Mid Penn Bancorp (MPB) 10-Q 9 Nov 23 2023 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	1-13677
Entity Registrant Name	MID PENN BANCORP, INC.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1666413
Entity Address, Address Line One	2407 Park Drive
Entity Address, City or Town	Harrisburg
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	17110
City Area Code	1.866
Local Phone Number	642.7736
Title of 12(b) Security	Common Stock, $1.00 par value per share
Trading Symbol	MPB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		16,668,569
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000879635
Amendment Flag	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks	$ 52,509	$ 53,368
Interest-bearing balances with other financial institutions	12,739	4,405
Federal funds sold	52,851	3,108
Total cash and cash equivalents	118,099	60,881
Investment securities:
HTM, at amortized cost (fair value $341,006 and $348,505)	401,561	399,494
AFS, at fair value	218,064	237,878
Equity securities available for sale, at fair value	413	430
Loans held for sale, at fair value	4,270	2,475
Loans, net of unearned interest	4,145,657	3,514,119
Less: ACL - Loans	(34,004)	(18,957)
Net loans	4,111,653	3,495,162
Premises and equipment, net	38,849	34,471
Operating lease right of use asset	8,693	8,798
Finance lease right of use asset	2,773	2,907
Cash surrender value of life insurance	54,209	50,674
Restricted investment in bank stocks	13,554	8,315
Accrued interest receivable	24,230	18,405
Deferred income taxes	25,509	13,674
Goodwill	129,752	114,231
Core deposit and other intangibles, net	6,970	7,260
Foreclosed assets held for sale	905	43
Other assets	56,459	42,856
Total Assets	5,215,963	4,497,954
Deposits:
Noninterest-bearing demand	804,785	793,939
Interest-bearing transaction accounts	2,217,885	2,325,847
Time	1,358,946	658,545
Total Deposits	4,381,616	3,778,331
Short-term borrowings	139,000	102,647
Long-term debt	58,992	4,409
Subordinated debt	46,501	56,941
Operating lease liability	9,097	9,725
Accrued interest payable	14,657	2,303
Other liabilities	37,389	31,499
Total Liabilities	4,687,252	3,985,855
Shareholders' Equity:
Common stock, par value $1.00 per share; 40,000,000 shares authorized at September 30, 2023 and 20,000,000 at December 31, 2022; 16,993,069 issued at September 30, 2023 and 16,094,486 at December 31, 2022; 16,580,347 outstanding at September 30, 2023 and 15,886,143 at December 31, 2022	16,993	16,094
Additional paid-in capital	405,341	386,987
Retained earnings	137,199	133,114
Accumulated other comprehensive loss	(21,362)	(19,216)
Treasury stock, at cost; 412,722 shares at September 30, 2023 and 208,343 shares at December 31, 2022	(9,460)	(4,880)
Total Shareholders’ Equity	528,711	512,099
Total Liabilities and Shareholders' Equity	$ 5,215,963	$ 4,497,954

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Investment securities held to maturity, at fair value	$ 341,006	$ 348,505
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	40,000,000	20,000,000
Common stock, issued (in shares)	16,993,069	16,094,486
Common stock, outstanding (in shares)	16,580,347	15,886,143
Treasury stock (in shares)	412,722	208,343

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
INTEREST INCOME
Loans, including fees	$ 58,792	$ 38,484	$ 156,751	$ 107,764
Investment securities:
Taxable	4,106	3,382	11,942	8,168
Tax-exempt	382	392	1,162	1,107
Other interest-bearing balances	86	12	222	33
Federal funds sold	51	736	145	1,786
Total Interest Income	63,417	43,006	170,222	118,858
INTEREST EXPENSE
Deposits	23,559	2,836	53,487	7,149
Short-term borrowings	1,584	0	4,581	0
Long-term and subordinated debt	794	761	2,181	2,453
Total Interest Expense	25,937	3,597	60,249	9,602
Net Interest Income	37,480	39,409	109,973	109,256
Provision for credit losses - loans	1,427	1,550	3,074	3,775
Net Interest Income After Provision for Credit Losses - Loans	36,053	37,859	106,899	105,481
NONINTEREST INCOME
Net gain on sales of SBA loans	85	152	213	262
Earnings from cash surrender value of life insurance	278	250	824	758
Other	1,743	1,518	4,352	4,366
Total Noninterest Income	5,346	5,963	14,891	16,943
NONINTEREST EXPENSE
Salaries and employee benefits	15,259	13,583	44,130	39,167
Software licensing and utilization	2,085	1,804	6,101	5,731
Occupancy, net	1,761	1,634	5,397	5,088
Equipment	1,292	1,121	3,791	3,244
Shares tax	808	920	2,458	2,626
Legal and professional fees	890	528	2,292	1,861
ATM/card processing	641	518	1,666	1,605
Intangible amortization	484	514	1,289	1,516
FDIC Assessment	1,746	254	2,770	1,351
Loss on sale of foreclosed assets, net	(18)	(57)	(144)	(88)
Merger and acquisition	352	0	5,568	0
Post-acquisition restructuring	0	0	2,952	329
Other	4,589	3,896	13,218	11,945
Total Noninterest Expense	29,889	24,715	91,488	74,375
INCOME BEFORE PROVISION FOR INCOME TAXES	11,510	19,107	30,302	48,049
Provision for income taxes	2,274	3,626	5,003	8,962
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 9,236	$ 15,481	$ 25,299	$ 39,087
PER COMMON SHARE DATA:
Basic Earnings Per Common Share (in dollars per share)	$ 0.56	$ 0.97	$ 1.56	$ 2.45
Diluted earnings per common share (in dollars per share)	$ 0.56	$ 0.97	$ 1.56	$ 2.45
Weighted average common shares outstanding (basic)	16,571,825	15,877,592	16,233,006	15,922,945
Weighted average common shares outstanding (diluted)	16,594,999	15,887,871	16,264,722	15,945,274
Fiduciary and wealth management
NONINTEREST INCOME
Non-interest Income	$ 1,296	$ 1,729	$ 3,736	$ 3,986
ATM debit card interchange
NONINTEREST INCOME
Non-interest Income	986	1,078	3,040	3,263
Service charges on deposits
NONINTEREST INCOME
Non-interest Income	509	483	1,458	1,617
Mortgage banking
NONINTEREST INCOME
Non-interest Income	382	536	1,053	1,370
Mortgage hedging
NONINTEREST INCOME
Non-interest Income	$ 67	$ 217	$ 215	$ 1,321

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income		$ 9,236	$ 15,481	$ 25,299	$ 39,087
Other comprehensive loss:
Unrealized (losses) arising during the period on available for sale securities, net of income tax costs	[1]	(4,410)	(9,376)	(5,694)	(19,418)
Unrealized holding losses arising during the period on interest rate derivatives used in cash flow hedges, net of income tax benefit	[1]	859	0	3,568	0
Change in defined benefit plans, net of income tax (cost) benefit	[1],[2]	(6)	11	(8)	138
Reclassification adjustment for settlement losses and other activity related to benefit plans, net of income taxes	[1],[3]	0	(6)	(12)	(8)
Total other comprehensive loss		(3,557)	(9,371)	(2,146)	(19,288)
Total comprehensive income		$ 5,679	$ 6,110	$ 23,153	$ 19,799
[1]The income tax impacts of the components of other comprehensive income are calculated using a 21% statutory tax rate.[2]The change in defined benefit plans consists primarily of unrecognized actuarial (losses) gains on defined benefit plans during the period.[3] The reclassification adjustment for benefit plans includes settlement gains, amortization of prior service costs, and amortization of net gain or loss. Amounts are included in other income on the Consolidated Statements of Income within total noninterest income.

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) arising during period on available for sale securities, income tax (cost) benefit	$ 1,173	$ 2,492	$ 1,514	$ 5,162
Unrealized holding losses arising during the period on interest rate derivatives used in cash flow hedges, income tax benefit	(228)	0	(948)	0
Change in defined benefit plans, expense (benefit)	2	(4)	2	(37)
Reclassification adjustment for settlement losses and other activity related to benefit plans, benefit (expense)	$ 0	$ 2	$ 3	$ 2

Consolidated Statements of Chan

Consolidated Statements of Changes In Shareholders' Equity (Unaudited) - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Balance (in shares) at Dec. 31, 2021					16,056,282
Balance at Dec. 31, 2021		$ 490,076			$ 16,056	$ 384,742	$ 91,043			$ 158	$ (1,923)
Net income		11,354					11,354
Total other comprehensive income (loss), net of taxes		(5,104)								(5,104)
Common stock cash dividends declared - $0.20 per share		(3,191)					(3,191)
Stock issued during period, acquisitions		776				776
Employee Stock Purchase Plan (in shares)					1,710
Employee Stock Purchase Plan		46			$ 2	44
Director Stock Purchase Plan (in shares)					1,377
Director Stock Purchase Plan		36			$ 1	35
Restricted stock activity		168				168
Balance (in shares) at Mar. 31, 2022					16,059,369
Balance at Mar. 31, 2022		494,161			$ 16,059	385,765	99,206			(4,946)	(1,923)
Balance (in shares) at Dec. 31, 2021					16,056,282
Balance at Dec. 31, 2021		490,076			$ 16,056	384,742	91,043			158	(1,923)
Net income		39,087
Total other comprehensive income (loss), net of taxes		(19,288)
Stock issued during period, acquisitions		776
Balance (in shares) at Sep. 30, 2022					16,090,697
Balance at Sep. 30, 2022		499,105			$ 16,091	386,452	120,572			(19,130)	(4,880)
Balance (in shares) at Mar. 31, 2022					16,059,369
Balance at Mar. 31, 2022		494,161			$ 16,059	385,765	99,206			(4,946)	(1,923)
Net income		12,252					12,252
Total other comprehensive income (loss), net of taxes		(4,813)								(4,813)
Common stock cash dividends declared - $0.20 per share		(3,193)					(3,193)
Repurchased stock		(2,957)									(2,957)
Employee Stock Purchase Plan (in shares)					1,899
Employee Stock Purchase Plan		51			$ 2	49
Director Stock Purchase Plan (in shares)					1,589
Director Stock Purchase Plan		43			$ 2	41
Restricted stock activity (in shares)					17,200
Restricted stock activity		291			$ 18	273
Balance (in shares) at Jun. 30, 2022					16,080,057
Balance at Jun. 30, 2022		495,835			$ 16,081	386,128	108,265			(9,759)	(4,880)
Net income		15,481					15,481
Total other comprehensive income (loss), net of taxes		(9,371)								(9,371)
Common stock cash dividends declared - $0.20 per share		(3,174)					(3,174)
Employee Stock Purchase Plan (in shares)					1,486
Employee Stock Purchase Plan		54			$ 1	53
Director Stock Purchase Plan (in shares)					1,927
Director Stock Purchase Plan		43			$ 2	41
Restricted stock activity (in shares)					7,227
Restricted stock activity		237			$ 7	230
Balance (in shares) at Sep. 30, 2022					16,090,697
Balance at Sep. 30, 2022		499,105			$ 16,091	386,452	120,572			(19,130)	(4,880)
Balance (in shares) at Dec. 31, 2022					16,094,486
Balance at Dec. 31, 2022		512,099	$ (11,548)		$ 16,094	386,987	133,114	$ (11,548)		(19,216)	(4,880)
Net income		11,227					11,227
Total other comprehensive income (loss), net of taxes		1,842								1,842
Common stock cash dividends declared - $0.20 per share		(3,176)					(3,176)
Employee Stock Purchase Plan (in shares)					2,217
Employee Stock Purchase Plan		57			$ 2	55
Director Stock Purchase Plan (in shares)					1,651
Director Stock Purchase Plan		43			$ 2	41
Restricted stock activity		249				249
Balance (in shares) at Mar. 31, 2023					16,098,354
Balance at Mar. 31, 2023		510,793			$ 16,098	387,332	129,617			(17,374)	(4,880)
Balance (in shares) at Dec. 31, 2022					16,094,486
Balance at Dec. 31, 2022		512,099	$ (11,548)		$ 16,094	386,987	133,114	$ (11,548)		(19,216)	(4,880)
Net income		25,299
Total other comprehensive income (loss), net of taxes		(2,146)
Balance (in shares) at Sep. 30, 2023					16,993,069
Balance at Sep. 30, 2023		528,711			$ 16,993	405,341	137,199			(21,362)	(9,460)
Balance (in shares) at Mar. 31, 2023					16,098,354
Balance at Mar. 31, 2023		510,793			$ 16,098	387,332	129,617			(17,374)	(4,880)
Net income		4,836					4,836
Total other comprehensive income (loss), net of taxes		(431)								(431)
Common stock cash dividends declared - $0.20 per share		(3,182)					(3,182)
Stock issued during period, acquisitions (in shares)	[2]				849,510
Stock issued during period, acquisitions	[2]	18,095			$ 850	17,245
Repurchased stock		(4,580)									(4,580)
Employee Stock Purchase Plan (in shares)					2,258
Employee Stock Purchase Plan		50			$ 2	48
Director Stock Purchase Plan (in shares)					2,511
Director Stock Purchase Plan		56			$ 3	53
Restricted stock activity (in shares)					27,667
Restricted stock activity		251			$ 27	224
Balance (in shares) at Jun. 30, 2023					16,980,300
Balance at Jun. 30, 2023		525,888			$ 16,980	404,902	131,271			(17,805)	(9,460)
Net income		9,236					9,236
Total other comprehensive income (loss), net of taxes		(3,557)								(3,557)
Common stock cash dividends declared - $0.20 per share		(3,308)					(3,308)
Employee Stock Purchase Plan (in shares)					4,833
Employee Stock Purchase Plan		95			$ 5	90
Director Stock Purchase Plan (in shares)					2,263
Director Stock Purchase Plan		45			$ 2	43
Restricted stock activity (in shares)					5,673
Restricted stock activity		312			$ 6	306
Balance (in shares) at Sep. 30, 2023					16,993,069
Balance at Sep. 30, 2023		$ 528,711			$ 16,993	$ 405,341	$ 137,199			$ (21,362)	$ (9,460)
[1]The Corporation adopted ASU 2016-13 Brunswick Acquisition . See "Note 2 - Business Combinations" to the Consolidated Financial Statements for more information.

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended					12 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Common stock cash dividends declared (in dollars per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20
Accounting Standards Update [Extensible Enumeration]						Accounting Standards Update 2016-13 [Member]

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Operating Activities:
Net Income		$ 25,299	$ 39,087
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses - loans		3,074	3,775
Depreciation		3,645	3,056
Amortization of intangibles		1,289	1,516
Net amortization of security discounts/premiums		363	530
Noncash operating lease expense		1,413	1,255
Amortization of finance lease right of use asset		134	135
Earnings on cash surrender value of life insurance		(824)	(758)
Mortgage loans originated for sale		(86,451)	(116,966)
Proceeds from sales of mortgage loans originated for sale		85,709	123,853
Gain on sale of mortgage loans		(1,053)	(1,370)
SBA loans originated for sale		(4,015)	(5,310)
Proceeds from sales of SBA loans originated for sale		3,802	5,571
Gain on sale of SBA loans		(213)	(262)
Gain on sale of property, plant, and equipment		(59)	(97)
Gain on sale or write-down of foreclosed assets		(144)	(88)
Loss on sale of bank premises and equipment held for sale		0	(114)
Write-off of bank premises and equipment held for sale		0	705
Accretion of subordinated debt		(440)	(417)
Stock compensation expense		812	696
Change in deferred income tax benefit		(1,501)	(23)
Increase accrued interest receivable		(4,654)	(4,533)
Increase in other assets		(621)	(712)
Increase (decrease) in accrued interest payable		10,443	50
Decrease in operating lease liability		(1,936)	(1,654)
Increase (decrease) in other liabilities		2,332	(6,321)
Net Cash Provided By Operating Activities		36,404	41,604
Investing Activities:
Proceeds from the sale of available-for-sale securities		1,751	0
Proceeds from the maturity or call of available-for-sale securities		12,782	9,910
Purchases of available-for-sale securities		0	(213,974)
Proceeds from the maturity or call of held-to-maturity securities		8,145	12,401
Purchases of held-to-maturity securities		0	(85,664)
Stock dividends of FHLB and other bank stock		549	0
(Purchases) reduction of restricted investment in bank stock		(5,788)	4,539
Net cash received from acquisition		1,068	0
Net increase in loans		(318,079)	(218,061)
Purchases of bank premises and equipment		(2,707)	(3,734)
Proceeds from the sale of premises and equipment		59	1,912
Proceeds from the sale of foreclosed assets		644	148
Proceeds from bank-owned life insurance		774	0
Gain on bank-owned life insurance		(125)	0
Net change in investments in tax credits and other partnerships		(5,615)	0
Net Cash Used In Investing Activities		(306,542)	(492,523)
Financing Activities:
Net increase (decrease) in deposits		320,666	(272,420)
Proceeds from long-term debt		25,000	0
Common stock dividends paid		(9,666)	(9,558)
Proceeds from Employee and Director Stock Purchase Plan stock issuance		346	273
Treasury stock purchased		(4,580)	(2,957)
Riverview restricted stock	[1]	0	776
Net change in finance lease liability		(69)	(67)
Net change in short-term borrowings		36,353	0
Long-term debt repayment		(30,694)	(76,702)
Subordinated debt redemption and trust preferred securities		(10,000)	(7,500)
Net Cash Provided by (Used In) Financing Activities		327,356	(368,155)
Net increase (decrease) in cash and cash equivalents		57,218	(819,074)
Cash and cash equivalents, beginning of period		60,881	913,752
Cash and cash equivalents, end of period		118,099	94,678
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest		56,707	9,552
Cash paid for income taxes		4,400	3,500
Supplemental Noncash Disclosures:
Recognition of operating lease right of use assets		1,336	552
Recognition of operating lease liabilities		1,336	552
Obsolete Riverview asset write-off		0	705
Loans transferred to foreclosed assets held for sale		1,362	109
Held-to-maturity securities purchased, not settled		0	0
Fair value of assets acquired in business combinations, excluding cash	[2]	370,919	0
Goodwill recorded	[2]	15,521	0
Liabilities assumed in business combination	[2]	346,288	0
Stock issued in business combination	[2]	$ 18,095	$ 0
[1]Additionally, 2,500 shares of restricted stock were paid out in cash resulting in $776 thousand of cash consideration relating to stock awards.[2]Includes the impact of the Brunswick Acquisition on May 19, 2023. See "Note 2 - Business Combinations" to the Consolidated Financial Statement for additional information.

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) shares
Statement of Cash Flows [Abstract]
Restricted stock shares paid out in cash | shares	2,500
Stock issued during period, acquisitions | $	$ 776

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation For all periods presented, the accompanying consolidated financial statements include the accounts of Mid Penn Bancorp, Inc., its wholly-owned subsidiary, Mid Penn Bank, and four nonbank subsidiaries, MPB Financial Services, LLC, which includes MPB Wealth Management, LLC and MPB Risk Services, LLC, and MPB Launchpad Fund I, LLC. As of September 30, 2023, the accounts and activities of these nonbank subsidiaries were not material to warrant separate disclosure or segment reporting. As a result, Mid Penn has only one reportable segment for financial reporting purposes. All material intercompany accounts and transactions have been eliminated in consolidation. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. Mid Penn believes the information presented is not misleading, and the disclosures are adequate. For comparative purposes, the September 30, 2022 and December 31, 2022 balances have been reclassified, when necessary, to conform to the 2023 presentation. Such reclassifications had no impact on net income or total shareholders’ equity. In the opinion of management, all adjustments necessary for fair presentation of the periods presented have been reflected in the accompanying consolidated financial statements. All such adjustments are of a normal, recurring nature. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the 2022 Annual Report. Mid Penn has evaluated events and transactions occurring subsequent to the balance sheet date of September 30, 2023, for items that should potentially be recognized or disclosed in these consolidated financial statements. The evaluation was conducted through the issuance date of these consolidated financial statements. CECL Adoption and Updated Significant Accounting Policy On January 1, 2023, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments , which replaces the incurred loss methodology, and is referred to as CECL. The measurement of expected credit losses under CECL is applicable to financial assets measured at amortized cost, including loans and HTM debt securities. It also applies to OBS credit exposures (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor in accordance with ASC Topic 842. The Corporation adopted CECL using the modified retrospective method for all financial assets measured at amortized cost, net of investments in leases and OBS credit exposures. Results for reporting periods beginning after January 1, 2023 are presented under CECL, while prior period results are reported in accordance with the previously applicable incurred loss methodology. The Corporation recorded an overall increase of $15.0 million to the ACL on January 1, 2023 as a result of the adoption of CECL. Retained earnings decreased $11.5 million and deferred tax assets increased by $3.1 million. Included in the $15.0 million increase to the ACL was $3.1 million for certain OBS credit exposures that were previously recognized in other liabilities before the adoption of CECL. On January 1, 2023, the Corporation adopted ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures, which eliminates the accounting guidance for troubled debt restructurings in Accounting Standards Codification ("ASC") Subtopic 310-40, Receivables - Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Additionally, ASU 2022-02 requires entities to disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of ASC Subtopic 326-20, Financial Instruments - Credit Losses - Measured at Amortized Cost. See "Note 4 - Loans and Allowance for Credit Losses - Loans" for the new financial statement disclosures applicable under this update. The updates to the significant accounting policies related to CECL are further discussed in "Note 3 - Investment Securities", "Note 4 - Loans and Allowance for Credit Losses - Loans" and "Note 8 - Commitments and Contingencies". All other significant accounting policies used in preparation of the Consolidated Financial Statements are disclosed in the 2022 Annual Report. Those significant accounting policies are unchanged at September 30, 2023. Accounting Standards Pending Adoption ASU No. 2023-02: The FASB issued ASU 2023-02, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method. The amendments in this update permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. A reporting entity may make an accounting policy election to apply the proportional amortization method on a tax-credit-program-by-tax-credit-program basis rather than electing to apply the proportional amortization method at the reporting entity level or to individual investments. The amendments in this update also remove certain guidance for Qualified Affordable Housing Project investments and require the application of the delayed equity contribution guidance to all tax equity investments. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and must be applied on either a modified retrospective or a retrospective basis. Early adoption is permitted in any interim period, however if adopted in an interim period the entity shall adopt the amendments in this update as of the beginning of the fiscal year that includes the interim period. The Corporation does not expect the adoption of ASU No. 2023-02 to have a material impact on its consolidated financial statements. ASU 2023-06: The FASB issued ASU 2023-06, Disclosure Improvements - Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative . ASU 2023-06 amends the ASC to incorporate certain disclosure requirements from SEC Release No. 33-10532 - Disclosure Update and Simplification that was issued in 2018. The effective date for each amendment will be the date on which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited. ASU 2023-06 is not expected to have a significant impact on our financial statements.

