S&T Bancorp (STBA) 10-Q 5 Aug 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Aug. 03, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	0-12508
Entity Registrant Name	S&T BANCORP INC
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1434426
Entity Address, Address Line One	800 Philadelphia Street
Entity Address, City or Town	Indiana
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15701
City Area Code	800
Local Phone Number	325-2265
Title of 12(b) Security	Common Stock, $2.50 par value
Trading Symbol	STBA
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		39,251,638
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000719220
Current Fiscal Year End Date	--12-31

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks, including interest-bearing deposits of $277,670 and $124,491 at June 30, 2020 and December 31, 2019	$ 351,365	$ 197,823
Securities, at fair value	804,366	784,283
Loans held for sale	14,259	5,256
Portfolio loans, net of unearned income	7,548,558	7,137,152
Allowance for credit losses on loans	114,609	62,224
Portfolio loans, net	7,433,949	7,074,928
Bank owned life insurance	81,443	80,473
Premises and equipment, net	56,441	56,940
Federal Home Loan Bank and other restricted stock, at cost	15,151	22,977
Goodwill	373,289	371,621
Other intangible assets, net	9,743	10,919
Other assets	334,290	159,429
Total Assets	9,474,296	8,764,649
Deposits:
Noninterest-bearing demand	2,250,958	1,698,082
Interest-bearing demand	1,055,261	962,331
Money market	2,121,588	1,949,811
Savings	916,268	830,919
Certificates of deposit	1,523,841	1,595,433
Total Deposits	7,867,916	7,036,576
Securities sold under repurchase agreements	92,159	19,888
Short-term borrowings	84,541	281,319
Long-term borrowings	49,489	50,868
Junior subordinated debt securities	64,053	64,277
Other liabilities	180,361	119,723
Total Liabilities	8,338,519	7,572,651
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—41,449,444 shares at June 30, 2020 and December 31, 2019 Outstanding— 39,263,460 shares at June 30, 2020 and 39,560,304 shares at December 31, 2019	103,623	103,623
Additional paid-in capital	400,417	399,944
Retained earnings	692,240	761,083
Accumulated other comprehensive income (loss)	9,232	(11,670)
Treasury stock (2,185,984 shares at June 30, 2020 and 1,889,140 shares at December 31, 2019, at cost)	(69,735)	(60,982)
Total Shareholders’ Equity	1,135,777	1,191,998
Total Liabilities and Shareholders’ Equity	$ 9,474,296	$ 8,764,649

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Cash and due from banks, interest-bearing amounts	$ 277,670	$ 124,491
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	41,449,444	41,449,444
Common stock, shares outstanding (in shares)	39,263,460	39,560,304
Treasury stock, shares (in shares)	2,185,984	1,889,140

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 75,498	$ 74,728	$ 157,549	$ 148,120
Investment Securities:
Taxable	3,791	3,647	8,074	7,437
Tax-exempt	959	834	1,762	1,679
Dividends	231	415	684	978
Total Interest and Dividend Income	80,479	79,624	168,069	158,214
INTEREST EXPENSE
Deposits	9,227	16,055	24,565	31,036
Borrowings and junior subordinated debt securities	1,104	2,742	3,320	5,995
Total Interest Expense	10,331	18,797	27,885	37,031
NET INTEREST INCOME	70,148	60,827	140,184	121,183
Provision for credit losses	86,759	2,205	106,809	7,854
Net Interest (Loss) Income After Provision for Credit Losses	(16,611)	58,622	33,375	113,329
NONINTEREST INCOME
Net gain on sale of securities	142	0	142	0
Commercial loan swap income	945	1,102	3,429	1,683
Mortgage banking	2,623	637	3,859	1,131
Other	2,974	2,387	2,255	4,499
Total Noninterest Income	15,224	12,901	27,627	24,263
NONINTEREST EXPENSE
Salaries and employee benefits	21,419	20,290	42,754	41,199
Data processing and information technology	3,585	3,414	7,453	6,646
Net occupancy	3,437	2,949	7,202	5,986
Furniture, equipment and software	3,006	2,301	5,525	4,531
Merger related expenses	0	618	2,342	618
Other taxes	1,604	1,456	3,205	2,641
Marketing	979	1,310	2,090	2,452
Professional services and legal	1,932	1,145	2,980	2,329
FDIC insurance	1,048	695	1,818	1,211
Other	6,468	6,174	14,501	11,658
Total Noninterest Expense	43,478	40,352	89,869	79,271
(Loss) Income Before Taxes	(44,865)	31,171	(28,867)	58,321
Income tax (benefit) expense	(11,793)	5,070	(9,026)	9,292
Net (Loss) Income	$ (33,072)	$ 26,101	$ (19,841)	$ 49,029
(Loss) earnings per share—basic (in dollars per share)	$ (0.85)	$ 0.76	$ (0.51)	$ 1.43
(Loss) earnings per share—diluted (in dollars per share)	(0.85)	0.76	(0.51)	1.43
Dividends declared per share (in dollars per share)	$ 0.28	$ 0.27	$ 0.56	$ 0.54
Comprehensive (Loss) Income	$ (29,512)	$ 33,513	$ 1,061	$ 62,617
Service charges on deposit accounts
NONINTEREST INCOME
Revenues from contract with customers	2,342	3,212	5,900	6,365
Debit and credit card
NONINTEREST INCOME
Revenues from contract with customers	3,612	3,501	7,093	6,476
Wealth management
NONINTEREST INCOME
Revenues from contract with customers	$ 2,586	$ 2,062	$ 4,949	$ 4,109

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Impact of new accounting standard	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained EarningsImpact of new accounting standard	Accumulated Other Comprehensive (Loss)/Income	Treasury Stock
Beginning Balance at Dec. 31, 2018	$ 935,761	$ 167	$ 90,326	$ 210,345	$ 701,819	$ 167	$ (23,107)	$ (43,622)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	49,029				49,029
Other comprehensive income (loss), net of tax	13,588						13,588
Cash dividends declared	(18,559)				(18,559)
Treasury stock issued for restricted stock awards	(891)				(1,879)			988
Repurchase of common stock	(15,122)							(15,122)
Recognition of restricted stock compensation expense	980			980
Ending Balance at Jun. 30, 2019	964,953		90,326	211,325	730,577		(9,519)	(57,756)
Beginning Balance at Dec. 31, 2018	935,761	167	90,326	210,345	701,819	167	(23,107)	(43,622)
Ending Balance at Dec. 31, 2019	$ 1,191,998	(22,590)	103,623	399,944	761,083	(22,590)	(11,670)	(60,982)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Mar. 31, 2019	$ 943,156		90,326	210,949	716,078		(16,931)	(57,266)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	26,101				26,101
Other comprehensive income (loss), net of tax	7,412						7,412
Cash dividends declared	(9,242)				(9,242)
Treasury stock issued for restricted stock awards	(15)				(2,360)			2,345
Repurchase of common stock	(2,835)							(2,835)
Recognition of restricted stock compensation expense	376			376
Ending Balance at Jun. 30, 2019	964,953		90,326	211,325	730,577		(9,519)	(57,756)
Beginning Balance at Dec. 31, 2019	1,191,998	$ (22,590)	103,623	399,944	761,083	$ (22,590)	(11,670)	(60,982)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(19,841)				(19,841)
Other comprehensive income (loss), net of tax	20,902						20,902
Cash dividends declared	(22,012)				(22,012)
Treasury stock issued for restricted stock awards	(594)				(4,400)			3,806
Repurchase of common stock	(12,559)							(12,559)
Recognition of restricted stock compensation expense	473			473
Ending Balance at Jun. 30, 2020	$ 1,135,777		103,623	400,417	692,240		9,232	(69,735)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning Balance at Mar. 31, 2020	$ 1,176,251		103,623	400,387	740,726		5,672	(74,157)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(33,072)				(33,072)
Other comprehensive income (loss), net of tax	3,560						3,560
Cash dividends declared	(10,961)				(10,961)
Treasury stock issued for restricted stock awards	(31)				(4,453)			4,422
Recognition of restricted stock compensation expense	30			30
Ending Balance at Jun. 30, 2020	$ 1,135,777		$ 103,623	$ 400,417	$ 692,240		$ 9,232	$ (69,735)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.28	$ 0.27	$ 0.56	$ 0.54
Treasury stock issued for restricted awards, net of forfeitures (in shares)	143,744	83,056	147,054	83,056
Forfeitures of restricted stock (in shares)	5,709	10,918	32,448	50,752
Repurchase of common stock (in shares)		71,936	411,430	385,840

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES
Net (loss) income	$ (19,841)	$ 49,029
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	106,809	7,854
Provision for unfunded loan commitments	0	208
Net depreciation, amortization and accretion	1,868	2,872
Net amortization of discounts and premiums on securities	2,189	1,562
Stock-based compensation expense	473	980
Gain on sale of securities	(142)	0
Gain on the sale of mortgage loans, net	(2,433)	(683)
Mortgage loans originated for sale	(169,243)	(38,720)
Proceeds from the sale of mortgage loans	162,216	33,639
Net change in:
Interest receivable	(3,201)	(1,235)
Collateral receivable	(91,736)	0
Interest payable	(1,837)	(1,582)
Other assets	(77,724)	(11,006)
Other liabilities	61,034	15,978
Net Cash (Used in) Provided by Operating Activities	(31,568)	58,896
INVESTING ACTIVITIES
Purchases of securities	(80,292)	(9,438)
Proceeds from maturities, prepayments and calls of securities	81,156	40,260
Proceeds from sales of securities	1,349	0
Net proceeds from sales of Federal Home Loan Bank stock	7,826	6,944
Net increase in loans	(491,457)	(95,691)
Proceeds from sale of loans not originated for resale	0	465
Purchases of premises and equipment	(2,862)	(2,559)
Proceeds from the sale of premises and equipment	0	9
Net Cash Used in Investing Activities	(484,280)	(60,010)
FINANCING ACTIVITIES
Net increase in core deposits	902,933	246,561
Net decrease in certificates of deposit	(71,007)	(63,736)
Net increase (decrease) in securities sold under repurchase agreements	72,271	(4,229)
Net decrease in short-term borrowings	(196,778)	(175,000)
Repayments on long-term borrowings	(2,864)	(523)
Treasury shares issued-net	(594)	(891)
Cash dividends paid to common shareholders	(22,012)	(18,559)
Repurchase of common stock	(12,559)	(15,122)
Net Cash Provided by (Used in) Financing Activities	669,390	(31,499)
Net increase (decrease) in cash and cash equivalents	153,542	(32,613)
Cash and cash equivalents at beginning of period	197,823	155,489
Cash and Cash Equivalents at End of Period	351,365	122,876
Supplemental Disclosures
Leased right-of-use operating assets and lease liabilities	91	37,263
Interest paid	29,721	38,612
Income taxes paid, net of refunds	210	4,557
Transfers of loans to other real estate owned	$ 513	$ 215

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2020
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, 2019, filed with the Securities and Exchange Commission, or SEC, on March 2, 2020. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period. On June 5, 2019 we entered into an agreement to acquire DNB Financial Corporation, or DNB, and the transaction was completed on November 30, 2019. Refer to Note 2, Business Combinations for further details on the merger. Reclassification A mounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our results of operations or financial condition. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. Recently Adopted Accounting Standards Updates, or ASU or Update Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, the Financial Accounting Standards Board, or FASB, issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The amendments in this ASU apply to an entity that is a customer in a hosting arrangement that is a service contract. These amendments relate to accounting for implementation costs (e.g., implementation, setup and other upfront costs). These amendments require an entity in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which costs to capitalize and which costs to expense. These amendments require the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This ASU is effective for annual and interim periods beginning after December 15, 2019. We adopted this ASU on January 1, 2020. The amendments in this ASU did not materially impact our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU remove certain disclosures from Topic 820, modify disclosures and/or require additional disclosures. The amendments in this Update required us to change our Fair Value disclosures beginning with the disclosures included in Form 10-Q for the period ended March 31, 2020. We adopted this ASU on January 1, 2020. The amendments in this ASU did not materially impact our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Refer to Note 4, Fair Value Measurements. Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment (Topic 350). The main objective of this ASU is to simplify the current requirements for testing goodwill for impairment by eliminating step two from the goodwill impairment test. The amendments are expected to reduce the complexity and costs associated with performing the goodwill impairment test, which could result in recording impairment charges sooner. This Update is effective for any interim and annual impairment tests in reporting periods in fiscal years beginning after December 15, 2019. We adopted the amendments of this ASU on January 1, 2020. The amendments in this ASU did not have any impact on our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Financial Instruments - Credit Losses On January 1, 2020, we adopted ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which replaces the incurred loss methodology for determining our provision for credit losses, and allowance for credit losses, or ACL, with an expected loss methodology that is referred to as the Current Expected Credit Loss, or CECL, model. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including our loans and off-balance sheet credit exposures. In addition, ASU 2016-13 made changes to the accounting for available-for-sale debt securities. Credit losses related to available-for-sale debt securities (regardless of whether the impairment is considered to be other-than-temporary) will be measured in a manner similar to the present, except that such losses will be recorded as allowances rather than as reductions in the amortized cost of the related securities. We adopted ASU 2016-13 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under ASU 2016-13 while prior period amounts continue to be reported in accordance with previously applicable GAAP. We made the accounting policy election to not measure an ACL for accrued interest receivables for loans and securities. Accrued interest deemed uncollectible will be written off through interest income. The majority of our available-for-sale debt securities are government agency-backed securities for which the risk of loss is minimal, and accordingly the ACL is immaterial. In connection with our adoption of ASU 2016-13, we made changes to our loan portfolio segments to align with the methodology applied in determining the allowance under CECL. Refer to Note 7, Allowance for Credit Losses for further discussion of these portfolio segments. Our new segmentation breaks out business banking loans from our other loan segments: Commercial Real Estate, or CRE, Commercial and Industrial, or C&I, Commercial Construction, Consumer Real Estate and Other Consumer. Business banking loans are commercial loans made to small businesses that are standard, non-complex products and evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards. The following table details the impact of ASU 2016-13 and the reclassification of loans for the identification of new portfolio loan segments under CECL: January 1, 2020 (dollars in thousands) As Reported Under ASU 2016-13 Pre-ASU 2016-13 Impact of ASU 2016-13 Adoption Assets: Loans held for investment (outstanding balance) Commercial real estate $ 2,946,319 $ 3,416,518 $ (470,199) Commercial and industrial 1,458,541 1,720,833 (262,292) Commercial construction 345,263 375,445 (30,182) Business banking 1,092,908 — 1,092,908 Consumer real estate 1,235,352 1,545,323 (309,971) Other consumer 58,769 79,033 (20,264) Allowance for credit losses on loans (89,577) (62,224) (27,353) Total loans held for investment, net $ 7,047,575 $ 7,074,928 $ (27,353) Net deferred tax asset $ 19,317 $ 13,206 $ 6,111 Liabilities: Allowance for credit losses on unfunded loan commitments $ 4,462 $ 3,113 $ 1,349 Equity: Retained earnings $ 738,493 $ 761,083 $ (22,590) The adoption of ASU 2016-13 Allowance for Credit Losses Policy The ACL is a valuation reserve established and maintained by charges against operating income and is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the ACL when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. The ACL is an estimate of expected credit losses, measured over the contractual life of a loan, that considers our historical loss experience, current conditions and forecasts of future economic conditions. Determination of an appropriate ACL is inherently subjective and may have significant changes from period to period. The methodology for determining the ACL has two main components: evaluation of expected credit losses for certain groups of homogeneous loans that share similar risk characteristics and evaluation of loans that do not share risk characteristics with other loans. The ACL for homogeneous loans is calculated using a life-time loss rate methodology with both a quantitative and a qualitative analysis that is applied on a quarterly basis. The ACL model is comprised of six distinct portfolio segments: 1) Construction, 2) CRE, 3) C&I, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. Each segment has a distinct set of risk characteristics monitored by management. We further evaluate the ACL at a disaggregated level which includes type of collateral, loan participations, non-owner occupied and our internal risk rating system for the commercial segments and type of collateral, lien position, and FICO score, for the consumer segments. Historical credit loss experience is the basis for the estimation of expected credit losses. We apply historical loss rates to pools of loans with similar risk characteristics. After consideration of the historic loss calculation, management applies qualitative adjustments to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information at the balance sheet date. Our reasonable and supportable forecast adjustment is based on the unemployment forecast and management judgment. For periods beyond our two year reasonable and supportable forecast, we revert to the historical loss rate. We revert to historical loss rates utilizing a straight-line method over a one year reversion period. The qualitative adjustments for current conditions are based upon changes in lending policies and practices, experience and ability of lending staff, quality of the bank’s loan review system, value of underlying collateral for collateral dependent loans, the existence of and changes in concentrations and other external factors. These modified historical loss rates are multiplied by the outstanding principal balance of each loan to calculate a required reserve. A similar process is employed to calculate a reserve assigned to off-balance sheet commitments, specifically unfunded loan commitments and letters of credit, and any needed reserve is recorded in other liabilities. The ACL for individual loans begins with the use of normal credit review procedures to identify whether a loan no longer shares similar risk characteristics with other pooled loans and therefore, should be individually assessed. We evaluate all commercial loans greater than $0.5 million that meet the following criteria: 1) when it is determined that foreclosure is probable, 2) substandard, doubtful and nonperforming loans when repayment is expected to be provided substantially through the operation or sale of the collateral, 3) any commercial troubled debt restructuring, or TDR, or any loan reasonably expected to become a TDR whether on accrual or nonaccrual status and 4) when it is determined by management that a loan does not share similar risk characteristics with other loans. Specific reserves are established based on the following three acceptable methods for measuring the ACL: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral when the loan is collateral dependent. Our individual loan evaluations consist primarily of the fair value of collateral method because most of our loans are collateral dependent. Collateral values are discounted to consider disposition costs when appropriate. A specific reserve is established or a charge-off is taken if the fair value of the loan is less than the loan balance. Although we believe our process for determining the ACL appropriately considers all the factors that would likely result in credit losses, the process includes subjective elements and may be susceptible to significant change. To the extent actual losses are higher than management estimates, additional provision for credit losses could be required and could adversely affect our earnings or financial position in future periods. Accounting Standards Issued But Not Yet Adopted Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans In August 2018, the FASB issued ASU No. 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans. The amendments in this ASU apply to all employers that sponsor defined benefit pension or other postretirement plans. These amendments remove certain disclosures from Topic 715-20 and require additional disclosures. The amendments in this ASU will require S&T to update our employee benefits disclosures beginning with our Form 10-Q for the period ended March 31, 2021. The amendments in this ASU will have no impact on our consolidated financial statements. Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The amendments in this ASU simplifies the accounting for income taxes by removing certain exceptions and improves the consistent application of GAAP by clarifying and amending other existing guidance. The amendments in this ASU will be effective on January 1, 2021 and are not expected to have any impact on our consolidated financial statements. Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments in this ASU provide optional guidance for a limited period of time to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting. The amendments provide optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. Modified contracts that meet certain scope guidance are eligible for relief from the modification accounting requirements in US GAAP. The optional guidance generally allows for the modified contract to be accounted for as a continuation of the existing contract and does not require contract remeasurement at the modification date or reassessment of a previous accounting determination. The amendments in this ASU are effective as of March 12, 2020 through December 31, 2022. We are evaluating the impacts of this ASU and have not yet determined whether LIBOR transition and this ASU will have material effects on our business operations and consolidated financial statements. SEC Release No. 2020-118 - Amendments to Improve Financial Disclosures about Acquisitions and Dispositions of Businesses In May 2020, the Securities and Exchange Commission adopted amendments to the financial disclosure requirements in Regulation S-X for acquisitions and dispositions of businesses, including real estate operations, in Rules 3-05, 3-14, 8-04, 8-05, 8-06, and Article 11, as well as in other related rules and forms. In conjunction with these changes, the Commission also amended the significance tests in the “significant subsidiary” definition in Rule 1-02(w), Securities Act Rule 405, and Exchange Act Rule 12b-2 to improve their application and to assist registrants in making more meaningful determinations of whether a subsidiary or an acquired or disposed business is significant. In addition, to address the unique attributes of investment companies and business development companies, the Commission adopted new requirements regarding fund acquisitions specific to registered investment companies and business development companies. The amendments in this final rule are effective beginning January 1, 2021. We are evaluating the impact of this final rule and we expect these amendments to impact disclosures in our consolidated financial statements relating to any future acquisitions and disposition of businesses.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS On November 30, 2019, we completed our acquisition of DNB Financial Corporation, or DNB, and DNB First National Association, its wholly-owned bank subsidiary, located in Downingtown, Pennsylvania. The acquisition of DNB expanded our Eastern Pennsylvania market by adding 14 banking locations, in an all-stock transaction structured as a merger of DNB with and into S&T, with S&T being the surviving entity. The related systems conversion of DNB into S&T Bank occurred on February 7, 2020. DNB shareholders received, without interest, 1.22 shares of S&T common stock for each share of DNB common stock. The total purchase price was approximately $201.0 million, which included $0.4 million of cash and 5,318,964 S&T common shares at a fair value of $37.72 per share. The fair value of $37.72 per share of S&T common stock was based on the November 30, 2019 closing price. The Merger was accounted for under the acquisition method of accounting and our Consolidated Financial Statements include all DNB Bank transactions beginning on December 1, 2019. Goodwill of $85.8 million at June 30, 2020 was calculated as the excess of the consideration exchanged over the fair value of the identifiable net assets acquired. All of the goodwill was assigned to our Community Banking segment. The goodwill recognized is not deductible for tax purposes. The following table provides a summary of the assets acquired and liabilities assumed from DNB, the preliminary estimates of the fair value adjustments necessary to adjust those acquired assets and assumed liabilities to estimated fair value and the preliminary estimates of the resultant fair values of those assets and liabilities by S&T at November 30, 2019, the acquisition date. Preliminary estimates were adjusted by $1.7 million during the six months ended June 30, 2020. These measurement period adjustments primarily related to $2.4 million reduction in the fair value of loans, $0.3 million reduction in the fair value of borrowings and $0.3 million in deferred income taxes. As information becomes known, additional fair value adjustments to loans, other real estate owned, or OREO, and income taxes may be recognized during the measurement period, which may not extend beyond one year following the acquisition. The following table presents the preliminary fair value adjustments and the measurement period adjustments as of the dates presented: November 30, 2019 June 30, 2020 As Recorded by DNB Preliminary Fair Value Adjustments As Recorded by S&T Measurement Period Adjustments As Recorded by S&T Fair Value of Assets Acquired Cash and cash equivalents $ 64,119 $ — $ 64,119 $ — $ 64,119 Securities and other investments 108,715 183 108,898 — 108,898 Loans 917,127 (8,143) 908,984 (2,377) 906,607 Allowance for credit losses (6,487) 6,487 — — — Goodwill 15,525 (15,525) — — — Premises and equipment 6,782 8,090 14,872 — 14,872 Accrued interest receivable 4,138 — 4,138 — 4,138 Deferred income taxes 2,017 (3,298) (1,281) 311 (970) Core deposits and other intangible assets 269 (269) — — — Other assets 24,883 (4,278) 20,605 74 20,679 Total Assets Acquired 1,137,088 (16,753) 1,120,335 (1,992) 1,118,343 Fair Value of Liabilities Assumed Deposits 966,263 1,002 967,265 — 967,265 Borrowings 37,617 (276) 37,341 (257) 37,084 Accrued interest payable and other liabilities 11,157 (3,184) 7,973 (68) 7,905 Total Liabilities Assumed 1,015,037 (2,458) 1,012,579 (325) 1,012,254 Total Net Assets Acquired $ 122,051 $ (14,295) $ 107,756 $ (1,667) $ 106,089 Core Deposit Intangible Asset $ 7,288 $ — $ 7,288 Wealth Management Intangible Asset 1,772 — 1,772 Total Fair Value of Net Assets Acquired and Identified $ 116,816 $ (1,667) $ 115,149 Consideration Paid Cash $ 360 $ — $ 360 Common stock 200,631 — 200,631 Fair Value of Total Consideration $ 200,991 $ — $ 200,991 Goodwill $ 84,175 $ 1,667 $ 85,842 Loans acquired in the Merger were recorded at fair value with no carryover of the related ACL from DNB. Determining the fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. The preliminary fair value of the loans acquired was estimated at $909.0 million, net of a $10.5 million discount. The discount is accreted to interest income over the remaining contractual life of the loans. During the six month period ended June 30, 2020, the fair value of acquired loans was reduced by an additional $2.5 million as we continue to finalize our evaluation of the loan portfolio. As of June 30, 2020, direct costs related to the DNB merger of $13.7 million were recognized and expensed as incurred. During the six months ended June 30, 2020, we recognized $2.3 million of merger related expenses including $0.2 million in legal and professional fees, $1.4 million in severance payments and stay-bonuses, $0.4 million for data processing and $0.3 million in other expenses. As of December 31, 2019, we recognized $11.4 million of merger related expenses, including $4.7 million for data processing contract termination and system conversion costs, $2.8 million in legal and professional expenses, $3.4 million in severance payments and $0.5 million in other expenses.

(Loss) Earnings Per Share

(Loss) Earnings Per Share	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
(LOSS) EARNINGS PER SHARE	(LOSS) EARNINGS PER SHARE Diluted (loss) 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 following table reconciles the numerators and denominators of basic and diluted (loss) earnings per share calculations for the periods presented. Three Months Ended June 30, Six Months Ended June 30, (in thousands, except share and per share data) 2020 2019 2020 2019 Numerator for (Loss) Earnings per Share—Basic: Net (loss) income $ (33,072) $ 26,101 $ (19,841) $ 49,029 Less: Income allocated to participating shares — 72 — 137 Net (Loss) Income Allocated to Shareholders $ (33,072) $ 26,029 $ (19,841) $ 48,892 Numerator for (Loss) Earnings per Share—Diluted: Net (loss) income $ (33,072) $ 26,101 $ (19,841) $ 49,029 Net (Loss) Income Available to Shareholders $ (33,072) $ 26,101 $ (19,841) $ 49,029 Denominators for (Loss) Earnings per Share: Weighted Average Shares Outstanding—Basic 39,013,161 34,158,136 39,142,351 34,298,185 Add: Potentially dilutive shares — 52,850 — 88,121 Denominator for Treasury Stock Method—Diluted 39,013,161 34,210,986 39,142,351 34,386,306 Weighted Average Shares Outstanding—Basic 39,013,161 34,158,136 39,142,351 34,298,185 Add: Average participating shares outstanding — 93,433 — 96,261 Denominator for Two-Class Method—Diluted 39,013,161 34,251,569 39,142,351 34,394,446 (Loss) Earnings per share—basic $ (0.85) $ 0.76 $ (0.51) $ 1.43 (Loss) Earnings per share—diluted $ (0.85) $ 0.76 $ (0.51) $ 1.43 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 21,333 5,183 82,624 44,153

