Nicolet Bankshares (NIC) 10-Q 7 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	001-37700
Entity Registrant Name	NICOLET BANKSHARES, INC
Entity Incorporation, State or Country Code	WI
Entity Tax Identification Number	47-0871001
Entity Address, Address Line One	111 North Washington Street
Entity Address, City or Town	Green Bay,
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	54301
City Area Code	(920)
Local Phone Number	430-1400
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	NIC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		14,761,128
Entity Central Index Key	0001174850
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023		Dec. 31, 2022
Assets
Cash and due from banks	$ 109,414		$ 121,211
Interest-earning deposits	436,466		33,512
Cash and cash equivalents	545,880	[1]	154,723
Certificates of deposit in other banks	7,598		12,518
Securities available for sale (“AFS”), at fair value	793,826		917,618
Securities held to maturity (“HTM”), at amortized cost	0		679,128
Other investments	58,367		65,286
Loans held for sale	6,500		1,482
Loans	6,239,257		6,180,499
Allowance for credit losses - loans (“ACL-Loans”)	(63,160)		(61,829)
Loans, net	6,176,097		6,118,670
Premises and equipment, net	117,744		108,956
Bank owned life insurance (“BOLI”)	168,223		165,137
Goodwill and other intangibles, net	396,208		402,438
Accrued interest receivable and other assets	145,719		138,013
Total assets	8,416,162		8,763,969
Liabilities:
Noninterest-bearing demand deposits	2,020,074		2,361,816
Interest-bearing deposits	5,162,314		4,817,105
Total deposits	7,182,388		7,178,921
Short-term borrowings	0		317,000
Total long-term borrowings	197,754		225,342
Accrued interest payable and other liabilities	61,559		70,177
Total liabilities	7,441,701		7,791,440
Stockholders’ Equity:
Common stock	147		147
Additional paid-in capital	626,348		621,988
Retained earnings	431,317		407,864
Accumulated other comprehensive income (loss)	(83,351)		(57,470)
Total stockholders’ equity	974,461		972,529
Total liabilities and stockholders’ equity	$ 8,416,162		$ 8,763,969
Preferred shares authorized (no par value)	10,000,000		10,000,000
Preferred shares issued and outstanding	0		0
Common shares authorized (par value $0.01 per share)	30,000,000		30,000,000
Common shares outstanding	14,757,565		14,690,614
Common shares issued	14,818,155		14,764,104
[1]There was no restricted cash in cash and cash equivalents at either September 30, 2023 or September 30, 2022.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Common shares authorized, par value (in dollars per share)	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income - 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 loan fees	$ 87,657	$ 63,060	$ 250,890	$ 167,313
Investment securities:
Taxable	4,351	5,350	13,445	15,612
Tax-exempt	1,424	1,181	4,637	2,503
Other interest income	6,452	1,127	10,345	2,734
Total interest income	99,884	70,718	279,317	188,162
Interest expense:
Deposits	34,964	4,638	89,241	9,240
Short-term borrowings	474	594	4,794	622
Long-term borrowings	2,972	2,496	8,048	6,431
Total interest expense	38,410	7,728	102,083	16,293
Net interest income	61,474	62,990	177,234	171,869
Provision for credit losses	450	8,600	3,990	9,650
Net interest income after provision for credit losses	61,024	54,390	173,244	162,219
Noninterest income:
Mortgage income, net	2,020	1,728	5,308	7,186
BOLI income	1,090	966	3,363	2,667
Deferred compensation plan asset market valuations	(457)	(571)	988	(2,354)
LSR income, net	1,108	(517)	3,398	(1,042)
Asset gains (losses), net	31	(46)	(38,755)	2,870
Other income	1,879	1,830	5,611	4,902
Total noninterest income	16,541	13,000	11,538	43,074
Noninterest expense:
Personnel	23,944	24,136	72,172	65,008
Occupancy, equipment and office	9,027	7,641	26,655	21,476
Business development and marketing	1,869	2,281	5,936	6,169
Data processing	4,643	3,664	12,849	10,647
Intangibles amortization	1,986	1,628	6,230	4,399
FDIC assessments	1,500	480	3,049	1,440
Merger-related expense	0	519	189	1,172
Other expense	2,769	2,218	8,490	6,344
Total noninterest expense	45,738	42,567	135,570	116,655
Income before income tax expense	31,827	24,823	49,212	88,638
Income tax expense	14,669	6,313	18,357	21,979
Net income	$ 17,158	$ 18,510	$ 30,855	$ 66,659
Earnings per common share:
Basic (in dollars per share)	$ 1.16	$ 1.33	$ 2.10	$ 4.88
Diluted (in dollars per share)	$ 1.14	$ 1.29	$ 2.05	$ 4.72
Weighted average common shares outstanding:
Basic (in shares)	14,740,319	13,890,066	14,715,588	13,647,973
Diluted (in shares)	15,099,622	14,310,275	15,044,259	14,126,772
Wealth management fee income
Noninterest income:
Fees and commissions	$ 6,057	$ 5,009	$ 17,439	$ 15,700
Service charges on deposit accounts
Noninterest income:
Fees and commissions	1,492	1,589	4,501	4,602
Card interchange income
Noninterest income:
Fees and commissions	$ 3,321	$ 3,012	$ 9,685	$ 8,543

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 17,158	$ 18,510	$ 30,855	$ 66,659
Unrealized gains (losses) on securities AFS:
Net unrealized holding gains (losses)	(21,645)	(26,162)	(12,244)	(89,630)
Net realized (gains) losses included in income	(11)	0	337	(15)
Reclassification adjustment for securities transferred from held to maturity to available for sale	0	0	(20,434)	0
Income tax (expense) benefit	3,574	7,064	6,460	24,204
Total other comprehensive income (loss)	(18,082)	(19,098)	(25,881)	(65,441)
Comprehensive income (loss)	$ (924)	$ (588)	$ 4,974	$ 1,218

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2021	$ 891,891	$ 140	$ 575,045	$ 313,604	$ 3,102
Comprehensive income:
Net income	66,659			66,659
Other comprehensive income (loss)	(65,441)				(65,441)
Issuance of common stock in acquisition	98,149	13	98,136
Stock-based compensation expense	5,282		5,282
Exercise of stock options, net	2,078	1	2,077
Issuance of common stock	557		557
Purchase and retirement of common stock	(60,712)	(7)	(60,705)
Ending Balance at Sep. 30, 2022	938,463	147	620,392	380,263	(62,339)
Beginning Balance at Jun. 30, 2022	839,387	134	520,741	361,753	(43,241)
Comprehensive income:
Net income	18,510			18,510
Other comprehensive income (loss)	(19,098)				(19,098)
Issuance of common stock in acquisition	98,149	13	98,136
Stock-based compensation expense	1,329		1,329
Exercise of stock options, net	1		1
Issuance of common stock	185		185
Ending Balance at Sep. 30, 2022	938,463	147	620,392	380,263	(62,339)
Beginning Balance at Dec. 31, 2022	972,529	147	621,988	407,864	(57,470)
Comprehensive income:
Net income	30,855			30,855
Other comprehensive income (loss)	(25,881)				(25,881)
Stock-based compensation expense	4,829		4,829
Cash dividends on common stock	(7,402)			(7,402)
Exercise of stock options, net	454	1	453
Issuance of common stock	598		598
Purchase and retirement of common stock	(1,521)	(1)	(1,520)
Ending Balance at Sep. 30, 2023	974,461	147	626,348	431,317	(83,351)
Beginning Balance at Jun. 30, 2023	977,638	147	624,897	417,863	(65,269)
Comprehensive income:
Net income	17,158			17,158
Other comprehensive income (loss)	(18,082)				(18,082)
Stock-based compensation expense	1,399		1,399
Cash dividends on common stock	(3,704)			(3,704)
Exercise of stock options, net	(146)		(146)
Issuance of common stock	198		198
Ending Balance at Sep. 30, 2023	$ 974,461	$ 147	$ 626,348	$ 431,317	$ (83,351)

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock (in dollars per share)	$ 0.25	$ 0.50

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Cash Flows From Operating Activities:
Net income		$ 30,855	$ 66,659
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation, amortization, and accretion		13,163	16,994
Provision for credit losses		3,990	9,650
Increase in cash surrender value of life insurance		(3,386)	(2,551)
Stock-based compensation expense		4,829	5,282
Asset (gains) losses, net		38,755	(2,870)
Gain on sale of loans held for sale, net		(3,230)	(4,520)
Net change due to:
Proceeds from sale of loans held for sale		108,991	188,093
Origination of loans held for sale		(111,883)	(182,962)
Accrued interest receivable and other assets		(3,263)	7,719
Accrued interest payable and other liabilities		(8,618)	(14,145)
Net cash provided by (used in) operating activities		70,203	87,349
Cash Flows From Investing Activities:
Net (increase) decrease in loans		(55,042)	(537,001)
Net (increase) decrease in certificates of deposit in other banks		4,920	8,419
Purchases of securities AFS		(20,220)	(8,623)
Purchases of securities HTM		0	(56,479)
Proceeds from sales of securities AFS		28,992	23,984
Proceeds from sales of securities HTM		460,051	0
Proceeds from calls and maturities of securities AFS		256,151	70,781
Proceeds from calls and maturities of securities HTM		2,916	21,378
Purchases of other investments		(12,934)	(30,327)
Proceeds from sales of other investments		18,939	4,014
Proceeds from redemption of BOLI		312	578
Net (increase) decrease in premises and equipment		(15,104)	(7,965)
Net (increase) decrease in other real estate and other assets		1,211	9,785
Net cash (paid) received in branch sale		0	147,833
Net cash (paid) received in business combination		0	(28,221)
Net cash provided by (used in) investing activities		670,192	(381,844)
Cash Flows From Financing Activities:
Net increase (decrease) in deposits		3,633	68,428
Net increase (decrease) in short-term borrowings			147,134
Net increase (decrease) in short-term borrowings		(317,000)
Repayments of long-term borrowings		(28,000)	(20,000)
Purchase and retirement of common stock		(1,521)	(60,712)
Cash dividends paid on common stock		(7,402)	0
Proceeds from issuance of common stock		598	557
Proceeds from exercise of stock options		454	2,078
Net cash provided by (used in) financing activities		(349,238)	137,485
Net increase (decrease) in cash and cash equivalents		391,157	(157,010)
Cash and cash equivalents:
Beginning		154,723	595,292
Ending	[1]	545,880	438,282
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest		99,486	19,785
Cash paid for taxes		22,920	25,660
Transfer of securities from HTM to AFS		177,727	0
Transfer of loans and bank premises to other real estate owned		873	432
Capitalized mortgage servicing rights		1,104	2,127
Acquisitions:
Fair value of assets acquired		0	1,121,000
Fair value of liabilities assumed		0	1,034,000
Net assets acquired		$ 0	$ 87,000
[1]There was no restricted cash in cash and cash equivalents at either September 30, 2023 or September 30, 2022.

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Statement of Cash Flows [Abstract]
Restricted cash and cash equivalents	$ 0	$ 0

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation General In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the consolidated balance sheets, statements of income, comprehensive income (loss), changes in stockholders’ equity, and cash flows of Nicolet Bankshares, Inc. (the “Company” or “Nicolet”) and its subsidiaries, as of and for the periods presented, and all such adjustments are of a normal recurring nature. All material intercompany transactions and balances have been eliminated. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the entire year. These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been omitted or abbreviated. These consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. Critical Accounting Policies and Estimates Preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, assumptions, and judgments that affect the amounts reported in the consolidated financial statements and accompanying disclosures. Estimates are used in accounting for, among other items, the allowance for credit losses, valuation of loans in acquisition transactions, useful lives for depreciation and amortization, fair value of financial instruments, impairment calculations, valuation of deferred tax assets, uncertain income tax positions and contingencies. These estimates are based on management’s knowledge of historical experience, current information, and other factors deemed to be relevant; accordingly, as this information changes, actual results could differ from those estimates. Factors that may cause sensitivity to the aforementioned estimates include but are not limited to: external market factors such as market interest rates and employment rates, changes to operating policies and procedures, changes in applicable banking or tax regulations, and changes to deferred tax estimates. Nicolet considers accounting estimates to be critical to reported financial results if the accounting estimate requires management to make assumptions about matters that are highly uncertain and different estimates that are reasonably likely to occur from period to period, could have a material impact on the financial statements. The accounting estimates we consider to be critical include business combinations and the valuation of loans acquired, the determination of the allowance for credit losses, and income taxes. There have been no material changes or developments with respect to the assumptions or methodologies that the Company uses when applying critical accounting policies and developing critical accounting estimates as disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. Recent Accounting Pronouncements Adopted In March 2022, the FASB issued ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings (“TDRs”) and Vintage Disclosures . This ASU eliminated the accounting guidance for TDRs by creditors and enhanced the disclosure requirements for loan modifications to borrowers experiencing financial difficulty. The ASU also requires public business entities to expand the vintage disclosures to include gross charge-offs by year of origination. The updated guidance is effective for fiscal years beginning after December 15, 2022. Adoption of this ASU did not have a material impact on the Company’s consolidated financial statements; however, it resulted in new disclosures. See Note 6 for the new disclosures. Future Accounting Pronouncements In March 2023, the FASB issued ASU 2023-02, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method . This ASU permits reporting entities to elect to account for tax equity investments, regardless of the tax credit program for which the income tax credits are received, using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense. A reporting entity makes 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. This ASU also requires specific disclosures of investments that generate income tax credits and other income tax benefits from a tax credit program for which the entity has elected to apply the proportional amortization method. The updated guidance is effective for fiscal years beginning after December 15, 2023. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting . This ASU provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. It provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848, which defers the sunset date of the original guidance from December 31, 2022 to December 31, 2024. The Company continues to work through the cessation of LIBOR, including the modification of its loans and other financial instruments with attributes that are either directly or indirectly influenced by LIBOR. The Company expects to utilize the reference rate reform transition guidance, as applicable, and does not expect such adoption to have a material impact on its consolidated financial statements or financial disclosures. Reclassifications Certain amounts in the 2022 consolidated financial statements have been reclassified to conform to the 2023 presentation. These reclassifications were not material and did not impact previously reported net income or comprehensive income.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisition	Acquisition Charter Bankshares, Inc. (“Charter”) : On August 26, 2022, Nicolet completed its merger with Charter, pursuant to the Agreement and Plan of Merger dated March 29, 2022, at which time Charter merged with and into Nicolet, and Charter Bank, the wholly owned bank subsidiary of Charter, was merged with and into Nicolet National Bank (the “Bank”), the wholly owned bank subsidiary of Nicolet. In the merger, Charter stockholders received 15.458 shares of Nicolet common stock and $475 in cash for each share of Charter owned. As a result, Nicolet issued approximately 1.26 million shares of Nicolet common stock for stock consideration of $98 million and cash consideration of $39 million, for a total purchase price of $137 million. With the Charter merger, Nicolet expanded to Western Wisconsin and Minnesota. A summary of the assets acquired and liabilities assumed in the Charter transaction, as of the acquisition date, including the purchase price allocation was as follows. (In millions, except share data) Acquired from Charter Fair Value Adjustments Estimated Fair Value Assets Acquired: Cash and cash equivalents $ 10 $ — $ 10 Investment securities 218 — 218 Loans 848 (21) 827 ACL-Loans (9) 7 (2) Premises and equipment 9 1 10 BOLI 29 — 29 Core deposit intangible — 19 19 Other assets 5 5 10 Total assets $ 1,110 $ 11 $ 1,121 Liabilities Assumed: Deposits $ 869 $ 1 $ 870 Borrowings 161 — 161 Other liabilities 3 — 3 Total liabilities $ 1,033 $ 1 $ 1,034 Net assets acquired $ 87 Purchase Price: Nicolet common stock issued (in shares) 1,262,360 Value of Nicolet common stock consideration $ 98 Cash consideration paid 39 Total purchase price $ 137 Goodwill $ 50 The Company purchased loans through the acquisition of Charter for which there was, at the date of acquisition, more than insignificant deterioration of credit quality since origination (purchased credit deteriorated loans or “PCD” loans). The carrying amount of these loans at acquisition was as follows. (In thousands) August 26, 2022 Purchase price of PCD loans at acquisition $ 24,031 Allowance for credit losses on PCD loans at acquisition 1,709 Par value of PCD acquired loans at acquisition $ 25,740

Earnings per Common Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common Share Basic earnings per common share are calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per common share are calculated by dividing net income by the weighted average number of shares adjusted for the dilutive effect of common stock awards (outstanding stock options and unvested restricted stock), if any. Presented below are the calculations for 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 $ 17,158 $ 18,510 $ 30,855 $ 66,659 Weighted average common shares outstanding 14,740 13,890 14,716 13,648 Effect of dilutive common stock awards 360 420 328 479 Diluted weighted average common shares outstanding 15,100 14,310 15,044 14,127 Basic earnings per common share* $ 1.16 $ 1.33 $ 2.10 $ 4.88 Diluted earnings per common share* $ 1.14 $ 1.29 $ 2.05 $ 4.72 *Cumulative quarterly per share performance may not equal annual per share totals due to the effects of the amount and timing of capital increases. When computing earnings per share for an interim period, the denominator is based on the weighted average shares outstanding during the interim period, and not on an annualized weighted average basis. Accordingly, the sum of the earnings per share data for the quarters will not necessarily equal the year to date earnings per share data.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company may grant stock options and restricted stock under its stock-based compensation plans to certain officers, employees and directors. These plans are administered by a committee of the Board of Directors, and at September 30, 2023, approximately 0.7 million shares were available for grant under these stock-based compensation plans. A Black-Scholes model is utilized to estimate the fair value of stock option grants, while the market price of the Company’s stock at the date of grant is used to estimate the fair value of restricted stock awards. The weighted average assumptions used in the Black-Scholes model for valuing stock option grants were as follows. Nine Months Ended September 30, 2023 2022 Dividend yield 1.6 % — % Expected volatility 30 % 30 % Risk-free interest rate 3.74 % 3.03 % Expected average life 7 years 7 years Weighted average per share fair value of options $ 20.94 $ 30.99 A summary of the Company’s stock option activity is summarized below. Stock Options Option Shares Weighted Weighted Average Aggregate Outstanding - December 31, 2022 1,853,064 $ 59.79 Granted 7,000 64.36 Exercise of stock options * (115,179) 40.02 Forfeited (25,000) 84.98 Outstanding - September 30, 2023 1,719,885 $ 60.76 5.3 $ 20,354 Exercisable - September 30, 2023 1,260,942 $ 55.09 4.5 $ 20,217 * The terms of the stock option agreements permit having a number of shares of stock withheld, the fair market value of which as of the date of exercise is sufficient to satisfy the exercise price and/or tax withholding requirements. For the nine months ended September 30, 2023, 54,517 such shares were withheld by the Company. Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock options. The intrinsic value of options exercised for the nine months ended September 30, 2023 and 2022 was approximately $3.7 million and $3.3 million, respectively. A summary of the Company’s restricted stock activity is summarized below. Restricted Stock Weighted Average Grant Restricted Shares Outstanding - December 31, 2022 $ 76.49 73,490 Granted 55.65 11,674 Vested 66.40 (24,574) Outstanding - September 30, 2023 $ 76.57 60,590 The Company recognized approximately $4.2 million and $4.6 million of stock-based compensation expense (included in personnel on the consolidated statements of income) for the nine months ended September 30, 2023 and 2022, respectively, associated with its common stock awards granted to officers and employees. In addition, for the nine months ended September 30, 2023, the Company recognized approximately $0.6 million of director expense (included in other expense on the consolidated statements of income) for restricted stock grants totaling 11,674 shares with immediate vesting to directors, while for the nine months ended September 30, 2022, the Company recognized approximately $0.7 million of director expense for restricted stock grants totaling 8,852 shares with immediate vesting to directors, in each case representing the annual stock retainer fee paid to external board members for that year. As of September 30, 2023, there was approximately $14.0 million of unrecognized compensation cost related to equity award grants, which is expected to be recognized over the remaining vesting period of approximately three years. The Company recognized a tax benefit of approximately $0.5 million and $0.4 million for the nine months ended September 30, 2023 and 2022, respectively, for the tax impact of stock option exercises and vesting of restricted stock.