Business Combination

Business Combination	9 Months Ended
	Sep. 30, 2023
Business Combinations [Abstract]
Business Combination	Business Combination Brunswick Acquisition On May 19, 2023, Mid Penn completed its acquisition of Brunswick through the merger of Brunswick with and into Mid Penn with Mid Penn being the surviving corporation. In connection with this acquisition, Brunswick Bank, a wholly-owned subsidiary of Brunswick, merged with and into Mid Penn Bank, a wholly-owned subsidiary of Mid Penn. This transaction included the acquisition of 5 branches and extended Mid Penn’s footprint into Middlesex and Monmouth counties in central New Jersey. Mid Penn issued 849,510 shares of its common stock as well as a net cash payment to Brunswick shareholders of $27.6 million, for total consideration of $45.7 million for all outstanding stock and the cancellation of stock options of Brunswick. Mid Penn has recognized total goodwill of $15.5 million, which is calculated as the excess of both the consideration exchanged and liabilities assumed compared to the fair market value of identifiable assets acquired. The fair value of the consideration exchanged related to Mid Penn’s common stock was calculated based upon the closing market price of Mid Penn’s common stock as of May 19, 2023. None of the goodwill recognized is expected to be deductible for income tax purposes. Mid Penn incurred expenses related to the Brunswick Acquisition of $352 thousand for the three months ended September 30, 2023 and $8.5 million for the nine months ended September 30, 2023, which are included in noninterest expense in the Consolidated Statements of Income. Purchased loans and leases that reflect a more-than-insignificant deterioration of credit from origination are considered PCD. Mid Penn considers various factors in connection with the identification of more-than-insignificant deterioration in credit, including but not limited to nonperforming status, delinquency, risk ratings, FICO scores and other qualitative factors that indicate deterioration in credit quality since origination. For PCD loans and leases, the initial estimate of expected credit losses is recognized in the ACL on the date of acquisition using the same methodology as other loans and leases held-for-investment. As part of the Brunswick Acquisition, Mid Penn acquired PCD loans and leases of $18.7 million. Mid Penn established an ACL at acquisition of $355 thousand with a corresponding gross-up to the amortized cost of the PCD loans and leases. The non-credit discount on the PCD loans and leases was $2.1 million and the Day 1 fair value was $16.6 million. The initial provision expense for non-PCD loans associated with the Brunswick Acquisition was $2.0 million. Estimated fair values of the assets acquired and liabilities assumed in the Brunswick Acquisition as of the closing date are as follows: (In thousands) Assets acquired: Cash and cash equivalents $ 21,029 Federal funds sold 7,604 Investment securities 1,825 Loans 324,471 Goodwill 15,521 Core deposit intangible 999 Premises and equipment 5,315 Cash surrender value of life insurance 3,361 Deferred income taxes 6,792 Accrued interest receivable 1,171 Other assets 3,860 Total assets acquired 391,948 Liabilities assumed: Deposits: Noninterest-bearing demand 62,123 Interest-bearing demand 11,767 Money Market 47,362 Savings 14,203 Time 147,164 Long-term debt 60,137 Accrued interest payable 1,911 Other liabilities 1,621 Total liabilities assumed 346,288 Consideration paid $ 45,660 Cash paid $ 27,565 Fair value of common stock issued 18,095 Management has completed its evaluation of fair values of all assets and liabilities shown in the table above and all amounts are considered final. Measurement period adjustments for the three months ending September 30, 2023 were $349 thousand related to securities paydowns received after the acquisition date that relate to the period before the acquisition date, as well as a $6.4 million reclass between noninterest-bearing demand and interest-bearings demand deposits.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2023
Securities Financing Transactions Disclosures [Abstract]
Investment Securities	Investment Securities FASB ASU 2016-13, "Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments," was adopted by Mid Penn on January 1, 2023. ASU 2016-13 introduces the CECL methodology for estimating allowances for credit losses. ASU 2016-13 applies to all financial instruments carried at amortized cost, including HTM securities, and makes targeted improvements to the accounting for credit losses on AFS securities. In order to comply with ASC 326, Mid Penn conducted a review of its investment portfolio and determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero. This zero-credit loss assumption applies to debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. The reasons behind the adoption of the zero-credit loss assumption are as follows: • High credit rating • Long history with no credit losses • Guaranteed by a sovereign entity • Widely recognized as "risk-free rate" • Can print its own currency • Currency is routinely held by central banks, used in international commerce, and commonly viewed as reserve currency • Currently under the U.S. Government conservatorship or receivership Mid Penn will continuously monitor any changes in economic conditions, credit downgrades, changes to explicit or implicit guarantees granted to certain debt issuers, and any other relevant information that would indicate potential credit deterioration and prompt Mid Penn to reconsider its zero-credit loss assumption. At the date of adoption, Mid Penn’s estimated allowance for credit losses on AFS and HTM securities under ASU 2016-13 was deemed immaterial due to the composition of these portfolios. Both portfolios consist primarily of U.S. government agency guaranteed mortgage-backed securities for which the risk of loss is minimal. Therefore, Mid Penn did not recognize a cumulative effect adjustment through retained earnings related to the AFS and HTM securities. AFS Securities ASU 2016-13 makes targeted improvements to the accounting for credit losses on AFS securities. The concept of other-than-temporarily impaired has been replaced with the allowance for credit losses. Unlike HTM securities, AFS securities are evaluated on an individual level and pooling of securities is not allowed. Quarterly, Mid Penn evaluates if any security has a fair value less than its amortized cost. Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Mid Penn performs further analysis as outlined below: • Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies. • The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee. • If Mid Penn determines that a credit loss exists, the credit portion of the allowance will be measured using a DCF analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Mid Penn records will be limited to the amount by which the amortized cost exceeds the fair value. The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by a reputable third-party. At September 30, 2023, the results of the analysis did not identify any securities that violate the credit loss triggers; therefore, no DCF analysis was performed and no credit loss was recognized on any of the securities available for sale. Accrued interest receivable is excluded from the estimate of credit losses for AFS securities. At September 30, 2023, accrued interest receivable totaled $1.0 million for AFS securities and was reported in accrued interest receivable on the accompanying Consolidated Balance Sheet. HTM Securities ASU 2016-13 requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist. Mid Penn uses several levels of segmentation in order to measure expected credit losses: • The portfolio is segmented into agency and non-agency securities. • The non-agency securities are separated into state and political subdivision obligations and corporate debt securities. Each individual segment is categorized by third-party credit ratings. As discussed above, Mid Penn has determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero, which include debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. This assumption will be reviewed and attested to quarterly. At September 30, 2023, Mid Penn’s HTM securities totaled $401.6 million. After applying appropriate probability of default and loss given default assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at September 30, 2023. Accrued interest receivable is excluded from the estimate of credit losses for HTM securities. At September 30, 2023, accrued interest receivable totaled $2.4 million for HTM securities and was reported in accrued interest receivable on the accompanying Consolidated Balance Sheet. At September 30, 2023, Mid Penn had no HTM securities that were past due 30 days or more as to principal or interest payments. Mid Penn had no HTM securities classified as nonaccrual at September 30, 2023. The amortized cost and estimated fair value of investment securities for the periods presented: September 30, 2023 (In thousands) Amortized Gross Gross Unrealized Estimated Available-for-sale U.S. Treasury and U.S. government agencies $ 36,609 $ — $ 1,878 $ 34,731 Mortgage-backed U.S. government agencies 173,060 — 24,416 148,644 State and political subdivision obligations 4,338 — 1,026 3,312 Corporate debt securities 35,729 — 4,352 31,377 Total available-for-sale debt securities 249,736 — 31,672 218,064 Held-to-maturity U.S. Treasury and U.S. government agencies $ 245,771 $ — $ 40,363 $ 205,408 Mortgage-backed U.S. government agencies 45,374 — 7,614 37,760 State and political subdivision obligations 84,942 — 11,330 73,612 Corporate debt securities 25,474 — 1,248 24,226 Total held-to-maturity debt securities 401,561 — 60,555 341,006 Total $ 651,297 $ — $ 92,227 $ 559,070 December 31, 2022 (In thousands) Amortized Gross Gross Unrealized Estimated Available-for-sale U.S. Treasury and U.S. government agencies $ 36,528 $ — $ 1,614 $ 34,914 Mortgage-backed U.S. government agencies 185,993 — 19,078 166,915 State and political subdivision obligations 4,354 — 815 3,539 Corporate debt securities 35,467 — 2,957 32,510 Total available-for-sale debt securities $ 262,342 $ — $ 24,464 $ 237,878 Held-to-maturity U.S. Treasury and U.S. government agencies $ 245,671 $ — $ 34,834 $ 210,837 Mortgage-backed U.S. government agencies 50,710 — 6,676 44,034 State and political subdivision obligations 87,125 — 8,345 78,780 Corporate debt securities 15,988 — 1,134 14,854 Total held-to-maturity debt securities 399,494 — 50,989 348,505 Total $ 661,836 $ — $ 75,453 $ 586,383 Estimated fair values of debt securities are based on quoted market prices, where applicable. If quoted market prices are not available, fair values are based on quoted market prices of instruments of a similar type, credit quality and structure, adjusted for differences between the quoted instruments and the instruments being valued. See "Note 7 - Fair Value Measurement," for additional information. Investment securities having a fair value of $392.6 million at September 30, 2023 and $338.8 million at December 31, 2022 were pledged to secure public deposits, some Trust department deposit accounts, and certain other borrowings. In accordance with legal provisions for alternatives other than pledging of investments, Mid Penn also obtains letters of credit from the FHLB to secure certain public deposits. These FHLB letter of credit commitments totaled $226.0 million as of September 30, 2023 and $189.0 million as of December 31, 2022. The following tables present gross unrealized losses and fair value of debt investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented: (Dollars in thousands) Less Than 12 Months 12 Months or More Total September 30, 2023 Number Estimated Gross Number Estimated Gross Number Estimated Gross Available-for-sale debt securities: U.S. Treasury and U.S. government agencies — $ — $ — 19 $ 34,731 $ 1,878 19 $ 34,731 $ 1,878 Mortgage-backed U.S. government agencies 1 1,455 122 92 147,189 24,294 93 148,644 24,416 State and political subdivision obligations — — — 8 3,312 1,026 8 3,312 1,026 Corporate debt securities — — — 18 31,377 4,352 18 31,377 4,352 Total available-for-sale debt securities 1 $ 1,455 $ 122 137 $ 216,609 $ 31,550 138 $ 218,064 $ 31,672 Held-to-maturity debt securities: U.S. Treasury and U.S. government agencies 4 5,627 858 141 199,781 39,505 145 205,408 40,363 Mortgage-backed U.S. government agencies 2 971 61 62 36,789 7,553 64 37,760 7,614 State and political subdivision obligations 5 1,568 463 194 72,044 10,867 199 73,612 11,330 Corporate debt securities — — — 15 24,226 1,248 15 24,226 1,248 Total held-to-maturity debt securities 11 8,166 1,382 412 332,840 59,173 423 341,006 60,555 Total 12 $ 9,621 $ 1,504 549 $ 549,449 $ 90,723 561 $ 559,070 $ 92,227 (Dollars in thousands) Less Than 12 Months 12 Months or More Total December 31, 2022 Number Estimated Gross Number Estimated Gross Number Estimated Gross Available-for-sale securities: U.S. Treasury and U.S. government agencies 19 $ 34,914 $ 1,614 — $ — $ — 19 $ 34,914 $ 1,614 Mortgage-backed U.S. government agencies 69 131,879 11,876 24 35,036 7,202 93 166,915 19,078 State and political subdivision obligations 6 2,521 671 2 1,018 144 8 3,539 815 Corporate debt securities 12 25,063 2,153 4 4,196 804 16 29,259 2,957 Total available-for-sale securities 106 194,377 16,314 30 40,250 8,150 136 234,627 24,464 Held-to-maturity securities: U.S. Treasury and U.S. government agencies 54 $ 84,946 $ 10,093 91 $ 125,891 $ 24,741 145 $ 210,837 $ 34,834 Mortgage-backed U.S. government agencies 40 13,866 1,071 24 30,168 5,605 64 44,034 6,676 State and political subdivision obligations 185 73,735 7,413 18 4,616 932 203 78,351 8,345 Corporate debt securities 4 5,721 317 5 5,182 817 9 10,903 1,134 Total held to maturity securities 283 178,268 18,894 138 165,857 32,095 421 344,125 50,989 Total 389 $ 372,645 $ 35,208 168 $ 206,107 $ 40,245 557 $ 578,752 $ 75,453 There were no gross realized gains and losses on sales of available-for-sale debt securities for the three and nine months ended September 30, 2023 and 2022. The table below illustrates the contractual maturity of debt investment securities at amortized cost and estimated fair value. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay with or without call or prepayment penalties. (In thousands) Available-for-sale Held-to-maturity September 30, 2023 Amortized Fair Amortized Fair Due in 1 year or less $ 6,995 $ 6,878 $ 8,076 $ 7,960 Due after 1 year but within 5 years 37,872 36,109 94,702 86,955 Due after 5 years but within 10 years 29,472 24,686 209,213 172,101 Due after 10 years 2,337 1,747 44,196 36,230 76,676 69,420 356,187 303,246 Mortgage-backed securities 173,060 148,644 45,374 37,760 $ 249,736 $ 218,064 $ 401,561 $ 341,006