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, loans held for investment, OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets. Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which are developed based on market data that we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances. The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred. The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis. Recurring Basis Available-for-Sale Debt Securities We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing services which provide us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market valuation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models, vast descriptive terms and conditions databases and extensive quality control programs. Equity Securities Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3. Deferred Compensation Plan Assets We use quoted market prices to determine the fair value of our equity security assets. These securities are reported at fair value with the gains and losses included in noninterest income in our Consolidated Statements of Comprehensive (Loss) Income. These assets are held in a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1. Deferred compensation plan assets are reported in other assets in the Consolidated Balance Sheets. Derivative Financial Instruments We use derivative instruments, including interest rate swaps for commercial loans with our customers, interest rate lock commitments and the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties’ nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings. Nonrecurring Basis Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans are transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3. Loans Held for Investment Loans that are individually evaluated to determine whether a specific allocation of ACL is needed are reported at fair value. Fair value is determined using the following methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Loans carried at fair value are classified as Level 3. OREO and Other Repossessed Assets OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3. Mortgage Servicing Rights The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. Since the valuation model includes significant unobservable inputs as listed above, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into mortgage banking income in the Consolidated Statements of Comprehensive (Loss) Income. Other Assets We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above. Financial Instruments In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and a willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments. Cash and Cash Equivalents The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value. Loans The fair value of variable rate loans that may reprice frequently at short-term market rates is based on carrying values adjusted for liquidity and credit risk. The fair value of variable rate loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for liquidity and credit risk. The fair value of fixed rate loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk. Bank Owned Life Insurance Fair value approximates net cash surrender value of bank owned life insurance, or BOLI. Federal Home Loan Bank, or FHLB, and Other Restricted Stock It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; it is presented at carrying value. Collateral Receivable The carrying amount included in Other Assets on our Consolidated Balance Sheets approximates fair value. Deposits The fair values disclosed for deposits without defined maturities ( e.g. , noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value. Short-Term Borrowings The carrying amounts of securities sold under repurchase agreements, or REPOs, and other short-term borrowings approximate their fair values. Long-Term Borrowings The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values. Junior Subordinated Debt Securities The interest rate on the variable rate junior subordinated debt securities is reset quarterly; therefore, the carrying values approximate their fair values. Loan Commitments and Standby Letters of Credit Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties. Other Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations. 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 June 30, 2020 and December 31, 2019. There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented. June 30, 2020 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ — $ 10,355 $ — $ 10,355 Obligations of U.S. government corporations and agencies — 163,703 — 163,703 Collateralized mortgage obligations of U.S. government corporations and agencies — 181,162 — 181,162 Residential mortgage-backed securities of U.S. government corporations and agencies — 19,768 — 19,768 Commercial mortgage-backed securities of U.S. government corporations and agencies — 284,550 — 284,550 Corporate obligations — 5,038 — 5,038 Obligations of states and political subdivisions — 137,127 — 137,127 Total Available-for-sale Debt Securities — 801,703 — 801,703 Marketable equity securities 2,602 61 — 2,663 Total Securities 2,602 801,764 — 804,366 Securities held in a deferred compensation plan 5,489 — — 5,489 Derivative financial assets: Interest rate swaps — 94,371 — 94,371 Interest rate lock commitments — 2,583 — 2,583 Total Assets $ 8,091 $ 898,718 $ — $ 906,809 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 94,286 $ — $ 94,286 Forward sale contracts — 594 — 594 Total Liabilities $ — $ 94,880 $ — $ 94,880 December 31, 2019 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ — $ 10,040 $ — $ 10,040 Obligations of U.S. government corporations and agencies — 157,697 — 157,697 Collateralized mortgage obligations of U.S. government corporations and agencies — 189,348 — 189,348 Residential mortgage-backed securities of U.S. government corporations and agencies — 22,418 — 22,418 Commercial mortgage-backed securities of U.S. government corporations and agencies — 275,870 — 275,870 Corporate Bonds — 7,627 — 7,627 Obligations of states and political subdivisions — 116,133 — 116,133 Total Available-for-Sale Debt Securities — 779,133 — 779,133 Marketable equity securities 5,078 72 — 5,150 Total Securities 5,078 779,205 — 784,283 Securities held in a deferred compensation plan 5,987 — — 5,987 Derivative financial assets: Interest rate swaps — 25,647 — 25,647 Interest rate lock commitments — 321 — 321 Forward sale contracts — 1 — 1 Total Assets $ 11,065 $ 805,174 $ — $ 816,239 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 25,615 $ — $ 25,615 Total Liabilities $ — $25,615 $— $25,615 Assets Recorded at Fair Value on a Nonrecurring Basis We may be required to measure certain assets and liabilities at fair value on a nonrecurring basis. Nonrecurring assets are recorded at the lower of cost or fair value in our financial statements. There were no liabilities measured at fair value on a nonrecurring basis at either June 30, 2020 or December 31, 2019. For Level 3 assets measured at fair value on a nonrecurring basis as of June 30, 2020 and December 31, 2019, the significant unobservable inputs used in the fair value measurements were as follows: June 30, 2020 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans held for investment $ 61,068 Collateral method Costs to sell 0% - 17% 6.81% Discounted cash flow method Discount rate 3.25% 3.25% Other real estate owned 2,413 Collateral method Costs to sell 0% - 7.00% 4.52% Mortgage servicing rights $ 4,278 Discounted cash flow method Discount rate 9.33% - 12.55% 9.44% Constant prepayment rates 7.59% - 13.58% 12.95% Total Assets $ 67,759 December 31, 2019 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans held for investment $ 38,697 Collateral method Costs to sell 0% - 20% 8.55% Discounted cash flow method Discount rate 4.75% - 5.50% 5.28% Other real estate owned 3,231 Collateral method Costs to sell 7.00% 7.00% Mortgage servicing rights $ 1,134 Discounted cash flow method Discount rate 9.39% - 12.54% 9.49% Constant prepayment rates 7.46% - 12.74% 9.73% Total Assets $ 43,062 (1) Weighted averages for loans held for investment were weighted by loan amounts. (2 ) Weighted averages for other real estate owned were weighted by OREO balances. (3) Weighted averages for mortgage services rights discount rate and prepayment rates are based on note rate tranches and voluntary constant prepayment rates. The carrying values and fair values of our financial instruments at June 30, 2020 and December 31, 2019 are presented in the following tables: Carrying Value (1) Fair Value Measurements at June 30, 2020 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 351,365 $ 351,365 $ 351,365 $ — $ — Securities 804,366 804,366 2,602 801,764 — Loans held for sale 14,259 14,072 — — 14,072 Portfolio loans, net 7,433,949 7,422,797 — — 7,422,797 Bank owned life insurance 81,443 81,443 — 81,443 — FHLB and other restricted stock 15,151 15,151 — — 15,151 Collateral receivable 91,736 91,736 91,736 — — Securities held in a deferred compensation plan 5,489 5,489 5,489 — — Mortgage servicing rights 4,279 4,279 — — 4,279 Interest rate swaps 94,371 94,371 — 94,371 — Interest rate lock commitments 2,583 2,583 — 2,583 — LIABILITIES Deposits $ 7,867,916 $ 7,874,298 $ 6,344,076 $ 1,530,222 $ — Securities sold under repurchase agreements 92,159 92,159 92,159 — — Short-term borrowings 84,541 84,541 84,541 — — Long-term borrowings 49,489 50,538 4,585 45,953 — Junior subordinated debt securities 64,053 64,053 64,053 — — Interest rate swaps 94,286 94,286 — 94,286 — Forward sales contracts 594 594 — 594 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2019 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 197,823 $ 197,823 $ 197,823 $ — $ — Securities 784,283 784,283 5,078 779,205 — Loans held for sale 5,256 5,256 — — 5,256 Portfolio loans, net 7,074,928 6,940,875 — — 6,940,875 Bank owned life insurance 80,473 80,473 — 80,473 — FHLB and other restricted stock 22,977 22,977 — — 22,977 Securities held in a Deferred Compensation Plan 5,987 5,987 5,987 — — Mortgage servicing rights 4,662 4,650 — — 4,650 Interest rate swaps 25,647 25,647 — 25,647 — Interest rate lock commitments 321 321 — 321 — Forward sale contracts 1 1 — 1 — LIABILITIES Deposits $ 7,036,576 $ 7,034,595 $ 5,441,143 $ 1,593,452 $ — Securities sold under repurchase agreements 19,888 19,888 19,888 — — Short-term borrowings 281,319 281,319 281,319 — — Long-term borrowings 50,868 51,339 4,678 46,661 — Junior subordinated debt securities 64,277 64,277 64,277 — — Interest rate swaps 25,615 25,615 — 25,615 — (1) As reported in the Consolidated Balance Sheets

Securities

Securities	6 Months Ended
	Jun. 30, 2020
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) June 30, 2020 December 31, 2019 Available-for-sale debt securities $ 801,703 $ 779,133 Marketable equity securities 2,663 5,150 Total Securities $ 804,366 $ 784,283 Available-for-Sale Debt Securities The following tables present the amortized cost and fair value of available-for-sale debt securities as of the dates presented: June 30, 2020 December 31, 2019 (dollars in thousands) Amortized Gross Gross Fair Amortized Gross Gross Fair U.S. Treasury securities $ 9,975 $ 380 $ — $ 10,355 $ 9,969 $ 71 $ — $ 10,040 Obligations of U.S. government corporations and agencies 158,869 4,835 (1) 163,703 155,969 1,773 (45) 157,697 Collateralized mortgage obligations of U.S. government corporations and agencies 172,938 8,224 — 181,162 186,879 2,773 (304) 189,348 Residential mortgage-backed securities of U.S. government corporations and agencies 18,891 877 — 19,768 22,120 321 (23) 22,418 Commercial mortgage-backed securities of U.S. government corporations and agencies 269,673 14,877 — 284,550 273,771 2,680 (581) 275,870 Corporate obligations 5,026 12 — 5,038 7,603 24 — 7,627 Obligations of states and political subdivisions 130,002 7,125 — 137,127 112,116 4,017 — 116,133 Total Available-for-Sale Debt Securities (1) $ 765,374 $ 36,330 $ (1) $ 801,703 $ 768,427 $ 11,659 $ (953) $ 779,133 (1) Excludes interest receivable of $3.4 million at June 30, 2020 and $3.4 million at December 31, 2019. 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: June 30, 2020 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies 1 49,990 (1) — — — 1 49,990 (1) Collateralized mortgage obligations of U.S. government corporations and agencies 1 1 — — — — 1 1 — Residential mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Commercial mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Corporate bonds — — — — — — — — — Obligations of states and political subdivisions — — — — — — — — — Total 2 $ 49,991 $ (1) — $ — $ — 2 $ 49,991 $ (1) December 31, 2019 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies 3 22,638 (45) — — — 3 22,638 (45) Collateralized mortgage obligations of U.S. government corporations and agencies 6 23,393 (73) 6 25,254 (231) 12 48,647 (304) Residential mortgage-backed securities of U.S. government corporations and agencies 1 982 (2) 1 2,534 (21) 2 3,516 (23) Commercial mortgage-backed securities of U.S. government corporations and agencies 9 90,005 (581) — — — 9 90,005 (581) Corporate bonds 1 79 — — — — 1 79 — Obligations of states and political subdivisions — — — — — — — — — Total Temporarily Impaired Debt Securities 20 $ 137,097 $ (701) 7 $ 27,788 $ (252) 27 $ 164,885 $ (953) We evaluate quarterly securities with unrealized losses to determine if the decline in fair value has resulted from credit losses or other factors. There were two debt securities in an unrealized loss position at June 30, 2020 and 27 debt securities in an unrealized loss position at December 31, 2019. We do not intend to sell and it is more likely than not that we will not be required to sell any of the securities in an unrealized loss position before recovery of their amortized cost. The unrealized losses on debt securities were attributable to changes in interest rates and not related to the credit quality of these issuers. All debt securities were determined to be investment grade and paying principal and interest according to the contractual terms of the security. We concluded that the allowance for credit losses for debt securities was immaterial at June 30, 2020. Prior to the adoption of ASU 2016-13 there was no other than temporary impairment, or OTTI, recorded during the six months ended June 30, 2019. 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: June 30, 2020 December 31, 2019 (dollars in thousands) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains/(Losses) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains/(Losses) Total unrealized gains/(losses) on available-for-sale debt securities $ 36,330 $ (1) $ 36,329 $ 11,659 $ (953) $ 10,706 Income tax (expense) benefit (7,736) — (7,736) (2,486) 203 (2,283) Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss) $ 28,594 $ (1) $ 28,593 $ 9,173 $ (750) $ 8,423 The amortized cost and fair value of available-for-sale debt securities at June 30, 2020 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. June 30, 2020 (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 $ 106,927 $ 107,417 Due after one year through five years 105,757 111,561 Due after five years through ten years 55,138 58,778 Due after ten years 31,024 33,429 Available-for-Sale Debt Securities With Maturities 298,846 311,185 Collateralized mortgage obligations of U.S. government corporations and agencies 172,938 181,162 Residential mortgage-backed securities of U.S. government corporations and agencies 18,891 19,768 Commercial mortgage-backed securities of U.S. government corporations and agencies 269,673 284,550 Corporate Securities 5,026 5,038 Total Available-for-Sale Debt Securities $ 765,374 $ 801,703 Debt securities with carrying values of $340.6 million at June 30, 2020 and $286.0 million at December 31, 2019 were pledged for various regulatory and legal requirements. Marketable Equity Securities The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands) 2020 2019 2020 2019 Marketable Equity Securities Net gains and losses recognized during the period on equity securities $ 448 $ 52 $ (1,137) $ (266) Less: Net gains and losses recognized during the period on equity securities sold during the period 142 — 142 — Unrealized Losses/Gains Recognized During the Reporting Period on Equity Securities Still Held at the Reporting Date $ 306 $ 52 $ (1,279) $ (266) Total unrealized gains and losses on marketable equity securities recognized during the current period are included in other noninterest income on the Consolidated Statements of Comprehensive (Loss) Income.

Loans and Loans Held for Sale

Loans and Loans Held for Sale	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
LOANS AND LOANS HELD FOR SALE	LOANS AND LOANS HELD FOR SALE Loans are presented net of unearned income of $16.7 million at June 30, 2020 and $4.6 million at December 31, 2019 and net of a discount related to purchase accounting fair value adjustments of $10.5 million at June 30, 2020 and $12.3 million at December 31, 2019. The following table presents loans as of the dates presented: (dollars in thousands) June 30, 2020 December 31, 2019 Commercial Commercial real estate $ 3,345,513 $ 3,416,518 Commercial and industrial 2,140,355 1,720,833 Commercial construction 459,264 375,445 Total Commercial Loans 5,945,132 5,512,796 Consumer Residential mortgage 971,023 998,585 Home Equity 539,519 538,348 Installment and other consumer 79,816 79,033 Consumer construction 13,068 8,390 Total Consumer Loans 1,603,426 1,624,356 Total Portfolio Loans 7,548,558 7,137,152 Loans held for sale 14,259 5,256 Total Loans (1) $ 7,562,817 $ 7,142,408 (1) Excludes interest receivable of $25.4 million at June 30, 2020 and $22.1 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets. Commercial and industrial loans, or C&I, included $547.6 million of loans originated under the Paycheck Protection Program, or PPP, at June 30, 2020. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security, or CARES Act was signed into law. The CARES Act included the PPP, a program designed to aid small and medium sized businesses through federally guaranteed loans distributed through banks. PPP loans are forgivable, in whole or in part, if the proceeds are used for payroll and other permitted expenses in accordance with the requirements of the PPP. The loans are 100 percent guaranteed by the SBA. These loans carry a fixed rate of 1.00 percent and a term of two years, or five years for loans approved by the Small Business Administration, or SBA, on or after June 5, 2020. Payments are deferred for at least six months of the loan. The SBA pays us a processing fee ranging from 1 percent to 5 percent based on the size of the loan. Interest is accrued as earned and loan origination fees and direct costs are deferred and accreted or amortized into interest income over the life of the loan using the level yield method. When a PPP loan is paid off or forgiven by the SBA, the remaining unaccreted or unamortized net origination fees or costs will be immediately recognized into income. We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, geography, collateral and industry and actively managing concentrations. When concentrations exist in certain segments, we mitigate this risk by reviewing the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments. Total commercial loans represented 78.8 percent of total portfolio loans at June 30, 2020 and 77.2 percent at December 31, 2019. Within our commercial portfolio, the CRE and Commercial Construction portfolios combined comprised $3.8 billion, or 64.0 percent, of total commercial loans at June 30, 2020 and $3.8 billion, or 68.8 percent, of total commercial loans at December 31, 2019 and 50.4 percent of total portfolio loans at June 30, 2020 and 53.1 percent at December 31, 2019. Further segmentation of the CRE and commercial construction portfolios by collateral type reveals no concentration in excess of 14 percent of both total CRE and commercial construction loans at June 30, 2020 and 11 percent at December 31, 2019. We lend primarily in Pennsylvania and the contiguous states of Ohio, New York, West Virginia and Maryland. The majority of our commercial and consumer loans are made to businesses and individuals in this geography, resulting in a concentration. We believe our knowledge and familiarity with customers and conditions locally outweighs this geographic concentration risk. The conditions of the local and regional economies are monitored closely through publicly available data and information supplied by our customers. We also use subscription services for additional geographic and industry specific information. Our CRE and commercial construction portfolios have exposure outside of this geography of 5.7 percent of the combined portfolios and 3.0 percent of total portfolio loans at June 30, 2020. This compares to 5.4 percent of the combined portfolios and 2.9 percent of total portfolio loans at December 31, 2019. We individually evaluate all substandard and nonaccrual commercial loans that have experienced a forbearance or change in terms agreement, and all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan, to determine if they should be designated as troubled debt restructurings, or TDRs. All TDRs will be reported as such for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is fully expected that the remaining principal and interest will be collected according to the restructured agreement. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring. The following tables summarize restructured loans as of the dates presented: June 30, 2020 (dollars in thousands) Performing Nonperforming Total Commercial real estate $ 25 $ 27,100 $ 27,125 Commercial and industrial 4,388 2,068 6,456 Commercial construction 3,997 — 3,997 Business banking 1,488 349 1,837 Consumer real estate 5,635 2,238 7,873 Other consumer 3 — 3 Total (1) $ 15,536 $ 31,755 $ 47,291 (1) Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. December 31, 2019 (dollars in thousands) Performing Nonperforming Total Commercial real estate $ 22,233 $ 6,713 $ 28,946 Commercial and industrial 6,909 695 7,604 Commercial construction 1,425 — 1,425 Residential mortgage 2,013 822 2,835 Home equity 4,371 678 5,049 Installment and other consumer 9 4 13 Total $ 36,960 $ 8,912 $ 45,872 The significant increases in nonperforming TDRs at June 30, 2020 compared to December 31, 2019 was primarily related to a $20.5 million CRE relationship and a $4.3 million C&I relationship. The $20.5 million CRE relationship became a performing TDR in the third quarter of 2019 and then moved to nonperforming in the first quarter of 2020 when the borrower experienced financial deterioration that lead to cash flow issues. The relationship was individually assessed at June 30, 2020, and based upon updated appraisals, a $0.6 million ACL was added due to the relationship being under-collateralized as of June 30, 2020. There were four TDRs totaling $0.1 million that returned to accruing status during the three and six months ended June 30, 2020. There were three TDRs totaling $0.1 million that returned to accruing status during the three months ended June 30, 2019 and four TDRs totaling $1.8 million that returned to accruing status during the six months ended June 30, 2019. The following tables present the restructured loans by portfolio segment and by type of concession for the three and six months ended June 30, 2020: Three Months Ended June 30, 2020 Six Months Ended June 30, 2020 (dollars in thousands) Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Totals by Loan Segment Commercial Real Estate Principal deferral and maturity date extension — — — — 1 2,210 2,210 — Total Commercial Real Estate — — — — 1 2,210 2,210 — Commercial and Industrial Maturity date extension and interest rate reduction 1 75 75 — 1 75 75 — Principal deferral and maturity date extension — — — — 1 2,467 2,068 (399) Payment deferral resulting in payment delay 1 93 27 — (66) 1 93 27 (66) Total Commercial and Industrial 2 168 102 (66) 3 2,635 2,170 (465) Commercial Construction Maturity date extension 2 701 701 — 3 2,592 2,572 (20) Total Commercial Construction 2 701 701 — 3 2,592 2,572 (20) Residential Mortgage Consumer bankruptcy (2) 1 160 160 — 1 160 160 — Maturity date extension and payment reduction 2 150 150 — 3 177 177 — Total Residential Mortgage 3 310 310 — 4 337 337 — Home Equity Consumer bankruptcy (2) 4 191 191 — 9 567 564 (3) Total Home Equity 4 191 191 — 9 567 564 (3) Totals by Concession Type Principal deferral and maturity date extension — — — — 2 4,677 4,278 (399) Maturity date extension and interest rate reduction 1 75 75 — 1 75 75 — Payment deferral resulting in payment delay 1 93 27 (66) 1 93 27 (66) Maturity date extension 2 701 701 — 3 2,592 2,572 (20) Consumer bankruptcy (2) 5 351 351 — 10 727 724 (3) Maturity date extension and payment reduction 2 150 150 — 3 177 177 — Total (3) 11 $ 1,370 $ 1,304 $ (66) 20 $ 8,341 $ 7,853 $ (488) (1) 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. (2) Consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (3) Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The following tables present the restructured loans by portfolio segment and by type of concession for the three and six months ended June 30, 2019: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 (dollars in thousands) Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Totals by Loan Segment Commercial Real Estate Maturity date extension 1 1,322 1,311 (11) 1 1,322 1,311 (11) Maturity date extension and interest rate reduction 1 151 148 (3) 1 151 148 (3) Principal forgiveness 1 4,690 4,631 (59) 1 4,690 4,631 (59) Total Commercial Real Estate 3 6,163 6,090 (73) 3 6,163 6,090 (73) Commercial and Industrial Maturity date extension and interest rate reduction — — — — 1 4,751 4,529 (222) Total Commercial and Industrial — — — — 1 4,751 4,529 (222) Commercial Construction Total Commercial Construction — — — — — — — — Residential Mortgage Consumer bankruptcy (2) 2 116 115 (1) 3 166 163 (3) Total Residential Mortgage 2 116 115 (1) 3 166 163 (3) Home Equity Consumer bankruptcy (2) 6 107 105 (2) 13 298 268 (30) Interest rate reduction 1 109 108 (1) 2 190 189 (1) Total Home Equity 7 216 213 (3) 15 488 457 (31) Installment and Other Consumer Consumer bankruptcy (2) 2 9 9 — 3 9 9 — Total Installment and Other Consumer $ 2 $ 9 $ 9 $ — $ 3 $ 9 $ 9 $ — Totals by Concession Type Maturity date extension 1 1,322 1,311 (11) 1 1,322 1,311 (11) Maturity date extension and interest rate reduction 1 151 148 (3) 2 4,902 4,677 (225) Principal forgiveness 1 4,690 4,631 (59) 1 4,690 4,631 (59) Consumer bankruptcy (2) 10 232 229 (3) 19 473 440 (33) Interest rate reduction 1 109 108 (1) 2 190 189 (1) Total (3) 14 $ 6,504 $ 6,427 $ (77) 25 $ 11,577 $ 11,248 $ (329) (1) 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. (2) Consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (3) Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. In response to the coronavirus, or COVID-19, pandemic and its economic impact on our customers, we implemented a short-term modification program that complies with the CARES Act to provide temporary payment relief to those borrowers directly impacted by COVID-19 who were not more than 30 days past due as of December 31, 2019. This program allows for a deferral of payments for 90 days and up to a maximum of 180 days for our commercial customers. The customer remains responsible for deferred payments along with any additional interest accrued during the deferral period. For our consumer customers interest does not accrue during the deferral period and the maturity date is extended by the length of the deferral period. Under the applicable guidance, none of these loans were considered restructured as of June 30, 2020. As of June 30, 2020 we had 2,360 loans that were modified totaling $1.4 billion. As of June 30, 2020, we had 22 commitments to lend an additional $3.1 million on TDRs. Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place. There was one TDR that defaulted during the three months ended June 30, 2020 totaling $0.1 million and 11 TDRs totaling $21.1 million that defaulted during the six months ended June 30, 2020 that were restructured within the last 12 months prior to defaulting. The large increase in defaulted TDRs is related to one CRE customer with five notes totaling $20.5 million discussed above. There were no TDRs that defaulted during the three and six months ended June 30, 2019 that were restructured within the last 12 months prior to defaulting. The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) June 30, 2020 December 31, 2019 Nonperforming Assets Nonaccrual loans $ 58,358 $ 45,145 Nonaccrual TDRs 31,755 8,912 Total Nonaccrual Loans 90,113 54,057 OREO 2,740 3,525 Total Nonperforming Assets $ 92,853 $ 57,582 The significant increases in nonperforming loans primarily related to the addition of a $20.5 million CRE relationship, the $10.9 million lending relationship related to the customer fraud and a $4.3 million C&I relationship. The $20.5 million CRE relationship became a performing TDR in the third quarter of 2019 and then moved to nonperforming in the first quarter of 2020 when the borrower experienced financial deterioration that led to cash flow issues. The relationship was individually assessed at June 30, 2020, and based upon updated appraisals, a $0.6 million ACL was added due to the relationship being under-collateralized as of June 30, 2020. The $10.9 million lending relationship was moved to nonperforming in the second quarter of 2020.