Securities and Other Investment

Securities and Other Investments	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Securities and Other Investments	Securities and Other Investments Securities Securities are classified as AFS or HTM on the consolidated balance sheets at the time of purchase. AFS securities include those securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity, and are carried at fair value on the consolidated balance sheets. HTM securities include those securities which the Company has both the positive intent and ability to hold to maturity, and are carried at amortized cost on the consolidated balance sheets. Premiums and discounts on investment securities are amortized or accreted into interest income over the estimated life of the related securities using the effective interest method. The amortized cost and fair value of securities AFS and HTM are summarized as follows. September 30, 2023 (in thousands) Amortized Cost Gross Gross Estimated Fair Value Securities AFS: U.S. Treasury securities $ 42,190 $ — $ 4,686 $ 37,504 U.S. government agency securities 8,293 2 74 8,221 State, county and municipals 387,259 69 45,998 341,330 Mortgage-backed securities 355,906 — 49,497 306,409 Corporate debt securities 111,245 — 10,883 100,362 Total securities AFS $ 904,893 $ 71 $ 111,138 $ 793,826 December 31, 2022 (in thousands) Amortized Cost Gross Gross Estimated Fair Value Securities AFS: U.S. Treasury securities $ 192,116 $ — $ 8,286 $ 183,830 U.S. government agency securities 2,133 — 33 2,100 State, county and municipals 433,733 123 35,668 398,188 Mortgage-backed securities 227,650 10 26,728 200,932 Corporate debt securities 140,712 3 8,147 132,568 Total securities AFS $ 996,344 $ 136 $ 78,862 $ 917,618 Securities HTM: U.S. Treasury securities $ 497,648 $ — $ 35,722 $ 461,926 U.S. government agency securities 8,744 46 — 8,790 State, county and municipals 34,874 — 3,349 31,525 Mortgage-backed securities 137,862 — 16,751 121,111 Total securities HTM $ 679,128 $ 46 $ 55,822 $ 623,352 On March 7, 2023, Nicolet executed the sale of $500 million (par value) U.S. Treasury held to maturity securities for a pre-tax loss of $38 million or an after-tax loss of $28 million. Proceeds from the sale were used to reduce existing FHLB borrowings with the remainder held in investable cash. As a result of the sale of securities previously classified as held to maturity, the remaining unsold portfolio of held to maturity securities, with a book value of $177 million, was reclassified to available for sale with a carrying value of approximately $157 million. The unrealized loss on this portfolio of $20 million (at the time of reclassification) increased the balance of accumulated other comprehensive loss $15 million, net of the deferred tax effect, and is subject to future market changes. Proceeds and realized gains or losses from the sale of AFS and HTM securities were as follows. Nine Months Ended September 30, (in thousands) 2023 2022 Securities AFS: Gross gains $ 268 $ 20 Gross losses (605) (5) Gains (losses) on sales of securities AFS, net $ (337) $ 15 Proceeds from sales of securities AFS $ 28,992 $ 23,984 Securities HTM: Gross gains $ — $ — Gross losses (37,723) — Gains (losses) on sales of securities HTM, net $ (37,723) $ — Proceeds from sales of securities HTM $ 460,051 $ — All mortgage-backed securities included in the securities portfolio were issued by U.S. government agencies and corporations. Investment securities with a carrying value of $345 million and $883 million, as of September 30, 2023 and December 31, 2022, respectively, were pledged as collateral to secure public deposits and borrowings, as applicable, and for liquidity or other purposes as required by regulation. Accrued interest on investment securities totaled $5 million at both September 30, 2023 and December 31, 2022, and is included in accrued interest receivable and other assets on the consolidated balance sheets. The following table presents gross unrealized losses and the related estimated fair value of investment securities for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position. September 30, 2023 Less than 12 months 12 months or more Total ($ in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Number of Securities AFS: U.S. Treasury securities $ — $ — $ 37,504 $ 4,686 $ 37,504 $ 4,686 4 U.S. government agency securities 5,396 32 1,798 42 7,194 74 10 State, county and municipals 66,415 5,460 263,740 40,538 330,155 45,998 710 Mortgage-backed securities 19,959 268 286,450 49,229 306,409 49,497 451 Corporate debt securities 3,336 223 92,607 10,660 95,943 10,883 67 Total $ 95,106 $ 5,983 $ 682,099 $ 105,155 $ 777,205 $ 111,138 1,242 December 31, 2022 Less than 12 months 12 months or more Total ($ in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Number of Securities AFS: U.S. Treasury securities $ 448 $ 14 $ 183,382 $ 8,272 $ 183,830 $ 8,286 9 U.S. government agency securities 2,083 32 17 1 2,100 33 9 State, county and municipals 277,546 18,041 86,569 17,627 364,115 35,668 812 Mortgage-backed securities 102,108 11,320 95,614 15,408 197,722 26,728 376 Corporate debt securities 114,887 6,186 12,938 1,961 127,825 8,147 90 Total $ 497,072 $ 35,593 $ 378,520 $ 43,269 $ 875,592 $ 78,862 1,296 Securities HTM: U.S. Treasury securities $ — $ — $ 461,926 $ 35,722 $ 461,926 $ 35,722 6 State, county and municipals 17,591 1,594 11,654 1,755 29,245 3,349 58 Mortgage-backed securities 68,108 8,029 53,003 8,722 121,111 16,751 106 Total $ 85,699 $ 9,623 $ 526,583 $ 46,199 $ 612,282 $ 55,822 170 During first quarter 2023, the Company recognized provision expense of $2.3 million related to the expected credit loss on its Signature Bank sub debt investment (acquired in an acquisition), and immediately charged-off the full investment. The Company does not consider its remaining securities AFS with unrealized losses to be attributable to credit-related factors, as the unrealized losses in each category have occurred as a result of changes in noncredit-related factors such as changes in interest rates, market spreads and market conditions subsequent to purchase, not credit deterioration. Furthermore, the Company does not have the intent to sell any of these AFS securities and believes that it is more likely than not that we will not have to sell any such securities before a recovery of cost. As of September 30, 2023 and December 31, 2022, no allowance for credit losses on AFS securities was recognized. The Company evaluated the HTM securities and determined no allowance for credit losses was necessary at December 31, 2022. The U.S. Treasury and U.S. government agency securities are guaranteed by the U.S. government. For the state, county and municipal securities, management considered issuer bond ratings, historical loss rates by bond ratings, whether issuers continue to make timely principal and interest payments per the contractual terms of the investment securities, internal forecasts, and whether or not such investment securities provide insurance, other credit enhancement, or are pre-refunded by the issuers. For the mortgage-backed securities, all such securities were issued by U.S. government agencies and corporations, which are currently explicitly or implicitly guaranteed by the U.S. government and have a long history of no credit losses. The amortized cost and fair value of investment securities by contractual maturity are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties; as this is particularly inherent in mortgage-backed securities, these securities are not included in the maturity categories below. As of September 30, 2023 Securities AFS (in thousands) Amortized Cost Fair Value Due in less than one year $ 65,155 $ 64,470 Due in one year through five years 162,719 147,803 Due after five years through ten years 207,337 177,658 Due after ten years 113,776 97,486 548,987 487,417 Mortgage-backed securities 355,906 306,409 Total investment securities $ 904,893 $ 793,826 Other Investments Other investments include “restricted” equity securities, equity securities with readily determinable fair values, and private company securities. As a member of the Federal Reserve Bank System and the Federal Home Loan Bank (“FHLB”) System, Nicolet is required to maintain an investment in the capital stock of these entities. These equity securities are “restricted” in that they can only be sold back to the respective institutions or another member institution at par. Therefore, they are less liquid than other exchange traded equity securities. As no ready market exists for these stocks, and they have no quoted market value, these investments are carried at cost. Also included are investments in other private companies that do not have quoted market prices, which are carried at cost less impairment charges, if any. The carrying value of other investments are summarized as follows. September 30, 2023 December 31, 2022 (in thousands) Amount Amount Federal Reserve Bank stock $ 33,050 $ 32,219 Federal Home Loan Bank (“FHLB”) stock 9,674 18,625 Equity securities with readily determinable fair values 3,893 4,376 Other investments 11,750 10,066 Total other investments $ 58,367 $ 65,286

Loans, Allowance for Credit Los

Loans, Allowance for Credit Losses - Loans, and Credit Quality	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Loans, Allowance for Credit Losses - Loans, and Credit Quality	Loans, Allowance for Credit Losses - Loans, and Credit Quality The loan composition is summarized as follows. September 30, 2023 December 31, 2022 (in thousands) Amount % of Amount % of Commercial & industrial $ 1,237,789 20 % $ 1,304,819 21 % Owner-occupied commercial real estate (“CRE”) 971,397 16 954,599 15 Agricultural 1,108,261 18 1,088,607 18 CRE investment 1,130,938 18 1,149,949 19 Construction & land development 326,747 5 318,600 5 Residential construction 76,289 1 114,392 2 Residential first mortgage 1,136,748 18 1,016,935 16 Residential junior mortgage 195,432 3 177,332 3 Retail & other 55,656 1 55,266 1 Loans 6,239,257 100 % 6,180,499 100 % Less allowance for credit losses - Loans (“ACL-Loans”) 63,160 61,829 Loans, net $ 6,176,097 $ 6,118,670 Allowance for credit losses - Loans to loans 1.01 % 1.00 % Accrued interest on loans totaled $19 million and $15 million at September 30, 2023 and December 31, 2022, respectively, and is included in accrued interest receivable and other assets on the consolidated balance sheets. Allowance for Credit Losses - Loans : The majority of the Company’s loans, commitments, and letters of credit have been granted to customers in the Company’s market area. Although the Company has a diversified loan portfolio, the credit risk in the loan portfolio is largely influenced by general economic conditions and trends of the counties and markets in which the debtors operate, and the resulting impact on the operations of borrowers or on the value of underlying collateral, if any. A roll forward of the allowance for credit losses - loans is summarized as follows. Three Months Ended Nine Months Ended Year Ended (in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 December 31, 2022 Beginning balance $ 62,811 $ 50,655 $ 61,829 $ 49,672 $ 49,672 ACL on PCD loans acquired — 1,709 — 1,709 1,937 Provision for credit losses 450 8,200 1,650 9,100 10,950 Charge-offs (346) (300) (1,091) (442) (1,033) Recoveries 245 84 772 309 303 Net (charge-offs) recoveries (101) (216) (319) (133) (730) Ending balance $ 63,160 $ 60,348 $ 63,160 $ 60,348 $ 61,829 The following tables present the balance and activity in the ACL-Loans by portfolio segment. Nine Months Ended September 30, 2023 (in thousands) Commercial Owner- Agricultural CRE Construction & land Residential Residential Residential Retail Total ACL-Loans Beginning balance $ 16,350 $ 9,138 $ 9,762 $ 12,744 $ 2,572 $ 1,412 $ 6,976 $ 1,846 $ 1,029 $ 61,829 Provision (1,518) 48 2,467 46 96 (484) 336 295 364 1,650 Charge-offs (403) (301) (66) — — — — (96) (225) (1,091) Recoveries 518 241 3 — — — 3 — 7 772 Net (charge-offs) recoveries 115 (60) (63) — — — 3 (96) (218) (319) Ending balance $ 14,947 $ 9,126 $ 12,166 $ 12,790 $ 2,668 $ 928 $ 7,315 $ 2,045 $ 1,175 $ 63,160 As % of ACL-Loans 24 % 14 % 19 % 20 % 4 % 2 % 12 % 3 % 2 % 100 % Year Ended December 31, 2022 (in thousands) Commercial Owner- Agricultural CRE Construction Residential Residential Residential Retail & ACL-Loans Beginning balance $ 12,613 $ 7,222 $ 9,547 $ 8,462 $ 1,812 $ 900 $ 6,844 $ 1,340 $ 932 $ 49,672 ACL on PCD loans 1,408 384 — 38 2 — 93 12 — 1,937 Provision 2,415 2,087 215 4,075 758 512 96 493 299 10,950 Charge-offs (190) (555) — — — — (65) — (223) (1,033) Recoveries 104 — — 169 — — 8 1 21 303 Net (charge-offs) recoveries (86) (555) — 169 — — (57) 1 (202) (730) Ending balance $ 16,350 $ 9,138 $ 9,762 $ 12,744 $ 2,572 $ 1,412 $ 6,976 $ 1,846 $ 1,029 $ 61,829 As % of ACL-Loans 26 % 15 % 16 % 21 % 4 % 2 % 11 % 3 % 2 % 100 % The ACL-Loans represents management’s estimate of expected credit losses in the Company’s loan portfolio at the balance sheet date. To assess the appropriateness of the ACL-Loans, management applies an allocation methodology which focuses on evaluation of qualitative and environmental factors, including but not limited to: (i) evaluation of facts and issues related to specific loans; (ii) management’s ongoing review and grading of the loan portfolio; (iii) consideration of historical loan loss and delinquency experience on each portfolio segment; (iv) trends in past due and nonperforming loans; (v) the risk characteristics of the various loan segments; (vi) changes in the size and character of the loan portfolio; (vii) concentrations of loans to specific borrowers or industries; (viii) existing economic conditions; (ix) the fair value of underlying collateral; and (x) other qualitative and quantitative factors which could affect expected credit losses. Assessing these numerous factors involves significant judgment. Management allocates the ACL-Loans by pools of risk within each loan portfolio segment. The allocation methodology consists of the following components. First, a specific reserve is established for individually evaluated credit-deteriorated loans, which management defines as nonaccrual credit relationships over $250,000, collateral dependent loans, purchased credit deteriorated loans, and other loans with evidence of credit deterioration. The specific reserve in the ACL-Loans for these credit deteriorated loans is equal to the aggregate collateral or discounted cash flow shortfall. Management allocates the ACL-Loans with historical loss rates by loan segment. The loss factors are measured on a quarterly basis and applied to each loan segment based on current loan balances and projected for their expected remaining life. Next, management allocates the ACL-Loans using the qualitative factors mentioned above. Consideration is given to those current qualitative or environmental factors that are likely to cause estimated credit losses as of the evaluation date to differ from the historical loss experience of each loan segment. Lastly, management considers reasonable and supportable forecasts to assess the collectability of future cash flows. Allowance for Credit Losses-Unfunded Commitments : In addition to the ACL-Loans, the Company has established an ACL-Unfunded commitments, classified in accrued interest payable and other liabilities on the consolidated balance sheets. This reserve is maintained at a level that management believes is sufficient to absorb losses arising from unfunded loan commitments, and is determined quarterly based on methodology similar to the methodology for determining the ACL-Loans. The reserve for unfunded commitments was $3.0 million at both September 30, 2023 and December 31, 2022. Provision for Credit Losses : The provision for credit losses is determined by the Company as the amount to be added to the ACL loss accounts for various types of financial instruments including loans, investment securities, and off-balance sheet credit exposures after net charge-offs have been deducted to bring the ACL to a level that, in management’s judgment, is necessary to absorb expected credit losses over the lives of the respective financial instruments. See Note 5 for additional information regarding the ACL related to investment securities. The following table presents the components of the provision for credit losses. Three Months Ended Nine Months Ended Year Ended (in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 December 31, 2022 Provision for credit losses on: Loans $ 450 $ 8,200 $ 1,650 $ 9,100 $ 10,950 Unfunded commitments — 400 — 550 550 Investment securities — — 2,340 — — Total $ 450 $ 8,600 $ 3,990 $ 9,650 $ 11,500 Collateral Dependent Loans : A loan is considered to be collateral dependent when, based upon management’s assessment, the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. For collateral dependent loans, expected credit losses are based on the estimated fair value of the collateral at the balance sheet date, with consideration for estimated selling costs if satisfaction of the loan depends on the sale of the collateral. The following tables present collateral dependent loans by portfolio segment and collateral type, including those loans with and without a related allowance allocation. September 30, 2023 Collateral Type (in thousands) Real Estate Other Business Assets Total Without an Allowance With an Allowance Allowance Allocation Commercial & industrial $ — $ 3,402 $ 3,402 $ 2,351 $ 1,051 $ 230 Owner-occupied CRE 4,827 — 4,827 4,827 — — Agricultural 7,629 5,811 13,440 8,530 4,910 123 CRE investment 942 — 942 552 390 19 Construction & land development — — — — — — Residential first mortgage 686 — 686 686 — — Residential junior mortgage — — — — — — Total loans $ 14,084 $ 9,213 $ 23,297 $ 16,946 $ 6,351 $ 372 December 31, 2022 Collateral Type (in thousands) Real Estate Other Business Assets Total Without an Allowance With an Allowance Allowance Allocation Commercial & industrial $ — $ 3,475 $ 3,475 $ 1,927 $ 1,548 $ 595 Owner-occupied CRE 4,907 — 4,907 4,699 208 53 Agricultural 13,758 6,458 20,216 14,358 5,858 261 CRE investment 2,713 — 2,713 979 1,734 212 Construction & land development 670 — 670 670 — — Residential first mortgage 91 — 91 91 — — Total loans $ 22,139 $ 9,933 $ 32,072 $ 22,724 $ 9,348 $ 1,121 Past Due and Nonaccrual Loans : The following tables present past due loans by portfolio segment. September 30, 2023 (in thousands) 30-89 Days Past 90 Days & Over or nonaccrual Current Total Commercial & industrial $ 281 $ 5,192 $ 1,232,316 $ 1,237,789 Owner-occupied CRE 76 5,602 965,719 971,397 Agricultural 151 13,458 1,094,652 1,108,261 CRE investment 240 1,100 1,129,598 1,130,938 Construction & land development 23 177 326,547 326,747 Residential construction — — 76,289 76,289 Residential first mortgage 1,710 3,812 1,131,226 1,136,748 Residential junior mortgage 67 92 195,273 195,432 Retail & other 729 74 54,853 55,656 Total loans $ 3,277 $ 29,507 $ 6,206,473 $ 6,239,257 Percent of total loans 0.1 % 0.5 % 99.4 % 100.0 % December 31, 2022 (in thousands) 30-89 Days Past 90 Days & Over or nonaccrual Current Total Commercial & industrial $ 210 $ 3,328 $ 1,301,281 $ 1,304,819 Owner-occupied CRE 833 5,647 948,119 954,599 Agricultural 20 20,416 1,068,171 1,088,607 CRE investment — 3,832 1,146,117 1,149,949 Construction & land development — 771 317,829 318,600 Residential construction — — 114,392 114,392 Residential first mortgage 3,628 3,780 1,009,527 1,016,935 Residential junior mortgage 236 224 176,872 177,332 Retail & other 261 82 54,923 55,266 Total loans $ 5,188 $ 38,080 $ 6,137,231 $ 6,180,499 Percent of total loans 0.1 % 0.6 % 99.3 % 100.0 % The following table presents nonaccrual loans by portfolio segment. September 30, 2023 December 31, 2022 (in thousands) Nonaccrual Loans % of Total Nonaccrual Loans % of Total Commercial & industrial $ 5,192 17 % $ 3,328 9 % Owner-occupied CRE 5,602 19 5,647 15 Agricultural 13,458 46 20,416 53 CRE investment 1,100 4 3,832 10 Construction & land development 177 1 771 2 Residential construction — — — — Residential first mortgage 3,812 13 3,780 10 Residential junior mortgage 92 — 224 1 Retail & other 74 — 82 — Nonaccrual loans $ 29,507 100 % $ 38,080 100 % Percent of total loans 0.5 % 0.6 % Credit Quality Information : The following tables present total loans by risk categories and gross charge-offs by year of origination. Acquired loans have been included based upon the actual origination date. September 30, 2023 Amortized Cost Basis by Origination Year (in thousands) 2023 2022 2021 2020 2019 Prior Revolving Revolving to Term TOTAL Commercial & industrial Grades 1-4 $ 152,385 $ 254,446 $ 184,778 $ 73,488 $ 53,351 $ 96,269 $ 334,059 $ — $ 1,148,776 Grade 5 5,350 10,296 6,779 2,908 1,246 7,364 24,477 — 58,420 Grade 6 — 591 612 194 4 1,028 1,850 — 4,279 Grade 7 4,444 4,600 2,653 2,372 1,952 7,205 3,088 — 26,314 Total $ 162,179 $ 269,933 $ 194,822 $ 78,962 $ 56,553 $ 111,866 $ 363,474 $ — $ 1,237,789 Current period gross charge-offs $ — $ (77) $ (114) $ — $ — $ (197) $ (15) $ — $ (403) Owner-occupied CRE Grades 1-4 $ 101,687 $ 157,461 $ 186,745 $ 98,057 $ 90,223 $ 277,024 $ 3,114 $ — $ 914,311 Grade 5 949 3,754 9,854 5,362 1,481 15,158 212 — 36,770 Grade 6 — — 348 1,545 605 150 — — 2,648 Grade 7 — 218 1,024 6,916 354 8,861 295 — 17,668 Total $ 102,636 $ 161,433 $ 197,971 $ 111,880 $ 92,663 $ 301,193 $ 3,621 $ — $ 971,397 Current period gross charge-offs $ — $ — $ — $ — $ — $ (301) $ — $ — $ (301) Agricultural Grades 1-4 $ 72,777 $ 282,254 $ 136,796 $ 80,960 $ 23,694 $ 144,223 $ 252,202 $ — $ 992,906 Grade 5 2,809 11,201 6,003 725 384 33,751 14,316 — 69,189 Grade 6 — 134 1,114 — 51 2,293 207 — 3,799 Grade 7 3,851 6,898 6,455 492 1,865 14,764 8,042 — 42,367 Total $ 79,437 $ 300,487 $ 150,368 $ 82,177 $ 25,994 $ 195,031 $ 274,767 $ — $ 1,108,261 Current period gross charge-offs $ — $ — $ — $ — $ — $ (66) $ — $ — $ (66) CRE investment Grades 1-4 $ 27,123 $ 183,799 $ 247,563 $ 172,237 $ 117,114 $ 294,916 $ 11,445 $ — $ 1,054,197 Grade 5 2,802 7,859 14,857 8,634 10,066 21,927 49 — 66,194 Grade 6 — — — — — 1,357 65 — 1,422 Grade 7 — 55 21 — 1,043 8,006 — — 9,125 Total $ 29,925 $ 191,713 $ 262,441 $ 180,871 $ 128,223 $ 326,206 $ 11,559 $ — $ 1,130,938 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Construction & land development Grades 1-4 $ 37,180 $ 153,809 $ 88,212 $ 9,610 $ 5,288 $ 28,329 $ 2,070 $ — $ 324,498 Grade 5 — 26 127 1,275 508 89 — — 2,025 Grade 6 — — — — — — — — — Grade 7 47 — — — — 92 85 — 224 Total $ 37,227 $ 153,835 $ 88,339 $ 10,885 $ 5,796 $ 28,510 $ 2,155 $ — $ 326,747 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential construction Grades 1-4 $ 35,996 $ 32,539 $ 5,279 $ 1,101 $ 125 $ 1,209 $ 40 $ — $ 76,289 Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Total $ 35,996 $ 32,539 $ 5,279 $ 1,101 $ 125 $ 1,209 $ 40 $ — $ 76,289 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential first mortgage Grades 1-4 $ 125,176 $ 377,475 $ 256,628 $ 134,035 $ 59,281 $ 168,739 $ 614 $ 3 $ 1,121,951 Grade 5 — 1,296 1,259 1,262 2,538 2,684 — — 9,039 Grade 6 — — — — — — — — — Grade 7 — 150 467 485 1,074 3,582 — — 5,758 Total $ 125,176 $ 378,921 $ 258,354 $ 135,782 $ 62,893 $ 175,005 $ 614 $ 3 $ 1,136,748 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential junior mortgage Grades 1-4 $ 12,538 $ 7,607 $ 3,915 $ 4,360 $ 2,848 $ 4,110 $ 153,322 $ 6,446 $ 195,146 Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — 32 202 — — 14 38 — 286 Total $ 12,538 $ 7,639 $ 4,117 $ 4,360 $ 2,848 $ 4,124 $ 153,360 $ 6,446 $ 195,432 Current period gross charge-offs $ — $ — $ — $ — $ — $ (96) $ — $ — $ (96) Retail & other Grades 1-4 $ 7,281 $ 8,932 $ 6,202 $ 2,925 $ 2,045 $ 4,042 $ 24,107 $ — $ 55,534 Grade 5 — — 18 — — — — — 18 Grade 6 — — — — — — — — — Grade 7 — — 26 10 1 67 — — 104 Total $ 7,281 $ 8,932 $ 6,246 $ 2,935 $ 2,046 $ 4,109 $ 24,107 $ — $ 55,656 Current period gross charge-offs $ (6) $ (1) $ — $ (1) $ — $ (52) $ (165) $ — $ (225) Total loans $ 592,395 $ 1,505,432 $ 1,167,937 $ 608,953 $ 377,141 $ 1,147,253 $ 833,697 $ 6,449 $ 6,239,257 December 31, 2022 Amortized Cost Basis by Origination Year (in thousands) 2022 2021 2020 2019 2018 Prior Revolving Revolving to Term TOTAL Commercial & industrial Grades 1-4 $ 317,394 $ 226,065 $ 101,374 $ 68,884 $ 50,189 $ 77,589 $ 360,978 $ — $ 1,202,473 Grade 5 9,938 5,902 10,811 1,530 3,986 4,562 20,617 — 57,346 Grade 6 1,459 2,283 629 511 402 11,653 14,047 — 30,984 Grade 7 556 293 3,211 2,990 775 1,070 5,121 — 14,016 Total $ 329,347 $ 234,543 $ 116,025 $ 73,915 $ 55,352 $ 94,874 $ 400,763 $ — $ 1,304,819 Current period gross charge-offs $ (38) $ (41) $ (2) $ — $ (109) $ — $ — $ — $ (190) Owner-occupied CRE Grades 1-4 $ 151,391 $ 190,313 $ 105,156 $ 100,606 $ 91,479 $ 252,574 $ 6,734 $ — $ 898,253 Grade 5 5,241 3,192 4,287 2,163 4,791 14,632 348 — 34,654 Grade 6 — — 763 2,361 — 877 — — 4,001 Grade 7 227 706 6,344 616 — 9,798 — — 17,691 Total $ 156,859 $ 194,211 $ 116,550 $ 105,746 $ 96,270 $ 277,881 $ 7,082 $ — $ 954,599 Current period gross charge-offs $ — $ — $ — $ — $ — $ (555) $ — $ — $ (555) Agricultural Grades 1-4 $ 275,208 $ 145,272 $ 85,413 $ 25,463 $ 19,687 $ 130,849 $ 249,033 $ — $ 930,925 Grade 5 13,295 18,178 2,694 1,992 517 43,927 21,199 — 101,802 Grade 6 115 1,457 28 33 — 5,258 429 — 7,320 Grade 7 7,165 2,632 720 1,977 4,611 19,948 11,507 — 48,560 Total $ 295,783 $ 167,539 $ 88,855 $ 29,465 $ 24,815 $ 199,982 $ 282,168 $ — $ 1,088,607 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — CRE investment Grades 1-4 $ 205,930 $ 229,252 $ 192,527 $ 134,301 $ 79,649 $ 248,595 $ 11,383 $ — $ 1,101,637 Grade 5 567 1,649 3,578 4,266 3,086 24,897 — — 38,043 Grade 6 — — — 1,170 2,396 2,483 206 — 6,255 Grade 7 — — 121 299 245 3,140 209 — 4,014 Total $ 206,497 $ 230,901 $ 196,226 $ 140,036 $ 85,376 $ 279,115 $ 11,798 $ — $ 1,149,949 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Construction & land development Grades 1-4 $ 104,804 $ 140,727 $ 12,188 $ 9,747 $ 23,811 $ 13,138 $ 13,235 $ — $ 317,650 Grade 5 37 — — 14 — 95 — — 146 Grade 6 — — — — — — — — — Grade 7 33 — — — — 771 — — 804 Total $ 104,874 $ 140,727 $ 12,188 $ 9,761 $ 23,811 $ 14,004 $ 13,235 $ — $ 318,600 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential construction Grades 1-4 $ 92,417 $ 16,774 $ 966 $ 123 $ 336 $ 229 $ 3,547 $ — $ 114,392 Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Total $ 92,417 $ 16,774 $ 966 $ 123 $ 336 $ 229 $ 3,547 $ — $ 114,392 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential first mortgage Grades 1-4 $ 318,628 $ 272,011 $ 147,857 $ 68,975 $ 31,208 $ 162,153 $ 2,080 $ 3 $ 1,002,915 Grade 5 1,494 758 997 1,803 2,272 465 — — 7,789 Grade 6 — — — 711 — — — — 711 Grade 7 154 329 188 349 197 4,303 — — 5,520 Total $ 320,276 $ 273,098 $ 149,042 $ 71,838 $ 33,677 $ 166,921 $ 2,080 $ 3 $ 1,016,935 Current period gross charge-offs $ — $ — $ — $ — $ — $ (65) $ — $ — $ (65) Residential junior mortgage Grades 1-4 $ 10,119 $ 4,580 $ 5,207 $ 3,151 $ 1,573 $ 3,409 $ 142,784 $ 5,762 $ 176,585 Grade 5 — — — — — 143 165 — 308 Grade 6 — — — — — — — — — Grade 7 — 206 — — — 24 209 — 439 Total $ 10,119 $ 4,786 $ 5,207 $ 3,151 $ 1,573 $ 3,576 $ 143,158 $ 5,762 $ 177,332 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Retail & other Grades 1-4 $ 12,318 $ 8,957 $ 4,221 $ 3,188 $ 1,035 $ 24,950 $ 492 $ — $ 55,161 Grade 5 — 23 — — — — — — 23 Grade 6 — — — — — — — — — Grade 7 — 23 22 2 30 5 — — 82 Total $ 12,318 $ 9,003 $ 4,243 $ 3,190 $ 1,065 $ 24,955 $ 492 $ — $ 55,266 Current period gross charge-offs $ — $ (1) $ (6) $ (1) $ — $ — $ (215) $ — $ (223) Total loans $ 1,528,490 $ 1,271,582 $ 689,302 $ 437,225 $ 322,275 $ 1,061,537 $ 864,323 $ 5,765 $ 6,180,499 An internal loan review function rates loans using a grading system based on different risk categories. Loans with a Substandard grade are considered to have a greater risk of loss and may be assigned allocations for loss based on specific review of the weaknesses observed in the individual credits. Such loans are monitored by the loan review function to help ensure early identification of any deterioration. A description of the loan risk categories used by the Company follows. Grades 1-4, Pass: Credits exhibit adequate cash flows, appropriate management and financial ratios within industry norms and/or are supported by sufficient collateral. Some credits in these rating categories may require a need for monitoring but elements of concern are not severe enough to warrant an elevated rating. Grade 5, Watch: Credits with this rating are adequately secured and performing but are being monitored due to the presence of various short-term weaknesses which may include unexpected, short-term adverse financial performance, managerial problems, potential impact of a decline in the entire industry or local economy and delinquency issues. Loans to individuals or loans supported by guarantors with marginal net worth or collateral may be included in this rating category. Grade 6, Special Mention: Credits with this rating have potential weaknesses that, without the Company’s attention and correction may result in deterioration of repayment prospects. These assets are considered Criticized Assets. Potential weaknesses may include adverse financial trends for the borrower or industry, repeated lack of compliance with Company requests, increasing debt to net worth, serious management conditions and decreasing cash flow. Grade 7, Substandard: Assets with this rating are characterized by the distinct possibility the Company will sustain some loss if deficiencies are not corrected. All foreclosures, liquidations, and nonaccrual loans are considered to be categorized in this rating, regardless of collateral sufficiency. Modifications to Borrowers Experiencing Financial Difficulty : On January 1, 2023, the Company adopted ASU 2022-02, which eliminated the accounting guidance for TDRs by creditors and enhanced the disclosure requirements for certain loan modifications to borrowers experiencing financial difficulty. The following table presents the amortized cost of loans that were both experiencing financial difficulty and were modified during the nine months ended September 30, 2023, aggregated by portfolio segment and type of modification. (in thousands) Payment Delay Term Extension Interest Rate Reduction Term Extension & Interest Rate Reduction Total % of Total Loans Commercial & industrial $ 433 $ — $ 87 $ — $ 520 0.04 % Owner-occupied CRE — — — — — — % Agricultural 107 — — — 107 0.01 % CRE investment — — — — — — % Construction & land development — — — — — — % Residential first mortgage — — — — — — % Total $ 540 $ — $ 87 $ — $ 627 0.01 % The loans presented in the table above have had more than insignificant payment delays (which the Company has defined as payment delays in excess of three months). These modified loans are closely monitored by the Company to understand the effectiveness of its modification efforts, and such loans generally remain in nonaccrual status pending a sustained period of performance in accordance with the modified terms. As of September 30, 2023, there were no loans made to borrowers experiencing financial difficulty that were modified during the current period and subsequently defaulted, and there were no commitments to lend additional funds to such debtors. Troubled Debt Restructuring Disclosures Prior to Adoption of ASU 2022-02 : As of December 31, 2022, the Company had restructured loans totaling $18 million, with a pre-modification balance of $24 million, all of which were also reflected as nonaccrual loans. There were no restructured loans modified during 2022 that subsequently defaulted, and there were no commitments to lend additional funds to such debtors.

