 323) Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method In March 2023, the FASB issued ASU 2023-02, Investments Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method to allow reporting entities to consistently account for equity investments made primarily for the purpose of receiving income tax credits and other income tax benefits. If certain conditions are met, a reporting entity may elect to account for its tax equity investments by using the proportional amortization method regardless of the program from which it receives income tax credits, instead of only low-income-housing tax credit (“LIHTC”) structures. This amendment also eliminates certain LIHTC specific guidance aligning the accounting with other equity investments in tax credit structures. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. We are evaluating the accounting and disclosure requirements of ASU 2023-02 and do not expect them to have a material effect on our consolidated financial statements.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2023
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. The two-class method was used to determine earnings per share for the three and nine months ended September 30, 2023 and 2022. 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) 2023 2022 2023 2022 Numerator for Earnings per Share—Basic and Diluted: Net income $ 33,468 $ 37,249 $ 107,734 $ 95,250 Less: Income allocated to participating shares 32 98 138 223 Net Income Allocated to Shareholders $ 33,436 $ 37,151 $ 107,596 $ 95,027 Denominator for Earnings per Share—Basic: Weighted Average Shares Outstanding—Basic 38,174,804 38,937,771 38,514,617 39,030,325 Denominator for Earnings per Share—Two-Class Method—Diluted: Weighted Average Shares Outstanding—Basic 38,174,804 38,937,771 38,514,617 39,030,325 Add: Average participating shares outstanding 161,212 37,374 154,347 18,826 Denominator for Two-Class Method—Diluted 38,336,016 38,975,145 38,668,964 39,049,151 Earnings per share—basic $ 0.88 $ 0.95 $ 2.79 $ 2.43 Earnings per share—diluted $ 0.87 $ 0.95 $ 2.78 $ 2.43 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 721 655 231 1,027

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
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 financial instruments 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. There have been no changes in our valuation methodologies during the three and nine months ended September 30, 2023. Refer to Note 1 Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in our 2022 Form 10-K for more information on the valuation methodologies that we use for financial instruments recorded at fair value on a recurring or nonrecurring basis. 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 the dates presented: September 30, 2023 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ 130,037 $ — $ — $ 130,037 Obligations of U.S. government corporations and agencies — 42,049 — 42,049 Collateralized mortgage obligations of U.S. government corporations and agencies — 429,978 — 429,978 Residential mortgage-backed securities of U.S. government corporations and agencies — 36,886 — 36,886 Commercial mortgage-backed securities of U.S. government corporations and agencies — 286,107 — 286,107 Obligations of states and political subdivisions — 29,210 — 29,210 Total Available-for-Sale Debt Securities 130,037 824,230 — 954,267 Equity securities 923 72 — 995 Total Securities Available for Sale 130,960 824,302 — 955,262 Securities held in a deferred compensation plan 8,289 — — 8,289 Derivative financial assets: Interest rate swaps - commercial loans — 93,601 — 93,601 Total Assets $ 139,249 $ 917,903 $ — $ 1,057,152 LIABILITIES Derivative financial liabilities: Interest rate swaps - commercial loans $ — $ 94,438 $ — $ 94,438 Interest rate swaps - cash flow hedge — 25,668 — 25,668 Total Liabilities $ — $ 120,106 $ — $ 120,106 December 31, 2022 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ 131,695 $ — $ — $ 131,695 Obligations of U.S. government corporations and agencies — 41,811 — 41,811 Collateralized mortgage obligations of U.S. government corporations and agencies — 428,407 — 428,407 Residential mortgage-backed securities of U.S. government corporations and agencies — 41,587 — 41,587 Commercial mortgage-backed securities of U.S. government corporations and agencies — 327,313 — 327,313 Corporate obligations — 500 — 500 Obligations of states and political subdivisions — 30,471 — 30,471 Total Available-for-Sale Debt Securities 131,695 870,089 — 1,001,784 Equity securities 952 42 — 994 Total Securities Available for Sale 132,647 870,131 — 1,002,778 Securities held in a deferred compensation plan 8,087 — — 8,087 Derivative financial assets: Interest rate swaps - commercial loans — 83,449 — 83,449 Interest rate lock commitments — — 5 5 Forward sale contracts - mortgage loans — — 2 2 Total Assets $ 140,734 $ 953,580 $ 7 $ 1,094,321 LIABILITIES Derivative financial liabilities: Interest rate swaps - commercial loans $ — $ 83,449 $ — $ 83,449 Interest rate swaps - cash flow hedge — 21,368 — 21,368 Total Liabilities $ — $ 104,817 $ — $ 104,817 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 consolidated financial statements. There were no liabilities measured at fair value on a nonrecurring basis at either September 30, 2023 or December 31, 2022. There were no Level 3 assets measured at fair value on a nonrecurring basis as of September 30, 2023. At December 31, 2022, there was one Level 3 OREO property measured at fair value for $3.1 million. The following tables present the carrying values and fair values of our financial instruments at the dates presented: Carrying Value (1) Fair Value Measurements at September 30, 2023 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 238,453 $ 238,453 $ 238,453 $ — $ — Securities available for sale 955,262 955,262 130,960 824,302 Loans held for sale 257 257 — 257 — Portfolio loans, net 7,407,712 7,059,741 — — 7,059,741 Collateral receivable 10,506 10,506 10,506 — — Securities held in a deferred compensation plan 8,289 8,289 8,289 — — Mortgage servicing rights 6,534 9,411 — — 9,411 Interest rate swaps - commercial loans 93,601 93,601 — 93,601 — LIABILITIES Deposits $ 7,222,897 $ 7,205,014 $ 5,735,018 $ 1,469,996 $ — Collateral payable 77,049 77,049 77,049 — — Short-term borrowings 630,000 630,000 — 630,000 — Long-term borrowings 39,396 38,983 — 38,983 — Junior subordinated debt securities 49,343 49,343 — 49,343 — Interest rate swaps - commercial loans 94,438 94,438 — 94,438 — Interest rate swaps - cash flow hedge 25,668 25,668 — 25,668 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2022 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 210,009 $ 210,009 $ 210,009 $ — $ — Securities available for sale 1,002,778 1,002,778 132,647 870,131 — Loans held for sale 16 16 — 16 — Portfolio loans, net 7,082,629 6,815,167 — — 6,815,167 Collateral receivable 6,307 6,307 6,307 — — Securities held in a deferred compensation plan 8,087 8,087 8,087 — — Mortgage servicing rights 7,147 9,994 — — 9,994 Interest rate swaps - commercial loans 83,449 83,449 — 83,449 — Interest rate lock commitments 5 5 — — 5 Forward sale contracts 2 2 — — 2 LIABILITIES Deposits $ 7,219,970 $ 7,194,225 $ 6,285,377 $ 908,848 $ — Collateral payable 65,065 65,065 65,065 — — Short-term borrowings 370,000 370,000 — 370,000 — Long-term borrowings 14,741 14,174 — 14,174 — Junior subordinated debt securities 54,453 54,453 — 54,453 — Interest rate swaps - commercial loans 83,449 83,449 — 83,449 — Interest rate swaps - cash flow hedge 21,368 21,368 — 21,368 — (1) As reported in the Consolidated Balance Sheets