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
ALLOWANCE FOR CREDIT LOSSES	ALLOWANCE FOR CREDIT LOSSES We maintain an ACL at a level determined to be adequate to absorb estimated expected credit losses within the loan portfolio over the contractual life of an instrument that considers our historical loss experience, current conditions and forecasts of future economic conditions as of the balance sheet date. We develop and document a systematic ACL methodology based on the following portfolio segments: 1) Construction, 2) Commercial Real Estate, or CRE, 3) Commercial and Industrial, or C&I, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. The following are key risks within each portfolio segment: CRE —Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, retail, multifamily, and health care. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied. C&I —Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often does not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt. Commercial Construction —Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer. Business Banking —Commercial loans made to small businesses that are standard, non-complex products evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards that meet small business market customers’ needs. The business banking portfolio is monitored by utilizing a standard and closely managed process focusing on behavioral and performance criteria. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and business. Consumer Real Estate —Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt. Other Consumer —Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values. Management monitors various credit quality indicators for the commercial, business banking and consumer loan portfolios, including changes in risk ratings, nonperforming status and delinquency on a monthly basis. We monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard. Our risk ratings are consistent with regulatory guidance and are as follows: Pass —The loan is currently performing and is of high quality. Special Mention —A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Substandard —A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Doubtful —Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions, and values, highly questionable and improbable. The following table presents loan balances by year of origination and internally assigned risk rating for our portfolio segments as of June 30, 2020: Risk Rating (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 231,670 $ 468,786 $ 443,243 $ 327,871 $ 401,126 $ 769,224 $ 48,527 — $ 2,690,447 Special Mention — 8,741 187 13,182 8,172 50,717 2,350 — 83,349 Substandard — — 938 9,098 22,059 49,912 2,890 — 84,897 Doubtful — — — — 471 2,859 80 — 3,410 Total Commercial Real Estate 231,670 477,527 444,368 350,151 431,828 872,712 53,847 — 2,862,103 Commercial and Industrial Pass 350,890 224,067 162,559 88,479 56,286 301,155 383,176 44 1,566,656 Special Mention 39 14,104 3,722 917 6,977 10,302 42,199 — 78,260 Substandard 75 5,417 2,799 14,979 75 11,354 3,061 — 37,760 Doubtful — — — — — — — — — Total Commercial and Industrial 351,004 243,588 169,080 104,375 63,338 322,811 428,436 44 1,682,676 Commercial Construction Pass 67,685 206,187 107,927 17,499 17,335 10,533 11,844 — 439,010 Special Mention — — 3,581 — — 5,076 91 — 8,748 Substandard — — — 1,742 — 3,598 — — 5,340 Doubtful — — — — — — — — — Total Commercial Construction 67,685 206,187 111,508 19,241 17,335 19,207 11,935 — 453,098 Business Banking Pass 289,837 171,903 142,912 99,586 88,874 310,932 110,498 1,247 1,215,789 Special Mention — 100 1,341 1,742 1,144 7,071 733 69 12,200 Substandard — 627 3,115 4,616 4,036 27,566 680 206 40,846 Doubtful — — — — — — — — — Total Business Banking 289,837 172,630 147,368 105,944 94,054 345,569 111,911 1,522 1,268,835 Consumer Real Estate Pass 59,273 143,091 81,972 79,203 87,809 309,636 421,987 7,123 1,190,094 Special Mention — — — — 798 300 — — 1,098 Substandard — 188 299 812 973 8,447 202 — 10,921 Doubtful — — — — — — — — — Total Consumer Real Estate 59,273 143,279 82,271 80,015 89,580 318,383 422,189 7,123 1,202,113 Other consumer Pass 4,720 16,987 9,223 5,323 4,256 1,561 30,377 268 72,715 Special Mention — — — — — — — — — Substandard — 559 145 117 691 4,839 408 259 7,018 Doubtful — — — — — — — — — Total Other Consumer 4,720 17,546 9,368 5,440 4,947 6,400 30,785 527 79,733 Total Loan Balance $ 1,004,189 $ 1,260,757 $ 963,963 $ 665,166 $ 701,082 $ 1,885,082 $ 1,059,103 $ 9,216 $ 7,548,558 We monitor the delinquent status of the commercial and consumer portfolios on a monthly basis. Loans are considered nonperforming when interest and principal are 90 days or more past due or management has determined that a material deterioration in the borrower’s financial condition exists. The risk of loss is generally highest for nonperforming loans. The following table presents loan balances by year of origination and performing and nonperforming status for our portfolio segments as of June 30, 2020: (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Performing $ 231,670 $ 477,527 $ 444,368 $ 350,151 $ 411,792 $ 839,942 $ 50,877 $ — $ 2,806,327 Nonperforming — — — — 20,036 32,770 2,970 — 55,776 Total Commercial Real Estate 231,670 477,527 444,368 350,151 431,828 872,712 53,847 — 2,862,103 Commercial and Industrial Performing 351,004 243,588 168,814 104,375 63,338 322,811 426,076 44 1,680,050 Nonperforming — — 266 — — — 2,360 — 2,626 Total Commercial and Industrial 351,004 243,588 169,080 104,375 63,338 322,811 428,436 44 1,682,676 Commercial Construction Performing 67,685 206,187 111,508 18,200 17,335 18,744 11,935 — 451,594 Nonperforming — — — 1,041 — 463 — — 1,504 Total Commercial Construction 67,685 206,187 111,508 19,241 17,335 19,207 11,935 — 453,098 Business Banking Performing 289,837 172,290 145,563 104,549 92,708 334,316 111,696 1,401 1,252,360 Nonperforming — 340 1,805 1,395 1,346 11,253 215 121 16,475 Total Business Banking 289,837 172,630 147,368 105,944 94,054 345,569 111,911 1,522 1,268,835 Consumer Real Estate Performing 59,273 143,174 81,327 78,888 88,576 309,984 421,895 7,123 1,190,240 Nonperforming — 105 944 1,127 1,004 8,399 294 — 11,873 Total Consumer Real Estate 59,273 143,279 82,271 80,015 89,580 318,383 422,189 7,123 1,202,113 Other Consumer Performing 4,720 17,069 9,368 5,338 4,664 5,630 30,594 491 77,874 Nonperforming — 477 — 102 283 770 191 36 1,859 Total Other Consumer 4,720 17,546 9,368 5,440 4,947 6,400 30,785 527 79,733 Performing 1,004,189 1,259,835 960,948 661,501 678,413 1,831,427 1,053,073 9,059 7,458,445 Nonperforming — 922 3,015 3,665 22,668 53,655 6,030 157 90,113 Total Loan Balance $ 1,004,189 $ 1,260,757 $ 963,963 $ 665,166 $ 701,082 $ 1,885,082 $ 1,059,103 $ 9,216 $ 7,548,558 The following tables present the age analysis of past due loans segregated by class of loans as of the dates presented: June 30, 2020 (2) (dollars in thousands) Current 30-59 Days 60-89 Days 90 Days Past Due (1) Non - performing Total Past Total Loans Commercial real estate $ 2,806,327 $ — $ — $ — $ 55,776 $ 55,776 $ 2,862,103 Commercial and industrial 1,678,314 — 230 1,506 2,626 4,362 1,682,676 Commercial construction 451,594 — — — 1,504 1,504 453,098 Business banking 1,248,611 839 2,910 — 16,475 20,224 1,268,835 Consumer real estate 1,184,530 1,429 3,709 572 11,873 17,583 1,202,113 Other consumer 77,420 201 131 122 1,859 2,313 79,733 Total $ 7,446,796 $ 2,469 $ 6,980 $ 2,200 $ 90,113 $ 101,762 $ 7,548,558 (1) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at June 30, 2020. (2) We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans. December 31, 2019 (dollars in thousands) Current 30-59 Days 60-89 Days 90 Days Past Due (1) Non - performing Total Past Total Loans Commercial real estate $ 3,025,505 $ 7,749 $ 71 $ 911 $ 25,356 $ 34,087 $ 3,059,592 Commercial and industrial 1,466,460 126 1,589 1,443 10,911 14,069 1,480,529 Commercial construction 367,204 956 1,163 — 737 2,856 370,060 Business banking 830,735 5,093 1,099 — 9,863 16,055 846,790 Consumer real estate 1,283,591 2,620 1,758 1,175 6,063 11,616 1,295,207 Other consumer 81,866 1,448 305 228 1,127 3,108 84,974 Total $ 7,055,361 $ 17,992 $ 5,985 $ 3,757 $ 54,057 $ 81,791 $ 7,137,152 (1) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at December 31, 2019. The following table presents loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: June 30, 2020 June 30, 2020 For the three months ended For the six months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Past Due 90+ Days Still Accruing Interest Income Recognized on Nonaccrual (1) Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 25,356 $ 55,776 $14,889 $ — $3 $12 Commercial and industrial 10,911 2,626 — 1,506 9 23 Commercial construction 737 1,504 1,218 — — — Business banking 9,863 16,475 3,002 — 57 104 Consumer real estate 6,063 11,873 398 572 75 170 Other consumer 1,127 1,859 — 122 1 3 Total $ 54,057 $ 90,113 $19,507 $ 2,200 $145 $312 (1) Represents only cash payments received and applied to interest on nonaccrual loans. The following table presents collateral-dependent loans by class of loan: June 30, 2020 Type of Collateral (dollars in thousands) Real Estate Blanket Lien Investment/Cash Other Commercial real estate $55,447 $40 $— $— Commercial and industrial 2,762 3,694 — — Commercial construction 5,215 — — — Business banking 2,906 896 — 689 Consumer real estate 398 — — — Total $66,728 $4,630 $— $689 The following table presents activity in the ACL for the three and six months ended June 30, 2020: Three Months Ended June 30, 2020 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 42,611 $ 19,870 $ 6,606 $ 13,706 $ 11,200 $ 2,857 $ 96,850 Provision for credit losses on loans 20,681 60,906 2,249 918 400 677 85,831 Charge-offs (5,600) (61,616) — (260) (37) (790) (68,303) Recoveries 38 4 19 40 22 108 231 Net (Charge-offs)/Recoveries (5,562) (61,612) 19 (220) (15) (682) (68,072) Balance at End of Period $ 57,730 $ 19,164 $ 8,874 $ 14,404 $ 11,585 $ 2,852 $ 114,609 Six Months Ended June 30, 2020 (dollars in thousands) Commercial Commercial and Commercial Business Banking (1) Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 30,577 $ 15,681 $ 7,900 $ — $ 6,337 $ 1,729 $ 62,224 Impact of CECL adoption 4,810 7,853 (3,376) 12,898 4,525 642 27,352 Provision for credit losses on loans 28,345 67,104 4,329 2,126 829 1,529 104,262 Charge-offs (6,042) (71,496) — (721) (218) (1,272) (79,749) Recoveries 40 22 21 101 112 224 520 Net (Charge-offs)/Recoveries (6,002) (71,474) 21 (620) (106) (1,048) (79,229) Balance at End of Period $ 57,730 $ 19,164 $ 8,874 $ 14,404 $ 11,585 $ 2,852 $ 114,609 (1) In connection with our adoption of ASU 2016-13, we made changes to our loan portfolio segments to align with the methodology applied in determining the allowance under CECL. Our new segmentation breaks out business banking loans from our other loan segments: CRE, C&I, commercial construction, consumer real estate and other consumer. The business banking allowance balance at the beginning of period is included in the other segments and reclassified to business banking through the impact of CECL adoption line. The adoption of ASU 2016-13 During the three months ended June 30, 2020, we had a charge-off of $58.7 million related to a previously disclosed customer fraud resulting from a check kiting scheme. The fraud was perpetrated by a single business customer and a criminal investigation is ongoing. The check kiting scheme resulted in a deposit account overdraft, which became a loan to us that was charged off through the ACL. The customer also had a lending relationship that was originally $15.1 million, including a $14.3 million CRE loan and a $0.8 million line of credit. We recognized a $4.2 million charge-off related to this lending relationship during the three months ended June 30, 2020 and the remaining outstanding balance of $10.9 million is a nonperforming loan at June 30, 2020. We added $14.4 million and $29.3 million to the ACL related to qualitative factors for the three and six months ended June 30, 2020. Included in these amounts were $14.8 million for the three months ended and $26.0 million for the sixth months ended for the economic forecast and an allocation for our hotel portfolio due to the COVID-19 pandemic. Our forecast covers a period of two years and is driven in part by national unemployment data. Changes in our current conditions qualitative factors resulted in a decrease of $0.4 million and an increase of $3.3 million to the ACL for the three and six months ended June 30, 2020. The C&I portfolio included $547.6 million of loans originated under the PPP at June 30, 2020. The loans are 100 percent guaranteed by the SBA, therefore, we have not assigned any ACL at June 30, 2020. Prior to the adoption of ASU 326 on January 1, 2020, we calculated our allowance for loan losses using an incurred loan loss methodology. The following tables are disclosures related to the allowance for loan losses in prior periods. The following table presents the recorded investment in commercial loan classes by internally assigned risk ratings as of December 31, 2019: December 31, 2019 (dollars in thousands) Commercial % of Commercial % of Commercial % of Total % of Pass $ 3,270,437 95.7 % $ 1,636,314 93.4 % $ 347,324 92.5 % $ 5,254,076 95.3 % Special mention 57,285 1.7 % 36,484 1.7 % 10,109 2.7 % 103,878 1.9 % Substandard 86,772 2.5 % 47,980 4.9 % 17,899 4.8 % 152,651 2.8 % Doubtful 2,023 — % 55 — % 133 — % 2,191 — % Total $ 3,416,518 100.0 % $ 1,720,833 100.0 % $ 375,445 100.0 % $ 5,512,796 100.0 % The following table presents the recorded investment in consumer loan classes by performing and nonperforming status as of December 31, 2019: December 31, 2019 (dollars in thousands) Residential % of Home % of Installment % of Consumer % of Total % of Performing $ 991,066 99.2 % $ 535,709 99.5 % $ 78,993 99.9 % $ 8,390 100.0 % $ 1,614,158 99.4 % Nonperforming 7,519 0.8 % 2,639 0.5 % 40 0.1 % — — % 10,198 0.6 % Total $ 998,585 100.0 % $ 538,348 100.0 % $ 79,033 100.0 % $ 8,390 100.0 % $ 1,624,356 100.0 % The following table presents investments in loans considered to be impaired and related information on those impaired loans as of December 31, 2019: December 31, 2019 (dollars in thousands) Recorded Unpaid Related With a related allowance recorded: Commercial real estate $ 13,011 $ 14,322 $ 2,023 Commercial and industrial 10,001 10,001 55 Commercial construction 489 489 113 Consumer real estate — — — Other consumer 9 9 9 Total with a Related Allowance Recorded 23,510 24,821 2,200 Without a related allowance recorded: Commercial real estate 34,909 40,201 — Commercial and industrial 7,605 10,358 — Commercial construction 1,425 2,935 — Consumer real estate 7,884 8,445 — Other consumer 4 11 — Total without a Related Allowance Recorded 51,827 61,950 — Total: Commercial real estate 47,920 54,523 2,023 Commercial and industrial 17,606 20,359 55 Commercial construction 1,914 3,424 113 Consumer real estate 7,884 8,445 — Other consumer 13 20 9 Total $ 75,337 $ 86,771 $ 2,200 The following table presents average recorded investment and interest income recognized on impaired loans for the three and six months ended June 30, 2019: Three months ended Six months ended June 30, 2019 June 30, 2019 (dollars in thousands) Average Interest Average Interest With a related allowance recorded: Commercial real estate $ 7,703 $ — $ 7,704 $ — Commercial and industrial 758 13 772 26 Commercial construction 489 — 489 — Consumer real estate 666 — 666 — Other consumer 16 — 18 1 Total with a Related Allowance Recorded 9,632 13 9,649 27 Without a related allowance recorded: Commercial real estate 21,802 77 22,093 124 Commercial and industrial 7,568 131 5,329 189 Commercial construction 2,319 48 2,319 83 Consumer real estate 7,952 93 7,979 188 Other consumer 3 — 4 — Total without a Related Allowance Recorded 39,644 349 37,724 584 Total: Commercial real estate 29,505 77 29,797 124 Commercial and industrial 8,326 144 6,101 215 Commercial construction 2,808 48 2,808 83 Consumer real estate 8,618 93 8,645 188 Other consumer 19 — 22 1 Total $ 49,276 $ 362 $ 47,373 $ 611 The following table details activity in the allowance for loan losses for the three and six months ended June 30, 2019: Three Months Ended June 30, 2019 (dollars in thousands) Commercial Commercial and Commercial Consumer Other Total Balance at beginning of period $ 34,903 $ 11,996 $ 6,757 $ 6,178 $ 1,575 $ 61,409 Charge-offs (528) (1,435) — (247) (457) (2,667) Recoveries 6 91 2 344 89 532 Net (Charge-offs)/Recoveries (522) (1,344) 2 97 (368) (2,135) Provision for credit losses (1,545) 2,575 495 296 384 2,205 Balance at End of Period $ 32,836 $ 13,227 $ 7,254 $ 6,571 $ 1,591 $ 61,479 Six Months Ended June 30, 2019 (dollars in thousands) Commercial Commercial and Commercial Consumer Other Total Balance at beginning of period $ 33,707 $ 11,596 $ 7,983 $ 6,187 $ 1,523 $ 60,996 Charge-offs (529) (6,912) — (410) (840) (8,691) Recoveries 128 508 3 492 189 1,320 Net (Charge-offs)/Recoveries (401) (6,404) 3 82 (651) (7,371) Provision for credit losses (470) 8,035 (732) 302 719 7,854 Balance at End of Period $ 32,836 $ 13,227 $ 7,254 $ 6,571 $ 1,591 $ 61,479 The following tables present the allowance for loan losses and recorded investments in loans by category as of December 31, 2019: December 31, 2019 Allowance for Loan Losses Portfolio Loans (dollars in thousands) Individually Collectively Total Individually Collectively Total Commercial real estate $ 2,023 $ 28,554 $ 30,577 $ 47,920 $ 3,368,598 $ 3,416,518 Commercial and industrial 55 15,626 15,681 17,606 1,703,227 1,720,833 Commercial construction 113 7,787 7,900 1,914 373,531 375,445 Consumer real estate — 6,337 6,337 7,884 1,537,439 1,545,323 Other consumer 9 1,720 1,729 13 79,020 79,033 Total $ 2,200 $ 60,024 $ 62,224 $ 75,337 $ 7,061,815 $ 7,137,152

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Interest Rate Swaps In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates. Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial. Derivatives contain an element of credit risk, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive (Loss) Income. Interest Rate Lock Commitments and Forward Sale Contracts In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for a period of 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive (Loss) Income. The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented: Derivatives Derivatives (dollars in thousands) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts - Commercial Loans Fair value $ 94,371 $ 25,647 $ 94,286 $ 25,615 Notional amount 930,074 740,762 930,074 740,762 Collateral posted — — 91,730 26,127 Interest Rate Lock Commitments - Mortgage Loans Fair value 2,583 321 — — Notional amount 59,677 9,829 — — Forward Sale Contracts - Mortgage Loans Fair value — 1 594 — Notional amount $ — $ 12,750 $ 62,617 $ — Presenting offsetting derivatives that are subject to legally enforceable netting arrangements with the same party is permitted. For example, we may have a derivative asset and a derivative liability with the same counterparty to a swap transaction and we are permitted to offset the asset position and the liability position resulting in a net presentation. The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented: Derivatives Derivatives (dollars in thousands) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 98,649 $ 26,146 $ 98,564 $ 26,114 Gross amounts offset (4,278) (499) (4,278) (499) Net Amounts Presented in the Consolidated Balance Sheets 94,371 25,647 94,286 25,615 Gross amounts not offset (1) — — (91,730) (26,127) Net Amount $ 94,371 $ 25,647 $ 2,556 $ (512) (1) Amounts represent collateral posted for the periods presented. The following table indicates the gain or loss recognized in income on derivatives for the periods presented: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands) 2020 2019 2020 2019 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ (62) $ 26 $ 52 $ (96) Interest rate lock commitments—mortgage loans 186 310 2,792 398 Forward sale contracts—mortgage loans 698 (193) (595) (160) Total Derivatives Gain/(Loss) $ 822 $ 143 $ 2,249 $ 142

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS Short-term borrowings are for terms under or equal to one year and are comprised of securities sold under repurchase agreements, or REPOs and FHLB advances. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation, or FDIC. Securities pledged as collateral under these REPO financing arrangements cannot be sold or repledged by the secured party and, therefore, the REPOs are accounted for as secured borrowings. Mortgage-backed securities with amortized cost of $92.3 million and carrying value of $97.0 million at June 30, 2020 and amortized cost of $22.7 million and carrying value of $23.0 million at December 31, 2019, were pledged as collateral for these secured transactions. The pledged securities are held in safekeeping at the Federal Reserve. Due to the overnight short-term nature of REPOs, potential risk due to a decline in the value of the pledged collateral is low. Collateral pledging requirements with REPOs are monitored daily. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans. Long-term borrowings are for original terms greater than one year and are comprised of FHLB advances, finance leases and junior subordinated debt securities. Long-term FHLB advances are secured by the same loans as short-term FHLB advances. We had total long-term borrowings outstanding of $2.9 million at a fixed and $45.1 million at a variable rate at June 30, 2020, excluding our finance leases. Information pertaining to borrowings is summarized in the table below as of the dates presented: June 30, 2020 December 31, 2019 (dollars in thousands) Balance Weighted Balance Weighted Short-term Borrowings Securities sold under repurchase agreements $ 92,159 0.25 % $ 19,888 0.74 % Short-term borrowings 84,541 0.38 % 281,319 1.84 % Total Short-term Borrowings 176,700 0.31 % 301,207 1.76 % Long-term Borrowings Long-term borrowings 49,489 2.48 % 50,868 2.60 % Junior subordinated debt securities 64,053 3.31 % 64,277 3.59 % Total Long-term Borrowings 113,542 2.95 % 115,145 3.15 % Total Borrowings $ 290,242 1.34 % $ 416,352 2.14 % We had total borrowings at the FHLB of Pittsburgh of $132.5 million at June 30, 2020 and $532.9 million at December 31, 2019. The $132.5 million at June 30, 2020 consisted of $84.5 million in short-term borrowings and $48.0 million in long-term borrowings. Our maximum borrowing capacity with the FHLB of Pittsburgh was $3.1 billion at June 30, 2020. We utilized $383.9 million of our borrowing capacity at June 30, 2020 consisting of $132.5 million for borrowings and $251.4 million for letters of credit to collateralize public funds. Our remaining borrowing availability at June 30, 2020 is $2.7 billion. We have completed three private placements of trust preferred securities to financial institutions. As a result, we own 100 percent of the common equity of STBA Capital Trust I, DNB Capital Trust I and DNB Capital Trust II, collectively the Trusts. The Trusts were formed to issue mandatorily redeemable capital securities to third-party investors. The proceeds from the sale of the securities and the issuance of the common equity by the Trusts were invested in junior subordinated debt securities issued by us. The Trusts are variable interest entities, and the third-party investors are the primary beneficiaries; therefore, the trusts are not consolidated into our financial statements. The Trusts pays dividends on the securities at the same rate as the interest paid by us on the junior subordinated debt held by the Trusts. DNB Capital Trust I and DNB Capital Trust II were acquired with the DNB merger.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Commitments In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event the customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties. The following table sets forth our commitments and letters of credit as of the dates presented: (dollars in thousands) June 30, 2020 December 31, 2019 Commitments to extend credit $ 2,227,102 $ 1,910,805 Standby letters of credit 82,906 80,040 Total $ 2,310,008 $ 1,990,845 Allowance for Credit Losses on Unfunded Loan Commitments We maintain an allowance for credit losses on unfunded commercial lending commitments and letters of credit to provide for the risk of loss inherent in these arrangements. The allowance is computed using a methodology similar to that used to determine the allowance for credit losses for loans, modified to take into account the probability of a draw-down on the commitment. The provision for credit losses on unfunded loan commitments is included in the provision for credit losses on our Consolidated Statements of Comprehensive (Loss) Income. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The activity in the allowance for credit losses on unfunded loan commitments for the three and six months ended June 30, 2020 was as follows: (dollars in thousands) Three Months Ended Balance at March 31, 2020 $ 6,077 Provision for credit losses 927 Total $ 7,004 (dollars in thousands) Six Months Ended Balance at December 31, 2019 $ 3,112 Impact of adopting ASU 2016-13 1,349 January 1, 2020 4,461 Provision for credit losses 2,543 Total $ 7,004 The increase in allowance for credit losses on unfunded loan commitments for both the three and six months ended June 30, 2020 was due to higher expected credit losses due to the COVID-19 pandemic. Litigation In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims pending will not have a material adverse effect on our consolidated financial position or results of operations.

Revenue From Contracts With Cus

Revenue From Contracts With Customers	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS	REVENUE FROM CONTRACTS WITH CUSTOMERS We earn revenue from contracts with our customers when we have completed our performance obligations and recognize that revenue when services are provided to our customers. Our contracts with customers are primarily in the form of account agreements. Generally, our services are transferred at a point in time in response to transactions initiated and controlled by our customers under service agreements with an expected duration of one year or less. Our customers have the right to terminate their service agreements at any time. We do not defer incremental direct costs to obtain contracts with customers that would be amortized in one year or less. These costs are primarily salaries and employee benefits recognized as expense in the period incurred. Service charges on deposit accounts - We recognize monthly service charges for both commercial and personal banking customers based on account fee schedules. Our performance obligation is generally satisfied and the related revenue recognized at a point in time or over time when the services are provided. Other fees are earned based on specific transactions or customer activity within the customers' deposit accounts. These are earned at the time the transaction or customer activity occurs. Debit and credit card services - Interchange fees are earned whenever debit and credit cards are processed through third-party card payment networks. ATM fees are based on transactions by our customers' and other customers' use of our ATMs or other ATMs. Debit and credit card revenue is recognized at a point in time when the transaction is settled. Our performance obligation to our customers is generally satisfied and the related revenue is recognized at a point in time when the service is provided. Third-party service contracts include annual volume and marketing incentives which are recognized over a period of twelve months when we meet thresholds as stated in the service contract. Wealth management services - Wealth management services are primarily comprised of fees earned from the management and administration of trusts, assets under administration and other financial advisory services. Generally, wealth management fees are earned over a period of time between monthly and annually, per the related fee schedules. Our performance obligations with our customers are generally satisfied when we provide the services as stated in the customers' agreements. The fees are based on a fixed amount or a scale based on the level of services provided or amount of assets under management. Other fee revenue - Other fee revenue includes a variety of other traditional banking services such as, electronic banking fees, letters of credit origination fees, wire transfer fees, money orders, treasury checks, checksale fees and transfer fees. Our performance obligations are generally satisfied at a point in time, while fee revenue is recognized when the services are provided or the transaction is settled. The information presented in the following table presents the point of revenue recognition for revenue from contracts with customers. Other revenue streams such as: interest income, net securities gains and losses, insurance, mortgage banking and other revenues that are accounted for under other generally accepted accounting principles are excluded. (dollars in thousands) Three Months Ended June 30, Six Months Ended June 30, Revenue Streams Point of Revenue Recognition 2020 2019 2020 2019 Service charges on deposit accounts Over a period of time $ 440 $ 451 $ 924 $ 908 At a point in time 1,902 2,761 4,976 5,457 $ 2,342 $ 3,212 $ 5,900 $ 6,365 Debit and credit card Over a period of time $ 184 $ 177 $ 378 $ 362 At a point in time 3,428 3,324 6,715 6,114 $ 3,612 $ 3,501 $ 7,093 $ 6,476 Wealth management Over a period of time $ 652 $ 409 $ 997 $ 822 At a point in time 1,934 1,653 3,952 3,287 $ 2,586 $ 2,062 $ 4,949 $ 4,109 Other fee revenue At a point in time $ 874 $ 1,145 $ 1,793 $ 2,064

Other Comprehensive Income_(Los

Other Comprehensive Income/(Loss)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
OTHER COMPREHENSIVE INCOME/(LOSS)	OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 (dollars in thousands) Pre-Tax Tax Net of Tax Pre-Tax Tax Benefit (Expense) Net of Tax Change in net unrealized gains/(losses) on debt securities available-for-sale $ 4,201 $ (894) $ 3,307 $ 8,968 $ (1,912) $ 7,056 Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1) (142) 30 (112) — — — Adjustment to funded status of employee benefit plans 464 (99) 365 452 (96) 356 Other Comprehensive Income (Loss) $ 4,523 $ (963) $ 3,560 $ 9,420 $ (2,008) $ 7,412 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 (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 $ 25,765 $ (5,482) $ 20,283 $ 16,366 $ (3,490) $ 12,876 Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1) (142) 30 (112) — — — Adjustment to funded status of employee benefit plans 929 (198) 731 905 (193) 712 Other Comprehensive Income/(Loss) $ 26,552 $ (5,650) $ 20,902 $ 17,271 $ (3,683) $ 13,588 (1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive (Loss) Income as follows: the pre-tax amount is included in net gain on sale of securities, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

Employee Benefits

Employee Benefits	6 Months Ended
	Jun. 30, 2020
Retirement Benefits [Abstract]
EMPLOYEE BENEFITS	EMPLOYEE BENEFITS Our qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plans in 2016. We will continue recording pension expense related to these plans, primarily representing interest costs on the accumulated benefit obligation and amortization of actuarial losses accumulated in the plans, as well as income from expected investment returns on pension assets. Since the plans have been frozen, no service costs are included in net periodic pension expense. The defined benefit plan of DNB was merged into S&T's defined benefit plan at November 30, 2019 and the components of net periodic pension cost at June 30, 2020 include the impact of the addition of the DNB defined benefit plan. The investment policy for S&T's defined benefit plan is 90 percent fixed income and 10 percent equity and cash. The expected long-term rate of return on plan assets is 3.45 percent compared to 4.80 percent in prior periods. The following table summarizes the components of net periodic pension cost for the periods presented: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands) 2020 2019 2020 2019 Components of Net Periodic Pension Cost Interest cost on projected benefit obligation $ 890 $ 989 $ 1,781 $ 1,978 Expected return on plan assets (971) (1,181) (1,943) (2,361) Net amortization 385 395 769 789 Net Periodic Pension Expense $ 304 $ 203 $ 607 $ 406 The components of net periodic pension expense are included in salaries and employee benefits on the Consolidated Statements of Comprehensive (Loss) Income.

Qualified Affordable Housing

Qualified Affordable Housing	6 Months Ended
	Jun. 30, 2020
Investments in Affordable Housing Projects [Abstract]
QUALIFIED AFFORDABLE HOUSING	QUALIFIED AFFORDABLE HOUSING As part of our responsibilities under the Community Reinvestment Act and due to their favorable federal income tax benefits, we invest in Low Income Housing partnerships, or LIHPs. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. These investments are recorded in other assets on our balance sheet. Our maximum exposure to loss associated with these investments consists of the investments' fair value plus any unfunded commitments as well as the denial of the tax credits if the project is deemed non-compliant. We do not have any loss reserves recorded related to these investments because we believe the likelihood of any loss to be remote. Our investments in LIHPs represent unconsolidated variable interest entities, or VIEs, and the assets and liabilities of the partnerships are not recorded on our balance sheet. We have determined that we are not the primary beneficiary of these VIEs because we do not have the power to direct the activities that most significantly impact their economic performance. Our total investment in qualified affordable housing projects was $7.4 million at June 30, 2020 and $4.8 million at December 31, 2019. Amortization expense, included in other noninterest expense in the Consolidated Statements of Comprehensive (Loss) Income, was $0.5 million and $1.1 million for the three and six months ended June 30, 2020 and $0.7 million and $1.4 million for the three and six months ended June 30, 2019. The amortization expense was offset by tax credits of $0.6 million and $1.1 million for the three and six months ended June 30, 2020 and $0.7 million and $1.5 million for the three and six months ended June 30, 2019 as a reduction to our federal tax provision. On September 11, 2019, we entered into a new qualified affordable housing project and committed to an investment of $10.2 million. As of June 30, 2020, we have invested $5.1 million in this new project. No amortization expense or tax credits will be recognized for this new project until complete, which we expect to be later in 2020.