Goodwill and Other Intangibles

Goodwill and Other Intangibles and Servicing Rights	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles and Servicing Rights	Goodwill and Other Intangibles and Servicing Rights Management periodically reviews the carrying value of its intangible assets to determine if any impairment has occurred, in which case an impairment charge would be recorded as an expense in the period of impairment, or whether changes in circumstances have occurred that would require a revision to the remaining useful life that would affect expense prospectively. In making such determination, management evaluates whether there are any adverse qualitative factors indicating that an impairment may exist, as well as the performance of the underlying operations or assets which give rise to the intangible. Management also regularly monitors economic factors for potential impairment indications on the value of our franchise, stability of deposits, and the wealth client base, underlying our goodwill and other intangibles. Management concluded no impairment was indicated for the nine months ended September 30, 2023 and the year ended December 31, 2022. A summary of goodwill and other intangibles was as follows. (in thousands) September 30, 2023 December 31, 2022 Goodwill $ 367,387 $ 367,387 Core deposit intangibles 26,842 32,701 Customer list intangibles 1,979 2,350 Other intangibles 28,821 35,051 Goodwill and other intangibles, net $ 396,208 $ 402,438 Goodwill : A summary of goodwill was as follows. During 2022, goodwill increased due to the Charter acquisition. Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Goodwill: Goodwill at beginning of year $ 367,387 $ 317,189 Acquisitions — 49,970 Purchase accounting adjustment — 228 Goodwill at end of period $ 367,387 $ 367,387 Other intangible assets : Other intangible assets, consisting of core deposit intangibles and customer list intangibles, are amortized over their estimated finite lives. A summary of other intangible assets was as follows. During 2022, core deposit intangibles increased due to the Charter acquisition. Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Core deposit intangibles: Gross carrying amount $ 60,724 $ 60,724 Accumulated amortization (33,882) (28,023) Net book value $ 26,842 $ 32,701 Additions during the period $ — $ 19,364 Amortization during the period $ 5,859 $ 6,108 Customer list intangibles: Gross carrying amount $ 5,523 $ 5,523 Accumulated amortization (3,544) (3,173) Net book value $ 1,979 $ 2,350 Amortization during the period $ 371 $ 508 Mortgage servicing rights (“MSR”) : Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date, with the amortization recorded in mortgage income, net, in the consolidated statements of income. Mortgage servicing rights are carried at the lower of the initial capitalized amount, net of accumulated amortization, or estimated fair value, and are included in other assets in the consolidated balance sheets. The Company periodically evaluates its mortgage servicing rights asset for impairment. At each reporting date, impairment is assessed based on estimated fair value using estimated prepayment speeds of the underlying mortgage loans serviced and stratification based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). A summary of the changes in the mortgage servicing rights asset was as follows. Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Mortgage servicing rights asset: MSR asset at beginning of year $ 13,080 $ 13,636 Capitalized MSR 1,104 2,327 Amortization during the period (2,248) (2,883) MSR asset at end of period $ 11,936 $ 13,080 Valuation allowance at beginning of year $ (500) $ (1,200) Reversals 500 700 Valuation allowance at end of period $ — $ (500) MSR asset, net $ 11,936 $ 12,580 Fair value of MSR asset at end of period $ 15,847 $ 17,215 Residential mortgage loans serviced for others $ 1,610,318 $ 1,637,109 Net book value of MSR asset to loans serviced for others 0.74 % 0.77 % Loan servicing rights (“LSR”) : The Company acquired an LSR asset in December 2021 which will be amortized over the estimated remaining loan service period. The Company does not expect to add new loans to this servicing portfolio. A summary of the changes in the LSR asset were as follows. Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Loan servicing rights asset: LSR asset at beginning of year $ 11,039 $ 20,055 Amortization during the period (1,656) (9,016) LSR asset at end of period $ 9,383 $ 11,039 Agricultural loans serviced for others $ 502,901 $ 538,392 The following table shows the estimated future amortization expense for amortizing intangible assets and the servicing assets. The projections are based on existing asset balances, the current interest rate environment and estimated prepayment speeds as of September 30, 2023. The actual amortization expense the Company recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements and events or circumstances that indicate the carrying amount of an asset may not be recoverable. (in thousands) Core deposit Customer list MSR asset LSR asset Year ending December 31, 2023 (remaining three months) $ 1,730 $ 112 $ 687 $ 552 2024 6,298 449 2,661 1,962 2025 5,161 449 1,978 1,717 2026 3,983 249 1,457 1,472 2027 3,218 166 1,457 1,227 2028 2,622 166 1,456 981 Thereafter 3,830 388 2,240 1,472 Total $ 26,842 $ 1,979 $ 11,936 $ 9,383

Short and Long-Term Borrowings

Short and Long-Term Borrowings	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Short and Long-Term Borrowings	Short and Long-Term Borrowings Short-Term Borrowings: Short-term borrowings include any borrowing with an original maturity of one year or less. The Company did not have any short-term borrowings outstanding at September 30, 2023. At December 31, 2022, short-term borrowings included $317 million of short-term FHLB advances, comprised of $117 million due in January 2023 at a weighted average rate of 4.29% and $200 million due in September 2023 at a weighted average rate of 4.30%. Long-Term Borrowings: Long-term borrowings include any borrowing with an original maturity greater than one year. The components of long-term borrowings were as follows. (in thousands) September 30, 2023 December 31, 2022 FHLB advances $ 5,000 $ 33,000 Junior subordinated debentures 40,344 39,720 Subordinated notes 152,410 152,622 Total long-term borrowings $ 197,754 $ 225,342 FHLB Advances : The Federal Home Loan Bank (“FHLB”) advance bears a fixed rate, requires interest-only monthly payments, and has a maturity date of March 2025. The weighted average rate of the FHLB advances was 1.55% at September 30, 2023 and 1.09% at December 31, 2022. Junior Subordinated Debentures : Each of the junior subordinated debentures was issued to an underlying statutory trust (the “statutory trusts”), which issued trust preferred securities and common securities and used the proceeds from the issuance of the common and the trust preferred securities to purchase the junior subordinated debentures of the Company. The debentures represent the sole asset of the statutory trusts. All of the common securities of the statutory trusts are owned by the Company. The statutory trusts are not included in the consolidated financial statements. The net effect of all the documents entered into with respect to the trust preferred securities is that the Company, through payments on its debentures, is liable for the distributions and other payments required on the trust preferred securities. Interest on all debentures is current. Any applicable discounts (initially recorded to carry an acquired debenture at its then estimated fair value) are being accreted to interest expense over the remaining life of the debenture. All the junior subordinated debentures are currently callable and may be redeemed in part or in full, at par, plus any accrued but unpaid interest. At September 30, 2023 and December 31, 2022, approximately $39 million and $38 million, respectively, of trust preferred securities qualify as Tier 1 capital. Subordinated Notes (the “Notes”) : In July 2021, the Company completed the private placement of $100 million in fixed-to-floating rate subordinated notes due in 2031, with a fixed annual rate of 3.125% for the first five years, and will reset quarterly thereafter to the then current three-month Secured Overnight Financing Rate (“SOFR”) plus 237.5 basis points. The Notes due in 2031 are redeemable beginning July 15, 2026 and quarterly thereafter on any interest payment date. In December 2021, Nicolet assumed two subordinated note issuances at a premium as the result of an acquisition. One issuance was $30 million in fixed-to-floating rate subordinated notes due in 2028, with a fixed annual interest rate of 5.875% for the first five years, and will reset quarterly thereafter to the then current three-month SOFR, as adjusted for the LIBOR to SOFR spread adjustment, plus 2.88%. The Company intends to redeem these notes on the next interest payment date in fourth quarter 2023. The second issuance was $22 million in fixed-to-floating rate subordinated notes due in 2030, with a fixed annual interest rate of 7.00% for the first five years, and will reset quarterly thereafter to the then current SOFR plus 687.5 basis points. The Notes due in 2028 are redeemable beginning June 1, 2023, and quarterly thereafter on any interest payment date, while the Notes due in 2030 are redeemable beginning June 30, 2025, and quarterly thereafter on any interest payment date. All Notes qualify as Tier 2 capital for regulatory purposes, and are discounted in accordance with regulations when the debt has five years or less remaining to maturity. The following table shows the breakdown of junior subordinated debentures and subordinated notes. As of September 30, 2023 As of December 31, 2022 (in thousands) Maturity Interest Par Unamortized Premium /(Discount) / Debt Issue Costs (1) Carrying Interest Carrying Junior Subordinated Debentures: Mid-Wisconsin Statutory Trust I (2) 12/15/2035 7.10 % $ 10,310 $ (2,429) $ 7,881 6.20 % $ 7,734 Baylake Capital Trust II (3) 9/30/2036 7.01 % 16,598 (2,997) 13,601 6.08 % 13,424 First Menasha Statutory Trust (4) 3/17/2034 8.46 % 5,155 (454) 4,701 7.53 % 4,668 County Bancorp Statutory Trust II (5) 9/15/2035 7.20 % 6,186 (792) 5,394 6.30 % 5,277 County Bancorp Statutory Trust III (6) 6/15/2036 7.36 % 6,186 (850) 5,336 6.46 % 5,219 Fox River Valley Capital Trust (7) 5/30/2033 6.40 % 3,610 (179) 3,431 6.40 % 3,398 Total $ 48,045 $ (7,701) $ 40,344 $ 39,720 Subordinated Notes: Subordinated Notes due 2031 7/15/2031 3.13 % $ 100,000 $ (576) $ 99,424 3.13 % $ 99,267 County Subordinated Notes due 2028 6/1/2028 8.56 % 30,000 — 30,000 5.88 % 30,119 County Subordinated Notes due 2030 6/30/2030 7.00 % 22,400 586 22,986 7.00 % 23,236 Total $ 152,400 $ 10 $ 152,410 $ 152,622 (1) Represents the remaining unamortized premium or discount on debt issuances assumed in acquisitions, and represents the unamortized debt issue costs for the debt issued directly by Nicolet. (2) The debentures, assumed in April 2013 as the result of an acquisition, have a floating rate of three-month SOFR plus 1.43%, adjusted quarterly. * (3) The debentures, assumed in April 2016 as a result of an acquisition, have a floating rate of three-month SOFR plus 1.35%, adjusted quarterly. * (4) The debentures, assumed in April 2017 as the result of an acquisition, have a floating rate of three-month SOFR plus 2.79%, adjusted quarterly. * (5) The debentures, assumed in December 2021 as the result of an acquisition, have a floating rate of three-month SOFR plus 1.53%, adjusted quarterly. * (6) The debentures, assumed in December 2021 as the result of an acquisition, have a floating rate of three-month SOFR plus 1.69%, adjusted quarterly. * (7) The debentures, assumed in December 2021 as the result of an acquisition, have a floating rate of 5-year swap rate plus 3.40%, which resets every five years. * The floating rate on this debenture was originally based on three-month LIBOR. Effective with the cessation of LIBOR, the floating rate on this debenture is now based on three-month CME Term SOFR, plus the spread adjustment of 0.26161%.