Securities

Securities	9 Months Ended
	Sep. 30, 2023
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, 2023 December 31, 2022 Debt securities $ 954,267 $ 1,001,784 Equity securities 995 994 Total Securities Available for Sale $ 955,262 $ 1,002,778 The following tables present the amortized cost and fair value of available-for-sale debt securities as of the dates presented: September 30, 2023 December 31, 2022 (dollars in thousands) Amortized Gross Gross Fair Amortized Gross Unrealized Gains Gross Fair U.S. Treasury securities $ 144,575 $ — $ (14,538) $ 130,037 $ 145,416 $ — $ (13,721) $ 131,695 Obligations of U.S. government corporations and agencies 43,377 — (1,328) 42,049 43,479 — (1,668) 41,811 Collateralized mortgage obligations of U.S. government corporations and agencies 493,359 — (63,381) 429,978 482,039 203 (53,835) 428,407 Residential mortgage-backed securities of U.S. government corporations and agencies 45,802 — (8,916) 36,886 49,418 3 (7,834) 41,587 Commercial mortgage-backed securities of U.S. government corporations and agencies 312,191 — (26,084) 286,107 352,465 — (25,152) 327,313 Corporate obligations — — — — 500 — — 500 Obligations of states and political subdivisions 30,391 — (1,181) 29,210 30,788 55 (372) 30,471 Total Available-for-Sale Debt Securities (1) $ 1,069,695 $ — $ (115,428) $ 954,267 $ 1,104,105 $ 261 $ (102,582) $ 1,001,784 (1) Excludes interest receivable of $3.4 million at September 30, 2023 and $3.7 million at December 31, 2022. 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, 2023 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 1 $ 9,895 $ (203) 13 $ 120,142 $ (14,335) 14 $ 130,037 $ (14,538) Obligations of U.S. government corporations and agencies — — — 6 42,049 (1,328) 6 42,049 (1,328) Collateralized mortgage obligations of U.S. government corporations and agencies 8 78,608 (2,402) 57 351,370 (60,979) 65 429,978 (63,381) Residential mortgage-backed securities of U.S. government corporations and agencies 12 319 (7) 14 36,567 (8,909) 26 36,886 (8,916) Commercial mortgage-backed securities of U.S. government corporations and agencies 2 18,525 (591) 31 267,582 (25,493) 33 286,107 (26,084) Obligations of states and political subdivisions 5 29,210 (1,181) — — — 5 29,210 (1,181) Total 28 $ 136,557 $ (4,384) 121 $ 817,710 $ (111,044) 149 $ 954,267 $ (115,428) December 31, 2022 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 6 $ 57,057 $ (3,363) 8 $ 74,638 $ (10,358) 14 $ 131,695 $ (13,721) Obligations of U.S. government corporations and agencies 6 41,811 (1,668) — — — 6 41,811 (1,668) Collateralized mortgage obligations of U.S. government corporations and agencies 47 296,509 (28,153) 13 112,902 (25,682) 60 409,411 (53,835) Residential mortgage-backed securities of U.S. government corporations and agencies 25 7,143 (589) 3 34,223 (7,245) 28 41,366 (7,834) Commercial mortgage-backed securities of U.S. government corporations and agencies 30 241,009 (11,975) 7 86,304 (13,177) 37 327,313 (25,152) Obligations of states and political subdivisions 2 20,127 (372) — — — 2 20,127 (372) Total 116 $ 663,656 $ (46,120) 31 $ 308,067 $ (56,462) 147 $ 971,723 $ (102,582) We evaluate securities with unrealized losses quarterly to determine if the decline in fair value has resulted from credit impairment or other factors. We do not believe any individual unrealized loss as of September 30, 2023 represents a credit impairment. There were 149 debt securities in an unrealized loss position at September 30, 2023 and 147 debt securities in an unrealized loss position at December 31, 2022. The unrealized losses on debt securities were primarily attributable to changes in interest rates and not related to the credit quality of the issuers. All debt securities were determined to be investment grade and paying principal and interest according to the contractual terms of the security. We do not intend to sell, and it is more likely than not that we will not be required to sell, the securities in an unrealized loss position before recovery of their amortized cost. 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, 2023 December 31, 2022 (dollars in thousands) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Losses Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Losses Total unrealized gains (losses) on available-for-sale debt securities $ — $ (115,428) $ (115,428) $ 261 $ (102,582) $ (102,321) Income tax (expense) benefit — 24,567 24,567 (56) 21,915 21,859 Net Unrealized Gains (Losses), Net of Tax Included in Accumulated Other Comprehensive Income (Loss) $ — $ (90,861) $ (90,861) $ 205 $ (80,667) $ (80,462) The amortized cost and fair value of available-for-sale debt securities at September 30, 2023 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, 2023 (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 $ 28,010 $ 27,485 Due after one year through five years 162,599 147,194 Due after five years through ten years 16,357 15,835 Due after ten years 11,377 10,782 Available-for-Sale Debt Securities With Fixed Maturities 218,343 201,296 Debt Securities without a single maturity date Collateralized mortgage obligations of U.S. government corporations and agencies 493,359 429,978 Residential mortgage-backed securities of U.S. government corporations and agencies 45,802 36,886 Commercial mortgage-backed securities of U.S. government corporations and agencies 312,191 286,107 Total Available-for-Sale Debt Securities $ 1,069,695 $ 954,267 Debt securities are pledged in order to meet various regulatory and legal requirements. Restricted pledged securities had a carrying value of $18.3 million at September 30, 2023 and $17.9 million at December 31, 2022. Unrestricted pledged securities had a carrying value of $213.2 million at September 30, 2023 and $251.5 million at December 31, 2022. Any changes to restricted pledged securities require approval of the pledge beneficiary. Approval is not required for unrestricted pledged securities.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
LOANS AND ALLOWANCE FOR CREDIT LOSSES	LOANS AND ALLOWANCE FOR CREDIT LOSSES Loans and Loans Held for Sale Loans are presented net of unearned income. Unearned income consisted of net deferred loan fees and costs of $7.1 million at September 30, 2023 and $7.5 million at December 31, 2022 and a discount related to purchase accounting fair value adjustments of $3.6 million at September 30, 2023 and $4.7 million at December 31, 2022. The following table summarizes the composition of originated and acquired loans as of the dates presented: (dollars in thousands) September 30, 2023 December 31, 2022 Commercial real estate $ 2,591,189 $ 2,538,839 Commercial and industrial 1,424,141 1,510,392 Commercial construction 372,839 381,963 Business banking 1,363,314 1,205,944 Consumer real estate 1,649,056 1,421,953 Other consumer 115,379 124,878 Total Portfolio Loans $ 7,515,918 $ 7,183,969 Loans held for sale 257 16 Total Loans (1) $ 7,516,175 $ 7,183,985 (1) Excludes interest receivable of $34.2 million at September 30, 2023 and $28.3 million at December 31, 2022. Interest receivable is included in other assets in the Consolidated Balance Sheets. Modifications to Borrowers Experiencing Financial Difficulty The following table presents the amortized cost of loans to borrowers experiencing financial difficulty by portfolio segment and type of modification during the periods presented: Three Months Ended September 30, 2023 (dollars in thousands) Term Extension Term Extension and Interest Rate Reduction Total % of Portfolio Segment Commercial real estate $ — $ — $ — — % Commercial industrial 6,347 — 6,347 0.45 % Commercial construction — — — — % Business banking — — — — % Consumer real estate — — — — % Total (1) $ 6,347 $ — $ 6,347 0.08 % (1) Excludes loans that were fully paid off or fully charged-off by period end. Nine Months Ended September 30, 2023 (dollars in thousands) Term Extension Term Extension and Interest Rate Reduction Total % of Portfolio Segment Commercial real estate $ 13,505 $ — $ 13,505 0.52 % Commercial industrial 6,892 — 6,892 0.48 % Commercial construction 1,610 — 1,610 0.43 % Business banking 658 — 658 0.05 % Consumer real estate 62 191 253 0.02 % Total (1) $ 22,727 $ 191 $ 22,918 0.30 % (1) Excludes loans that were fully paid off or fully charged-off by period end. The following table describes the effect of loan modifications made to borrowers experiencing financial difficulty during the periods presented: Three Months Ended September 30, 2023 Nine Months Ended September 30, 2023 Weighted-Average Weighted-Average Weighted-Average Weighted-Average Commercial real estate 0 — 7 — Commercial industrial 2 — 6 — Commercial construction 0 — 5 — Business banking 0 — 5 — Consumer real estate 0 — 168 2% We closely monitor the performance of the loans that are modified to borrowers experiencing financial difficulty to understand the effectiveness of the modification efforts. The following table presents the aging analysis of modifications to borrowers experiencing financial difficulty in the last 12 months as of the date presented: September 30, 2023 (dollars in thousands) Current 30-59 Days 60-89 Days 90+ Days Past Due Total Commercial real estate $ 13,505 $ — $ — $ — $ 13,505 Commercial and industrial 6,447 — — 445 6,892 Commercial construction — 1,610 — — 1,610 Business banking 658 — — — 658 Consumer real estate 191 — 62 — 253 Total $ 20,801 $ 1,610 $ 62 $ 445 $ 22,918 A payment default is defined as a loan having a payment past due 90 days or more after a modification took place. There were no loans that were modified within the last 12 months that had a payment default during the three and nine months ended September 30, 2023. Additionally, we had one commitment to lend an additional $0.2 million to borrowers experiencing financial difficulty that had a modification during the three and nine months ended September 30, 2023. The effect of modifications made to borrowers experiencing financial difficulty is already included in the ACL because of the measurement methodologies used to estimate the ACL, therefore, a change to the ACL is generally not recorded upon modification. If principal forgiveness is provided, that portion of the loan will be charged-off, resulting in a reduction of the amortized cost basis and a corresponding adjustment to the ACL. An assessment of whether the borrower is experiencing financial difficulty is made on the date of a modification. Troubled Debt Restructurings Prior to the adoption of ASU 2022-02, we evaluated all substandard commercial and consumer loans that had experienced a forbearance or modification of existing terms to determine if they should be designated as troubled debt restructurings, or TDRs. TDRs returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, was not in doubt and there was a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring. There was one $0.2 million TDR returned to accruing status during 2022. The following table summarizes TDRs as of the date presented: December 31, 2022 (dollars in thousands) Accruing Nonaccruing Total Commercial real estate $ — $ — $ — Commercial and industrial 626 — 626 Commercial construction 1,655 — 1,655 Business banking 438 1,087 1,525 Consumer real estate 6,168 1,798 7,966 Other consumer 4 9 13 Total $ 8,891 $ 2,894 $ 11,785 The following tables present the TDRs by portfolio segment and type of concession for the periods presented: Three Months Ended September 30, 2022 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 — — — — — — — — Commercial construction — — — — — — — — Business banking — — — — — — — — Consumer real estate 6 172 — — — — 172 173 Other consumer 1 9 — — — — 9 12 Total 7 $ 181 $ — $ — $ — $ — $ 181 $ 185 (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, 2022 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 — — — — — — — — Commercial construction — — — — — — — — Business banking — — — — — — — — Consumer real estate 21 1,204 — 862 — — 2,066 2,530 Other consumer 2 11 — — — — 11 15 Total 23 $ 1,215 $ — $ 862 $ — $ — $ 2,077 $ 2,545 (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. As of September 30, 2022, we had 16 commitments to lend an additional $0.4 million on TDRs. Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring took place that were restructured within the last 12 months prior to defaulting. There was one TDR totaling $0.1 million that defaulted during the three months ended September 30, 2022 and two TDRs totaling $0.2 million that defaulted during the nine months ended September 30, 2022. The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) September 30, 2023 December 31, 2022 Nonperforming Assets Nonaccrual Loans $ 12,677 $ 19,052 OREO 3,715 3,065 Total Nonperforming Assets $ 16,392 $ 22,117 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 these loans are 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 1-4 family residential mortgages, home equity loans and home equity lines of credit. 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 of credit. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values. Management monitors various credit quality indicators for the commercial, business banking and consumer loan portfolios, including changes in risk ratings, nonperforming status and delinquency on a monthly basis. We monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard. Our risk ratings are consistent with regulatory guidance and are as follows: Pass —The loan is currently performing and is of high quality. Special Mention —A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Substandard —A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Doubtful —Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions and values, highly questionable and improbable. The following tables present loan balances by year of origination and internally assigned risk rating for our portfolio segments as of the dates presented: September 30, 2023 Risk Rating (dollars in thousands) 2023 2022 2021 2020 2019 2018 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 221,775 $ 268,261 $ 416,345 $ 242,965 $ 377,358 $ 785,748 $ 35,469 $ — $ 2,347,921 Special mention — — 6,000 1,107 38,236 106,995 — — 152,338 Substandard — — — 1,267 10,776 78,887 — — 90,930 Doubtful — — — — — — — — — Total Commercial Real Estate 221,775 268,261 422,345 245,339 426,370 971,630 35,469 — 2,591,189 Year-to-date Gross Charge-offs — — — — — — — — — Commercial and Industrial Pass 143,170 234,153 199,719 56,549 53,214 173,188 478,363 — 1,338,356 Special mention — 651 11,698 1,689 — 8,461 15,359 — 37,858 Substandard — 254 13,476 — 6,059 2,691 25,447 — 47,927 Doubtful — — — — — — — — — Total Commercial and Industrial 143,170 235,058 224,893 58,238 59,273 184,340 519,169 — 1,424,141 Year-to-date Gross Charge-offs — — — — 3,412 11,808 3,033 — 18,253 Commercial Construction Pass 44,519 188,037 97,525 13,266 2,575 4,368 12,475 — 362,765 Special mention — — — — — — — — — Substandard — — — — 8,240 1,834 — — 10,074 Doubtful — — — — — — — — — Total Commercial Construction 44,519 188,037 97,525 13,266 10,815 6,202 12,475 — 372,839 Year-to-date Gross Charge-offs — — — — — — — — — Business Banking Pass 230,663 270,093 213,953 90,386 99,541 337,456 98,434 781 1,341,307 Special mention — — 263 227 — 3,307 37 179 4,013 Substandard — 17 2,513 554 3,220 10,706 114 870 17,994 Doubtful — — — — — — — — — Total Business Banking 230,663 270,110 216,729 91,167 102,761 351,469 98,585 1,830 1,363,314 Year-to-date Gross Charge-offs — 67 43 1 88 1,018 35 — 1,252 Consumer Real Estate Pass 225,529 326,499 149,042 101,799 67,478 192,173 553,737 22,393 1,638,650 Special mention — — — — — 116 — — 116 Substandard — 208 200 139 506 6,186 610 2,441 10,290 Doubtful — — — — — — — — — Total Consumer Real Estate 225,529 326,707 149,242 101,938 67,984 198,475 554,347 24,834 1,649,056 Year-to-date Gross Charge-offs — 1 — 5 1 43 75 99 224 Other Consumer Pass 10,284 13,136 7,503 3,483 1,523 728 75,803 2,703 115,163 Special mention — — — — — — — — — Substandard — — 26 4 21 149 — 16 216 Doubtful — — — — — — — — — Total Other Consumer 10,284 13,136 7,529 3,487 1,544 877 75,803 2,719 115,379 Year-to-date Gross Charge-offs 551 116 148 8 28 5 — 173 1,029 Pass 875,940 1,300,179 1,084,087 508,448 601,689 1,493,661 1,254,281 25,877 7,144,162 Special mention — 651 17,961 3,023 38,236 118,879 15,396 179 194,325 Substandard — 479 16,215 1,964 28,822 100,453 26,171 3,327 177,431 Doubtful — — — — — — — — — Total Loan Balance $ 875,940 $ 1,301,309 $ 1,118,263 $ 513,435 $ 668,747 $ 1,712,993 $ 1,295,848 $ 29,383 $ 7,515,918 Current Year-to-date Gross Charge-offs $ 551 $ 184 $ 191 $ 14 $ 3,529 $ 12,874 $ 3,143 $ 272 $ 20,758 December 31, 2022 Risk Rating (dollars in thousands) 2022 2021 2020 2019 2018 2017 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 292,732 $ 360,423 $ 267,743 $ 422,872 $ 227,006 $ 704,600 $ 21,666 $ — $ 2,297,042 Special mention — — — 13,187 20,090 101,112 — — 134,389 Substandard — — 1,306 13,434 14,845 77,823 — — 107,408 Doubtful — — — — — — — — — Total Commercial Real Estate 292,732 360,423 269,049 449,493 261,941 883,535 21,666 — 2,538,839 Commercial and Industrial Pass 253,324 264,012 88,544 63,190 62,874 138,250 559,777 — 1,429,971 Special mention — 25,436 — 5,103 1,885 7,132 19,280 — 58,836 Substandard 372 — — 5,705 1,152 1,891 12,465 — 21,585 Doubtful — — — — — — — — — Total Commercial and Industrial 253,696 289,448 88,544 73,998 65,911 147,273 591,522 — 1,510,392 Commercial Construction Pass 120,655 159,737 40,762 6,338 3,953 2,297 27,284 — 361,026 Special mention — 10,954 — 8,104 — — — — 19,058 Substandard — — — — — 1,879 — — 1,879 Doubtful — — — — — — — — — Total Commercial Construction 120,655 170,691 40,762 14,442 3,953 4,176 27,284 — 381,963 Business Banking Pass 287,520 233,499 87,926 107,819 80,549 276,843 104,354 645 1,179,155 Special mention — 157 146 — 2,790 3,945 793 95 7,926 Substandard 159 67 3,077 1,912 1,550 11,391 124 551 18,831 Doubtful — — — — — 32 — — 32 Total Business Banking 287,679 233,723 91,149 109,731 84,889 292,211 105,271 1,291 1,205,944 Consumer Real Estate Pass 296,900 148,790 91,477 74,155 30,658 191,228 552,994 21,547 1,407,749 Special mention — — — — — 882 — — 882 Substandard 48 213 136 428 1,373 8,059 655 2,410 13,322 Doubtful — — — — — — — — — Total Consumer Real Estate 296,948 149,003 91,613 74,583 32,031 200,169 553,649 23,957 1,421,953 Other Consumer Pass 20,046 10,819 5,427 3,242 1,013 724 82,125 1,404 124,800 Special mention — — — — — — — — — Substandard 8 — — 28 21 — — 21 78 Doubtful — — — — — — — — — Total Other Consumer 20,054 10,819 5,427 3,270 1,034 724 82,125 1,425 124,878 Pass 1,271,177 1,177,280 581,879 677,616 406,053 1,313,942 1,348,200 23,596 6,799,743 Special Mention — 36,547 146 26,394 24,765 113,071 20,073 95 221,091 Substandard 587 280 4,519 21,507 18,941 101,043 13,244 2,982 163,103 Doubtful — — — — — 32 — — 32 Total Loan Balance $ 1,271,764 $ 1,214,107 $ 586,544 $ 725,517 $ 449,759 $ 1,528,088 $ 1,381,517 $ 26,673 $ 7,183,969 We monitor the delinquent status of the commercial and consumer portfolios on a monthly basis. Loans are considered nonaccrual 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 nonaccrual loans. The following tables present loan balances by year of origination and accrual and nonaccrual status for our portfolio segments as of the dates presented: September 30, 2023 (dollars in thousands) 2023 2022 2021 2020 2019 2018 and Prior Revolving Revolving-Term Total Commercial Real Estate Accrual $ 221,775 $ 268,261 $ 422,345 $ 245,339 $ 426,370 $ 970,368 $ 35,469 $ — $ 2,589,927 Nonaccrual — — — — — 1,262 — — 1,262 Total Commercial Real Estate 221,775 268,261 422,345 245,339 426,370 971,630 35,469 — 2,591,189 Commercial and Industrial Accrual 143,170 235,058 224,893 58,238 59,273 183,651 518,939 — 1,423,222 Nonaccrual — — — — — 689 230 — 919 Total Commercial and Industrial 143,170 235,058 224,893 58,238 59,273 184,340 519,169 — 1,424,141 Commercial Construction Accrual 44,519 188,037 97,525 13,266 10,815 5,818 12,475 — 372,455 Nonaccrual — — — — — 384 — — 384 Total Commercial Construction 44,519 188,037 97,525 13,266 10,815 6,202 12,475 — 372,839 Business Banking Accrual 230,663 270,110 216,729 91,128 102,469 347,909 98,585 1,711 1,359,304 Nonaccrual — — — 39 292 3,560 — 119 4,010 Total Business Banking 230,663 270,110 216,729 91,167 102,761 351,469 98,585 1,830 1,363,314 Consumer Real Estate Accrual 225,529 326,331 149,205 101,895 67,487 195,678 554,139 23,024 1,643,288 Nonaccrual — 376 37 43 497 2,797 208 1,810 5,768 Total Consumer Real Estate 225,529 326,707 149,242 101,938 67,984 198,475 554,347 24,834 1,649,056 Other Consumer Accrual 10,284 13,136 7,522 3,291 1,544 746 75,803 2,719 115,045 Nonaccrual — — 7 196 — 131 — — 334 Total Other Consumer 10,284 13,136 7,529 3,487 1,544 877 75,803 2,719 115,379 Accrual 875,940 1,300,933 1,118,219 513,157 667,958 1,704,170 1,295,410 27,454 7,503,241 Nonaccrual — 376 44 278 789 8,823 438 1,929 12,677 Total Loan Balance $ 875,940 $ 1,301,309 $ 1,118,263 $ 513,435 $ 668,747 $ 1,712,993 $ 1,295,848 $ 29,383 $ 7,515,918 December 31, 2022 (dollars in thousands) 2022 2021 2020 2019 2018 2017 and Prior Revolving Revolving-Term Total Commercial Real Estate Accrual $ 292,732 $ 360,423 $ 269,049 $ 449,493 $ 261,941 $ 876,435 $ 21,666 $ — $ 2,531,739 Nonaccrual — — — — — 7,100 — — 7,100 Total Commercial Real Estate 292,732 360,423 269,049 449,493 261,941 883,535 21,666 — 2,538,839 Commercial and Industrial Accrual 253,696 289,448 88,544 73,998 65,858 147,273 591,292 — 1,510,109 Nonaccrual — — — — 53 — 230 — 283 Total Commercial and Industrial 253,696 289,448 88,544 73,998 65,911 147,273 591,522 — 1,510,392 Commercial Construction Accrual 120,655 170,691 40,762 14,442 3,953 3,792 27,284 — 381,579 Nonaccrual — — — — — 384 — — 384 Total Commercial Construction 120,655 170,691 40,762 14,442 3,953 4,176 27,284 — 381,963 Business Banking Accrual 287,679 233,656 91,149 109,479 83,689 289,435 105,172 1,195 1,201,454 Nonaccrual — 67 — 252 1,200 2,776 99 96 4,490 Total Business Banking 287,679 233,723 91,149 109,731 84,889 292,211 105,271 1,291 1,205,944 Consumer Real Estate Accrual 296,948 148,868 91,085 73,947 31,646 196,384 553,441 23,108 1,415,427 Nonaccrual — 135 528 636 385 3,785 208 849 6,526 Total Consumer Real Estate 296,948 149,003 91,613 74,583 32,031 200,169 553,649 23,957 1,421,953 Other Consumer Accrual 20,054 10,819 5,303 3,270 1,034 593 82,125 1,411 124,609 Nonaccrual — — 124 — — 131 — 14 269 Total Other Consumer 20,054 10,819 5,427 3,270 1,034 724 82,125 1,425 124,878 Accrual 1,271,764 1,213,905 585,892 724,629 448,121 1,513,912 1,380,980 25,714 7,164,917 Nonaccrual — 202 652 888 1,638 14,176 537 959 19,052 Total Loan Balance $ 1,271,764 $ 1,214,107 $ 586,544 $ 725,517 $ 449,759 $ 1,528,088 $ 1,381,517 $ 26,673 $ 7,183,969 The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented: September 30, 2023 (dollars in thousands) Current 30-59 Days 60-89 Days Nonaccrual Total Past Total Loans Commercial real estate $ 2,589,832 $ — $ 95 $ 1,262 $ 1,357 $ 2,591,189 Commercial and industrial 1,423,222 — — 919 919 1,424,141 Commercial construction 366,269 6,186 — 384 6,570 372,839 Business banking 1,356,627 1,826 851 4,010 6,687 1,363,314 Consumer real estate 1,638,157 2,104 3,027 5,768 10,899 1,649,056 Other consumer 114,792 212 41 334 587 115,379 Total $ 7,488,899 $ 10,328 $ 4,014 $ 12,677 $ 27,019 $ 7,515,918 December 31, 2022 (dollars in thousands) Current 30-59 Days 60-89 Days Nonaccrual Total Past Total Loans Commercial real estate $ 2,523,315 $ 8,424 $ — $ 7,100 $ 15,524 $ 2,538,839 Commercial and industrial 1,505,805 4,304 — 283 4,587 1,510,392 Commercial construction 381,579 — — 384 384 381,963 Business banking 1,199,586 1,583 285 4,490 6,358 1,205,944 Consumer real estate 1,409,907 3,617 1,903 6,526 12,046 1,421,953 Other consumer 124,384 165 60 269 494 124,878 Total $ 7,144,576 $ 18,093 $ 2,248 $ 19,052 $ 39,393 $ 7,183,969 The following tables present loans on nonaccrual status by class of loan for the year-to-date periods presented: September 30, 2023 (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 7,100 $ 1,262 $ — $ 5 Commercial and industrial 283 919 — 1 Commercial construction 384 384 — — Business banking 4,490 4,010 — 37 Consumer real estate 6,526 5,768 — 93 Other consumer 269 334 — — Total $ 19,052 $ 12,677 $ — $ 136 (1) Represents only cash payments received and applied to interest on nonaccrual loans. December 31, 2022 (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 31,488 $ 7,100 $ 5,649 $ 580 Commercial and industrial 15,239 283 — 148 Commercial construction 2,471 384 — 171 Business banking 9,641 4,490 933 228 Consumer real estate 7,294 6,526 — 257 Other consumer 158 269 — 1 Total $ 66,291 $ 19,052 $ 6,582 $ 1,385 (1) Represents only cash payments received and applied to interest on nonaccrual loans. There were no collateral-dependent loans as of September 30, 2023. The following table presents collateral-dependent loans by class of loans as of December 31, 2022: December 31, 2022 Type of Collateral (dollars in thousands) Real Estate Business Other Commercial real estate $ 5,649 $ — $ — Commercial and industrial — 626 — Commercial construction 1,655 — — Business banking 260 1,112 154 Consumer real estate 561 — — Total $ 8,125 $ 1,738 $ 154 The following tables present activity in the ACL for the periods presented: Three Months Ended September 30, 2023 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 40,837 $ 28,328 $ 6,739 $ 13,616 $ 13,418 $ 2,819 $ 105,757 Provision for credit losses on loans (1) (1,081) 6,068 93 (15) 896 198 6,159 Charge-offs — (3,033) — (590) (107) (347) (4,077) Recoveries 1 161 — 90 42 73 367 Net Recoveries/(Charge-offs) 1 (2,872) — (500) (65) (274) (3,710) Balance at End of Period $ 39,757 $ 31,524 $ 6,832 $ 13,101 $ 14,249 $ 2,743 $ 108,206 (1) Excludes the provision for credits losses for unfunded commitments. Three Months Ended September 30, 2022 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 45,314 $ 21,516 $ 6,583 $ 12,157 $ 9,673 $ 2,842 $ 98,085 Provision for credit losses on loans (1) (2,997) 3,806 (1,159) 950 1,075 634 2,309 Charge-offs (628) — — (178) (161) (272) (1,239) Recoveries 145 6 — 242 39 97 529 Net (Charge-offs)/Recoveries (483) 6 — 64 (122) (175) (710) Balance at End of Period $ 41,834 $ 25,338 $ 5,424 $ 13,171 $ 10,626 $ 3,301 $ 99,694 (1) Excludes the provision for credit losses for unfunded commitments. Nine Months Ended September 30, 2023 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 41,428 $ 25,710 $ 6,264 $ 12,547 $ 12,105 $ 3,286 $ 101,340 Impact of ASU 2022-02 — 75 215 251 278 (251) 568 Provision for credit losses on loans (1) (2,636) 14,424 351 1,325 1,934 462 15,860 Charge-offs — (18,253) — (1,252) (224) (1,029) (20,758) Recoveries 965 9,568 2 230 156 275 11,196 Net Recoveries/(Charge-offs) 965 (8,685) 2 (1,022) (68) (754) (9,562) Balance at End of Period $ 39,757 $ 31,524 $ 6,832 $ 13,101 $ 14,249 $ 2,743 $ 108,206 (1) Excludes the provision for credits losses for unfunded commitments. Nine Months Ended September 30, 2022 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 50,700 $ 19,727 $ 5,355 $ 11,338 $ 8,733 $ 2,723 $ 98,576 Provision for credit losses on loans (1) (8,471) 4,573 68 3,158 2,083 1,393 2,804 Charge-offs (827) (5,797) — (1,924) (299) (1,052) (9,899) Recoveries 432 6,835 1 599 109 237 8,213 Net (Charge-offs)/Recoveries (395) 1,038 1 (1,325) (190) (815) (1,686) Balance at End of Period $ 41,834 $ 25,338 $ 5,424 $ 13,171 $ 10,626 $ 3,301 $ 99,694 (1) Excludes the provision for credits losses for unfunded commitments.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Derivatives Designated as Hedging Instruments The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented: Derivative Assets Derivative Liabilities September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (dollars in thousands) Notional Fair Notional Amount Fair Notional Fair Notional Fair Derivatives Designated as Hedging Instruments Interest rate swap contracts - cash flow hedge $ — $ — $ — $ — $ 500,000 $ 25,668 $ 500,000 $ 21,368 Total Derivatives Designated as Hedging Instruments $ — $ — $ — $ — $ 500,000 $ 25,668 $ 500,000 $ 21,368 Derivatives Not Designated as Hedging Instruments Interest rate swap contracts - commercial loans $ 905,409 $ 93,601 $ 976,707 $ 83,449 $ 905,409 $ 94,438 $ 976,707 $ 83,449 Interest rate lock commitments - mortgage loans — — 126 5 — — — — Forward sales contracts - mortgage loans — — 130 2 — — — — Total Derivatives Not Designated as Hedging Instruments $ 905,409 $ 93,601 $ 976,963 $ 83,456 $ 905,409 $ 94,438 $ 976,707 $ 83,449 Total Derivatives $ 905,409 $ 93,601 $ 976,963 $ 83,456 $ 1,405,409 $ 120,106 $ 1,476,707 $ 104,817 The following table indicates the gross amounts of interest rate swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets at the dates presented: Derivatives (included Derivatives (included (dollars in thousands) September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 Gross amounts recognized $ 93,601 $ 83,449 $ 120,106 $ 104,817 Gross amounts offset — — — — Net amounts presented in the Consolidated Balance Sheets 93,601 83,449 120,106 104,817 Netting adjustments (1) (16,465) (15,196) (16,465) (15,196) Cash collateral (2) (77,049) (65,065) (10,506) (6,307) Net Amount $ 87 $ 3,188 $ 93,135 $ 83,314 (1) Netting adjustments represent the amounts recorded to convert derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. (2) Cash collateral represents the amount that cannot be used to offset our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The application of the cash collateral cannot reduce the net derivative position below zero. Therefore, excess cash collateral, if any, is not reflected above. The following table presents the effect, net of tax, of the cash flow hedges on OCI and on the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three month periods presented: Amount of Loss Recognized in Other Comprehensive Income (Loss) Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Interest Income (dollars in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Derivatives in Cash Flow Hedging Relationships: Interest rate swap contracts - cash flow hedge $ (1,647) $ (13,256) $ (2,749) $ 222 Total $ (1,647) $ (13,256) $ (2,749) $ 222 The following table presents the effect, net of tax, of the cash flow hedges on OCI and on the Condensed Consolidated Statements of Comprehensive Income (Loss) for the nine month periods presented: Amount of Loss Recognized in Other Comprehensive Income (Loss) Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Interest Income (dollars in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Derivatives in Cash Flow Hedging Relationships: Interest rate swap contracts - cash flow hedge $ (3,399) $ (17,875) $ (6,958) $ 947 Total $ (3,399) $ (17,875) $ (6,958) $ 947 Amounts reported in OCI related to derivatives that are designated as hedging instruments are reclassified to interest income as interest payments are received on variable rate assets. During the next twelve months, we estimate that an additional $13.7 million will be reclassified as a decrease to interest income. The following table indicates the gain or loss recognized in income on derivatives not designated as hedging instruments for the periods presented: Three months ended September 30, Nine months ended September 30, (dollars in thousands) 2023 2022 2023 2022 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ (851) $ 64 $ (851) $ 71 Interest rate lock commitments—mortgage loans — (58) (5) (404) Forward sale contracts—mortgage loans — 9 (2) 4 Total Derivatives (Loss) Gain $ (851) $ 15 $ (858) $ (329)