Loans and Allowance for Credit

Loans and Allowance for Credit Losses - Loans	9 Months Ended
	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans and Allowance for Credit Losses - Loans	Loans and Allowance for Credit Losses - Loans Mid Penn adopted the amendments of FASB ASU 2016-13, on January 1, 2023. The amendments of ASU 2016-13 created FASB ASC Topic 326, "Financial Instruments – Credit Losses," which, among other things, replace much of the guidance and disclosures previously provided in FASB ASC Topic 310, "Receivables." The guidance in FASB ASC Topic 326 replaces the incurred loss methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit losses. In accordance with FASB ASC Subtopic 326-20, "Financial Instruments – Credit Losses – Measured at Amortized Cost," Mid Penn has developed an ACL methodology effective January 1, 2023, which replaces its previous allowance for loan losses methodology. See the section captioned "Allowance for Credit Losses, effective January 1, 2023" within this note for additional information regarding Mid Penn’s ACL. Mid Penn adopted FASB ASC Topic 326 using the modified retrospective approach prescribed by the amendments of ASU 2016-13; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation. Loans, net of unearned income, are summarized as follows by portfolio segment: (In thousands) September 30, 2023 December 31, 2022 Commercial real estate (1) $ 2,288,396 $ 2,052,934 Commercial and industrial 648,439 596,042 Construction 462,215 441,246 Residential mortgage (1) 743,533 416,221 Consumer 3,074 7,676 Total loans $ 4,145,657 $ 3,514,119 (1) In accordance with the guidance in FASB ASC Topic 326, Mid Penn redefined its loan portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. As such, $181.9 million of loans were reclassified from Commercial real estate to Residential mortgage upon adoption of CECL on January 1, 2023. Prior periods were not reclassified. Total loans are stated at the amount of unpaid principal, adjusted for net deferred fees and costs. Net deferred loan fees of $3.9 million reduced the carrying value of loans as of September 30, 2023 and December 31, 2022, respectively. Accrued interest receivable is not included in the amortized cost basis of Mid Penn's loans. At September 30, 2023, accrued interest receivable for loans totaled $20.4 million with no related ACL and was reported in other assets on the accompanying Consolidated Balance Sheet. Past Due and Nonaccrual Loans The performance and credit quality of the loan portfolio is also monitored by analyzing the age of the loans receivable as determined by the length of time a recorded payment is past due. The classes of the loan portfolio summarized by the past due status as of September 30, 2023 and December 31, 2022, are summarized as follows: (In thousands) 30-59 60-89 Greater Total Past Current Total Loans Loans September 30, 2023 Commercial real estate $ 8,355 $ — $ 3,006 $ 11,361 $ 2,277,035 $ 2,288,396 $ — Commercial and industrial 232 — 1,533 1,765 646,674 648,439 — Construction 472 — 2,256 2,728 459,487 462,215 — Residential mortgage 4,068 233 1,675 5,976 737,557 743,533 9 Consumer — — 3 3 3,071 3,074 3 Total $ 13,127 $ 233 $ 8,473 $ 21,833 $ 4,123,824 $ 4,145,657 $ 12 (In thousands) 30-59 60-89 Greater Total Past Current Total Loans Loans December 31, 2022 Commercial real estate $ 1,792 $ — $ 1,438 $ 3,230 $ 2,047,167 $ 2,050,397 $ — Commercial and industrial 1,808 3 1,854 3,665 592,377 596,042 654 Construction 2,258 — — 2,258 438,988 441,246 — Residential mortgage 3,826 955 670 5,451 409,630 415,081 — Consumer 44 19 — 63 7,613 7,676 — Loans acquired with credit deterioration: Commercial real estate 78 — 826 904 1,633 2,537 — Commercial and industrial — — — — — — — Construction — — — — — — — Residential mortgage 223 228 241 692 448 1,140 — Consumer — — — — — — — Total $ 10,029 $ 1,205 $ 5,029 $ 16,263 $ 3,497,856 $ 3,514,119 $ 654 Loans are placed on nonaccrual status when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely, generally when the loan becomes 90 days or more past due. Nonaccrual loans by loan portfolio class, including loans acquired with credit deterioration, as of September 30, 2023 and December 31, 2022 are summarized as follows: September 30, 2023 December 31, 2022 Non-accrual Loans Total non-accrual Loans (In thousands) With a Related Allowance Without a Related Allowance Total Commercial real estate $ 461 $ 6,228 $ 6,689 $ 4,864 Commercial and industrial 1,375 181 1,556 1,222 Construction — 2,256 2,256 — Residential mortgage 95 2,862 2,957 1,698 Consumer — — — 411 $ 1,931 $ 11,527 $ 13,458 $ 8,195 The amount of interest income recognized on nonaccrual loans was approximately $551 thousand and $221 thousand during the three months ended September 30, 2023 and 2022, respectively. During the nine months ended September 30, 2023 and 2022, the amount of interest income recognized on nonaccrual loans was approximately $1.0 million and $605 thousand, respectively. Credit Quality Indicators Mid Penn categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, such as current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors. On a minimum of a quarterly basis, Mid Penn analyzes loans individually to classify the loans as to their credit risk. The following table presents risk ratings by loan portfolio segment and origination year, which is the year of origination or renewal. September 30, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized (In thousands) 2023 2022 2021 2020 2019 Prior Total Commercial real estate Pass $ 230,714 $ 555,982 $ 391,929 $ 303,897 $ 188,508 $ 545,699 $ 35,339 $ 2,252,068 Special mention 200 — 210 — — 16,825 190 17,425 Substandard or lower — 5,241 — 3,176 230 10,208 48 18,903 Total commercial real estate 230,914 561,223 392,139 307,073 188,738 572,732 35,577 2,288,396 Gross charge offs — — — — — (16) — (16) Net charge offs — — — — — (16) — (16) Commercial and industrial Pass 110,268 111,429 75,748 31,053 52,412 62,133 192,538 635,581 Special mention — 141 786 — — 2,652 5,055 8,634 Substandard or lower — 150 — — — 1,587 2,487 4,224 Total commercial and industrial 110,268 111,720 76,534 31,053 52,412 66,372 200,080 648,439 Gross charge offs — (100) — (111) — (9) — (220) Net charge offs — (100) — (111) — (9) — (220) Construction Pass 104,753 214,316 84,231 22,267 10,282 6,395 15,441 457,685 Special mention — 573 — 1,700 — — — 2,273 Substandard or lower — — — — — 2,257 — 2,257 Total construction 104,753 214,889 84,231 23,967 10,282 8,652 15,441 462,215 Residential mortgage Performing 129,139 132,888 87,794 93,336 28,454 184,398 84,569 740,578 Non-performing — — 37 226 — 2,692 — 2,955 Total residential mortgage 129,139 132,888 87,831 93,562 28,454 187,090 84,569 743,533 Gross charge offs — — — — — (4) — (4) Current period recoveries — — — — — 37 — 37 Net recoveries — — — — — 33 — 33 Consumer Performing 1,497 810 — — 98 380 289 3,074 Non-performing — — — — — — — — Total consumer 1,497 810 — — 98 380 289 3,074 Gross charge offs (70) — (8) (9) — (30) — (117) Current period recoveries 26 — — — — — — 26 Net charge offs (44) — (8) (9) — (30) — (91) Total Pass $ 445,735 $ 881,727 $ 551,908 $ 357,217 $ 251,202 $ 614,227 $ 243,318 $ 3,345,334 Special mention 200 714 996 1,700 — 19,477 5,245 28,332 Substandard or lower — 5,391 — 3,176 230 14,052 2,535 25,384 Performing 130,636 133,698 87,794 93,336 28,552 184,778 84,858 743,652 Nonperforming — — 37 226 — 2,692 — 2,955 Total $ 576,571 $ 1,021,530 $ 640,735 $ 455,655 $ 279,984 $ 835,226 $ 335,956 $ 4,145,657 Mid Penn had no loans classified as "doubtful" as of September 30, 2023 and December 31, 2022. Collateral-Dependent Loans A financial asset is considered to be collateral-dependent when the debtor is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For all classes of financial assets deemed collateral-dependent, Mid Penn elected the practical expedient to estimate expected credit losses based on the collateral’s fair value less cost to sell. In most cases, Mid Penn records a partial charge-off to reduce the loan’s carrying value to the collateral’s fair value less cost to sell. Substantially all of the collateral supporting collateral-dependent financial assets consists of various types of real estate, including residential properties; commercial properties such as retail centers, office buildings, and lodging; agriculture land; and vacant land. Allowance for Credit Losses, effective January 1, 2023 Mid Penn’s ACL - loans methodology is based upon guidance within FASB ASC Subtopic 326-20, as well as regulatory guidance from the FDIC, its primary federal regulator. The ACL - loans is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Credit quality within the loan portfolio is continuously monitored by management and is reflected within the ACL - loans. The ACL - loans is an estimate of expected losses inherent within Mid Penn’s existing loan portfolio. The ACL - loans is adjusted through the PCL and reduced by the charge off of loan amounts, net of recoveries. The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Mid Penn’s loan portfolio segments. When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations. Determining the appropriateness of the allowance is complex and requires judgement by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the ACL and credit loss expense. Mid Penn estimates the ACL using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts. Mid Penn uses a third-party software application to calculate the quantitative portion of the ACL using a methodology and assumptions specific to each loan pool. The qualitative portion of the allowance is based on general economic conditions and other internal and external factors affecting Mid Penn as a whole, as well as specific loans. Factors considered include the following: lending process, concentrations of credit, and credit quality. The quantitative and qualitative portions of the allowance are added together to determine the total ACL, which reflects management’s expectations of future conditions based on reasonable and supportable forecasts. The methodology for estimating the amount of expected credit losses reported in the ACL has two basic components: a collective, or pooled, component for estimated expected credit losses for pools of loans that share similar risk characteristics, and an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans. In estimating the ACL for the collective component, loans are segregated into loan pools based on loan purpose codes and similar risk characteristics. The commercial real estate and residential mortgage loan portfolio segments include loans for both commercial and residential properties that are secured by real estate. The underwriting process for these loans includes analysis of the financial position and strength of both the borrower and, if applicable, guarantor, experience with similar projects in the past, market demand and prospects for successful completion of the proposed project within the established budget and schedule, values of underlying collateral, availability of permanent financing, maximum loan-to-value ratios, minimum equity requirements, acceptable amortization periods and minimum debt service coverage requirements, based on property type. The borrower’s financial strength and capacity to repay their obligations remain the primary focus of underwriting. Financial strength is evaluated based upon analytical tools that consider historical and projected cash flows and performance, in addition to analysis of the proposed project for income-producing properties. Additional support offered by guarantors is also considered when applicable. Ultimate repayment of these loans is sensitive to interest rate changes, general economic conditions, liquidity and availability of long-term financing. The commercial and industrial loan portfolio segment includes commercial loans made to many types of businesses for various purposes, such as short-term working capital loans that are usually secured by accounts receivable and inventory, equipment and fixed asset purchases that are secured by those assets, and term financing for those within Mid Penn’s geographic markets. Mid Penn’s credit underwriting process for commercial and industrial loans includes analysis of historical and projected cash flows and performance, evaluation of financial strength of both borrowers and guarantors as reflected in current and detailed financial information, and evaluation of underlying collateral to support the credit. The consumer loan portfolio segment is comprised of loans which are underwritten after evaluating a borrower’s capacity, credit and collateral. Several factors are considered when assessing a borrower’s capacity, including the borrower’s employment, income, current debt, assets and level of equity in the property. Credit is assessed using a credit report that provides credit scores and the borrower’s current and past information about their credit history. Loan-to-value and debt-to-income ratios, loan amount and lien position are also considered in assessing whether to originate a loan. These borrowers are particularly susceptible to downturns in economic trends, such as conditions that negatively affect housing prices and demand and levels of unemployment. Mid Penn utilizes a DCF method to estimate the quantitative portion of the allowance for credit losses for loan pools. The DCF is based off of historical losses, including peer data, which is correlated to national unemployment and GDP. The PD and LGD measures are used in conjunction with prepayment data as inputs into the DCF model to calculate the cash flows at the individual loan level. Contractual cash flows based on loan terms are adjusted for PD, LGD and prepayments to derive loss cash flows. These loss cash flows are discounted by the loan’s coupon rate to arrive at the discounted cash flow based quantitative loss. The prepayment studies are updated quarterly by a third-party for each applicable pool. Mid Penn determined that reasonable and supportable forecasts could be made for a twelve-month period for all of its loan pools. To the extent the lives of the loans in the LHFI portfolio extend beyond this forecast period, Mid Penn uses a reversion period of four quarters and reverts to the historical mean on a straight-line basis over the remaining life of the loans. Qualitative factors used in the ACL methodology include the following: • Lending process • Concentrations of credit The ACL for individual loans, such as non-accrual and PCD, that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based on the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value. The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans. A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral. The expected credit loss for collateral-dependent loans is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral, adjusted for the estimated cost to sell. Fair value estimates for collateral-dependent loans are derived from appraised values based on the current market value or the "as is" value of the collateral, normally from recently received and reviewed appraisals. Current appraisals are ordered on a regular basis based on the inspection date or more often if market conditions necessitate. Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property. These appraisals are reviewed by Mid Penn’s Appraisal Review Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal. If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off. Mid Penn may also purchase loans or acquire loans through a business combination. At the purchase or acquisition date, loans are evaluated to determine whether there has been more than insignificant credit deterioration since origination. Loans that have experienced more than insignificant credit deterioration since origination are referred to as PCD loans. In its evaluation of whether a loan has experienced more than insignificant deterioration in credit quality since origination, Mid Penn takes into consideration loan grades, past due and nonaccrual status. Mid Penn may also consider external credit rating agency ratings for borrowers and for non-commercial loans, FICO score or band, probability of default levels, and number of times past due. At the purchase or acquisition date, the amortized cost basis of PCD loans is equal to the purchase price and an initial estimate of credit losses. The initial recognition of expected credit losses on PCD loans has no impact on net income. When the initial measurement of expected credit losses on PCD loans is calculated on a pooled loan basis, the expected credit losses are allocated to each loan within the pool. Any difference between the initial amortized cost basis and the unpaid principal balance of the loan represents a noncredit discount or premium, which is accreted (or amortized) into interest income over the life of the loan. Subsequent changes to the ACL on PCD loans are recorded through the PCL. For purchased loans that are not deemed to have experienced more than insignificant credit deterioration since origination and are therefore not deemed PCD, any discounts or premiums included in the purchase price are accreted (or amortized) over the contractual life of the individual loan. Loans are charged off against the ACL, with any subsequent recoveries credited back to the ACL account. Expected recoveries may not exceed the aggregate of amounts previously charged off and expected to be charged off. The following table presents the activity in the ACL - loans by portfolio segment for the three and nine months ended September 30, 2023: (In thousands) Commercial real estate Commercial and industrial Construction Residential mortgage Consumer Total Balance at June 30, 2023 $ 14,197 $ 11,403 $ 3,667 $ 3,145 $ 176 $ 32,588 Purchase credit deteriorated loans — — — — — — Loans charged off — — — — (33) (33) Recoveries — — — 7 15 22 Net loans (charged off) recovered — — — 7 (18) (11) Provision for credit losses (1) 4,483 (4,072) 2,211 (1,060) (135) 1,427 Balance at September 30, 2023 $ 18,680 $ 7,331 $ 5,878 $ 2,092 $ 23 $ 34,004 (In thousands) Commercial real estate Commercial and industrial Construction Residential mortgage Consumer Unallocated Total Balance at December 31, 2022 $ 13,142 $ 4,593 $ — $ 1,319 $ 29 $ (126) $ 18,957 Impact of adopting CECL 288 6,600 3,201 1,562 154 126 11,931 Purchase credit deteriorated loans 314 5 13 4 — — 336 Loans charged off (16) (220) — (4) (117) — (357) Recoveries — — — 37 26 — 63 Net loans (charged off) recovered (16) (220) — 33 (91) — (294) Provision for credit losses (1) 4,952 (3,647) 2,664 (826) (69) — 3,074 Balance at September 30, 2023 $ 18,680 $ 7,331 $ 5,878 $ 2,092 $ 23 $ — $ 34,004 (1) Includes a $2.0 million initial provision for credit losses on non-PCD loans acquired in the Brunswick Acquisition. The following table presents the ACL for loans and the amortized cost basis of the loans by the measurement methodology used as of September 30, 2023: (In thousands) ACL - Loans Loans September 30, 2023 Collectively Evaluated for Credit Loss Individually Evaluated for Credit Loss Total ACL - Loans Collectively Evaluated for Credit Loss Individually Evaluated for Credit Loss Total Loans Commercial Real Estate $ 18,300 $ 380 $ 18,680 $ 2,281,707 $ 6,689 $ 2,288,396 Commercial & Industrial 6,623 708 7,331 646,883 1,556 648,439 Construction 5,878 — 5,878 459,959 2,256 462,215 Residential Mortgage 2,090 2 2,092 740,573 2,960 743,533 Consumer 23 — 23 3,074 — 3,074 Total $ 32,914 $ 1,090 $ 34,004 $ 4,132,196 $ 13,461 $ 4,145,657 Allowance for Credit Losses, prior to January 1, 2023 The following table summarizes the allowance and recorded investments in loans receivable: (In thousands) As of, and for the Commercial Real Estate Commercial and industrial Construction Residential mortgage Consumer Unallocated Total Allowance for loan and lease losses: July 1, 2022 $ 11,991 $ 3,671 $ 46 $ 1,143 $ 2 $ 23 $ 16,876 Charge-offs — (1) — (3) (11) — (15) Recoveries 63 — — — 6 — 69 Provisions 468 879 5 162 5 31 1,550 September 30, 2022 12,522 4,549 51 1,302 2 54 18,480 Individually evaluated for impairment 28 831 — 51 — — 910 Collectively evaluated for impairment $ 12,494 $ 3,718 $ 51 $ 1,251 $ 2 $ 54 $ 17,570 (In thousands) As of, and for the Commercial Real Estate Commercial and industrial Construction Residential mortgage Consumer Unallocated Total Allowance for loan and lease losses: January 1, 2022 $ 9,415 $ 3,439 $ 38 $ 1,019 $ 2 $ 684 $ 14,597 Charge-offs — (1) — (3) (77) — (81) Recoveries 128 13 24 4 20 — 189 Provisions 2,979 1,098 (11) 282 57 (630) 3,775 September 30, 2022 12,522 4,549 51 1,302 2 54 18,480 Individually evaluated for impairment 28 831 — 51 — — 910 Collectively evaluated for impairment $ 12,494 $ 3,718 $ 51 $ 1,251 $ 2 $ 54 $ 17,570 Loans Receivable Ending Balance $ 1,944,802 $ 556,796 $ 400,188 $ 412,518 $ 8,153 $ — $ 3,322,457 Individually Evaluated for impairment 713 1,309 — 1,675 — — 3,697 Acquired with credit deterioration 1,364 — 1,222 1,232 — — 3,818 $ 1,942,725 $ 555,487 $ 398,966 $ 409,611 $ 8,153 $ — $ 3,314,942 The information presented in the designated internal risk categories by portfolio segment table presented above is not required for periods prior to the adoption of CECL. The following table presents the most comparable required information for the prior period, internal credit risk ratings, for the indicated loan portfolio segments as of December 31, 2022: (In thousands) Pass Special Substandard Total December 31, 2022 Commercial real estate $ 2,018,088 $ 12,325 $ 22,521 $ 2,052,934 Commercial and industrial 582,540 4,212 9,290 596,042 Construction 438,990 2,256 — 441,246 Residential mortgage 409,259 3,104 3,858 416,221 Consumer 7,676 — — 7,676 Total loans $ 3,456,553 $ 21,897 $ 35,669 $ 3,514,119 Modifications to Borrowers Experiencing Financial Difficulty From time to time, we may modify certain loans to borrowers who are experiencing financial difficulty. In some cases, these modifications may result in new loans. Loan modifications to borrowers experiencing financial difficulty may be in the form of principal forgiveness, an interest rate reduction, an other-than-insignificant payment delay, or a term extension, or a combination thereof, among other things. There were no new modifications for the quarter ending September 30, 2023. Information related to loans modified (by type of modification), whereby the borrower was experiencing financial difficulty at the time of modification, is set forth in the following table: (In thousands) Interest Only Term Extension Combination: Total % of Total Class of Financing Receivable Nine months ended September 30, 2023 Commercial real estate $ 51 $ — $ 180 $ 231 0.01 % Commercial and industrial — 150 — 150 0.02 Total $ 51 $ 150 $ 180 $ 381 0.01 % The financial effects of the interest-only loan modifications reduced the monthly payment amounts for the borrower and the term extensions in the table above added a weighted-average of 2.0 years to the life of the loans, which also reduced the monthly payment amounts for the borrowers.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Mid Penn manages its exposure to certain interest rate risks through the use of derivatives; however, none are entered into for speculative purposes. During the first nine months of 2023, Mid Penn entered into outstanding derivative contracts designated as hedges. As of December 31, 2022, Mid Penn did not designate any derivative financial instruments as formal hedging relationships. Mid Penn’s free-standing derivative financial instruments are required to be carried at their fair value on the Consolidated Balance Sheets. Mortgage Banking Derivative Financial Instruments In connection with its mortgage banking activities, Mid Penn enters into commitments to originate certain fixed-rate residential mortgage loans for customers, also referred to as interest rate locks. In addition, Mid Penn enters into forward commitments for the future sales or purchases of mortgage-backed securities to or from third-party counterparties to hedge the effect of changes in interest rates on the values of both the interest rate locks and mortgage loans held for sale. Forward sales commitments may also be in the form of commitments to sell individual mortgage loans at a fixed price at a future date. The amount necessary to settle each interest rate lock is based on the price that secondary market investors would pay for loans with similar characteristics, including interest rate and term, as of the date fair value is measured. Information related to mortgage banking hedging activity is set forth in the following table: September 30, 2023 December 31, 2022 (In thousands) Notional Amount Asset (Liability) Fair Value Notional Amount Asset (Liability) Fair Value Interest Rate Lock Commitments Positive Fair Values $ 2,233 $ 15 $ 274 $ 3 Negative Fair Values 4,043 (24) 5,252 (40) Forward Commitments Positive Fair Values 4,011 18 4,750 43 Negative Fair Values 3,146 (44) — — For the three months ended September 30, 2023 and 2022, Mid Penn recorded net gains from mortgage banking hedging activity of $67 thousand and $217 thousand, respectively. For the nine months ended September 30, 2023 and 2022, Mid Penn recorded net gains from mortgage banking hedging activity of $215 thousand and $1.3 million, respectively. Loan-level Interest Rate Swaps Mid Penn enters into loan-level interest rate swaps with certain qualifying, creditworthy commercial loan customers to meet their interest rate risk management needs. Mid Penn simultaneously enters into parallel interest rate swaps with dealer counterparties, with identical notional amounts and terms. The net result of the offsetting customer and dealer counterparty swap agreements is that the customer pays a fixed rate of interest and Mid Penn receives a floating rate. Mid Penn’s loan-level interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. Information related to loan level swaps is set forth in the following table: September 30, 2023 December 31, 2022 (Dollars in thousands) Interest rate swaps on loans with customers Notional amount $ 150,769 $ 123,795 Weighted average remaining term (years) 6.84 7.85 Receive fixed rate (weighted average) 4.17 % 3.59 % Pay variable rate (weighted average 7.36 % 6.09 % Estimated fair value $ 14,070 $ 11,697 September 30, 2023 December 31, 2022 (Dollars in thousands) Interest rate swaps on loans with correspondents Notional amount $ 150,769 $ 123,795 Weighted average remaining term (years) 6.84 7.85 Receive variable rate (weighted average) 7.36 % 6.09 % Pay fixed rate (weighted average 4.17 % 3.59 % Estimated fair value $ 14,070 $ 11,697 Cash Flow Hedges of Interest Rate Risk Mid Penn’s objectives in using interest rate derivatives are to reduce volatility in net interest income and to manage its exposure to interest rate movements. To accomplish this objective, Mid Penn primarily uses interest rate swaps as part of its interest rate risk management strategy. During the first nine months of 2023, Mid Penn entered into interest rate swaps designated as cash flow hedges to hedge the cash flows associated with existing brokered CDs. Information related to cash flow hedges is set forth in the following table: September 30, 2023 (Dollars in thousands) Cash flow hedges Notional amount $ 190,000 Weighted average remaining term (years) 2.47 Pay fixed rate (weighted average) 3.74 % Receive variable rate (weighted average 4.78 % Estimated fair value $ 4,914 There were no cash flow hedges at December 31, 2022. For derivatives designated and that qualify as cash flow hedges of interest rate risk, the unrealized gain or loss on the derivative is recorded in AOCI and subsequently reclassified into interest income in the same period during which the hedged transaction affects earnings. Amounts reported in AOCI related to derivatives will be reclassified to interest income as interest payments are made on Mid Penn’s variable-rate liabilities. During the next twelve months, Mid Penn estimates that an additional $2.9 million will be reclassified as a decrease to interest expense.

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	9 Months Ended
	Sep. 30, 2023
Other Income and Expenses [Abstract]
Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income The changes in each component of accumulated other comprehensive loss, net of taxes, are as follows: (I n thousands ) Unrealized Loss on Unrealized Defined Benefit Total Balance at June 30, 2023 $ (20,611) $ 2,709 $ 97 $ (17,805) OCI before reclassifications (4,410) 859 (6) (3,557) Amounts reclassified from AOCI — — — — Balance at September 30, 2023 $ (25,021) $ 3,568 $ 91 (21,362) Balance at December 31, 2022 $ (19,327) $ — $ 111 $ (19,216) OCI before reclassifications (5,694) 3,568 (8) (2,134) Amounts reclassified from AOCI — — (12) (12) Balance at September 30, 2023 $ (25,021) $ 3,568 $ 91 $ (21,362) Balance at June 30, 2022 $ (10,297) $ — $ 538 $ (9,759) OCI before reclassifications (9,376) — 11 (9,365) Amounts reclassified from AOCI — — (6) (6) Balance at September 30, 2022 $ (19,673) $ — $ 543 $ (19,130) Balance at December 31, 2021 $ (255) $ — $ 413 $ 158 OCI before reclassifications (19,418) — 138 (19,280) Amounts reclassified from AOCI — — (8) (8) Balance at September 30, 2022 $ (19,673) $ — $ 543 $ (19,130)