Commitment and Contingencies

Commitment and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, financial guarantees, and standby letters of credit. Such commitments may involve, to varying degrees, elements of credit risk in excess of amounts recognized on the consolidated balance sheets. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instruments for commitments to extend credit and standby letters of credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and issuing letters of credit as they do for on-balance sheet financial instruments. See Note 6 for information on the allowance for credit losses-unfunded commitments. A summary of the contract or notional amount of the Company’s exposure to off-balance sheet risk was as follows. (in thousands) September 30, 2023 December 31, 2022 Commitments to extend credit $ 1,810,068 $ 1,850,601 Financial standby letters of credit 18,235 26,530 Performance standby letters of credit 15,814 9,375 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, and predominantly included commercial lines of credit with a term of one year or less. The commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Financial and performance standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Financial standby letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party, while performance standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party. Both of these guarantees are primarily issued to support public and private borrowing arrangements and, generally, have terms of one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Company holds collateral, which may include accounts receivable, inventory, property, equipment, and income-producing properties, supporting those commitments if deemed necessary. In the event the customer does not perform in accordance with the terms of the agreement with the third-party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount. If the commitment is funded, the Company would be entitled to seek recovery from the customer. Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans held for sale are considered derivative instruments (“mortgage derivatives”) and the contractual amounts were $16 million and $17 million, respectively, at September 30, 2023. In comparison, interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans held for sale totaled $9 million and $9 million, respectively, at December 31, 2022. The net fair value of these mortgage derivatives combined was a net gain of $0.2 million and $0.1 million at September 30, 2023 and December 31, 2022, respectively. Nicolet is party to various pending and threatened claims and legal proceedings arising in the normal course of business activities, some of which may involve claims for substantial amounts. Although Nicolet has developed policies and procedures to minimize legal noncompliance and the impact of claims and other proceedings and endeavored to procure reasonable amounts of insurance coverage, litigation and regulatory actions present an ongoing risk. With respect to all such claims, Nicolet continuously assesses its potential liability based on the allegations and evidence available. If the facts indicate that it is probable that Nicolet will incur a loss and the amount of such loss can be reasonably estimated, Nicolet will establish an accrual for the probable loss. For matters where a loss is not probable, or the amount of the loss cannot be reasonably estimated, Nicolet does not establish an accrual. Future developments could result in an unfavorable outcome for or resolution of any one or more of the legal proceedings in which Nicolet is a defendant, which may be material to Nicolet’s business or consolidated results of operations or financial condition for a particular fiscal period or periods. Although it is not possible to predict the outcome of any of these legal proceedings or the range of possible loss, if any, based on the most recent information available, advice of counsel and available insurance coverage, if applicable, management believes that any liability resulting from such proceedings would not have a material adverse effect on our financial position or results of operations.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value represents the estimated price at which an orderly transaction to sell an asset or transfer a liability would take place between market participants at the measurement date under current market conditions (i.e., an exit price concept), and is a market-based measurement versus an entity-specific measurement. The Company records and/or discloses certain financial instruments on a fair value basis. These financial assets and financial liabilities are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the assumptions used to determine fair value. Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from independent sources. Unobservable inputs are inputs that reflect assumptions of the reporting entity about how market participants would price the asset or liability based on the best information available under the circumstances. The three fair value levels are: • Level 1 – quoted market prices in active markets for identical assets or liabilities that a company has the ability to access at the measurement date • Level 2 – inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly • Level 3 – significant unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity In instances where the fair value measurement is based on inputs from different levels, the level within which the entire fair value measurement will be categorized is based on the lowest level input that is significant to the fair value measurement in its entirety. This assessment of the significance of an input requires management judgment. Recurring basis fair value measurements: The following table presents the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Recurring Basis: Total Level 1 Level 2 Level 3 September 30, 2023 U.S. Treasury securities $ 37,504 $ — $ 37,504 $ — U.S. government agency securities 8,221 — 8,221 — State, county and municipals 341,330 — 339,949 1,381 Mortgage-backed securities 306,409 — 305,438 971 Corporate debt securities 100,362 — 97,064 3,298 Securities AFS $ 793,826 $ — $ 788,176 $ 5,650 Other investments (equity securities) $ 3,893 $ 3,893 $ — $ — Derivative assets $ 186 $ — $ — $ 186 Derivative liabilities $ — $ — $ — $ — December 31, 2022 U.S. Treasury securities $ 183,830 $ — $ 183,830 $ — U.S. government agency securities 2,100 — 2,100 — State, county and municipals 398,188 — 396,315 1,873 Mortgage-backed securities 200,932 — 199,951 981 Corporate debt securities 132,568 — 127,269 5,299 Securities AFS $ 917,618 $ — $ 909,465 $ 8,153 Other investments (equity securities) $ 4,376 $ 4,376 $ — $ — Derivative assets $ 60 $ — $ — $ 60 Derivative liabilities $ 10 $ — $ — $ 10 The following is a description of the valuation methodologies used by the Company for the assets and liabilities measured at fair value on a recurring basis, noted in the tables above. Securities AFS : Where quoted market prices on securities exchanges are available, the investments are classified as Level 1. Level 1 investments primarily include exchange-traded equity securities. If quoted market prices are not available, fair value is generally determined using prices obtained from independent pricing vendors who use pricing models (with typical inputs including benchmark yields, reported trades for similar securities, issuer spreads or relationship to other benchmark quoted securities), or discounted cash flows, and are classified as Level 2. Examples of these investments include U.S. Treasury securities, U.S. government agency securities, mortgage-backed securities, obligations of state, county and municipals, and certain corporate debt securities. Finally, in certain cases where there is limited activity or less transparency around inputs to the estimated fair value, investments are classified within Level 3 of the hierarchy. Examples of these include private corporate debt securities, which are primarily trust preferred security investments, as well as certain municipal bonds and mortgage-backed securities. At September 30, 2023 and December 31, 2022, it was determined that carrying value was the best approximation of fair value for these Level 3 securities, based primarily on the internal analysis on these securities. Derivatives : The derivative assets and liabilities include interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans held for sale, which are considered derivative instruments (“mortgage derivatives”). The fair value of interest rate lock commitments are determined using the projected sale price of individual loans based on changes in the market interest rates, projected pull-through rates (the probability that an interest rate lock commitment will ultimately result in an originated loan), the reduction in the value of the applicant’s option due to the passage of time, and the remaining origination costs to be incurred based on management’s estimate of market costs. The fair value of forward commitments are determined using quoted prices of to-be-announced securities in active markets, or benchmarked to such securities. The derivative assets and liabilities are classified with Level 3 of the hierarchy. The following table presents the changes in Level 3 securities AFS measured at fair value on a recurring basis. (in thousands) Nine Months Ended Year Ended Level 3 Fair Value Measurements: September 30, 2023 December 31, 2022 Balance at beginning of year $ 8,153 $ 8,065 Acquired balance — 750 Maturities / Paydowns (2,469) (451) Unrealized gain / (loss) (34) (211) Balance at end of period $ 5,650 $ 8,153 Nonrecurring basis fair value measurements: The following table presents the Company’s assets measured at fair value on a nonrecurring basis, aggregated by level in the fair value hierarchy within which those measurements fall. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Nonrecurring Basis: Total Level 1 Level 2 Level 3 September 30, 2023 Collateral dependent loans $ 22,925 $ — $ — $ 22,925 Other real estate owned (“OREO”) 2,031 — — 2,031 MSR asset 11,936 — — 11,936 December 31, 2022 Collateral dependent loans $ 30,951 $ — $ — $ 30,951 OREO 1,975 — — 1,975 MSR asset 12,580 — — 12,580 The following is a description of the valuation methodologies used by the Company for the items noted in the table above. For collateral dependent loans, the estimated fair value is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral with consideration for estimated selling costs if satisfaction of the loan depends on the sale of the collateral, or the estimated liquidity of the note. For OREO, the fair value is based upon the estimated fair value of the underlying collateral adjusted for the expected costs to sell. To estimate the fair value of the MSR asset, the underlying serviced loan pools are stratified by interest rate tranche and term of the loan, and a valuation model is used to calculate the present value of the expected future cash flows for each stratum. The servicing valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as costs to service, a discount rate, ancillary income, default rates and losses, and prepayment speeds. Although some of these assumptions are based on observable market data, other assumptions are based on unobservable estimates of what market participants would use to measure fair value. Financial instruments: The carrying amounts and estimated fair values of the Company’s financial instruments are shown below. September 30, 2023 (in thousands) Carrying Estimated Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 545,880 $ 545,880 $ 545,880 $ — $ — Certificates of deposit in other banks 7,598 7,519 — 7,519 — Securities AFS 793,826 793,826 — 788,176 5,650 Other investments, including equity securities 58,367 58,367 3,893 43,973 10,501 Loans held for sale 6,500 6,641 — 6,641 — Loans, net 6,176,097 5,908,160 — — 5,908,160 MSR asset 11,936 15,847 — — 15,847 LSR asset 9,383 9,383 — — 9,383 Accrued interest receivable 24,166 24,166 24,166 — — Financial liabilities: Deposits $ 7,182,388 $ 7,164,174 $ — $ — $ 7,164,174 Short-term borrowings — — — — — Long-term borrowings 197,754 190,738 — 4,736 186,002 Accrued interest payable 7,028 7,028 7,028 — — December 31, 2022 (in thousands) Carrying Estimated Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 154,723 $ 154,723 $ 154,723 $ — $ — Certificates of deposit in other banks 12,518 12,407 — 12,407 — Securities AFS 917,618 917,618 — 909,465 8,153 Securities HTM 679,128 623,352 — 623,352 — Other investments, including equity securities 65,286 65,286 4,376 52,093 8,817 Loans held for sale 1,482 1,529 — 1,529 — Loans, net 6,118,670 5,863,570 — — 5,863,570 MSR asset 12,580 17,215 — — 17,215 LSR asset 11,039 11,039 — — 11,039 Accrued interest receivable 21,275 21,275 21,275 — — Financial liabilities: Deposits $ 7,178,921 $ 7,172,779 $ — $ — $ 7,172,779 Short-term borrowings 317,000 317,000 317,000 — — Long-term borrowings 225,342 220,513 — 33,001 187,512 Accrued interest payable 4,265 4,265 4,265 — — The valuation methodologies for the financial instruments disclosed in the above table are described in Note 18, Fair Value Measurements, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 2, 2023, Nicolet sold its member interest in UFS, LLC, for proceeds of $10 million and a pre-tax gain of approximately $9 million. This gain on sale will be realized during fourth quarter 2023.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income	$ 17,158	$ 18,510	$ 30,855	$ 66,659

Insider Trading Arrangements

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

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
General	General In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the consolidated balance sheets, statements of income, comprehensive income (loss), changes in stockholders’ equity, and cash flows of Nicolet Bankshares, Inc. (the “Company” or “Nicolet”) and its subsidiaries, as of and for the periods presented, and all such adjustments are of a normal recurring nature. All material intercompany transactions and balances have been eliminated. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the entire year. These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) have been omitted or abbreviated. These consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.
Critical Accounting Policies and Estimates	Critical Accounting Policies and Estimates Preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, assumptions, and judgments that affect the amounts reported in the consolidated financial statements and accompanying disclosures. Estimates are used in accounting for, among other items, the allowance for credit losses, valuation of loans in acquisition transactions, useful lives for depreciation and amortization, fair value of financial instruments, impairment calculations, valuation of deferred tax assets, uncertain income tax positions and contingencies. These estimates are based on management’s knowledge of historical experience, current information, and other factors deemed to be relevant; accordingly, as this information changes, actual results could differ from those estimates. Factors that may cause sensitivity to the aforementioned estimates include but are not limited to: external market factors such as market interest rates and employment rates, changes to operating policies and procedures, changes in applicable banking or tax regulations, and changes to deferred tax estimates. Nicolet considers accounting estimates to be critical to reported financial results if the accounting estimate requires management to make assumptions about matters that are highly uncertain and different estimates that are reasonably likely to occur from period to period, could have a material impact on the financial statements. The accounting estimates we consider to be critical include business combinations and the valuation of loans acquired, the determination of the allowance for credit losses, and income taxes. There have been no material changes or developments with respect to the assumptions or methodologies that the Company uses when applying critical accounting policies and developing critical accounting estimates as disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.
Recent Accounting Pronouncements Adopted and Future Accounting Pronouncements	Recent Accounting Pronouncements Adopted In March 2022, the FASB issued ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings (“TDRs”) and Vintage Disclosures . This ASU eliminated the accounting guidance for TDRs by creditors and enhanced the disclosure requirements for loan modifications to borrowers experiencing financial difficulty. The ASU also requires public business entities to expand the vintage disclosures to include gross charge-offs by year of origination. The updated guidance is effective for fiscal years beginning after December 15, 2022. Adoption of this ASU did not have a material impact on the Company’s consolidated financial statements; however, it resulted in new disclosures. See Note 6 for the new disclosures. Future Accounting Pronouncements In March 2023, the FASB issued ASU 2023-02, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method . This ASU permits reporting entities to elect to account for tax equity investments, regardless of the tax credit program for which the income tax credits are received, using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense. A reporting entity makes 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. This ASU also requires specific disclosures of investments that generate income tax credits and other income tax benefits from a tax credit program for which the entity has elected to apply the proportional amortization method. The updated guidance is effective for fiscal years beginning after December 15, 2023. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting . This ASU provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. It provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848,
Reclassifications	Reclassifications Certain amounts in the 2022 consolidated financial statements have been reclassified to conform to the 2023 presentation. These reclassifications were not material and did not impact previously reported net income or comprehensive income.
Allowance for Credit Losses - Loans	The ACL-Loans represents management’s estimate of expected credit losses in the Company’s loan portfolio at the balance sheet date. To assess the appropriateness of the ACL-Loans, management applies an allocation methodology which focuses on evaluation of qualitative and environmental factors, including but not limited to: (i) evaluation of facts and issues related to specific loans; (ii) management’s ongoing review and grading of the loan portfolio; (iii) consideration of historical loan loss and delinquency experience on each portfolio segment; (iv) trends in past due and nonperforming loans; (v) the risk characteristics of the various loan segments; (vi) changes in the size and character of the loan portfolio; (vii) concentrations of loans to specific borrowers or industries; (viii) existing economic conditions; (ix) the fair value of underlying collateral; and (x) other qualitative and quantitative factors which could affect expected credit losses. Assessing these numerous factors involves significant judgment. Management allocates the ACL-Loans by pools of risk within each loan portfolio segment. The allocation methodology consists of the following components. First, a specific reserve is established for individually evaluated credit-deteriorated loans, which management defines as nonaccrual credit relationships over $250,000, collateral dependent loans, purchased credit deteriorated loans, and other loans with evidence of credit deterioration. The specific reserve in the ACL-Loans for these credit deteriorated loans is equal to the aggregate collateral or discounted cash flow shortfall. Management allocates the ACL-Loans with historical loss rates by loan segment. The loss factors are measured on a quarterly basis and applied to each loan segment based on current loan balances and projected for their expected remaining life. Next, management allocates the ACL-Loans using the qualitative factors mentioned above. Consideration is given to those current qualitative or environmental factors that are likely to cause estimated credit losses as of the evaluation date to differ from the historical loss experience of each loan segment. Lastly, management considers reasonable and supportable forecasts to assess the collectability of future cash flows.

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of the Assets Acquired and Liabilities Assumed Including Purchase Price Allocation	A summary of the assets acquired and liabilities assumed in the Charter transaction, as of the acquisition date, including the purchase price allocation was as follows. (In millions, except share data) Acquired from Charter Fair Value Adjustments Estimated Fair Value Assets Acquired: Cash and cash equivalents $ 10 $ — $ 10 Investment securities 218 — 218 Loans 848 (21) 827 ACL-Loans (9) 7 (2) Premises and equipment 9 1 10 BOLI 29 — 29 Core deposit intangible — 19 19 Other assets 5 5 10 Total assets $ 1,110 $ 11 $ 1,121 Liabilities Assumed: Deposits $ 869 $ 1 $ 870 Borrowings 161 — 161 Other liabilities 3 — 3 Total liabilities $ 1,033 $ 1 $ 1,034 Net assets acquired $ 87 Purchase Price: Nicolet common stock issued (in shares) 1,262,360 Value of Nicolet common stock consideration $ 98 Cash consideration paid 39 Total purchase price $ 137 Goodwill $ 50 (In thousands) August 26, 2022 Purchase price of PCD loans at acquisition $ 24,031 Allowance for credit losses on PCD loans at acquisition 1,709 Par value of PCD acquired loans at acquisition $ 25,740

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Common Share	Presented below are the calculations for 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 $ 17,158 $ 18,510 $ 30,855 $ 66,659 Weighted average common shares outstanding 14,740 13,890 14,716 13,648 Effect of dilutive common stock awards 360 420 328 479 Diluted weighted average common shares outstanding 15,100 14,310 15,044 14,127 Basic earnings per common share* $ 1.16 $ 1.33 $ 2.10 $ 4.88 Diluted earnings per common share* $ 1.14 $ 1.29 $ 2.05 $ 4.72 *Cumulative quarterly per share performance may not equal annual per share totals due to the effects of the amount and timing of capital increases. When computing earnings per share for an interim period, the denominator is based on the weighted average shares outstanding during the interim period, and not on an annualized weighted average basis. Accordingly, the sum of the earnings per share data for the quarters will not necessarily equal the year to date earnings per share data.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Weighted Average Assumption for Stock Option	The weighted average assumptions used in the Black-Scholes model for valuing stock option grants were as follows. Nine Months Ended September 30, 2023 2022 Dividend yield 1.6 % — % Expected volatility 30 % 30 % Risk-free interest rate 3.74 % 3.03 % Expected average life 7 years 7 years Weighted average per share fair value of options $ 20.94 $ 30.99
Schedule of Stock Options Activity	A summary of the Company’s stock option activity is summarized below. Stock Options Option Shares Weighted Weighted Average Aggregate Outstanding - December 31, 2022 1,853,064 $ 59.79 Granted 7,000 64.36 Exercise of stock options * (115,179) 40.02 Forfeited (25,000) 84.98 Outstanding - September 30, 2023 1,719,885 $ 60.76 5.3 $ 20,354 Exercisable - September 30, 2023 1,260,942 $ 55.09 4.5 $ 20,217 * The terms of the stock option agreements permit having a number of shares of stock withheld, the fair market value of which as of the date of exercise is sufficient to satisfy the exercise price and/or tax withholding requirements. For the nine months ended September 30, 2023, 54,517 such shares were withheld by the Company.
Schedule of Restricted Stock Activity	A summary of the Company’s restricted stock activity is summarized below. Restricted Stock Weighted Average Grant Restricted Shares Outstanding - December 31, 2022 $ 76.49 73,490 Granted 55.65 11,674 Vested 66.40 (24,574) Outstanding - September 30, 2023 $ 76.57 60,590

Securities and Other Investme_2

Securities and Other Investments (Tables)	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Securities AFS	The amortized cost and fair value of securities AFS and HTM are summarized as follows. September 30, 2023 (in thousands) Amortized Cost Gross Gross Estimated Fair Value Securities AFS: U.S. Treasury securities $ 42,190 $ — $ 4,686 $ 37,504 U.S. government agency securities 8,293 2 74 8,221 State, county and municipals 387,259 69 45,998 341,330 Mortgage-backed securities 355,906 — 49,497 306,409 Corporate debt securities 111,245 — 10,883 100,362 Total securities AFS $ 904,893 $ 71 $ 111,138 $ 793,826 December 31, 2022 (in thousands) Amortized Cost Gross Gross Estimated Fair Value Securities AFS: U.S. Treasury securities $ 192,116 $ — $ 8,286 $ 183,830 U.S. government agency securities 2,133 — 33 2,100 State, county and municipals 433,733 123 35,668 398,188 Mortgage-backed securities 227,650 10 26,728 200,932 Corporate debt securities 140,712 3 8,147 132,568 Total securities AFS $ 996,344 $ 136 $ 78,862 $ 917,618 Securities HTM: U.S. Treasury securities $ 497,648 $ — $ 35,722 $ 461,926 U.S. government agency securities 8,744 46 — 8,790 State, county and municipals 34,874 — 3,349 31,525 Mortgage-backed securities 137,862 — 16,751 121,111 Total securities HTM $ 679,128 $ 46 $ 55,822 $ 623,352
Schedule of Amortized Cost and Fair Value of Securities HTM	The amortized cost and fair value of securities AFS and HTM are summarized as follows. September 30, 2023 (in thousands) Amortized Cost Gross Gross Estimated Fair Value Securities AFS: U.S. Treasury securities $ 42,190 $ — $ 4,686 $ 37,504 U.S. government agency securities 8,293 2 74 8,221 State, county and municipals 387,259 69 45,998 341,330 Mortgage-backed securities 355,906 — 49,497 306,409 Corporate debt securities 111,245 — 10,883 100,362 Total securities AFS $ 904,893 $ 71 $ 111,138 $ 793,826 December 31, 2022 (in thousands) Amortized Cost Gross Gross Estimated Fair Value Securities AFS: U.S. Treasury securities $ 192,116 $ — $ 8,286 $ 183,830 U.S. government agency securities 2,133 — 33 2,100 State, county and municipals 433,733 123 35,668 398,188 Mortgage-backed securities 227,650 10 26,728 200,932 Corporate debt securities 140,712 3 8,147 132,568 Total securities AFS $ 996,344 $ 136 $ 78,862 $ 917,618 Securities HTM: U.S. Treasury securities $ 497,648 $ — $ 35,722 $ 461,926 U.S. government agency securities 8,744 46 — 8,790 State, county and municipals 34,874 — 3,349 31,525 Mortgage-backed securities 137,862 — 16,751 121,111 Total securities HTM $ 679,128 $ 46 $ 55,822 $ 623,352
Schedule of Proceeds and Realized Gains or Losses from the Sale of AFS and HTM Securities	Proceeds and realized gains or losses from the sale of AFS and HTM securities were as follows. Nine Months Ended September 30, (in thousands) 2023 2022 Securities AFS: Gross gains $ 268 $ 20 Gross losses (605) (5) Gains (losses) on sales of securities AFS, net $ (337) $ 15 Proceeds from sales of securities AFS $ 28,992 $ 23,984 Securities HTM: Gross gains $ — $ — Gross losses (37,723) — Gains (losses) on sales of securities HTM, net $ (37,723) $ — Proceeds from sales of securities HTM $ 460,051 $ —
Schedule of Unrealized Losses and Fair Value of Investment Securities	The following table presents gross unrealized losses and the related estimated fair value of investment securities for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position. September 30, 2023 Less than 12 months 12 months or more Total ($ in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Number of Securities AFS: U.S. Treasury securities $ — $ — $ 37,504 $ 4,686 $ 37,504 $ 4,686 4 U.S. government agency securities 5,396 32 1,798 42 7,194 74 10 State, county and municipals 66,415 5,460 263,740 40,538 330,155 45,998 710 Mortgage-backed securities 19,959 268 286,450 49,229 306,409 49,497 451 Corporate debt securities 3,336 223 92,607 10,660 95,943 10,883 67 Total $ 95,106 $ 5,983 $ 682,099 $ 105,155 $ 777,205 $ 111,138 1,242 December 31, 2022 Less than 12 months 12 months or more Total ($ in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Number of Securities AFS: U.S. Treasury securities $ 448 $ 14 $ 183,382 $ 8,272 $ 183,830 $ 8,286 9 U.S. government agency securities 2,083 32 17 1 2,100 33 9 State, county and municipals 277,546 18,041 86,569 17,627 364,115 35,668 812 Mortgage-backed securities 102,108 11,320 95,614 15,408 197,722 26,728 376 Corporate debt securities 114,887 6,186 12,938 1,961 127,825 8,147 90 Total $ 497,072 $ 35,593 $ 378,520 $ 43,269 $ 875,592 $ 78,862 1,296 Securities HTM: U.S. Treasury securities $ — $ — $ 461,926 $ 35,722 $ 461,926 $ 35,722 6 State, county and municipals 17,591 1,594 11,654 1,755 29,245 3,349 58 Mortgage-backed securities 68,108 8,029 53,003 8,722 121,111 16,751 106 Total $ 85,699 $ 9,623 $ 526,583 $ 46,199 $ 612,282 $ 55,822 170
Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturity	The amortized cost and fair value of investment securities by contractual maturity are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties; as this is particularly inherent in mortgage-backed securities, these securities are not included in the maturity categories below. As of September 30, 2023 Securities AFS (in thousands) Amortized Cost Fair Value Due in less than one year $ 65,155 $ 64,470 Due in one year through five years 162,719 147,803 Due after five years through ten years 207,337 177,658 Due after ten years 113,776 97,486 548,987 487,417 Mortgage-backed securities 355,906 306,409 Total investment securities $ 904,893 $ 793,826
Schedule of Carrying Value of other Investments	The carrying value of other investments are summarized as follows. September 30, 2023 December 31, 2022 (in thousands) Amount Amount Federal Reserve Bank stock $ 33,050 $ 32,219 Federal Home Loan Bank (“FHLB”) stock 9,674 18,625 Equity securities with readily determinable fair values 3,893 4,376 Other investments 11,750 10,066 Total other investments $ 58,367 $ 65,286