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
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 consolidated financial statements. Our exposure to credit loss, in the event the customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The following table sets forth our commitments and letters of credit as of the dates presented: (dollars in thousands) September 30, 2023 December 31, 2022 Commitments to extend credit $ 2,697,493 $ 2,713,586 Standby letters of credit 53,061 64,356 Total $ 2,750,554 $ 2,777,942 Allowance for Credit Losses on Unfunded Loan Commitments We maintain an allowance for credit losses on unfunded commercial and consumer 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 for the periods presented: Three months ended September 30, Nine months ended September 30, (dollars in thousands) 2023 2022 2023 2022 Balance at beginning of period $ 9,946 $ 7,387 $ 8,196 $ 5,189 Provision for credit losses (661) 189 1,089 2,387 Total $ 9,285 $ 7,576 $ 9,285 $ 7,576 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, 2023
Equity [Abstract]
OTHER COMPREHENSIVE INCOME (LOSS)	OTHER COMPREHENSIVE INCOME (LOSS) The following tables present the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended September 30, 2023 Three Months Ended September 30, 2022 (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 $ (12,977) $ 2,696 $ (10,281) $ (42,741) $ 9,121 $ (33,620) Change in interest rate swap (2,073) 426 (1,647) (16,852) 3,596 (13,256) Adjustment to funded status of employee benefit plans 440 (105) 335 (1,170) 250 (920) Other Comprehensive Income (Loss) $ (14,610) $ 3,017 $ (11,593) $ (60,763) $ 12,967 $ (47,796) Nine Months Ended September 30, 2023 Nine Months Ended September 30, 2022 (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 $ (13,107) $ 2,708 $ (10,399) $ (114,011) $ 24,325 $ (89,686) Change in interest rate swap (4,300) 902 (3,399) (22,724) 4,849 (17,875) Adjustment to funded status of employee benefit plans 365 (79) 287 (416) 100 (316) Other Comprehensive Income (Loss) $ (17,042) $ 3,531 $ (13,511) $ (137,151) $ 29,274 $ (107,877)

Share Repurchase Plan

Share Repurchase Plan	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
SHARE REPURCHASE PLAN	SHARE REPURCHASE PLAN On January 25, 2023, our Board of Directors authorized an extension of its $50 million share repurchase plan, which was set to expire March 31, 2023. This authorization extended the expiration date of the repurchase plan through March 31, 2024. The plan permits S&T to repurchase shares up to the previously authorized $50 million in aggregate value of S&T's common stock 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. The following table presents repurchase activity for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (in thousands, except share and per share data) 2023 2022 2023 2022 Value of shares authorized to repurchase $ 50,000 $ 50,000 $ 50,000 $ 50,000 Remaining plan capacity at the beginning of the period $ 9,807 $ 33,289 $ 29,805 $ 37,442 Total shares repurchased — 117,283 739,426 268,503 Average share price for the period $ — $ 29.71 $ 27.05 $ 28.44 Total cost of repurchases (1) $ (1) $ 3,484 $ 19,998 $ 7,637 Remaining plan capacity at the end of the period $ 9,808 $ 29,805 $ 9,808 $ 29,805 (1) Includes excise tax on repurchases, net of issuances for restricted stock awards.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 33,468	$ 37,249	$ 107,734	$ 95,250

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2023
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, 2022, filed with the Securities and Exchange Commission, or SEC, on February 24, 2023 (2022 Form 10-K). 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 Updated and Accounting Standards Updates Issued But Not Yet Adopted	Recently Adopted Accounting Standards Updates, or ASU, or Updated 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 provided 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 provided optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts and other transactions affected by the anticipated transition away from the London Inter-Bank Offered Rate, or LIBOR, toward new interest rate benchmarks. The optional guidance generally allowed 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 were effective as of March 12, 2020 through December 31, 2022. In January 2021, the FASB issued ASU 2021-01, Reference Rate Addendum (Topic 848) which clarified that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. The guidance was effective for all entities as of March 12, 2020 through December 31, 2022. In December 2022, the FASB issued ASU No 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848. The amendments in this ASU defer the sunset date for applying the reference rate reform relief by two years to December 31, 2024. We adopted ASU 2020-04 and ASU 2021-01 on January 1, 2022 and ASU 2022-06 upon issuance. We utilized the LIBOR transition relief as contract modifications were made during the course of the reference rate reform transition period. ASU 2020-04, ASU 2021-01 and ASU 2022-06 did not have a material impact on our consolidated financial statements. Financial Instruments Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures In March 2022, the FASB issued ASU 2022-02, Financial Instruments Credit Losses (Topic 326): Troubled Debt Restructuring and Vintage Disclosures. The guidance eliminates the “once a TDR, always a TDR” requirement for loan disclosures and requires disclosures about the performance of modified loans to borrowers experiencing financial difficulty in the 12 months following the modification. The amendments eliminate the recognition and measurement guidance related to TDRs for creditors that have adopted ASC 326 Financial Instruments - Credit Losses. We adopted ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, on January 1, 2020. ASC 326 requires the recognition of lifetime expected credit losses when a loan is originated or acquired, so the effect of credit losses that occur in loans modified in TDRs is already included in the allowance for credit losses. ASU 2022-02 requires a creditor to apply the loan refinancing and restructuring guidance in ASC 310-20 (consistent with the accounting for other loan modifications) to determine whether a modification results in a new loan or a continuation of an existing loan. It also requires enhanced disclosures for modifications in the form of interest rate reductions, principal forgiveness, other-than-insignificant payment delays or term extensions (or combinations thereof) of loans made to borrowers experiencing financial difficulty. Disclosures are required regardless of whether a modification of a loan to a borrower experiencing financial difficulty results in a new loan. The objective of the disclosures is to provide information about the type and magnitude of modifications and the degree of their success in mitigating potential credit losses. The amendments in this ASU were effective for fiscal years beginning after December 15, 2022, and interim periods therein. We adopted ASU 2022-02, as of January 1, 2023, using a modified retrospective transition approach. Results for reporting periods beginning after January 1, 2023 are presented under ASU 2022-02 while prior period amounts continue to be reported in accordance with previously applicable GAAP. Under the previously applicable accounting guidance, commercial TDRs were individually assessed to determine if a specific reserve was required in the allowance for credit losses, or ACL. The elimination of TDRs resulted in these loans being included in homogenous pools. The adoption of this ASU resulted in a day one cumulative effective adjustment of $0.6 million which increased our ACL and decreased retained earnings. Refer to Note 5 Loans and Allowance for Credit Losses for additional disclosures related to modifications of loans to borrowers experiencing financial difficulty as well as gross charge-off vintage disclosures. Accounting Standards Updates Issued But Not Yet Adopted Investments Equity Method and Joint Ventures (Topic 323) Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method In March 2023, the FASB issued ASU 2023-02, Investments Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method to allow reporting entities to consistently account for equity investments made primarily for the purpose of receiving income tax credits and other income tax benefits. If certain conditions are met, a reporting entity may elect to account for its tax equity investments by using the proportional amortization method regardless of the program from which it receives income tax credits, instead of only low-income-housing tax credit (“LIHTC”) structures. This amendment also eliminates certain LIHTC specific guidance aligning the accounting with other equity investments in tax credit structures. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. We are evaluating the accounting and disclosure requirements of ASU 2023-02 and do not expect them to have a material effect 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 financial instruments 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.
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 these loans are 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 1-4 family residential mortgages, home equity loans and home equity lines of credit. 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 of credit. 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.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2023
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) 2023 2022 2023 2022 Numerator for Earnings per Share—Basic and Diluted: Net income $ 33,468 $ 37,249 $ 107,734 $ 95,250 Less: Income allocated to participating shares 32 98 138 223 Net Income Allocated to Shareholders $ 33,436 $ 37,151 $ 107,596 $ 95,027 Denominator for Earnings per Share—Basic: Weighted Average Shares Outstanding—Basic 38,174,804 38,937,771 38,514,617 39,030,325 Denominator for Earnings per Share—Two-Class Method—Diluted: Weighted Average Shares Outstanding—Basic 38,174,804 38,937,771 38,514,617 39,030,325 Add: Average participating shares outstanding 161,212 37,374 154,347 18,826 Denominator for Two-Class Method—Diluted 38,336,016 38,975,145 38,668,964 39,049,151 Earnings per share—basic $ 0.88 $ 0.95 $ 2.79 $ 2.43 Earnings per share—diluted $ 0.87 $ 0.95 $ 2.78 $ 2.43 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 721 655 231 1,027

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
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 the dates presented: September 30, 2023 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ 130,037 $ — $ — $ 130,037 Obligations of U.S. government corporations and agencies — 42,049 — 42,049 Collateralized mortgage obligations of U.S. government corporations and agencies — 429,978 — 429,978 Residential mortgage-backed securities of U.S. government corporations and agencies — 36,886 — 36,886 Commercial mortgage-backed securities of U.S. government corporations and agencies — 286,107 — 286,107 Obligations of states and political subdivisions — 29,210 — 29,210 Total Available-for-Sale Debt Securities 130,037 824,230 — 954,267 Equity securities 923 72 — 995 Total Securities Available for Sale 130,960 824,302 — 955,262 Securities held in a deferred compensation plan 8,289 — — 8,289 Derivative financial assets: Interest rate swaps - commercial loans — 93,601 — 93,601 Total Assets $ 139,249 $ 917,903 $ — $ 1,057,152 LIABILITIES Derivative financial liabilities: Interest rate swaps - commercial loans $ — $ 94,438 $ — $ 94,438 Interest rate swaps - cash flow hedge — 25,668 — 25,668 Total Liabilities $ — $ 120,106 $ — $ 120,106 December 31, 2022 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ 131,695 $ — $ — $ 131,695 Obligations of U.S. government corporations and agencies — 41,811 — 41,811 Collateralized mortgage obligations of U.S. government corporations and agencies — 428,407 — 428,407 Residential mortgage-backed securities of U.S. government corporations and agencies — 41,587 — 41,587 Commercial mortgage-backed securities of U.S. government corporations and agencies — 327,313 — 327,313 Corporate obligations — 500 — 500 Obligations of states and political subdivisions — 30,471 — 30,471 Total Available-for-Sale Debt Securities 131,695 870,089 — 1,001,784 Equity securities 952 42 — 994 Total Securities Available for Sale 132,647 870,131 — 1,002,778 Securities held in a deferred compensation plan 8,087 — — 8,087 Derivative financial assets: Interest rate swaps - commercial loans — 83,449 — 83,449 Interest rate lock commitments — — 5 5 Forward sale contracts - mortgage loans — — 2 2 Total Assets $ 140,734 $ 953,580 $ 7 $ 1,094,321 LIABILITIES Derivative financial liabilities: Interest rate swaps - commercial loans $ — $ 83,449 $ — $ 83,449 Interest rate swaps - cash flow hedge — 21,368 — 21,368 Total Liabilities $ — $ 104,817 $ — $ 104,817
Schedule of Carrying Values and Fair Values of Financial Instruments	The following tables present the carrying values and fair values of our financial instruments at the dates presented: Carrying Value (1) Fair Value Measurements at September 30, 2023 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 238,453 $ 238,453 $ 238,453 $ — $ — Securities available for sale 955,262 955,262 130,960 824,302 Loans held for sale 257 257 — 257 — Portfolio loans, net 7,407,712 7,059,741 — — 7,059,741 Collateral receivable 10,506 10,506 10,506 — — Securities held in a deferred compensation plan 8,289 8,289 8,289 — — Mortgage servicing rights 6,534 9,411 — — 9,411 Interest rate swaps - commercial loans 93,601 93,601 — 93,601 — LIABILITIES Deposits $ 7,222,897 $ 7,205,014 $ 5,735,018 $ 1,469,996 $ — Collateral payable 77,049 77,049 77,049 — — Short-term borrowings 630,000 630,000 — 630,000 — Long-term borrowings 39,396 38,983 — 38,983 — Junior subordinated debt securities 49,343 49,343 — 49,343 — Interest rate swaps - commercial loans 94,438 94,438 — 94,438 — Interest rate swaps - cash flow hedge 25,668 25,668 — 25,668 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2022 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 210,009 $ 210,009 $ 210,009 $ — $ — Securities available for sale 1,002,778 1,002,778 132,647 870,131 — Loans held for sale 16 16 — 16 — Portfolio loans, net 7,082,629 6,815,167 — — 6,815,167 Collateral receivable 6,307 6,307 6,307 — — Securities held in a deferred compensation plan 8,087 8,087 8,087 — — Mortgage servicing rights 7,147 9,994 — — 9,994 Interest rate swaps - commercial loans 83,449 83,449 — 83,449 — Interest rate lock commitments 5 5 — — 5 Forward sale contracts 2 2 — — 2 LIABILITIES Deposits $ 7,219,970 $ 7,194,225 $ 6,285,377 $ 908,848 $ — Collateral payable 65,065 65,065 65,065 — — Short-term borrowings 370,000 370,000 — 370,000 — Long-term borrowings 14,741 14,174 — 14,174 — Junior subordinated debt securities 54,453 54,453 — 54,453 — Interest rate swaps - commercial loans 83,449 83,449 — 83,449 — Interest rate swaps - cash flow hedge 21,368 21,368 — 21,368 — (1) As reported in the Consolidated Balance Sheets