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement The Corporation uses estimates of fair value in applying various accounting standards for its consolidated financial statements on either a recurring or non-recurring basis. Fair value is defined as the price to sell an asset or transfer a liability in an orderly transaction between willing and able market participants. Mid Penn groups its assets and liabilities measured at fair value in three hierarchy levels, based on the observability and transparency of the inputs. The fair value hierarchy is as follows: Level 1 - Inputs that represent quoted prices for identical instruments in active markets. Level 2 - Inputs that represent quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability. Level 3 - Inputs that are largely unobservable, as little or no market data exists for the instrument being valued. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. There were no transfers of assets between fair value Level 1 and Level 2 during the three and nine months ended September 30, 2023 or the year ended December 31, 2022. The following tables illustrate the assets measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets. September 30, 2023 (In thousands) Level 1 Level 2 Level 3 Total Available-for-sale securities: U.S. Treasury and U.S. government agencies $ — $ 34,731 $ — $ 34,731 Mortgage-backed U.S. government agencies — 148,644 — 148,644 State and political subdivision obligations — 3,312 — 3,312 Corporate debt securities — 31,377 — 31,377 Equity securities 413 — — 413 Loans held for sale — 4,270 — 4,270 Other assets: Derivative assets — 18,608 — 18,608 Total $ 413 $ 240,942 $ — $ 241,355 December 31, 2022 (In thousands) Level 1 Level 2 Level 3 Total Available-for-sale securities: U.S. Treasury and U.S. government agencies $ — $ 34,914 $ — $ 34,914 Mortgage-backed U.S. government agencies — 166,915 — 166,915 State and political subdivision obligations — 3,539 — 3,539 Corporate debt securities — 32,510 — 32,510 Equity securities 430 — — 430 Loans held for sale — 2,475 — 2,475 Other assets: Derivative assets — 11,703 — 11,703 Total $ 430 $ 252,056 $ — $ 252,486 The valuation methodologies and assumptions used to estimate the fair value for the items in the preceding tables are as follows: Available for sale investment securities - The fair value of equity and debt securities classified as available for sale is determined by obtaining quoted market prices on nationally recognized securities exchanges (Level 1), or matrix pricing (Level 2), which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted market prices for the specific securities, but rather, relying on the securities’ relationship to other benchmark quoted prices. Equity securities - The fair value of equity securities with readily determinable fair values is recorded on the Consolidated Balance Sheet, with realized and unrealized gains and losses reported in other expense on the Consolidated Statements of Income. Loans held for sale - This category includes mortgage loans held for sale that are measured at fair value. Fair values as of September 30, 2023 were measured as the price that secondary market investors were offering for loans with similar characteristics. Derivative assets - Interest rate swaps are measured by alternative pricing sources with reasonable levels of price transparency in markets that are not active. Based on the complex nature of interest rate swap agreements, the markets these instruments trade in are not as efficient and are less liquid than that of the more mature Level 1 markets. These markets do, however, have comparable, observable inputs in which an alternative pricing source values these assets in order to arrive at a fair market value. These characteristics classify interest rate swap agreements as Level 2. Mortgage banking derivatives represent the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors and the fair value of interest rate swaps. The fair values of Mid Penn’s interest rate locks, forward commitments and interest rate swaps represent the amounts that would be required to settle the derivative financial instruments at the balance sheet date. These characteristics classify interest rate swap agreements as Level 2. See "Note 5 - Derivative Financial Instruments," for additional information. Certain financial assets and financial liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances. The following table illustrates Level 3 financial instruments measured at fair value on a nonrecurring basis: (In thousands) September 30, 2023 December 31, 2022 Individually evaluated loans, net of ACL $ 12,371 $ 4,022 Foreclosed assets held for sale 905 43 Net loans - This category consists of loans that were individually evaluated for credit losses, net of the related ACL, and have been classified as Level 3 assets. In 2022, the amount shown is the balance of individually evaluated loans reporting a specific allocation or that have been partially charged-off. All of these loans are considered collateral-dependent; therefore, all of Mid Penn’s impaired loans, whether reporting a specific allowance allocation or not, are considered collateral- dependent. Mid Penn utilized Level 3 inputs such as independent appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable. Appraisals may be adjusted downward by management for qualitative factors such as economic conditions and estimated liquidation expenses. Foreclosed assets held for sale - Values are based on appraisals that consider the sales prices of property in the proximate vicinity. The following tables summarize the carrying amount, fair value, and placement in the fair value hierarchy of Mid Penn's financial instruments as of the periods presented: September 30, 2023 Carrying Estimated Fair Value (In thousands) Level 1 Level 2 Level 3 Total Financial instruments - assets Cash and cash equivalents $ 118,099 $ 118,099 $ — $ — $ 118,099 Available-for-sale investment securities 218,064 — 218,064 — 218,064 Held-to-maturity investment securities 401,561 — 341,006 — 341,006 Equity securities 413 413 — — 413 Loans held for sale 4,270 — 4,270 — 4,270 Net loans 4,111,653 — — 3,930,893 3,930,893 Restricted investment in bank stocks 13,554 13,554 — — 13,554 Accrued interest receivable 24,230 24,230 — — 24,230 Derivative assets 18,608 — 18,608 — 18,608 Financial instruments - liabilities Deposits $ 4,381,616 $ — $ 3,902,627 $ — $ 3,902,627 Short-term borrowings 139,000 — 139,000 — 139,000 Long-term debt (1) 55,771 — 54,047 — 54,047 Subordinated debt 46,501 — 38,669 — 38,669 Accrued interest payable 14,657 14,657 — — 14,657 Derivative liabilities 14,080 — 14,080 — 14,080 (1) Long-term debt excludes finance lease obligations. December 31, 2022 Estimated Fair Value (In thousands) Carrying Level 1 Level 2 Level 3 Total Financial instruments - assets Cash and cash equivalents $ 60,881 $ 60,881 $ — $ — $ 60,881 Available-for-sale investment securities 237,878 — 237,878 — 237,878 Held-to-maturity investment securities 399,494 — 348,505 — 348,505 Equity securities 430 430 — — 430 Loans held for sale 2,475 — 2,475 — 2,475 Net loans 3,495,162 — — 3,439,948 3,439,948 Restricted investment in bank stocks 8,315 8,315 — — 8,315 Accrued interest receivable 18,405 18,405 — — 18,405 Derivative assets 11,703 — 11,703 — 11,703 Financial instruments - liabilities Deposits $ 3,778,331 $ — $ 3,761,260 $ — $ 3,761,260 Short-term debt 102,647 — 102,647 — 102,647 Long-term debt (1) 1,119 — 1,069 — 1,069 Subordinated debt 56,941 — 55,917 — 55,917 Accrued interest payable 2,303 2,303 — — 2,303 Derivative liabilities 11,737 — 11,737 — 11,737 (1) Long-term debt excludes finance lease obligations. The Bank’s outstanding and unfunded credit commitments and financial standby letters of credit were deemed to have no significant fair value as of September 30, 2023 and December 31, 2022.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Guarantees and commitments to extend credit Mid Penn is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. The commitments include various guarantees and commitments to extend credit. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Mid Penn evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary upon extension of credit, is based on management’s credit evaluation of the customer. Standby letters of credit and financial guarantees written are conditional commitments to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. Mid Penn had $63.8 million and $57.2 million of standby letters of credit outstanding as of September 30, 2023 and December 31, 2022, respectively. Mid Penn does not anticipate any losses because of these transactions. The amount of the liability as of September 30, 2023 and December 31, 2022 for payment under standby letters of credit issued was not considered material. Mid Penn adopted FASB ASC Topic 326, effective January 1, 2023, which requires Mid Penn to estimate expected credit losses for OBS credit exposures which are not unconditionally cancellable. Mid Penn maintains a separate ACL on OBS credit exposures, including unfunded loan commitments and letters of credit, which is included in other liabilities on the accompanying Consolidated Balance Sheets. The ACL - OBS is adjusted as a provision for OBS commitments in noninterest expense. The estimate includes consideration of the likelihood that funding will occur, an estimate of exposure at default that is derived from utilization rate assumptions using a non-modeled approach, and PD and LGD estimates that are derived from the same models and approaches for Mid Penn's other loan portfolio segments described in "Note 4 - Loans and Allowance for Credit Losses - Loans" above, as these unfunded commitments share similar risk characteristics with these loan portfolio segments. The ACL - OBS at September 30, 2023 was $4.5 million compared to $85 thousand at December 31, 2022. On January 1, 2023 in conjunction with adopting ASC 326, Mid Penn recorded an additional $3.1 million of provision for OBS which was included in the adoption cumulative effect adjustment. Provision expense for OBS for the three months ended September 30, 2023 was $661 thousand. Provision expense for OBS for the nine months ended September 30, 2023 was $1.3 million. Low-income housing project commitments Mid Penn Bank has a limited partnership interest in a low-income housing project to construct 39 apartments and common amenities in Cumberland County, Pennsylvania. All of the units are expected to qualify for Federal LIHTC as provided for in Section 42 of the Internal Revenue Code of 1986, as amended. Mid Penn’s limited partner capital contribution commitment is expected to be $10.8 million, which will be paid in installments over the course of construction of the low-income housing facilities. The investment in the limited partnership will be reported in other assets on the balance sheet and amortized over a ten-year period. The project has been conditionally awarded $1.2 million in annual LIHTCs by the Pennsylvania Housing Finance Agency, with a total anticipated LIHTC amount of $12.0 million to be received by Mid Penn over the ten-year amortization period. Mid Penn’s commitment to purchase the limited partnership interest is conditional upon (i) the review and approval of all closing documents, (ii) an opinion letter for tax counsel to the Partnership that the project qualifies for the LIHTCs, and (iii) review and approval by Mid Penn of other documents it may deem necessary. Mid Penn assumed a commitment, as a result of the Riverview Acquisition, to purchase a limited partnership interest in a low-income housing project to preserve and rehabilitate three buildings consisting of 17 apartments and two commercial shops in Schuylkill County, Pennsylvania. All the units are expected to qualify for LIHTCs. Mid Penn’s limited partner capital contribution commitment is expected to be $4.4 million, which will be paid in installments over the course of construction of the low-income housing facilities. The investment in the limited partnership will be reported in other assets on the balance sheet and amortized over a ten-year period. Additionally, the agreement commits Mid Penn to a construction loan in the maximum principal amount of $3.5 million, which will bear interest at 5.5% annum with a term of twenty-four months. The project has been conditionally awarded $484 thousand in annual LIHTCs by the Pennsylvania Housing Finance Agency, with a total anticipated LIHTC amount of $4.8 million to be received by Mid Penn over the ten-year amortization period. Mid Penn’s commitment to purchase the limited partnership interest is conditional upon (i) the review and approval of all closing documents, (ii) an opinion letter for tax counsel to the Partnership that the project qualifies for the LIHTCs, and (iii) review and approval by Mid Penn of other documents it may deem necessary. Litigation Mid Penn is subject to lawsuits and claims arising out of its normal conduct of business. In the opinion of management, after consultation with legal counsel, the ultimate disposition of these matters is not expected to have a material adverse effect on the consolidated financial condition of Mid Penn.

Debt

Debt	9 Months Ended
	Sep. 30, 2023
Maturities of Long-Term Debt [Abstract]
Debt	Debt Short-term FHLB and Correspondent Bank Borrowings Total short-term borrowings were $139.0 million and $102.6 million as of September 30, 2023 and December 31, 2022, respectively. Short-term borrowings generally consist of federal funds purchased and advances from the FHLB with an original maturity of less than a year. Federal funds purchased from correspondent banks mature in one business day and reprice daily based on the Federal Funds rate. Advances from the FHLB are collateralized by the Bank’s investment in the common stock of the FHLB and by a blanket lien on selected loan receivables comprised principally of real estate secured loans within the Bank’s portfolio totaling $1.7 billion at September 30, 2023. The Bank had a short-term borrowing capacity from the FHLB as of September 30, 2023 up to the Bank’s unused borrowing capacity of $1.3 billion (equal to $1.7 billion of maximum borrowing capacity, less the aggregate amount of FHLB letter of credits securing public funds deposits, and other FHLB advances and obligations outstanding) upon satisfaction of any stock purchase requirements of the FHLB. The Bank also has unused overnight lines of credit with other correspondent banks amounting to $35.0 million at September 30, 2023. No draws were made on these lines as of September 30, 2023 and December 31, 2022. Long-term Debt The following table presents a summary of long-term debt as of September 30, 2023 and December 31, 2022. (Dollars in thousands) September 30, 2023 December 31, 2022 FHLB fixed rate instruments: Due January 2024, 1.10% $ 10,000 $ — Due March 2024, 5.60% 25,000 — Due February 2026, 4.51% 20,000 — Due August 2026, 4.80% 745 1,088 Due February 2027, 6.71% 26 31 Total FHLB fixed rate instruments 55,771 1,119 Lease obligations included in long-term debt 3,221 3,290 Total long-term debt $ 58,992 $ 4,409

Subordinated Debt and Trust Pre

Subordinated Debt and Trust Preferred Securities	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Subordinated Debt and Trust Preferred Securities	Subordinated Debt and Trust Preferred Securities Subordinated Debt Issued December 2017 On December 19, 2017, Mid Penn entered into agreements with investors to purchase $10.0 million aggregate principal amount of its subordinated notes due 2028 (the "2017 Notes"). The 2017 Notes were treated as Tier 2 capital for regulatory capital purposes. The 2017 Notes were redeemable in whole or in part, without premium or penalty, at any time on or after December 21, 2022, and prior to January 1, 2028. Mid Penn redeemed the 2017 Notes in whole on April 17, 2023. Subordinated Debt Assumed November 2021 with the Riverview Acquisition On November 30, 2021, Mid Penn completed its acquisition of Riverview and assumed $25.0 million of subordinated notes (the "Riverview Notes"). In accordance with purchase accounting principles, the Riverview Notes were assigned a fair value premium of $2.3 million. The notes are treated as Tier 2 capital for regulatory reporting purposes. The Riverview Notes were entered into by Riverview on October 6, 2020 with certain qualified institutional buyers and accredited institutional investors. The Riverview Notes have a maturity date of October 15, 2030 and initially bear interest, payable semi-annually, at a fixed annual rate of 5.75% per annum until October 15, 2025. Commencing on that date, the interest rate applicable to the outstanding principal amount due will be reset quarterly to an interest rate per annum equal to the then current three-month SOFR plus 563 bps, payable quarterly until maturity. Mid Penn may redeem the Riverview Notes at par, in whole or in part, at its option, anytime beginning on October 15, 2025. Subordinated Debt Issued December 2020 On December 22, 2020, Mid Penn entered into agreements for and sold, at 100% of their principal amount, an aggregate of $12.2 million of its subordinated notes due December 2030 (the "December 2020 Notes") on a private placement basis to accredited investors. The December 2020 Notes are treated as Tier 2 capital for regulatory capital purposes. The December 2020 Notes bear interest at a rate of 4.5% per year for the first five years and then float at the Wall Street Journal’s Prime Rate, provided that the interest rate applicable to the outstanding principal balance during the period the December 2020 Notes are floating will at no time be less than 4.5%. Interest is payable quarterly in arrears on March 31, June 30, September 30 and December 31 of each year, beginning on March 31, 2021. The December 2020 Notes will mature on December 31, 2030 and are redeemable, in whole or in part, without premium or penalty, on any interest payment date on or after December 31, 2025 and prior to December 31, 2030, subject to any required regulatory approvals. Additionally, if (i) all or any portion of the December 2020 Notes cease to be deemed Tier 2 Capital, (ii) interest on the December 2020 Notes fails to be deductible for United States federal income tax purposes, or (iii) Mid Penn will be considered an "investment company," Mid Penn may redeem the December 2020 Notes, in whole but not in part, by giving 10 days’ notice to the holders of the December 2020 Notes. In the event of a redemption described in the previous sentence, Mid Penn will redeem the December 2020 Notes at 100% of the principal amount of the December 2020 Notes, plus accrued and unpaid interest thereon to but excluding the date of redemption. Holders of the December 2020 Notes may not accelerate the maturity of the December 2020 Notes, except upon the bankruptcy, insolvency, liquidation, receivership or similar event of Mid Penn or the Bank. Related parties held $750 thousand of the December 2020 Notes as of September 30, 2023 and December 31, 2022. Subordinated Debt Issued March 2020 On March 20, 2020, Mid Penn entered into agreements with accredited investors who purchased $15.0 million aggregate principal amount of its subordinated notes due March 2030 (the "March 2020 Notes"). As a result of Mid Penn’s merger with Riverview on November 30, 2021, $6.9 million of the March 2020 Notes balance was redeemed as Riverview was a holder of the March 2020 Notes. The balance of March 2020 Notes outstanding as of September 30, 2023 was $8.1 million. The March 2020 Notes are intended to be treated as Tier 2 capital for regulatory capital purposes. The March 2020 Notes bear interest at a rate of 4.0% per year for the first five years and then float at the Wall Street Journal’s Prime Rate, provided that the interest rate applicable to the outstanding principal balance during the period the March 2020 Notes are floating will at no time be less than 4.25%. Interest is payable semi-annually in arrears on June 30 and December 30 of each year, beginning on June 30, 2020, for the first five years after issuance and will be payable quarterly in arrears thereafter on March 30, June 30, September 30 and December 30. The March 2020 Notes will mature on March 30, 2030 and are redeemable in whole or in part, without premium or penalty, at any time on or after March 30, 2025 and prior to March 30, 2030. Additionally, if all or any portion of the March 2020 Notes cease to be deemed Tier 2 Capital, Mid Penn may redeem, on any interest payment date, all or part of the 2020 Notes. In the event of a redemption described in the previous sentence, Mid Penn will redeem the March 2020 Notes at 100% of the principal amount of the March 2020 Notes, plus accrued and unpaid interest thereon to but excluding the date of redemption. Holders of the March 2020 Notes may not accelerate the maturity of the March 2020 Notes, except upon the bankruptcy, insolvency, liquidation, receivership or similar event of Mid Penn or the Bank. Related parties held $1.7 million of the March 2020 Notes as of September 30, 2023 and December 31, 2022.

Common Stock and Earnings Per S

Common Stock and Earnings Per Share	9 Months Ended
	Sep. 30, 2023
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Common Stock and Earnings Per Share	Common Stock and Earnings Per Share Treasury Stock Repurchase Program Mid Penn adopted a treasury stock repurchase program ("Program") initially effective March 19, 2020, and renewed through May 11, 2024 by Mid Penn’s Board of Directors on May 11, 2023. The Program authorizes the repurchase of up to $15.0 million of Mid Penn’s outstanding common stock. Under the Program, Mid Penn conducts repurchases of its common stock through open market transactions (which may be by means of a trading plan adopted under SEC Rule 10b5-1) or in privately negotiated transactions. Repurchases under the Program are made at the discretion of management and are subject to market conditions and other factors. There is no guarantee as to the exact number of shares that Mid Penn may repurchase. The Program is able to be modified, suspended or terminated at any time, at Mid Penn’s discretion, based upon a number of factors, including liquidity, market conditions, the availability of alternative investment opportunities and other factors Mid Penn deems appropriate. The Program does not obligate Mid Penn to repurchase any shares. During the three months ended September 30, 2023, Mid Penn did not repurchase any shares of common stock. As of September 30, 2023, Mid Penn had repurchased 412,722 shares of common stock at an average price of $22.92 per share under the Program. The Program had $5.5 million remaining available for repurchase as of September 30, 2023. Dividend Reinvestment Plan Under Mid Penn’s amended and restated DRIP, 300,000 shares of Mid Penn’s authorized but unissued common stock are reserved for issuance. The DRIP also allows for voluntary cash payments, within specified limits, to be used for the purchase of additional shares. Equity Incentive Plans On May 9, 2023, shareholders approved the 2023 Stock Incentive Plan, which authorizes Mid Penn to grant incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, deferred stock units and performance shares. The 2023 Plan was established for employees and directors of Mid Penn and the Bank, selected by the Compensation Committee of the Board of Directors, to incentivize the further success of the Company, and replaces the 2014 Restricted Stock Plan. The aggregate number of shares of common stock of the Company available for issuance under the Plan is 350,000 shares . As of September 30, 2023, a total of 217,514 restricted shares were granted under the 2014 Plan, of which 88,519 shares were unvested. The 2014 Plan shares granted and vested resulted in $324 thousand and $237 thousand in share-based compensation expense for the three months ended September 30, 2023 and 2022, respectively. For the nine months ended September 30, 2023 and 2022, the 2014 Plan shares granted and vested resulted in share-based compensation expense of $825 thousand and $694 thousand, respectively. Share-based compensation expense relating to restricted stock is calculated using grant date fair value and is recognized on a straight-line basis over the vesting periods of the awards. Restricted shares granted to employees vest in equal amounts on the anniversary of the grant date over the vesting period and the expense is a component of salaries and benefits expense on the Consolidated Statement of Income. The employee grant vesting period is determined by the terms of each respective grant, with vesting periods generally between one The following data shows the amounts used in computing basic and diluted earnings per common share: Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except per share data) 2023 2022 2023 2022 Net income $ 9,236 $ 15,481 $ 25,299 $ 39,087 Weighted average common shares outstanding (basic) 16,571,825 15,877,592 16,233,006 15,922,945 Effect of dilutive unvested restricted stock grants 23,174 10,279 31,716 22,329 Weighted average common shares outstanding (diluted) 16,594,999 15,887,871 16,264,722 15,945,274 Basic earnings per common share $ 0.56 $ 0.97 $ 1.56 $ 2.45 Diluted earnings per common share 0.56 0.97 1.56 2.45 There were no antidilutive instruments at September 30, 2023 and 2022.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
CECL Adoption and Updated Significant Accounting Policy	CECL Adoption and Updated Significant Accounting Policy On January 1, 2023, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments , which replaces the incurred loss methodology, and is referred to as CECL. The measurement of expected credit losses under CECL is applicable to financial assets measured at amortized cost, including loans and HTM debt securities. It also applies to OBS credit exposures (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor in accordance with ASC Topic 842. The Corporation adopted CECL using the modified retrospective method for all financial assets measured at amortized cost, net of investments in leases and OBS credit exposures. Results for reporting periods beginning after January 1, 2023 are presented under CECL, while prior period results are reported in accordance with the previously applicable incurred loss methodology. The Corporation recorded an overall increase of $15.0 million to the ACL on January 1, 2023 as a result of the adoption of CECL. Retained earnings decreased $11.5 million and deferred tax assets increased by $3.1 million. Included in the $15.0 million increase to the ACL was $3.1 million for certain OBS credit exposures that were previously recognized in other liabilities before the adoption of CECL. On January 1, 2023, the Corporation adopted ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures, which eliminates the accounting guidance for troubled debt restructurings in Accounting Standards Codification ("ASC") Subtopic 310-40, Receivables - Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Additionally, ASU 2022-02 requires entities to disclose current-period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of ASC Subtopic 326-20, Financial Instruments - Credit Losses - Measured at Amortized Cost. See "Note 4 - Loans and Allowance for Credit Losses - Loans" for the new financial statement disclosures applicable under this update. The updates to the significant accounting policies related to CECL are further discussed in "Note 3 - Investment Securities", "Note 4 - Loans and Allowance for Credit Losses - Loans" and "Note 8 - Commitments and Contingencies". All other significant accounting policies used in preparation of the Consolidated Financial Statements are disclosed in the 2022 Annual Report. Those significant accounting policies are unchanged at September 30, 2023. Accounting Standards Pending Adoption ASU No. 2023-02: The FASB issued ASU 2023-02, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method. The amendments in this update permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. A reporting entity may make an accounting policy election to apply the proportional amortization method on a tax-credit-program-by-tax-credit-program basis rather than electing to apply the proportional amortization method at the reporting entity level or to individual investments. The amendments in this update also remove certain guidance for Qualified Affordable Housing Project investments and require the application of the delayed equity contribution guidance to all tax equity investments. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and must be applied on either a modified retrospective or a retrospective basis. Early adoption is permitted in any interim period, however if adopted in an interim period the entity shall adopt the amendments in this update as of the beginning of the fiscal year that includes the interim period. The Corporation does not expect the adoption of ASU No. 2023-02 to have a material impact on its consolidated financial statements. ASU 2023-06: The FASB issued ASU 2023-06, Disclosure Improvements - Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative . ASU 2023-06 amends the ASC to incorporate certain disclosure requirements from SEC Release No. 33-10532 - Disclosure Update and Simplification that was issued in 2018. The effective date for each amendment will be the date on which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited. ASU 2023-06 is not expected to have a significant impact on our financial statements.
AFS and HTM Securities	AFS Securities ASU 2016-13 makes targeted improvements to the accounting for credit losses on AFS securities. The concept of other-than-temporarily impaired has been replaced with the allowance for credit losses. Unlike HTM securities, AFS securities are evaluated on an individual level and pooling of securities is not allowed. Quarterly, Mid Penn evaluates if any security has a fair value less than its amortized cost. Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Mid Penn performs further analysis as outlined below: • Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies. • The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee. • If Mid Penn determines that a credit loss exists, the credit portion of the allowance will be measured using a DCF analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Mid Penn records will be limited to the amount by which the amortized cost exceeds the fair value. The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by a reputable third-party. HTM Securities ASU 2016-13 requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist. Mid Penn uses several levels of segmentation in order to measure expected credit losses: • The portfolio is segmented into agency and non-agency securities. • The non-agency securities are separated into state and political subdivision obligations and corporate debt securities. Each individual segment is categorized by third-party credit ratings.
Collateral Dependent Loans	Collateral-Dependent Loans A financial asset is considered to be collateral-dependent when the debtor is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For all classes of financial assets deemed collateral-dependent, Mid Penn elected the practical expedient to estimate expected credit losses based on the collateral’s fair value less cost to sell. In most cases, Mid Penn records a partial charge-off to reduce the loan’s carrying value to the collateral’s fair value less cost to sell. Substantially all of the collateral supporting collateral-dependent financial assets consists of various types of real estate, including residential properties; commercial properties such as retail centers, office buildings, and lodging; agriculture land; and vacant land. Allowance for Credit Losses, effective January 1, 2023 Mid Penn’s ACL - loans methodology is based upon guidance within FASB ASC Subtopic 326-20, as well as regulatory guidance from the FDIC, its primary federal regulator. The ACL - loans is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Credit quality within the loan portfolio is continuously monitored by management and is reflected within the ACL - loans. The ACL - loans is an estimate of expected losses inherent within Mid Penn’s existing loan portfolio. The ACL - loans is adjusted through the PCL and reduced by the charge off of loan amounts, net of recoveries. The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Mid Penn’s loan portfolio segments. When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations. Determining the appropriateness of the allowance is complex and requires judgement by management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the ACL and credit loss expense. Mid Penn estimates the ACL using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts. Mid Penn uses a third-party software application to calculate the quantitative portion of the ACL using a methodology and assumptions specific to each loan pool. The qualitative portion of the allowance is based on general economic conditions and other internal and external factors affecting Mid Penn as a whole, as well as specific loans. Factors considered include the following: lending process, concentrations of credit, and credit quality. The quantitative and qualitative portions of the allowance are added together to determine the total ACL, which reflects management’s expectations of future conditions based on reasonable and supportable forecasts. The methodology for estimating the amount of expected credit losses reported in the ACL has two basic components: a collective, or pooled, component for estimated expected credit losses for pools of loans that share similar risk characteristics, and an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans. In estimating the ACL for the collective component, loans are segregated into loan pools based on loan purpose codes and similar risk characteristics. The commercial real estate and residential mortgage loan portfolio segments include loans for both commercial and residential properties that are secured by real estate. The underwriting process for these loans includes analysis of the financial position and strength of both the borrower and, if applicable, guarantor, experience with similar projects in the past, market demand and prospects for successful completion of the proposed project within the established budget and schedule, values of underlying collateral, availability of permanent financing, maximum loan-to-value ratios, minimum equity requirements, acceptable amortization periods and minimum debt service coverage requirements, based on property type. The borrower’s financial strength and capacity to repay their obligations remain the primary focus of underwriting. Financial strength is evaluated based upon analytical tools that consider historical and projected cash flows and performance, in addition to analysis of the proposed project for income-producing properties. Additional support offered by guarantors is also considered when applicable. Ultimate repayment of these loans is sensitive to interest rate changes, general economic conditions, liquidity and availability of long-term financing. The commercial and industrial loan portfolio segment includes commercial loans made to many types of businesses for various purposes, such as short-term working capital loans that are usually secured by accounts receivable and inventory, equipment and fixed asset purchases that are secured by those assets, and term financing for those within Mid Penn’s geographic markets. Mid Penn’s credit underwriting process for commercial and industrial loans includes analysis of historical and projected cash flows and performance, evaluation of financial strength of both borrowers and guarantors as reflected in current and detailed financial information, and evaluation of underlying collateral to support the credit. The consumer loan portfolio segment is comprised of loans which are underwritten after evaluating a borrower’s capacity, credit and collateral. Several factors are considered when assessing a borrower’s capacity, including the borrower’s employment, income, current debt, assets and level of equity in the property. Credit is assessed using a credit report that provides credit scores and the borrower’s current and past information about their credit history. Loan-to-value and debt-to-income ratios, loan amount and lien position are also considered in assessing whether to originate a loan. These borrowers are particularly susceptible to downturns in economic trends, such as conditions that negatively affect housing prices and demand and levels of unemployment. Mid Penn utilizes a DCF method to estimate the quantitative portion of the allowance for credit losses for loan pools. The DCF is based off of historical losses, including peer data, which is correlated to national unemployment and GDP. The PD and LGD measures are used in conjunction with prepayment data as inputs into the DCF model to calculate the cash flows at the individual loan level. Contractual cash flows based on loan terms are adjusted for PD, LGD and prepayments to derive loss cash flows. These loss cash flows are discounted by the loan’s coupon rate to arrive at the discounted cash flow based quantitative loss. The prepayment studies are updated quarterly by a third-party for each applicable pool. Mid Penn determined that reasonable and supportable forecasts could be made for a twelve-month period for all of its loan pools. To the extent the lives of the loans in the LHFI portfolio extend beyond this forecast period, Mid Penn uses a reversion period of four quarters and reverts to the historical mean on a straight-line basis over the remaining life of the loans. Qualitative factors used in the ACL methodology include the following: • Lending process • Concentrations of credit The ACL for individual loans, such as non-accrual and PCD, that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based on the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value. The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans. A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral. The expected credit loss for collateral-dependent loans is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral, adjusted for the estimated cost to sell. Fair value estimates for collateral-dependent loans are derived from appraised values based on the current market value or the "as is" value of the collateral, normally from recently received and reviewed appraisals. Current appraisals are ordered on a regular basis based on the inspection date or more often if market conditions necessitate. Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property. These appraisals are reviewed by Mid Penn’s Appraisal Review Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal. If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off. Mid Penn may also purchase loans or acquire loans through a business combination. At the purchase or acquisition date, loans are evaluated to determine whether there has been more than insignificant credit deterioration since origination. Loans that have experienced more than insignificant credit deterioration since origination are referred to as PCD loans. In its evaluation of whether a loan has experienced more than insignificant deterioration in credit quality since origination, Mid Penn takes into consideration loan grades, past due and nonaccrual status. Mid Penn may also consider external credit rating agency ratings for borrowers and for non-commercial loans, FICO score or band, probability of default levels, and number of times past due. At the purchase or acquisition date, the amortized cost basis of PCD loans is equal to the purchase price and an initial estimate of credit losses. The initial recognition of expected credit losses on PCD loans has no impact on net income. When the initial measurement of expected credit losses on PCD loans is calculated on a pooled loan basis, the expected credit losses are allocated to each loan within the pool. Any difference between the initial amortized cost basis and the unpaid principal balance of the loan represents a noncredit discount or premium, which is accreted (or amortized) into interest income over the life of the loan. Subsequent changes to the ACL on PCD loans are recorded through the PCL. For purchased loans that are not deemed to have experienced more than insignificant credit deterioration since origination and are therefore not deemed PCD, any discounts or premiums included in the purchase price are accreted (or amortized) over the contractual life of the individual loan. Loans are charged off against the ACL, with any subsequent recoveries credited back to the ACL account. Expected recoveries may not exceed the aggregate of amounts previously charged off and expected to be charged off.
Fair Value Measurement	The Corporation uses estimates of fair value in applying various accounting standards for its consolidated financial statements on either a recurring or non-recurring basis. Fair value is defined as the price to sell an asset or transfer a liability in an orderly transaction between willing and able market participants. Mid Penn groups its assets and liabilities measured at fair value in three hierarchy levels, based on the observability and transparency of the inputs. The fair value hierarchy is as follows: Level 1 - Inputs that represent quoted prices for identical instruments in active markets. Level 2 - Inputs that represent quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability. Level 3 - Inputs that are largely unobservable, as little or no market data exists for the instrument being valued.