Loans, Allowance for Credit L_2

Loans, Allowance for Credit Losses - Loans, and Credit Quality (Tables)	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Schedule of Loan Composition	The loan composition is summarized as follows. September 30, 2023 December 31, 2022 (in thousands) Amount % of Amount % of Commercial & industrial $ 1,237,789 20 % $ 1,304,819 21 % Owner-occupied commercial real estate (“CRE”) 971,397 16 954,599 15 Agricultural 1,108,261 18 1,088,607 18 CRE investment 1,130,938 18 1,149,949 19 Construction & land development 326,747 5 318,600 5 Residential construction 76,289 1 114,392 2 Residential first mortgage 1,136,748 18 1,016,935 16 Residential junior mortgage 195,432 3 177,332 3 Retail & other 55,656 1 55,266 1 Loans 6,239,257 100 % 6,180,499 100 % Less allowance for credit losses - Loans (“ACL-Loans”) 63,160 61,829 Loans, net $ 6,176,097 $ 6,118,670 Allowance for credit losses - Loans to loans 1.01 % 1.00 %
Schedule of Allowance for Credit Losses	A roll forward of the allowance for credit losses - loans is summarized as follows. Three Months Ended Nine Months Ended Year Ended (in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 December 31, 2022 Beginning balance $ 62,811 $ 50,655 $ 61,829 $ 49,672 $ 49,672 ACL on PCD loans acquired — 1,709 — 1,709 1,937 Provision for credit losses 450 8,200 1,650 9,100 10,950 Charge-offs (346) (300) (1,091) (442) (1,033) Recoveries 245 84 772 309 303 Net (charge-offs) recoveries (101) (216) (319) (133) (730) Ending balance $ 63,160 $ 60,348 $ 63,160 $ 60,348 $ 61,829 The following tables present the balance and activity in the ACL-Loans by portfolio segment. Nine Months Ended September 30, 2023 (in thousands) Commercial Owner- Agricultural CRE Construction & land Residential Residential Residential Retail Total ACL-Loans Beginning balance $ 16,350 $ 9,138 $ 9,762 $ 12,744 $ 2,572 $ 1,412 $ 6,976 $ 1,846 $ 1,029 $ 61,829 Provision (1,518) 48 2,467 46 96 (484) 336 295 364 1,650 Charge-offs (403) (301) (66) — — — — (96) (225) (1,091) Recoveries 518 241 3 — — — 3 — 7 772 Net (charge-offs) recoveries 115 (60) (63) — — — 3 (96) (218) (319) Ending balance $ 14,947 $ 9,126 $ 12,166 $ 12,790 $ 2,668 $ 928 $ 7,315 $ 2,045 $ 1,175 $ 63,160 As % of ACL-Loans 24 % 14 % 19 % 20 % 4 % 2 % 12 % 3 % 2 % 100 % Year Ended December 31, 2022 (in thousands) Commercial Owner- Agricultural CRE Construction Residential Residential Residential Retail & ACL-Loans Beginning balance $ 12,613 $ 7,222 $ 9,547 $ 8,462 $ 1,812 $ 900 $ 6,844 $ 1,340 $ 932 $ 49,672 ACL on PCD loans 1,408 384 — 38 2 — 93 12 — 1,937 Provision 2,415 2,087 215 4,075 758 512 96 493 299 10,950 Charge-offs (190) (555) — — — — (65) — (223) (1,033) Recoveries 104 — — 169 — — 8 1 21 303 Net (charge-offs) recoveries (86) (555) — 169 — — (57) 1 (202) (730) Ending balance $ 16,350 $ 9,138 $ 9,762 $ 12,744 $ 2,572 $ 1,412 $ 6,976 $ 1,846 $ 1,029 $ 61,829 As % of ACL-Loans 26 % 15 % 16 % 21 % 4 % 2 % 11 % 3 % 2 % 100 %
Schedule of Provision for Credit Losses	The following table presents the components of the provision for credit losses. Three Months Ended Nine Months Ended Year Ended (in thousands) September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 December 31, 2022 Provision for credit losses on: Loans $ 450 $ 8,200 $ 1,650 $ 9,100 $ 10,950 Unfunded commitments — 400 — 550 550 Investment securities — — 2,340 — — Total $ 450 $ 8,600 $ 3,990 $ 9,650 $ 11,500
Schedule of Collateral Dependent Loans by Portfolio Segment	The following tables present collateral dependent loans by portfolio segment and collateral type, including those loans with and without a related allowance allocation. September 30, 2023 Collateral Type (in thousands) Real Estate Other Business Assets Total Without an Allowance With an Allowance Allowance Allocation Commercial & industrial $ — $ 3,402 $ 3,402 $ 2,351 $ 1,051 $ 230 Owner-occupied CRE 4,827 — 4,827 4,827 — — Agricultural 7,629 5,811 13,440 8,530 4,910 123 CRE investment 942 — 942 552 390 19 Construction & land development — — — — — — Residential first mortgage 686 — 686 686 — — Residential junior mortgage — — — — — — Total loans $ 14,084 $ 9,213 $ 23,297 $ 16,946 $ 6,351 $ 372 December 31, 2022 Collateral Type (in thousands) Real Estate Other Business Assets Total Without an Allowance With an Allowance Allowance Allocation Commercial & industrial $ — $ 3,475 $ 3,475 $ 1,927 $ 1,548 $ 595 Owner-occupied CRE 4,907 — 4,907 4,699 208 53 Agricultural 13,758 6,458 20,216 14,358 5,858 261 CRE investment 2,713 — 2,713 979 1,734 212 Construction & land development 670 — 670 670 — — Residential first mortgage 91 — 91 91 — — Total loans $ 22,139 $ 9,933 $ 32,072 $ 22,724 $ 9,348 $ 1,121
Schedule of Past Due Loans by Portfolio Segment	The following tables present past due loans by portfolio segment. September 30, 2023 (in thousands) 30-89 Days Past 90 Days & Over or nonaccrual Current Total Commercial & industrial $ 281 $ 5,192 $ 1,232,316 $ 1,237,789 Owner-occupied CRE 76 5,602 965,719 971,397 Agricultural 151 13,458 1,094,652 1,108,261 CRE investment 240 1,100 1,129,598 1,130,938 Construction & land development 23 177 326,547 326,747 Residential construction — — 76,289 76,289 Residential first mortgage 1,710 3,812 1,131,226 1,136,748 Residential junior mortgage 67 92 195,273 195,432 Retail & other 729 74 54,853 55,656 Total loans $ 3,277 $ 29,507 $ 6,206,473 $ 6,239,257 Percent of total loans 0.1 % 0.5 % 99.4 % 100.0 % December 31, 2022 (in thousands) 30-89 Days Past 90 Days & Over or nonaccrual Current Total Commercial & industrial $ 210 $ 3,328 $ 1,301,281 $ 1,304,819 Owner-occupied CRE 833 5,647 948,119 954,599 Agricultural 20 20,416 1,068,171 1,088,607 CRE investment — 3,832 1,146,117 1,149,949 Construction & land development — 771 317,829 318,600 Residential construction — — 114,392 114,392 Residential first mortgage 3,628 3,780 1,009,527 1,016,935 Residential junior mortgage 236 224 176,872 177,332 Retail & other 261 82 54,923 55,266 Total loans $ 5,188 $ 38,080 $ 6,137,231 $ 6,180,499 Percent of total loans 0.1 % 0.6 % 99.3 % 100.0 %
Schedule of Nonaccrual Loans by Portfolio Segment	The following table presents nonaccrual loans by portfolio segment. September 30, 2023 December 31, 2022 (in thousands) Nonaccrual Loans % of Total Nonaccrual Loans % of Total Commercial & industrial $ 5,192 17 % $ 3,328 9 % Owner-occupied CRE 5,602 19 5,647 15 Agricultural 13,458 46 20,416 53 CRE investment 1,100 4 3,832 10 Construction & land development 177 1 771 2 Residential construction — — — — Residential first mortgage 3,812 13 3,780 10 Residential junior mortgage 92 — 224 1 Retail & other 74 — 82 — Nonaccrual loans $ 29,507 100 % $ 38,080 100 % Percent of total loans 0.5 % 0.6 %
Schedule of Loans by Risk Categories and Gross Charge-offs	The following tables present total loans by risk categories and gross charge-offs by year of origination. Acquired loans have been included based upon the actual origination date. September 30, 2023 Amortized Cost Basis by Origination Year (in thousands) 2023 2022 2021 2020 2019 Prior Revolving Revolving to Term TOTAL Commercial & industrial Grades 1-4 $ 152,385 $ 254,446 $ 184,778 $ 73,488 $ 53,351 $ 96,269 $ 334,059 $ — $ 1,148,776 Grade 5 5,350 10,296 6,779 2,908 1,246 7,364 24,477 — 58,420 Grade 6 — 591 612 194 4 1,028 1,850 — 4,279 Grade 7 4,444 4,600 2,653 2,372 1,952 7,205 3,088 — 26,314 Total $ 162,179 $ 269,933 $ 194,822 $ 78,962 $ 56,553 $ 111,866 $ 363,474 $ — $ 1,237,789 Current period gross charge-offs $ — $ (77) $ (114) $ — $ — $ (197) $ (15) $ — $ (403) Owner-occupied CRE Grades 1-4 $ 101,687 $ 157,461 $ 186,745 $ 98,057 $ 90,223 $ 277,024 $ 3,114 $ — $ 914,311 Grade 5 949 3,754 9,854 5,362 1,481 15,158 212 — 36,770 Grade 6 — — 348 1,545 605 150 — — 2,648 Grade 7 — 218 1,024 6,916 354 8,861 295 — 17,668 Total $ 102,636 $ 161,433 $ 197,971 $ 111,880 $ 92,663 $ 301,193 $ 3,621 $ — $ 971,397 Current period gross charge-offs $ — $ — $ — $ — $ — $ (301) $ — $ — $ (301) Agricultural Grades 1-4 $ 72,777 $ 282,254 $ 136,796 $ 80,960 $ 23,694 $ 144,223 $ 252,202 $ — $ 992,906 Grade 5 2,809 11,201 6,003 725 384 33,751 14,316 — 69,189 Grade 6 — 134 1,114 — 51 2,293 207 — 3,799 Grade 7 3,851 6,898 6,455 492 1,865 14,764 8,042 — 42,367 Total $ 79,437 $ 300,487 $ 150,368 $ 82,177 $ 25,994 $ 195,031 $ 274,767 $ — $ 1,108,261 Current period gross charge-offs $ — $ — $ — $ — $ — $ (66) $ — $ — $ (66) CRE investment Grades 1-4 $ 27,123 $ 183,799 $ 247,563 $ 172,237 $ 117,114 $ 294,916 $ 11,445 $ — $ 1,054,197 Grade 5 2,802 7,859 14,857 8,634 10,066 21,927 49 — 66,194 Grade 6 — — — — — 1,357 65 — 1,422 Grade 7 — 55 21 — 1,043 8,006 — — 9,125 Total $ 29,925 $ 191,713 $ 262,441 $ 180,871 $ 128,223 $ 326,206 $ 11,559 $ — $ 1,130,938 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Construction & land development Grades 1-4 $ 37,180 $ 153,809 $ 88,212 $ 9,610 $ 5,288 $ 28,329 $ 2,070 $ — $ 324,498 Grade 5 — 26 127 1,275 508 89 — — 2,025 Grade 6 — — — — — — — — — Grade 7 47 — — — — 92 85 — 224 Total $ 37,227 $ 153,835 $ 88,339 $ 10,885 $ 5,796 $ 28,510 $ 2,155 $ — $ 326,747 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential construction Grades 1-4 $ 35,996 $ 32,539 $ 5,279 $ 1,101 $ 125 $ 1,209 $ 40 $ — $ 76,289 Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Total $ 35,996 $ 32,539 $ 5,279 $ 1,101 $ 125 $ 1,209 $ 40 $ — $ 76,289 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential first mortgage Grades 1-4 $ 125,176 $ 377,475 $ 256,628 $ 134,035 $ 59,281 $ 168,739 $ 614 $ 3 $ 1,121,951 Grade 5 — 1,296 1,259 1,262 2,538 2,684 — — 9,039 Grade 6 — — — — — — — — — Grade 7 — 150 467 485 1,074 3,582 — — 5,758 Total $ 125,176 $ 378,921 $ 258,354 $ 135,782 $ 62,893 $ 175,005 $ 614 $ 3 $ 1,136,748 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential junior mortgage Grades 1-4 $ 12,538 $ 7,607 $ 3,915 $ 4,360 $ 2,848 $ 4,110 $ 153,322 $ 6,446 $ 195,146 Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — 32 202 — — 14 38 — 286 Total $ 12,538 $ 7,639 $ 4,117 $ 4,360 $ 2,848 $ 4,124 $ 153,360 $ 6,446 $ 195,432 Current period gross charge-offs $ — $ — $ — $ — $ — $ (96) $ — $ — $ (96) Retail & other Grades 1-4 $ 7,281 $ 8,932 $ 6,202 $ 2,925 $ 2,045 $ 4,042 $ 24,107 $ — $ 55,534 Grade 5 — — 18 — — — — — 18 Grade 6 — — — — — — — — — Grade 7 — — 26 10 1 67 — — 104 Total $ 7,281 $ 8,932 $ 6,246 $ 2,935 $ 2,046 $ 4,109 $ 24,107 $ — $ 55,656 Current period gross charge-offs $ (6) $ (1) $ — $ (1) $ — $ (52) $ (165) $ — $ (225) Total loans $ 592,395 $ 1,505,432 $ 1,167,937 $ 608,953 $ 377,141 $ 1,147,253 $ 833,697 $ 6,449 $ 6,239,257 December 31, 2022 Amortized Cost Basis by Origination Year (in thousands) 2022 2021 2020 2019 2018 Prior Revolving Revolving to Term TOTAL Commercial & industrial Grades 1-4 $ 317,394 $ 226,065 $ 101,374 $ 68,884 $ 50,189 $ 77,589 $ 360,978 $ — $ 1,202,473 Grade 5 9,938 5,902 10,811 1,530 3,986 4,562 20,617 — 57,346 Grade 6 1,459 2,283 629 511 402 11,653 14,047 — 30,984 Grade 7 556 293 3,211 2,990 775 1,070 5,121 — 14,016 Total $ 329,347 $ 234,543 $ 116,025 $ 73,915 $ 55,352 $ 94,874 $ 400,763 $ — $ 1,304,819 Current period gross charge-offs $ (38) $ (41) $ (2) $ — $ (109) $ — $ — $ — $ (190) Owner-occupied CRE Grades 1-4 $ 151,391 $ 190,313 $ 105,156 $ 100,606 $ 91,479 $ 252,574 $ 6,734 $ — $ 898,253 Grade 5 5,241 3,192 4,287 2,163 4,791 14,632 348 — 34,654 Grade 6 — — 763 2,361 — 877 — — 4,001 Grade 7 227 706 6,344 616 — 9,798 — — 17,691 Total $ 156,859 $ 194,211 $ 116,550 $ 105,746 $ 96,270 $ 277,881 $ 7,082 $ — $ 954,599 Current period gross charge-offs $ — $ — $ — $ — $ — $ (555) $ — $ — $ (555) Agricultural Grades 1-4 $ 275,208 $ 145,272 $ 85,413 $ 25,463 $ 19,687 $ 130,849 $ 249,033 $ — $ 930,925 Grade 5 13,295 18,178 2,694 1,992 517 43,927 21,199 — 101,802 Grade 6 115 1,457 28 33 — 5,258 429 — 7,320 Grade 7 7,165 2,632 720 1,977 4,611 19,948 11,507 — 48,560 Total $ 295,783 $ 167,539 $ 88,855 $ 29,465 $ 24,815 $ 199,982 $ 282,168 $ — $ 1,088,607 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — CRE investment Grades 1-4 $ 205,930 $ 229,252 $ 192,527 $ 134,301 $ 79,649 $ 248,595 $ 11,383 $ — $ 1,101,637 Grade 5 567 1,649 3,578 4,266 3,086 24,897 — — 38,043 Grade 6 — — — 1,170 2,396 2,483 206 — 6,255 Grade 7 — — 121 299 245 3,140 209 — 4,014 Total $ 206,497 $ 230,901 $ 196,226 $ 140,036 $ 85,376 $ 279,115 $ 11,798 $ — $ 1,149,949 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Construction & land development Grades 1-4 $ 104,804 $ 140,727 $ 12,188 $ 9,747 $ 23,811 $ 13,138 $ 13,235 $ — $ 317,650 Grade 5 37 — — 14 — 95 — — 146 Grade 6 — — — — — — — — — Grade 7 33 — — — — 771 — — 804 Total $ 104,874 $ 140,727 $ 12,188 $ 9,761 $ 23,811 $ 14,004 $ 13,235 $ — $ 318,600 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential construction Grades 1-4 $ 92,417 $ 16,774 $ 966 $ 123 $ 336 $ 229 $ 3,547 $ — $ 114,392 Grade 5 — — — — — — — — — Grade 6 — — — — — — — — — Grade 7 — — — — — — — — — Total $ 92,417 $ 16,774 $ 966 $ 123 $ 336 $ 229 $ 3,547 $ — $ 114,392 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Residential first mortgage Grades 1-4 $ 318,628 $ 272,011 $ 147,857 $ 68,975 $ 31,208 $ 162,153 $ 2,080 $ 3 $ 1,002,915 Grade 5 1,494 758 997 1,803 2,272 465 — — 7,789 Grade 6 — — — 711 — — — — 711 Grade 7 154 329 188 349 197 4,303 — — 5,520 Total $ 320,276 $ 273,098 $ 149,042 $ 71,838 $ 33,677 $ 166,921 $ 2,080 $ 3 $ 1,016,935 Current period gross charge-offs $ — $ — $ — $ — $ — $ (65) $ — $ — $ (65) Residential junior mortgage Grades 1-4 $ 10,119 $ 4,580 $ 5,207 $ 3,151 $ 1,573 $ 3,409 $ 142,784 $ 5,762 $ 176,585 Grade 5 — — — — — 143 165 — 308 Grade 6 — — — — — — — — — Grade 7 — 206 — — — 24 209 — 439 Total $ 10,119 $ 4,786 $ 5,207 $ 3,151 $ 1,573 $ 3,576 $ 143,158 $ 5,762 $ 177,332 Current period gross charge-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Retail & other Grades 1-4 $ 12,318 $ 8,957 $ 4,221 $ 3,188 $ 1,035 $ 24,950 $ 492 $ — $ 55,161 Grade 5 — 23 — — — — — — 23 Grade 6 — — — — — — — — — Grade 7 — 23 22 2 30 5 — — 82 Total $ 12,318 $ 9,003 $ 4,243 $ 3,190 $ 1,065 $ 24,955 $ 492 $ — $ 55,266 Current period gross charge-offs $ — $ (1) $ (6) $ (1) $ — $ — $ (215) $ — $ (223) Total loans $ 1,528,490 $ 1,271,582 $ 689,302 $ 437,225 $ 322,275 $ 1,061,537 $ 864,323 $ 5,765 $ 6,180,499
Schedule of Aggregated by Portfolio Segment and Type of Modification	The following table presents the amortized cost of loans that were both experiencing financial difficulty and were modified during the nine months ended September 30, 2023, aggregated by portfolio segment and type of modification. (in thousands) Payment Delay Term Extension Interest Rate Reduction Term Extension & Interest Rate Reduction Total % of Total Loans Commercial & industrial $ 433 $ — $ 87 $ — $ 520 0.04 % Owner-occupied CRE — — — — — — % Agricultural 107 — — — 107 0.01 % CRE investment — — — — — — % Construction & land development — — — — — — % Residential first mortgage — — — — — — % Total $ 540 $ — $ 87 $ — $ 627 0.01 %