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 December 31, 2022 Debt securities $ 954,267 $ 1,001,784 Equity securities 995 994 Total Securities Available for Sale $ 955,262 $ 1,002,778
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, 2023 December 31, 2022 (dollars in thousands) Amortized Gross Gross Fair Amortized Gross Unrealized Gains Gross Fair U.S. Treasury securities $ 144,575 $ — $ (14,538) $ 130,037 $ 145,416 $ — $ (13,721) $ 131,695 Obligations of U.S. government corporations and agencies 43,377 — (1,328) 42,049 43,479 — (1,668) 41,811 Collateralized mortgage obligations of U.S. government corporations and agencies 493,359 — (63,381) 429,978 482,039 203 (53,835) 428,407 Residential mortgage-backed securities of U.S. government corporations and agencies 45,802 — (8,916) 36,886 49,418 3 (7,834) 41,587 Commercial mortgage-backed securities of U.S. government corporations and agencies 312,191 — (26,084) 286,107 352,465 — (25,152) 327,313 Corporate obligations — — — — 500 — — 500 Obligations of states and political subdivisions 30,391 — (1,181) 29,210 30,788 55 (372) 30,471 Total Available-for-Sale Debt Securities (1) $ 1,069,695 $ — $ (115,428) $ 954,267 $ 1,104,105 $ 261 $ (102,582) $ 1,001,784 (1) Excludes interest receivable of $3.4 million at September 30, 2023 and $3.7 million at December 31, 2022. 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, 2023 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 1 $ 9,895 $ (203) 13 $ 120,142 $ (14,335) 14 $ 130,037 $ (14,538) Obligations of U.S. government corporations and agencies — — — 6 42,049 (1,328) 6 42,049 (1,328) Collateralized mortgage obligations of U.S. government corporations and agencies 8 78,608 (2,402) 57 351,370 (60,979) 65 429,978 (63,381) Residential mortgage-backed securities of U.S. government corporations and agencies 12 319 (7) 14 36,567 (8,909) 26 36,886 (8,916) Commercial mortgage-backed securities of U.S. government corporations and agencies 2 18,525 (591) 31 267,582 (25,493) 33 286,107 (26,084) Obligations of states and political subdivisions 5 29,210 (1,181) — — — 5 29,210 (1,181) Total 28 $ 136,557 $ (4,384) 121 $ 817,710 $ (111,044) 149 $ 954,267 $ (115,428) December 31, 2022 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 6 $ 57,057 $ (3,363) 8 $ 74,638 $ (10,358) 14 $ 131,695 $ (13,721) Obligations of U.S. government corporations and agencies 6 41,811 (1,668) — — — 6 41,811 (1,668) Collateralized mortgage obligations of U.S. government corporations and agencies 47 296,509 (28,153) 13 112,902 (25,682) 60 409,411 (53,835) Residential mortgage-backed securities of U.S. government corporations and agencies 25 7,143 (589) 3 34,223 (7,245) 28 41,366 (7,834) Commercial mortgage-backed securities of U.S. government corporations and agencies 30 241,009 (11,975) 7 86,304 (13,177) 37 327,313 (25,152) Obligations of states and political subdivisions 2 20,127 (372) — — — 2 20,127 (372) Total 116 $ 663,656 $ (46,120) 31 $ 308,067 $ (56,462) 147 $ 971,723 $ (102,582)
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, 2023 December 31, 2022 (dollars in thousands) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Losses Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Losses Total unrealized gains (losses) on available-for-sale debt securities $ — $ (115,428) $ (115,428) $ 261 $ (102,582) $ (102,321) Income tax (expense) benefit — 24,567 24,567 (56) 21,915 21,859 Net Unrealized Gains (Losses), Net of Tax Included in Accumulated Other Comprehensive Income (Loss) $ — $ (90,861) $ (90,861) $ 205 $ (80,667) $ (80,462)
Schedule of Contractual Maturities of Debt Securities	The amortized cost and fair value of available-for-sale debt securities at September 30, 2023 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, 2023 (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 $ 28,010 $ 27,485 Due after one year through five years 162,599 147,194 Due after five years through ten years 16,357 15,835 Due after ten years 11,377 10,782 Available-for-Sale Debt Securities With Fixed Maturities 218,343 201,296 Debt Securities without a single maturity date Collateralized mortgage obligations of U.S. government corporations and agencies 493,359 429,978 Residential mortgage-backed securities of U.S. government corporations and agencies 45,802 36,886 Commercial mortgage-backed securities of U.S. government corporations and agencies 312,191 286,107 Total Available-for-Sale Debt Securities $ 1,069,695 $ 954,267