Business Combination (Tables)

Business Combination (Tables)	9 Months Ended
	Sep. 30, 2023
Business Combinations [Abstract]
Summary of the Final Estimated Fair Value of the Assets Acquired and Liabilities and Equity Assumed	Estimated fair values of the assets acquired and liabilities assumed in the Brunswick Acquisition as of the closing date are as follows: (In thousands) Assets acquired: Cash and cash equivalents $ 21,029 Federal funds sold 7,604 Investment securities 1,825 Loans 324,471 Goodwill 15,521 Core deposit intangible 999 Premises and equipment 5,315 Cash surrender value of life insurance 3,361 Deferred income taxes 6,792 Accrued interest receivable 1,171 Other assets 3,860 Total assets acquired 391,948 Liabilities assumed: Deposits: Noninterest-bearing demand 62,123 Interest-bearing demand 11,767 Money Market 47,362 Savings 14,203 Time 147,164 Long-term debt 60,137 Accrued interest payable 1,911 Other liabilities 1,621 Total liabilities assumed 346,288 Consideration paid $ 45,660 Cash paid $ 27,565 Fair value of common stock issued 18,095

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2023
Securities Financing Transactions Disclosures [Abstract]
Unrealized Gain (Loss) on Investments	The amortized cost and estimated fair value of investment securities for the periods presented: September 30, 2023 (In thousands) Amortized Gross Gross Unrealized Estimated Available-for-sale U.S. Treasury and U.S. government agencies $ 36,609 $ — $ 1,878 $ 34,731 Mortgage-backed U.S. government agencies 173,060 — 24,416 148,644 State and political subdivision obligations 4,338 — 1,026 3,312 Corporate debt securities 35,729 — 4,352 31,377 Total available-for-sale debt securities 249,736 — 31,672 218,064 Held-to-maturity U.S. Treasury and U.S. government agencies $ 245,771 $ — $ 40,363 $ 205,408 Mortgage-backed U.S. government agencies 45,374 — 7,614 37,760 State and political subdivision obligations 84,942 — 11,330 73,612 Corporate debt securities 25,474 — 1,248 24,226 Total held-to-maturity debt securities 401,561 — 60,555 341,006 Total $ 651,297 $ — $ 92,227 $ 559,070 December 31, 2022 (In thousands) Amortized Gross Gross Unrealized Estimated Available-for-sale U.S. Treasury and U.S. government agencies $ 36,528 $ — $ 1,614 $ 34,914 Mortgage-backed U.S. government agencies 185,993 — 19,078 166,915 State and political subdivision obligations 4,354 — 815 3,539 Corporate debt securities 35,467 — 2,957 32,510 Total available-for-sale debt securities $ 262,342 $ — $ 24,464 $ 237,878 Held-to-maturity U.S. Treasury and U.S. government agencies $ 245,671 $ — $ 34,834 $ 210,837 Mortgage-backed U.S. government agencies 50,710 — 6,676 44,034 State and political subdivision obligations 87,125 — 8,345 78,780 Corporate debt securities 15,988 — 1,134 14,854 Total held-to-maturity debt securities 399,494 — 50,989 348,505 Total $ 661,836 $ — $ 75,453 $ 586,383
Schedule of Fair Value and Unrealized Loss on Debt Security Investments in a Continuous Unrealized Loss Position	The following tables present gross unrealized losses and fair value of debt investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented: (Dollars in thousands) Less Than 12 Months 12 Months or More Total September 30, 2023 Number Estimated Gross Number Estimated Gross Number Estimated Gross Available-for-sale debt securities: U.S. Treasury and U.S. government agencies — $ — $ — 19 $ 34,731 $ 1,878 19 $ 34,731 $ 1,878 Mortgage-backed U.S. government agencies 1 1,455 122 92 147,189 24,294 93 148,644 24,416 State and political subdivision obligations — — — 8 3,312 1,026 8 3,312 1,026 Corporate debt securities — — — 18 31,377 4,352 18 31,377 4,352 Total available-for-sale debt securities 1 $ 1,455 $ 122 137 $ 216,609 $ 31,550 138 $ 218,064 $ 31,672 Held-to-maturity debt securities: U.S. Treasury and U.S. government agencies 4 5,627 858 141 199,781 39,505 145 205,408 40,363 Mortgage-backed U.S. government agencies 2 971 61 62 36,789 7,553 64 37,760 7,614 State and political subdivision obligations 5 1,568 463 194 72,044 10,867 199 73,612 11,330 Corporate debt securities — — — 15 24,226 1,248 15 24,226 1,248 Total held-to-maturity debt securities 11 8,166 1,382 412 332,840 59,173 423 341,006 60,555 Total 12 $ 9,621 $ 1,504 549 $ 549,449 $ 90,723 561 $ 559,070 $ 92,227 (Dollars in thousands) Less Than 12 Months 12 Months or More Total December 31, 2022 Number Estimated Gross Number Estimated Gross Number Estimated Gross Available-for-sale securities: U.S. Treasury and U.S. government agencies 19 $ 34,914 $ 1,614 — $ — $ — 19 $ 34,914 $ 1,614 Mortgage-backed U.S. government agencies 69 131,879 11,876 24 35,036 7,202 93 166,915 19,078 State and political subdivision obligations 6 2,521 671 2 1,018 144 8 3,539 815 Corporate debt securities 12 25,063 2,153 4 4,196 804 16 29,259 2,957 Total available-for-sale securities 106 194,377 16,314 30 40,250 8,150 136 234,627 24,464 Held-to-maturity securities: U.S. Treasury and U.S. government agencies 54 $ 84,946 $ 10,093 91 $ 125,891 $ 24,741 145 $ 210,837 $ 34,834 Mortgage-backed U.S. government agencies 40 13,866 1,071 24 30,168 5,605 64 44,034 6,676 State and political subdivision obligations 185 73,735 7,413 18 4,616 932 203 78,351 8,345 Corporate debt securities 4 5,721 317 5 5,182 817 9 10,903 1,134 Total held to maturity securities 283 178,268 18,894 138 165,857 32,095 421 344,125 50,989 Total 389 $ 372,645 $ 35,208 168 $ 206,107 $ 40,245 557 $ 578,752 $ 75,453
Investments Classified by Contractual Maturity Date	The table below illustrates the contractual maturity of debt investment securities at amortized cost and estimated fair value. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay with or without call or prepayment penalties. (In thousands) Available-for-sale Held-to-maturity September 30, 2023 Amortized Fair Amortized Fair Due in 1 year or less $ 6,995 $ 6,878 $ 8,076 $ 7,960 Due after 1 year but within 5 years 37,872 36,109 94,702 86,955 Due after 5 years but within 10 years 29,472 24,686 209,213 172,101 Due after 10 years 2,337 1,747 44,196 36,230 76,676 69,420 356,187 303,246 Mortgage-backed securities 173,060 148,644 45,374 37,760 $ 249,736 $ 218,064 $ 401,561 $ 341,006

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses - Loans (Tables)	9 Months Ended
	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Financing Receivable Credit Quality Indicators	Loans, net of unearned income, are summarized as follows by portfolio segment: (In thousands) September 30, 2023 December 31, 2022 Commercial real estate (1) $ 2,288,396 $ 2,052,934 Commercial and industrial 648,439 596,042 Construction 462,215 441,246 Residential mortgage (1) 743,533 416,221 Consumer 3,074 7,676 Total loans $ 4,145,657 $ 3,514,119 (1) In accordance with the guidance in FASB ASC Topic 326, Mid Penn redefined its loan portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. As such, $181.9 million of loans were reclassified from Commercial real estate to Residential mortgage upon adoption of CECL on January 1, 2023. Prior periods were not reclassified. September 30, 2023 Term Loans Amortized Cost Basis by Origination Year Revolving Loans Amortized (In thousands) 2023 2022 2021 2020 2019 Prior Total Commercial real estate Pass $ 230,714 $ 555,982 $ 391,929 $ 303,897 $ 188,508 $ 545,699 $ 35,339 $ 2,252,068 Special mention 200 — 210 — — 16,825 190 17,425 Substandard or lower — 5,241 — 3,176 230 10,208 48 18,903 Total commercial real estate 230,914 561,223 392,139 307,073 188,738 572,732 35,577 2,288,396 Gross charge offs — — — — — (16) — (16) Net charge offs — — — — — (16) — (16) Commercial and industrial Pass 110,268 111,429 75,748 31,053 52,412 62,133 192,538 635,581 Special mention — 141 786 — — 2,652 5,055 8,634 Substandard or lower — 150 — — — 1,587 2,487 4,224 Total commercial and industrial 110,268 111,720 76,534 31,053 52,412 66,372 200,080 648,439 Gross charge offs — (100) — (111) — (9) — (220) Net charge offs — (100) — (111) — (9) — (220) Construction Pass 104,753 214,316 84,231 22,267 10,282 6,395 15,441 457,685 Special mention — 573 — 1,700 — — — 2,273 Substandard or lower — — — — — 2,257 — 2,257 Total construction 104,753 214,889 84,231 23,967 10,282 8,652 15,441 462,215 Residential mortgage Performing 129,139 132,888 87,794 93,336 28,454 184,398 84,569 740,578 Non-performing — — 37 226 — 2,692 — 2,955 Total residential mortgage 129,139 132,888 87,831 93,562 28,454 187,090 84,569 743,533 Gross charge offs — — — — — (4) — (4) Current period recoveries — — — — — 37 — 37 Net recoveries — — — — — 33 — 33 Consumer Performing 1,497 810 — — 98 380 289 3,074 Non-performing — — — — — — — — Total consumer 1,497 810 — — 98 380 289 3,074 Gross charge offs (70) — (8) (9) — (30) — (117) Current period recoveries 26 — — — — — — 26 Net charge offs (44) — (8) (9) — (30) — (91) Total Pass $ 445,735 $ 881,727 $ 551,908 $ 357,217 $ 251,202 $ 614,227 $ 243,318 $ 3,345,334 Special mention 200 714 996 1,700 — 19,477 5,245 28,332 Substandard or lower — 5,391 — 3,176 230 14,052 2,535 25,384 Performing 130,636 133,698 87,794 93,336 28,552 184,778 84,858 743,652 Nonperforming — — 37 226 — 2,692 — 2,955 Total $ 576,571 $ 1,021,530 $ 640,735 $ 455,655 $ 279,984 $ 835,226 $ 335,956 $ 4,145,657 The information presented in the designated internal risk categories by portfolio segment table presented above is not required for periods prior to the adoption of CECL. The following table presents the most comparable required information for the prior period, internal credit risk ratings, for the indicated loan portfolio segments as of December 31, 2022: (In thousands) Pass Special Substandard Total December 31, 2022 Commercial real estate $ 2,018,088 $ 12,325 $ 22,521 $ 2,052,934 Commercial and industrial 582,540 4,212 9,290 596,042 Construction 438,990 2,256 — 441,246 Residential mortgage 409,259 3,104 3,858 416,221 Consumer 7,676 — — 7,676 Total loans $ 3,456,553 $ 21,897 $ 35,669 $ 3,514,119
Loan Portfolio Summarized by the Past Due Status	The performance and credit quality of the loan portfolio is also monitored by analyzing the age of the loans receivable as determined by the length of time a recorded payment is past due. The classes of the loan portfolio summarized by the past due status as of September 30, 2023 and December 31, 2022, are summarized as follows: (In thousands) 30-59 60-89 Greater Total Past Current Total Loans Loans September 30, 2023 Commercial real estate $ 8,355 $ — $ 3,006 $ 11,361 $ 2,277,035 $ 2,288,396 $ — Commercial and industrial 232 — 1,533 1,765 646,674 648,439 — Construction 472 — 2,256 2,728 459,487 462,215 — Residential mortgage 4,068 233 1,675 5,976 737,557 743,533 9 Consumer — — 3 3 3,071 3,074 3 Total $ 13,127 $ 233 $ 8,473 $ 21,833 $ 4,123,824 $ 4,145,657 $ 12 (In thousands) 30-59 60-89 Greater Total Past Current Total Loans Loans December 31, 2022 Commercial real estate $ 1,792 $ — $ 1,438 $ 3,230 $ 2,047,167 $ 2,050,397 $ — Commercial and industrial 1,808 3 1,854 3,665 592,377 596,042 654 Construction 2,258 — — 2,258 438,988 441,246 — Residential mortgage 3,826 955 670 5,451 409,630 415,081 — Consumer 44 19 — 63 7,613 7,676 — Loans acquired with credit deterioration: Commercial real estate 78 — 826 904 1,633 2,537 — Commercial and industrial — — — — — — — Construction — — — — — — — Residential mortgage 223 228 241 692 448 1,140 — Consumer — — — — — — — Total $ 10,029 $ 1,205 $ 5,029 $ 16,263 $ 3,497,856 $ 3,514,119 $ 654
Non-accrual Loans by Classes of the Loan Portfolio Including Loans Acquired With Credit Deterioration	Nonaccrual loans by loan portfolio class, including loans acquired with credit deterioration, as of September 30, 2023 and December 31, 2022 are summarized as follows: September 30, 2023 December 31, 2022 Non-accrual Loans Total non-accrual Loans (In thousands) With a Related Allowance Without a Related Allowance Total Commercial real estate $ 461 $ 6,228 $ 6,689 $ 4,864 Commercial and industrial 1,375 181 1,556 1,222 Construction — 2,256 2,256 — Residential mortgage 95 2,862 2,957 1,698 Consumer — — — 411 $ 1,931 $ 11,527 $ 13,458 $ 8,195
Allowance and Recorded Investment in Financing Receivables	The following table presents the activity in the ACL - loans by portfolio segment for the three and nine months ended September 30, 2023: (In thousands) Commercial real estate Commercial and industrial Construction Residential mortgage Consumer Total Balance at June 30, 2023 $ 14,197 $ 11,403 $ 3,667 $ 3,145 $ 176 $ 32,588 Purchase credit deteriorated loans — — — — — — Loans charged off — — — — (33) (33) Recoveries — — — 7 15 22 Net loans (charged off) recovered — — — 7 (18) (11) Provision for credit losses (1) 4,483 (4,072) 2,211 (1,060) (135) 1,427 Balance at September 30, 2023 $ 18,680 $ 7,331 $ 5,878 $ 2,092 $ 23 $ 34,004 (In thousands) Commercial real estate Commercial and industrial Construction Residential mortgage Consumer Unallocated Total Balance at December 31, 2022 $ 13,142 $ 4,593 $ — $ 1,319 $ 29 $ (126) $ 18,957 Impact of adopting CECL 288 6,600 3,201 1,562 154 126 11,931 Purchase credit deteriorated loans 314 5 13 4 — — 336 Loans charged off (16) (220) — (4) (117) — (357) Recoveries — — — 37 26 — 63 Net loans (charged off) recovered (16) (220) — 33 (91) — (294) Provision for credit losses (1) 4,952 (3,647) 2,664 (826) (69) — 3,074 Balance at September 30, 2023 $ 18,680 $ 7,331 $ 5,878 $ 2,092 $ 23 $ — $ 34,004 (1) Includes a $2.0 million initial provision for credit losses on non-PCD loans acquired in the Brunswick Acquisition. The following table presents the ACL for loans and the amortized cost basis of the loans by the measurement methodology used as of September 30, 2023: (In thousands) ACL - Loans Loans September 30, 2023 Collectively Evaluated for Credit Loss Individually Evaluated for Credit Loss Total ACL - Loans Collectively Evaluated for Credit Loss Individually Evaluated for Credit Loss Total Loans Commercial Real Estate $ 18,300 $ 380 $ 18,680 $ 2,281,707 $ 6,689 $ 2,288,396 Commercial & Industrial 6,623 708 7,331 646,883 1,556 648,439 Construction 5,878 — 5,878 459,959 2,256 462,215 Residential Mortgage 2,090 2 2,092 740,573 2,960 743,533 Consumer 23 — 23 3,074 — 3,074 Total $ 32,914 $ 1,090 $ 34,004 $ 4,132,196 $ 13,461 $ 4,145,657 (In thousands) As of, and for the Commercial Real Estate Commercial and industrial Construction Residential mortgage Consumer Unallocated Total Allowance for loan and lease losses: July 1, 2022 $ 11,991 $ 3,671 $ 46 $ 1,143 $ 2 $ 23 $ 16,876 Charge-offs — (1) — (3) (11) — (15) Recoveries 63 — — — 6 — 69 Provisions 468 879 5 162 5 31 1,550 September 30, 2022 12,522 4,549 51 1,302 2 54 18,480 Individually evaluated for impairment 28 831 — 51 — — 910 Collectively evaluated for impairment $ 12,494 $ 3,718 $ 51 $ 1,251 $ 2 $ 54 $ 17,570 (In thousands) As of, and for the Commercial Real Estate Commercial and industrial Construction Residential mortgage Consumer Unallocated Total Allowance for loan and lease losses: January 1, 2022 $ 9,415 $ 3,439 $ 38 $ 1,019 $ 2 $ 684 $ 14,597 Charge-offs — (1) — (3) (77) — (81) Recoveries 128 13 24 4 20 — 189 Provisions 2,979 1,098 (11) 282 57 (630) 3,775 September 30, 2022 12,522 4,549 51 1,302 2 54 18,480 Individually evaluated for impairment 28 831 — 51 — — 910 Collectively evaluated for impairment $ 12,494 $ 3,718 $ 51 $ 1,251 $ 2 $ 54 $ 17,570 Loans Receivable Ending Balance $ 1,944,802 $ 556,796 $ 400,188 $ 412,518 $ 8,153 $ — $ 3,322,457 Individually Evaluated for impairment 713 1,309 — 1,675 — — 3,697 Acquired with credit deterioration 1,364 — 1,222 1,232 — — 3,818 $ 1,942,725 $ 555,487 $ 398,966 $ 409,611 $ 8,153 $ — $ 3,314,942
Troubled Debt Restructurings	Information related to loans modified (by type of modification), whereby the borrower was experiencing financial difficulty at the time of modification, is set forth in the following table: (In thousands) Interest Only Term Extension Combination: Total % of Total Class of Financing Receivable Nine months ended September 30, 2023 Commercial real estate $ 51 $ — $ 180 $ 231 0.01 % Commercial and industrial — 150 — 150 0.02 Total $ 51 $ 150 $ 180 $ 381 0.01 %