Share Repurchase Plan

Share Repurchase Plan	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
SHARE REPURCHASE PLAN	SHARE REPURCHASE PLANOn September 16, 2019, our Board of Directors authorized a $50 million share repurchase plan. This repurchase authorization, which is effective through March 31, 2021, permits S&T to repurchase from time to time up to $50 million in aggregate value of shares 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. During the three months ended June 30, 2020, we had no repurchases. During the six months ended June 30, 2020, we repurchased 411,430 common shares at a total cost of $12.6 million, or an average of $30.52 per share. Repurchase activity was suspended in March of 2020 due to the impact of the COVID-19 pandemic.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2020
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, 2019, filed with the Securities and Exchange Commission, or SEC, on March 2, 2020. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.
Reclassification	Reclassification A mounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our results of operations or financial condition.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.
Recently Adopted Accounting Standards Updates, or ASU or Update	Recently Adopted Accounting Standards Updates, or ASU or Update Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, the Financial Accounting Standards Board, or FASB, issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The amendments in this ASU apply to an entity that is a customer in a hosting arrangement that is a service contract. These amendments relate to accounting for implementation costs (e.g., implementation, setup and other upfront costs). These amendments require an entity in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which costs to capitalize and which costs to expense. These amendments require the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This ASU is effective for annual and interim periods beginning after December 15, 2019. We adopted this ASU on January 1, 2020. The amendments in this ASU did not materially impact our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU remove certain disclosures from Topic 820, modify disclosures and/or require additional disclosures. The amendments in this Update required us to change our Fair Value disclosures beginning with the disclosures included in Form 10-Q for the period ended March 31, 2020. We adopted this ASU on January 1, 2020. The amendments in this ASU did not materially impact our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Refer to Note 4, Fair Value Measurements. Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment (Topic 350). The main objective of this ASU is to simplify the current requirements for testing goodwill for impairment by eliminating step two from the goodwill impairment test. The amendments are expected to reduce the complexity and costs associated with performing the goodwill impairment test, which could result in recording impairment charges sooner. This Update is effective for any interim and annual impairment tests in reporting periods in fiscal years beginning after December 15, 2019. We adopted the amendments of this ASU on January 1, 2020. The amendments in this ASU did not have any impact on our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Financial Instruments - Credit Losses On January 1, 2020, we adopted ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which replaces the incurred loss methodology for determining our provision for credit losses, and allowance for credit losses, or ACL, with an expected loss methodology that is referred to as the Current Expected Credit Loss, or CECL, model. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including our loans and off-balance sheet credit exposures. In addition, ASU 2016-13 made changes to the accounting for available-for-sale debt securities. Credit losses related to available-for-sale debt securities (regardless of whether the impairment is considered to be other-than-temporary) will be measured in a manner similar to the present, except that such losses will be recorded as allowances rather than as reductions in the amortized cost of the related securities. We adopted ASU 2016-13 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under ASU 2016-13 while prior period amounts continue to be reported in accordance with previously applicable GAAP. We made the accounting policy election to not measure an ACL for accrued interest receivables for loans and securities. Accrued interest deemed uncollectible will be written off through interest income. The majority of our available-for-sale debt securities are government agency-backed securities for which the risk of loss is minimal, and accordingly the ACL is immaterial. In connection with our adoption of ASU 2016-13, we made changes to our loan portfolio segments to align with the methodology applied in determining the allowance under CECL. Refer to Note 7, Allowance for Credit Losses for further discussion of these portfolio segments. Our new segmentation breaks out business banking loans from our other loan segments: Commercial Real Estate, or CRE, Commercial and Industrial, or C&I, Commercial Construction, Consumer Real Estate and Other Consumer. Business banking loans are commercial loans made to small businesses that are standard, non-complex products and evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards. The following table details the impact of ASU 2016-13 and the reclassification of loans for the identification of new portfolio loan segments under CECL: January 1, 2020 (dollars in thousands) As Reported Under ASU 2016-13 Pre-ASU 2016-13 Impact of ASU 2016-13 Adoption Assets: Loans held for investment (outstanding balance) Commercial real estate $ 2,946,319 $ 3,416,518 $ (470,199) Commercial and industrial 1,458,541 1,720,833 (262,292) Commercial construction 345,263 375,445 (30,182) Business banking 1,092,908 — 1,092,908 Consumer real estate 1,235,352 1,545,323 (309,971) Other consumer 58,769 79,033 (20,264) Allowance for credit losses on loans (89,577) (62,224) (27,353) Total loans held for investment, net $ 7,047,575 $ 7,074,928 $ (27,353) Net deferred tax asset $ 19,317 $ 13,206 $ 6,111 Liabilities: Allowance for credit losses on unfunded loan commitments $ 4,462 $ 3,113 $ 1,349 Equity: Retained earnings $ 738,493 $ 761,083 $ (22,590) The adoption of ASU 2016-13 Accounting Standards Issued But Not Yet Adopted Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans In August 2018, the FASB issued ASU No. 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans. The amendments in this ASU apply to all employers that sponsor defined benefit pension or other postretirement plans. These amendments remove certain disclosures from Topic 715-20 and require additional disclosures. The amendments in this ASU will require S&T to update our employee benefits disclosures beginning with our Form 10-Q for the period ended March 31, 2021. The amendments in this ASU will have no impact on our consolidated financial statements. Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The amendments in this ASU simplifies the accounting for income taxes by removing certain exceptions and improves the consistent application of GAAP by clarifying and amending other existing guidance. The amendments in this ASU will be effective on January 1, 2021 and are not expected to have any impact on our consolidated financial statements. Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments in this ASU provide optional guidance for a limited period of time to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting. The amendments provide optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. Modified contracts that meet certain scope guidance are eligible for relief from the modification accounting requirements in US GAAP. The optional guidance generally allows for the modified contract to be accounted for as a continuation of the existing contract and does not require contract remeasurement at the modification date or reassessment of a previous accounting determination. The amendments in this ASU are effective as of March 12, 2020 through December 31, 2022. We are evaluating the impacts of this ASU and have not yet determined whether LIBOR transition and this ASU will have material effects on our business operations and consolidated financial statements. SEC Release No. 2020-118 - Amendments to Improve Financial Disclosures about Acquisitions and Dispositions of Businesses In May 2020, the Securities and Exchange Commission adopted amendments to the financial disclosure requirements in Regulation S-X for acquisitions and dispositions of businesses, including real estate operations, in Rules 3-05, 3-14, 8-04, 8-05, 8-06, and Article 11, as well as in other related rules and forms. In conjunction with these changes, the Commission also amended the significance tests in the “significant subsidiary” definition in Rule 1-02(w), Securities Act Rule 405, and Exchange Act Rule 12b-2 to improve their application and to assist registrants in making more meaningful determinations of whether a subsidiary or an acquired or disposed business is significant. In addition, to address the unique attributes of investment companies and business development companies, the Commission adopted new requirements regarding fund acquisitions specific to registered investment companies and business development companies. The amendments in this final rule are effective beginning January 1, 2021. We are evaluating the impact of this final rule and we expect these amendments to impact disclosures in our consolidated financial statements relating to any future acquisitions and disposition of businesses.
Allowance for Credit Losses Policy	Allowance for Credit Losses Policy The ACL is a valuation reserve established and maintained by charges against operating income and is deducted from the amortized cost basis of loans to present the net amount expected to be collected on the loans. Loans, or portions thereof, are charged off against the ACL when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off. The ACL is an estimate of expected credit losses, measured over the contractual life of a loan, that considers our historical loss experience, current conditions and forecasts of future economic conditions. Determination of an appropriate ACL is inherently subjective and may have significant changes from period to period. The methodology for determining the ACL has two main components: evaluation of expected credit losses for certain groups of homogeneous loans that share similar risk characteristics and evaluation of loans that do not share risk characteristics with other loans. The ACL for homogeneous loans is calculated using a life-time loss rate methodology with both a quantitative and a qualitative analysis that is applied on a quarterly basis. The ACL model is comprised of six distinct portfolio segments: 1) Construction, 2) CRE, 3) C&I, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. Each segment has a distinct set of risk characteristics monitored by management. We further evaluate the ACL at a disaggregated level which includes type of collateral, loan participations, non-owner occupied and our internal risk rating system for the commercial segments and type of collateral, lien position, and FICO score, for the consumer segments. Historical credit loss experience is the basis for the estimation of expected credit losses. We apply historical loss rates to pools of loans with similar risk characteristics. After consideration of the historic loss calculation, management applies qualitative adjustments to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information at the balance sheet date. Our reasonable and supportable forecast adjustment is based on the unemployment forecast and management judgment. For periods beyond our two year reasonable and supportable forecast, we revert to the historical loss rate. We revert to historical loss rates utilizing a straight-line method over a one year reversion period. The qualitative adjustments for current conditions are based upon changes in lending policies and practices, experience and ability of lending staff, quality of the bank’s loan review system, value of underlying collateral for collateral dependent loans, the existence of and changes in concentrations and other external factors. These modified historical loss rates are multiplied by the outstanding principal balance of each loan to calculate a required reserve. A similar process is employed to calculate a reserve assigned to off-balance sheet commitments, specifically unfunded loan commitments and letters of credit, and any needed reserve is recorded in other liabilities. The ACL for individual loans begins with the use of normal credit review procedures to identify whether a loan no longer shares similar risk characteristics with other pooled loans and therefore, should be individually assessed. We evaluate all commercial loans greater than $0.5 million that meet the following criteria: 1) when it is determined that foreclosure is probable, 2) substandard, doubtful and nonperforming loans when repayment is expected to be provided substantially through the operation or sale of the collateral, 3) any commercial troubled debt restructuring, or TDR, or any loan reasonably expected to become a TDR whether on accrual or nonaccrual status and 4) when it is determined by management that a loan does not share similar risk characteristics with other loans. Specific reserves are established based on the following three acceptable methods for measuring the ACL: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral when the loan is collateral dependent. Our individual loan evaluations consist primarily of the fair value of collateral method because most of our loans are collateral dependent. Collateral values are discounted to consider disposition costs when appropriate. A specific reserve is established or a charge-off is taken if the fair value of the loan is less than the loan balance. Although we believe our process for determining the ACL appropriately considers all the factors that would likely result in credit losses, the process includes subjective elements and may be susceptible to significant change. To the extent actual losses are higher than management estimates, additional provision for credit losses could be required and could adversely affect our earnings or financial position in future periods.
Accounting Standards Issued But Not Yet Adopted	Recently Adopted Accounting Standards Updates, or ASU or Update Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, the Financial Accounting Standards Board, or FASB, issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The amendments in this ASU apply to an entity that is a customer in a hosting arrangement that is a service contract. These amendments relate to accounting for implementation costs (e.g., implementation, setup and other upfront costs). These amendments require an entity in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which costs to capitalize and which costs to expense. These amendments require the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This ASU is effective for annual and interim periods beginning after December 15, 2019. We adopted this ASU on January 1, 2020. The amendments in this ASU did not materially impact our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement - Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU remove certain disclosures from Topic 820, modify disclosures and/or require additional disclosures. The amendments in this Update required us to change our Fair Value disclosures beginning with the disclosures included in Form 10-Q for the period ended March 31, 2020. We adopted this ASU on January 1, 2020. The amendments in this ASU did not materially impact our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Refer to Note 4, Fair Value Measurements. Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment (Topic 350). The main objective of this ASU is to simplify the current requirements for testing goodwill for impairment by eliminating step two from the goodwill impairment test. The amendments are expected to reduce the complexity and costs associated with performing the goodwill impairment test, which could result in recording impairment charges sooner. This Update is effective for any interim and annual impairment tests in reporting periods in fiscal years beginning after December 15, 2019. We adopted the amendments of this ASU on January 1, 2020. The amendments in this ASU did not have any impact on our Consolidated Balance Sheets or Consolidated Statements of Comprehensive (Loss) Income. Financial Instruments - Credit Losses On January 1, 2020, we adopted ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which replaces the incurred loss methodology for determining our provision for credit losses, and allowance for credit losses, or ACL, with an expected loss methodology that is referred to as the Current Expected Credit Loss, or CECL, model. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including our loans and off-balance sheet credit exposures. In addition, ASU 2016-13 made changes to the accounting for available-for-sale debt securities. Credit losses related to available-for-sale debt securities (regardless of whether the impairment is considered to be other-than-temporary) will be measured in a manner similar to the present, except that such losses will be recorded as allowances rather than as reductions in the amortized cost of the related securities. We adopted ASU 2016-13 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under ASU 2016-13 while prior period amounts continue to be reported in accordance with previously applicable GAAP. We made the accounting policy election to not measure an ACL for accrued interest receivables for loans and securities. Accrued interest deemed uncollectible will be written off through interest income. The majority of our available-for-sale debt securities are government agency-backed securities for which the risk of loss is minimal, and accordingly the ACL is immaterial. In connection with our adoption of ASU 2016-13, we made changes to our loan portfolio segments to align with the methodology applied in determining the allowance under CECL. Refer to Note 7, Allowance for Credit Losses for further discussion of these portfolio segments. Our new segmentation breaks out business banking loans from our other loan segments: Commercial Real Estate, or CRE, Commercial and Industrial, or C&I, Commercial Construction, Consumer Real Estate and Other Consumer. Business banking loans are commercial loans made to small businesses that are standard, non-complex products and evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards. The following table details the impact of ASU 2016-13 and the reclassification of loans for the identification of new portfolio loan segments under CECL: January 1, 2020 (dollars in thousands) As Reported Under ASU 2016-13 Pre-ASU 2016-13 Impact of ASU 2016-13 Adoption Assets: Loans held for investment (outstanding balance) Commercial real estate $ 2,946,319 $ 3,416,518 $ (470,199) Commercial and industrial 1,458,541 1,720,833 (262,292) Commercial construction 345,263 375,445 (30,182) Business banking 1,092,908 — 1,092,908 Consumer real estate 1,235,352 1,545,323 (309,971) Other consumer 58,769 79,033 (20,264) Allowance for credit losses on loans (89,577) (62,224) (27,353) Total loans held for investment, net $ 7,047,575 $ 7,074,928 $ (27,353) Net deferred tax asset $ 19,317 $ 13,206 $ 6,111 Liabilities: Allowance for credit losses on unfunded loan commitments $ 4,462 $ 3,113 $ 1,349 Equity: Retained earnings $ 738,493 $ 761,083 $ (22,590) The adoption of ASU 2016-13 Accounting Standards Issued But Not Yet Adopted Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans In August 2018, the FASB issued ASU No. 2018-14, Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Changes to the Disclosure Requirements for Defined Benefit Plans. The amendments in this ASU apply to all employers that sponsor defined benefit pension or other postretirement plans. These amendments remove certain disclosures from Topic 715-20 and require additional disclosures. The amendments in this ASU will require S&T to update our employee benefits disclosures beginning with our Form 10-Q for the period ended March 31, 2021. The amendments in this ASU will have no impact on our consolidated financial statements. Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The amendments in this ASU simplifies the accounting for income taxes by removing certain exceptions and improves the consistent application of GAAP by clarifying and amending other existing guidance. The amendments in this ASU will be effective on January 1, 2021 and are not expected to have any impact on our consolidated financial statements. Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The amendments in this ASU provide optional guidance for a limited period of time to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting. The amendments provide optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. Modified contracts that meet certain scope guidance are eligible for relief from the modification accounting requirements in US GAAP. The optional guidance generally allows for the modified contract to be accounted for as a continuation of the existing contract and does not require contract remeasurement at the modification date or reassessment of a previous accounting determination. The amendments in this ASU are effective as of March 12, 2020 through December 31, 2022. We are evaluating the impacts of this ASU and have not yet determined whether LIBOR transition and this ASU will have material effects on our business operations and consolidated financial statements. SEC Release No. 2020-118 - Amendments to Improve Financial Disclosures about Acquisitions and Dispositions of Businesses In May 2020, the Securities and Exchange Commission adopted amendments to the financial disclosure requirements in Regulation S-X for acquisitions and dispositions of businesses, including real estate operations, in Rules 3-05, 3-14, 8-04, 8-05, 8-06, and Article 11, as well as in other related rules and forms. In conjunction with these changes, the Commission also amended the significance tests in the “significant subsidiary” definition in Rule 1-02(w), Securities Act Rule 405, and Exchange Act Rule 12b-2 to improve their application and to assist registrants in making more meaningful determinations of whether a subsidiary or an acquired or disposed business is significant. In addition, to address the unique attributes of investment companies and business development companies, the Commission adopted new requirements regarding fund acquisitions specific to registered investment companies and business development companies. The amendments in this final rule are effective beginning January 1, 2021. We are evaluating the impact of this final rule and we expect these amendments to impact disclosures in our consolidated financial statements relating to any future acquisitions and disposition of businesses.
Fair Value Measurements	We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, loans held for investment, OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets. Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which are developed based on market data that we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances. The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred. The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis. Recurring Basis Available-for-Sale Debt Securities We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing services which provide us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market valuation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models, vast descriptive terms and conditions databases and extensive quality control programs. Equity Securities Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3. Deferred Compensation Plan Assets We use quoted market prices to determine the fair value of our equity security assets. These securities are reported at fair value with the gains and losses included in noninterest income in our Consolidated Statements of Comprehensive (Loss) Income. These assets are held in a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1. Deferred compensation plan assets are reported in other assets in the Consolidated Balance Sheets. Derivative Financial Instruments We use derivative instruments, including interest rate swaps for commercial loans with our customers, interest rate lock commitments and the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties’ nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings. Nonrecurring Basis Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans are transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3. Loans Held for Investment Loans that are individually evaluated to determine whether a specific allocation of ACL is needed are reported at fair value. Fair value is determined using the following methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Loans carried at fair value are classified as Level 3. OREO and Other Repossessed Assets OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3. Mortgage Servicing Rights The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. Since the valuation model includes significant unobservable inputs as listed above, MSRs are classified as Level 3. MSRs are reported in other assets in the Consolidated Balance Sheets and are amortized into mortgage banking income in the Consolidated Statements of Comprehensive (Loss) Income. Other Assets We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above. Financial Instruments In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and a willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments. Cash and Cash Equivalents The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value. Loans The fair value of variable rate loans that may reprice frequently at short-term market rates is based on carrying values adjusted for liquidity and credit risk. The fair value of variable rate loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for liquidity and credit risk. The fair value of fixed rate loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans adjusted for liquidity and credit risk. Bank Owned Life Insurance Fair value approximates net cash surrender value of bank owned life insurance, or BOLI. Federal Home Loan Bank, or FHLB, and Other Restricted Stock It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; it is presented at carrying value. Collateral Receivable The carrying amount included in Other Assets on our Consolidated Balance Sheets approximates fair value. Deposits The fair values disclosed for deposits without defined maturities ( e.g. , noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value. Short-Term Borrowings The carrying amounts of securities sold under repurchase agreements, or REPOs, and other short-term borrowings approximate their fair values. Long-Term Borrowings The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values. Junior Subordinated Debt Securities The interest rate on the variable rate junior subordinated debt securities is reset quarterly; therefore, the carrying values approximate their fair values. Loan Commitments and Standby Letters of Credit Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties. Other Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations.
Allowance for Loans 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) Construction, 2) Commercial Real Estate, or CRE, 3) Commercial and Industrial, or C&I, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. The following are key risks within each portfolio segment: CRE —Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, retail, multifamily, and health care. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied. C&I —Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often does not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt. Commercial Construction —Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer. Business Banking —Commercial loans made to small businesses that are standard, non-complex products evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards that meet small business market customers’ needs. The business banking portfolio is monitored by utilizing a standard and closely managed process focusing on behavioral and performance criteria. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and business. Consumer Real Estate —Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residential mortgages, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt. Other Consumer —Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values. Management monitors various credit quality indicators for the commercial, business banking and consumer loan portfolios, including changes in risk ratings, nonperforming status and delinquency on a monthly basis. We monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard. Our risk ratings are consistent with regulatory guidance and are as follows: Pass —The loan is currently performing and is of high quality. Special Mention —A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Substandard —A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Doubtful —Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions, and values, highly questionable and improbable.
Derivative Financial Instruments	Interest Rate Swaps In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates. Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial. Derivatives contain an element of credit risk, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive (Loss) Income. Interest Rate Lock Commitments and Forward Sale Contracts In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for a period of 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive (Loss) Income.
Revenue From Contracts with Customer	We earn revenue from contracts with our customers when we have completed our performance obligations and recognize that revenue when services are provided to our customers. Our contracts with customers are primarily in the form of account agreements. Generally, our services are transferred at a point in time in response to transactions initiated and controlled by our customers under service agreements with an expected duration of one year or less. Our customers have the right to terminate their service agreements at any time. We do not defer incremental direct costs to obtain contracts with customers that would be amortized in one year or less. These costs are primarily salaries and employee benefits recognized as expense in the period incurred. Service charges on deposit accounts - We recognize monthly service charges for both commercial and personal banking customers based on account fee schedules. Our performance obligation is generally satisfied and the related revenue recognized at a point in time or over time when the services are provided. Other fees are earned based on specific transactions or customer activity within the customers' deposit accounts. These are earned at the time the transaction or customer activity occurs. Debit and credit card services - Interchange fees are earned whenever debit and credit cards are processed through third-party card payment networks. ATM fees are based on transactions by our customers' and other customers' use of our ATMs or other ATMs. Debit and credit card revenue is recognized at a point in time when the transaction is settled. Our performance obligation to our customers is generally satisfied and the related revenue is recognized at a point in time when the service is provided. Third-party service contracts include annual volume and marketing incentives which are recognized over a period of twelve months when we meet thresholds as stated in the service contract. Wealth management services - Wealth management services are primarily comprised of fees earned from the management and administration of trusts, assets under administration and other financial advisory services. Generally, wealth management fees are earned over a period of time between monthly and annually, per the related fee schedules. Our performance obligations with our customers are generally satisfied when we provide the services as stated in the customers' agreements. The fees are based on a fixed amount or a scale based on the level of services provided or amount of assets under management. Other fee revenue - Other fee revenue includes a variety of other traditional banking services such as, electronic banking fees, letters of credit origination fees, wire transfer fees, money orders, treasury checks, checksale fees and transfer fees. Our performance obligations are generally satisfied at a point in time, while fee revenue is recognized when the services are provided or the transaction is settled.

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Schedule of Impact of ASU 2016-13	The following table details the impact of ASU 2016-13 and the reclassification of loans for the identification of new portfolio loan segments under CECL: January 1, 2020 (dollars in thousands) As Reported Under ASU 2016-13 Pre-ASU 2016-13 Impact of ASU 2016-13 Adoption Assets: Loans held for investment (outstanding balance) Commercial real estate $ 2,946,319 $ 3,416,518 $ (470,199) Commercial and industrial 1,458,541 1,720,833 (262,292) Commercial construction 345,263 375,445 (30,182) Business banking 1,092,908 — 1,092,908 Consumer real estate 1,235,352 1,545,323 (309,971) Other consumer 58,769 79,033 (20,264) Allowance for credit losses on loans (89,577) (62,224) (27,353) Total loans held for investment, net $ 7,047,575 $ 7,074,928 $ (27,353) Net deferred tax asset $ 19,317 $ 13,206 $ 6,111 Liabilities: Allowance for credit losses on unfunded loan commitments $ 4,462 $ 3,113 $ 1,349 Equity: Retained earnings $ 738,493 $ 761,083 $ (22,590)

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Summary of Consideration, Assets Acquired and Liabilities Assumed	The following table presents the preliminary fair value adjustments and the measurement period adjustments as of the dates presented: November 30, 2019 June 30, 2020 As Recorded by DNB Preliminary Fair Value Adjustments As Recorded by S&T Measurement Period Adjustments As Recorded by S&T Fair Value of Assets Acquired Cash and cash equivalents $ 64,119 $ — $ 64,119 $ — $ 64,119 Securities and other investments 108,715 183 108,898 — 108,898 Loans 917,127 (8,143) 908,984 (2,377) 906,607 Allowance for credit losses (6,487) 6,487 — — — Goodwill 15,525 (15,525) — — — Premises and equipment 6,782 8,090 14,872 — 14,872 Accrued interest receivable 4,138 — 4,138 — 4,138 Deferred income taxes 2,017 (3,298) (1,281) 311 (970) Core deposits and other intangible assets 269 (269) — — — Other assets 24,883 (4,278) 20,605 74 20,679 Total Assets Acquired 1,137,088 (16,753) 1,120,335 (1,992) 1,118,343 Fair Value of Liabilities Assumed Deposits 966,263 1,002 967,265 — 967,265 Borrowings 37,617 (276) 37,341 (257) 37,084 Accrued interest payable and other liabilities 11,157 (3,184) 7,973 (68) 7,905 Total Liabilities Assumed 1,015,037 (2,458) 1,012,579 (325) 1,012,254 Total Net Assets Acquired $ 122,051 $ (14,295) $ 107,756 $ (1,667) $ 106,089 Core Deposit Intangible Asset $ 7,288 $ — $ 7,288 Wealth Management Intangible Asset 1,772 — 1,772 Total Fair Value of Net Assets Acquired and Identified $ 116,816 $ (1,667) $ 115,149 Consideration Paid Cash $ 360 $ — $ 360 Common stock 200,631 — 200,631 Fair Value of Total Consideration $ 200,991 $ — $ 200,991 Goodwill $ 84,175 $ 1,667 $ 85,842

(Loss) Earnings Per Share (Tabl

(Loss) Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
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 (loss) earnings per share calculations for the periods presented. Three Months Ended June 30, Six Months Ended June 30, (in thousands, except share and per share data) 2020 2019 2020 2019 Numerator for (Loss) Earnings per Share—Basic: Net (loss) income $ (33,072) $ 26,101 $ (19,841) $ 49,029 Less: Income allocated to participating shares — 72 — 137 Net (Loss) Income Allocated to Shareholders $ (33,072) $ 26,029 $ (19,841) $ 48,892 Numerator for (Loss) Earnings per Share—Diluted: Net (loss) income $ (33,072) $ 26,101 $ (19,841) $ 49,029 Net (Loss) Income Available to Shareholders $ (33,072) $ 26,101 $ (19,841) $ 49,029 Denominators for (Loss) Earnings per Share: Weighted Average Shares Outstanding—Basic 39,013,161 34,158,136 39,142,351 34,298,185 Add: Potentially dilutive shares — 52,850 — 88,121 Denominator for Treasury Stock Method—Diluted 39,013,161 34,210,986 39,142,351 34,386,306 Weighted Average Shares Outstanding—Basic 39,013,161 34,158,136 39,142,351 34,298,185 Add: Average participating shares outstanding — 93,433 — 96,261 Denominator for Two-Class Method—Diluted 39,013,161 34,251,569 39,142,351 34,394,446 (Loss) Earnings per share—basic $ (0.85) $ 0.76 $ (0.51) $ 1.43 (Loss) Earnings per share—diluted $ (0.85) $ 0.76 $ (0.51) $ 1.43 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 21,333 5,183 82,624 44,153

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2020
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 June 30, 2020 and December 31, 2019. There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented. June 30, 2020 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ — $ 10,355 $ — $ 10,355 Obligations of U.S. government corporations and agencies — 163,703 — 163,703 Collateralized mortgage obligations of U.S. government corporations and agencies — 181,162 — 181,162 Residential mortgage-backed securities of U.S. government corporations and agencies — 19,768 — 19,768 Commercial mortgage-backed securities of U.S. government corporations and agencies — 284,550 — 284,550 Corporate obligations — 5,038 — 5,038 Obligations of states and political subdivisions — 137,127 — 137,127 Total Available-for-sale Debt Securities — 801,703 — 801,703 Marketable equity securities 2,602 61 — 2,663 Total Securities 2,602 801,764 — 804,366 Securities held in a deferred compensation plan 5,489 — — 5,489 Derivative financial assets: Interest rate swaps — 94,371 — 94,371 Interest rate lock commitments — 2,583 — 2,583 Total Assets $ 8,091 $ 898,718 $ — $ 906,809 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 94,286 $ — $ 94,286 Forward sale contracts — 594 — 594 Total Liabilities $ — $ 94,880 $ — $ 94,880 December 31, 2019 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Available-for-sale debt securities: U.S. Treasury securities $ — $ 10,040 $ — $ 10,040 Obligations of U.S. government corporations and agencies — 157,697 — 157,697 Collateralized mortgage obligations of U.S. government corporations and agencies — 189,348 — 189,348 Residential mortgage-backed securities of U.S. government corporations and agencies — 22,418 — 22,418 Commercial mortgage-backed securities of U.S. government corporations and agencies — 275,870 — 275,870 Corporate Bonds — 7,627 — 7,627 Obligations of states and political subdivisions — 116,133 — 116,133 Total Available-for-Sale Debt Securities — 779,133 — 779,133 Marketable equity securities 5,078 72 — 5,150 Total Securities 5,078 779,205 — 784,283 Securities held in a deferred compensation plan 5,987 — — 5,987 Derivative financial assets: Interest rate swaps — 25,647 — 25,647 Interest rate lock commitments — 321 — 321 Forward sale contracts — 1 — 1 Total Assets $ 11,065 $ 805,174 $ — $ 816,239 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 25,615 $ — $ 25,615 Total Liabilities $ — $25,615 $— $25,615
Schedule of Assets Measured at Fair Value on Nonrecurring Basis by Significant Unobservable Inputs	For Level 3 assets measured at fair value on a nonrecurring basis as of June 30, 2020 and December 31, 2019, the significant unobservable inputs used in the fair value measurements were as follows: June 30, 2020 Valuation Technique Significant Unobservable Inputs Range Weighted Average (1) (2) (3) (dollars in thousands) Loans held for investment $ 61,068 Collateral method Costs to sell 0% - 17% 6.81% Discounted cash flow method Discount rate 3.25% 3.25% Other real estate owned 2,413 Collateral method Costs to sell 0% - 7.00% 4.52% Mortgage servicing rights $ 4,278 Discounted cash flow method Discount rate 9.33% - 12.55% 9.44% Constant prepayment rates 7.59% - 13.58% 12.95% Total Assets $ 67,759
Schedule of Carrying Values and Fair Values of Financial Instruments	The carrying values and fair values of our financial instruments at June 30, 2020 and December 31, 2019 are presented in the following tables: Carrying Value (1) Fair Value Measurements at June 30, 2020 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 351,365 $ 351,365 $ 351,365 $ — $ — Securities 804,366 804,366 2,602 801,764 — Loans held for sale 14,259 14,072 — — 14,072 Portfolio loans, net 7,433,949 7,422,797 — — 7,422,797 Bank owned life insurance 81,443 81,443 — 81,443 — FHLB and other restricted stock 15,151 15,151 — — 15,151 Collateral receivable 91,736 91,736 91,736 — — Securities held in a deferred compensation plan 5,489 5,489 5,489 — — Mortgage servicing rights 4,279 4,279 — — 4,279 Interest rate swaps 94,371 94,371 — 94,371 — Interest rate lock commitments 2,583 2,583 — 2,583 — LIABILITIES Deposits $ 7,867,916 $ 7,874,298 $ 6,344,076 $ 1,530,222 $ — Securities sold under repurchase agreements 92,159 92,159 92,159 — — Short-term borrowings 84,541 84,541 84,541 — — Long-term borrowings 49,489 50,538 4,585 45,953 — Junior subordinated debt securities 64,053 64,053 64,053 — — Interest rate swaps 94,286 94,286 — 94,286 — Forward sales contracts 594 594 — 594 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2019 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 197,823 $ 197,823 $ 197,823 $ — $ — Securities 784,283 784,283 5,078 779,205 — Loans held for sale 5,256 5,256 — — 5,256 Portfolio loans, net 7,074,928 6,940,875 — — 6,940,875 Bank owned life insurance 80,473 80,473 — 80,473 — FHLB and other restricted stock 22,977 22,977 — — 22,977 Securities held in a Deferred Compensation Plan 5,987 5,987 5,987 — — Mortgage servicing rights 4,662 4,650 — — 4,650 Interest rate swaps 25,647 25,647 — 25,647 — Interest rate lock commitments 321 321 — 321 — Forward sale contracts 1 1 — 1 — LIABILITIES Deposits $ 7,036,576 $ 7,034,595 $ 5,441,143 $ 1,593,452 $ — Securities sold under repurchase agreements 19,888 19,888 19,888 — — Short-term borrowings 281,319 281,319 281,319 — — Long-term borrowings 50,868 51,339 4,678 46,661 — Junior subordinated debt securities 64,277 64,277 64,277 — — Interest rate swaps 25,615 25,615 — 25,615 — (1) As reported in the Consolidated Balance Sheets

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2020
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) June 30, 2020 December 31, 2019 Available-for-sale debt securities $ 801,703 $ 779,133 Marketable equity securities 2,663 5,150 Total Securities $ 804,366 $ 784,283
Schedule of Debt Securities, Available-for-Sale	The following tables present the amortized cost and fair value of available-for-sale debt securities as of the dates presented: June 30, 2020 December 31, 2019 (dollars in thousands) Amortized Gross Gross Fair Amortized Gross Gross Fair U.S. Treasury securities $ 9,975 $ 380 $ — $ 10,355 $ 9,969 $ 71 $ — $ 10,040 Obligations of U.S. government corporations and agencies 158,869 4,835 (1) 163,703 155,969 1,773 (45) 157,697 Collateralized mortgage obligations of U.S. government corporations and agencies 172,938 8,224 — 181,162 186,879 2,773 (304) 189,348 Residential mortgage-backed securities of U.S. government corporations and agencies 18,891 877 — 19,768 22,120 321 (23) 22,418 Commercial mortgage-backed securities of U.S. government corporations and agencies 269,673 14,877 — 284,550 273,771 2,680 (581) 275,870 Corporate obligations 5,026 12 — 5,038 7,603 24 — 7,627 Obligations of states and political subdivisions 130,002 7,125 — 137,127 112,116 4,017 — 116,133 Total Available-for-Sale Debt Securities (1) $ 765,374 $ 36,330 $ (1) $ 801,703 $ 768,427 $ 11,659 $ (953) $ 779,133
Schedule of Temporally Impaired 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: June 30, 2020 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies 1 49,990 (1) — — — 1 49,990 (1) Collateralized mortgage obligations of U.S. government corporations and agencies 1 1 — — — — 1 1 — Residential mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Commercial mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Corporate bonds — — — — — — — — — Obligations of states and political subdivisions — — — — — — — — — Total 2 $ 49,991 $ (1) — $ — $ — 2 $ 49,991 $ (1) December 31, 2019 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies 3 22,638 (45) — — — 3 22,638 (45) Collateralized mortgage obligations of U.S. government corporations and agencies 6 23,393 (73) 6 25,254 (231) 12 48,647 (304) Residential mortgage-backed securities of U.S. government corporations and agencies 1 982 (2) 1 2,534 (21) 2 3,516 (23) Commercial mortgage-backed securities of U.S. government corporations and agencies 9 90,005 (581) — — — 9 90,005 (581) Corporate bonds 1 79 — — — — 1 79 — Obligations of states and political subdivisions — — — — — — — — — Total Temporarily Impaired Debt Securities 20 $ 137,097 $ (701) 7 $ 27,788 $ (252) 27 $ 164,885 $ (953)
Schedule of Unrealized Gains and Losses, Net of Tax, of Debt Securities Available-for-Sale	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: June 30, 2020 December 31, 2019 (dollars in thousands) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains/(Losses) Gross Unrealized Gains Gross Unrealized Losses Net Unrealized Gains/(Losses) Total unrealized gains/(losses) on available-for-sale debt securities $ 36,330 $ (1) $ 36,329 $ 11,659 $ (953) $ 10,706 Income tax (expense) benefit (7,736) — (7,736) (2,486) 203 (2,283) Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Income/(Loss) $ 28,594 $ (1) $ 28,593 $ 9,173 $ (750) $ 8,423
Schedule of Contractual Maturity of Debt Securities Available-for-Sale Securities	The amortized cost and fair value of available-for-sale debt securities at June 30, 2020 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. June 30, 2020 (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 $ 106,927 $ 107,417 Due after one year through five years 105,757 111,561 Due after five years through ten years 55,138 58,778 Due after ten years 31,024 33,429 Available-for-Sale Debt Securities With Maturities 298,846 311,185 Collateralized mortgage obligations of U.S. government corporations and agencies 172,938 181,162 Residential mortgage-backed securities of U.S. government corporations and agencies 18,891 19,768 Commercial mortgage-backed securities of U.S. government corporations and agencies 269,673 284,550 Corporate Securities 5,026 5,038 Total Available-for-Sale Debt Securities $ 765,374 $ 801,703
Schedule of Unrealized Gains and Losses on Marketable Equity Securities	The following table presents realized and unrealized net gains and losses for our marketable equity securities for the periods presented: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands) 2020 2019 2020 2019 Marketable Equity Securities Net gains and losses recognized during the period on equity securities $ 448 $ 52 $ (1,137) $ (266) Less: Net gains and losses recognized during the period on equity securities sold during the period 142 — 142 — Unrealized Losses/Gains Recognized During the Reporting Period on Equity Securities Still Held at the Reporting Date $ 306 $ 52 $ (1,279) $ (266)