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Schedule of Composition of Loans	The following table summarizes the composition of originated and acquired loans as of the dates presented: (dollars in thousands) September 30, 2023 December 31, 2022 Commercial real estate $ 2,591,189 $ 2,538,839 Commercial and industrial 1,424,141 1,510,392 Commercial construction 372,839 381,963 Business banking 1,363,314 1,205,944 Consumer real estate 1,649,056 1,421,953 Other consumer 115,379 124,878 Total Portfolio Loans $ 7,515,918 $ 7,183,969 Loans held for sale 257 16 Total Loans (1) $ 7,516,175 $ 7,183,985 (1)
Summary of Restructured Loans for Periods Presented	The following table presents the amortized cost of loans to borrowers experiencing financial difficulty by portfolio segment and type of modification during the periods presented: Three Months Ended September 30, 2023 (dollars in thousands) Term Extension Term Extension and Interest Rate Reduction Total % of Portfolio Segment Commercial real estate $ — $ — $ — — % Commercial industrial 6,347 — 6,347 0.45 % Commercial construction — — — — % Business banking — — — — % Consumer real estate — — — — % Total (1) $ 6,347 $ — $ 6,347 0.08 % (1) Excludes loans that were fully paid off or fully charged-off by period end. Nine Months Ended September 30, 2023 (dollars in thousands) Term Extension Term Extension and Interest Rate Reduction Total % of Portfolio Segment Commercial real estate $ 13,505 $ — $ 13,505 0.52 % Commercial industrial 6,892 — 6,892 0.48 % Commercial construction 1,610 — 1,610 0.43 % Business banking 658 — 658 0.05 % Consumer real estate 62 191 253 0.02 % Total (1) $ 22,727 $ 191 $ 22,918 0.30 % (1) Excludes loans that were fully paid off or fully charged-off by period end. The following table describes the effect of loan modifications made to borrowers experiencing financial difficulty during the periods presented: Three Months Ended September 30, 2023 Nine Months Ended September 30, 2023 Weighted-Average Weighted-Average Weighted-Average Weighted-Average Commercial real estate 0 — 7 — Commercial industrial 2 — 6 — Commercial construction 0 — 5 — Business banking 0 — 5 — Consumer real estate 0 — 168 2% The following table summarizes TDRs as of the date presented: December 31, 2022 (dollars in thousands) Accruing Nonaccruing Total Commercial real estate $ — $ — $ — Commercial and industrial 626 — 626 Commercial construction 1,655 — 1,655 Business banking 438 1,087 1,525 Consumer real estate 6,168 1,798 7,966 Other consumer 4 9 13 Total $ 8,891 $ 2,894 $ 11,785 The following tables present the TDRs by portfolio segment and type of concession for the periods presented: Three Months Ended September 30, 2022 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 — — — — — — — — Commercial construction — — — — — — — — Business banking — — — — — — — — Consumer real estate 6 172 — — — — 172 173 Other consumer 1 9 — — — — 9 12 Total 7 $ 181 $ — $ — $ — $ — $ 181 $ 185 (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, 2022 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 — — — — — — — — Commercial construction — — — — — — — — Business banking — — — — — — — — Consumer real estate 21 1,204 — 862 — — 2,066 2,530 Other consumer 2 11 — — — — 11 15 Total 23 $ 1,215 $ — $ 862 $ — $ — $ 2,077 $ 2,545 (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 Aging Analysis of Modifications	The following table presents the aging analysis of modifications to borrowers experiencing financial difficulty in the last 12 months as of the date presented: September 30, 2023 (dollars in thousands) Current 30-59 Days 60-89 Days 90+ Days Past Due Total Commercial real estate $ 13,505 $ — $ — $ — $ 13,505 Commercial and industrial 6,447 — — 445 6,892 Commercial construction — 1,610 — — 1,610 Business banking 658 — — — 658 Consumer real estate 191 — 62 — 253 Total $ 20,801 $ 1,610 $ 62 $ 445 $ 22,918
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, 2023 December 31, 2022 Nonperforming Assets Nonaccrual Loans $ 12,677 $ 19,052 OREO 3,715 3,065 Total Nonperforming Assets $ 16,392 $ 22,117 The following tables present loans on nonaccrual status by class of loan for the year-to-date periods presented: September 30, 2023 (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 7,100 $ 1,262 $ — $ 5 Commercial and industrial 283 919 — 1 Commercial construction 384 384 — — Business banking 4,490 4,010 — 37 Consumer real estate 6,526 5,768 — 93 Other consumer 269 334 — — Total $ 19,052 $ 12,677 $ — $ 136 (1) Represents only cash payments received and applied to interest on nonaccrual loans. December 31, 2022 (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 31,488 $ 7,100 $ 5,649 $ 580 Commercial and industrial 15,239 283 — 148 Commercial construction 2,471 384 — 171 Business banking 9,641 4,490 933 228 Consumer real estate 7,294 6,526 — 257 Other consumer 158 269 — 1 Total $ 66,291 $ 19,052 $ 6,582 $ 1,385 (1) Represents only cash payments received and applied to interest on nonaccrual loans.
Schedule of Loans Credit Quality Indicators	The following tables present loan balances by year of origination and internally assigned risk rating for our portfolio segments as of the dates presented: September 30, 2023 Risk Rating (dollars in thousands) 2023 2022 2021 2020 2019 2018 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 221,775 $ 268,261 $ 416,345 $ 242,965 $ 377,358 $ 785,748 $ 35,469 $ — $ 2,347,921 Special mention — — 6,000 1,107 38,236 106,995 — — 152,338 Substandard — — — 1,267 10,776 78,887 — — 90,930 Doubtful — — — — — — — — — Total Commercial Real Estate 221,775 268,261 422,345 245,339 426,370 971,630 35,469 — 2,591,189 Year-to-date Gross Charge-offs — — — — — — — — — Commercial and Industrial Pass 143,170 234,153 199,719 56,549 53,214 173,188 478,363 — 1,338,356 Special mention — 651 11,698 1,689 — 8,461 15,359 — 37,858 Substandard — 254 13,476 — 6,059 2,691 25,447 — 47,927 Doubtful — — — — — — — — — Total Commercial and Industrial 143,170 235,058 224,893 58,238 59,273 184,340 519,169 — 1,424,141 Year-to-date Gross Charge-offs — — — — 3,412 11,808 3,033 — 18,253 Commercial Construction Pass 44,519 188,037 97,525 13,266 2,575 4,368 12,475 — 362,765 Special mention — — — — — — — — — Substandard — — — — 8,240 1,834 — — 10,074 Doubtful — — — — — — — — — Total Commercial Construction 44,519 188,037 97,525 13,266 10,815 6,202 12,475 — 372,839 Year-to-date Gross Charge-offs — — — — — — — — — Business Banking Pass 230,663 270,093 213,953 90,386 99,541 337,456 98,434 781 1,341,307 Special mention — — 263 227 — 3,307 37 179 4,013 Substandard — 17 2,513 554 3,220 10,706 114 870 17,994 Doubtful — — — — — — — — — Total Business Banking 230,663 270,110 216,729 91,167 102,761 351,469 98,585 1,830 1,363,314 Year-to-date Gross Charge-offs — 67 43 1 88 1,018 35 — 1,252 Consumer Real Estate Pass 225,529 326,499 149,042 101,799 67,478 192,173 553,737 22,393 1,638,650 Special mention — — — — — 116 — — 116 Substandard — 208 200 139 506 6,186 610 2,441 10,290 Doubtful — — — — — — — — — Total Consumer Real Estate 225,529 326,707 149,242 101,938 67,984 198,475 554,347 24,834 1,649,056 Year-to-date Gross Charge-offs — 1 — 5 1 43 75 99 224 Other Consumer Pass 10,284 13,136 7,503 3,483 1,523 728 75,803 2,703 115,163 Special mention — — — — — — — — — Substandard — — 26 4 21 149 — 16 216 Doubtful — — — — — — — — — Total Other Consumer 10,284 13,136 7,529 3,487 1,544 877 75,803 2,719 115,379 Year-to-date Gross Charge-offs 551 116 148 8 28 5 — 173 1,029 Pass 875,940 1,300,179 1,084,087 508,448 601,689 1,493,661 1,254,281 25,877 7,144,162 Special mention — 651 17,961 3,023 38,236 118,879 15,396 179 194,325 Substandard — 479 16,215 1,964 28,822 100,453 26,171 3,327 177,431 Doubtful — — — — — — — — — Total Loan Balance $ 875,940 $ 1,301,309 $ 1,118,263 $ 513,435 $ 668,747 $ 1,712,993 $ 1,295,848 $ 29,383 $ 7,515,918 Current Year-to-date Gross Charge-offs $ 551 $ 184 $ 191 $ 14 $ 3,529 $ 12,874 $ 3,143 $ 272 $ 20,758 December 31, 2022 Risk Rating (dollars in thousands) 2022 2021 2020 2019 2018 2017 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 292,732 $ 360,423 $ 267,743 $ 422,872 $ 227,006 $ 704,600 $ 21,666 $ — $ 2,297,042 Special mention — — — 13,187 20,090 101,112 — — 134,389 Substandard — — 1,306 13,434 14,845 77,823 — — 107,408 Doubtful — — — — — — — — — Total Commercial Real Estate 292,732 360,423 269,049 449,493 261,941 883,535 21,666 — 2,538,839 Commercial and Industrial Pass 253,324 264,012 88,544 63,190 62,874 138,250 559,777 — 1,429,971 Special mention — 25,436 — 5,103 1,885 7,132 19,280 — 58,836 Substandard 372 — — 5,705 1,152 1,891 12,465 — 21,585 Doubtful — — — — — — — — — Total Commercial and Industrial 253,696 289,448 88,544 73,998 65,911 147,273 591,522 — 1,510,392 Commercial Construction Pass 120,655 159,737 40,762 6,338 3,953 2,297 27,284 — 361,026 Special mention — 10,954 — 8,104 — — — — 19,058 Substandard — — — — — 1,879 — — 1,879 Doubtful — — — — — — — — — Total Commercial Construction 120,655 170,691 40,762 14,442 3,953 4,176 27,284 — 381,963 Business Banking Pass 287,520 233,499 87,926 107,819 80,549 276,843 104,354 645 1,179,155 Special mention — 157 146 — 2,790 3,945 793 95 7,926 Substandard 159 67 3,077 1,912 1,550 11,391 124 551 18,831 Doubtful — — — — — 32 — — 32 Total Business Banking 287,679 233,723 91,149 109,731 84,889 292,211 105,271 1,291 1,205,944 Consumer Real Estate Pass 296,900 148,790 91,477 74,155 30,658 191,228 552,994 21,547 1,407,749 Special mention — — — — — 882 — — 882 Substandard 48 213 136 428 1,373 8,059 655 2,410 13,322 Doubtful — — — — — — — — — Total Consumer Real Estate 296,948 149,003 91,613 74,583 32,031 200,169 553,649 23,957 1,421,953 Other Consumer Pass 20,046 10,819 5,427 3,242 1,013 724 82,125 1,404 124,800 Special mention — — — — — — — — — Substandard 8 — — 28 21 — — 21 78 Doubtful — — — — — — — — — Total Other Consumer 20,054 10,819 5,427 3,270 1,034 724 82,125 1,425 124,878 Pass 1,271,177 1,177,280 581,879 677,616 406,053 1,313,942 1,348,200 23,596 6,799,743 Special Mention — 36,547 146 26,394 24,765 113,071 20,073 95 221,091 Substandard 587 280 4,519 21,507 18,941 101,043 13,244 2,982 163,103 Doubtful — — — — — 32 — — 32 Total Loan Balance $ 1,271,764 $ 1,214,107 $ 586,544 $ 725,517 $ 449,759 $ 1,528,088 $ 1,381,517 $ 26,673 $ 7,183,969 The following tables present loan balances by year of origination and accrual and nonaccrual status for our portfolio segments as of the dates presented: September 30, 2023 (dollars in thousands) 2023 2022 2021 2020 2019 2018 and Prior Revolving Revolving-Term Total Commercial Real Estate Accrual $ 221,775 $ 268,261 $ 422,345 $ 245,339 $ 426,370 $ 970,368 $ 35,469 $ — $ 2,589,927 Nonaccrual — — — — — 1,262 — — 1,262 Total Commercial Real Estate 221,775 268,261 422,345 245,339 426,370 971,630 35,469 — 2,591,189 Commercial and Industrial Accrual 143,170 235,058 224,893 58,238 59,273 183,651 518,939 — 1,423,222 Nonaccrual — — — — — 689 230 — 919 Total Commercial and Industrial 143,170 235,058 224,893 58,238 59,273 184,340 519,169 — 1,424,141 Commercial Construction Accrual 44,519 188,037 97,525 13,266 10,815 5,818 12,475 — 372,455 Nonaccrual — — — — — 384 — — 384 Total Commercial Construction 44,519 188,037 97,525 13,266 10,815 6,202 12,475 — 372,839 Business Banking Accrual 230,663 270,110 216,729 91,128 102,469 347,909 98,585 1,711 1,359,304 Nonaccrual — — — 39 292 3,560 — 119 4,010 Total Business Banking 230,663 270,110 216,729 91,167 102,761 351,469 98,585 1,830 1,363,314 Consumer Real Estate Accrual 225,529 326,331 149,205 101,895 67,487 195,678 554,139 23,024 1,643,288 Nonaccrual — 376 37 43 497 2,797 208 1,810 5,768 Total Consumer Real Estate 225,529 326,707 149,242 101,938 67,984 198,475 554,347 24,834 1,649,056 Other Consumer Accrual 10,284 13,136 7,522 3,291 1,544 746 75,803 2,719 115,045 Nonaccrual — — 7 196 — 131 — — 334 Total Other Consumer 10,284 13,136 7,529 3,487 1,544 877 75,803 2,719 115,379 Accrual 875,940 1,300,933 1,118,219 513,157 667,958 1,704,170 1,295,410 27,454 7,503,241 Nonaccrual — 376 44 278 789 8,823 438 1,929 12,677 Total Loan Balance $ 875,940 $ 1,301,309 $ 1,118,263 $ 513,435 $ 668,747 $ 1,712,993 $ 1,295,848 $ 29,383 $ 7,515,918 December 31, 2022 (dollars in thousands) 2022 2021 2020 2019 2018 2017 and Prior Revolving Revolving-Term Total Commercial Real Estate Accrual $ 292,732 $ 360,423 $ 269,049 $ 449,493 $ 261,941 $ 876,435 $ 21,666 $ — $ 2,531,739 Nonaccrual — — — — — 7,100 — — 7,100 Total Commercial Real Estate 292,732 360,423 269,049 449,493 261,941 883,535 21,666 — 2,538,839 Commercial and Industrial Accrual 253,696 289,448 88,544 73,998 65,858 147,273 591,292 — 1,510,109 Nonaccrual — — — — 53 — 230 — 283 Total Commercial and Industrial 253,696 289,448 88,544 73,998 65,911 147,273 591,522 — 1,510,392 Commercial Construction Accrual 120,655 170,691 40,762 14,442 3,953 3,792 27,284 — 381,579 Nonaccrual — — — — — 384 — — 384 Total Commercial Construction 120,655 170,691 40,762 14,442 3,953 4,176 27,284 — 381,963 Business Banking Accrual 287,679 233,656 91,149 109,479 83,689 289,435 105,172 1,195 1,201,454 Nonaccrual — 67 — 252 1,200 2,776 99 96 4,490 Total Business Banking 287,679 233,723 91,149 109,731 84,889 292,211 105,271 1,291 1,205,944 Consumer Real Estate Accrual 296,948 148,868 91,085 73,947 31,646 196,384 553,441 23,108 1,415,427 Nonaccrual — 135 528 636 385 3,785 208 849 6,526 Total Consumer Real Estate 296,948 149,003 91,613 74,583 32,031 200,169 553,649 23,957 1,421,953 Other Consumer Accrual 20,054 10,819 5,303 3,270 1,034 593 82,125 1,411 124,609 Nonaccrual — — 124 — — 131 — 14 269 Total Other Consumer 20,054 10,819 5,427 3,270 1,034 724 82,125 1,425 124,878 Accrual 1,271,764 1,213,905 585,892 724,629 448,121 1,513,912 1,380,980 25,714 7,164,917 Nonaccrual — 202 652 888 1,638 14,176 537 959 19,052 Total Loan Balance $ 1,271,764 $ 1,214,107 $ 586,544 $ 725,517 $ 449,759 $ 1,528,088 $ 1,381,517 $ 26,673 $ 7,183,969 There were no collateral-dependent loans as of September 30, 2023. The following table presents collateral-dependent loans by class of loans as of December 31, 2022: December 31, 2022 Type of Collateral (dollars in thousands) Real Estate Business Other Commercial real estate $ 5,649 $ — $ — Commercial and industrial — 626 — Commercial construction 1,655 — — Business banking 260 1,112 154 Consumer real estate 561 — — Total $ 8,125 $ 1,738 $ 154
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, 2023 (dollars in thousands) Current 30-59 Days 60-89 Days Nonaccrual Total Past Total Loans Commercial real estate $ 2,589,832 $ — $ 95 $ 1,262 $ 1,357 $ 2,591,189 Commercial and industrial 1,423,222 — — 919 919 1,424,141 Commercial construction 366,269 6,186 — 384 6,570 372,839 Business banking 1,356,627 1,826 851 4,010 6,687 1,363,314 Consumer real estate 1,638,157 2,104 3,027 5,768 10,899 1,649,056 Other consumer 114,792 212 41 334 587 115,379 Total $ 7,488,899 $ 10,328 $ 4,014 $ 12,677 $ 27,019 $ 7,515,918 December 31, 2022 (dollars in thousands) Current 30-59 Days 60-89 Days Nonaccrual Total Past Total Loans Commercial real estate $ 2,523,315 $ 8,424 $ — $ 7,100 $ 15,524 $ 2,538,839 Commercial and industrial 1,505,805 4,304 — 283 4,587 1,510,392 Commercial construction 381,579 — — 384 384 381,963 Business banking 1,199,586 1,583 285 4,490 6,358 1,205,944 Consumer real estate 1,409,907 3,617 1,903 6,526 12,046 1,421,953 Other consumer 124,384 165 60 269 494 124,878 Total $ 7,144,576 $ 18,093 $ 2,248 $ 19,052 $ 39,393 $ 7,183,969
Schedule of Allowance for Credit Loss	The following tables present activity in the ACL for the periods presented: Three Months Ended September 30, 2023 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 40,837 $ 28,328 $ 6,739 $ 13,616 $ 13,418 $ 2,819 $ 105,757 Provision for credit losses on loans (1) (1,081) 6,068 93 (15) 896 198 6,159 Charge-offs — (3,033) — (590) (107) (347) (4,077) Recoveries 1 161 — 90 42 73 367 Net Recoveries/(Charge-offs) 1 (2,872) — (500) (65) (274) (3,710) Balance at End of Period $ 39,757 $ 31,524 $ 6,832 $ 13,101 $ 14,249 $ 2,743 $ 108,206 (1) Excludes the provision for credits losses for unfunded commitments. Three Months Ended September 30, 2022 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 45,314 $ 21,516 $ 6,583 $ 12,157 $ 9,673 $ 2,842 $ 98,085 Provision for credit losses on loans (1) (2,997) 3,806 (1,159) 950 1,075 634 2,309 Charge-offs (628) — — (178) (161) (272) (1,239) Recoveries 145 6 — 242 39 97 529 Net (Charge-offs)/Recoveries (483) 6 — 64 (122) (175) (710) Balance at End of Period $ 41,834 $ 25,338 $ 5,424 $ 13,171 $ 10,626 $ 3,301 $ 99,694 (1) Excludes the provision for credit losses for unfunded commitments. Nine Months Ended September 30, 2023 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 41,428 $ 25,710 $ 6,264 $ 12,547 $ 12,105 $ 3,286 $ 101,340 Impact of ASU 2022-02 — 75 215 251 278 (251) 568 Provision for credit losses on loans (1) (2,636) 14,424 351 1,325 1,934 462 15,860 Charge-offs — (18,253) — (1,252) (224) (1,029) (20,758) Recoveries 965 9,568 2 230 156 275 11,196 Net Recoveries/(Charge-offs) 965 (8,685) 2 (1,022) (68) (754) (9,562) Balance at End of Period $ 39,757 $ 31,524 $ 6,832 $ 13,101 $ 14,249 $ 2,743 $ 108,206 (1) Excludes the provision for credits losses for unfunded commitments. Nine Months Ended September 30, 2022 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 50,700 $ 19,727 $ 5,355 $ 11,338 $ 8,733 $ 2,723 $ 98,576 Provision for credit losses on loans (1) (8,471) 4,573 68 3,158 2,083 1,393 2,804 Charge-offs (827) (5,797) — (1,924) (299) (1,052) (9,899) Recoveries 432 6,835 1 599 109 237 8,213 Net (Charge-offs)/Recoveries (395) 1,038 1 (1,325) (190) (815) (1,686) Balance at End of Period $ 41,834 $ 25,338 $ 5,424 $ 13,171 $ 10,626 $ 3,301 $ 99,694 (1) Excludes the provision for credits losses for unfunded commitments.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2023
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: Derivative Assets Derivative Liabilities September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (dollars in thousands) Notional Fair Notional Amount Fair Notional Fair Notional Fair Derivatives Designated as Hedging Instruments Interest rate swap contracts - cash flow hedge $ — $ — $ — $ — $ 500,000 $ 25,668 $ 500,000 $ 21,368 Total Derivatives Designated as Hedging Instruments $ — $ — $ — $ — $ 500,000 $ 25,668 $ 500,000 $ 21,368 Derivatives Not Designated as Hedging Instruments Interest rate swap contracts - commercial loans $ 905,409 $ 93,601 $ 976,707 $ 83,449 $ 905,409 $ 94,438 $ 976,707 $ 83,449 Interest rate lock commitments - mortgage loans — — 126 5 — — — — Forward sales contracts - mortgage loans — — 130 2 — — — — Total Derivatives Not Designated as Hedging Instruments $ 905,409 $ 93,601 $ 976,963 $ 83,456 $ 905,409 $ 94,438 $ 976,707 $ 83,449 Total Derivatives $ 905,409 $ 93,601 $ 976,963 $ 83,456 $ 1,405,409 $ 120,106 $ 1,476,707 $ 104,817
Schedule of Interest Rate Derivatives	The following table indicates the gross amounts of interest rate swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets at the dates presented: Derivatives (included Derivatives (included (dollars in thousands) September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 Gross amounts recognized $ 93,601 $ 83,449 $ 120,106 $ 104,817 Gross amounts offset — — — — Net amounts presented in the Consolidated Balance Sheets 93,601 83,449 120,106 104,817 Netting adjustments (1) (16,465) (15,196) (16,465) (15,196) Cash collateral (2) (77,049) (65,065) (10,506) (6,307) Net Amount $ 87 $ 3,188 $ 93,135 $ 83,314 (1) Netting adjustments represent the amounts recorded to convert derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. (2) Cash collateral represents the amount that cannot be used to offset our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The application of the cash collateral cannot reduce the net derivative position below zero. Therefore, excess cash collateral, if any, is not reflected above.
Schedule of Effect of Cash Flow Hedges	The following table presents the effect, net of tax, of the cash flow hedges on OCI and on the Condensed Consolidated Statements of Comprehensive Income (Loss) for the three month periods presented: Amount of Loss Recognized in Other Comprehensive Income (Loss) Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Interest Income (dollars in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Derivatives in Cash Flow Hedging Relationships: Interest rate swap contracts - cash flow hedge $ (1,647) $ (13,256) $ (2,749) $ 222 Total $ (1,647) $ (13,256) $ (2,749) $ 222 The following table presents the effect, net of tax, of the cash flow hedges on OCI and on the Condensed Consolidated Statements of Comprehensive Income (Loss) for the nine month periods presented: Amount of Loss Recognized in Other Comprehensive Income (Loss) Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Interest Income (dollars in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Derivatives in Cash Flow Hedging Relationships: Interest rate swap contracts - cash flow hedge $ (3,399) $ (17,875) $ (6,958) $ 947 Total $ (3,399) $ (17,875) $ (6,958) $ 947
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 not designated as hedging instruments for the periods presented: Three months ended September 30, Nine months ended September 30, (dollars in thousands) 2023 2022 2023 2022 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ (851) $ 64 $ (851) $ 71 Interest rate lock commitments—mortgage loans — (58) (5) (404) Forward sale contracts—mortgage loans — 9 (2) 4 Total Derivatives (Loss) Gain $ (851) $ 15 $ (858) $ (329)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 December 31, 2022 Commitments to extend credit $ 2,697,493 $ 2,713,586 Standby letters of credit 53,061 64,356 Total $ 2,750,554 $ 2,777,942
Allowance for Credit Loss for Unfunded Loan Commitments	The following table presents activity in the allowance for credit losses on unfunded loan commitments for the periods presented: Three months ended September 30, Nine months ended September 30, (dollars in thousands) 2023 2022 2023 2022 Balance at beginning of period $ 9,946 $ 7,387 $ 8,196 $ 5,189 Provision for credit losses (661) 189 1,089 2,387 Total $ 9,285 $ 7,576 $ 9,285 $ 7,576

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Schedule of Tax Effects of Components of Other Comprehensive Income (Loss)	The following tables present the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended September 30, 2023 Three Months Ended September 30, 2022 (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 $ (12,977) $ 2,696 $ (10,281) $ (42,741) $ 9,121 $ (33,620) Change in interest rate swap (2,073) 426 (1,647) (16,852) 3,596 (13,256) Adjustment to funded status of employee benefit plans 440 (105) 335 (1,170) 250 (920) Other Comprehensive Income (Loss) $ (14,610) $ 3,017 $ (11,593) $ (60,763) $ 12,967 $ (47,796) Nine Months Ended September 30, 2023 Nine Months Ended September 30, 2022 (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 $ (13,107) $ 2,708 $ (10,399) $ (114,011) $ 24,325 $ (89,686) Change in interest rate swap (4,300) 902 (3,399) (22,724) 4,849 (17,875) Adjustment to funded status of employee benefit plans 365 (79) 287 (416) 100 (316) Other Comprehensive Income (Loss) $ (17,042) $ 3,531 $ (13,511) $ (137,151) $ 29,274 $ (107,877)

Share Repurchase Plan (Tables)

Share Repurchase Plan (Tables)	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Schedule of Repurchase Activity	The following table presents repurchase activity for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, (in thousands, except share and per share data) 2023 2022 2023 2022 Value of shares authorized to repurchase $ 50,000 $ 50,000 $ 50,000 $ 50,000 Remaining plan capacity at the beginning of the period $ 9,807 $ 33,289 $ 29,805 $ 37,442 Total shares repurchased — 117,283 739,426 268,503 Average share price for the period $ — $ 29.71 $ 27.05 $ 28.44 Total cost of repurchases (1) $ (1) $ 3,484 $ 19,998 $ 7,637 Remaining plan capacity at the end of the period $ 9,808 $ 29,805 $ 9,808 $ 29,805 (1) Includes excise tax on repurchases, net of issuances for restricted stock awards.

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss	$ 108,206	$ 105,757	$ 101,340	$ 99,694	$ 98,085	$ 98,576
Retained earnings	$ (935,162)		(863,948)
Impact of adopting ASU 2022-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss			568
Impact of adopting ASU 2022-02 | Accounting Standards Update 2022-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss			600
Retained earnings			$ 600

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator for Earnings per Share—Basic and Diluted:
Net income	$ 33,468	$ 37,249	$ 107,734	$ 95,250
Less: Income allocated to participating shares, basic	32	98	138	223
Less: Income allocated to participating shares, diluted	32	98	138	223
Net Income Allocated to Shareholders, basic	33,436	37,151	107,596	95,027
Net Income Allocated to Shareholders, diluted	$ 33,436	$ 37,151	$ 107,596	$ 95,027
Denominator for Earnings per Share—Basic:
Weighted Average Shares Outstanding—Basic (in shares)	38,174,804	38,937,771	38,514,617	39,030,325
Denominator for Earnings per Share—Two-Class Method—Diluted:
Weighted Average Shares Outstanding—Basic (in shares)	38,174,804	38,937,771	38,514,617	39,030,325
Add: Average participating shares outstanding (in shares)	161,212	37,374	154,347	18,826
Denominator for Two-Class Method—Diluted (in shares)	38,336,016	38,975,145	38,668,964	39,049,151
Earnings per share—basic (in dollars per share)	$ 0.88	$ 0.95	$ 2.79	$ 2.43
Earnings per share—diluted (in dollars per share)	$ 0.87	$ 0.95	$ 2.78	$ 2.43
Restricted Stock
Denominator for Earnings per Share—Two-Class Method—Diluted:
Restricted stock considered anti-dilutive excluded from potentially dilutive shares (in shares)	721	655	231	1,027