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amount and Fair Value of Mortgage Banking Derivative Financial Instruments	Information related to mortgage banking hedging activity is set forth in the following table: September 30, 2023 December 31, 2022 (In thousands) Notional Amount Asset (Liability) Fair Value Notional Amount Asset (Liability) Fair Value Interest Rate Lock Commitments Positive Fair Values $ 2,233 $ 15 $ 274 $ 3 Negative Fair Values 4,043 (24) 5,252 (40) Forward Commitments Positive Fair Values 4,011 18 4,750 43 Negative Fair Values 3,146 (44) — — Information related to loan level swaps is set forth in the following table: September 30, 2023 December 31, 2022 (Dollars in thousands) Interest rate swaps on loans with customers Notional amount $ 150,769 $ 123,795 Weighted average remaining term (years) 6.84 7.85 Receive fixed rate (weighted average) 4.17 % 3.59 % Pay variable rate (weighted average 7.36 % 6.09 % Estimated fair value $ 14,070 $ 11,697 September 30, 2023 December 31, 2022 (Dollars in thousands) Interest rate swaps on loans with correspondents Notional amount $ 150,769 $ 123,795 Weighted average remaining term (years) 6.84 7.85 Receive variable rate (weighted average) 7.36 % 6.09 % Pay fixed rate (weighted average 4.17 % 3.59 % Estimated fair value $ 14,070 $ 11,697 Information related to cash flow hedges is set forth in the following table: September 30, 2023 (Dollars in thousands) Cash flow hedges Notional amount $ 190,000 Weighted average remaining term (years) 2.47 Pay fixed rate (weighted average) 3.74 % Receive variable rate (weighted average 4.78 % Estimated fair value $ 4,914

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	9 Months Ended
	Sep. 30, 2023
Other Income and Expenses [Abstract]
Components of Accumulated Other Comprehensive (Loss) Income, Net of Taxes	The changes in each component of accumulated other comprehensive loss, net of taxes, are as follows: (I n thousands ) Unrealized Loss on Unrealized Defined Benefit Total Balance at June 30, 2023 $ (20,611) $ 2,709 $ 97 $ (17,805) OCI before reclassifications (4,410) 859 (6) (3,557) Amounts reclassified from AOCI — — — — Balance at September 30, 2023 $ (25,021) $ 3,568 $ 91 (21,362) Balance at December 31, 2022 $ (19,327) $ — $ 111 $ (19,216) OCI before reclassifications (5,694) 3,568 (8) (2,134) Amounts reclassified from AOCI — — (12) (12) Balance at September 30, 2023 $ (25,021) $ 3,568 $ 91 $ (21,362) Balance at June 30, 2022 $ (10,297) $ — $ 538 $ (9,759) OCI before reclassifications (9,376) — 11 (9,365) Amounts reclassified from AOCI — — (6) (6) Balance at September 30, 2022 $ (19,673) $ — $ 543 $ (19,130) Balance at December 31, 2021 $ (255) $ — $ 413 $ 158 OCI before reclassifications (19,418) — 138 (19,280) Amounts reclassified from AOCI — — (8) (8) Balance at September 30, 2022 $ (19,673) $ — $ 543 $ (19,130)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value on a Recurring Basis	The following tables illustrate the assets measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets. September 30, 2023 (In thousands) Level 1 Level 2 Level 3 Total Available-for-sale securities: U.S. Treasury and U.S. government agencies $ — $ 34,731 $ — $ 34,731 Mortgage-backed U.S. government agencies — 148,644 — 148,644 State and political subdivision obligations — 3,312 — 3,312 Corporate debt securities — 31,377 — 31,377 Equity securities 413 — — 413 Loans held for sale — 4,270 — 4,270 Other assets: Derivative assets — 18,608 — 18,608 Total $ 413 $ 240,942 $ — $ 241,355 December 31, 2022 (In thousands) Level 1 Level 2 Level 3 Total Available-for-sale securities: U.S. Treasury and U.S. government agencies $ — $ 34,914 $ — $ 34,914 Mortgage-backed U.S. government agencies — 166,915 — 166,915 State and political subdivision obligations — 3,539 — 3,539 Corporate debt securities — 32,510 — 32,510 Equity securities 430 — — 430 Loans held for sale — 2,475 — 2,475 Other assets: Derivative assets — 11,703 — 11,703 Total $ 430 $ 252,056 $ — $ 252,486
Fair Value Measurements, Nonrecurring	The following table illustrates Level 3 financial instruments measured at fair value on a nonrecurring basis: (In thousands) September 30, 2023 December 31, 2022 Individually evaluated loans, net of ACL $ 12,371 $ 4,022 Foreclosed assets held for sale 905 43
Fair Value, by Balance Sheet Grouping	The following tables summarize the carrying amount, fair value, and placement in the fair value hierarchy of Mid Penn's financial instruments as of the periods presented: September 30, 2023 Carrying Estimated Fair Value (In thousands) Level 1 Level 2 Level 3 Total Financial instruments - assets Cash and cash equivalents $ 118,099 $ 118,099 $ — $ — $ 118,099 Available-for-sale investment securities 218,064 — 218,064 — 218,064 Held-to-maturity investment securities 401,561 — 341,006 — 341,006 Equity securities 413 413 — — 413 Loans held for sale 4,270 — 4,270 — 4,270 Net loans 4,111,653 — — 3,930,893 3,930,893 Restricted investment in bank stocks 13,554 13,554 — — 13,554 Accrued interest receivable 24,230 24,230 — — 24,230 Derivative assets 18,608 — 18,608 — 18,608 Financial instruments - liabilities Deposits $ 4,381,616 $ — $ 3,902,627 $ — $ 3,902,627 Short-term borrowings 139,000 — 139,000 — 139,000 Long-term debt (1) 55,771 — 54,047 — 54,047 Subordinated debt 46,501 — 38,669 — 38,669 Accrued interest payable 14,657 14,657 — — 14,657 Derivative liabilities 14,080 — 14,080 — 14,080 (1) Long-term debt excludes finance lease obligations. December 31, 2022 Estimated Fair Value (In thousands) Carrying Level 1 Level 2 Level 3 Total Financial instruments - assets Cash and cash equivalents $ 60,881 $ 60,881 $ — $ — $ 60,881 Available-for-sale investment securities 237,878 — 237,878 — 237,878 Held-to-maturity investment securities 399,494 — 348,505 — 348,505 Equity securities 430 430 — — 430 Loans held for sale 2,475 — 2,475 — 2,475 Net loans 3,495,162 — — 3,439,948 3,439,948 Restricted investment in bank stocks 8,315 8,315 — — 8,315 Accrued interest receivable 18,405 18,405 — — 18,405 Derivative assets 11,703 — 11,703 — 11,703 Financial instruments - liabilities Deposits $ 3,778,331 $ — $ 3,761,260 $ — $ 3,761,260 Short-term debt 102,647 — 102,647 — 102,647 Long-term debt (1) 1,119 — 1,069 — 1,069 Subordinated debt 56,941 — 55,917 — 55,917 Accrued interest payable 2,303 2,303 — — 2,303 Derivative liabilities 11,737 — 11,737 — 11,737 (1) Long-term debt excludes finance lease obligations.

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2023
Maturities of Long-Term Debt [Abstract]
Long-term Debt Outstanding by Due Date	The following table presents a summary of long-term debt as of September 30, 2023 and December 31, 2022. (Dollars in thousands) September 30, 2023 December 31, 2022 FHLB fixed rate instruments: Due January 2024, 1.10% $ 10,000 $ — Due March 2024, 5.60% 25,000 — Due February 2026, 4.51% 20,000 — Due August 2026, 4.80% 745 1,088 Due February 2027, 6.71% 26 31 Total FHLB fixed rate instruments 55,771 1,119 Lease obligations included in long-term debt 3,221 3,290 Total long-term debt $ 58,992 $ 4,409

Common Stock and Earnings Per_2

Common Stock and Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2023
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following data shows the amounts used in computing basic and diluted earnings per common share: Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except per share data) 2023 2022 2023 2022 Net income $ 9,236 $ 15,481 $ 25,299 $ 39,087 Weighted average common shares outstanding (basic) 16,571,825 15,877,592 16,233,006 15,922,945 Effect of dilutive unvested restricted stock grants 23,174 10,279 31,716 22,329 Weighted average common shares outstanding (diluted) 16,594,999 15,887,871 16,264,722 15,945,274 Basic earnings per common share $ 0.56 $ 0.97 $ 1.56 $ 2.45 Diluted earnings per common share 0.56 0.97 1.56 2.45

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Thousands		9 Months Ended
		Sep. 30, 2023 USD ($) Segment	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | Segment		1
Decrease in retained earnings		$ (528,711)	$ (525,888)	$ (510,793)	$ (512,099)	$ (499,105)	$ (495,835)	$ (494,161)	$ (490,076)
Deferred income taxes		25,509			13,674
Off-balance-sheet credit exposure		4,500			85
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses					15,000
Decrease in retained earnings	[1]				11,548
Deferred income taxes					3,100
Off-balance-sheet credit exposure					3,100
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in retained earnings		$ (137,199)	$ (131,271)	$ (129,617)	(133,114)	$ (120,572)	$ (108,265)	$ (99,206)	$ (91,043)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in retained earnings	[1]				$ 11,548
[1]The Corporation adopted ASU 2016-13

Business Combination - Narrativ

Business Combination - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	May 19, 2023 USD ($) branch shares	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 129,752		$ 129,752		$ 114,231
Merger and acquisition		352	$ 0	5,568	$ 0
Purchase credit deteriorated loans		0		336
Brunswick Bancorp Acquisition
Business Acquisition [Line Items]
Additional branches | branch	5
Equity interest issued or issuable, number of shares (in shares) | shares	849,510
Payments to acquire businesses gross	$ 27,565
Consideration transferred	45,700
Goodwill	15,521
Goodwill, expected tax deductible amount	0
Merger and acquisition		352		8,500
Amount at purchase price	18,700
Purchase credit deteriorated loans	355
Discount (premium)	2,100
Amount at par value	16,600
Provision expense	$ 2,000
Initial accounting incomplete, adjustment, consideration transferred		349
Initial accounting incomplete, adjustment, interest bearing demand deposit liabilities		6,400		6,400
Initial accounting incomplete, adjustment, non interest bearing demand deposit liabilities		$ (6,400)		$ (6,400)

Business Combination - Estimate

Business Combination - Estimated Fair Value of Assets Acquired (Details) - USD ($) $ in Thousands			9 Months Ended
		May 19, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Assets acquired:
Goodwill			$ 129,752		$ 114,231
Deposits:
Fair value of common stock issued	[1]		$ 18,095	$ 0
Brunswick Bancorp Acquisition
Assets acquired:
Cash and cash equivalents		$ 21,029
Federal funds sold		7,604
Investment securities		1,825
Loans		324,471
Goodwill		15,521
Core deposit intangible		999
Premises and equipment		5,315
Cash surrender value of life insurance		3,361
Deferred income taxes		6,792
Accrued interest receivable		1,171
Other assets		3,860
Total assets acquired		391,948
Deposits:
Noninterest-bearing demand		62,123
Interest-bearing demand		11,767
Money Market		47,362
Savings		14,203
Time		147,164
Long-term debt		60,137
Accrued interest payable		1,911
Other liabilities		1,621
Total liabilities assumed		346,288
Consideration paid		45,660
Cash paid		27,565
Fair value of common stock issued		$ 18,095
[1]Includes the impact of the Brunswick Acquisition on May 19, 2023. See "Note 2 - Business Combinations" to the Consolidated Financial Statement for additional information.

Investment Securities - Narrati

Investment Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
AFS accrued interest	$ 1,000		$ 1,000
Held-to-maturity securities	401,561		401,561		$ 399,494
HTM accrued interest	2,400		2,400
Available-for-sale securities pledged as collateral	392,600		392,600		338,800
Net gains	0	$ 0	0	$ 0
FHLB
Schedule of Investments [Line Items]
Letter of credit outstanding, amount	$ 226,000		$ 226,000		$ 189,000

Investment Securities - Unreali

Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale
Amortized Cost	$ 249,736	$ 262,342
Gross Unrealized Gains	0	0
Gross Unrealized Losses	31,672	24,464
Estimated Fair Value	218,064	237,878
Held-to-maturity
Amortized Cost	401,561	399,494
Gross Unrealized Gains	0	0
Gross Unrealized Losses	60,555	50,989
Estimated Fair Value	341,006	348,505
Amortized Cost	651,297	661,836
Gross Unrealized Gains	0	0
Gross Unrealized Losses	92,227	75,453
Estimated Fair Value	559,070	586,383
U.S. Treasury and U.S. government agencies
Available-for-sale
Amortized Cost	36,609	36,528
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,878	1,614
Estimated Fair Value	34,731	34,914
Held-to-maturity
Amortized Cost	245,771	245,671
Gross Unrealized Gains	0	0
Gross Unrealized Losses	40,363	34,834
Estimated Fair Value	205,408	210,837
Mortgage-backed U.S. government agencies
Available-for-sale
Amortized Cost	173,060	185,993
Gross Unrealized Gains	0	0
Gross Unrealized Losses	24,416	19,078
Estimated Fair Value	148,644	166,915
Held-to-maturity
Amortized Cost	45,374	50,710
Gross Unrealized Gains	0	0
Gross Unrealized Losses	7,614	6,676
Estimated Fair Value	37,760	44,034
State and political subdivision obligations
Available-for-sale
Amortized Cost	4,338	4,354
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,026	815
Estimated Fair Value	3,312	3,539
Held-to-maturity
Amortized Cost	84,942	87,125
Gross Unrealized Gains	0	0
Gross Unrealized Losses	11,330	8,345
Estimated Fair Value	73,612	78,780
Corporate debt securities
Available-for-sale
Amortized Cost	35,729	35,467
Gross Unrealized Gains	0	0
Gross Unrealized Losses	4,352	2,957
Estimated Fair Value	31,377	32,510
Held-to-maturity
Amortized Cost	25,474	15,988
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,248	1,134
Estimated Fair Value	$ 24,226	$ 14,854

Investment Securities - Schedul

Investment Securities - Schedule of Fair Value and Unrealized Loss on Debt Security Investments in a Continuous Unrealized Loss Position (Details)	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	1	106
Available-for-sale securities, Less than 12 Months: Fair Value	$ 1,455,000	$ 194,377,000
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 122,000	$ 16,314,000
Available-for-sale securities, 12 Months or More: Number of Securities | security	137	30
Available-for-sale securities, 12 Months or More: Fair Value	$ 216,609,000	$ 40,250,000
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 31,550,000	$ 8,150,000
Available-for-sale securities, Total: Number of Securities | security	138	136
Available-for-sale securities, Total: Fair Value	$ 218,064,000	$ 234,627,000
Available-for-sale securities, Total: Unrealized Losses	$ 31,672,000	$ 24,464,000
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	11	283
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 8,166,000	$ 178,268,000
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 1,382,000	$ 18,894,000
Held-to-maturity securities, 12 Months or More: Number of Securities | security	412	138
Held-to-maturity securities, 12 Months or More: Fair Value	$ 332,840,000	$ 165,857,000
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 59,173,000	$ 32,095,000
Held-to-maturity securities, Total: Number of Securities | security	423	421
Held-to-maturity securities, Total: Fair Value	$ 341,006,000	$ 344,125,000
Held-to-maturity securities, Total: Unrealized Losses	$ 60,555,000	$ 50,989,000
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security	12	389
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value	$ 9,621,000	$ 372,645,000
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 1,504,000	$ 35,208,000
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security	549	168
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value	$ 549,449,000	$ 206,107,000
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 90,723,000	$ 40,245,000
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security	561	557
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value	$ 559,070,000	$ 578,752,000
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses	$ 92,227,000	$ 75,453,000
U.S. Treasury and U.S. government agencies
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	0	19
Available-for-sale securities, Less than 12 Months: Fair Value	$ 0	$ 34,914,000
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 0	$ 1,614,000
Available-for-sale securities, 12 Months or More: Number of Securities | security	19	0
Available-for-sale securities, 12 Months or More: Fair Value	$ 34,731,000	$ 0
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 1,878,000	$ 0
Available-for-sale securities, Total: Number of Securities | security	19	19
Available-for-sale securities, Total: Fair Value	$ 34,731,000	$ 34,914,000
Available-for-sale securities, Total: Unrealized Losses	$ 1,878,000	$ 1,614,000
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	4	54
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 5,627,000	$ 84,946,000
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 858,000	$ 10,093,000
Held-to-maturity securities, 12 Months or More: Number of Securities | security	141	91
Held-to-maturity securities, 12 Months or More: Fair Value	$ 199,781,000	$ 125,891,000
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 39,505,000	$ 24,741,000
Held-to-maturity securities, Total: Number of Securities | security	145	145
Held-to-maturity securities, Total: Fair Value	$ 205,408,000	$ 210,837,000
Held-to-maturity securities, Total: Unrealized Losses	$ 40,363,000	$ 34,834,000
Mortgage-backed U.S. government agencies
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	1	69
Available-for-sale securities, Less than 12 Months: Fair Value	$ 1,455,000	$ 131,879,000
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 122,000	$ 11,876,000
Available-for-sale securities, 12 Months or More: Number of Securities | security	92	24
Available-for-sale securities, 12 Months or More: Fair Value	$ 147,189,000	$ 35,036,000
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 24,294,000	$ 7,202,000
Available-for-sale securities, Total: Number of Securities | security	93	93
Available-for-sale securities, Total: Fair Value	$ 148,644,000	$ 166,915,000
Available-for-sale securities, Total: Unrealized Losses	$ 24,416,000	$ 19,078,000
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	2	40
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 971,000	$ 13,866,000
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 61,000	$ 1,071,000
Held-to-maturity securities, 12 Months or More: Number of Securities | security	62	24
Held-to-maturity securities, 12 Months or More: Fair Value	$ 36,789,000	$ 30,168,000
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 7,553,000	$ 5,605,000
Held-to-maturity securities, Total: Number of Securities | security	64	64
Held-to-maturity securities, Total: Fair Value	$ 37,760,000	$ 44,034,000
Held-to-maturity securities, Total: Unrealized Losses	$ 7,614,000	$ 6,676,000
State and political subdivision obligations
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	0	6
Available-for-sale securities, Less than 12 Months: Fair Value	$ 0	$ 2,521,000
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 0	$ 671,000
Available-for-sale securities, 12 Months or More: Number of Securities | security	8	2
Available-for-sale securities, 12 Months or More: Fair Value	$ 3,312,000	$ 1,018,000
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 1,026,000	$ 144,000
Available-for-sale securities, Total: Number of Securities | security	8	8
Available-for-sale securities, Total: Fair Value	$ 3,312,000	$ 3,539,000
Available-for-sale securities, Total: Unrealized Losses	$ 1,026,000	$ 815,000
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	5	185
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 1,568,000	$ 73,735,000
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 463,000	$ 7,413,000
Held-to-maturity securities, 12 Months or More: Number of Securities | security	194	18
Held-to-maturity securities, 12 Months or More: Fair Value	$ 72,044,000	$ 4,616,000
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 10,867,000	$ 932,000
Held-to-maturity securities, Total: Number of Securities | security	199	203
Held-to-maturity securities, Total: Fair Value	$ 73,612,000	$ 78,351,000
Held-to-maturity securities, Total: Unrealized Losses	$ 11,330,000	$ 8,345,000
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	0	12
Available-for-sale securities, Less than 12 Months: Fair Value	$ 0	$ 25,063,000
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 0	$ 2,153,000
Available-for-sale securities, 12 Months or More: Number of Securities | security	18	4
Available-for-sale securities, 12 Months or More: Fair Value	$ 31,377,000	$ 4,196,000
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 4,352,000	$ 804,000
Available-for-sale securities, Total: Number of Securities | security	18	16
Available-for-sale securities, Total: Fair Value	$ 31,377,000	$ 29,259,000
Available-for-sale securities, Total: Unrealized Losses	$ 4,352,000	$ 2,957,000
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	0	4
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 0	$ 5,721,000
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 0	$ 317,000
Held-to-maturity securities, 12 Months or More: Number of Securities | security	15	5
Held-to-maturity securities, 12 Months or More: Fair Value	$ 24,226,000	$ 5,182,000
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 1,248,000	$ 817,000
Held-to-maturity securities, Total: Number of Securities | security	15	9
Held-to-maturity securities, Total: Fair Value	$ 24,226,000	$ 10,903,000
Held-to-maturity securities, Total: Unrealized Losses	$ 1,248,000	$ 1,134,000