Loans and Loans Held for Sale (

Loans and Loans Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Schedule of Composition of Loans	The following table presents loans as of the dates presented: (dollars in thousands) June 30, 2020 December 31, 2019 Commercial Commercial real estate $ 3,345,513 $ 3,416,518 Commercial and industrial 2,140,355 1,720,833 Commercial construction 459,264 375,445 Total Commercial Loans 5,945,132 5,512,796 Consumer Residential mortgage 971,023 998,585 Home Equity 539,519 538,348 Installment and other consumer 79,816 79,033 Consumer construction 13,068 8,390 Total Consumer Loans 1,603,426 1,624,356 Total Portfolio Loans 7,548,558 7,137,152 Loans held for sale 14,259 5,256 Total Loans (1) $ 7,562,817 $ 7,142,408
Schedule of Restructured Loans for Periods Presented	The following tables summarize restructured loans as of the dates presented: June 30, 2020 (dollars in thousands) Performing Nonperforming Total Commercial real estate $ 25 $ 27,100 $ 27,125 Commercial and industrial 4,388 2,068 6,456 Commercial construction 3,997 — 3,997 Business banking 1,488 349 1,837 Consumer real estate 5,635 2,238 7,873 Other consumer 3 — 3 Total (1) $ 15,536 $ 31,755 $ 47,291 (1) Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. December 31, 2019 (dollars in thousands) Performing Nonperforming Total Commercial real estate $ 22,233 $ 6,713 $ 28,946 Commercial and industrial 6,909 695 7,604 Commercial construction 1,425 — 1,425 Residential mortgage 2,013 822 2,835 Home equity 4,371 678 5,049 Installment and other consumer 9 4 13 Total $ 36,960 $ 8,912 $ 45,872 Three Months Ended June 30, 2020 Six Months Ended June 30, 2020 (dollars in thousands) Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Totals by Loan Segment Commercial Real Estate Principal deferral and maturity date extension — — — — 1 2,210 2,210 — Total Commercial Real Estate — — — — 1 2,210 2,210 — Commercial and Industrial Maturity date extension and interest rate reduction 1 75 75 — 1 75 75 — Principal deferral and maturity date extension — — — — 1 2,467 2,068 (399) Payment deferral resulting in payment delay 1 93 27 — (66) 1 93 27 (66) Total Commercial and Industrial 2 168 102 (66) 3 2,635 2,170 (465) Commercial Construction Maturity date extension 2 701 701 — 3 2,592 2,572 (20) Total Commercial Construction 2 701 701 — 3 2,592 2,572 (20) Residential Mortgage Consumer bankruptcy (2) 1 160 160 — 1 160 160 — Maturity date extension and payment reduction 2 150 150 — 3 177 177 — Total Residential Mortgage 3 310 310 — 4 337 337 — Home Equity Consumer bankruptcy (2) 4 191 191 — 9 567 564 (3) Total Home Equity 4 191 191 — 9 567 564 (3) Totals by Concession Type Principal deferral and maturity date extension — — — — 2 4,677 4,278 (399) Maturity date extension and interest rate reduction 1 75 75 — 1 75 75 — Payment deferral resulting in payment delay 1 93 27 (66) 1 93 27 (66) Maturity date extension 2 701 701 — 3 2,592 2,572 (20) Consumer bankruptcy (2) 5 351 351 — 10 727 724 (3) Maturity date extension and payment reduction 2 150 150 — 3 177 177 — Total (3) 11 $ 1,370 $ 1,304 $ (66) 20 $ 8,341 $ 7,853 $ (488) (1) 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. (2) Consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (3) Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The following tables present the restructured loans by portfolio segment and by type of concession for the three and six months ended June 30, 2019: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 (dollars in thousands) Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Number of Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference Totals by Loan Segment Commercial Real Estate Maturity date extension 1 1,322 1,311 (11) 1 1,322 1,311 (11) Maturity date extension and interest rate reduction 1 151 148 (3) 1 151 148 (3) Principal forgiveness 1 4,690 4,631 (59) 1 4,690 4,631 (59) Total Commercial Real Estate 3 6,163 6,090 (73) 3 6,163 6,090 (73) Commercial and Industrial Maturity date extension and interest rate reduction — — — — 1 4,751 4,529 (222) Total Commercial and Industrial — — — — 1 4,751 4,529 (222) Commercial Construction Total Commercial Construction — — — — — — — — Residential Mortgage Consumer bankruptcy (2) 2 116 115 (1) 3 166 163 (3) Total Residential Mortgage 2 116 115 (1) 3 166 163 (3) Home Equity Consumer bankruptcy (2) 6 107 105 (2) 13 298 268 (30) Interest rate reduction 1 109 108 (1) 2 190 189 (1) Total Home Equity 7 216 213 (3) 15 488 457 (31) Installment and Other Consumer Consumer bankruptcy (2) 2 9 9 — 3 9 9 — Total Installment and Other Consumer $ 2 $ 9 $ 9 $ — $ 3 $ 9 $ 9 $ — Totals by Concession Type Maturity date extension 1 1,322 1,311 (11) 1 1,322 1,311 (11) Maturity date extension and interest rate reduction 1 151 148 (3) 2 4,902 4,677 (225) Principal forgiveness 1 4,690 4,631 (59) 1 4,690 4,631 (59) Consumer bankruptcy (2) 10 232 229 (3) 19 473 440 (33) Interest rate reduction 1 109 108 (1) 2 190 189 (1) Total (3) 14 $ 6,504 $ 6,427 $ (77) 25 $ 11,577 $ 11,248 $ (329) (1) 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. (2) Consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed. (3) Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.
Schedule of Summary of Nonperforming Assets	The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) June 30, 2020 December 31, 2019 Nonperforming Assets Nonaccrual loans $ 58,358 $ 45,145 Nonaccrual TDRs 31,755 8,912 Total Nonaccrual Loans 90,113 54,057 OREO 2,740 3,525 Total Nonperforming Assets $ 92,853 $ 57,582 The following table presents loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: June 30, 2020 June 30, 2020 For the three months ended For the six months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Past Due 90+ Days Still Accruing Interest Income Recognized on Nonaccrual (1) Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 25,356 $ 55,776 $14,889 $ — $3 $12 Commercial and industrial 10,911 2,626 — 1,506 9 23 Commercial construction 737 1,504 1,218 — — — Business banking 9,863 16,475 3,002 — 57 104 Consumer real estate 6,063 11,873 398 572 75 170 Other consumer 1,127 1,859 — 122 1 3 Total $ 54,057 $ 90,113 $19,507 $ 2,200 $145 $312 (1) Represents only cash payments received and applied to interest on nonaccrual loans.

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Schedule of Loans Credit Quality Indicators	The following table presents loan balances by year of origination and internally assigned risk rating for our portfolio segments as of June 30, 2020: Risk Rating (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Pass $ 231,670 $ 468,786 $ 443,243 $ 327,871 $ 401,126 $ 769,224 $ 48,527 — $ 2,690,447 Special Mention — 8,741 187 13,182 8,172 50,717 2,350 — 83,349 Substandard — — 938 9,098 22,059 49,912 2,890 — 84,897 Doubtful — — — — 471 2,859 80 — 3,410 Total Commercial Real Estate 231,670 477,527 444,368 350,151 431,828 872,712 53,847 — 2,862,103 Commercial and Industrial Pass 350,890 224,067 162,559 88,479 56,286 301,155 383,176 44 1,566,656 Special Mention 39 14,104 3,722 917 6,977 10,302 42,199 — 78,260 Substandard 75 5,417 2,799 14,979 75 11,354 3,061 — 37,760 Doubtful — — — — — — — — — Total Commercial and Industrial 351,004 243,588 169,080 104,375 63,338 322,811 428,436 44 1,682,676 Commercial Construction Pass 67,685 206,187 107,927 17,499 17,335 10,533 11,844 — 439,010 Special Mention — — 3,581 — — 5,076 91 — 8,748 Substandard — — — 1,742 — 3,598 — — 5,340 Doubtful — — — — — — — — — Total Commercial Construction 67,685 206,187 111,508 19,241 17,335 19,207 11,935 — 453,098 Business Banking Pass 289,837 171,903 142,912 99,586 88,874 310,932 110,498 1,247 1,215,789 Special Mention — 100 1,341 1,742 1,144 7,071 733 69 12,200 Substandard — 627 3,115 4,616 4,036 27,566 680 206 40,846 Doubtful — — — — — — — — — Total Business Banking 289,837 172,630 147,368 105,944 94,054 345,569 111,911 1,522 1,268,835 Consumer Real Estate Pass 59,273 143,091 81,972 79,203 87,809 309,636 421,987 7,123 1,190,094 Special Mention — — — — 798 300 — — 1,098 Substandard — 188 299 812 973 8,447 202 — 10,921 Doubtful — — — — — — — — — Total Consumer Real Estate 59,273 143,279 82,271 80,015 89,580 318,383 422,189 7,123 1,202,113 Other consumer Pass 4,720 16,987 9,223 5,323 4,256 1,561 30,377 268 72,715 Special Mention — — — — — — — — — Substandard — 559 145 117 691 4,839 408 259 7,018 Doubtful — — — — — — — — — Total Other Consumer 4,720 17,546 9,368 5,440 4,947 6,400 30,785 527 79,733 Total Loan Balance $ 1,004,189 $ 1,260,757 $ 963,963 $ 665,166 $ 701,082 $ 1,885,082 $ 1,059,103 $ 9,216 $ 7,548,558 The following table presents loan balances by year of origination and performing and nonperforming status for our portfolio segments as of June 30, 2020: (dollars in thousands) 2020 2019 2018 2017 2016 2015 and Prior Revolving Revolving-Term Total Commercial Real Estate Performing $ 231,670 $ 477,527 $ 444,368 $ 350,151 $ 411,792 $ 839,942 $ 50,877 $ — $ 2,806,327 Nonperforming — — — — 20,036 32,770 2,970 — 55,776 Total Commercial Real Estate 231,670 477,527 444,368 350,151 431,828 872,712 53,847 — 2,862,103 Commercial and Industrial Performing 351,004 243,588 168,814 104,375 63,338 322,811 426,076 44 1,680,050 Nonperforming — — 266 — — — 2,360 — 2,626 Total Commercial and Industrial 351,004 243,588 169,080 104,375 63,338 322,811 428,436 44 1,682,676 Commercial Construction Performing 67,685 206,187 111,508 18,200 17,335 18,744 11,935 — 451,594 Nonperforming — — — 1,041 — 463 — — 1,504 Total Commercial Construction 67,685 206,187 111,508 19,241 17,335 19,207 11,935 — 453,098 Business Banking Performing 289,837 172,290 145,563 104,549 92,708 334,316 111,696 1,401 1,252,360 Nonperforming — 340 1,805 1,395 1,346 11,253 215 121 16,475 Total Business Banking 289,837 172,630 147,368 105,944 94,054 345,569 111,911 1,522 1,268,835 Consumer Real Estate Performing 59,273 143,174 81,327 78,888 88,576 309,984 421,895 7,123 1,190,240 Nonperforming — 105 944 1,127 1,004 8,399 294 — 11,873 Total Consumer Real Estate 59,273 143,279 82,271 80,015 89,580 318,383 422,189 7,123 1,202,113 Other Consumer Performing 4,720 17,069 9,368 5,338 4,664 5,630 30,594 491 77,874 Nonperforming — 477 — 102 283 770 191 36 1,859 Total Other Consumer 4,720 17,546 9,368 5,440 4,947 6,400 30,785 527 79,733 Performing 1,004,189 1,259,835 960,948 661,501 678,413 1,831,427 1,053,073 9,059 7,458,445 Nonperforming — 922 3,015 3,665 22,668 53,655 6,030 157 90,113 Total Loan Balance $ 1,004,189 $ 1,260,757 $ 963,963 $ 665,166 $ 701,082 $ 1,885,082 $ 1,059,103 $ 9,216 $ 7,548,558 The following table presents collateral-dependent loans by class of loan: June 30, 2020 Type of Collateral (dollars in thousands) Real Estate Blanket Lien Investment/Cash Other Commercial real estate $55,447 $40 $— $— Commercial and industrial 2,762 3,694 — — Commercial construction 5,215 — — — Business banking 2,906 896 — 689 Consumer real estate 398 — — — Total $66,728 $4,630 $— $689 The following table presents the recorded investment in commercial loan classes by internally assigned risk ratings as of December 31, 2019: December 31, 2019 (dollars in thousands) Commercial % of Commercial % of Commercial % of Total % of Pass $ 3,270,437 95.7 % $ 1,636,314 93.4 % $ 347,324 92.5 % $ 5,254,076 95.3 % Special mention 57,285 1.7 % 36,484 1.7 % 10,109 2.7 % 103,878 1.9 % Substandard 86,772 2.5 % 47,980 4.9 % 17,899 4.8 % 152,651 2.8 % Doubtful 2,023 — % 55 — % 133 — % 2,191 — % Total $ 3,416,518 100.0 % $ 1,720,833 100.0 % $ 375,445 100.0 % $ 5,512,796 100.0 %
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: June 30, 2020 (2) (dollars in thousands) Current 30-59 Days 60-89 Days 90 Days Past Due (1) Non - performing Total Past Total Loans Commercial real estate $ 2,806,327 $ — $ — $ — $ 55,776 $ 55,776 $ 2,862,103 Commercial and industrial 1,678,314 — 230 1,506 2,626 4,362 1,682,676 Commercial construction 451,594 — — — 1,504 1,504 453,098 Business banking 1,248,611 839 2,910 — 16,475 20,224 1,268,835 Consumer real estate 1,184,530 1,429 3,709 572 11,873 17,583 1,202,113 Other consumer 77,420 201 131 122 1,859 2,313 79,733 Total $ 7,446,796 $ 2,469 $ 6,980 $ 2,200 $ 90,113 $ 101,762 $ 7,548,558 (1) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at June 30, 2020. (2) We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans. December 31, 2019 (dollars in thousands) Current 30-59 Days 60-89 Days 90 Days Past Due (1) Non - performing Total Past Total Loans Commercial real estate $ 3,025,505 $ 7,749 $ 71 $ 911 $ 25,356 $ 34,087 $ 3,059,592 Commercial and industrial 1,466,460 126 1,589 1,443 10,911 14,069 1,480,529 Commercial construction 367,204 956 1,163 — 737 2,856 370,060 Business banking 830,735 5,093 1,099 — 9,863 16,055 846,790 Consumer real estate 1,283,591 2,620 1,758 1,175 6,063 11,616 1,295,207 Other consumer 81,866 1,448 305 228 1,127 3,108 84,974 Total $ 7,055,361 $ 17,992 $ 5,985 $ 3,757 $ 54,057 $ 81,791 $ 7,137,152 (1) Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at December 31, 2019.
Schedule of Loans on Nonaccrual Status and Loans Past Due 90 days Or More	The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) June 30, 2020 December 31, 2019 Nonperforming Assets Nonaccrual loans $ 58,358 $ 45,145 Nonaccrual TDRs 31,755 8,912 Total Nonaccrual Loans 90,113 54,057 OREO 2,740 3,525 Total Nonperforming Assets $ 92,853 $ 57,582 The following table presents loans on nonaccrual status and loans past due 90 days or more and still accruing by class of loan: June 30, 2020 June 30, 2020 For the three months ended For the six months ended (dollars in thousands) Beginning of Period Nonaccrual End of Period Nonaccrual Nonaccrual With No Related Allowance Past Due 90+ Days Still Accruing Interest Income Recognized on Nonaccrual (1) Interest Income Recognized on Nonaccrual (1) Commercial real estate $ 25,356 $ 55,776 $14,889 $ — $3 $12 Commercial and industrial 10,911 2,626 — 1,506 9 23 Commercial construction 737 1,504 1,218 — — — Business banking 9,863 16,475 3,002 — 57 104 Consumer real estate 6,063 11,873 398 572 75 170 Other consumer 1,127 1,859 — 122 1 3 Total $ 54,057 $ 90,113 $19,507 $ 2,200 $145 $312 (1) Represents only cash payments received and applied to interest on nonaccrual loans.
Schedule of Allowance for Credit Loss	The following table presents activity in the ACL for the three and six months ended June 30, 2020: Three Months Ended June 30, 2020 (dollars in thousands) Commercial Commercial and Commercial Business Banking Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 42,611 $ 19,870 $ 6,606 $ 13,706 $ 11,200 $ 2,857 $ 96,850 Provision for credit losses on loans 20,681 60,906 2,249 918 400 677 85,831 Charge-offs (5,600) (61,616) — (260) (37) (790) (68,303) Recoveries 38 4 19 40 22 108 231 Net (Charge-offs)/Recoveries (5,562) (61,612) 19 (220) (15) (682) (68,072) Balance at End of Period $ 57,730 $ 19,164 $ 8,874 $ 14,404 $ 11,585 $ 2,852 $ 114,609 Six Months Ended June 30, 2020 (dollars in thousands) Commercial Commercial and Commercial Business Banking (1) Consumer Other Total Allowance for credit losses on loans: Balance at beginning of period $ 30,577 $ 15,681 $ 7,900 $ — $ 6,337 $ 1,729 $ 62,224 Impact of CECL adoption 4,810 7,853 (3,376) 12,898 4,525 642 27,352 Provision for credit losses on loans 28,345 67,104 4,329 2,126 829 1,529 104,262 Charge-offs (6,042) (71,496) — (721) (218) (1,272) (79,749) Recoveries 40 22 21 101 112 224 520 Net (Charge-offs)/Recoveries (6,002) (71,474) 21 (620) (106) (1,048) (79,229) Balance at End of Period $ 57,730 $ 19,164 $ 8,874 $ 14,404 $ 11,585 $ 2,852 $ 114,609
Schedule of Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status	The following table presents the recorded investment in consumer loan classes by performing and nonperforming status as of December 31, 2019: December 31, 2019 (dollars in thousands) Residential % of Home % of Installment % of Consumer % of Total % of Performing $ 991,066 99.2 % $ 535,709 99.5 % $ 78,993 99.9 % $ 8,390 100.0 % $ 1,614,158 99.4 % Nonperforming 7,519 0.8 % 2,639 0.5 % 40 0.1 % — — % 10,198 0.6 % Total $ 998,585 100.0 % $ 538,348 100.0 % $ 79,033 100.0 % $ 8,390 100.0 % $ 1,624,356 100.0 %
Schedule of Investments in Loans Considered to be Impaired and Related Information on Impaired Loans	The following table presents investments in loans considered to be impaired and related information on those impaired loans as of December 31, 2019: December 31, 2019 (dollars in thousands) Recorded Unpaid Related With a related allowance recorded: Commercial real estate $ 13,011 $ 14,322 $ 2,023 Commercial and industrial 10,001 10,001 55 Commercial construction 489 489 113 Consumer real estate — — — Other consumer 9 9 9 Total with a Related Allowance Recorded 23,510 24,821 2,200 Without a related allowance recorded: Commercial real estate 34,909 40,201 — Commercial and industrial 7,605 10,358 — Commercial construction 1,425 2,935 — Consumer real estate 7,884 8,445 — Other consumer 4 11 — Total without a Related Allowance Recorded 51,827 61,950 — Total: Commercial real estate 47,920 54,523 2,023 Commercial and industrial 17,606 20,359 55 Commercial construction 1,914 3,424 113 Consumer real estate 7,884 8,445 — Other consumer 13 20 9 Total $ 75,337 $ 86,771 $ 2,200 The following table presents average recorded investment and interest income recognized on impaired loans for the three and six months ended June 30, 2019: Three months ended Six months ended June 30, 2019 June 30, 2019 (dollars in thousands) Average Interest Average Interest With a related allowance recorded: Commercial real estate $ 7,703 $ — $ 7,704 $ — Commercial and industrial 758 13 772 26 Commercial construction 489 — 489 — Consumer real estate 666 — 666 — Other consumer 16 — 18 1 Total with a Related Allowance Recorded 9,632 13 9,649 27 Without a related allowance recorded: Commercial real estate 21,802 77 22,093 124 Commercial and industrial 7,568 131 5,329 189 Commercial construction 2,319 48 2,319 83 Consumer real estate 7,952 93 7,979 188 Other consumer 3 — 4 — Total without a Related Allowance Recorded 39,644 349 37,724 584 Total: Commercial real estate 29,505 77 29,797 124 Commercial and industrial 8,326 144 6,101 215 Commercial construction 2,808 48 2,808 83 Consumer real estate 8,618 93 8,645 188 Other consumer 19 — 22 1 Total $ 49,276 $ 362 $ 47,373 $ 611
Schedule of Summary of Allowance for Loan Losses	The following table details activity in the allowance for loan losses for the three and six months ended June 30, 2019: Three Months Ended June 30, 2019 (dollars in thousands) Commercial Commercial and Commercial Consumer Other Total Balance at beginning of period $ 34,903 $ 11,996 $ 6,757 $ 6,178 $ 1,575 $ 61,409 Charge-offs (528) (1,435) — (247) (457) (2,667) Recoveries 6 91 2 344 89 532 Net (Charge-offs)/Recoveries (522) (1,344) 2 97 (368) (2,135) Provision for credit losses (1,545) 2,575 495 296 384 2,205 Balance at End of Period $ 32,836 $ 13,227 $ 7,254 $ 6,571 $ 1,591 $ 61,479 Six Months Ended June 30, 2019 (dollars in thousands) Commercial Commercial and Commercial Consumer Other Total Balance at beginning of period $ 33,707 $ 11,596 $ 7,983 $ 6,187 $ 1,523 $ 60,996 Charge-offs (529) (6,912) — (410) (840) (8,691) Recoveries 128 508 3 492 189 1,320 Net (Charge-offs)/Recoveries (401) (6,404) 3 82 (651) (7,371) Provision for credit losses (470) 8,035 (732) 302 719 7,854 Balance at End of Period $ 32,836 $ 13,227 $ 7,254 $ 6,571 $ 1,591 $ 61,479
Schedule of Summary of Allowance for Loan Losses and Recorded Investments	The following tables present the allowance for loan losses and recorded investments in loans by category as of December 31, 2019: December 31, 2019 Allowance for Loan Losses Portfolio Loans (dollars in thousands) Individually Collectively Total Individually Collectively Total Commercial real estate $ 2,023 $ 28,554 $ 30,577 $ 47,920 $ 3,368,598 $ 3,416,518 Commercial and industrial 55 15,626 15,681 17,606 1,703,227 1,720,833 Commercial construction 113 7,787 7,900 1,914 373,531 375,445 Consumer real estate — 6,337 6,337 7,884 1,537,439 1,545,323 Other consumer 9 1,720 1,729 13 79,020 79,033 Total $ 2,200 $ 60,024 $ 62,224 $ 75,337 $ 7,061,815 $ 7,137,152

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Value of Derivative Assets and Derivative Liabilities	The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented: Derivatives Derivatives (dollars in thousands) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts - Commercial Loans Fair value $ 94,371 $ 25,647 $ 94,286 $ 25,615 Notional amount 930,074 740,762 930,074 740,762 Collateral posted — — 91,730 26,127 Interest Rate Lock Commitments - Mortgage Loans Fair value 2,583 321 — — Notional amount 59,677 9,829 — — Forward Sale Contracts - Mortgage Loans Fair value — 1 594 — Notional amount $ — $ 12,750 $ 62,617 $ —
Schedule of Offsetting Derivative Assets	The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented: Derivatives Derivatives (dollars in thousands) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 98,649 $ 26,146 $ 98,564 $ 26,114 Gross amounts offset (4,278) (499) (4,278) (499) Net Amounts Presented in the Consolidated Balance Sheets 94,371 25,647 94,286 25,615 Gross amounts not offset (1) — — (91,730) (26,127) Net Amount $ 94,371 $ 25,647 $ 2,556 $ (512) (1) Amounts represent collateral posted for the periods presented.
Schedule of Offsetting Derivative Liabilities	The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented: Derivatives Derivatives (dollars in thousands) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 98,649 $ 26,146 $ 98,564 $ 26,114 Gross amounts offset (4,278) (499) (4,278) (499) Net Amounts Presented in the Consolidated Balance Sheets 94,371 25,647 94,286 25,615 Gross amounts not offset (1) — — (91,730) (26,127) Net Amount $ 94,371 $ 25,647 $ 2,556 $ (512) (1) Amounts represent collateral posted for the periods presented.
Schedule of Amount of Gain or Loss Recognized in Income on Derivatives	The following table indicates the gain or loss recognized in income on derivatives for the periods presented: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands) 2020 2019 2020 2019 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ (62) $ 26 $ 52 $ (96) Interest rate lock commitments—mortgage loans 186 310 2,792 398 Forward sale contracts—mortgage loans 698 (193) (595) (160) Total Derivatives Gain/(Loss) $ 822 $ 143 $ 2,249 $ 142

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Information Pertaining to Borrowings	Information pertaining to borrowings is summarized in the table below as of the dates presented: June 30, 2020 December 31, 2019 (dollars in thousands) Balance Weighted Balance Weighted Short-term Borrowings Securities sold under repurchase agreements $ 92,159 0.25 % $ 19,888 0.74 % Short-term borrowings 84,541 0.38 % 281,319 1.84 % Total Short-term Borrowings 176,700 0.31 % 301,207 1.76 % Long-term Borrowings Long-term borrowings 49,489 2.48 % 50,868 2.60 % Junior subordinated debt securities 64,053 3.31 % 64,277 3.59 % Total Long-term Borrowings 113,542 2.95 % 115,145 3.15 % Total Borrowings $ 290,242 1.34 % $ 416,352 2.14 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2020
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) June 30, 2020 December 31, 2019 Commitments to extend credit $ 2,227,102 $ 1,910,805 Standby letters of credit 82,906 80,040 Total $ 2,310,008 $ 1,990,845
Unfunded Loan Commitments, Allowance For Credit Loss	The activity in the allowance for credit losses on unfunded loan commitments for the three and six months ended June 30, 2020 was as follows: (dollars in thousands) Three Months Ended Balance at March 31, 2020 $ 6,077 Provision for credit losses 927 Total $ 7,004 (dollars in thousands) Six Months Ended Balance at December 31, 2019 $ 3,112 Impact of adopting ASU 2016-13 1,349 January 1, 2020 4,461 Provision for credit losses 2,543 Total $ 7,004

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The information presented in the following table presents the point of revenue recognition for revenue from contracts with customers. Other revenue streams such as: interest income, net securities gains and losses, insurance, mortgage banking and other revenues that are accounted for under other generally accepted accounting principles are excluded. (dollars in thousands) Three Months Ended June 30, Six Months Ended June 30, Revenue Streams Point of Revenue Recognition 2020 2019 2020 2019 Service charges on deposit accounts Over a period of time $ 440 $ 451 $ 924 $ 908 At a point in time 1,902 2,761 4,976 5,457 $ 2,342 $ 3,212 $ 5,900 $ 6,365 Debit and credit card Over a period of time $ 184 $ 177 $ 378 $ 362 At a point in time 3,428 3,324 6,715 6,114 $ 3,612 $ 3,501 $ 7,093 $ 6,476 Wealth management Over a period of time $ 652 $ 409 $ 997 $ 822 At a point in time 1,934 1,653 3,952 3,287 $ 2,586 $ 2,062 $ 4,949 $ 4,109 Other fee revenue At a point in time $ 874 $ 1,145 $ 1,793 $ 2,064

Other Comprehensive Income_(L_2

Other Comprehensive Income/(Loss) (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Schedule of Tax Effects of Components of Other Comprehensive Loss	The following table presents the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 (dollars in thousands) Pre-Tax Tax Net of Tax Pre-Tax Tax Benefit (Expense) Net of Tax Change in net unrealized gains/(losses) on debt securities available-for-sale $ 4,201 $ (894) $ 3,307 $ 8,968 $ (1,912) $ 7,056 Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1) (142) 30 (112) — — — Adjustment to funded status of employee benefit plans 464 (99) 365 452 (96) 356 Other Comprehensive Income (Loss) $ 4,523 $ (963) $ 3,560 $ 9,420 $ (2,008) $ 7,412 Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 (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 $ 25,765 $ (5,482) $ 20,283 $ 16,366 $ (3,490) $ 12,876 Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income (1) (142) 30 (112) — — — Adjustment to funded status of employee benefit plans 929 (198) 731 905 (193) 712 Other Comprehensive Income/(Loss) $ 26,552 $ (5,650) $ 20,902 $ 17,271 $ (3,683) $ 13,588 (1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive (Loss) Income as follows: the pre-tax amount is included in net gain on sale of securities, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

Employee Benefits (Tables)

Employee Benefits (Tables)	6 Months Ended
	Jun. 30, 2020
Retirement Benefits [Abstract]
Schedule of Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit	The following table summarizes the components of net periodic pension cost for the periods presented: Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands) 2020 2019 2020 2019 Components of Net Periodic Pension Cost Interest cost on projected benefit obligation $ 890 $ 989 $ 1,781 $ 1,978 Expected return on plan assets (971) (1,181) (1,943) (2,361) Net amortization 385 395 769 789 Net Periodic Pension Expense $ 304 $ 203 $ 607 $ 406

Basis of Presentation - Schedul

Basis of Presentation - Schedule of Impact of ASU 2016-13 (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020		Dec. 31, 2019		Dec. 31, 2018	Mar. 31, 2020	Jan. 01, 2020	Jun. 30, 2019	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance	$ 7,548,558	[1]	$ 7,137,152
Allowance for credit losses on loans	(114,609)		(62,224)		$ (60,996)	$ (96,850)	$ (62,224)	$ (61,479)	$ (61,409)
Total loans							7,074,928
Net deferred tax asset							13,206
Allowance for credit losses on unfunded loan commitments	7,004		3,112			6,077	3,113
Retained earnings	$ 692,240		$ 761,083				761,083
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member		us-gaap:AccountingStandardsUpdate201613Member		us-gaap:AccountingStandardsUpdate201602Member
As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans							(89,577)
Total loans							7,047,575
Net deferred tax asset							19,317
Allowance for credit losses on unfunded loan commitments			$ 4,461				4,462
Retained earnings							738,493
Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans			(27,352)				(27,353)
Total loans							(27,353)
Net deferred tax asset							6,111
Allowance for credit losses on unfunded loan commitments			1,349				1,349
Retained earnings							(22,590)
Commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans					$ (33,707)			(32,836)	(34,903)
Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans					(11,596)			(13,227)	(11,996)
Commercial and industrial | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans							(9,900)
Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans					(7,983)			(7,254)	(6,757)
Consumer real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans					(6,187)			(6,571)	(6,178)
Other consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans					$ (1,523)			$ (1,591)	$ (1,575)
Commercial | Commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance	$ 2,862,103	[1]	3,059,592				3,416,518
Allowance for credit losses on loans	(57,730)		(30,577)			(42,611)
Commercial | Commercial real estate | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							2,946,319
Commercial | Commercial real estate | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							(470,199)
Allowance for credit losses on loans			(4,810)
Commercial | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance	1,682,676	[1]	1,480,529				1,720,833
Allowance for credit losses on loans	(19,164)		(15,681)			(19,870)
Commercial | Commercial and industrial | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							1,458,541
Commercial | Commercial and industrial | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							(262,292)
Allowance for credit losses on loans			(7,853)
Commercial | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance	453,098	[1]	370,060				375,445
Allowance for credit losses on loans	(8,874)		(7,900)			(6,606)
Commercial | Commercial construction | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							345,263
Commercial | Commercial construction | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							(30,182)
Allowance for credit losses on loans			3,376
Commercial | Business banking
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance	1,268,835	[1]	846,790				0
Allowance for credit losses on loans	(14,404)	[2]	0	[2]		(13,706)
Commercial | Business banking | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							1,092,908
Commercial | Business banking | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							1,092,908
Allowance for credit losses on loans			(12,898)
Consumer | Consumer real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance	1,202,113	[1]	1,295,207				1,545,323
Allowance for credit losses on loans	(11,585)		(6,337)			(11,200)
Consumer | Consumer real estate | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							1,235,352
Consumer | Consumer real estate | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							(309,971)
Allowance for credit losses on loans			(4,525)
Consumer | Other consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance	79,733	[1]	84,974				79,033
Allowance for credit losses on loans	$ (2,852)		(1,729)			$ (2,857)
Consumer | Other consumer | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							58,769
Consumer | Other consumer | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance							$ (20,264)
Allowance for credit losses on loans			$ (642)
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.
[2]	In connection with our adoption of ASU 2016-13, we made changes to our loan portfolio segments to align with the methodology applied in determining the allowance under CECL. Our new segmentation breaks out business banking loans from our other loan segments: CRE, C&I, commercial construction, consumer real estate and other consumer. The business banking allowance balance at the beginning of period is included in the other segments and reclassified to business banking through the impact of CECL adoption line.