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Debt securities	$ 954,267	$ 1,001,784
Equity securities	995	994
Derivative financial assets	93,601	83,456
LIABILITIES
Derivative financial liabilities	120,106	104,817
U.S. Treasury securities
ASSETS
Debt securities	130,037	131,695
Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	42,049	41,811
Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	429,978	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	36,886	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	286,107	327,313
Obligations of states and political subdivisions
ASSETS
Debt securities	29,210	30,471
Fair Value Measurements, Recurring
ASSETS
Debt securities	954,267	1,001,784
Equity securities	995	994
Total Securities Available for Sale	955,262	1,002,778
Securities held in a deferred compensation plan	8,289	8,087
Total Assets	1,057,152	1,094,321
LIABILITIES
Total Liabilities	120,106	104,817
Fair Value Measurements, Recurring | U.S. Treasury securities
ASSETS
Debt securities	130,037	131,695
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	42,049	41,811
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	429,978	428,407
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	36,886	41,587
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	286,107	327,313
Fair Value Measurements, Recurring | Corporate obligations
ASSETS
Debt securities		500
Fair Value Measurements, Recurring | Obligations of states and political subdivisions
ASSETS
Debt securities	29,210	30,471
Fair Value Measurements, Recurring | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	93,601	83,449
LIABILITIES
Derivative financial liabilities	94,438	83,449
Fair Value Measurements, Recurring | Interest rate lock commitments
ASSETS
Derivative financial assets		5
Fair Value Measurements, Recurring | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		2
Fair Value Measurements, Recurring | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	25,668	21,368
Fair Value Measurements, Recurring | Level 1
ASSETS
Debt securities	130,037	131,695
Equity securities	923	952
Total Securities Available for Sale	130,960	132,647
Securities held in a deferred compensation plan	8,289	8,087
Total Assets	139,249	140,734
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities
ASSETS
Debt securities	130,037	131,695
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Corporate obligations
ASSETS
Debt securities		0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps - commercial loans
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
Fair Value Measurements, Recurring | Level 1 | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 2
ASSETS
Debt securities	824,230	870,089
Equity securities	72	42
Total Securities Available for Sale	824,302	870,131
Securities held in a deferred compensation plan	0	0
Total Assets	917,903	953,580
LIABILITIES
Total Liabilities	120,106	104,817
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	42,049	41,811
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	429,978	428,407
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	36,886	41,587
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	286,107	327,313
Fair Value Measurements, Recurring | Level 2 | Corporate obligations
ASSETS
Debt securities		500
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions
ASSETS
Debt securities	29,210	30,471
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	93,601	83,449
LIABILITIES
Derivative financial liabilities	94,438	83,449
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets		0
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		0
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	25,668	21,368
Fair Value Measurements, Recurring | Level 3
ASSETS
Debt securities	0	0
Equity securities	0	0
Total Securities Available for Sale	0	0
Securities held in a deferred compensation plan	0	0
Total Assets	0	7
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Corporate obligations
ASSETS
Debt securities		0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions
ASSETS
Debt securities	0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps - commercial loans
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		5
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts—mortgage loans
ASSETS
Derivative financial assets		2
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	$ 0	$ 0

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 3,715,000	$ 3,065,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned		3,100,000
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a nonrecurring basis	0	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 0	$ 0

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Securities available for sale	$ 955,262	$ 1,002,778
Portfolio loans, net	7,407,712	7,082,629
Derivative financial assets	93,601	83,456
LIABILITIES
Junior subordinated debt securities	49,343	54,453
Derivative financial liabilities	120,106	104,817
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	238,453	210,009
Securities available for sale	955,262	1,002,778
Loans held for sale	257	16
Portfolio loans, net	7,407,712	7,082,629
Collateral receivable	10,506	6,307
Securities held in a deferred compensation plan	8,289	8,087
Mortgage servicing rights	6,534	7,147
LIABILITIES
Deposits	7,222,897	7,219,970
Collateral payable	77,049	65,065
Short-term borrowings	630,000	370,000
Long-term borrowings	39,396	14,741
Junior subordinated debt securities	49,343	54,453
Carrying Value | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	93,601
LIABILITIES
Derivative financial liabilities	94,438	83,449
Carrying Value | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	25,668	21,368
Carrying Value | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		83,449
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets		5
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets		2
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits	238,453	210,009
Securities available for sale	955,262	1,002,778
Loans held for sale	257	16
Portfolio loans, net	7,059,741	6,815,167
Collateral receivable	10,506	6,307
Securities held in a deferred compensation plan	8,289	8,087
Mortgage servicing rights	9,411	9,994
LIABILITIES
Deposits	7,205,014	7,194,225
Collateral payable	77,049	65,065
Short-term borrowings	630,000	370,000
Long-term borrowings	38,983	14,174
Junior subordinated debt securities	49,343	54,453
Fair Value Measurements | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	93,601
LIABILITIES
Derivative financial liabilities	94,438	83,449
Fair Value Measurements | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	25,668	21,368
Fair Value Measurements | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		83,449
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets		5
Fair Value Measurements | Forward sale contracts
ASSETS
Derivative financial assets		2
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits	238,453	210,009
Securities available for sale	130,960	132,647
Loans held for sale	0	0
Portfolio loans, net	0	0
Collateral receivable	10,506	6,307
Securities held in a deferred compensation plan	8,289	8,087
Mortgage servicing rights	0	0
LIABILITIES
Deposits	5,735,018	6,285,377
Collateral payable	77,049	65,065
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated debt securities	0	0
Fair Value Measurements | Level 1 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 1 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 1 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 1 | Forward sale contracts
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities available for sale	824,302	870,131
Loans held for sale	257	16
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	1,469,996	908,848
Collateral payable	0	0
Short-term borrowings	630,000	370,000
Long-term borrowings	38,983	14,174
Junior subordinated debt securities	49,343	54,453
Fair Value Measurements | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets	93,601
LIABILITIES
Derivative financial liabilities	94,438	83,449
Fair Value Measurements | Level 2 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	25,668	21,368
Fair Value Measurements | Level 2 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		83,449
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	0	0
Securities available for sale		0
Loans held for sale	0	0
Portfolio loans, net	7,059,741	6,815,167
Collateral receivable	0	0
Securities held in a deferred compensation plan	0	0
Mortgage servicing rights	9,411	9,994
LIABILITIES
Deposits	0	0
Collateral payable	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 - commercial loans
ASSETS
Derivative financial assets	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements | Level 3 | Interest rate swaps - cash flow hedge
LIABILITIES
Derivative financial liabilities	$ 0	0
Fair Value Measurements | Level 3 | Interest rate swaps - commercial loans
ASSETS
Derivative financial assets		0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets		5
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets		$ 2

Securities - Fair Values of Mar

Securities - Fair Values of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Debt securities	$ 954,267	$ 1,001,784
Equity securities	995	994
Total Securities Available for Sale	$ 955,262	$ 1,002,778

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,069,695	$ 1,104,105
Gross Unrealized Gains	0	261
Gross Unrealized Losses	(115,428)	(102,582)
Fair Value	954,267	1,001,784
Interest receivable	3,400	3,700
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	144,575	145,416
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(14,538)	(13,721)
Fair Value	130,037	131,695
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,377	43,479
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,328)	(1,668)
Fair Value	42,049	41,811
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	493,359	482,039
Gross Unrealized Gains	0	203
Gross Unrealized Losses	(63,381)	(53,835)
Fair Value	429,978	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,802	49,418
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(8,916)	(7,834)
Fair Value	36,886	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	312,191	352,465
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26,084)	(25,152)
Fair Value	286,107	327,313
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	500
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	30,391	30,788
Gross Unrealized Gains	0	55
Gross Unrealized Losses	(1,181)	(372)
Fair Value	$ 29,210	$ 30,471

Securities - Fair Value and Age

Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	28	116
Fair Value, Less Than 12 Months	$ 136,557	$ 663,656
Unrealized Losses, Less Than 12 Months	$ (4,384)	$ (46,120)
Number of Securities, 12 Months or More | security	121	31
Fair Value, 12 Months or More	$ 817,710	$ 308,067
Unrealized Losses, 12 Months or More	$ (111,044)	$ (56,462)
Number of Securities, Total | security	149	147
Fair Value, Total	$ 954,267	$ 971,723
Unrealized Losses, Total	$ (115,428)	$ (102,582)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	1	6
Fair Value, Less Than 12 Months	$ 9,895	$ 57,057
Unrealized Losses, Less Than 12 Months	$ (203)	$ (3,363)
Number of Securities, 12 Months or More | security	13	8
Fair Value, 12 Months or More	$ 120,142	$ 74,638
Unrealized Losses, 12 Months or More	$ (14,335)	$ (10,358)
Number of Securities, Total | security	14	14
Fair Value, Total	$ 130,037	$ 131,695
Unrealized Losses, Total	$ (14,538)	$ (13,721)
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	0	6
Fair Value, Less Than 12 Months	$ 0	$ 41,811
Unrealized Losses, Less Than 12 Months	$ 0	$ (1,668)
Number of Securities, 12 Months or More | security	6	0
Fair Value, 12 Months or More	$ 42,049	$ 0
Unrealized Losses, 12 Months or More	$ (1,328)	$ 0
Number of Securities, Total | security	6	6
Fair Value, Total	$ 42,049	$ 41,811
Unrealized Losses, Total	$ (1,328)	$ (1,668)
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	8	47
Fair Value, Less Than 12 Months	$ 78,608	$ 296,509
Unrealized Losses, Less Than 12 Months	$ (2,402)	$ (28,153)
Number of Securities, 12 Months or More | security	57	13
Fair Value, 12 Months or More	$ 351,370	$ 112,902
Unrealized Losses, 12 Months or More	$ (60,979)	$ (25,682)
Number of Securities, Total | security	65	60
Fair Value, Total	$ 429,978	$ 409,411
Unrealized Losses, Total	$ (63,381)	$ (53,835)
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	12	25
Fair Value, Less Than 12 Months	$ 319	$ 7,143
Unrealized Losses, Less Than 12 Months	$ (7)	$ (589)
Number of Securities, 12 Months or More | security	14	3
Fair Value, 12 Months or More	$ 36,567	$ 34,223
Unrealized Losses, 12 Months or More	$ (8,909)	$ (7,245)
Number of Securities, Total | security	26	28
Fair Value, Total	$ 36,886	$ 41,366
Unrealized Losses, Total	$ (8,916)	$ (7,834)
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	2	30
Fair Value, Less Than 12 Months	$ 18,525	$ 241,009
Unrealized Losses, Less Than 12 Months	$ (591)	$ (11,975)
Number of Securities, 12 Months or More | security	31	7
Fair Value, 12 Months or More	$ 267,582	$ 86,304
Unrealized Losses, 12 Months or More	$ (25,493)	$ (13,177)
Number of Securities, Total | security	33	37
Fair Value, Total	$ 286,107	$ 327,313
Unrealized Losses, Total	$ (26,084)	$ (25,152)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Number of Securities, Less Than 12 Months | security	5	2
Fair Value, Less Than 12 Months	$ 29,210	$ 20,127
Unrealized Losses, Less Than 12 Months	$ (1,181)	$ (372)
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	5	2
Fair Value, Total	$ 29,210	$ 20,127
Unrealized Losses, Total	$ (1,181)	$ (372)

Securities - Narrative (Details

Securities - Narrative (Details) $ in Thousands	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of debt securities in unrealized loss position | security	149	147
Debt securities	$ 954,267	$ 1,001,784
Asset Pledged as Collateral without Right
Debt Securities, Available-for-sale [Line Items]
Debt securities	18,300	17,900
Asset Pledged as Collateral with Right
Debt Securities, Available-for-sale [Line Items]
Debt securities	$ 213,200	$ 251,500

Securities - Unrealized Gains (

Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Gains	$ 0	$ 261
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Losses	(115,428)	(102,582)
Total unrealized gains/(losses) on debt securities available-for-sale, Net Unrealized Gains/(Losses)	(115,428)	(102,321)
Income tax (expense) benefit, Gross Unrealized Gains	0	(56)
Income tax (expense) benefit, Gross Unrealized Losses	24,567	21,915
Income tax (expense) benefit, Net Unrealized Gains/(Losses)	24,567	21,859
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Gains	0	205
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Gross Unrealized Losses	(90,861)	(80,667)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss), Net Unrealized Gains/(Losses)	$ (90,861)	$ (80,462)

Securities - Contractual Maturi

Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 28,010
Due after one year through five years	162,599
Due after five years through ten years	16,357
Due after ten years	11,377
Available-for-Sale Debt Securities With Maturities, Amortized Cost	218,343
Amortized Cost	1,069,695	$ 1,104,105
Fair Value
Due in one year or less	27,485
Due after one year through five years	147,194
Due after five years through ten years	15,835
Due after ten years	10,782
Available-for-Sale Debt Securities With Maturities, Fair Value	201,296
Total Available-for-Sale Debt Securities, Fair Value	954,267	1,001,784
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	493,359
Amortized Cost	493,359	482,039
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	429,978
Total Available-for-Sale Debt Securities, Fair Value	429,978	428,407
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	45,802
Amortized Cost	45,802	49,418
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	36,886
Total Available-for-Sale Debt Securities, Fair Value	36,886	41,587
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Fixed Maturities	312,191
Amortized Cost	312,191	352,465
Fair Value
Available-for-Sale Debt Securities With Fixed Maturities	286,107
Total Available-for-Sale Debt Securities, Fair Value	$ 286,107	$ 327,313

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($) loan	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($) loan	Dec. 31, 2022 USD ($) loan
Receivables [Abstract]
Unearned income	$ 7.1		$ 7.1		$ 7.5
Purchase accounting fair value adjustments	$ 3.6		$ 3.6		$ 4.7
Number of contracts, modified, subsequent default | loan	0	7	0	23
Financing receivable, modified, commitment to lend	$ 0.2		$ 0.2
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 | loan					1
Reclassified to accruing status					$ 0.2
Number of commitments to lend additional funds on TDRs | loan		16		16
Commitments to lend additional funds on TDRs		$ 0.4		$ 0.4
Number of contracts, troubled debt restructuring, subsequent default | loan		1		2
Financing receivable, modified, subsequent default		$ 0.1		$ 0.2

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Composition of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Composition of the loans
Portfolio loans, net of unearned income	$ 7,515,918	$ 7,183,969
Loans held for sale	257	16
Total Loans	7,516,175	7,183,985
Interest receivable	34,200	28,300
Commercial Loans | Commercial real estate
Composition of the loans
Portfolio loans, net of unearned income	2,591,189	2,538,839
Commercial Loans | Commercial and industrial
Composition of the loans
Portfolio loans, net of unearned income	1,424,141	1,510,392
Commercial Loans | Commercial construction
Composition of the loans
Portfolio loans, net of unearned income	372,839	381,963
Business Banking
Composition of the loans
Portfolio loans, net of unearned income	1,363,314	1,205,944
Consumer Loans | Consumer real estate
Composition of the loans
Portfolio loans, net of unearned income	1,649,056	1,421,953
Consumer Loans | Other consumer
Composition of the loans
Portfolio loans, net of unearned income	$ 115,379	$ 124,878

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Amortized Cost of Loans to Borrowers, Modified (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 6,347	$ 181	$ 22,918	$ 2,077
% of Portfolio Segment	0.08%		0.30%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 6,347	0	$ 22,727	862
Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0		191
Commercial Loans | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0	0	$ 13,505	0
% of Portfolio Segment	0%		0.52%
Commercial Loans | Commercial real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0	0	$ 13,505	0
Commercial Loans | Commercial real estate | Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0		0
Commercial Loans | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 6,347	0	$ 6,892	0
% of Portfolio Segment	0.45%		0.48%
Commercial Loans | Commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 6,347	0	$ 6,892	0
Commercial Loans | Commercial and industrial | Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0		0
Commercial Loans | Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0	0	$ 1,610	0
% of Portfolio Segment	0%		0.43%
Commercial Loans | Commercial construction | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0	0	$ 1,610	0
Commercial Loans | Commercial construction | Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0		0
Business Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0		$ 658
% of Portfolio Segment	0%		0.05%
Business Banking | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0		$ 658
Business Banking | Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0		0
Consumer Loans | Consumer real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0	172	$ 253	2,066
% of Portfolio Segment	0%		0.02%
Consumer Loans | Consumer real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0	$ 0	$ 62	$ 862
Consumer Loans | Consumer real estate | Term Extension and Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 0		$ 191

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Financial Impact of Modifications (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Commercial Loans | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in Months)	0 months	7 months
Weighted-Average Interest Rate Reduction	0%	0%
Commercial Loans | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in Months)	2 months	6 months
Weighted-Average Interest Rate Reduction	0%	0%
Commercial Loans | Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in Months)	0 months	5 months
Weighted-Average Interest Rate Reduction	0%	0%
Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in Months)	0 months	5 months
Weighted-Average Interest Rate Reduction	0%	0%
Consumer Loans | Consumer real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-Average Term Extension (in Months)	0 months	168 months
Weighted-Average Interest Rate Reduction	0%	2%

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Summary of Aging Analysis of Modifications (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	$ 22,918
Current | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	20,801
30-59 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	1,610
60-89 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	62
90+ Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	445
Commercial Loans | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	13,505
Commercial Loans | Commercial real estate | Current | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	13,505
Commercial Loans | Commercial real estate | 30-59 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Commercial Loans | Commercial real estate | 60-89 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Commercial Loans | Commercial real estate | 90+ Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Commercial Loans | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	6,892
Commercial Loans | Commercial and industrial | Current | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	6,447
Commercial Loans | Commercial and industrial | 30-59 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Commercial Loans | Commercial and industrial | 60-89 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Commercial Loans | Commercial and industrial | 90+ Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	445
Commercial Loans | Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	1,610
Commercial Loans | Commercial construction | Current | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Commercial Loans | Commercial construction | 30-59 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	1,610
Commercial Loans | Commercial construction | 60-89 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Commercial Loans | Commercial construction | 90+ Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	658
Business banking | Current | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	658
Business banking | 30-59 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Business banking | 60-89 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Business banking | 90+ Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Consumer Loans | Consumer real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	253
Consumer Loans | Consumer real estate | Current | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	191
Consumer Loans | Consumer real estate | 30-59 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	0
Consumer Loans | Consumer real estate | 60-89 Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	62
Consumer Loans | Consumer real estate | 90+ Days Past Due | Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified, after 12 months	$ 0

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Summary of Restructured Loans (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 11,785
Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0
Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	626
Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	1,655
Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	1,525
Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	7,966
Other consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	13
Accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	8,891
Accrual | Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0
Accrual | Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	626
Accrual | Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	1,655
Accrual | Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	438
Accrual | Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	6,168
Accrual | Other consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	4
Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	2,894
Nonaccrual | Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0
Nonaccrual | Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0
Nonaccrual | Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	0
Nonaccrual | Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	1,087
Nonaccrual | Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	1,798
Nonaccrual | Other consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable, modified in period	$ 9