Investment Securities - Investm

Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in 1 year or less	$ 6,995
Due after 1 year but within 5 years	37,872
Due after 5 years but within 10 years	29,472
Due after 10 years	2,337
Available-for-sale securities, amortized cost basis, Total	76,676
Amortized Cost	249,736	$ 262,342
Fair Value
Due in 1 year or less	6,878
Due after 1 year but within 5 years	36,109
Due after 5 years but within 10 years	24,686
Due after 10 years	1,747
Available-for-sale securities, fair value, Total	69,420
Available-for-sale securities, fair value	218,064	237,878
Amortized Cost
Due in 1 year or less	8,076
Due after 1 year but within 5 years	94,702
Due after 5 years but within 10 years	209,213
Due after 10 years	44,196
Held-to-maturity securities, amortized cost	356,187
Amortized Cost	401,561	399,494
Fair Value
Due in 1 year or less	7,960
Due after 1 year but within 5 years	86,955
Due after 5 years but within 10 years	172,101
Due after 10 years	36,230
Held-to-maturity securities, fair value	303,246
Held-to-maturity, Fair Value	341,006	$ 348,505
Mortgage-backed securities
Amortized Cost
Mortgage-backed securities	173,060
Fair Value
Mortgage-backed securities	148,644
Amortized Cost
Mortgage-backed securities	45,374
Fair Value
Mortgage-backed securities	$ 37,760

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Loans - Classes Of The Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	$ 4,145,657	$ 3,514,119	$ 3,314,942
Commercial portfolio | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	2,288,396	2,052,934	1,942,725
Commercial portfolio | Commercial real estate | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		(181,900)
Commercial portfolio | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	648,439	596,042	555,487
Commercial portfolio | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	462,215	441,246	398,966
Consumer portfolio | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	743,533	416,221	409,611
Consumer portfolio | Residential mortgage | Revision of Prior Period, Accounting Standards Update, Adjustment
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		181,900
Consumer portfolio | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	$ 3,074	$ 7,676	$ 8,153

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Loans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Net deferred loan fees	$ 3,900		$ 3,900		$ 3,900
Accrued interest	20,400		20,400
Interest income on nonaccrual loans	$ 551	$ 221	$ 1,000	$ 605
Weighted average term increase from modification			2 years

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Loans - Loan Portfolio Summarized By The Past Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	$ 4,145,657	$ 3,514,119	$ 3,314,942
Loans Receivable > 90 Days and Accruing	12	654
Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest			3,818
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	21,833	16,263
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	13,127	10,029
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	233	1,205
Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	8,473	5,029
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	4,123,824	3,497,856
Commercial portfolio | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	2,288,396	2,052,934	1,942,725
Commercial portfolio | Commercial real estate | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	2,288,396	2,050,397
Loans Receivable > 90 Days and Accruing	0	0
Commercial portfolio | Commercial real estate | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		2,537	1,364
Loans Receivable > 90 Days and Accruing		0
Commercial portfolio | Commercial real estate | Total Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	11,361	3,230
Commercial portfolio | Commercial real estate | Total Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		904
Commercial portfolio | Commercial real estate | 30-59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	8,355	1,792
Commercial portfolio | Commercial real estate | 30-59 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		78
Commercial portfolio | Commercial real estate | 60-89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	0	0
Commercial portfolio | Commercial real estate | 60-89 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Commercial real estate | Greater than 90 Days | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	3,006	1,438
Commercial portfolio | Commercial real estate | Greater than 90 Days | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		826
Commercial portfolio | Commercial real estate | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	2,277,035	2,047,167
Commercial portfolio | Commercial real estate | Current | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		1,633
Commercial portfolio | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	648,439	596,042	555,487
Commercial portfolio | Commercial and industrial | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	648,439	596,042
Loans Receivable > 90 Days and Accruing	0	654
Commercial portfolio | Commercial and industrial | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0	0
Loans Receivable > 90 Days and Accruing		0
Commercial portfolio | Commercial and industrial | Total Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	1,765	3,665
Commercial portfolio | Commercial and industrial | Total Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Commercial and industrial | 30-59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	232	1,808
Commercial portfolio | Commercial and industrial | 30-59 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Commercial and industrial | 60-89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	0	3
Commercial portfolio | Commercial and industrial | 60-89 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Commercial and industrial | Greater than 90 Days | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	1,533	1,854
Commercial portfolio | Commercial and industrial | Greater than 90 Days | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Commercial and industrial | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	646,674	592,377
Commercial portfolio | Commercial and industrial | Current | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	462,215	441,246	398,966
Commercial portfolio | Construction | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	462,215	441,246
Loans Receivable > 90 Days and Accruing	0	0
Commercial portfolio | Construction | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0	1,222
Loans Receivable > 90 Days and Accruing		0
Commercial portfolio | Construction | Total Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	2,728	2,258
Commercial portfolio | Construction | Total Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Construction | 30-59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	472	2,258
Commercial portfolio | Construction | 30-59 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Construction | 60-89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	0	0
Commercial portfolio | Construction | 60-89 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Construction | Greater than 90 Days | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	2,256	0
Commercial portfolio | Construction | Greater than 90 Days | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Commercial portfolio | Construction | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	459,487	438,988
Commercial portfolio | Construction | Current | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Consumer portfolio | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	743,533	416,221	409,611
Consumer portfolio | Residential mortgage | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	743,533	415,081
Loans Receivable > 90 Days and Accruing	9	0
Consumer portfolio | Residential mortgage | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		1,140	1,232
Loans Receivable > 90 Days and Accruing		0
Consumer portfolio | Residential mortgage | Total Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	5,976	5,451
Consumer portfolio | Residential mortgage | Total Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		692
Consumer portfolio | Residential mortgage | 30-59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	4,068	3,826
Consumer portfolio | Residential mortgage | 30-59 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		223
Consumer portfolio | Residential mortgage | 60-89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	233	955
Consumer portfolio | Residential mortgage | 60-89 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		228
Consumer portfolio | Residential mortgage | Greater than 90 Days | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	1,675	670
Consumer portfolio | Residential mortgage | Greater than 90 Days | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		241
Consumer portfolio | Residential mortgage | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	737,557	409,630
Consumer portfolio | Residential mortgage | Current | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		448
Consumer portfolio | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	3,074	7,676	8,153
Consumer portfolio | Consumer | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	3,074	7,676
Loans Receivable > 90 Days and Accruing	3	0
Consumer portfolio | Consumer | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0	$ 0
Loans Receivable > 90 Days and Accruing		0
Consumer portfolio | Consumer | Total Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	3	63
Consumer portfolio | Consumer | Total Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Consumer portfolio | Consumer | 30-59 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	0	44
Consumer portfolio | Consumer | 30-59 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Consumer portfolio | Consumer | 60-89 Days Past Due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	0	19
Consumer portfolio | Consumer | 60-89 Days Past Due | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Consumer portfolio | Consumer | Greater than 90 Days | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	3	0
Consumer portfolio | Consumer | Greater than 90 Days | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		0
Consumer portfolio | Consumer | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest	$ 3,071	7,613
Consumer portfolio | Consumer | Current | Acquired with credit deterioration
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned interest		$ 0

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Loans - Non-accrual Loans by Classes of the Loan Portfolio Including Loans Acquired With Credit Deterioration (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, with allowance	$ 1,931
Financing receivable, no allowance	11,527
Financing receivable, recorded investment, nonaccrual status	13,458	$ 8,195
Commercial portfolio | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, with allowance	461
Financing receivable, no allowance	6,228
Financing receivable, recorded investment, nonaccrual status	6,689	4,864
Commercial portfolio | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, with allowance	1,375
Financing receivable, no allowance	181
Financing receivable, recorded investment, nonaccrual status	1,556	1,222
Commercial portfolio | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, with allowance	0
Financing receivable, no allowance	2,256
Financing receivable, recorded investment, nonaccrual status	2,256	0
Consumer portfolio | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, with allowance	95
Financing receivable, no allowance	2,862
Financing receivable, recorded investment, nonaccrual status	2,957	1,698
Consumer portfolio | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, with allowance	0
Financing receivable, no allowance	0
Financing receivable, recorded investment, nonaccrual status	$ 0	$ 411

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
2023	$ 576,571		$ 576,571
2022	1,021,530		1,021,530
2021	640,735		640,735
2020	455,655		455,655
2019	279,984		279,984
Prior	835,226		835,226
Revolving Loans Amortized Cost Basis	335,956		335,956
Loans, net of unearned interest	4,145,657	$ 3,314,942	4,145,657	$ 3,314,942	$ 3,514,119
Gross charge offs
Charge-offs	(33)	(15)	(357)	(81)
Current period recoveries
Recoveries	22	69	63	189
Performing Financial Instruments
Financing Receivable, Recorded Investment [Line Items]
2023	130,636		130,636
2022	133,698		133,698
2021	87,794		87,794
2020	93,336		93,336
2019	28,552		28,552
Prior	184,778		184,778
Revolving Loans Amortized Cost Basis	84,858		84,858
Loans, net of unearned interest	743,652		743,652
Nonperforming Financial Instruments
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	0		0
2021	37		37
2020	226		226
2019	0		0
Prior	2,692		2,692
Revolving Loans Amortized Cost Basis	0		0
Loans, net of unearned interest	2,955		2,955
Pass
Financing Receivable, Recorded Investment [Line Items]
2023	445,735		445,735
2022	881,727		881,727
2021	551,908		551,908
2020	357,217		357,217
2019	251,202		251,202
Prior	614,227		614,227
Revolving Loans Amortized Cost Basis	243,318		243,318
Loans, net of unearned interest	3,345,334		3,345,334		3,456,553
Special Mention
Financing Receivable, Recorded Investment [Line Items]
2023	200		200
2022	714		714
2021	996		996
2020	1,700		1,700
2019	0		0
Prior	19,477		19,477
Revolving Loans Amortized Cost Basis	5,245		5,245
Loans, net of unearned interest	28,332		28,332		21,897
Substandard
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	5,391		5,391
2021	0		0
2020	3,176		3,176
2019	230		230
Prior	14,052		14,052
Revolving Loans Amortized Cost Basis	2,535		2,535
Loans, net of unearned interest	25,384		25,384		35,669
Commercial portfolio | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
2023	230,914		230,914
2022	561,223		561,223
2021	392,139		392,139
2020	307,073		307,073
2019	188,738		188,738
Prior	572,732		572,732
Revolving Loans Amortized Cost Basis	35,577		35,577
Loans, net of unearned interest	2,288,396	1,942,725	2,288,396	1,942,725	2,052,934
Gross charge offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			(16)
Revolving Loans Amortized Cost Basis			0
Charge-offs	0	0	(16)	0
Current period recoveries
Recoveries	0	63	0	128
Net charge offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			(16)
Revolving Loans Amortized Cost Basis			0
Net loans (charged off) recovered			(16)
Commercial portfolio | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
2023	230,714		230,714
2022	555,982		555,982
2021	391,929		391,929
2020	303,897		303,897
2019	188,508		188,508
Prior	545,699		545,699
Revolving Loans Amortized Cost Basis	35,339		35,339
Loans, net of unearned interest	2,252,068		2,252,068		2,018,088
Commercial portfolio | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2023	200		200
2022	0		0
2021	210		210
2020	0		0
2019	0		0
Prior	16,825		16,825
Revolving Loans Amortized Cost Basis	190		190
Loans, net of unearned interest	17,425		17,425		12,325
Commercial portfolio | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	5,241		5,241
2021	0		0
2020	3,176		3,176
2019	230		230
Prior	10,208		10,208
Revolving Loans Amortized Cost Basis	48		48
Loans, net of unearned interest	18,903		18,903		22,521
Commercial portfolio | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2023	110,268		110,268
2022	111,720		111,720
2021	76,534		76,534
2020	31,053		31,053
2019	52,412		52,412
Prior	66,372		66,372
Revolving Loans Amortized Cost Basis	200,080		200,080
Loans, net of unearned interest	648,439	555,487	648,439	555,487	596,042
Gross charge offs
2023			0
2022			(100)
2021			0
2020			(111)
2019			0
Prior			(9)
Revolving Loans Amortized Cost Basis			0
Charge-offs	0	(1)	(220)	(1)
Current period recoveries
Recoveries	0	0	0	13
Net charge offs
2023			0
2022			(100)
2021			0
2020			(111)
2019			0
Prior			(9)
Revolving Loans Amortized Cost Basis			0
Net loans (charged off) recovered			(220)
Commercial portfolio | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
2023	110,268		110,268
2022	111,429		111,429
2021	75,748		75,748
2020	31,053		31,053
2019	52,412		52,412
Prior	62,133		62,133
Revolving Loans Amortized Cost Basis	192,538		192,538
Loans, net of unearned interest	635,581		635,581		582,540
Commercial portfolio | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	141		141
2021	786		786
2020	0		0
2019	0		0
Prior	2,652		2,652
Revolving Loans Amortized Cost Basis	5,055		5,055
Loans, net of unearned interest	8,634		8,634		4,212
Commercial portfolio | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	150		150
2021	0		0
2020	0		0
2019	0		0
Prior	1,587		1,587
Revolving Loans Amortized Cost Basis	2,487		2,487
Loans, net of unearned interest	4,224		4,224		9,290
Commercial portfolio | Construction
Financing Receivable, Recorded Investment [Line Items]
2023	104,753		104,753
2022	214,889		214,889
2021	84,231		84,231
2020	23,967		23,967
2019	10,282		10,282
Prior	8,652		8,652
Revolving Loans Amortized Cost Basis	15,441		15,441
Loans, net of unearned interest	462,215	398,966	462,215	398,966	441,246
Gross charge offs
Charge-offs	0	0	0	0
Current period recoveries
Recoveries	0	0	0	24
Commercial portfolio | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
2023	104,753		104,753
2022	214,316		214,316
2021	84,231		84,231
2020	22,267		22,267
2019	10,282		10,282
Prior	6,395		6,395
Revolving Loans Amortized Cost Basis	15,441		15,441
Loans, net of unearned interest	457,685		457,685		438,990
Commercial portfolio | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	573		573
2021	0		0
2020	1,700		1,700
2019	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Loans, net of unearned interest	2,273		2,273		2,256
Commercial portfolio | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	2,257		2,257
Revolving Loans Amortized Cost Basis	0		0
Loans, net of unearned interest	2,257		2,257		0
Consumer portfolio | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
2023	129,139		129,139
2022	132,888		132,888
2021	87,831		87,831
2020	93,562		93,562
2019	28,454		28,454
Prior	187,090		187,090
Revolving Loans Amortized Cost Basis	84,569		84,569
Loans, net of unearned interest	743,533	409,611	743,533	409,611	416,221
Gross charge offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			(4)
Revolving Loans Amortized Cost Basis			0
Charge-offs	0	(3)	(4)	(3)
Current period recoveries
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			37
Revolving Loans Amortized Cost Basis			0
Recoveries	7	0	37	4
Net charge offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			33
Revolving Loans Amortized Cost Basis			0
Net loans (charged off) recovered			33
Consumer portfolio | Residential mortgage | Performing Financial Instruments
Financing Receivable, Recorded Investment [Line Items]
2023	129,139		129,139
2022	132,888		132,888
2021	87,794		87,794
2020	93,336		93,336
2019	28,454		28,454
Prior	184,398		184,398
Revolving Loans Amortized Cost Basis	84,569		84,569
Loans, net of unearned interest	740,578		740,578
Consumer portfolio | Residential mortgage | Nonperforming Financial Instruments
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	0		0
2021	37		37
2020	226		226
2019	0		0
Prior	2,692		2,692
Revolving Loans Amortized Cost Basis	0		0
Loans, net of unearned interest	2,955		2,955
Consumer portfolio | Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest					409,259
Consumer portfolio | Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest					3,104
Consumer portfolio | Residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest					3,858
Consumer portfolio | Consumer
Financing Receivable, Recorded Investment [Line Items]
2023	1,497		1,497
2022	810		810
2021	0		0
2020	0		0
2019	98		98
Prior	380		380
Revolving Loans Amortized Cost Basis	289		289
Loans, net of unearned interest	3,074	8,153	3,074	8,153	7,676
Gross charge offs
2023			(70)
2022			0
2021			(8)
2020			(9)
2019			0
Prior			(30)
Revolving Loans Amortized Cost Basis			0
Charge-offs	(33)	(11)	(117)	(77)
Current period recoveries
2023			26
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving Loans Amortized Cost Basis			0
Recoveries	15	$ 6	26	$ 20
Net charge offs
2023			(44)
2022			0
2021			(8)
2020			(9)
2019			0
Prior			(30)
Revolving Loans Amortized Cost Basis			0
Net loans (charged off) recovered			(91)
Consumer portfolio | Consumer | Performing Financial Instruments
Financing Receivable, Recorded Investment [Line Items]
2023	1,497		1,497
2022	810		810
2021	0		0
2020	0		0
2019	98		98
Prior	380		380
Revolving Loans Amortized Cost Basis	289		289
Loans, net of unearned interest	3,074		3,074
Consumer portfolio | Consumer | Nonperforming Financial Instruments
Financing Receivable, Recorded Investment [Line Items]
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans Amortized Cost Basis	0		0
Loans, net of unearned interest	$ 0		$ 0
Consumer portfolio | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest					7,676
Consumer portfolio | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest					0
Consumer portfolio | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest					$ 0

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Loans - ACL Loans by Portfolio Segment (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	May 19, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		$ 32,588	$ 16,876	$ 18,957	$ 14,597
Purchase credit deteriorated loans		0		336
Charge-offs		(33)	(15)	(357)	(81)
Recoveries		22	69	63	189
Net loans (charged off) recovered		(11)		(294)
Provisions		1,427	1,550	3,074	3,775
Allowance for loan losses, ending balance		34,004	18,480	34,004	18,480
Brunswick Bancorp Acquisition
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Purchase credit deteriorated loans	$ 355
Provisions		2,000		2,000
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance				11,931
Commercial portfolio | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		14,197	11,991	13,142	9,415
Purchase credit deteriorated loans		0		314
Charge-offs		0	0	(16)	0
Recoveries		0	63	0	128
Net loans (charged off) recovered		0		(16)
Provisions		4,483	468	4,952	2,979
Allowance for loan losses, ending balance		18,680	12,522	18,680	12,522
Commercial portfolio | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance				288
Commercial portfolio | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		11,403	3,671	4,593	3,439
Purchase credit deteriorated loans		0		5
Charge-offs		0	(1)	(220)	(1)
Recoveries		0	0	0	13
Net loans (charged off) recovered		0		(220)
Provisions		(4,072)	879	(3,647)	1,098
Allowance for loan losses, ending balance		7,331	4,549	7,331	4,549
Commercial portfolio | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance				6,600
Commercial portfolio | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		3,667	46	0	38
Purchase credit deteriorated loans		0		13
Charge-offs		0	0	0	0
Recoveries		0	0	0	24
Net loans (charged off) recovered		0		0
Provisions		2,211	5	2,664	(11)
Allowance for loan losses, ending balance		5,878	51	5,878	51
Commercial portfolio | Construction | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance				3,201
Consumer portfolio | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		3,145	1,143	1,319	1,019
Purchase credit deteriorated loans		0		4
Charge-offs		0	(3)	(4)	(3)
Recoveries		7	0	37	4
Net loans (charged off) recovered		7		33
Provisions		(1,060)	162	(826)	282
Allowance for loan losses, ending balance		2,092	1,302	2,092	1,302
Consumer portfolio | Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance				1,562
Consumer portfolio | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		176	2	29	2
Purchase credit deteriorated loans		0		0
Charge-offs		(33)	(11)	(117)	(77)
Recoveries		15	6	26	20
Net loans (charged off) recovered		(18)		(91)
Provisions		(135)	5	(69)	57
Allowance for loan losses, ending balance		23	2	23	2
Consumer portfolio | Consumer | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance				154
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance			23	(126)	684
Purchase credit deteriorated loans				0
Charge-offs			0	0	0
Recoveries			0	0	0
Net loans (charged off) recovered				0
Provisions			31	0	(630)
Allowance for loan losses, ending balance		$ 0	$ 54	0	$ 54
Unallocated | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance				$ 126

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Loans - ACL for Loans and Amortized Cost Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: ending balance, collectively evaluated for impairment	$ 32,914			$ 17,570
Allowance for loan losses: ending balance, individually evaluated for impairment	1,090			910
Allowance for loan losses	34,004	$ 32,588	$ 18,957	18,480	$ 16,876	$ 14,597
Loans receivable: ending balance, collectively evaluated for impairment	4,132,196			3,322,457
Loans receivable: ending balance, individually evaluated for impairment	13,461			3,697
Loans, net of unearned interest	4,145,657		3,514,119	3,314,942
Commercial portfolio | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: ending balance, collectively evaluated for impairment	18,300			12,494
Allowance for loan losses: ending balance, individually evaluated for impairment	380			28
Allowance for loan losses	18,680	14,197	13,142	12,522	11,991	9,415
Loans receivable: ending balance, collectively evaluated for impairment	2,281,707			1,944,802
Loans receivable: ending balance, individually evaluated for impairment	6,689			713
Loans, net of unearned interest	2,288,396		2,052,934	1,942,725
Commercial portfolio | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: ending balance, collectively evaluated for impairment	6,623			3,718
Allowance for loan losses: ending balance, individually evaluated for impairment	708			831
Allowance for loan losses	7,331	11,403	4,593	4,549	3,671	3,439
Loans receivable: ending balance, collectively evaluated for impairment	646,883			556,796
Loans receivable: ending balance, individually evaluated for impairment	1,556			1,309
Loans, net of unearned interest	648,439		596,042	555,487
Commercial portfolio | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: ending balance, collectively evaluated for impairment	5,878			51
Allowance for loan losses: ending balance, individually evaluated for impairment	0			0
Allowance for loan losses	5,878	3,667	0	51	46	38
Loans receivable: ending balance, collectively evaluated for impairment	459,959			400,188
Loans receivable: ending balance, individually evaluated for impairment	2,256			0
Loans, net of unearned interest	462,215		441,246	398,966
Consumer portfolio | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: ending balance, collectively evaluated for impairment	2,090			1,251
Allowance for loan losses: ending balance, individually evaluated for impairment	2			51
Allowance for loan losses	2,092	3,145	1,319	1,302	1,143	1,019
Loans receivable: ending balance, collectively evaluated for impairment	740,573			412,518
Loans receivable: ending balance, individually evaluated for impairment	2,960			1,675
Loans, net of unearned interest	743,533		416,221	409,611
Consumer portfolio | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses: ending balance, collectively evaluated for impairment	23			2
Allowance for loan losses: ending balance, individually evaluated for impairment	0			0
Allowance for loan losses	23	$ 176	29	2	$ 2	$ 2
Loans receivable: ending balance, collectively evaluated for impairment	3,074			8,153
Loans receivable: ending balance, individually evaluated for impairment	0			0
Loans, net of unearned interest	$ 3,074		$ 7,676	$ 8,153