Basis of Presentation - Narrati

Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Jan. 01, 2020	Jun. 30, 2019	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Adjustment to allowance for credit loss	$ 114,609	$ 62,224	$ 60,996	$ 96,850	$ 62,224	$ 61,479	$ 61,409
Retained earnings	(1,135,777)	(1,191,998)	(935,761)	(1,176,251)		(964,953)	(943,156)
Threshold for evaluation for expected credit loss of commercial loans	500
Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss			11,596			13,227	11,996
Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss		27,352			27,353
Retained earnings		22,590	(167)
Impact of ASU 2016-13 Adoption | DNB
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss					9,300
Impact of ASU 2016-13 Adoption | S&T Legacy Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss					8,200
Impact of ASU 2016-13 Adoption | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to allowance for credit loss					9,900
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ (692,240)	(761,083)	(701,819)	$ (740,726)		$ (730,577)	$ (716,078)
Retained Earnings | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 22,590	$ (167)		$ 22,600

Business Combinations - Additio

Business Combinations - Additional Information (Details)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)	Nov. 30, 2019USD ($)banking_location$ / sharesshares	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Business Acquisition [Line Items]
Goodwill	$ 373,289,000	$ 371,621,000		$ 373,289,000		$ 373,289,000		$ 373,289,000	$ 371,621,000
Adjustments, Loans	10,500,000	$ 12,300,000
Merger related expenses				0	$ 618,000	2,342,000	$ 618,000
Professional services and legal				1,932,000	$ 1,145,000	2,980,000	$ 2,329,000
DNB
Business Acquisition [Line Items]
Number of banking locations | banking_location			14
Shares of S&T offered for each share of DNB (shares) | shares			1.22
Fair value of total consideration			$ 200,991,000
Cash			$ 360,000
S&T common shares issued (shares) | shares			5,318,964
S&T common shares issued, fair value (in dollars per share) | $ / shares			$ 37.72
Goodwill	85,842,000		$ 84,175,000	85,842,000		85,842,000		85,842,000
Preliminary estimates adjustments								1,667,000
Adjustments, Loans			8,143,000			(2,500,000)		2,377,000
Adjustments, Borrowings			276,000					257,000
Adjustments, Deferred income taxes			(3,298,000)					311,000
Carryover of allowance for credit losses	0		0	0		0		0
Fair value of loans acquired	906,607,000		908,984,000	906,607,000		906,607,000		906,607,000
Discount on loans acquired			$ 10,500,000
Direct costs related to merger	$ 13,700,000			$ 13,700,000		13,700,000		$ 13,700,000
Merger related expenses						2,300,000			11,400,000
Professional services and legal						200,000			2,800,000
Severance payments						1,400,000			3,400,000
Data processing, contract termination, and conversion cost expenses						400,000			4,700,000
Other expenses						$ 300,000			$ 500,000

Business Combinations - Conside

Business Combinations - Consideration, Assets Acquired and Liabilities Assumed (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Nov. 30, 2019	Jun. 30, 2020	Jun. 30, 2020
Fair Value of Assets Acquired
Adjustments, Loans	$ (10,500,000)	$ (12,300,000)
Goodwill	373,289,000	371,621,000		$ 373,289,000	$ 373,289,000
Fair Value of Liabilities Assumed
Goodwill	373,289,000	$ 371,621,000		373,289,000	373,289,000
As Recorded by DNB
Fair Value of Assets Acquired
Cash and cash equivalents			$ 64,119,000
Securities and other investments			108,715,000
Loans			917,127,000
Allowance for credit losses			(6,487,000)
Goodwill			15,525,000
Premises and equipment			6,782,000
Accrued interest receivable			4,138,000
Deferred income taxes			2,017,000
Core deposits and other intangible assets			269,000
Other assets			24,883,000
Total Assets Acquired			1,137,088,000
Fair Value of Liabilities Assumed
Deposits			966,263,000
Borrowings			37,617,000
Accrued interest payable and other liabilities			11,157,000
Total Liabilities Assumed			1,015,037,000
Total Net Assets Acquired			122,051,000
Identifiable Intangible Assets			269,000
Goodwill			15,525,000
DNB
Fair Value of Assets Acquired
Cash and cash equivalents	64,119,000		64,119,000	64,119,000	64,119,000
Adjustments, Cash and cash equivalents			0		0
Securities and other investments	108,898,000		108,898,000	108,898,000	108,898,000
Adjustments, Securities and other investments			183,000		0
Loans	906,607,000		908,984,000	906,607,000	906,607,000
Adjustments, Loans			(8,143,000)	2,500,000	(2,377,000)
Allowance for credit losses	0		0	0	0
Adjustments, Allowance for credit losses			6,487,000		0
Goodwill	85,842,000		84,175,000	85,842,000	85,842,000
Adjustments, Goodwill			(15,525,000)		1,667,000
Premises and equipment	14,872,000		14,872,000	14,872,000	14,872,000
Adjustments, Premises and equipment			8,090,000		0
Accrued interest receivable	4,138,000		4,138,000	4,138,000	4,138,000
Adjustments, Accrued interest receivable			0		0
Deferred income taxes	(970,000)		(1,281,000)	(970,000)	(970,000)
Adjustments, Deferred income taxes			(3,298,000)		311,000
Adjustments, Core deposits and other intangible assets			(269,000)
Other assets	20,679,000		20,605,000	20,679,000	20,679,000
Adjustments, Other assets			(4,278,000)		74,000
Total Assets Acquired	1,118,343,000		1,120,335,000	1,118,343,000	1,118,343,000
Adjustments, Total Assets Acquired			(16,753,000)		(1,992,000)
Fair Value of Liabilities Assumed
Deposits	967,265,000		967,265,000	967,265,000	967,265,000
Adjustments, Deposits			1,002,000		0
Borrowings	37,084,000		37,341,000	37,084,000	37,084,000
Adjustments, Borrowings			(276,000)		(257,000)
Accrued interest payable and other liabilities	7,905,000		7,973,000	7,905,000	7,905,000
Adjustments, Accrued interest payable and other liabilities			(3,184,000)		(68,000)
Total Liabilities Assumed	1,012,254,000		1,012,579,000	1,012,254,000	1,012,254,000
Adjustments, Total Liabilities Assumed			(2,458,000)		(325,000)
Total Net Assets Acquired	106,089,000		107,756,000	106,089,000	106,089,000
Adjustments, Total Net Assets Acquired			(14,295,000)		(1,667,000)
Total Fair Value of Net Assets Acquired and Identified	115,149,000		116,816,000	115,149,000	115,149,000
Adjustments, Total Fair Value of Net Assets Acquired and Identified					(1,667,000)
Cash			360,000
Common stock			200,631,000
Fair Value of Total Consideration			200,991,000
Goodwill	85,842,000		84,175,000	85,842,000	85,842,000
Core deposits | DNB
Fair Value of Assets Acquired
Core deposits and other intangible assets	7,288,000		7,288,000	7,288,000	7,288,000
Adjustments, Core deposits and other intangible assets					0
Fair Value of Liabilities Assumed
Identifiable Intangible Assets	7,288,000		7,288,000	7,288,000	7,288,000
Wealth management | DNB
Fair Value of Assets Acquired
Core deposits and other intangible assets	1,772,000		1,772,000	1,772,000	1,772,000
Adjustments, Core deposits and other intangible assets					0
Fair Value of Liabilities Assumed
Identifiable Intangible Assets	$ 1,772,000		$ 1,772,000	$ 1,772,000	$ 1,772,000

(Loss) Earnings Per Share (Deta

(Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator for (Loss) Earnings per Share Basic and Diluted:
Net (loss) income	$ (33,072)	$ 26,101	$ (19,841)	$ 49,029
Less: Income allocated to participating shares	0	72	0	137
Net (Loss) Income Allocated to Shareholders	(33,072)	26,029	(19,841)	48,892
Net (Loss) Income Available to Shareholders	$ (33,072)	$ 26,101	$ (19,841)	$ 49,029
Denominators for (Loss) Earnings per Share:
Weighted Average Shares Outstanding—Basic (in shares)	39,013,161	34,158,136	39,142,351	34,298,185
Add: Potentially dilutive shares (in shares)	0	52,850	0	88,121
Denominator for Treasury Stock Method—Diluted (in shares)	39,013,161	34,210,986	39,142,351	34,386,306
Weighted Average Shares Outstanding—Basic (in shares)	39,013,161	34,158,136	39,142,351	34,298,185
Add: Average participating shares outstanding (in shares)	0	93,433	0	96,261
Denominator for Two-Class Method—Diluted (in shares)	39,013,161	34,251,569	39,142,351	34,394,446
(Loss) earnings per share—basic (in dollars per share)	$ (0.85)	$ 0.76	$ (0.51)	$ 1.43
(Loss) earnings per share—diluted (in dollars per share)	$ (0.85)	$ 0.76	$ (0.51)	$ 1.43
Restricted Stock
Denominators for (Loss) Earnings per Share:
Anti-dilutive excluded from potentially dilutive shares (in shares)	21,333	5,183	82,624	44,153

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)		Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers between Level 1 to Level 2		$ 0	$ 0
ASSETS
Debt securities available-for-sale	[1]	801,703,000	779,133,000
Marketable equity securities		2,663,000	5,150,000
U.S. Treasury securities
ASSETS
Debt securities available-for-sale		10,355,000	10,040,000
Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		163,703,000	157,697,000
Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		181,162,000	189,348,000
Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		19,768,000	22,418,000
Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		284,550,000	275,870,000
Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale		137,127,000	116,133,000
Fair Value Measurements, Recurring
ASSETS
Debt securities available-for-sale		801,703,000	779,133,000
Marketable equity securities		2,663,000	5,150,000
Total securities		804,366,000	784,283,000
Securities held in a deferred compensation plan		5,489,000	5,987,000
Total Assets		906,809,000	816,239,000
LIABILITIES
Total Liabilities		94,880,000	25,615,000
Fair Value Measurements, Recurring | U.S. Treasury securities
ASSETS
Debt securities available-for-sale		10,355,000	10,040,000
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		163,703,000	157,697,000
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		181,162,000	189,348,000
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		19,768,000	22,418,000
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		284,550,000	275,870,000
Fair Value Measurements, Recurring | Corporate obligations
ASSETS
Debt securities available-for-sale		5,038,000	7,627,000
Fair Value Measurements, Recurring | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale		137,127,000	116,133,000
Fair Value Measurements, Recurring | Interest rate swaps
ASSETS
Derivative financial assets		94,371,000	25,647,000
LIABILITIES
Derivative financial liabilities		94,286,000	25,615,000
Fair Value Measurements, Recurring | Interest rate lock commitments
ASSETS
Derivative financial assets		2,583,000	321,000
Fair Value Measurements, Recurring | Forward sale contracts
ASSETS
Derivative financial assets			1,000
LIABILITIES
Derivative financial liabilities		594,000
Fair Value Measurements, Recurring | Level 1
ASSETS
Debt securities available-for-sale		0	0
Marketable equity securities		2,602,000	5,078,000
Total securities		2,602,000	5,078,000
Securities held in a deferred compensation plan		5,489,000	5,987,000
Total Assets		8,091,000	11,065,000
LIABILITIES
Total Liabilities		0	0
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 1 | Corporate obligations
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements, Recurring | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements, Recurring | Level 1 | Forward sale contracts
ASSETS
Derivative financial assets			0
LIABILITIES
Derivative financial liabilities		0
Fair Value Measurements, Recurring | Level 2
ASSETS
Debt securities available-for-sale		801,703,000	779,133,000
Marketable equity securities		61,000	72,000
Total securities		801,764,000	779,205,000
Securities held in a deferred compensation plan		0	0
Total Assets		898,718,000	805,174,000
LIABILITIES
Total Liabilities		94,880,000	25,615,000
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale		10,355,000	10,040,000
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		163,703,000	157,697,000
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		181,162,000	189,348,000
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		19,768,000	22,418,000
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		284,550,000	275,870,000
Fair Value Measurements, Recurring | Level 2 | Corporate obligations
ASSETS
Debt securities available-for-sale		5,038,000	7,627,000
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale		137,127,000	116,133,000
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets		94,371,000	25,647,000
LIABILITIES
Derivative financial liabilities		94,286,000	25,615,000
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets		2,583,000	321,000
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets			1,000
LIABILITIES
Derivative financial liabilities		594,000
Fair Value Measurements, Recurring | Level 3
ASSETS
Debt securities available-for-sale		0	0
Marketable equity securities		0	0
Total securities		0	0
Securities held in a deferred compensation plan		0	0
Total Assets		0	0
LIABILITIES
Total Liabilities		0	0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 3 | Corporate obligations
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions
ASSETS
Debt securities available-for-sale		0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements, Recurring | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets			$ 0
LIABILITIES
Derivative financial liabilities		$ 0
[1]	Excludes interest receivable of $3.4 million at June 30, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis by Significant Unobservable Inputs (Details) - Fair Value, Measurements, Nonrecurring	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a nonrecurring basis	$ 0	$ 0
Level 3
ASSETS
Total Assets	67,759,000	43,062,000
Collateral method | Level 3
ASSETS
Loans held for investment	61,068,000	38,697,000
Other real estate owned	2,413,000	3,231,000
Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights	$ 4,278,000	$ 1,134,000
Costs to sell | Collateral method | Level 3
ASSETS
Other real estate owned, measurement input		0.0700
Discount rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input	0.0325
Minimum | Costs to sell | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0	0
Other real estate owned, measurement input	0
Minimum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input		0.0475
Mortgage servicing rights, measurement input	0.0933	0.0939
Minimum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.0759	0.0746
Maximum | Costs to sell | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0.17	0.20
Other real estate owned, measurement input	0.0700
Maximum | Discount rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input		0.0550
Mortgage servicing rights, measurement input	0.1255	0.1254
Maximum | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.1358	0.1274
Weighted Average | Costs to sell | Collateral method | Level 3
ASSETS
Loans held for investment, measurement input	0.0681	0.0855
Other real estate owned, measurement input	0.0452	0.0700
Weighted Average | Discount rate | Discounted cash flow method | Level 3
ASSETS
Loans held for investment, measurement input	0.0325	0.0528
Mortgage servicing rights, measurement input	0.0944	0.0949
Weighted Average | Constant prepayment rates | Discounted cash flow method | Level 3
ASSETS
Mortgage servicing rights, measurement input	0.1295	0.0973

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
ASSETS
Securities, at fair value		$ 804,366		$ 784,283
Portfolio loans, net			$ 7,074,928
FHLB and other restricted stock		15,151		22,977
LIABILITIES
Junior subordinated debt securities		64,053		64,277
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	[1]	351,365		197,823
Securities, at fair value	[1]	804,366		784,283
Loans held for sale	[1]	14,259		5,256
Portfolio loans, net	[1]	7,433,949		7,074,928
Bank owned life insurance	[1]	81,443		80,473
FHLB and other restricted stock	[1]	15,151		22,977
Collateral receivable		91,736
Securities held in a deferred compensation plan	[1]	5,489		5,987
Mortgage servicing rights	[1]	4,279		4,662
LIABILITIES
Deposits	[1]	7,867,916		7,036,576
Securities sold under repurchase agreements	[1]	92,159		19,888
Short-term borrowings	[1]	84,541		281,319
Long-term borrowings	[1]	49,489		50,868
Junior subordinated debt securities	[1]	64,053		64,277
Carrying Value | Interest rate swaps
ASSETS
Derivative financial assets	[1]	94,371		25,647
LIABILITIES
Derivative financial liabilities	[1]	94,286		25,615
Carrying Value | Interest rate lock commitments
ASSETS
Derivative financial assets	[1]	2,583		321
Carrying Value | Forward sale contracts
ASSETS
Derivative financial assets	[1]			1
LIABILITIES
Derivative financial liabilities	[1]	594
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits		351,365		197,823
Securities, at fair value		804,366		784,283
Loans held for sale		14,072		5,256
Portfolio loans, net		7,422,797		6,940,875
Bank owned life insurance		81,443		80,473
FHLB and other restricted stock		15,151		22,977
Collateral receivable		91,736
Securities held in a deferred compensation plan		5,489		5,987
Mortgage servicing rights		4,279		4,650
LIABILITIES
Deposits		7,874,298		7,034,595
Securities sold under repurchase agreements		92,159		19,888
Short-term borrowings		84,541		281,319
Long-term borrowings		50,538		51,339
Junior subordinated debt securities		64,053		64,277
Fair Value Measurements | Interest rate swaps
ASSETS
Derivative financial assets		94,371		25,647
LIABILITIES
Derivative financial liabilities		94,286		25,615
Fair Value Measurements | Interest rate lock commitments
ASSETS
Derivative financial assets		2,583		321
Fair Value Measurements | Forward sale contracts
ASSETS
Derivative financial assets				1
LIABILITIES
Derivative financial liabilities		594
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits		351,365		197,823
Securities, at fair value		2,602		5,078
Loans held for sale		0		0
Portfolio loans, net		0		0
Bank owned life insurance		0		0
FHLB and other restricted stock		0		0
Collateral receivable		91,736
Securities held in a deferred compensation plan		5,489		5,987
Mortgage servicing rights		0		0
LIABILITIES
Deposits		6,344,076		5,441,143
Securities sold under repurchase agreements		92,159		19,888
Short-term borrowings		84,541		281,319
Long-term borrowings		4,585		4,678
Junior subordinated debt securities		64,053		64,277
Fair Value Measurements | Level 1 | Interest rate swaps
ASSETS
Derivative financial assets		0		0
LIABILITIES
Derivative financial liabilities		0		0
Fair Value Measurements | Level 1 | Interest rate lock commitments
ASSETS
Derivative financial assets		0		0
Fair Value Measurements | Level 1 | Forward sale contracts
ASSETS
Derivative financial assets				0
LIABILITIES
Derivative financial liabilities		0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits		0		0
Securities, at fair value		801,764		779,205
Loans held for sale		0		0
Portfolio loans, net		0		0
Bank owned life insurance		81,443		80,473
FHLB and other restricted stock		0		0
Collateral receivable		0
Securities held in a deferred compensation plan		0		0
Mortgage servicing rights		0		0
LIABILITIES
Deposits		1,530,222		1,593,452
Securities sold under repurchase agreements		0		0
Short-term borrowings		0		0
Long-term borrowings		45,953		46,661
Junior subordinated debt securities		0		0
Fair Value Measurements | Level 2 | Interest rate swaps
ASSETS
Derivative financial assets		94,371		25,647
LIABILITIES
Derivative financial liabilities		94,286		25,615
Fair Value Measurements | Level 2 | Interest rate lock commitments
ASSETS
Derivative financial assets		2,583		321
Fair Value Measurements | Level 2 | Forward sale contracts
ASSETS
Derivative financial assets				1
LIABILITIES
Derivative financial liabilities		594
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits		0		0
Securities, at fair value		0		0
Loans held for sale		14,072		5,256
Portfolio loans, net		7,422,797		6,940,875
Bank owned life insurance		0		0
FHLB and other restricted stock		15,151		22,977
Collateral receivable		0
Securities held in a deferred compensation plan		0		0
Mortgage servicing rights		4,279		4,650
LIABILITIES
Deposits		0		0
Securities sold under repurchase agreements		0		0
Short-term borrowings		0		0
Long-term borrowings		0		0
Junior subordinated debt securities		0		0
Fair Value Measurements | Level 3 | Interest rate swaps
ASSETS
Derivative financial assets		0		0
LIABILITIES
Derivative financial liabilities		0		0
Fair Value Measurements | Level 3 | Interest rate lock commitments
ASSETS
Derivative financial assets		0		0
Fair Value Measurements | Level 3 | Forward sale contracts
ASSETS
Derivative financial assets				$ 0
LIABILITIES
Derivative financial liabilities		$ 0
[1]	(1) As reported in the Consolidated Balance Sheets

Securities - Fair Values and Am

Securities - Fair Values and Amortized Costs Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	[1]	$ 765,374	$ 768,427
Debt Securities, Available-for-Sale, Gross Unrealized Gains	[1]	36,330	11,659
Debt Securities, Available-for-Sale, Gross Unrealized Losses	[1]	(1)	(953)
Debt Securities, Available-for-Sale, Fair Value	[1]	801,703	779,133
Marketable equity securities		2,663	5,150
Total Securities		804,366	784,283
Interest receivable		3,400	3,400
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		9,975	9,969
Debt Securities, Available-for-Sale, Gross Unrealized Gains		380	71
Debt Securities, Available-for-Sale, Gross Unrealized Losses		0
Debt Securities, Available-for-Sale, Fair Value		10,355	10,040
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		158,869	155,969
Debt Securities, Available-for-Sale, Gross Unrealized Gains		4,835	1,773
Debt Securities, Available-for-Sale, Gross Unrealized Losses		(1)	(45)
Debt Securities, Available-for-Sale, Fair Value		163,703	157,697
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		172,938	186,879
Debt Securities, Available-for-Sale, Gross Unrealized Gains		8,224	2,773
Debt Securities, Available-for-Sale, Gross Unrealized Losses		0	(304)
Debt Securities, Available-for-Sale, Fair Value		181,162	189,348
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		18,891	22,120
Debt Securities, Available-for-Sale, Gross Unrealized Gains		877	321
Debt Securities, Available-for-Sale, Gross Unrealized Losses		0	(23)
Debt Securities, Available-for-Sale, Fair Value		19,768	22,418
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		269,673	273,771
Debt Securities, Available-for-Sale, Gross Unrealized Gains		14,877	2,680
Debt Securities, Available-for-Sale, Gross Unrealized Losses		0	(581)
Debt Securities, Available-for-Sale, Fair Value		284,550	275,870
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		5,026	7,603
Debt Securities, Available-for-Sale, Gross Unrealized Gains		12	24
Debt Securities, Available-for-Sale, Gross Unrealized Losses		0	0
Debt Securities, Available-for-Sale, Fair Value		5,038	7,627
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost		130,002	112,116
Debt Securities, Available-for-Sale, Gross Unrealized Gains		7,125	4,017
Debt Securities, Available-for-Sale, Gross Unrealized Losses		0	0
Debt Securities, Available-for-Sale, Fair Value		$ 137,127	$ 116,133
[1]	Excludes interest receivable of $3.4 million at June 30, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.

Securities - Fair Value and Age

Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands	Jun. 30, 2020USD ($)security	Dec. 31, 2019USD ($)security
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	2	20
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 49,991	$ 137,097
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (1)	$ (701)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	7
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 27,788
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ (252)
Temporarily Impaired Debt Securities, Number of Securities | security	2	27
Temporarily Impaired Debt Securities, Fair Value, Total	$ 49,991	$ 164,885
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1)	$ (953)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 0
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ 0
Obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	1	3
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 49,990	$ 22,638
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ (1)	$ (45)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, Number of Securities | security	1	3
Temporarily Impaired Debt Securities, Fair Value, Total	$ 49,990	$ 22,638
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1)	$ (45)
Collateralized mortgage obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	1	6
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 1	$ 23,393
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (73)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	6
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 25,254
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ (231)
Temporarily Impaired Debt Securities, Number of Securities | security	1	12
Temporarily Impaired Debt Securities, Fair Value, Total	$ 1	$ 48,647
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (304)
Residential mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	1
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 982
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (2)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 2,534
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ (21)
Temporarily Impaired Debt Securities, Number of Securities | security	0	2
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 3,516
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (23)
Commercial mortgage-backed securities of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	9
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 90,005
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (581)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, Number of Securities | security	0	9
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 90,005
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (581)
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	1
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 79
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, Number of Securities | security	0	1
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 79
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ 0
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value	$ 0	$ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Temporarily Impaired Debt Securities, Number of Securities | security	0	0
Temporarily Impaired Debt Securities, Fair Value, Total	$ 0	$ 0
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ 0

Securities - Additional Informa

Securities - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)security	Dec. 31, 2019USD ($)security
Investments, Debt and Equity Securities [Abstract]
Number of debt securities in unrealized loss position | security		2	27
OTTI	$ 0
Securities pledged for regulatory and legal requirements		$ 340,600,000	$ 286,000,000

Securities - Unrealized Gains (

Securities - Unrealized Gains (Losses) of Debt Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Gains	[1]	$ 36,330	$ 11,659
Total unrealized gains/(losses) on debt securities available-for-sale, Gross Unrealized Losses	[1]	(1)	(953)
Total unrealized gains/(losses) on debt securities available-for-sale, Net Unrealized Gains/(Losses)		36,329	10,706
Income tax (expense) benefit, Gross Unrealized Gains		(7,736)	(2,486)
Income tax (expense) benefit, Gross Unrealized Losses		0	203
Income tax (expense) benefit, Net Unrealized Gains/(Losses)		(7,736)	(2,283)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Loss, Gross Unrealized Gains		28,594	9,173
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Loss, Gross Unrealized Losses		(1)	(750)
Net Unrealized Gains/(Losses), Net of Tax Included in Accumulated Other Comprehensive Loss, Net Unrealized Gains/(Losses)		$ 28,593	$ 8,423
[1]	Excludes interest receivable of $3.4 million at June 30, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.

Securities - Contractual Maturi

Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less		$ 106,927
Due after one year through five years		105,757
Due after five years through ten years		55,138
Due after ten years		31,024
Debt Securities Available-for-sale, Maturity, Amortized Cost		298,846
Debt Securities, Available-for-Sale, Amortized Cost	[1]	765,374	$ 768,427
Fair Value
Due in one year or less		107,417
Due after one year through five years		111,561
Due after five years through ten years		58,778
Due after ten years		33,429
Debt Securities Available-for-sale, Maturity, Fair Value		311,185
Debt Securities, Available-for-Sale, Fair Value	[1]	801,703	779,133
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Maturities		172,938
Debt Securities, Available-for-Sale, Amortized Cost		172,938	186,879
Fair Value
Available-for-Sale Debt Securities With Maturities		181,162
Debt Securities, Available-for-Sale, Fair Value		181,162	189,348
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Maturities		18,891
Debt Securities, Available-for-Sale, Amortized Cost		18,891	22,120
Fair Value
Available-for-Sale Debt Securities With Maturities		19,768
Debt Securities, Available-for-Sale, Fair Value		19,768	22,418
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Maturities		269,673
Debt Securities, Available-for-Sale, Amortized Cost		269,673	273,771
Fair Value
Available-for-Sale Debt Securities With Maturities		284,550
Debt Securities, Available-for-Sale, Fair Value		284,550	$ 275,870
Corporate Securities
Amortized Cost
Available-for-Sale Debt Securities With Maturities		5,026
Fair Value
Available-for-Sale Debt Securities With Maturities		$ 5,038
[1]	Excludes interest receivable of $3.4 million at June 30, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.