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Restructured Loans by Type of Concession (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($) loan	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	7	0	23
Post-Modification Outstanding Recorded Investment	$ 6,347	$ 181	$ 22,918	$ 2,077
Pre-Modification Outstanding Recorded Investment		185		2,545
Bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		181		1,215
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Extend Maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	6,347	0	22,727	862
Modify Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Modify Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0		$ 0
Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan		0		0
Post-Modification Outstanding Recorded Investment	0	$ 0	13,505	$ 0
Pre-Modification Outstanding Recorded Investment		0		0
Commercial real estate | Bankruptcy | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial real estate | Other | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial real estate | Extend Maturity | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	0	0	13,505	0
Commercial real estate | Modify Rate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial real estate | Modify Payments | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0		$ 0
Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan		0		0
Post-Modification Outstanding Recorded Investment	6,347	$ 0	6,892	$ 0
Pre-Modification Outstanding Recorded Investment		0		0
Commercial and industrial | Bankruptcy | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial and industrial | Other | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial and industrial | Extend Maturity | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	6,347	0	6,892	0
Commercial and industrial | Modify Rate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial and industrial | Modify Payments | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0		$ 0
Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan		0		0
Post-Modification Outstanding Recorded Investment	0	$ 0	1,610	$ 0
Pre-Modification Outstanding Recorded Investment		0		0
Commercial construction | Bankruptcy | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial construction | Other | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial construction | Extend Maturity | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	0	0	1,610	0
Commercial construction | Modify Rate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Commercial construction | Modify Payments | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0		$ 0
Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan		0		0
Post-Modification Outstanding Recorded Investment		$ 0		$ 0
Pre-Modification Outstanding Recorded Investment		0		0
Business banking | Bankruptcy | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Business banking | Other | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Business banking | Extend Maturity | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Business banking | Modify Rate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Business banking | Modify Payments | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0		$ 0
Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan		6		21
Post-Modification Outstanding Recorded Investment	0	$ 172	253	$ 2,066
Pre-Modification Outstanding Recorded Investment		173		2,530
Consumer real estate | Bankruptcy | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		172		1,204
Consumer real estate | Other | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Consumer real estate | Extend Maturity | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	$ 0	0	$ 62	862
Consumer real estate | Modify Rate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Consumer real estate | Modify Payments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0		$ 0
Other consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan		1		2
Post-Modification Outstanding Recorded Investment		$ 9		$ 11
Pre-Modification Outstanding Recorded Investment		12		15
Other consumer | Bankruptcy | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		9		11
Other consumer | Other | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Other consumer | Extend Maturity | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Other consumer | Modify Rate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		0		0
Other consumer | Modify Payments | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment		$ 0		$ 0

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Nonperforming Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Nonperforming Assets
Nonaccrual Loans	$ 12,677	$ 19,052	$ 66,291
OREO	3,715	3,065
Total Nonperforming Assets	$ 16,392	$ 22,117

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Total Loan Balance
Current fiscal year	$ 875,940		$ 875,940		$ 1,271,764
Year two	1,301,309		1,301,309		1,214,107
Year three	1,118,263		1,118,263		586,544
Year four	513,435		513,435		725,517
Year five	668,747		668,747		449,759
More than five years	1,712,993		1,712,993		1,528,088
Revolving	1,295,848		1,295,848		1,381,517
Revolving-Term	29,383		29,383		26,673
Total	7,515,918		7,515,918		7,183,969
Current Year-to-date Gross Charge-offs
2023			551
2022			184
2021			191
2020			14
2019			3,529
2018 and Prior			12,874
Revolving			3,143
Revolving-Term			272
Total	4,077	$ 1,239	20,758	$ 9,899
Pass
Total Loan Balance
Current fiscal year	875,940		875,940		1,271,177
Year two	1,300,179		1,300,179		1,177,280
Year three	1,084,087		1,084,087		581,879
Year four	508,448		508,448		677,616
Year five	601,689		601,689		406,053
More than five years	1,493,661		1,493,661		1,313,942
Revolving	1,254,281		1,254,281		1,348,200
Revolving-Term	25,877		25,877		23,596
Total	7,144,162		7,144,162		6,799,743
Special mention
Total Loan Balance
Current fiscal year	0		0		0
Year two	651		651		36,547
Year three	17,961		17,961		146
Year four	3,023		3,023		26,394
Year five	38,236		38,236		24,765
More than five years	118,879		118,879		113,071
Revolving	15,396		15,396		20,073
Revolving-Term	179		179		95
Total	194,325		194,325		221,091
Substandard
Total Loan Balance
Current fiscal year	0		0		587
Year two	479		479		280
Year three	16,215		16,215		4,519
Year four	1,964		1,964		21,507
Year five	28,822		28,822		18,941
More than five years	100,453		100,453		101,043
Revolving	26,171		26,171		13,244
Revolving-Term	3,327		3,327		2,982
Total	177,431		177,431		163,103
Doubtful
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		32
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		32
Commercial Loans | Commercial real estate
Total Loan Balance
Current fiscal year	221,775		221,775		292,732
Year two	268,261		268,261		360,423
Year three	422,345		422,345		269,049
Year four	245,339		245,339		449,493
Year five	426,370		426,370		261,941
More than five years	971,630		971,630		883,535
Revolving	35,469		35,469		21,666
Revolving-Term	0		0		0
Total	2,591,189		2,591,189		2,538,839
Current Year-to-date Gross Charge-offs
2023			0
2022			0
2021			0
2020			0
2019			0
2018 and Prior			0
Revolving			0
Revolving-Term			0
Total	0	628	0	827
Commercial Loans | Commercial and industrial
Total Loan Balance
Current fiscal year	143,170		143,170		253,696
Year two	235,058		235,058		289,448
Year three	224,893		224,893		88,544
Year four	58,238		58,238		73,998
Year five	59,273		59,273		65,911
More than five years	184,340		184,340		147,273
Revolving	519,169		519,169		591,522
Revolving-Term	0		0		0
Total	1,424,141		1,424,141		1,510,392
Current Year-to-date Gross Charge-offs
2023			0
2022			0
2021			0
2020			0
2019			3,412
2018 and Prior			11,808
Revolving			3,033
Revolving-Term			0
Total	3,033	0	18,253	5,797
Commercial Loans | Commercial construction
Total Loan Balance
Current fiscal year	44,519		44,519		120,655
Year two	188,037		188,037		170,691
Year three	97,525		97,525		40,762
Year four	13,266		13,266		14,442
Year five	10,815		10,815		3,953
More than five years	6,202		6,202		4,176
Revolving	12,475		12,475		27,284
Revolving-Term	0		0		0
Total	372,839		372,839		381,963
Current Year-to-date Gross Charge-offs
2023			0
2022			0
2021			0
2020			0
2019			0
2018 and Prior			0
Revolving			0
Revolving-Term			0
Total	0	0	0	0
Commercial Loans | Business banking
Total Loan Balance
Current fiscal year	230,663		230,663		287,679
Year two	270,110		270,110		233,723
Year three	216,729		216,729		91,149
Year four	91,167		91,167		109,731
Year five	102,761		102,761		84,889
More than five years	351,469		351,469		292,211
Revolving	98,585		98,585		105,271
Revolving-Term	1,830		1,830		1,291
Total	1,363,314		1,363,314		1,205,944
Current Year-to-date Gross Charge-offs
2023			0
2022			67
2021			43
2020			1
2019			88
2018 and Prior			1,018
Revolving			35
Revolving-Term			0
Total	590	178	1,252	1,924
Commercial Loans | Pass | Commercial real estate
Total Loan Balance
Current fiscal year	221,775		221,775		292,732
Year two	268,261		268,261		360,423
Year three	416,345		416,345		267,743
Year four	242,965		242,965		422,872
Year five	377,358		377,358		227,006
More than five years	785,748		785,748		704,600
Revolving	35,469		35,469		21,666
Revolving-Term	0		0		0
Total	2,347,921		2,347,921		2,297,042
Commercial Loans | Pass | Commercial and industrial
Total Loan Balance
Current fiscal year	143,170		143,170		253,324
Year two	234,153		234,153		264,012
Year three	199,719		199,719		88,544
Year four	56,549		56,549		63,190
Year five	53,214		53,214		62,874
More than five years	173,188		173,188		138,250
Revolving	478,363		478,363		559,777
Revolving-Term	0		0		0
Total	1,338,356		1,338,356		1,429,971
Commercial Loans | Pass | Commercial construction
Total Loan Balance
Current fiscal year	44,519		44,519		120,655
Year two	188,037		188,037		159,737
Year three	97,525		97,525		40,762
Year four	13,266		13,266		6,338
Year five	2,575		2,575		3,953
More than five years	4,368		4,368		2,297
Revolving	12,475		12,475		27,284
Revolving-Term	0		0		0
Total	362,765		362,765		361,026
Commercial Loans | Pass | Business banking
Total Loan Balance
Current fiscal year	230,663		230,663		287,520
Year two	270,093		270,093		233,499
Year three	213,953		213,953		87,926
Year four	90,386		90,386		107,819
Year five	99,541		99,541		80,549
More than five years	337,456		337,456		276,843
Revolving	98,434		98,434		104,354
Revolving-Term	781		781		645
Total	1,341,307		1,341,307		1,179,155
Commercial Loans | Special mention | Commercial real estate
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	6,000		6,000		0
Year four	1,107		1,107		13,187
Year five	38,236		38,236		20,090
More than five years	106,995		106,995		101,112
Revolving	0		0		0
Revolving-Term	0		0		0
Total	152,338		152,338		134,389
Commercial Loans | Special mention | Commercial and industrial
Total Loan Balance
Current fiscal year	0		0		0
Year two	651		651		25,436
Year three	11,698		11,698		0
Year four	1,689		1,689		5,103
Year five	0		0		1,885
More than five years	8,461		8,461		7,132
Revolving	15,359		15,359		19,280
Revolving-Term	0		0		0
Total	37,858		37,858		58,836
Commercial Loans | Special mention | Commercial construction
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		10,954
Year three	0		0		0
Year four	0		0		8,104
Year five	0		0		0
More than five years	0		0		0
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		19,058
Commercial Loans | Special mention | Business banking
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		157
Year three	263		263		146
Year four	227		227		0
Year five	0		0		2,790
More than five years	3,307		3,307		3,945
Revolving	37		37		793
Revolving-Term	179		179		95
Total	4,013		4,013		7,926
Commercial Loans | Substandard | Commercial real estate
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		1,306
Year four	1,267		1,267		13,434
Year five	10,776		10,776		14,845
More than five years	78,887		78,887		77,823
Revolving	0		0		0
Revolving-Term	0		0		0
Total	90,930		90,930		107,408
Commercial Loans | Substandard | Commercial and industrial
Total Loan Balance
Current fiscal year	0		0		372
Year two	254		254		0
Year three	13,476		13,476		0
Year four	0		0		5,705
Year five	6,059		6,059		1,152
More than five years	2,691		2,691		1,891
Revolving	25,447		25,447		12,465
Revolving-Term	0		0		0
Total	47,927		47,927		21,585
Commercial Loans | Substandard | Commercial construction
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	8,240		8,240		0
More than five years	1,834		1,834		1,879
Revolving	0		0		0
Revolving-Term	0		0		0
Total	10,074		10,074		1,879
Commercial Loans | Substandard | Business banking
Total Loan Balance
Current fiscal year	0		0		159
Year two	17		17		67
Year three	2,513		2,513		3,077
Year four	554		554		1,912
Year five	3,220		3,220		1,550
More than five years	10,706		10,706		11,391
Revolving	114		114		124
Revolving-Term	870		870		551
Total	17,994		17,994		18,831
Commercial Loans | Doubtful | Commercial real estate
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		0
Commercial Loans | Doubtful | Commercial and industrial
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		0
Commercial Loans | Doubtful | Commercial construction
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		0
Commercial Loans | Doubtful | Business banking
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		32
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		32
Consumer Loans | Consumer real estate
Total Loan Balance
Current fiscal year	225,529		225,529		296,948
Year two	326,707		326,707		149,003
Year three	149,242		149,242		91,613
Year four	101,938		101,938		74,583
Year five	67,984		67,984		32,031
More than five years	198,475		198,475		200,169
Revolving	554,347		554,347		553,649
Revolving-Term	24,834		24,834		23,957
Total	1,649,056		1,649,056		1,421,953
Current Year-to-date Gross Charge-offs
2023			0
2022			1
2021			0
2020			5
2019			1
2018 and Prior			43
Revolving			75
Revolving-Term			99
Total	107	161	224	299
Consumer Loans | Other consumer
Total Loan Balance
Current fiscal year	10,284		10,284		20,054
Year two	13,136		13,136		10,819
Year three	7,529		7,529		5,427
Year four	3,487		3,487		3,270
Year five	1,544		1,544		1,034
More than five years	877		877		724
Revolving	75,803		75,803		82,125
Revolving-Term	2,719		2,719		1,425
Total	115,379		115,379		124,878
Current Year-to-date Gross Charge-offs
2023			551
2022			116
2021			148
2020			8
2019			28
2018 and Prior			5
Revolving			0
Revolving-Term			173
Total	347	$ 272	1,029	$ 1,052
Consumer Loans | Pass | Consumer real estate
Total Loan Balance
Current fiscal year	225,529		225,529		296,900
Year two	326,499		326,499		148,790
Year three	149,042		149,042		91,477
Year four	101,799		101,799		74,155
Year five	67,478		67,478		30,658
More than five years	192,173		192,173		191,228
Revolving	553,737		553,737		552,994
Revolving-Term	22,393		22,393		21,547
Total	1,638,650		1,638,650		1,407,749
Consumer Loans | Pass | Other consumer
Total Loan Balance
Current fiscal year	10,284		10,284		20,046
Year two	13,136		13,136		10,819
Year three	7,503		7,503		5,427
Year four	3,483		3,483		3,242
Year five	1,523		1,523		1,013
More than five years	728		728		724
Revolving	75,803		75,803		82,125
Revolving-Term	2,703		2,703		1,404
Total	115,163		115,163		124,800
Consumer Loans | Special mention | Consumer real estate
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	116		116		882
Revolving	0		0		0
Revolving-Term	0		0		0
Total	116		116		882
Consumer Loans | Special mention | Other consumer
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		0
Consumer Loans | Substandard | Consumer real estate
Total Loan Balance
Current fiscal year	0		0		48
Year two	208		208		213
Year three	200		200		136
Year four	139		139		428
Year five	506		506		1,373
More than five years	6,186		6,186		8,059
Revolving	610		610		655
Revolving-Term	2,441		2,441		2,410
Total	10,290		10,290		13,322
Consumer Loans | Substandard | Other consumer
Total Loan Balance
Current fiscal year	0		0		8
Year two	0		0		0
Year three	26		26		0
Year four	4		4		28
Year five	21		21		21
More than five years	149		149		0
Revolving	0		0		0
Revolving-Term	16		16		21
Total	216		216		78
Consumer Loans | Doubtful | Consumer real estate
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving	0		0		0
Revolving-Term	0		0		0
Total	0		0		0
Consumer Loans | Doubtful | Other consumer
Total Loan Balance
Current fiscal year	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving	0		0		0
Revolving-Term	0		0		0
Total	$ 0		$ 0		$ 0