Goodwill and Other Intangible_2

Goodwill and Other Intangibles and Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Intangible Assets	A summary of goodwill and other intangibles was as follows. (in thousands) September 30, 2023 December 31, 2022 Goodwill $ 367,387 $ 367,387 Core deposit intangibles 26,842 32,701 Customer list intangibles 1,979 2,350 Other intangibles 28,821 35,051 Goodwill and other intangibles, net $ 396,208 $ 402,438
Schedule of Goodwill	Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Goodwill: Goodwill at beginning of year $ 367,387 $ 317,189 Acquisitions — 49,970 Purchase accounting adjustment — 228 Goodwill at end of period $ 367,387 $ 367,387
Schedule of Other Intangible Assets	A summary of other intangible assets was as follows. During 2022, core deposit intangibles increased due to the Charter acquisition. Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Core deposit intangibles: Gross carrying amount $ 60,724 $ 60,724 Accumulated amortization (33,882) (28,023) Net book value $ 26,842 $ 32,701 Additions during the period $ — $ 19,364 Amortization during the period $ 5,859 $ 6,108 Customer list intangibles: Gross carrying amount $ 5,523 $ 5,523 Accumulated amortization (3,544) (3,173) Net book value $ 1,979 $ 2,350 Amortization during the period $ 371 $ 508
Schedule of Mortgage and Loan Servicing Rights	A summary of the changes in the mortgage servicing rights asset was as follows. Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Mortgage servicing rights asset: MSR asset at beginning of year $ 13,080 $ 13,636 Capitalized MSR 1,104 2,327 Amortization during the period (2,248) (2,883) MSR asset at end of period $ 11,936 $ 13,080 Valuation allowance at beginning of year $ (500) $ (1,200) Reversals 500 700 Valuation allowance at end of period $ — $ (500) MSR asset, net $ 11,936 $ 12,580 Fair value of MSR asset at end of period $ 15,847 $ 17,215 Residential mortgage loans serviced for others $ 1,610,318 $ 1,637,109 Net book value of MSR asset to loans serviced for others 0.74 % 0.77 % Nine Months Ended Year Ended (in thousands) September 30, 2023 December 31, 2022 Loan servicing rights asset: LSR asset at beginning of year $ 11,039 $ 20,055 Amortization during the period (1,656) (9,016) LSR asset at end of period $ 9,383 $ 11,039 Agricultural loans serviced for others $ 502,901 $ 538,392
Schedule of Estimated Future Amortization Expense for Amortizing Intangible Assets and the MSR Asset	The following table shows the estimated future amortization expense for amortizing intangible assets and the servicing assets. The projections are based on existing asset balances, the current interest rate environment and estimated prepayment speeds as of September 30, 2023. The actual amortization expense the Company recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements and events or circumstances that indicate the carrying amount of an asset may not be recoverable. (in thousands) Core deposit Customer list MSR asset LSR asset Year ending December 31, 2023 (remaining three months) $ 1,730 $ 112 $ 687 $ 552 2024 6,298 449 2,661 1,962 2025 5,161 449 1,978 1,717 2026 3,983 249 1,457 1,472 2027 3,218 166 1,457 1,227 2028 2,622 166 1,456 981 Thereafter 3,830 388 2,240 1,472 Total $ 26,842 $ 1,979 $ 11,936 $ 9,383

Short and Long-Term Borrowings

Short and Long-Term Borrowings (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Components of Long-term Borrowings	The components of long-term borrowings were as follows. (in thousands) September 30, 2023 December 31, 2022 FHLB advances $ 5,000 $ 33,000 Junior subordinated debentures 40,344 39,720 Subordinated notes 152,410 152,622 Total long-term borrowings $ 197,754 $ 225,342
Schedule of Junior Subordinated Debentures and Subordinated Notes	The following table shows the breakdown of junior subordinated debentures and subordinated notes. As of September 30, 2023 As of December 31, 2022 (in thousands) Maturity Interest Par Unamortized Premium /(Discount) / Debt Issue Costs (1) Carrying Interest Carrying Junior Subordinated Debentures: Mid-Wisconsin Statutory Trust I (2) 12/15/2035 7.10 % $ 10,310 $ (2,429) $ 7,881 6.20 % $ 7,734 Baylake Capital Trust II (3) 9/30/2036 7.01 % 16,598 (2,997) 13,601 6.08 % 13,424 First Menasha Statutory Trust (4) 3/17/2034 8.46 % 5,155 (454) 4,701 7.53 % 4,668 County Bancorp Statutory Trust II (5) 9/15/2035 7.20 % 6,186 (792) 5,394 6.30 % 5,277 County Bancorp Statutory Trust III (6) 6/15/2036 7.36 % 6,186 (850) 5,336 6.46 % 5,219 Fox River Valley Capital Trust (7) 5/30/2033 6.40 % 3,610 (179) 3,431 6.40 % 3,398 Total $ 48,045 $ (7,701) $ 40,344 $ 39,720 Subordinated Notes: Subordinated Notes due 2031 7/15/2031 3.13 % $ 100,000 $ (576) $ 99,424 3.13 % $ 99,267 County Subordinated Notes due 2028 6/1/2028 8.56 % 30,000 — 30,000 5.88 % 30,119 County Subordinated Notes due 2030 6/30/2030 7.00 % 22,400 586 22,986 7.00 % 23,236 Total $ 152,400 $ 10 $ 152,410 $ 152,622 (1) Represents the remaining unamortized premium or discount on debt issuances assumed in acquisitions, and represents the unamortized debt issue costs for the debt issued directly by Nicolet. (2) The debentures, assumed in April 2013 as the result of an acquisition, have a floating rate of three-month SOFR plus 1.43%, adjusted quarterly. * (3) The debentures, assumed in April 2016 as a result of an acquisition, have a floating rate of three-month SOFR plus 1.35%, adjusted quarterly. * (4) The debentures, assumed in April 2017 as the result of an acquisition, have a floating rate of three-month SOFR plus 2.79%, adjusted quarterly. * (5) The debentures, assumed in December 2021 as the result of an acquisition, have a floating rate of three-month SOFR plus 1.53%, adjusted quarterly. * (6) The debentures, assumed in December 2021 as the result of an acquisition, have a floating rate of three-month SOFR plus 1.69%, adjusted quarterly. * (7) The debentures, assumed in December 2021 as the result of an acquisition, have a floating rate of 5-year swap rate plus 3.40%, which resets every five years. * The floating rate on this debenture was originally based on three-month LIBOR. Effective with the cessation of LIBOR, the floating rate on this debenture is now based on three-month CME Term SOFR, plus the spread adjustment of 0.26161%.

Commitment and Contingencies (T

Commitment and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of the Contract or Notional Amount of Exposure to Off-balance-sheet Risk	A summary of the contract or notional amount of the Company’s exposure to off-balance sheet risk was as follows. (in thousands) September 30, 2023 December 31, 2022 Commitments to extend credit $ 1,810,068 $ 1,850,601 Financial standby letters of credit 18,235 26,530 Performance standby letters of credit 15,814 9,375

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following table presents the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Recurring Basis: Total Level 1 Level 2 Level 3 September 30, 2023 U.S. Treasury securities $ 37,504 $ — $ 37,504 $ — U.S. government agency securities 8,221 — 8,221 — State, county and municipals 341,330 — 339,949 1,381 Mortgage-backed securities 306,409 — 305,438 971 Corporate debt securities 100,362 — 97,064 3,298 Securities AFS $ 793,826 $ — $ 788,176 $ 5,650 Other investments (equity securities) $ 3,893 $ 3,893 $ — $ — Derivative assets $ 186 $ — $ — $ 186 Derivative liabilities $ — $ — $ — $ — December 31, 2022 U.S. Treasury securities $ 183,830 $ — $ 183,830 $ — U.S. government agency securities 2,100 — 2,100 — State, county and municipals 398,188 — 396,315 1,873 Mortgage-backed securities 200,932 — 199,951 981 Corporate debt securities 132,568 — 127,269 5,299 Securities AFS $ 917,618 $ — $ 909,465 $ 8,153 Other investments (equity securities) $ 4,376 $ 4,376 $ — $ — Derivative assets $ 60 $ — $ — $ 60 Derivative liabilities $ 10 $ — $ — $ 10
Schedule of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The following table presents the changes in Level 3 securities AFS measured at fair value on a recurring basis. (in thousands) Nine Months Ended Year Ended Level 3 Fair Value Measurements: September 30, 2023 December 31, 2022 Balance at beginning of year $ 8,153 $ 8,065 Acquired balance — 750 Maturities / Paydowns (2,469) (451) Unrealized gain / (loss) (34) (211) Balance at end of period $ 5,650 $ 8,153
Schedule of Assets Measured at Fair Value on a Nonrecurring Basis	The following table presents the Company’s assets measured at fair value on a nonrecurring basis, aggregated by level in the fair value hierarchy within which those measurements fall. (in thousands) Fair Value Measurements Using Measured at Fair Value on a Nonrecurring Basis: Total Level 1 Level 2 Level 3 September 30, 2023 Collateral dependent loans $ 22,925 $ — $ — $ 22,925 Other real estate owned (“OREO”) 2,031 — — 2,031 MSR asset 11,936 — — 11,936 December 31, 2022 Collateral dependent loans $ 30,951 $ — $ — $ 30,951 OREO 1,975 — — 1,975 MSR asset 12,580 — — 12,580
Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments	The carrying amounts and estimated fair values of the Company’s financial instruments are shown below. September 30, 2023 (in thousands) Carrying Estimated Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 545,880 $ 545,880 $ 545,880 $ — $ — Certificates of deposit in other banks 7,598 7,519 — 7,519 — Securities AFS 793,826 793,826 — 788,176 5,650 Other investments, including equity securities 58,367 58,367 3,893 43,973 10,501 Loans held for sale 6,500 6,641 — 6,641 — Loans, net 6,176,097 5,908,160 — — 5,908,160 MSR asset 11,936 15,847 — — 15,847 LSR asset 9,383 9,383 — — 9,383 Accrued interest receivable 24,166 24,166 24,166 — — Financial liabilities: Deposits $ 7,182,388 $ 7,164,174 $ — $ — $ 7,164,174 Short-term borrowings — — — — — Long-term borrowings 197,754 190,738 — 4,736 186,002 Accrued interest payable 7,028 7,028 7,028 — — December 31, 2022 (in thousands) Carrying Estimated Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 154,723 $ 154,723 $ 154,723 $ — $ — Certificates of deposit in other banks 12,518 12,407 — 12,407 — Securities AFS 917,618 917,618 — 909,465 8,153 Securities HTM 679,128 623,352 — 623,352 — Other investments, including equity securities 65,286 65,286 4,376 52,093 8,817 Loans held for sale 1,482 1,529 — 1,529 — Loans, net 6,118,670 5,863,570 — — 5,863,570 MSR asset 12,580 17,215 — — 17,215 LSR asset 11,039 11,039 — — 11,039 Accrued interest receivable 21,275 21,275 21,275 — — Financial liabilities: Deposits $ 7,178,921 $ 7,172,779 $ — $ — $ 7,172,779 Short-term borrowings 317,000 317,000 317,000 — — Long-term borrowings 225,342 220,513 — 33,001 187,512 Accrued interest payable 4,265 4,265 4,265 — —

Acquisition - Narrative (Detail

Acquisition - Narrative (Details) - Charter Bankshares, Inc. $ / shares in Units, $ in Millions	Aug. 26, 2022 USD ($) $ / shares shares
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares) | shares	15.458
Cash paid per acquiree share (in dollars per share) | $ / shares	$ 475
Number of common stock issued for consideration (in shares) | shares	1,262,360
Value of Nicolet common stock consideration	$ 98
Cash consideration paid	39
Purchase price	$ 137

Acquisition - Schedule of the A

Acquisition - Schedule of the Assets Acquired and Liabilities Assumed, Including Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended	13 Months Ended
	Aug. 26, 2022	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2023
Purchase Price:
Goodwill		$ 0	$ 49,970
Charter Bankshares, Inc.
Assets Acquired:
Cash and cash equivalents	$ 10,000	10,000		$ 10,000
Investment securities	218,000	218,000		218,000
Loans	848,000	827,000		827,000
ACL-Loans	(9,000)	(2,000)		(2,000)
Premises and equipment	9,000	10,000		10,000
BOLI	29,000	29,000		29,000
Core deposit intangible	0	19,000		19,000
Other assets	5,000	10,000		10,000
Total assets	1,110,000	1,121,000		1,121,000
Liabilities Assumed:
Deposits	869,000	870,000		870,000
Borrowings	161,000	161,000		161,000
Other liabilities	3,000	3,000		3,000
Total liabilities	$ 1,033,000	1,034,000		1,034,000
Net assets acquired		$ 87,000		87,000
Assets Acquired:
Cash and cash equivalents				0
Investment securities				0
Loans				(21,000)
ACL-Loans				7,000
Premises and equipment				1,000
BOLI				0
Core deposit intangible				19,000
Other assets				5,000
Total assets				11,000
Liabilities Assumed:
Deposits				1,000
Borrowings				0
Other liabilities				0
Total liabilities				$ 1,000
Purchase Price:
Nicolet common stock issued (in shares)	1,262,360
Value of Nicolet common stock consideration	$ 98,000
Cash consideration paid	39,000
Total purchase price	137,000
Goodwill	$ 50,000

Acquisition - Schedule of Carry

Acquisition - Schedule of Carrying Amount of these Loans at Acquisition (Details) - Charter Bankshares, Inc. - USD ($) $ in Thousands	Sep. 30, 2023	Aug. 26, 2022
Business Acquisition [Line Items]
Allowance for credit losses on PCD loans at acquisition	$ 2,000	$ 9,000
Par value of PCD acquired loans at acquisition	$ 827,000	848,000
PCD loans aquired
Business Acquisition [Line Items]
Purchase price of PCD loans at acquisition		24,031
Allowance for credit losses on PCD loans at acquisition		1,709
Par value of PCD acquired loans at acquisition		$ 25,740

Earnings per Common Share - Sch

Earnings per Common Share - Schedule of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 17,158	$ 18,510	$ 30,855	$ 66,659
Weighted average common shares outstanding (in shares)	14,740,319	13,890,066	14,715,588	13,647,973
Effect of dilutive common stock awards (in shares)	360,000	420,000	328,000	479,000
Diluted weighted average common shares outstanding (in shares)	15,099,622	14,310,275	15,044,259	14,126,772
Basic earnings per common share (in dollars per share)	$ 1.16	$ 1.33	$ 2.10	$ 4.88
Diluted earnings per common share (in dollars per share)	$ 1.14	$ 1.29	$ 2.05	$ 4.72

Earnings per Common Share - Nar

Earnings per Common Share - Narrative (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Shares excluded from calculation of earnings per common share (in shares)	0.1	0.2	0.2	0.1

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares were available for grant (in shares)	700,000
Stock-based compensation expense	$ 4.2	$ 4.6
Unrecognized compensation cost	$ 14
Remaining vesting period over which cost expected to be recognized	3 years
Tax benefit for impact of share based compensation	$ 0.5	0.4
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 3.7	3.3
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock grant (in shares)	11,674
Restricted Stock | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0.6	$ 0.7
Restricted stock grant (in shares)	11,674	8,852

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Weighted Average Assumption for Stock Option (Details) - Stock Incentive Plan - Stock Options - $ / shares	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.60%	0%
Expected volatility	30%	30%
Risk-free interest rate	3.74%	3.03%
Expected average life (in years)	7 years	7 years
Weighted average per share fair value of options (in dollars per share)	$ 20.94	$ 30.99

Stock-Based Compensation - Sc_2

Stock-Based Compensation - Schedule of Stock Options Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Weighted Average Exercise Price
Shares surrendered to satisfy exercise price and/or tax withholding requirements (in shares)	54,517
Stock Incentive Plan | Stock Options
Option Shares Outstanding
Beginning balance outstanding (in shares)	1,853,064
Granted (in shares)	7,000
Exercise of stock options (in shares)	(115,179)
Forfeited (in shares)	(25,000)
Ending balance outstanding (in shares)	1,719,885
Exercisable (in shares)	1,260,942
Weighted Average Exercise Price
Beginning balance outstanding (in dollars per share) | $ / shares	$ 59.79
Granted (in dollars per share) | $ / shares	64.36
Exercise of stock options (in dollars per share) | $ / shares	40.02
Forfeited (in dollars per share) | $ / shares	84.98
Ending balance outstanding (in dollars per share) | $ / shares	60.76
Exercisable (in dollars per share) | $ / shares	$ 55.09
Weighted average remaining life outstanding	5 years 3 months 18 days
Weighted average remaining life exercisable	4 years 6 months
Aggregate intrinsic value outstanding | $	$ 20,354
Aggregate intrinsic value exercisable | $	$ 20,217

Stock-Based Compensation - Sc_3

Stock-Based Compensation - Schedule of Restricted Stock Activity (Details) - Restricted Stock	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Weighted Average Grant Date Fair Value
Beginning balance outstanding (in dollars per share) | $ / shares	$ 76.49
Granted (in dollars per share) | $ / shares	55.65
Vested (in dollars per share) | $ / shares	66.40
Ending balance outstanding (in dollars per share) | $ / shares	$ 76.57
Restricted Shares Outstanding
Beginning balance outstanding (in shares) | shares	73,490
Granted (in shares) | shares	11,674
Vested (in shares) | shares	(24,574)
Ending balance outstanding (in shares) | shares	60,590

Securities and Other Investme_3

Securities and Other Investments - Schedule of Amortized Costs and Fair Value of Securities AFS and HTM (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 904,893	$ 996,344
Gross Unrealized Gains	71	136
Gross Unrealized Losses	111,138	78,862
Estimated Fair Value	793,826	917,618
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0	679,128
Gross Unrealized Gains		46
Gross Unrealized Losses		55,822
Estimated Fair Value		623,352
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	42,190	192,116
Gross Unrealized Gains	0	0
Gross Unrealized Losses	4,686	8,286
Estimated Fair Value	37,504	183,830
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		497,648
Gross Unrealized Gains		0
Gross Unrealized Losses		35,722
Estimated Fair Value		461,926
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,293	2,133
Gross Unrealized Gains	2	0
Gross Unrealized Losses	74	33
Estimated Fair Value	8,221	2,100
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		8,744
Gross Unrealized Gains		46
Gross Unrealized Losses		0
Estimated Fair Value		8,790
State, county and municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	387,259	433,733
Gross Unrealized Gains	69	123
Gross Unrealized Losses	45,998	35,668
Estimated Fair Value	341,330	398,188
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		34,874
Gross Unrealized Gains		0
Gross Unrealized Losses		3,349
Estimated Fair Value		31,525
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	355,906	227,650
Gross Unrealized Gains	0	10
Gross Unrealized Losses	49,497	26,728
Estimated Fair Value	306,409	200,932
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		137,862
Gross Unrealized Gains		0
Gross Unrealized Losses		16,751
Estimated Fair Value		121,111
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	111,245	140,712
Gross Unrealized Gains	0	3
Gross Unrealized Losses	10,883	8,147
Estimated Fair Value	$ 100,362	$ 132,568

Securities and Other Investme_4

Securities and Other Investments - Narrative (Details) - USD ($)		3 Months Ended			9 Months Ended
	Mar. 07, 2023	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Pre-tax loss					$ 37,723,000	$ 0
Other comprehensive loss		$ 18,082,000		$ 19,098,000	25,881,000	$ 65,441,000
Investments securities pledged as collateral		345,000,000			345,000,000		$ 883,000,000
Accrued interest on investment securities		5,000,000			5,000,000		5,000,000
Provision for credit loss			$ 2,300,000
Charge-off of credit loss			$ 2,300,000
Allowance for credit losses on securities AFS		$ 0			$ 0		0
U.S. Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Sale of held-to-maturity debt securities at par value	$ 500,000,000
Pre-tax loss	38,000,000
After-tax loss	28,000,000
Held to maturity securities book value	177,000,000
Carrying value	157,000,000
U.S. Treasury securities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Schedule of Held-to-maturity Securities [Line Items]
Unrealized loss	20,000,000
Other comprehensive loss	$ 15,000,000
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Allowance for credit losses on securities HTM							$ 0

Securities and Other Investme_5

Securities and Other Investments - Schedule of Proceeds and Realized Gains or Losses from the Sale of AFS and HTM Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Securities AFS:
Gross gains	$ 268	$ 20
Gross losses	(605)	(5)
Gains (losses) on sales of securities AFS, net	(337)	15
Proceeds from sales of securities AFS	28,992	23,984
Securities HTM:
Gross gains	0	0
Gross losses	(37,723)	0
Gains (losses) on sales of securities HTM, net	(37,723)	0
Proceeds from sales of securities HTM	$ 460,051	$ 0

Securities and Other Investme_6

Securities and Other Investments - Schedule of Unrealized Losses and Fair Value of Investment Securities (Details) $ in Thousands	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 95,106	$ 497,072
Less than 12 months, unrealized losses	5,983	35,593
12 months or more, fair value	682,099	378,520
12 months or more, unrealized losses	105,155	43,269
Total, fair value	777,205	875,592
Total, unrealized losses	$ 111,138	$ 78,862
Total, number of securities | security	1,242	1,296
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value		$ 85,699
Less than 12 months, unrealized losses		9,623
12 months or more, fair value		526,583
12 months or more, unrealized losses		46,199
Total, fair value		612,282
Total, unrealized losses		$ 55,822
Total, number of securities | security		170
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 0	$ 448
Less than 12 months, unrealized losses	0	14
12 months or more, fair value	37,504	183,382
12 months or more, unrealized losses	4,686	8,272
Total, fair value	37,504	183,830
Total, unrealized losses	$ 4,686	$ 8,286
Total, number of securities | security	4	9
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value		$ 0
Less than 12 months, unrealized losses		0
12 months or more, fair value		461,926
12 months or more, unrealized losses		35,722
Total, fair value		461,926
Total, unrealized losses		$ 35,722
Total, number of securities | security		6
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 5,396	$ 2,083
Less than 12 months, unrealized losses	32	32
12 months or more, fair value	1,798	17
12 months or more, unrealized losses	42	1
Total, fair value	7,194	2,100
Total, unrealized losses	$ 74	$ 33
Total, number of securities | security	10	9
State, county and municipals
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 66,415	$ 277,546
Less than 12 months, unrealized losses	5,460	18,041
12 months or more, fair value	263,740	86,569
12 months or more, unrealized losses	40,538	17,627
Total, fair value	330,155	364,115
Total, unrealized losses	$ 45,998	$ 35,668
Total, number of securities | security	710	812
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value		$ 17,591
Less than 12 months, unrealized losses		1,594
12 months or more, fair value		11,654
12 months or more, unrealized losses		1,755
Total, fair value		29,245
Total, unrealized losses		$ 3,349
Total, number of securities | security		58
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 19,959	$ 102,108
Less than 12 months, unrealized losses	268	11,320
12 months or more, fair value	286,450	95,614
12 months or more, unrealized losses	49,229	15,408
Total, fair value	306,409	197,722
Total, unrealized losses	$ 49,497	$ 26,728
Total, number of securities | security	451	376
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value		$ 68,108
Less than 12 months, unrealized losses		8,029
12 months or more, fair value		53,003
12 months or more, unrealized losses		8,722
Total, fair value		121,111
Total, unrealized losses		$ 16,751
Total, number of securities | security		106
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 3,336	$ 114,887
Less than 12 months, unrealized losses	223	6,186
12 months or more, fair value	92,607	12,938
12 months or more, unrealized losses	10,660	1,961
Total, fair value	95,943	127,825
Total, unrealized losses	$ 10,883	$ 8,147
Total, number of securities | security	67	90