Securities - Unrealized Gains_2

Securities - Unrealized Gains (Losses) on Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Net gains and losses recognized during the period on equity securities	$ 448	$ 52	$ (1,137)	$ (266)
Less: Net gains and losses recognized during the period on equity securities sold during the period	142	0	142	0
Unrealized Losses/Gains Recognized During the Reporting Period on Equity Securities Still Held at the Reporting Date	$ 306	$ 52	$ (1,279)	$ (266)

Loans and Loans Held for Sale -

Loans and Loans Held for Sale - Additional Information (Details) $ in Thousands		Jun. 30, 2020USD ($)loan	Dec. 31, 2019USD ($)	Jun. 30, 2020USD ($)loan	Mar. 31, 2020USD ($)	Jun. 30, 2019USD ($)loan	Jun. 30, 2020USD ($)noteloan	Jun. 30, 2019USD ($)loan	Dec. 31, 2019USD ($)	Jan. 01, 2020USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		$ 16,700	$ 4,600	$ 16,700			$ 16,700		$ 4,600
Purchase accounting fair value adjustments		10,500	12,300
Total loans										$ 7,074,928
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status							6 months
Restructured loans	[1],[2]			1,304		$ 6,427	$ 7,853	$ 11,248
Allowance for credit loss		$ 114,609	$ 62,224	$ 114,609	$ 96,850	$ 61,479	$ 114,609	$ 61,479	$ 62,224	$ 62,224	$ 61,409	$ 60,996
Number of troubled debt restructuring loans returned to accruing status | loan				4		3	4	4
Amount of trouble debt restructuring loans returned to accruing status				$ 100		$ 100	$ 100	$ 1,800
Number of loans | loan	[2]			11		14	20	25
Number of commitments to lend additional funds on TDRs | loan		22		22			22
Commitments to lend additional funds on TDRs		$ 3,100		$ 3,100			$ 3,100
Minimum period of loan payment defaults following restructure for TDRs to be in default							90 days
Number of defaulted TDRs that were restructured within the last twelve months prior to defaulting | loan				1		0	11	0
Amount of defaulted TDRs that were restructured within the last twelve months prior to defaulting				$ 100			$ 21,100
Number of notes related to individual customer resulting in an increase in defaulted troubled debt restructuring loans due to Covid-19 | note							5
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of commercial loans in total portfolio loans		78.80%	77.20%	78.80%			78.80%		77.20%
Commercial loans			$ 5,512,796						$ 5,512,796
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans	[1]			$ 0		$ 6,090	$ 2,210	$ 6,090
Allowance for credit loss						$ 32,836		$ 32,836			34,903	33,707
Number of loans | loan				0		3	1	3
Commercial real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans			3,416,518						3,416,518
Allowance for credit loss		$ 57,730	30,577	$ 57,730	42,611		$ 57,730		30,577
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans	[1]			$ 102		$ 0	$ 2,170	$ 4,529
Allowance for credit loss						$ 13,227		$ 13,227			$ 11,996	$ 11,596
Number of loans | loan				2		0	3	1
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans			1,720,833						1,720,833
Allowance for credit loss		19,164	15,681	$ 19,164	19,870		$ 19,164		15,681
Customer fraud
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		15,100		15,100			15,100
CRE and commercial construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans		$ 3,800,000	$ 3,800,000	$ 3,800,000			$ 3,800,000		$ 3,800,000
Combined percentage of commercial real estate and commercial construction in total commercial loans		64.00%	68.80%	64.00%			64.00%		68.80%
Combined percentage of commercial real estate and commercial construction in total portfolio loans		50.40%	53.10%	50.40%			50.40%		53.10%
Concentration risk percentage of commercial real estate and commercial construction							0.00%		0.00%
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)		14.00%	11.00%	14.00%			14.00%		11.00%
Out of market exposure of combined portfolio (percent)		5.70%	5.40%	5.70%			5.70%		5.40%
Percentage of total loans out-of-state excluding contiguous states		3.00%	2.90%	3.00%			3.00%		2.90%
CARES Act, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 547,600		$ 547,600			$ 547,600
Restructured loans							$ 1,400,000
Number of loans | loan							2,360
Nonperforming TDRs | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans					$ 20,500		$ 20,500
Allowance for credit loss		$ 600		600			600
Nonperforming TDRs | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans							4,300
Nonperforming TDRs | Customer fraud
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans				$ 10,900			$ 10,900
[1]	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.
[2]	Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instrument.

Loans and Loans Held for Sale_2

Loans and Loans Held for Sale - Composition of Loans (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Composition of the loans
Portfolio loans, net of unearned income		$ 7,548,558	$ 7,137,152
Loans held for sale		14,259	5,256
Total Loans	[1]	7,562,817	7,142,408
Interest receivable		25,400	22,100
Commercial
Composition of the loans
Portfolio loans, net of unearned income		5,945,132	5,512,796
Commercial | Commercial real estate
Composition of the loans
Portfolio loans, net of unearned income		3,345,513	3,416,518
Commercial | Commercial and industrial
Composition of the loans
Portfolio loans, net of unearned income		2,140,355	1,720,833
Commercial | Commercial construction
Composition of the loans
Portfolio loans, net of unearned income		459,264	375,445
Consumer
Composition of the loans
Portfolio loans, net of unearned income		1,603,426	1,624,356
Consumer | Residential Mortgage
Composition of the loans
Portfolio loans, net of unearned income		971,023	998,585
Consumer | Home equity
Composition of the loans
Portfolio loans, net of unearned income		539,519	538,348
Consumer | Installment and other consumer
Composition of the loans
Portfolio loans, net of unearned income		79,816	79,033
Consumer | Consumer construction
Composition of the loans
Portfolio loans, net of unearned income		$ 13,068	$ 8,390
[1]	Excludes interest receivable of $25.4 million at June 30, 2020 and $22.1 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.

Loans and Loans Held for Sale_3

Loans and Loans Held for Sale - Summary of Restructured Loans (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended			12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	[1],[2]	$ 1,304	$ 6,427	$ 7,853		$ 11,248
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	[1]	0	6,090	2,210		6,090
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	[1]	102	0	2,170		4,529
Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	[1]	701	0	2,572		0
Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	[1]	310	115	337		163
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	[1]	$ 191	213	564		457
Installment and other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	[1]		$ 9			$ 9
Performing TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				15,536	[3]		$ 36,960
Performing TDRs | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				25			22,233
Performing TDRs | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				4,388			6,909
Performing TDRs | Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				3,997			1,425
Performing TDRs | Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				1,488
Performing TDRs | Consumer real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				5,635
Performing TDRs | Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							2,013
Performing TDRs | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							4,371
Performing TDRs | Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				3
Performing TDRs | Installment and other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							9
Nonperforming TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				31,755	[3]		8,912
Nonperforming TDRs | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				27,100			6,713
Nonperforming TDRs | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				2,068			695
Nonperforming TDRs | Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				0			0
Nonperforming TDRs | Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				349
Nonperforming TDRs | Consumer real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				2,238
Nonperforming TDRs | Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							822
Nonperforming TDRs | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							678
Nonperforming TDRs | Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				0
Nonperforming TDRs | Installment and other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							4
Total TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				47,291	[3]		45,872
Total TDRs | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				27,125			28,946
Total TDRs | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				6,456			7,604
Total TDRs | Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				3,997			1,425
Total TDRs | Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				1,837
Total TDRs | Consumer real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				7,873
Total TDRs | Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							2,835
Total TDRs | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							5,049
Total TDRs | Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans				$ 3
Total TDRs | Installment and other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans							$ 13
[1]	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.
[2]	Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instrument.
[3]	Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.

Loans and Loans Held for Sale_4

Loans and Loans Held for Sale - Restructured Loans By Segment and Type of Concession (Details)		3 Months Ended			6 Months Ended
		Jun. 30, 2020USD ($)loan	Jun. 30, 2019USD ($)loan		Jun. 30, 2020USD ($)loan	Jun. 30, 2019USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[1]	11	14		20	25
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 1,370,000	$ 6,504,000		$ 8,341,000	$ 11,577,000
Post-Modification Outstanding Recorded Investment	[1],[2]	1,304,000	6,427,000		7,853,000	11,248,000
Total  Difference in Recorded Investment	[1]	$ (66,000)	$ (77,000)		$ (488,000)	$ (329,000)
Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0			2
Pre-Modification Outstanding Recorded Investment	[2]	$ 0			$ 4,677,000
Post-Modification Outstanding Recorded Investment	[2]	0			4,278,000
Total  Difference in Recorded Investment		$ 0			$ (399,000)
Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	1		1	2
Pre-Modification Outstanding Recorded Investment	[2]	$ 75,000	$ 151,000		$ 75,000	$ 4,902,000
Post-Modification Outstanding Recorded Investment	[2]	75,000	148,000		75,000	4,677,000
Total  Difference in Recorded Investment		$ 0	$ (3,000)		$ 0	$ (225,000)
Payment deferral resulting in payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans		1			1
Pre-Modification Outstanding Recorded Investment	[2]	$ 93,000			$ 93,000
Post-Modification Outstanding Recorded Investment	[2]	27,000			27,000
Total  Difference in Recorded Investment		$ (66,000)			$ (66,000)
Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	1		3	1
Pre-Modification Outstanding Recorded Investment	[2]	$ 701,000	$ 1,322,000		$ 2,592,000	$ 1,322,000
Post-Modification Outstanding Recorded Investment	[2]	701,000	1,311,000		2,572,000	1,311,000
Total  Difference in Recorded Investment		$ 0	$ (11,000)		$ (20,000)	$ (11,000)
Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		5	10	[3]	10	19	[3]
Pre-Modification Outstanding Recorded Investment		$ 351,000	$ 232,000	[2],[3]	$ 727,000	$ 473,000	[2],[3]
Post-Modification Outstanding Recorded Investment		351,000	229,000	[2],[3]	724,000	440,000	[2],[3]
Total  Difference in Recorded Investment		$ 0	$ (3,000)	[3]	$ (3,000)	$ (33,000)	[3]
Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1			2
Pre-Modification Outstanding Recorded Investment	[2]		$ 109,000			$ 190,000
Post-Modification Outstanding Recorded Investment	[2]		108,000			189,000
Total  Difference in Recorded Investment			$ (1,000)			$ (1,000)
Maturity date extension and payment reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2			3
Pre-Modification Outstanding Recorded Investment	[2]	$ 150,000			$ 177,000
Post-Modification Outstanding Recorded Investment	[2]	150,000			177,000
Total  Difference in Recorded Investment		$ 0			$ 0
Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1			1
Pre-Modification Outstanding Recorded Investment	[2]		$ 4,690,000			$ 4,690,000
Post-Modification Outstanding Recorded Investment	[2]		4,631,000			4,631,000
Total  Difference in Recorded Investment			$ (59,000)			$ (59,000)
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	3		1	3
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 6,163,000		$ 2,210,000	$ 6,163,000
Post-Modification Outstanding Recorded Investment	[2]	0	6,090,000		2,210,000	6,090,000
Total  Difference in Recorded Investment		$ 0	$ (73,000)		$ 0	$ (73,000)
Commercial real estate | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0			1
Pre-Modification Outstanding Recorded Investment	[2]	$ 0			$ 2,210,000
Post-Modification Outstanding Recorded Investment	[2]	0			2,210,000
Total  Difference in Recorded Investment		$ 0			$ 0
Commercial real estate | Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1			1
Pre-Modification Outstanding Recorded Investment	[2]		$ 151,000			$ 151,000
Post-Modification Outstanding Recorded Investment	[2]		148,000			148,000
Total  Difference in Recorded Investment			$ (3,000)			$ (3,000)
Commercial real estate | Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1			1
Pre-Modification Outstanding Recorded Investment	[2]		$ 1,322,000			$ 1,322,000
Post-Modification Outstanding Recorded Investment	[2]		1,311,000			1,311,000
Total  Difference in Recorded Investment			$ (11,000)			$ (11,000)
Commercial real estate | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1			1
Pre-Modification Outstanding Recorded Investment	[2]		$ 4,690,000			$ 4,690,000
Post-Modification Outstanding Recorded Investment	[2]		4,631,000			4,631,000
Total  Difference in Recorded Investment			$ (59,000)			$ (59,000)
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	0		3	1
Pre-Modification Outstanding Recorded Investment	[2]	$ 168,000	$ 0		$ 2,635,000	$ 4,751,000
Post-Modification Outstanding Recorded Investment	[2]	102,000	0		2,170,000	4,529,000
Total  Difference in Recorded Investment		$ (66,000)	$ 0		$ (465,000)	$ (222,000)
Commercial and industrial | Principal deferral and maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans		0			1
Pre-Modification Outstanding Recorded Investment	[2]	$ 0			$ 2,467,000
Post-Modification Outstanding Recorded Investment	[2]	0			2,068,000
Total  Difference in Recorded Investment		$ 0			$ (399,000)
Commercial and industrial | Maturity date extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1	0		1	1
Pre-Modification Outstanding Recorded Investment	[2]	$ 75,000	$ 0		$ 75,000	$ 4,751,000
Post-Modification Outstanding Recorded Investment	[2]	75,000	0		75,000	4,529,000
Total  Difference in Recorded Investment		$ 0	$ 0		$ 0	$ (222,000)
Commercial and industrial | Payment deferral resulting in payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans		1			1
Pre-Modification Outstanding Recorded Investment	[2]	$ 93,000			$ 93,000
Post-Modification Outstanding Recorded Investment	[2]	27,000			27,000
Total  Difference in Recorded Investment		$ (66,000)			$ (66,000)
Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2	0		3	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 701,000	$ 0		$ 2,592,000	$ 0
Post-Modification Outstanding Recorded Investment	[2]	701,000	0		2,572,000	0
Total  Difference in Recorded Investment		$ 0	$ 0		$ (20,000)	$ 0
Commercial construction | Maturity date extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2			3
Pre-Modification Outstanding Recorded Investment	[2]	$ 701,000			$ 2,592,000
Post-Modification Outstanding Recorded Investment	[2]	701,000			2,572,000
Total  Difference in Recorded Investment		$ 0			$ (20,000)
Residential Mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3	2		4	3
Pre-Modification Outstanding Recorded Investment	[2]	$ 310,000	$ 116,000		$ 337,000	$ 166,000
Post-Modification Outstanding Recorded Investment	[2]	310,000	115,000		337,000	163,000
Total  Difference in Recorded Investment		$ 0	$ (1,000)		$ 0	$ (3,000)
Residential Mortgage | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[3]	1	2		1	3
Pre-Modification Outstanding Recorded Investment	[2],[3]	$ 160,000	$ 116,000		$ 160,000	$ 166,000
Post-Modification Outstanding Recorded Investment	[2],[3]	160,000	115,000		160,000	163,000
Total  Difference in Recorded Investment	[3]	$ 0	$ (1,000)		$ 0	$ (3,000)
Residential Mortgage | Maturity date extension and payment reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		2			3
Pre-Modification Outstanding Recorded Investment	[2]	$ 150,000			$ 177,000
Post-Modification Outstanding Recorded Investment	[2]	150,000			177,000
Total  Difference in Recorded Investment		$ 0			$ 0
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		4	7		9	15
Pre-Modification Outstanding Recorded Investment	[2]	$ 191,000	$ 216,000		$ 567,000	$ 488,000
Post-Modification Outstanding Recorded Investment	[2]	191,000	213,000		564,000	457,000
Total  Difference in Recorded Investment		$ 0	$ (3,000)		$ (3,000)	$ (31,000)
Home equity | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[3]	4	6		9	13
Pre-Modification Outstanding Recorded Investment	[2],[3]	$ 191,000	$ 107,000		$ 567,000	$ 298,000
Post-Modification Outstanding Recorded Investment	[2],[3]	191,000	105,000		564,000	268,000
Total  Difference in Recorded Investment	[3]	$ 0	$ (2,000)		$ (3,000)	$ (30,000)
Home equity | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1			2
Pre-Modification Outstanding Recorded Investment	[2]		$ 109,000			$ 190,000
Post-Modification Outstanding Recorded Investment	[2]		108,000			189,000
Total  Difference in Recorded Investment			$ (1,000)			$ (1,000)
Installment and other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			2			3
Pre-Modification Outstanding Recorded Investment	[2]		$ 9,000			$ 9,000
Post-Modification Outstanding Recorded Investment	[2]		9,000			9,000
Total  Difference in Recorded Investment			$ 0			$ 0
Installment and other consumer | Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	[3]		2			3
Pre-Modification Outstanding Recorded Investment	[2],[3]		$ 9,000			$ 9,000
Post-Modification Outstanding Recorded Investment	[2],[3]		9,000			9,000
Total  Difference in Recorded Investment	[3]		$ 0			$ 0
[1]	Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instrument.
[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.
[3]	Consumer bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

Loans and Loans Held for Sale_5

Loans and Loans Held for Sale - Nonperforming Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Dec. 31, 2019
Nonperforming Assets
Nonaccrual loans	$ 58,358		$ 45,145
Nonaccrual TDRs	31,755		8,912
Total Nonaccrual Loans	90,113	[1]	54,057
OREO	2,740		3,525
Total Nonperforming Assets	$ 92,853		$ 57,582
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.

Allowance for Credit Losses - L

Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,004,189
2019	1,260,757
2018	963,963
2017	665,166
2016	701,082
2015 and Prior	1,885,082
Revolving	1,059,103
Revolving-Term	9,216
Total	7,548,558	[1]	$ 7,137,152
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	231,670
2019	477,527
2018	444,368
2017	350,151
2016	431,828
2015 and Prior	872,712
Revolving	53,847
Revolving-Term	0
Total	2,862,103
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	231,670
2019	468,786
2018	443,243
2017	327,871
2016	401,126
2015 and Prior	769,224
Revolving	48,527
Revolving-Term	0
Total	2,690,447
Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	8,741
2018	187
2017	13,182
2016	8,172
2015 and Prior	50,717
Revolving	2,350
Revolving-Term	0
Total	83,349
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	938
2017	9,098
2016	22,059
2015 and Prior	49,912
Revolving	2,890
Revolving-Term	0
Total	84,897
Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	471
2015 and Prior	2,859
Revolving	80
Revolving-Term	0
Total	3,410
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	351,004
2019	243,588
2018	169,080
2017	104,375
2016	63,338
2015 and Prior	322,811
Revolving	428,436
Revolving-Term	44
Total	1,682,676
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	350,890
2019	224,067
2018	162,559
2017	88,479
2016	56,286
2015 and Prior	301,155
Revolving	383,176
Revolving-Term	44
Total	1,566,656
Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	39
2019	14,104
2018	3,722
2017	917
2016	6,977
2015 and Prior	10,302
Revolving	42,199
Revolving-Term	0
Total	78,260
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	75
2019	5,417
2018	2,799
2017	14,979
2016	75
2015 and Prior	11,354
Revolving	3,061
Revolving-Term	0
Total	37,760
Commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015 and Prior	0
Revolving	0
Revolving-Term	0
Total	0
Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	67,685
2019	206,187
2018	111,508
2017	19,241
2016	17,335
2015 and Prior	19,207
Revolving	11,935
Revolving-Term	0
Total	453,098
Commercial construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	67,685
2019	206,187
2018	107,927
2017	17,499
2016	17,335
2015 and Prior	10,533
Revolving	11,844
Revolving-Term	0
Total	439,010
Commercial construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	3,581
2017	0
2016	0
2015 and Prior	5,076
Revolving	91
Revolving-Term	0
Total	8,748
Commercial construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	1,742
2016	0
2015 and Prior	3,598
Revolving	0
Revolving-Term	0
Total	5,340
Commercial construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015 and Prior	0
Revolving	0
Revolving-Term	0
Total	0
Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
2020	289,837
2019	172,630
2018	147,368
2017	105,944
2016	94,054
2015 and Prior	345,569
Revolving	111,911
Revolving-Term	1,522
Total	1,268,835
Business banking | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	289,837
2019	171,903
2018	142,912
2017	99,586
2016	88,874
2015 and Prior	310,932
Revolving	110,498
Revolving-Term	1,247
Total	1,215,789
Business banking | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	100
2018	1,341
2017	1,742
2016	1,144
2015 and Prior	7,071
Revolving	733
Revolving-Term	69
Total	12,200
Business banking | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	627
2018	3,115
2017	4,616
2016	4,036
2015 and Prior	27,566
Revolving	680
Revolving-Term	206
Total	40,846
Business banking | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015 and Prior	0
Revolving	0
Revolving-Term	0
Total	0
Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	59,273
2019	143,279
2018	82,271
2017	80,015
2016	89,580
2015 and Prior	318,383
Revolving	422,189
Revolving-Term	7,123
Total	1,202,113
Consumer real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	59,273
2019	143,091
2018	81,972
2017	79,203
2016	87,809
2015 and Prior	309,636
Revolving	421,987
Revolving-Term	7,123
Total	1,190,094
Consumer real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	798
2015 and Prior	300
Revolving	0
Revolving-Term	0
Total	1,098
Consumer real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	188
2018	299
2017	812
2016	973
2015 and Prior	8,447
Revolving	202
Revolving-Term	0
Total	10,921
Consumer real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015 and Prior	0
Revolving	0
Revolving-Term	0
Total	0
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,720
2019	17,546
2018	9,368
2017	5,440
2016	4,947
2015 and Prior	6,400
Revolving	30,785
Revolving-Term	527
Total	79,733
Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,720
2019	16,987
2018	9,223
2017	5,323
2016	4,256
2015 and Prior	1,561
Revolving	30,377
Revolving-Term	268
Total	72,715
Other consumer | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015 and Prior	0
Revolving	0
Revolving-Term	0
Total	0
Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	559
2018	145
2017	117
2016	691
2015 and Prior	4,839
Revolving	408
Revolving-Term	259
Total	7,018
Other consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
2015 and Prior	0
Revolving	0
Revolving-Term	0
Total	$ 0
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.

Allowance for Credit Losses -_2

Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,004,189
2019	1,260,757
2018	963,963
2017	665,166
2016	701,082
2015 and Prior	1,885,082
Revolving	1,059,103
Revolving-Term	9,216
Total	7,548,558	[1]	$ 7,137,152
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,004,189
2019	1,259,835
2018	960,948
2017	661,501
2016	678,413
2015 and Prior	1,831,427
Revolving	1,053,073
Revolving-Term	9,059
Total	7,458,445
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	922
2018	3,015
2017	3,665
2016	22,668
2015 and Prior	53,655
Revolving	6,030
Revolving-Term	157
Total	90,113
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	231,670
2019	477,527
2018	444,368
2017	350,151
2016	431,828
2015 and Prior	872,712
Revolving	53,847
Revolving-Term	0
Total	2,862,103
Commercial real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	231,670
2019	477,527
2018	444,368
2017	350,151
2016	411,792
2015 and Prior	839,942
Revolving	50,877
Revolving-Term	0
Total	2,806,327
Commercial real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	20,036
2015 and Prior	32,770
Revolving	2,970
Revolving-Term	0
Total	55,776
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	351,004
2019	243,588
2018	169,080
2017	104,375
2016	63,338
2015 and Prior	322,811
Revolving	428,436
Revolving-Term	44
Total	1,682,676
Commercial and industrial | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	351,004
2019	243,588
2018	168,814
2017	104,375
2016	63,338
2015 and Prior	322,811
Revolving	426,076
Revolving-Term	44
Total	1,680,050
Commercial and industrial | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	266
2017	0
2016	0
2015 and Prior	0
Revolving	2,360
Revolving-Term	0
Total	2,626
Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
2020	67,685
2019	206,187
2018	111,508
2017	19,241
2016	17,335
2015 and Prior	19,207
Revolving	11,935
Revolving-Term	0
Total	453,098
Commercial construction | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	67,685
2019	206,187
2018	111,508
2017	18,200
2016	17,335
2015 and Prior	18,744
Revolving	11,935
Revolving-Term	0
Total	451,594
Commercial construction | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	1,041
2016	0
2015 and Prior	463
Revolving	0
Revolving-Term	0
Total	1,504
Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
2020	289,837
2019	172,630
2018	147,368
2017	105,944
2016	94,054
2015 and Prior	345,569
Revolving	111,911
Revolving-Term	1,522
Total	1,268,835
Business banking | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	289,837
2019	172,290
2018	145,563
2017	104,549
2016	92,708
2015 and Prior	334,316
Revolving	111,696
Revolving-Term	1,401
Total	1,252,360
Business banking | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	340
2018	1,805
2017	1,395
2016	1,346
2015 and Prior	11,253
Revolving	215
Revolving-Term	121
Total	16,475
Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	59,273
2019	143,279
2018	82,271
2017	80,015
2016	89,580
2015 and Prior	318,383
Revolving	422,189
Revolving-Term	7,123
Total	1,202,113
Consumer real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	59,273
2019	143,174
2018	81,327
2017	78,888
2016	88,576
2015 and Prior	309,984
Revolving	421,895
Revolving-Term	7,123
Total	1,190,240
Consumer real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	105
2018	944
2017	1,127
2016	1,004
2015 and Prior	8,399
Revolving	294
Revolving-Term	0
Total	11,873
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,720
2019	17,546
2018	9,368
2017	5,440
2016	4,947
2015 and Prior	6,400
Revolving	30,785
Revolving-Term	527
Total	79,733
Other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,720
2019	17,069
2018	9,368
2017	5,338
2016	4,664
2015 and Prior	5,630
Revolving	30,594
Revolving-Term	491
Total	77,874
Other consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	477
2018	0
2017	102
2016	283
2015 and Prior	770
Revolving	191
Revolving-Term	36
Total	$ 1,859
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.

Allowance for Credit Losses - A

Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2020USD ($)loan		Jun. 30, 2019USD ($)loan	Jun. 30, 2020USD ($)loan		Jun. 30, 2019USD ($)loan	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
Financing Receivable, Past Due [Line Items]
Current		$ 7,446,796	[1]		$ 7,446,796	[1]			$ 7,055,361
Past due		101,762	[1]		101,762	[1]			81,791
Non - performing		90,113	[1]		90,113	[1]			54,057
Total		$ 7,548,558	[1]		$ 7,548,558	[1]			7,137,152
Number of loans | loan	[2]	11		14	20		25
Restructured loans	[2],[3]	$ 1,304		$ 6,427	$ 7,853		$ 11,248
Commercial real estate
Financing Receivable, Past Due [Line Items]
Number of loans | loan		0		3	1		3
Restructured loans	[3]	$ 0		$ 6,090	$ 2,210		$ 6,090
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Number of loans | loan		2		0	3		1
Restructured loans	[3]	$ 102		$ 0	$ 2,170		$ 4,529
Commercial construction
Financing Receivable, Past Due [Line Items]
Number of loans | loan		2		0	3		0
Restructured loans	[3]	$ 701		$ 0	$ 2,572		$ 0
CARES Act, Paycheck Protection Program Loans
Financing Receivable, Past Due [Line Items]
Number of loans | loan					2,360
Restructured loans					$ 1,400,000
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due		2,469	[1]		2,469	[1]			17,992
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due		6,980	[1]		6,980	[1]			5,985
90 Days Past Due
Financing Receivable, Past Due [Line Items]
Past due		2,200	[1],[4]		2,200	[1],[4]			3,757	[5]
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Current		2,806,327	[1]		2,806,327	[1]			3,025,505
Past due		55,776	[1]		55,776	[1]			34,087
Non - performing		55,776	[1]		55,776	[1]			25,356
Total		2,862,103	[1]		2,862,103	[1]		$ 3,416,518	3,059,592
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Current		1,678,314	[1]		1,678,314	[1]			1,466,460
Past due		4,362	[1]		4,362	[1]			14,069
Non - performing		2,626	[1]		2,626	[1]			10,911
Total		1,682,676	[1]		1,682,676	[1]		1,720,833	1,480,529
Commercial | Commercial construction
Financing Receivable, Past Due [Line Items]
Current		451,594	[1]		451,594	[1]			367,204
Past due		1,504	[1]		1,504	[1]			2,856
Non - performing		1,504	[1]		1,504	[1]			737
Total		453,098	[1]		453,098	[1]		375,445	370,060
Commercial | Business banking
Financing Receivable, Past Due [Line Items]
Current		1,248,611	[1]		1,248,611	[1]			830,735
Past due		20,224	[1]		20,224	[1]			16,055
Non - performing		16,475	[1]		16,475	[1]			9,863
Total		1,268,835	[1]		1,268,835	[1]		0	846,790
Commercial | 30 to 59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due		0	[1]		0	[1]			7,749
Commercial | 30 to 59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due		0	[1]		0	[1]			126
Commercial | 30 to 59 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Past due		0	[1]		0	[1]			956
Commercial | 30 to 59 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Past due		839	[1]		839	[1]			5,093
Commercial | 60 to 89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due		0	[1]		0	[1]			71
Commercial | 60 to 89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due		230	[1]		230	[1]			1,589
Commercial | 60 to 89 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Past due		0	[1]		0	[1]			1,163
Commercial | 60 to 89 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Past due		2,910	[1]		2,910	[1]			1,099
Commercial | 90 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Past due		0	[1],[4]		0	[1],[4]			911	[5]
Commercial | 90 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Past due		1,506	[1],[4]		1,506	[1],[4]			1,443	[5]
Commercial | 90 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Past due	[5]								0
Commercial | 90 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Past due		0	[1],[4]		0	[1],[4]			0	[5]
Consumer | Consumer real estate
Financing Receivable, Past Due [Line Items]
Current		1,184,530	[1]		1,184,530	[1]			1,283,591
Past due		17,583	[1]		17,583	[1]			11,616
Non - performing		11,873	[1]		11,873	[1]			6,063
Total		1,202,113	[1]		1,202,113	[1]		1,545,323	1,295,207
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Current		77,420	[1]		77,420	[1]			81,866
Past due		2,313	[1]		2,313	[1]			3,108
Non - performing		1,859	[1]		1,859	[1]			1,127
Total		79,733	[1]		79,733	[1]		$ 79,033	84,974
Consumer | 30 to 59 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Past due		1,429	[1]		1,429	[1]			2,620
Consumer | 30 to 59 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Past due		201	[1]		201	[1]			1,448
Consumer | 60 to 89 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Past due		3,709	[1]		3,709	[1]			1,758
Consumer | 60 to 89 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Past due		131	[1]		131	[1]			305
Consumer | 90 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Past due		572	[1],[4]		572	[1],[4]			1,175	[5]
Consumer | 90 Days Past Due | Other consumer
Financing Receivable, Past Due [Line Items]
Past due		$ 122	[1],[4]		$ 122	[1],[4]			$ 228	[5]
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.
[2]	Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instrument.
[3]	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.
[4]	Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at June 30, 2020.
[5]	Represents acquired loans that were recorded at fair value at the acquisition date and remain performing at December 31, 2019.