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 875,940	$ 1,271,764
Year two	1,301,309	1,214,107
Year three	1,118,263	586,544
Year four	513,435	725,517
Year five	668,747	449,759
More than five years	1,712,993	1,528,088
Revolving	1,295,848	1,381,517
Revolving-Term	29,383	26,673
Total	7,515,918	7,183,969
Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	875,940	1,271,764
Year two	1,300,933	1,213,905
Year three	1,118,219	585,892
Year four	513,157	724,629
Year five	667,958	448,121
More than five years	1,704,170	1,513,912
Revolving	1,295,410	1,380,980
Revolving-Term	27,454	25,714
Total	7,503,241	7,164,917
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	376	202
Year three	44	652
Year four	278	888
Year five	789	1,638
More than five years	8,823	14,176
Revolving	438	537
Revolving-Term	1,929	959
Total	12,677	19,052
Commercial Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	221,775	292,732
Year two	268,261	360,423
Year three	422,345	269,049
Year four	245,339	449,493
Year five	426,370	261,941
More than five years	971,630	883,535
Revolving	35,469	21,666
Revolving-Term	0	0
Total	2,591,189	2,538,839
Commercial Loans | Commercial real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	221,775	292,732
Year two	268,261	360,423
Year three	422,345	269,049
Year four	245,339	449,493
Year five	426,370	261,941
More than five years	970,368	876,435
Revolving	35,469	21,666
Revolving-Term	0	0
Total	2,589,927	2,531,739
Commercial Loans | Commercial real estate | Nonaccrual
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	1,262	7,100
Revolving	0	0
Revolving-Term	0	0
Total	1,262	7,100
Commercial Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	143,170	253,696
Year two	235,058	289,448
Year three	224,893	88,544
Year four	58,238	73,998
Year five	59,273	65,911
More than five years	184,340	147,273
Revolving	519,169	591,522
Revolving-Term	0	0
Total	1,424,141	1,510,392
Commercial Loans | Commercial and industrial | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	143,170	253,696
Year two	235,058	289,448
Year three	224,893	88,544
Year four	58,238	73,998
Year five	59,273	65,858
More than five years	183,651	147,273
Revolving	518,939	591,292
Revolving-Term	0	0
Total	1,423,222	1,510,109
Commercial Loans | Commercial and industrial | Nonaccrual
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	53
More than five years	689	0
Revolving	230	230
Revolving-Term	0	0
Total	919	283
Commercial Loans | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	44,519	120,655
Year two	188,037	170,691
Year three	97,525	40,762
Year four	13,266	14,442
Year five	10,815	3,953
More than five years	6,202	4,176
Revolving	12,475	27,284
Revolving-Term	0	0
Total	372,839	381,963
Commercial Loans | Commercial construction | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	44,519	120,655
Year two	188,037	170,691
Year three	97,525	40,762
Year four	13,266	14,442
Year five	10,815	3,953
More than five years	5,818	3,792
Revolving	12,475	27,284
Revolving-Term	0	0
Total	372,455	381,579
Commercial Loans | Commercial construction | Nonaccrual
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	384	384
Revolving	0	0
Revolving-Term	0	0
Total	384	384
Commercial Loans | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	230,663	287,679
Year two	270,110	233,723
Year three	216,729	91,149
Year four	91,167	109,731
Year five	102,761	84,889
More than five years	351,469	292,211
Revolving	98,585	105,271
Revolving-Term	1,830	1,291
Total	1,363,314	1,205,944
Commercial Loans | Business banking | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	230,663	287,679
Year two	270,110	233,656
Year three	216,729	91,149
Year four	91,128	109,479
Year five	102,469	83,689
More than five years	347,909	289,435
Revolving	98,585	105,172
Revolving-Term	1,711	1,195
Total	1,359,304	1,201,454
Commercial Loans | Business banking | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	67
Year three	0	0
Year four	39	252
Year five	292	1,200
More than five years	3,560	2,776
Revolving	0	99
Revolving-Term	119	96
Total	4,010	4,490
Consumer Loans | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	225,529	296,948
Year two	326,707	149,003
Year three	149,242	91,613
Year four	101,938	74,583
Year five	67,984	32,031
More than five years	198,475	200,169
Revolving	554,347	553,649
Revolving-Term	24,834	23,957
Total	1,649,056	1,421,953
Consumer Loans | Consumer real estate | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	225,529	296,948
Year two	326,331	148,868
Year three	149,205	91,085
Year four	101,895	73,947
Year five	67,487	31,646
More than five years	195,678	196,384
Revolving	554,139	553,441
Revolving-Term	23,024	23,108
Total	1,643,288	1,415,427
Consumer Loans | Consumer real estate | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	376	135
Year three	37	528
Year four	43	636
Year five	497	385
More than five years	2,797	3,785
Revolving	208	208
Revolving-Term	1,810	849
Total	5,768	6,526
Consumer Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	10,284	20,054
Year two	13,136	10,819
Year three	7,529	5,427
Year four	3,487	3,270
Year five	1,544	1,034
More than five years	877	724
Revolving	75,803	82,125
Revolving-Term	2,719	1,425
Total	115,379	124,878
Consumer Loans | Other consumer | Accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	10,284	20,054
Year two	13,136	10,819
Year three	7,522	5,303
Year four	3,291	3,270
Year five	1,544	1,034
More than five years	746	593
Revolving	75,803	82,125
Revolving-Term	2,719	1,411
Total	115,045	124,609
Consumer Loans | Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	7	124
Year four	196	0
Year five	0	0
More than five years	131	131
Revolving	0	0
Revolving-Term	0	14
Total	$ 334	$ 269

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total	$ 7,515,918	$ 7,183,969
Nonaccrual	12,677	19,052	$ 66,291
Current
Financing Receivable, Past Due [Line Items]
Total	7,488,899	7,144,576
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Total	27,019	39,393
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	10,328	18,093
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	4,014	2,248
Commercial Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,591,189	2,538,839
Nonaccrual	1,262	7,100	31,488
Commercial Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,424,141	1,510,392
Nonaccrual	919	283	15,239
Commercial Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	372,839	381,963
Nonaccrual	384	384	2,471
Commercial Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,363,314	1,205,944
Nonaccrual	4,010	4,490	9,641
Commercial Loans | Current | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	2,589,832	2,523,315
Commercial Loans | Current | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,423,222	1,505,805
Commercial Loans | Current | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	366,269	381,579
Commercial Loans | Current | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,356,627	1,199,586
Commercial Loans | Total Past Due Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	1,357	15,524
Commercial Loans | Total Past Due Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	919	4,587
Commercial Loans | Total Past Due Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	6,570	384
Commercial Loans | Total Past Due Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total	6,687	6,358
Commercial Loans | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	0	8,424
Commercial Loans | 30-59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	4,304
Commercial Loans | 30-59 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	6,186	0
Commercial Loans | 30-59 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total	1,826	1,583
Commercial Loans | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	95	0
Commercial Loans | 60-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Loans | 60-89 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Loans | 60-89 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total	851	285
Consumer Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,649,056	1,421,953
Nonaccrual	5,768	6,526	7,294
Consumer Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total	115,379	124,878
Nonaccrual	334	269	$ 158
Consumer Loans | Current | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	1,638,157	1,409,907
Consumer Loans | Current | Other consumer
Financing Receivable, Past Due [Line Items]
Total	114,792	124,384
Consumer Loans | Total Past Due Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	10,899	12,046
Consumer Loans | Total Past Due Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total	587	494
Consumer Loans | 30-59 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	2,104	3,617
Consumer Loans | 30-59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	212	165
Consumer Loans | 60-89 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total	3,027	1,903
Consumer Loans | 60-89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Total	$ 41	$ 60

Loans and Allowance for Cred_14

Loans and Allowance for Credit Losses - Loans on Nonaccrual Status and Loans Past Due 90 Days or More and Still Accruing (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	$ 19,052	$ 66,291
End of Period Nonaccrual	12,677	19,052
Nonaccrual With No Related Allowance	0	6,582
Interest income recognized on nonaccrual	136	1,385
Commercial Loans | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	7,100	31,488
End of Period Nonaccrual	1,262	7,100
Nonaccrual With No Related Allowance	0	5,649
Interest income recognized on nonaccrual	5	580
Commercial Loans | Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	283	15,239
End of Period Nonaccrual	919	283
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	1	148
Commercial Loans | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	384	2,471
End of Period Nonaccrual	384	384
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	0	171
Commercial Loans | Business banking
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	4,490	9,641
End of Period Nonaccrual	4,010	4,490
Nonaccrual With No Related Allowance	0	933
Interest income recognized on nonaccrual	37	228
Consumer Loans | Consumer real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	6,526	7,294
End of Period Nonaccrual	5,768	6,526
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	93	257
Consumer Loans | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual	269	158
End of Period Nonaccrual	334	269
Nonaccrual With No Related Allowance	0	0
Interest income recognized on nonaccrual	$ 0	$ 1

Loans and Allowance for Cred_15

Loans and Allowance for Credit Losses - Collateral Dependent Loans by Class of Loan (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	$ 7,515,918	$ 7,183,969
Collateral Dependent Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		8,125
Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		1,738
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		154
Commercial Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	2,591,189	2,538,839
Commercial Loans | Commercial real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		5,649
Commercial Loans | Commercial real estate | Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Commercial Loans | Commercial real estate | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Commercial Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,424,141	1,510,392
Commercial Loans | Commercial and industrial | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Commercial Loans | Commercial and industrial | Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		626
Commercial Loans | Commercial and industrial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Commercial Loans | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	372,839	381,963
Commercial Loans | Commercial construction | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		1,655
Commercial Loans | Commercial construction | Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Commercial Loans | Commercial construction | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Commercial Loans | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	1,363,314	1,205,944
Commercial Loans | Business banking | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		260
Commercial Loans | Business banking | Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		1,112
Commercial Loans | Business banking | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		154
Consumer Loans | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance	$ 1,649,056	1,421,953
Consumer Loans | Consumer real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		561
Consumer Loans | Consumer real estate | Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		0
Consumer Loans | Consumer real estate | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans held for investment, outstanding balance		$ 0

Loans and Allowance for Cred_16

Loans and Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 105,757	$ 98,085	$ 101,340	$ 98,576
Provision for credit losses on loans	6,159	2,309	15,860	2,804
Charge-offs	(4,077)	(1,239)	(20,758)	(9,899)
Recoveries	367	529	11,196	8,213
Net (Charge-offs)/Recoveries	(3,710)	(710)	(9,562)	(1,686)
Balance at End of Period	108,206	99,694	108,206	99,694
Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			568
Commercial Loans | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	40,837	45,314	41,428	50,700
Provision for credit losses on loans	(1,081)	(2,997)	(2,636)	(8,471)
Charge-offs	0	(628)	0	(827)
Recoveries	1	145	965	432
Net (Charge-offs)/Recoveries	1	(483)	965	(395)
Balance at End of Period	39,757	41,834	39,757	41,834
Commercial Loans | Commercial real estate | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			0
Commercial Loans | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	28,328	21,516	25,710	19,727
Provision for credit losses on loans	6,068	3,806	14,424	4,573
Charge-offs	(3,033)	0	(18,253)	(5,797)
Recoveries	161	6	9,568	6,835
Net (Charge-offs)/Recoveries	(2,872)	6	(8,685)	1,038
Balance at End of Period	31,524	25,338	31,524	25,338
Commercial Loans | Commercial and industrial | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			75
Commercial Loans | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	6,739	6,583	6,264	5,355
Provision for credit losses on loans	93	(1,159)	351	68
Charge-offs	0	0	0	0
Recoveries	0	0	2	1
Net (Charge-offs)/Recoveries	0	0	2	1
Balance at End of Period	6,832	5,424	6,832	5,424
Commercial Loans | Commercial construction | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			215
Commercial Loans | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	13,616	12,157	12,547	11,338
Provision for credit losses on loans	(15)	950	1,325	3,158
Charge-offs	(590)	(178)	(1,252)	(1,924)
Recoveries	90	242	230	599
Net (Charge-offs)/Recoveries	(500)	64	(1,022)	(1,325)
Balance at End of Period	13,101	13,171	13,101	13,171
Commercial Loans | Business banking | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			251
Consumer Loans | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	13,418	9,673	12,105	8,733
Provision for credit losses on loans	896	1,075	1,934	2,083
Charge-offs	(107)	(161)	(224)	(299)
Recoveries	42	39	156	109
Net (Charge-offs)/Recoveries	(65)	(122)	(68)	(190)
Balance at End of Period	14,249	10,626	14,249	10,626
Consumer Loans | Consumer real estate | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			278
Consumer Loans | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,819	2,842	3,286	2,723
Provision for credit losses on loans	198	634	462	1,393
Charge-offs	(347)	(272)	(1,029)	(1,052)
Recoveries	73	97	275	237
Net (Charge-offs)/Recoveries	(274)	(175)	(754)	(815)
Balance at End of Period	$ 2,743	$ 3,301	2,743	$ 3,301
Consumer Loans | Other consumer | Impact of adopting ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ (251)

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative Assets (Included in Other Assets)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Notional Amount	$ 905,409	$ 976,963
Derivative financial assets	$ 93,601	$ 83,456
Derivative Liabilities (Included in Other Liabilities)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Notional Amount	$ 1,405,409	$ 1,476,707
Derivative financial liabilities	120,106	104,817
Interest rate swap contracts—commercial loans
Derivative Assets (Included in Other Assets)
Derivative financial assets	93,601	83,449
Derivative Liabilities (Included in Other Liabilities)
Derivative financial liabilities	120,106	104,817
Designated as Hedging Instruments
Derivative Assets (Included in Other Assets)
Notional Amount	0	0
Derivative financial assets	0	0
Derivative Liabilities (Included in Other Liabilities)
Notional Amount	500,000	500,000
Derivative financial liabilities	25,668	21,368
Designated as Hedging Instruments | Cash Flow Hedge
Derivative Assets (Included in Other Assets)
Notional Amount	0	0
Derivative financial assets	0	0
Derivative Liabilities (Included in Other Liabilities)
Notional Amount	500,000	500,000
Derivative financial liabilities	25,668	21,368
Not Designated as Hedging Instruments
Derivative Assets (Included in Other Assets)
Notional Amount	905,409	976,963
Derivative financial assets	93,601	83,456
Derivative Liabilities (Included in Other Liabilities)
Notional Amount	905,409	976,707
Derivative financial liabilities	94,438	83,449
Not Designated as Hedging Instruments | Interest rate swap contracts—commercial loans
Derivative Assets (Included in Other Assets)
Notional Amount	905,409	976,707
Derivative financial assets	93,601	83,449
Derivative Liabilities (Included in Other Liabilities)
Notional Amount	905,409	976,707
Derivative financial liabilities	94,438	83,449
Not Designated as Hedging Instruments | Interest rate lock commitments
Derivative Assets (Included in Other Assets)
Notional Amount	0	126
Derivative financial assets	0	5
Derivative Liabilities (Included in Other Liabilities)
Notional Amount	0	0
Derivative financial liabilities	0	0
Not Designated as Hedging Instruments | Forward sale contracts—mortgage loans
Derivative Assets (Included in Other Assets)
Notional Amount	0	130
Derivative financial assets	0	2
Derivative Liabilities (Included in Other Liabilities)
Notional Amount	0	0
Derivative financial liabilities	$ 0	$ 0

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Schedule of Interest Rate Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Derivative financial assets	$ 93,601	$ 83,456
Derivative financial liabilities	120,106	104,817
Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Gross amounts recognized	93,601	83,449
Gross amounts recognized	120,106	104,817
Gross amounts offset	0	0
Gross amounts offset	0	0
Derivative financial assets	93,601	83,449
Derivative financial liabilities	120,106	104,817
Gross amounts not offset, netting adjustment	(16,465)	(15,196)
Gross amounts not offset, netting adjustment	(16,465)	(15,196)
Gross amounts not offset, cash collateral	(77,049)	(65,065)
Gross amounts not offset, cash collateral	(10,506)	(6,307)
Net Amount	87	3,188
Net Amount	$ 93,135	$ 83,314

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Effect of Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Other Comprehensive Income (Loss)	$ (1,647)	$ (13,256)	$ (3,399)	$ (17,875)
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Interest Income	(2,749)	222	(6,958)	947
Interest rate swap contracts - cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Other Comprehensive Income (Loss)	(1,647)	(13,256)	(3,399)	(17,875)
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Interest Income	$ (2,749)	$ 222	$ (6,958)	$ 947

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Narrative (Details) $ in Millions	Sep. 30, 2023 USD ($)
Designated as Hedging Instruments | Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified as an increase to interest income, next 12 months	$ 13.7

Derivative Instruments and He_7

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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss) Gain	$ (851)	$ 15	$ (858)	$ (329)
Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss) Gain	(851)	64	(851)	71
Interest rate lock commitments—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss) Gain	0	(58)	(5)	(404)
Forward sale contracts—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss) Gain	$ 0	$ 9	$ (2)	$ 4

Commitments and Contingencies -

Commitments and Contingencies - Commitments and Letters of Credit (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Commitments and letters of credit	$ 2,750,554	$ 2,777,942
Commitments to extend credit
Other Commitments [Line Items]
Commitments and letters of credit	2,697,493	2,713,586
Standby letters of credit
Other Commitments [Line Items]
Commitments and letters of credit	$ 53,061	$ 64,356

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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 9,946	$ 7,387	$ 8,196	$ 5,189
Provision for credit losses	(661)	189	1,089	2,387
Balance at end of period	$ 9,285	$ 7,576	$ 9,285	$ 7,576

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Comprehensive Income (Loss)
Pre-Tax Amount	$ (14,610)	$ (60,763)	$ (17,042)	$ (137,151)
Tax Benefit	3,017	12,967	3,531	29,274
Net of Tax Amount	(11,593)	(47,796)	(13,511)	(107,877)
Change in net unrealized gains (losses) on available-for-sale debt securities
Other Comprehensive Income (Loss)
Pre-Tax Amount	(12,977)	(42,741)	(13,107)	(114,011)
Tax Benefit	2,696	9,121	2,708	24,325
Net of Tax Amount	(10,281)	(33,620)	(10,399)	(89,686)
Change in interest rate swap
Other Comprehensive Income (Loss)
Pre-Tax Amount	(2,073)	(16,852)	(4,300)	(22,724)
Tax Benefit	426	3,596	902	4,849
Net of Tax Amount	(1,647)	(13,256)	(3,399)	(17,875)
Adjustment to funded status of employee benefit plans
Other Comprehensive Income (Loss)
Pre-Tax Amount	440	(1,170)	365	(416)
Tax Benefit	(105)	250	(79)	100
Net of Tax Amount	$ 335	$ (920)	$ 287	$ (316)

Share Repurchase Plan - Narrati

Share Repurchase Plan - Narrative (Details) - USD ($)	Sep. 30, 2023	Jan. 25, 2023	Sep. 30, 2022
Equity [Abstract]
Stock repurchase program, authorized amount	$ 50,000,000	$ 50,000,000	$ 50,000,000

Share Repurchase Plan - Schedul

Share Repurchase Plan - Schedule of Repurchase Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Jan. 25, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Equity [Abstract]
Value of shares authorized to repurchase	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000		$ 50,000,000
Borrowing capacity	$ 9,808,000	$ 29,805,000	$ 9,808,000	$ 29,805,000	$ 9,807,000		$ 29,805,000	$ 33,289,000	$ 37,442,000
Total shares repurchased (in shares)	0	117,283	739,426	268,503
Average share price for the period (in dollars per share)	$ 0	$ 29.71	$ 27.05	$ 28.44
Total cost of repurchases, including excise tax	$ (1,000)
Total cost of repurchases		$ 3,484,000	$ 19,998,000	$ 7,637,000