Securities and Other Investme_7

Securities and Other Investments - Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in less than one year	$ 65,155
Due in one year through five years	162,719
Due after five years through ten years	207,337
Due after ten years	113,776
Allocated and single maturity date	548,987
Amortized Cost	904,893	$ 996,344
Fair Value
Due in less than one year	64,470
Due in one year through five years	147,803
Due after five years through ten years	177,658
Due after ten years	97,486
Allocated and single maturity date	487,417
Fair Value	793,826	917,618
Mortgage-backed securities
Amortized Cost
Mortgage-backed securities	355,906
Amortized Cost	355,906	227,650
Fair Value
Mortgage-backed securities	306,409
Fair Value	$ 306,409	$ 200,932

Securities and Other Investme_8

Securities and Other Investments - Schedule of Carrying Value of other Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Federal Reserve Bank stock	$ 33,050	$ 32,219
Federal Home Loan Bank (“FHLB”) stock	9,674	18,625
Equity securities with readily determinable fair values	3,893	4,376
Other investments	11,750	10,066
Total other investments	$ 58,367	$ 65,286

Loans, Allowance for Credit L_3

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Loan Composition (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,239,257		$ 6,180,499
Less allowance for credit losses - Loans (“ACL-Loans”)	63,160	$ 62,811	61,829	$ 60,348	$ 50,655	$ 49,672
Loans, net	$ 6,176,097		$ 6,118,670
Allowance for credit losses - Loans to loans (in percent)	1.01%		1%
% of Total	100%		100%
Retail & other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 55,656		$ 55,266
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 1,175		$ 1,029			932
% of Total	1%		1%
Commercial | Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,237,789		$ 1,304,819
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 14,947		$ 16,350			12,613
% of Total	20%		21%
Commercial | Owner-occupied commercial real estate (“CRE”)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 971,397		$ 954,599
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 9,126		$ 9,138			7,222
% of Total	16%		15%
Commercial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,108,261		$ 1,088,607
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 12,166		$ 9,762			9,547
% of Total	18%		18%
Commercial real estate | CRE investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,130,938		$ 1,149,949
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 12,790		$ 12,744			8,462
% of Total	18%		19%
Commercial real estate | Construction & land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 326,747		$ 318,600
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 2,668		$ 2,572			1,812
% of Total	5%		5%
Residential | Residential first mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,136,748		$ 1,016,935
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 7,315		$ 6,976			6,844
% of Total	18%		16%
Residential | Residential junior mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 195,432		$ 177,332
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 2,045		$ 1,846			1,340
% of Total	3%		3%
Residential | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 76,289		$ 114,392
Less allowance for credit losses - Loans (“ACL-Loans”)	$ 928		$ 1,412			$ 900
% of Total	1%		2%

Loans, Allowance for Credit L_4

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Narrative (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest on loans	$ 19,000,000	$ 15,000,000
Material loans criteria for ACL-Loans adequacy calculation	250,000
Reserve for unfunded commitments	$ 3,000,000	3,000,000
Troubled debt restructurings		18,000,000
Pre-modification balance		$ 24,000,000

Loans, Allowance for Credit L_5

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 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]
Beginning balance	$ 62,811	$ 50,655	$ 61,829	$ 49,672	$ 49,672
ACL on PCD loans acquired	0	1,709	0	1,709	1,937
Provision for credit losses	450	8,200	1,650	9,100	10,950
Charge-offs	(346)	(300)	(1,091)	(442)	(1,033)
Recoveries	245	84	772		303
Net (charge-offs) recoveries	(101)	(216)	(319)	(133)	(730)
Ending balance	$ 63,160	$ 60,348	$ 63,160	60,348	$ 61,829
Previously Reported
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Recoveries				$ 309

Loans, Allowance for Credit L_6

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Activity in ACL - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
ACL-Loans
Beginning balance	$ 62,811	$ 50,655	$ 61,829	$ 49,672	$ 49,672
ACL on PCD loans acquired	0	1,709	0	1,709	1,937
Provision for credit losses	450	8,200	1,650	9,100	10,950
Charge-offs	(346)	(300)	(1,091)	(442)	(1,033)
Recoveries	245	84	772		303
Net (charge-offs) recoveries	(101)	(216)	(319)	(133)	(730)
Ending balance	63,160	$ 60,348	$ 63,160	60,348	$ 61,829
As % of ACL-Loans			100%		100%
Retail & other
ACL-Loans
Beginning balance			$ 1,029	932	$ 932
ACL on PCD loans acquired					0
Provision for credit losses			364		299
Charge-offs			(225)		(223)
Recoveries			7		21
Net (charge-offs) recoveries			(218)		(202)
Ending balance	1,175		$ 1,175		$ 1,029
As % of ACL-Loans			2%		2%
Commercial | Commercial & industrial
ACL-Loans
Beginning balance			$ 16,350	12,613	$ 12,613
ACL on PCD loans acquired					1,408
Provision for credit losses			(1,518)		2,415
Charge-offs			(403)		(190)
Recoveries			518		104
Net (charge-offs) recoveries			115		(86)
Ending balance	14,947		$ 14,947		$ 16,350
As % of ACL-Loans			24%		26%
Commercial | Owner-occupied CRE
ACL-Loans
Beginning balance			$ 9,138	7,222	$ 7,222
ACL on PCD loans acquired					384
Provision for credit losses			48		2,087
Charge-offs			(301)		(555)
Recoveries			241		0
Net (charge-offs) recoveries			(60)		(555)
Ending balance	9,126		$ 9,126		$ 9,138
As % of ACL-Loans			14%		15%
Commercial | Agricultural
ACL-Loans
Beginning balance			$ 9,762	9,547	$ 9,547
ACL on PCD loans acquired					0
Provision for credit losses			2,467		215
Charge-offs			(66)		0
Recoveries			3		0
Net (charge-offs) recoveries			(63)		0
Ending balance	12,166		$ 12,166		$ 9,762
As % of ACL-Loans			19%		16%
Commercial real estate | CRE investment
ACL-Loans
Beginning balance			$ 12,744	8,462	$ 8,462
ACL on PCD loans acquired					38
Provision for credit losses			46		4,075
Charge-offs			0		0
Recoveries			0		169
Net (charge-offs) recoveries			0		169
Ending balance	12,790		$ 12,790		$ 12,744
As % of ACL-Loans			20%		21%
Commercial real estate | Construction & land development
ACL-Loans
Beginning balance			$ 2,572	1,812	$ 1,812
ACL on PCD loans acquired					2
Provision for credit losses			96		758
Charge-offs			0		0
Recoveries			0		0
Net (charge-offs) recoveries			0		0
Ending balance	2,668		$ 2,668		$ 2,572
As % of ACL-Loans			4%		4%
Residential | Residential first mortgage
ACL-Loans
Beginning balance			$ 6,976	6,844	$ 6,844
ACL on PCD loans acquired					93
Provision for credit losses			336		96
Charge-offs			0		(65)
Recoveries			3		8
Net (charge-offs) recoveries			3		(57)
Ending balance	7,315		$ 7,315		$ 6,976
As % of ACL-Loans			12%		11%
Residential | Residential junior mortgage
ACL-Loans
Beginning balance			$ 1,846	1,340	$ 1,340
ACL on PCD loans acquired					12
Provision for credit losses			295		493
Charge-offs			(96)		0
Recoveries			0		1
Net (charge-offs) recoveries			(96)		1
Ending balance	2,045		$ 2,045		$ 1,846
As % of ACL-Loans			3%		3%
Residential | Residential construction
ACL-Loans
Beginning balance			$ 1,412	$ 900	$ 900
ACL on PCD loans acquired					0
Provision for credit losses			(484)		512
Charge-offs			0		0
Recoveries			0		0
Net (charge-offs) recoveries			0		0
Ending balance	$ 928		$ 928		$ 1,412
As % of ACL-Loans			2%		2%

Loans, Allowance for Credit L_7

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Provision for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Receivables [Abstract]
Loans	$ 450	$ 8,200	$ 1,650	$ 9,100	$ 10,950
Unfunded commitments	0	400	0	550	550
Investment securities	0	0	2,340	0	0
Total	$ 450	$ 8,600	$ 3,990	$ 9,650	$ 11,500

Loans, Allowance for Credit L_8

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Collateral Dependent Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 23,297	$ 32,072
Without an Allowance	16,946	22,724
With an Allowance	6,351	9,348
Allowance Allocation	372	1,121
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	14,084	22,139
Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	9,213	9,933
Commercial | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	3,402	3,475
Without an Allowance	2,351	1,927
With an Allowance	1,051	1,548
Allowance Allocation	230	595
Commercial | Commercial & industrial | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0	0
Commercial | Commercial & industrial | Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	3,402	3,475
Commercial | Owner-occupied CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	4,827	4,907
Without an Allowance	4,827	4,699
With an Allowance	0	208
Allowance Allocation	0	53
Commercial | Owner-occupied CRE | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	4,827	4,907
Commercial | Owner-occupied CRE | Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0	0
Commercial | Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	13,440	20,216
Without an Allowance	8,530	14,358
With an Allowance	4,910	5,858
Allowance Allocation	123	261
Commercial | Agricultural | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	7,629	13,758
Commercial | Agricultural | Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	5,811	6,458
Commercial real estate | CRE investment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	942	2,713
Without an Allowance	552	979
With an Allowance	390	1,734
Allowance Allocation	19	212
Commercial real estate | CRE investment | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	942	2,713
Commercial real estate | CRE investment | Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0	0
Commercial real estate | Construction & land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0	670
Without an Allowance	0	670
With an Allowance	0	0
Allowance Allocation	0	0
Commercial real estate | Construction & land development | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0	670
Commercial real estate | Construction & land development | Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0	0
Residential | Residential first mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	686	91
Without an Allowance	686	91
With an Allowance	0	0
Allowance Allocation	0	0
Residential | Residential first mortgage | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	686	91
Residential | Residential first mortgage | Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0	$ 0
Residential | Residential junior mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Without an Allowance	0
With an Allowance	0
Allowance Allocation	0
Residential | Residential junior mortgage | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Residential | Residential junior mortgage | Other Business Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 0

Loans, Allowance for Credit L_9

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Past Due Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans	$ 6,239,257	$ 6,180,499
Percent of total loans	100%	100%
30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	$ 3,277	$ 5,188
Percent past due	0.10%	0.10%
90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	$ 29,507	$ 38,080
Percent past due	0.50%	0.60%
Current
Financing Receivable, Past Due [Line Items]
Loans	$ 6,206,473	$ 6,137,231
Percent of current loans	99.40%	99.30%
Retail & other
Financing Receivable, Past Due [Line Items]
Loans	$ 55,656	$ 55,266
Retail & other | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	729	261
Retail & other | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	74	82
Retail & other | Current
Financing Receivable, Past Due [Line Items]
Loans	54,853	54,923
Commercial | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Loans	1,237,789	1,304,819
Commercial | Commercial & industrial | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	281	210
Commercial | Commercial & industrial | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	5,192	3,328
Commercial | Commercial & industrial | Current
Financing Receivable, Past Due [Line Items]
Loans	1,232,316	1,301,281
Commercial | Owner-occupied CRE
Financing Receivable, Past Due [Line Items]
Loans	971,397	954,599
Commercial | Owner-occupied CRE | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	76	833
Commercial | Owner-occupied CRE | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	5,602	5,647
Commercial | Owner-occupied CRE | Current
Financing Receivable, Past Due [Line Items]
Loans	965,719	948,119
Commercial | Agricultural
Financing Receivable, Past Due [Line Items]
Loans	1,108,261	1,088,607
Commercial | Agricultural | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	151	20
Commercial | Agricultural | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	13,458	20,416
Commercial | Agricultural | Current
Financing Receivable, Past Due [Line Items]
Loans	1,094,652	1,068,171
Commercial real estate | CRE investment
Financing Receivable, Past Due [Line Items]
Loans	1,130,938	1,149,949
Commercial real estate | CRE investment | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	240	0
Commercial real estate | CRE investment | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	1,100	3,832
Commercial real estate | CRE investment | Current
Financing Receivable, Past Due [Line Items]
Loans	1,129,598	1,146,117
Commercial real estate | Construction & land development
Financing Receivable, Past Due [Line Items]
Loans	326,747	318,600
Commercial real estate | Construction & land development | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	23	0
Commercial real estate | Construction & land development | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	177	771
Commercial real estate | Construction & land development | Current
Financing Receivable, Past Due [Line Items]
Loans	326,547	317,829
Residential | Residential first mortgage
Financing Receivable, Past Due [Line Items]
Loans	1,136,748	1,016,935
Residential | Residential first mortgage | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	1,710	3,628
Residential | Residential first mortgage | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	3,812	3,780
Residential | Residential first mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans	1,131,226	1,009,527
Residential | Residential junior mortgage
Financing Receivable, Past Due [Line Items]
Loans	195,432	177,332
Residential | Residential junior mortgage | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	67	236
Residential | Residential junior mortgage | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	92	224
Residential | Residential junior mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans	195,273	176,872
Residential | Residential construction
Financing Receivable, Past Due [Line Items]
Loans	76,289	114,392
Residential | Residential construction | 30-89 Days Past Due (accruing)
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential | Residential construction | 90 Days & Over or nonaccrual
Financing Receivable, Past Due [Line Items]
Loans	0	0
Residential | Residential construction | Current
Financing Receivable, Past Due [Line Items]
Loans	$ 76,289	$ 114,392

Loans, Allowance for Credit _10

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Nonaccrual Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 29,507	$ 38,080
Percent of total loans	0.50%	0.60%
% of Total	100%	100%
Retail & other
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 74	$ 82
% of Total	0%	0%
Commercial | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 5,192	$ 3,328
% of Total	17%	9%
Commercial | Owner-occupied CRE
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 5,602	$ 5,647
% of Total	19%	15%
Commercial | Agricultural
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 13,458	$ 20,416
% of Total	46%	53%
Commercial real estate | CRE investment
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 1,100	$ 3,832
% of Total	4%	10%
Commercial real estate | Construction & land development
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 177	$ 771
% of Total	1%	2%
Residential | Residential first mortgage
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 3,812	$ 3,780
% of Total	13%	10%
Residential | Residential junior mortgage
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 92	$ 224
% of Total	0%	1%
Residential | Residential construction
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 0	$ 0
% of Total	0%	0%

Loans, Allowance for Credit _11

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Loans by Risk Categories and Gross Charge-offs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	$ 592,395	$ 1,528,490
2022/2021	1,505,432	1,271,582
2021/2020	1,167,937	689,302
2020/2019	608,953	437,225
2019/2018	377,141	322,275
Prior	1,147,253	1,061,537
Revolving	833,697	864,323
Revolving to Term	6,449	5,765
Total loans	6,239,257	6,180,499
Residential first mortgage
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	(65)
Revolving	0	0
Revolving to Term	0	0
Total loans	0	(65)
Residential junior mortgage
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	(96)	0
Revolving	0	0
Revolving to Term	0	0
Total loans	(96)	0
Retail & other
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022		0
2022/2021		(1)
2021/2020		(6)
2020/2019		(1)
2019/2018		0
Prior		0
Revolving		(215)
Revolving to Term		0
Total loans		(223)
Commercial & industrial
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	(38)
2022/2021	(77)	(41)
2021/2020	(114)	(2)
2020/2019	0	0
2019/2018	0	(109)
Prior	(197)	0
Revolving	(15)	0
Revolving to Term	0	0
Total loans	(403)	(190)
Owner-occupied CRE
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	(301)	(555)
Revolving	0	0
Revolving to Term	0	0
Total loans	(301)	(555)
Agricultural
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	(66)	0
Revolving	0	0
Revolving to Term	0	0
Total loans	(66)	0
CRE investment
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Construction & land development
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Residential construction
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Retail & other
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	7,281	12,318
2022/2021	8,932	9,003
2021/2020	6,246	4,243
2020/2019	2,935	3,190
2019/2018	2,046	1,065
Prior	4,109	24,955
Revolving	24,107	492
Revolving to Term	0	0
Total loans	55,656	55,266
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	(6)
2022/2021	(1)
2021/2020	0
2020/2019	(1)
2019/2018	0
Prior	(52)
Revolving	(165)
Revolving to Term	0
Total loans	(225)
Retail & other | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	7,281	12,318
2022/2021	8,932	8,957
2021/2020	6,202	4,221
2020/2019	2,925	3,188
2019/2018	2,045	1,035
Prior	4,042	24,950
Revolving	24,107	492
Revolving to Term	0	0
Total loans	55,534	55,161
Retail & other | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	23
2021/2020	18	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	18	23
Retail & other | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Retail & other | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	23
2021/2020	26	22
2020/2019	10	2
2019/2018	1	30
Prior	67	5
Revolving	0	0
Revolving to Term	0	0
Total loans	104	82
Commercial | Commercial & industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	162,179	329,347
2022/2021	269,933	234,543
2021/2020	194,822	116,025
2020/2019	78,962	73,915
2019/2018	56,553	55,352
Prior	111,866	94,874
Revolving	363,474	400,763
Revolving to Term	0	0
Total loans	1,237,789	1,304,819
Commercial | Commercial & industrial | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	152,385	317,394
2022/2021	254,446	226,065
2021/2020	184,778	101,374
2020/2019	73,488	68,884
2019/2018	53,351	50,189
Prior	96,269	77,589
Revolving	334,059	360,978
Revolving to Term	0	0
Total loans	1,148,776	1,202,473
Commercial | Commercial & industrial | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	5,350	9,938
2022/2021	10,296	5,902
2021/2020	6,779	10,811
2020/2019	2,908	1,530
2019/2018	1,246	3,986
Prior	7,364	4,562
Revolving	24,477	20,617
Revolving to Term	0	0
Total loans	58,420	57,346
Commercial | Commercial & industrial | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	1,459
2022/2021	591	2,283
2021/2020	612	629
2020/2019	194	511
2019/2018	4	402
Prior	1,028	11,653
Revolving	1,850	14,047
Revolving to Term	0	0
Total loans	4,279	30,984
Commercial | Commercial & industrial | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	4,444	556
2022/2021	4,600	293
2021/2020	2,653	3,211
2020/2019	2,372	2,990
2019/2018	1,952	775
Prior	7,205	1,070
Revolving	3,088	5,121
Revolving to Term	0	0
Total loans	26,314	14,016
Commercial | Owner-occupied CRE
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	102,636	156,859
2022/2021	161,433	194,211
2021/2020	197,971	116,550
2020/2019	111,880	105,746
2019/2018	92,663	96,270
Prior	301,193	277,881
Revolving	3,621	7,082
Revolving to Term	0	0
Total loans	971,397	954,599
Commercial | Owner-occupied CRE | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	101,687	151,391
2022/2021	157,461	190,313
2021/2020	186,745	105,156
2020/2019	98,057	100,606
2019/2018	90,223	91,479
Prior	277,024	252,574
Revolving	3,114	6,734
Revolving to Term	0	0
Total loans	914,311	898,253
Commercial | Owner-occupied CRE | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	949	5,241
2022/2021	3,754	3,192
2021/2020	9,854	4,287
2020/2019	5,362	2,163
2019/2018	1,481	4,791
Prior	15,158	14,632
Revolving	212	348
Revolving to Term	0	0
Total loans	36,770	34,654
Commercial | Owner-occupied CRE | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	348	763
2020/2019	1,545	2,361
2019/2018	605	0
Prior	150	877
Revolving	0	0
Revolving to Term	0	0
Total loans	2,648	4,001
Commercial | Owner-occupied CRE | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	227
2022/2021	218	706
2021/2020	1,024	6,344
2020/2019	6,916	616
2019/2018	354	0
Prior	8,861	9,798
Revolving	295	0
Revolving to Term	0	0
Total loans	17,668	17,691
Commercial | Agricultural
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	79,437	295,783
2022/2021	300,487	167,539
2021/2020	150,368	88,855
2020/2019	82,177	29,465
2019/2018	25,994	24,815
Prior	195,031	199,982
Revolving	274,767	282,168
Revolving to Term	0	0
Total loans	1,108,261	1,088,607
Commercial | Agricultural | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	72,777	275,208
2022/2021	282,254	145,272
2021/2020	136,796	85,413
2020/2019	80,960	25,463
2019/2018	23,694	19,687
Prior	144,223	130,849
Revolving	252,202	249,033
Revolving to Term	0	0
Total loans	992,906	930,925
Commercial | Agricultural | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	2,809	13,295
2022/2021	11,201	18,178
2021/2020	6,003	2,694
2020/2019	725	1,992
2019/2018	384	517
Prior	33,751	43,927
Revolving	14,316	21,199
Revolving to Term	0	0
Total loans	69,189	101,802
Commercial | Agricultural | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	115
2022/2021	134	1,457
2021/2020	1,114	28
2020/2019	0	33
2019/2018	51	0
Prior	2,293	5,258
Revolving	207	429
Revolving to Term	0	0
Total loans	3,799	7,320
Commercial | Agricultural | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	3,851	7,165
2022/2021	6,898	2,632
2021/2020	6,455	720
2020/2019	492	1,977
2019/2018	1,865	4,611
Prior	14,764	19,948
Revolving	8,042	11,507
Revolving to Term	0	0
Total loans	42,367	48,560
Commercial real estate | CRE investment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	29,925	206,497
2022/2021	191,713	230,901
2021/2020	262,441	196,226
2020/2019	180,871	140,036
2019/2018	128,223	85,376
Prior	326,206	279,115
Revolving	11,559	11,798
Revolving to Term	0	0
Total loans	1,130,938	1,149,949
Commercial real estate | CRE investment | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	27,123	205,930
2022/2021	183,799	229,252
2021/2020	247,563	192,527
2020/2019	172,237	134,301
2019/2018	117,114	79,649
Prior	294,916	248,595
Revolving	11,445	11,383
Revolving to Term	0	0
Total loans	1,054,197	1,101,637
Commercial real estate | CRE investment | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	2,802	567
2022/2021	7,859	1,649
2021/2020	14,857	3,578
2020/2019	8,634	4,266
2019/2018	10,066	3,086
Prior	21,927	24,897
Revolving	49	0
Revolving to Term	0	0
Total loans	66,194	38,043
Commercial real estate | CRE investment | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	1,170
2019/2018	0	2,396
Prior	1,357	2,483
Revolving	65	206
Revolving to Term	0	0
Total loans	1,422	6,255
Commercial real estate | CRE investment | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	55	0
2021/2020	21	121
2020/2019	0	299
2019/2018	1,043	245
Prior	8,006	3,140
Revolving	0	209
Revolving to Term	0	0
Total loans	9,125	4,014
Commercial real estate | Construction & land development
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	37,227	104,874
2022/2021	153,835	140,727
2021/2020	88,339	12,188
2020/2019	10,885	9,761
2019/2018	5,796	23,811
Prior	28,510	14,004
Revolving	2,155	13,235
Revolving to Term	0	0
Total loans	326,747	318,600
Commercial real estate | Construction & land development | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	37,180	104,804
2022/2021	153,809	140,727
2021/2020	88,212	12,188
2020/2019	9,610	9,747
2019/2018	5,288	23,811
Prior	28,329	13,138
Revolving	2,070	13,235
Revolving to Term	0	0
Total loans	324,498	317,650
Commercial real estate | Construction & land development | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	37
2022/2021	26	0
2021/2020	127	0
2020/2019	1,275	14
2019/2018	508	0
Prior	89	95
Revolving	0	0
Revolving to Term	0	0
Total loans	2,025	146
Commercial real estate | Construction & land development | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Commercial real estate | Construction & land development | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	47	33
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	92	771
Revolving	85	0
Revolving to Term	0	0
Total loans	224	804
Residential | Residential first mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	125,176	320,276
2022/2021	378,921	273,098
2021/2020	258,354	149,042
2020/2019	135,782	71,838
2019/2018	62,893	33,677
Prior	175,005	166,921
Revolving	614	2,080
Revolving to Term	3	3
Total loans	1,136,748	1,016,935
Residential | Residential first mortgage | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	125,176	318,628
2022/2021	377,475	272,011
2021/2020	256,628	147,857
2020/2019	134,035	68,975
2019/2018	59,281	31,208
Prior	168,739	162,153
Revolving	614	2,080
Revolving to Term	3	3
Total loans	1,121,951	1,002,915
Residential | Residential first mortgage | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	1,494
2022/2021	1,296	758
2021/2020	1,259	997
2020/2019	1,262	1,803
2019/2018	2,538	2,272
Prior	2,684	465
Revolving	0	0
Revolving to Term	0	0
Total loans	9,039	7,789
Residential | Residential first mortgage | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	711
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	711
Residential | Residential first mortgage | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	154
2022/2021	150	329
2021/2020	467	188
2020/2019	485	349
2019/2018	1,074	197
Prior	3,582	4,303
Revolving	0	0
Revolving to Term	0	0
Total loans	5,758	5,520
Residential | Residential junior mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	12,538	10,119
2022/2021	7,639	4,786
2021/2020	4,117	5,207
2020/2019	4,360	3,151
2019/2018	2,848	1,573
Prior	4,124	3,576
Revolving	153,360	143,158
Revolving to Term	6,446	5,762
Total loans	195,432	177,332
Residential | Residential junior mortgage | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	12,538	10,119
2022/2021	7,607	4,580
2021/2020	3,915	5,207
2020/2019	4,360	3,151
2019/2018	2,848	1,573
Prior	4,110	3,409
Revolving	153,322	142,784
Revolving to Term	6,446	5,762
Total loans	195,146	176,585
Residential | Residential junior mortgage | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	143
Revolving	0	165
Revolving to Term	0	0
Total loans	0	308
Residential | Residential junior mortgage | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Residential | Residential junior mortgage | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	32	206
2021/2020	202	0
2020/2019	0	0
2019/2018	0	0
Prior	14	24
Revolving	38	209
Revolving to Term	0	0
Total loans	286	439
Residential | Residential construction
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	35,996	92,417
2022/2021	32,539	16,774
2021/2020	5,279	966
2020/2019	1,101	123
2019/2018	125	336
Prior	1,209	229
Revolving	40	3,547
Revolving to Term	0	0
Total loans	76,289	114,392
Residential | Residential construction | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	35,996	92,417
2022/2021	32,539	16,774
2021/2020	5,279	966
2020/2019	1,101	123
2019/2018	125	336
Prior	1,209	229
Revolving	40	3,547
Revolving to Term	0	0
Total loans	76,289	114,392
Residential | Residential construction | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Residential | Residential construction | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Residential | Residential construction | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	$ 0	$ 0