Allowance for Credit Losses -_3

Allowance for Credit Losses - Loans on Nonaccrual Status and Loans Past Due 90 Days or More and Still Accruing (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)		Jun. 30, 2020USD ($)
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual			$ 54,057
End of Period Nonaccrual	$ 90,113	[1]	90,113	[1]
Nonaccrual With No Related Allowance	19,507		19,507
Past Due 90+ Days Still Accruing	2,200		2,200
Interest Income Recognized on Nonaccrual(1)	145	[2]	312	[2]
Commercial | Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual			25,356
End of Period Nonaccrual	55,776	[1]	55,776	[1]
Nonaccrual With No Related Allowance	14,889		14,889
Past Due 90+ Days Still Accruing	0		0
Interest Income Recognized on Nonaccrual(1)	3	[2]	12	[2]
Commercial | Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual			10,911
End of Period Nonaccrual	2,626	[1]	2,626	[1]
Nonaccrual With No Related Allowance	0		0
Past Due 90+ Days Still Accruing	1,506		1,506
Interest Income Recognized on Nonaccrual(1)	9	[2]	23	[2]
Commercial | Commercial construction
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual			737
End of Period Nonaccrual	1,504	[1]	1,504	[1]
Nonaccrual With No Related Allowance	1,218		1,218
Past Due 90+ Days Still Accruing	0		0
Interest Income Recognized on Nonaccrual(1)	0	[2]	0	[2]
Commercial | Business banking
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual			9,863
End of Period Nonaccrual	16,475	[1]	16,475	[1]
Nonaccrual With No Related Allowance	3,002		3,002
Past Due 90+ Days Still Accruing	0		0
Interest Income Recognized on Nonaccrual(1)	57	[2]	104	[2]
Consumer | Consumer real estate
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual			6,063
End of Period Nonaccrual	11,873	[1]	11,873	[1]
Nonaccrual With No Related Allowance	398		398
Past Due 90+ Days Still Accruing	572		572
Interest Income Recognized on Nonaccrual(1)	75	[2]	170	[2]
Consumer | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Beginning of Period Nonaccrual			1,127
End of Period Nonaccrual	1,859	[1]	1,859	[1]
Nonaccrual With No Related Allowance	0		0
Past Due 90+ Days Still Accruing	122		122
Interest Income Recognized on Nonaccrual(1)	$ 1	[2]	$ 3	[2]
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.
[2]	Represents only cash payments received and applied to interest on nonaccrual loans.

Allowance for Credit Losses - C

Allowance for Credit Losses - Collateral Dependent Loans by Class of Loan (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	$ 7,548,558	[1]		$ 7,137,152
Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	66,728
Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	4,630
Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	689
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	2,862,103	[1]	$ 3,416,518	3,059,592
Commercial | Commercial real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	55,447
Commercial | Commercial real estate | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	40
Commercial | Commercial real estate | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Commercial real estate | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	1,682,676	[1]	1,720,833	1,480,529
Commercial | Commercial and industrial | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	2,762
Commercial | Commercial and industrial | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	3,694
Commercial | Commercial and industrial | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Commercial and industrial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	453,098	[1]	375,445	370,060
Commercial | Commercial construction | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	5,215
Commercial | Commercial construction | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Commercial construction | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Commercial construction | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	1,268,835	[1]	$ 0	$ 846,790
Commercial | Business banking | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	2,906
Commercial | Business banking | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	896
Commercial | Business banking | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Business banking | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	689
Commercial | Consumer real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	398
Commercial | Consumer real estate | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Consumer real estate | Investment/Cash
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	0
Commercial | Consumer real estate | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Portfolio loans, net of unearned income	$ 0
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.

Allowance for Credit Losses -_4

Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended			12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		$ 96,850	$ 61,409	$ 62,224		$ 60,996	$ 60,996
Provision for credit losses on loans		85,831	2,205	104,262		7,854
Charge-offs		(68,303)	(2,667)	(79,749)		(8,691)
Recoveries		231	532	520		1,320
Net (Charge-offs)/Recoveries		(68,072)	(2,135)	(79,229)		(7,371)
Balance at End of Period		114,609	61,479	$ 114,609		61,479	$ 62,224	$ 60,996
Accounting Standards Update [Extensible List]				us-gaap:AccountingStandardsUpdate201613Member			us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			34,903			33,707	$ 33,707
Provision for credit losses on loans			(1,545)			(470)
Charge-offs			(528)			(529)
Recoveries			6			128
Net (Charge-offs)/Recoveries			(522)			(401)
Balance at End of Period			32,836			32,836		$ 33,707
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			11,996			11,596	11,596
Provision for credit losses on loans			2,575			8,035
Charge-offs			(1,435)			(6,912)
Recoveries			91			508
Net (Charge-offs)/Recoveries			(1,344)			(6,404)
Balance at End of Period			13,227			13,227		11,596
Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			6,757			7,983	7,983
Provision for credit losses on loans			495			(732)
Charge-offs			0			0
Recoveries			2			3
Net (Charge-offs)/Recoveries			2			3
Balance at End of Period			7,254			7,254		7,983
Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			6,178			6,187	6,187
Provision for credit losses on loans			296			302
Charge-offs			(247)			(410)
Recoveries			344			492
Net (Charge-offs)/Recoveries			97			82
Balance at End of Period			6,571			6,571		6,187
Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			1,575			1,523	1,523
Provision for credit losses on loans			384			719
Charge-offs			(457)			(840)
Recoveries			89			189
Net (Charge-offs)/Recoveries			(368)			(651)
Balance at End of Period			$ 1,591			$ 1,591		$ 1,523
Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		42,611		$ 30,577
Provision for credit losses on loans		20,681		28,345
Charge-offs		(5,600)		(6,042)
Recoveries		38		40
Net (Charge-offs)/Recoveries		(5,562)		(6,002)
Balance at End of Period		57,730		57,730			30,577
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		19,870		15,681
Provision for credit losses on loans		60,906		67,104
Charge-offs		(61,616)		(71,496)
Recoveries		4		22
Net (Charge-offs)/Recoveries		(61,612)		(71,474)
Balance at End of Period		19,164		19,164			15,681
Commercial | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		6,606		7,900
Provision for credit losses on loans		2,249		4,329
Charge-offs		0		0
Recoveries		19		21
Net (Charge-offs)/Recoveries		19		21
Balance at End of Period		8,874		8,874			7,900
Commercial | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		13,706		0	[1]
Provision for credit losses on loans		918		2,126	[1]
Charge-offs		(260)		(721)	[1]
Recoveries		40		101	[1]
Net (Charge-offs)/Recoveries		(220)		(620)	[1]
Balance at End of Period	[1]	14,404		14,404			0
Consumer | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		11,200		6,337
Provision for credit losses on loans		400		829
Charge-offs		(37)		(218)
Recoveries		22		112
Net (Charge-offs)/Recoveries		(15)		(106)
Balance at End of Period		11,585		11,585			6,337
Consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		2,857		1,729
Provision for credit losses on loans		677		1,529
Charge-offs		(790)		(1,272)
Recoveries		108		224
Net (Charge-offs)/Recoveries		(682)		(1,048)
Balance at End of Period		$ 2,852		2,852			1,729
Impact of ASU 2016-13 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				27,352
Balance at End of Period							27,352
Impact of ASU 2016-13 Adoption | Commercial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				4,810
Balance at End of Period							4,810
Impact of ASU 2016-13 Adoption | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				7,853
Balance at End of Period							7,853
Impact of ASU 2016-13 Adoption | Commercial | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				(3,376)
Balance at End of Period							(3,376)
Impact of ASU 2016-13 Adoption | Commercial | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				12,898
Balance at End of Period							12,898
Impact of ASU 2016-13 Adoption | Consumer | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				4,525
Balance at End of Period							4,525
Impact of ASU 2016-13 Adoption | Consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 642
Balance at End of Period							$ 642
[1]	In connection with our adoption of ASU 2016-13, we made changes to our loan portfolio segments to align with the methodology applied in determining the allowance under CECL. Our new segmentation breaks out business banking loans from our other loan segments: CRE, C&I, commercial construction, consumer real estate and other consumer. The business banking allowance balance at the beginning of period is included in the other segments and reclassified to business banking through the impact of CECL adoption line.

Allowance for Credit Losses -_5

Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended			12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Jan. 01, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounting Standards Update [Extensible List]				us-gaap:AccountingStandardsUpdate201613Member			us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Adjustment to allowance for credit loss		$ 114,609	$ 61,479	$ 114,609		$ 61,479	$ 62,224	$ 60,996	$ 96,850	$ 62,224	$ 61,409
Charge-offs		68,303	2,667	79,749		8,691
Total loans										7,074,928
Restructured loans	[1],[2]	1,304	6,427	$ 7,853		11,248
Forecast period				2 years
Nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Restructured loans				$ 31,755	[3]		8,912
Impact of ASU 2016-13 Adoption
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss							27,352			27,353
Total loans										(27,353)
S&T Legacy Loans | Impact of ASU 2016-13 Adoption
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss										8,200
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss			13,227			13,227		$ 11,596			$ 11,996
Charge-offs			1,435			6,912
Restructured loans	[1]	102	$ 0	2,170		$ 4,529
Commercial and industrial | Nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Restructured loans				2,068			$ 695
Commercial and industrial | Impact of ASU 2016-13 Adoption
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss										9,900
Customer fraud, check kiting
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge-offs		58,700
Customer fraud
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge-offs		4,200
Total loans		15,100		15,100
Customer fraud | Nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Restructured loans				10,900
CARES Act, Paycheck Protection Program Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans		547,600		547,600
Restructured loans				1,400,000
ACL provision, COVID-19 assessment		14,400		29,300
ACL provision, COVID-19 assessment, revised forecast		14,800		26,000
Increase (decrease) in ACL provision, COVID-19 assessment, changes in current conditions		(400)		3,300
Customer fraud, commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans		14,300		14,300
Customer fraud, line of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans		$ 800		$ 800
DNB | Impact of ASU 2016-13 Adoption
Financing Receivable, Allowance for Credit Loss [Line Items]
Adjustment to allowance for credit loss										$ 9,300
[1]	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.
[2]	Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instrument.
[3]	Refer to Note 1, Basis of Presentation for details of reclassification of our portfolio segments related to the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.

Allowance for Credit Losses - R

Allowance for Credit Losses - Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings (Details) - Commercial $ in Thousands	Dec. 31, 2019USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 5,512,796
Total percentage of recorded investment in commercial loan	100.00%
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 5,254,076
Total percentage of recorded investment in commercial loan	95.30%
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 103,878
Total percentage of recorded investment in commercial loan	1.90%
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 152,651
Total percentage of recorded investment in commercial loan	2.80%
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 2,191
Total percentage of recorded investment in commercial loan	0.00%
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 3,416,518
Total percentage of recorded investment in commercial loan	100.00%
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 3,270,437
Total percentage of recorded investment in commercial loan	95.70%
Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 57,285
Total percentage of recorded investment in commercial loan	1.70%
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 86,772
Total percentage of recorded investment in commercial loan	2.50%
Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 2,023
Total percentage of recorded investment in commercial loan	0.00%
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 1,720,833
Total percentage of recorded investment in commercial loan	100.00%
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 1,636,314
Total percentage of recorded investment in commercial loan	93.40%
Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 36,484
Total percentage of recorded investment in commercial loan	1.70%
Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 47,980
Total percentage of recorded investment in commercial loan	4.90%
Commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 55
Total percentage of recorded investment in commercial loan	0.00%
Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 375,445
Total percentage of recorded investment in commercial loan	100.00%
Commercial construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 347,324
Total percentage of recorded investment in commercial loan	92.50%
Commercial construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 10,109
Total percentage of recorded investment in commercial loan	2.70%
Commercial construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 17,899
Total percentage of recorded investment in commercial loan	4.80%
Commercial construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 133
Total percentage of recorded investment in commercial loan	0.00%

Allowance for Credit Losses -_6

Allowance for Credit Losses - Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status (Details) - Consumer $ in Thousands	Dec. 31, 2019USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 1,624,356
Percentage of Total	100.00%
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 1,614,158
Percentage of Total	99.40%
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 10,198
Percentage of Total	0.60%
Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 998,585
Percentage of Total	100.00%
Residential Mortgage | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 991,066
Percentage of Total	99.20%
Residential Mortgage | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 7,519
Percentage of Total	0.80%
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 538,348
Percentage of Total	100.00%
Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 535,709
Percentage of Total	99.50%
Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 2,639
Percentage of Total	0.50%
Installment and other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 79,033
Percentage of Total	100.00%
Installment and other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 78,993
Percentage of Total	99.90%
Installment and other consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 40
Percentage of Total	0.10%
Consumer construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 8,390
Percentage of Total	100.00%
Consumer construction | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 8,390
Percentage of Total	100.00%
Consumer construction | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 0
Percentage of Total	0.00%

Allowance for Credit Losses - I

Allowance for Credit Losses - Investments in Loans Considered to be Impaired and Related Information on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment			$ 23,510
With a related allowance recorded, Unpaid Principal Balance			24,821
Impaired financing receivable, Related Allowance			2,200
Without a related allowance recorded, Recorded Investment			51,827
Without a related allowance, Unpaid Principal Balance			61,950
Impaired Financing Receivable, Recorded Investment, Total			75,337
Impaired Financing Receivable, Total Unpaid Principal Balance, Total			86,771
With a related allowance recorded, Average Recorded Investment	$ 9,632	$ 9,649
With a related allowance recorded, Interest Income Recognized	13	27
Without a related allowance recorded, Average Recorded Investment	39,644	37,724
Without a related allowance recorded, Interest Income Recognized	349	584
Impaired financing receivable, Average Recorded Investment, Total	49,276	47,373
Impaired financing Receivable, Interest Income Recognized, Total	362	611
Commercial real estate
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment			13,011
With a related allowance recorded, Unpaid Principal Balance			14,322
Impaired financing receivable, Related Allowance			2,023
Without a related allowance recorded, Recorded Investment			34,909
Without a related allowance, Unpaid Principal Balance			40,201
Impaired Financing Receivable, Recorded Investment, Total			47,920
Impaired Financing Receivable, Total Unpaid Principal Balance, Total			54,523
With a related allowance recorded, Average Recorded Investment	7,703	7,704
With a related allowance recorded, Interest Income Recognized	0	0
Without a related allowance recorded, Average Recorded Investment	21,802	22,093
Without a related allowance recorded, Interest Income Recognized	77	124
Impaired financing receivable, Average Recorded Investment, Total	29,505	29,797
Impaired financing Receivable, Interest Income Recognized, Total	77	124
Commercial and industrial
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment			10,001
With a related allowance recorded, Unpaid Principal Balance			10,001
Impaired financing receivable, Related Allowance			55
Without a related allowance recorded, Recorded Investment			7,605
Without a related allowance, Unpaid Principal Balance			10,358
Impaired Financing Receivable, Recorded Investment, Total			17,606
Impaired Financing Receivable, Total Unpaid Principal Balance, Total			20,359
With a related allowance recorded, Average Recorded Investment	758	772
With a related allowance recorded, Interest Income Recognized	13	26
Without a related allowance recorded, Average Recorded Investment	7,568	5,329
Without a related allowance recorded, Interest Income Recognized	131	189
Impaired financing receivable, Average Recorded Investment, Total	8,326	6,101
Impaired financing Receivable, Interest Income Recognized, Total	144	215
Commercial construction
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment			489
With a related allowance recorded, Unpaid Principal Balance			489
Impaired financing receivable, Related Allowance			113
Without a related allowance recorded, Recorded Investment			1,425
Without a related allowance, Unpaid Principal Balance			2,935
Impaired Financing Receivable, Recorded Investment, Total			1,914
Impaired Financing Receivable, Total Unpaid Principal Balance, Total			3,424
With a related allowance recorded, Average Recorded Investment	489	489
With a related allowance recorded, Interest Income Recognized	0	0
Without a related allowance recorded, Average Recorded Investment	2,319	2,319
Without a related allowance recorded, Interest Income Recognized	48	83
Impaired financing receivable, Average Recorded Investment, Total	2,808	2,808
Impaired financing Receivable, Interest Income Recognized, Total	48	83
Consumer real estate
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment			0
With a related allowance recorded, Unpaid Principal Balance			0
Impaired financing receivable, Related Allowance			0
Without a related allowance recorded, Recorded Investment			7,884
Without a related allowance, Unpaid Principal Balance			8,445
Impaired Financing Receivable, Recorded Investment, Total			7,884
Impaired Financing Receivable, Total Unpaid Principal Balance, Total			8,445
With a related allowance recorded, Average Recorded Investment	666	666
With a related allowance recorded, Interest Income Recognized	0	0
Without a related allowance recorded, Average Recorded Investment	7,952	7,979
Without a related allowance recorded, Interest Income Recognized	93	188
Impaired financing receivable, Average Recorded Investment, Total	8,618	8,645
Impaired financing Receivable, Interest Income Recognized, Total	93	188
Other consumer
Financing Receivable, Impaired [Line Items]
With a related allowance recorded, Recorded Investment			9
With a related allowance recorded, Unpaid Principal Balance			9
Impaired financing receivable, Related Allowance			9
Without a related allowance recorded, Recorded Investment			4
Without a related allowance, Unpaid Principal Balance			11
Impaired Financing Receivable, Recorded Investment, Total			13
Impaired Financing Receivable, Total Unpaid Principal Balance, Total			$ 20
With a related allowance recorded, Average Recorded Investment	16	18
With a related allowance recorded, Interest Income Recognized	0	1
Without a related allowance recorded, Average Recorded Investment	3	4
Without a related allowance recorded, Interest Income Recognized	0	0
Impaired financing receivable, Average Recorded Investment, Total	19	22
Impaired financing Receivable, Interest Income Recognized, Total	$ 0	$ 1

Allowance for Credit Losses - S

Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 96,850	$ 61,409	$ 62,224	$ 60,996
Charge-offs	(68,303)	(2,667)	(79,749)	(8,691)
Recoveries	231	532	520	1,320
Net (Charge-offs)/Recoveries	(68,072)	(2,135)	(79,229)	(7,371)
Provision for credit losses on loans	85,831	2,205	104,262	7,854
Balance at End of Period	$ 114,609	61,479	$ 114,609	61,479
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		34,903		33,707
Charge-offs		(528)		(529)
Recoveries		6		128
Net (Charge-offs)/Recoveries		(522)		(401)
Provision for credit losses on loans		(1,545)		(470)
Balance at End of Period		32,836		32,836
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		11,996		11,596
Charge-offs		(1,435)		(6,912)
Recoveries		91		508
Net (Charge-offs)/Recoveries		(1,344)		(6,404)
Provision for credit losses on loans		2,575		8,035
Balance at End of Period		13,227		13,227
Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		6,757		7,983
Charge-offs		0		0
Recoveries		2		3
Net (Charge-offs)/Recoveries		2		3
Provision for credit losses on loans		495		(732)
Balance at End of Period		7,254		7,254
Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		6,178		6,187
Charge-offs		(247)		(410)
Recoveries		344		492
Net (Charge-offs)/Recoveries		97		82
Provision for credit losses on loans		296		302
Balance at End of Period		6,571		6,571
Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		1,575		1,523
Charge-offs		(457)		(840)
Recoveries		89		189
Net (Charge-offs)/Recoveries		(368)		(651)
Provision for credit losses on loans		384		719
Balance at End of Period		$ 1,591		$ 1,591

Allowance for Credit Losses -_7

Allowance for Credit Losses - Summary of Allowance for Credit Losses and Recorded Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment					$ 2,200
Allowance for Loan Losses, Collectively Evaluated for Impairment					60,024
Total	$ 114,609		$ 96,850	$ 62,224	62,224	$ 61,479	$ 61,409	$ 60,996
Portfolio Loans, Individually Evaluated for Impairment					75,337
Portfolio Loans, Collectively Evaluated for Impairment					7,061,815
Total	$ 7,548,558	[1]			7,137,152
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment					2,023
Allowance for Loan Losses, Collectively Evaluated for Impairment					28,554
Total					30,577
Portfolio Loans, Individually Evaluated for Impairment					47,920
Portfolio Loans, Collectively Evaluated for Impairment					3,368,598
Total					3,416,518
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment					55
Allowance for Loan Losses, Collectively Evaluated for Impairment					15,626
Total					15,681
Portfolio Loans, Individually Evaluated for Impairment					17,606
Portfolio Loans, Collectively Evaluated for Impairment					1,703,227
Total					1,720,833
Commercial construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment					113
Allowance for Loan Losses, Collectively Evaluated for Impairment					7,787
Total					7,900
Portfolio Loans, Individually Evaluated for Impairment					1,914
Portfolio Loans, Collectively Evaluated for Impairment					373,531
Total					375,445
Consumer real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment					0
Allowance for Loan Losses, Collectively Evaluated for Impairment					6,337
Total					6,337
Portfolio Loans, Individually Evaluated for Impairment					7,884
Portfolio Loans, Collectively Evaluated for Impairment					1,537,439
Total					1,545,323
Other consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment					9
Allowance for Loan Losses, Collectively Evaluated for Impairment					1,720
Total					1,729
Portfolio Loans, Individually Evaluated for Impairment					13
Portfolio Loans, Collectively Evaluated for Impairment					79,020
Total					$ 79,033
[1]	We had 2,360 loans that were modified totaling $1.4 billion under the CARES Act at June 30, 2020. These customers were not considered past due as a result of their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Due to the modification program, this delinquency table may not accurately reflect the credit risk associated with these loans.

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Additional Information (Details)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Period for commitments (in days)	60 days

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Assets
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	$ 94,371	$ 25,647
Other Assets | Interest rate swap contracts—commercial loans
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	94,371	25,647
Notional amount, Derivatives (included in Other Assets)	930,074	740,762
Collateral posted, Derivatives (included in Other Assets)	0	0
Other Assets | Interest rate lock commitments—mortgage loans
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	2,583	321
Notional amount, Derivatives (included in Other Assets)	59,677	9,829
Other Assets | Forward sale contracts—mortgage loans
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	0	1
Notional amount, Derivatives (included in Other Assets)	0	12,750
Other Liabilities
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	94,286	25,615
Other Liabilities | Interest rate swap contracts—commercial loans
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	94,286	25,615
Notional amount, Derivatives (included in Other Liabilities)	930,074	740,762
Collateral posted, Derivatives (included in Other Liabilities)	91,730	26,127
Other Liabilities | Interest rate lock commitments—mortgage loans
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	0	0
Notional amount, Derivatives (included in Other Liabilities)	0	0
Other Liabilities | Forward sale contracts—mortgage loans
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)	594	0
Notional amount, Derivatives (included in Other Liabilities)	$ 62,617	$ 0

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Other Assets
Derivatives (included in Other Assets)
Gross amounts recognized		$ 98,649	$ 26,146
Gross amounts offset		(4,278)	(499)
Net Amounts Presented in the Consolidated Balance Sheets		94,371	25,647
Gross amounts not offset	[1]	0	0
Net Amount		94,371	25,647
Other Liabilities
Derivatives (included in Other Liabilities)
Gross amounts recognized		98,564	26,114
Gross amounts offset		(4,278)	(499)
Net Amounts Presented in the Consolidated Balance Sheets		94,286	25,615
Gross amounts not offset	[1]	(91,730)	(26,127)
Net Amount		$ 2,556	$ (512)
[1]	Amounts represent collateral posted for the periods presented.

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain/(Loss)	$ 822	$ 143	$ 2,249	$ 142
Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain/(Loss)	(62)	26	52	(96)
Interest rate lock commitments—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain/(Loss)	186	310	2,792	398
Forward sale contracts—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain/(Loss)	$ 698	$ (193)	$ (595)	$ (160)

Borrowings - Additional Informa

Borrowings - Additional Information (Details)	Jun. 30, 2020USD ($)numberOfPrivatePlacements	Dec. 31, 2019USD ($)
Long Term And Short Term Debt [Line Items]
Total long-term debt outstanding at a fixed rate	$ 2,900,000
Total long-term debt outstanding at a variable rate	$ 45,100,000
Number of completed private placements of trust preferred securities | numberOfPrivatePlacements	3
Percentage of equity owned	100.00%
Federal Home Loan Bank Advance
Long Term And Short Term Debt [Line Items]
Total borrowings	$ 132,500,000	$ 532,900,000
Short-term borrowings	84,500,000
Long-term borrowings	48,000,000
Maximum borrowing capacity	3,100,000,000
Borrowing capacity utilized	383,900,000
Letter of credit to collateralize public funds	251,400,000
Remaining borrowing capacity	2,700,000,000
Mortgage Backed Securities
Long Term And Short Term Debt [Line Items]
Amortized cost of securities pledged as collateral	92,300,000	22,700,000
Carrying value of securities pledged as collateral	$ 97,000,000	$ 23,000,000

Borrowings - Summary of Informa

Borrowings - Summary of Information Pertaining to Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 176,700	$ 301,207
Long-term borrowings, Balance	113,542	115,145
Total Borrowings, Balance	$ 290,242	$ 416,352
Short-term borrowings, Weighted Average Rate	0.31%	1.76%
Long-term borrowings, Weighted Average Rate	2.95%	3.15%
Total Borrowings, Weighted Average Rate	1.34%	2.14%
Securities sold under repurchase agreements
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 92,159	$ 19,888
Short-term borrowings, Weighted Average Rate	0.25%	0.74%
Short-term borrowings
Long Term And Short Term Debt [Line Items]
Short-term borrowings, Balance	$ 84,541	$ 281,319
Short-term borrowings, Weighted Average Rate	0.38%	1.84%
Long-term borrowings
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 49,489	$ 50,868
Long-term borrowings, Weighted Average Rate	2.48%	2.60%
Junior subordinated debt securities
Long Term And Short Term Debt [Line Items]
Long-term borrowings, Balance	$ 64,053	$ 64,277
Long-term borrowings, Weighted Average Rate	3.31%	3.59%

Commitments and Contingencies -

Commitments and Contingencies - Commitments and Letters of Credit (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Other Commitments [Line Items]
Commitments and letters of credit	$ 2,310,008	$ 1,990,845
Commitments to extend credit
Other Commitments [Line Items]
Commitments and letters of credit	2,227,102	1,910,805
Standby letters of credit
Other Commitments [Line Items]
Commitments and letters of credit	$ 82,906	$ 80,040

Commitments and Contingencies_2

Commitments and Contingencies - Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Other Commitments [Line Items]
Balance at beginning of period	$ 6,077	$ 3,112
Impact of adopting ASU 2016-13	7,004	3,112	$ 3,112		$ 3,113
Provision for credit losses	927	2,543
Balance at end of period	$ 7,004	$ 7,004	$ 3,112
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Impact of ASU 2016-13 Adoption
Other Commitments [Line Items]
Balance at beginning of period		$ 1,349
Impact of adopting ASU 2016-13		1,349	$ 1,349		1,349
Balance at end of period			1,349
As Reported Under ASU 2016-13
Other Commitments [Line Items]
Balance at beginning of period		4,461
Impact of adopting ASU 2016-13		$ 4,461	4,461		$ 4,462
Balance at end of period			$ 4,461

Revenue From Contracts With C_3

Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	$ 2,342	$ 3,212	$ 5,900	$ 6,365
Service charges on deposit accounts | Over a period of time
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	440	451	924	908
Service charges on deposit accounts | At a point in time
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1,902	2,761	4,976	5,457
Debit and credit card
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	3,612	3,501	7,093	6,476
Debit and credit card | Over a period of time
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	184	177	378	362
Debit and credit card | At a point in time
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	3,428	3,324	6,715	6,114
Wealth management
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	2,586	2,062	4,949	4,109
Wealth management | Over a period of time
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	652	409	997	822
Wealth management | At a point in time
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	1,934	1,653	3,952	3,287
Other fee revenue | At a point in time
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	$ 874	$ 1,145	$ 1,793	$ 2,064

Other Comprehensive Income_(L_3

Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount		$ 4,523	$ 9,420	$ 26,552	$ 17,271
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit		(963)	(2,008)	(5,650)	(3,683)
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount		3,560	7,412	20,902	13,588
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale		4,201	8,968	25,765	16,366
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	[1]	(142)	0	(142)	0
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on debt securities available-for-sale		(894)	(1,912)	(5,482)	(3,490)
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	[1]	30	0	30	0
Net of Tax Amount
Change in net unrealized gains/(losses) on debt securities available-for-sale		3,307	7,056	20,283	12,876
Reclassification adjustment for net (gains)/losses on debt securities available-for-sale included in net income	[1]	(112)	0	(112)	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other Comprehensive Income/(Loss), Pre-Tax Amount		464	452	929	905
Tax (Expense) Benefit
Other Comprehensive Income/(Loss), Tax (Expense) Benefit		(99)	(96)	(198)	(193)
Net of Tax Amount
Other Comprehensive Income/(Loss), Net of Tax Amount		$ 365	$ 356	$ 731	$ 712
[1]	Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses have been reclassified out of accumulated other comprehensive income/(loss) and have affected certain lines in the Consolidated Statements of Comprehensive (Loss) Income as follows: the pre-tax amount is included in net gain on sale of securities, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

Employee Benefits - Additional

Employee Benefits - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service costs included in net periodic pension expense	$ 0
Expected long-term rate of return on plan assets	3.45%	4.80%
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as a percentage)	90.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation (as a percentage)	10.00%

Employee Benefits - Components

Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components of Net Periodic Pension Cost
Interest cost on projected benefit obligation	$ 890	$ 989	$ 1,781	$ 1,978
Expected return on plan assets	(971)	(1,181)	(1,943)	(2,361)
Net amortization	385	395	769	789
Net Periodic Pension Expense	$ 304	$ 203	$ 607	$ 406

Qualified Affordable Housing (D

Qualified Affordable Housing (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Sep. 11, 2019
Schedule of Equity Method Investments [Line Items]
Investment in qualified affordable housing projects	$ 7,400,000		$ 7,400,000			$ 4,800,000
Tax credits to offset amortization expense of investments in affordable housing projects	600,000	$ 700,000	1,100,000	$ 1,500,000
New Qualified Affordable Housing Project
Schedule of Equity Method Investments [Line Items]
Investment in qualified affordable housing projects	5,100,000		5,100,000
New qualified affordable housing project commitment							$ 10,200,000
Forecast | New Qualified Affordable Housing Project
Schedule of Equity Method Investments [Line Items]
Amortization expense of investments in qualified affordable housing projects					$ 0
Tax credits to offset amortization expense of investments in affordable housing projects					$ 0
Noninterest Expense
Schedule of Equity Method Investments [Line Items]
Amortization expense of investments in qualified affordable housing projects	$ 500,000	$ 700,000	$ 1,100,000	$ 1,400,000

Share Repurchase Plan (Details)

Share Repurchase Plan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 16, 2019
Equity, Class of Treasury Stock [Line Items]
Repurchased common shares (in shares)		71,936	411,430	385,840
Cost to repurchase common shares		$ 2,835,000	$ 12,559,000	$ 15,122,000
September 16, 2019 Plan
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 50,000,000
Repurchased common shares (in shares)	0		411,430
Cost to repurchase common shares			$ 12,600,000
Cost to repurchase common shares (in dollars per share)			$ 30.52