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Loans - Allowance And Recorded Investment In Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance	$ 32,588	$ 16,876	$ 18,957	$ 14,597
Charge-offs	(33)	(15)	(357)	(81)
Recoveries	22	69	63	189
Provisions	1,427	1,550	3,074	3,775
Allowance for loan losses, ending balance	34,004	18,480	34,004	18,480
Allowance for loan losses: ending balance, individually evaluated for impairment	1,090	910	1,090	910
Allowance for loan losses: ending balance, collectively evaluated for impairment	32,914	17,570	32,914	17,570
Loans receivable: ending balance, collectively evaluated for impairment	4,132,196	3,322,457	4,132,196	3,322,457
Loans receivable: ending balance, individually evaluated for impairment	13,461	3,697	13,461	3,697
Loans, net of unearned interest	4,145,657	3,314,942	4,145,657	3,314,942	$ 3,514,119
Acquired with credit deterioration
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans, net of unearned interest		3,818		3,818
Commercial portfolio | Commercial real estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance	14,197	11,991	13,142	9,415
Charge-offs	0	0	(16)	0
Recoveries	0	63	0	128
Provisions	4,483	468	4,952	2,979
Allowance for loan losses, ending balance	18,680	12,522	18,680	12,522
Allowance for loan losses: ending balance, individually evaluated for impairment	380	28	380	28
Allowance for loan losses: ending balance, collectively evaluated for impairment	18,300	12,494	18,300	12,494
Loans receivable: ending balance, collectively evaluated for impairment	2,281,707	1,944,802	2,281,707	1,944,802
Loans receivable: ending balance, individually evaluated for impairment	6,689	713	6,689	713
Loans, net of unearned interest	2,288,396	1,942,725	2,288,396	1,942,725	2,052,934
Commercial portfolio | Commercial real estate | Acquired with credit deterioration
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans, net of unearned interest		1,364		1,364	2,537
Commercial portfolio | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance	11,403	3,671	4,593	3,439
Charge-offs	0	(1)	(220)	(1)
Recoveries	0	0	0	13
Provisions	(4,072)	879	(3,647)	1,098
Allowance for loan losses, ending balance	7,331	4,549	7,331	4,549
Allowance for loan losses: ending balance, individually evaluated for impairment	708	831	708	831
Allowance for loan losses: ending balance, collectively evaluated for impairment	6,623	3,718	6,623	3,718
Loans receivable: ending balance, collectively evaluated for impairment	646,883	556,796	646,883	556,796
Loans receivable: ending balance, individually evaluated for impairment	1,556	1,309	1,556	1,309
Loans, net of unearned interest	648,439	555,487	648,439	555,487	596,042
Commercial portfolio | Commercial and industrial | Acquired with credit deterioration
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans, net of unearned interest		0		0	0
Commercial portfolio | Construction
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance	3,667	46	0	38
Charge-offs	0	0	0	0
Recoveries	0	0	0	24
Provisions	2,211	5	2,664	(11)
Allowance for loan losses, ending balance	5,878	51	5,878	51
Allowance for loan losses: ending balance, individually evaluated for impairment	0	0	0	0
Allowance for loan losses: ending balance, collectively evaluated for impairment	5,878	51	5,878	51
Loans receivable: ending balance, collectively evaluated for impairment	459,959	400,188	459,959	400,188
Loans receivable: ending balance, individually evaluated for impairment	2,256	0	2,256	0
Loans, net of unearned interest	462,215	398,966	462,215	398,966	441,246
Commercial portfolio | Construction | Acquired with credit deterioration
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans, net of unearned interest		1,222		1,222	0
Consumer portfolio | Residential mortgage
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance	3,145	1,143	1,319	1,019
Charge-offs	0	(3)	(4)	(3)
Recoveries	7	0	37	4
Provisions	(1,060)	162	(826)	282
Allowance for loan losses, ending balance	2,092	1,302	2,092	1,302
Allowance for loan losses: ending balance, individually evaluated for impairment	2	51	2	51
Allowance for loan losses: ending balance, collectively evaluated for impairment	2,090	1,251	2,090	1,251
Loans receivable: ending balance, collectively evaluated for impairment	740,573	412,518	740,573	412,518
Loans receivable: ending balance, individually evaluated for impairment	2,960	1,675	2,960	1,675
Loans, net of unearned interest	743,533	409,611	743,533	409,611	416,221
Consumer portfolio | Residential mortgage | Acquired with credit deterioration
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans, net of unearned interest		1,232		1,232	1,140
Consumer portfolio | Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance	176	2	29	2
Charge-offs	(33)	(11)	(117)	(77)
Recoveries	15	6	26	20
Provisions	(135)	5	(69)	57
Allowance for loan losses, ending balance	23	2	23	2
Allowance for loan losses: ending balance, individually evaluated for impairment	0	0	0	0
Allowance for loan losses: ending balance, collectively evaluated for impairment	23	2	23	2
Loans receivable: ending balance, collectively evaluated for impairment	3,074	8,153	3,074	8,153
Loans receivable: ending balance, individually evaluated for impairment	0	0	0	0
Loans, net of unearned interest	3,074	8,153	3,074	8,153	7,676
Consumer portfolio | Consumer | Acquired with credit deterioration
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans, net of unearned interest		0		0	$ 0
Unallocated
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, beginning balance		23	(126)	684
Charge-offs		0	0	0
Recoveries		0	0	0
Provisions		31	0	(630)
Allowance for loan losses, ending balance	$ 0	54	$ 0	54
Allowance for loan losses: ending balance, individually evaluated for impairment		0		0
Allowance for loan losses: ending balance, collectively evaluated for impairment		54		54
Loans receivable: ending balance, collectively evaluated for impairment		0		0
Loans receivable: ending balance, individually evaluated for impairment		0		0
Loans, net of unearned interest		0		0
Unallocated | Acquired with credit deterioration
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Loans, net of unearned interest		$ 0		$ 0

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Loans - Internal Risk Ratings (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	$ 4,145,657	$ 3,514,119	$ 3,314,942
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	3,345,334	3,456,553
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	28,332	21,897
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	25,384	35,669
Commercial portfolio | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	2,288,396	2,052,934	1,942,725
Commercial portfolio | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	2,252,068	2,018,088
Commercial portfolio | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	17,425	12,325
Commercial portfolio | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	18,903	22,521
Commercial portfolio | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	648,439	596,042	555,487
Commercial portfolio | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	635,581	582,540
Commercial portfolio | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	8,634	4,212
Commercial portfolio | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	4,224	9,290
Commercial portfolio | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	462,215	441,246	398,966
Commercial portfolio | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	457,685	438,990
Commercial portfolio | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	2,273	2,256
Commercial portfolio | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	2,257	0
Consumer portfolio | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	743,533	416,221	409,611
Consumer portfolio | Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		409,259
Consumer portfolio | Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		3,104
Consumer portfolio | Residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		3,858
Consumer portfolio | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest	$ 3,074	7,676	$ 8,153
Consumer portfolio | Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		7,676
Consumer portfolio | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		0
Consumer portfolio | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned interest		$ 0

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Loans - Troubled Debt Restructurings (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	$ 381
% of Total Class of Financing Receivable	0.01%
Interest Only
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	$ 51
Term Extension
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	150
Combination: Interest Only and Term Extension
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	180
Commercial portfolio | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	$ 231
% of Total Class of Financing Receivable	0.01%
Commercial portfolio | Commercial real estate | Interest Only
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	$ 51
Commercial portfolio | Commercial real estate | Term Extension
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	0
Commercial portfolio | Commercial real estate | Combination: Interest Only and Term Extension
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	180
Commercial portfolio | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	$ 150
% of Total Class of Financing Receivable	0.02%
Commercial portfolio | Commercial and industrial | Interest Only
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	$ 0
Commercial portfolio | Commercial and industrial | Term Extension
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	150
Commercial portfolio | Commercial and industrial | Combination: Interest Only and Term Extension
Financing Receivable, Modifications [Line Items]
Financing receivable, excluding accrued interest, modified period	$ 0

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest Rate Contract
Derivative [Line Items]
Cash flow hedge to be reclassified within 12 months			$ 2,900
Mortgage Banking Derivative Financial Instruments
Derivative [Line Items]
Net gains or losses recognized within other noninterest income	$ 67	$ 217	$ 215	$ 1,300

Derivative Financial Instrume_4

Derivative Financial Instruments - Notional Amount and Fair Value of Mortgage Banking Derivative Financial Instruments (Details) - Mortgage Banking Derivative Financial Instruments - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Interest Rate Lock Commitments | Positive
Derivative [Line Items]
Notional Amount	$ 2,233	$ 274
Asset (Liability) Fair Value	15	3
Interest Rate Lock Commitments | Negative
Derivative [Line Items]
Notional Amount	4,043	5,252
Asset (Liability) Fair Value	(24)	(40)
Forward Commitments | Positive
Derivative [Line Items]
Notional Amount	4,011	4,750
Asset (Liability) Fair Value	18	43
Forward Commitments | Negative
Derivative [Line Items]
Notional Amount	3,146	0
Asset (Liability) Fair Value	$ (44)	$ 0

Derivative Financial Instrume_5

Derivative Financial Instruments - Loan Level Swaps (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Interest Rate Swap with Customers | Commercial Loan
Derivative [Line Items]
Notional Amount	$ 150,769	$ 123,795
Weighted average remaining term (years)	6 years 10 months 2 days	7 years 10 months 6 days
Receive fixed rate (weighted average)	4.17%	3.59%
Pay variable rate (weighted average	7.36%	6.09%
Asset (Liability) Fair Value	$ 14,070	$ 11,697
Interest Rate Swap with Counterparties | Commercial Loan
Derivative [Line Items]
Notional Amount	$ 150,769	$ 123,795
Weighted average remaining term (years)	6 years 10 months 2 days	7 years 10 months 6 days
Receive fixed rate (weighted average)	7.36%	6.09%
Pay variable rate (weighted average	4.17%	3.59%
Asset (Liability) Fair Value	$ 14,070	$ 11,697
Interest Rate Swaps Used In Cash Flow Hedges | Cash Flow Hedging
Derivative [Line Items]
Notional Amount	$ 190,000	0
Weighted average remaining term (years)	2 years 5 months 19 days
Receive fixed rate (weighted average)	3.74%
Pay variable rate (weighted average	4.78%
Asset (Liability) Fair Value	$ 4,914	$ 0

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 525,888	$ 495,835	$ 512,099	$ 490,076
OCI before reclassifications	(3,557)	(9,365)	(2,134)	(19,280)
Amounts reclassified from AOCI	0	(6)	(12)	(8)
Balance	528,711	499,105	528,711	499,105
Unrealized Loss on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(20,611)	(10,297)	(19,327)	(255)
OCI before reclassifications	(4,410)	(9,376)	(5,694)	(19,418)
Amounts reclassified from AOCI	0	0	0	0
Balance	(25,021)	(19,673)	(25,021)	(19,673)
Unrealized Holding Losses on Interest Rate Derivatives used in Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	2,709	0	0	0
OCI before reclassifications	859	0	3,568	0
Amounts reclassified from AOCI	0	0	0	0
Balance	3,568	0	3,568	0
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	97	538	111	413
OCI before reclassifications	(6)	11	(8)	138
Amounts reclassified from AOCI	0	(6)	(12)	(8)
Balance	$ 91	$ 543	$ 91	$ 543

Fair Value Measurement - Assets

Fair Value Measurement - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	$ 218,064	$ 237,878
Equity securities	413	430
Loans held for sale	4,270	2,475
Derivative assets	18,608	11,703
Total	241,355	252,486
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
Equity securities	413	430
Loans held for sale	0	0
Derivative assets	0	0
Total	413	430
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	218,064	237,878
Equity securities	0	0
Loans held for sale	4,270	2,475
Derivative assets	18,608	11,703
Total	240,942	252,056
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
Equity securities	0	0
Loans held for sale	0	0
Derivative assets	0	0
Total	0	0
U.S. Treasury and U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	34,731	34,914
U.S. Treasury and U.S. government agencies | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
U.S. Treasury and U.S. government agencies | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	34,731	34,914
U.S. Treasury and U.S. government agencies | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
Mortgage-backed U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	148,644	166,915
Mortgage-backed U.S. government agencies | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
Mortgage-backed U.S. government agencies | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	148,644	166,915
Mortgage-backed U.S. government agencies | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
State and political subdivision obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	3,312	3,539
State and political subdivision obligations | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
State and political subdivision obligations | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	3,312	3,539
State and political subdivision obligations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	31,377	32,510
Corporate debt securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	0	0
Corporate debt securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	31,377	32,510
Corporate debt securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
AFS, at fair value	$ 0	$ 0

Fair Value Measurement - Fair V

Fair Value Measurement - Fair Value Measurements, Nonrecurring (Details) - Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Individually evaluated loans, net of ACL
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, nonrecurring	$ 12,371	$ 4,022
Foreclosed assets held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, nonrecurring	$ 905	$ 43

Fair Value Measurement - Fair_2

Fair Value Measurement - Fair Value, by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial instruments - assets
AFS, at fair value	$ 218,064	$ 237,878
Estimated Fair Value	341,006	348,505
Loans held for sale	4,270	2,475
Derivative assets	18,608	11,703
Level 1
Financial instruments - assets
Cash and cash equivalents	118,099	60,881
AFS, at fair value	0	0
Estimated Fair Value	0	0
Equity securities	413	430
Loans held for sale	0	0
Net loans	0	0
Restricted investment in bank stocks	13,554	8,315
Accrued interest receivable	24,230	18,405
Derivative assets	0	0
Financial instruments - liabilities
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated debt	0	0
Accrued interest payable	14,657	2,303
Derivative liabilities	0	0
Level 2
Financial instruments - assets
Cash and cash equivalents	0	0
AFS, at fair value	218,064	237,878
Estimated Fair Value	341,006	348,505
Equity securities	0	0
Loans held for sale	4,270	2,475
Net loans	0	0
Restricted investment in bank stocks	0	0
Accrued interest receivable	0	0
Derivative assets	18,608	11,703
Financial instruments - liabilities
Deposits	3,902,627	3,761,260
Short-term borrowings	139,000	102,647
Long-term debt	54,047	1,069
Subordinated debt	38,669	55,917
Accrued interest payable	0	0
Derivative liabilities	14,080	11,737
Level 3
Financial instruments - assets
Cash and cash equivalents	0	0
AFS, at fair value	0	0
Estimated Fair Value	0	0
Equity securities	0	0
Loans held for sale	0	0
Net loans	3,930,893	3,439,948
Restricted investment in bank stocks	0	0
Accrued interest receivable	0	0
Derivative assets	0	0
Financial instruments - liabilities
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated debt	0	0
Accrued interest payable	0	0
Derivative liabilities	0	0
Carrying Amount
Financial instruments - assets
Cash and cash equivalents	118,099	60,881
AFS, at fair value	218,064	237,878
Estimated Fair Value	401,561	399,494
Equity securities	413	430
Loans held for sale	4,270	2,475
Net loans	4,111,653	3,495,162
Restricted investment in bank stocks	13,554	8,315
Accrued interest receivable	24,230	18,405
Derivative assets	18,608	11,703
Financial instruments - liabilities
Deposits	4,381,616	3,778,331
Short-term borrowings	139,000	102,647
Long-term debt	55,771	1,119
Subordinated debt	46,501	56,941
Accrued interest payable	14,657	2,303
Derivative liabilities	14,080	11,737
Estimated Fair Value
Financial instruments - assets
Cash and cash equivalents	118,099	60,881
AFS, at fair value	218,064	237,878
Estimated Fair Value	341,006	348,505
Equity securities	413	430
Loans held for sale	4,270	2,475
Net loans	3,930,893	3,439,948
Restricted investment in bank stocks	13,554	8,315
Accrued interest receivable	24,230	18,405
Derivative assets	18,608	11,703
Financial instruments - liabilities
Deposits	3,902,627	3,761,260
Short-term borrowings	139,000	102,647
Long-term debt	54,047	1,069
Subordinated debt	38,669	55,917
Accrued interest payable	14,657	2,303
Derivative liabilities	$ 14,080	$ 11,737

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) Building	Sep. 30, 2023 USD ($) Apartment Shop Building	Dec. 31, 2022 USD ($)
Commitments, Contingencies and Guarantees [Line Items]
Off-balance-sheet credit exposure	$ 4,500	$ 4,500	$ 85
Off-balance-sheet, liability, credit loss expense (reversal)	661	$ 1,300
Cumulative Effect, Period of Adoption, Adjustment
Commitments, Contingencies and Guarantees [Line Items]
Off-balance-sheet credit exposure			3,100
Cumberland County, Pennsylvania
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment		39
Limited partner capital contribution	10,800	$ 10,800
Project investment amortization period		10 years
Total LIHTCs amount awarded for the project		$ 1,200
Total anticipated LIHTCs amount under the housing project	12,000	$ 12,000
Riverview
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment		17
Limited partner capital contribution	4,400	$ 4,400
Project investment amortization period		10 years
Total LIHTCs amount awarded for the project		$ 484
Total anticipated LIHTCs amount under the housing project	$ 4,800	$ 4,800
Number of buildings | Building	3	3
Number of shops under the project | Shop		2
Principal amount of construction loan	$ 3,500	$ 3,500
Debt instrument, interest rate, effective percentage	5.50%	5.50%
Term of construction loan		24 months
Financial Standby Letters of Credit
Commitments, Contingencies and Guarantees [Line Items]
Commitments to extend credit		$ 63,800	$ 57,200

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Short term borrowings	$ 139,000,000	$ 102,647,000
Maturity of federal funds purchased from correspondent banks	one business day
Current borrowing available	$ 1,300,000,000
Maximum borrowing capacity	1,700,000,000
FHLB
Debt Instrument [Line Items]
Letter of credit outstanding, amount	226,000,000	189,000,000
Other Correspondent Banks
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	35,000,000
Outstanding drawings	$ 0	$ 0

Debt - Long-term Debt Outstandi

Debt - Long-term Debt Outstanding by Due Date (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total FHLB fixed rate instruments	$ 55,771	$ 1,119
Lease obligations included in long-term debt	3,221	3,290
Total long-term debt	58,992	4,409
Due in January 2024
Debt Instrument [Line Items]
Long-term debt outstanding	$ 10,000	$ 0
Federal Home Loan Bank, advances, branch of FHLB bank, interest rate	1.10%	1.10%
Due in March 2024
Debt Instrument [Line Items]
Long-term debt outstanding	$ 25,000	$ 0
Federal Home Loan Bank, advances, branch of FHLB bank, interest rate	5.60%	5.60%
Due in February 2026
Debt Instrument [Line Items]
Long-term debt outstanding	$ 20,000	$ 0
Federal Home Loan Bank, advances, branch of FHLB bank, interest rate	4.51%	4.51%
Due in August 2026
Debt Instrument [Line Items]
Long-term debt outstanding	$ 745	$ 1,088
Federal Home Loan Bank, advances, branch of FHLB bank, interest rate	4.80%	4.80%
Due in February 2027
Debt Instrument [Line Items]
Long-term debt outstanding	$ 26	$ 31
Federal Home Loan Bank, advances, branch of FHLB bank, interest rate	6.71%	6.71%

Subordinated Debt and Trust P_2

Subordinated Debt and Trust Preferred Securities (Details) - USD ($) $ in Thousands					9 Months Ended
	Nov. 30, 2021	Dec. 22, 2020	Mar. 20, 2020	Dec. 19, 2017	Sep. 30, 2023	Dec. 31, 2022
Subordinated debt					$ 46,501	$ 56,941
Subordinated Debt | Subordinated Notes Due 2028
Subordinated debt issuance				$ 10,000
Subordinated Debt | Subordinated Notes Due December 2030
Subordinated debt issuance		$ 12,200
Debt instrument, interest rate, effective percentage		4.50%
Principal amount sold, percent		100%
Interest rate period		5 years
Debt instrument, interest rate, effective percentage		4.50%
Redemption price, percentage		100%
Subordinated Debt | Subordinated Notes Due December 2030 | Related Party
Subordinated debt					750	750
Subordinated Debt | Subordinated Notes Due March 2030
Subordinated debt issuance	$ 6,900		$ 15,000		8,100
Debt instrument, interest rate, effective percentage			4%
Interest rate period			5 years
Debt instrument, interest rate, effective percentage			4.25%
Redemption price, percentage			100%
Interest payment terms, semi-annually			5 years
Subordinated Debt | Subordinated Notes Due March 2030 | Related Party
Subordinated debt					$ 1,700	$ 1,700
Riverview Acquisition | Subordinated Debt
Subordinate debt assumed	25,000
Subordinated debt fair value premium	$ 2,300
Debt instrument, interest rate, effective percentage	5.75%
Debt instrument, basis spread on variable rate	5.63%

Common Stock and Earnings Per_3

Common Stock and Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 19, 2020
Class of Stock [Line Items]
Stock repurchased during period (in shares)	412,722		412,722
Stock repurchased at average price per share (in dollars per share)	$ 22.92		$ 22.92
Number of antidilutive shares			0	0
Employee | Minimum
Class of Stock [Line Items]
Restricted shares, vesting period			1 year
Employee | Maximum
Class of Stock [Line Items]
Restricted shares, vesting period			4 years
Director
Class of Stock [Line Items]
Restricted shares, vesting period			12 months
Dividend Reinvestment Plan
Class of Stock [Line Items]
Shares authorized per plan (in shares)	300,000,000		300,000,000
2023 Stock Incentive Plan
Class of Stock [Line Items]
Aggregate shares granted (in shares)			350,000
Shares granted (in shares)			217,514,000
Granted shares unvested (in shares)	88,519		88,519
Allocated share-based compensation expense	$ 324	$ 237	$ 825	$ 694
Treasury Stock Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount (in shares)					$ 15,000
Stock repurchased during period (in shares)	0
Stock repurchase program, remaining available repurchase amount	$ 5,500		$ 5,500

Common Stock and Earnings Per_4

Common Stock and Earnings Per Share - Schedule of Computing Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]
Net income	$ 9,236	$ 4,836	$ 11,227	$ 15,481	$ 12,252	$ 11,354	$ 25,299	$ 39,087
Weighted average common shares outstanding (basic)	16,571,825			15,877,592			16,233,006	15,922,945
Effect of dilutive unvested restricted stock grants (in shares)	23,174			10,279			31,716	22,329
Weighted average common shares outstanding (diluted)	16,594,999			15,887,871			16,264,722	15,945,274
Basic earnings per common share (In dollars per share)	$ 0.56			$ 0.97			$ 1.56	$ 2.45
Diluted earnings per common share (in dollars per share)	$ 0.56			$ 0.97			$ 1.56	$ 2.45