Loans, Allowance for Credit _12

Loans, Allowance for Credit Losses - Loans, and Credit Quality - Schedule of Aggregated by Portfolio Segment and Type of Modification (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Financing Receivable, Impaired [Line Items]
Total	$ 627
% of Total Loans	0.01%
Payment Delay
Financing Receivable, Impaired [Line Items]
Total	$ 540
Term Extension
Financing Receivable, Impaired [Line Items]
Total	0
Interest Rate Reduction
Financing Receivable, Impaired [Line Items]
Total	87
Term Extension & Interest Rate Reduction
Financing Receivable, Impaired [Line Items]
Total	0
Commercial & industrial | Commercial
Financing Receivable, Impaired [Line Items]
Total	$ 520
% of Total Loans	0.04%
Commercial & industrial | Payment Delay | Commercial
Financing Receivable, Impaired [Line Items]
Total	$ 433
Commercial & industrial | Term Extension | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
Commercial & industrial | Interest Rate Reduction | Commercial
Financing Receivable, Impaired [Line Items]
Total	87
Commercial & industrial | Term Extension & Interest Rate Reduction | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
Owner-occupied CRE | Commercial
Financing Receivable, Impaired [Line Items]
Total	$ 0
% of Total Loans	0%
Owner-occupied CRE | Payment Delay | Commercial
Financing Receivable, Impaired [Line Items]
Total	$ 0
Owner-occupied CRE | Term Extension | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
Owner-occupied CRE | Interest Rate Reduction | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
Owner-occupied CRE | Term Extension & Interest Rate Reduction | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
Agricultural | Commercial
Financing Receivable, Impaired [Line Items]
Total	$ 107
% of Total Loans	0.01%
Agricultural | Payment Delay | Commercial
Financing Receivable, Impaired [Line Items]
Total	$ 107
Agricultural | Term Extension | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
Agricultural | Interest Rate Reduction | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
Agricultural | Term Extension & Interest Rate Reduction | Commercial
Financing Receivable, Impaired [Line Items]
Total	0
CRE investment | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	$ 0
% of Total Loans	0%
CRE investment | Payment Delay | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	$ 0
CRE investment | Term Extension | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	0
CRE investment | Interest Rate Reduction | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	0
CRE investment | Term Extension & Interest Rate Reduction | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	0
Construction & land development | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	$ 0
% of Total Loans	0%
Construction & land development | Payment Delay | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	$ 0
Construction & land development | Term Extension | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	0
Construction & land development | Interest Rate Reduction | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	0
Construction & land development | Term Extension & Interest Rate Reduction | Commercial real estate
Financing Receivable, Impaired [Line Items]
Total	0
Residential first mortgage | Residential first mortgage
Financing Receivable, Impaired [Line Items]
Total	$ 0
% of Total Loans	0%
Residential first mortgage | Payment Delay | Residential first mortgage
Financing Receivable, Impaired [Line Items]
Total	$ 0
Residential first mortgage | Term Extension | Residential first mortgage
Financing Receivable, Impaired [Line Items]
Total	0
Residential first mortgage | Interest Rate Reduction | Residential first mortgage
Financing Receivable, Impaired [Line Items]
Total	0
Residential first mortgage | Term Extension & Interest Rate Reduction | Residential first mortgage
Financing Receivable, Impaired [Line Items]
Total	$ 0

Goodwill and Other Intangible_3

Goodwill and Other Intangibles and Servicing Rights - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 367,387	$ 367,387	$ 317,189
Other intangibles	28,821	35,051
Goodwill and other intangibles, net	396,208	402,438
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Other intangibles	26,842	32,701
Customer list intangibles
Finite-Lived Intangible Assets [Line Items]
Other intangibles	$ 1,979	$ 2,350

Goodwill and Other Intangible_4

Goodwill and Other Intangibles and Servicing Rights - Schedule of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Goodwill:
Goodwill at beginning of year	$ 367,387	$ 317,189
Acquisitions	0	49,970
Purchase accounting adjustment	0	228
Goodwill at end of period	$ 367,387	$ 367,387

Goodwill and Other Intangible_5

Goodwill and Other Intangibles and Servicing Rights - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Net book value	$ 28,821		$ 28,821		$ 35,051
Amortization during the period	1,986	$ 1,628	6,230	$ 4,399
Core deposit intangibles:
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	60,724		60,724		60,724
Accumulated amortization	(33,882)		(33,882)		(28,023)
Net book value	26,842		26,842		32,701
Additions during the period			0		19,364
Amortization during the period			5,859		6,108
Customer list intangibles:
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,523		5,523		5,523
Accumulated amortization	(3,544)		(3,544)		(3,173)
Net book value	$ 1,979		1,979		2,350
Amortization during the period			$ 371		$ 508

Goodwill and Other Intangible_6

Goodwill and Other Intangibles and Servicing Rights - Schedule of Mortgage and Loan Servicing Rights (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Mortgage Servicing Rights
Mortgage servicing rights asset:
MSR asset at beginning of year	$ 13,080	$ 13,636
Capitalized MSR	1,104	2,327
Amortization during the period	(2,248)	(2,883)
MSR asset at end of period	11,936	13,080
Valuation Allowance:
Valuation allowance at beginning of year	(500)	(1,200)
Reversals	500	700
Valuation allowance at end of period	0	(500)
MSR asset, net	11,936	12,580
Fair value of MSR asset at end of period	15,847	17,215
Residential mortgage loans serviced for others	$ 1,610,318	$ 1,637,109
Net book value of MSR asset to loans serviced for others	0.74%	0.77%
LSR asset
Mortgage servicing rights asset:
MSR asset at beginning of year	$ 11,039	$ 20,055
Amortization during the period	(1,656)	(9,016)
MSR asset at end of period	9,383	11,039
Valuation Allowance:
Residential mortgage loans serviced for others	$ 502,901	$ 538,392

Goodwill and Other Intangible_7

Goodwill and Other Intangibles and Servicing Rights - Schedule of Estimated Future Amortization Expense for Amortizing Intangible Assets and the MSR Asset (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Net book value	$ 28,821	$ 35,051
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
2023 (remaining three months)	1,730
2024	6,298
2025	5,161
2026	3,983
2027	3,218
2028	2,622
Thereafter	3,830
Net book value	26,842	32,701
Customer list intangibles
Finite-Lived Intangible Assets [Line Items]
2023 (remaining three months)	112
2024	449
2025	449
2026	249
2027	166
2028	166
Thereafter	388
Net book value	1,979	$ 2,350
MSR asset
Finite-Lived Intangible Assets [Line Items]
2023 (remaining three months)	687
2024	2,661
2025	1,978
2026	1,457
2027	1,457
2028	1,456
Thereafter	2,240
Net book value	11,936
LSR asset
Finite-Lived Intangible Assets [Line Items]
2023 (remaining three months)	552
2024	1,962
2025	1,717
2026	1,472
2027	1,227
2028	981
Thereafter	1,472
Net book value	$ 9,383

Short and Long-Term Borrowing_2

Short and Long-Term Borrowings - Narrative (Details)	1 Months Ended
	Dec. 31, 2021 USD ($) note	Jul. 31, 2021 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument
Short-term borrowings			$ 0	$ 317,000,000
Trust preferred securities qualify as Tier 1 capital			$ 39,000,000	$ 38,000,000
FHLB advances
Debt Instrument
FHLB weighted average interest rate at period end			1.55%	1.09%
Subordinated notes
Debt Instrument
Face amount issued			$ 152,400,000
Number of notes assumed | note	2
Subordinated Notes due 2031 | Subordinated notes
Debt Instrument
Face amount issued		$ 100,000,000	100,000,000
Subordinated Notes due 2031 | Subordinated notes | Interest Rate For The Years One Through 5
Debt Instrument
Fixed interest rate		3.125%
Subordinated Notes due 2031 | Subordinated notes | Interest Rate After Year Five | SOFR
Debt Instrument
Floating interest rate basis spread		2.375%
County Subordinated Notes due 2028 | Subordinated notes
Debt Instrument
Face amount issued	$ 30,000,000		30,000,000
County Subordinated Notes due 2028 | Subordinated notes | Interest Rate For The Years One Through 5
Debt Instrument
Fixed interest rate	5.875%
County Subordinated Notes due 2028 | Subordinated notes | Interest Rate After Year Five | SOFR
Debt Instrument
Floating interest rate basis spread	2.88%
County Subordinated Notes due 2030 | Subordinated notes
Debt Instrument
Face amount issued	$ 22,000,000		$ 22,400,000
County Subordinated Notes due 2030 | Subordinated notes | Interest Rate For The Years One Through 5
Debt Instrument
Fixed interest rate	7%
County Subordinated Notes due 2030 | Subordinated notes | Interest Rate After Year Five | SOFR
Debt Instrument
Floating interest rate basis spread	6.875%
FHLB advances
Debt Instrument
Short-term borrowings				$ 317,000,000
FHLB advances | Maturing September 2023
Debt Instrument
Short-term borrowings				$ 200,000,000
Weighted average interest rate on short-term debt				4.30%
FHLB advances | Maturing January 2023
Debt Instrument
Short-term borrowings				$ 117,000,000
Weighted average interest rate on short-term debt				4.29%

Short and Long-Term Borrowing_3

Short and Long-Term Borrowings - Schedule of Components of Long-term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument
Total long-term borrowings	$ 197,754	$ 225,342
FHLB advances
Debt Instrument
Total long-term borrowings	5,000	33,000
Junior subordinated debentures
Debt Instrument
Total long-term borrowings	40,344	39,720
Subordinated notes
Debt Instrument
Total long-term borrowings	$ 152,410	$ 152,622

Short and Long-Term Borrowing_4

Short and Long-Term Borrowings - Schedule of Junior Subordinated Debentures and Subordinated Notes (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 31, 2021
Debt Instrument [Line Items]
Carrying Value	$ 197,754,000	$ 225,342,000
Junior subordinated debentures
Debt Instrument [Line Items]
Par	48,045,000
Unamortized Premium /(Discount) / Debt Issue Costs	(7,701,000)
Carrying Value	$ 40,344,000	$ 39,720,000
Junior subordinated debentures | 2005 Mid-Wisconsin Financial Services, Inc.
Debt Instrument [Line Items]
Interest Rate	7.10%	6.20%
Par	$ 10,310,000
Unamortized Premium /(Discount) / Debt Issue Costs	(2,429,000)
Carrying Value	$ 7,881,000	$ 7,734,000
Junior subordinated debentures | 2006 Baylake Corp.
Debt Instrument [Line Items]
Interest Rate	7.01%	6.08%
Par	$ 16,598,000
Unamortized Premium /(Discount) / Debt Issue Costs	(2,997,000)
Carrying Value	$ 13,601,000	$ 13,424,000
Junior subordinated debentures | 2004 First Menasha Bancshares, Inc.
Debt Instrument [Line Items]
Interest Rate	8.46%	7.53%
Par	$ 5,155,000
Unamortized Premium /(Discount) / Debt Issue Costs	(454,000)
Carrying Value	$ 4,701,000	$ 4,668,000
Junior subordinated debentures | County Bancorp Statutory Trust II
Debt Instrument [Line Items]
Interest Rate	7.20%	6.30%
Par	$ 6,186,000
Unamortized Premium /(Discount) / Debt Issue Costs	(792,000)
Carrying Value	$ 5,394,000	$ 5,277,000
Junior subordinated debentures | County Bancorp Statutory Trust III
Debt Instrument [Line Items]
Interest Rate	7.36%	6.46%
Par	$ 6,186,000
Unamortized Premium /(Discount) / Debt Issue Costs	(850,000)
Carrying Value	$ 5,336,000	$ 5,219,000
Junior subordinated debentures | Fox River Valley Capital Trust
Debt Instrument [Line Items]
Interest Rate	6.40%	6.40%
Par	$ 3,610,000
Unamortized Premium /(Discount) / Debt Issue Costs	(179,000)
Carrying Value	$ 3,431,000	$ 3,398,000
Junior subordinated debentures | SOFR
Debt Instrument [Line Items]
Adjustment on variable rate	0.26161%
Junior subordinated debentures | SOFR | 2005 Mid-Wisconsin Financial Services, Inc.
Debt Instrument [Line Items]
Floating interest rate basis spread	1.43%
Junior subordinated debentures | SOFR | 2006 Baylake Corp.
Debt Instrument [Line Items]
Floating interest rate basis spread	1.35%
Junior subordinated debentures | SOFR | 2004 First Menasha Bancshares, Inc.
Debt Instrument [Line Items]
Floating interest rate basis spread	2.79%
Junior subordinated debentures | SOFR | County Bancorp Statutory Trust II
Debt Instrument [Line Items]
Floating interest rate basis spread	1.53%
Junior subordinated debentures | SOFR | County Bancorp Statutory Trust III
Debt Instrument [Line Items]
Floating interest rate basis spread	1.69%
Junior subordinated debentures | SOFR | Fox River Valley Capital Trust
Debt Instrument [Line Items]
Floating interest rate basis spread	3.40%
Subordinated notes
Debt Instrument [Line Items]
Par	$ 152,400,000
Unamortized Premium /(Discount) / Debt Issue Costs	10,000
Carrying Value	$ 152,410,000	$ 152,622,000
Subordinated notes | Subordinated Notes due 2031
Debt Instrument [Line Items]
Interest Rate	3.13%	3.13%
Par	$ 100,000,000			$ 100,000,000
Unamortized Premium /(Discount) / Debt Issue Costs	(576,000)
Carrying Value	$ 99,424,000	$ 99,267,000
Subordinated notes | County Subordinated Notes due 2028
Debt Instrument [Line Items]
Interest Rate	8.56%	5.88%
Par	$ 30,000,000		$ 30,000,000
Unamortized Premium /(Discount) / Debt Issue Costs	0
Carrying Value	$ 30,000,000	$ 30,119,000
Subordinated notes | County Subordinated Notes due 2030
Debt Instrument [Line Items]
Interest Rate	7%	7%
Par	$ 22,400,000		$ 22,000,000
Unamortized Premium /(Discount) / Debt Issue Costs	586,000
Carrying Value	$ 22,986,000	$ 23,236,000

Commitment and Contingencies -

Commitment and Contingencies - Schedule of the Contract or Notional Amount of Exposure to Off-balance-sheet Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Commitments to extend credit
Other Commitments [Line Items]
Contract and notional amounts of commitments	$ 1,810,068	$ 1,850,601
Financial standby letters of credit
Other Commitments [Line Items]
Contract and notional amounts of commitments	18,235	26,530
Performance standby letters of credit
Other Commitments [Line Items]
Contract and notional amounts of commitments	$ 15,814	$ 9,375

Commitment and Contingencies _2

Commitment and Contingencies - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative fair value, net	$ 0.2	$ 0.1
Interest Rate Lock Commitments
Derivative [Line Items]
Commitments to sell residential mortgage loans held for sale considered derivative instruments	16	9
Forward Contracts
Derivative [Line Items]
Commitments to sell residential mortgage loans held for sale considered derivative instruments	$ 17	$ 9

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a 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]
Securities AFS	$ 793,826	$ 917,618
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	37,504	183,830
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	8,221	2,100
State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	341,330	398,188
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	306,409	200,932
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	100,362	132,568
Reccurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	793,826	917,618
Derivative assets	186	60
Derivative liabilities	0	10
Reccurring | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	37,504	183,830
Reccurring | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	8,221	2,100
Reccurring | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	341,330	398,188
Reccurring | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	306,409	200,932
Reccurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	100,362	132,568
Reccurring | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	3,893	4,376
Reccurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Reccurring | Level 1 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Reccurring | Level 1 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Reccurring | Level 1 | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Reccurring | Level 1 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Reccurring | Level 1 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Reccurring | Level 1 | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	3,893	4,376
Reccurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	788,176	909,465
Derivative assets	0	0
Derivative liabilities	0	0
Reccurring | Level 2 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	37,504	183,830
Reccurring | Level 2 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	8,221	2,100
Reccurring | Level 2 | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	339,949	396,315
Reccurring | Level 2 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	305,438	199,951
Reccurring | Level 2 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	97,064	127,269
Reccurring | Level 2 | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	0	0
Reccurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	5,650	8,153
Derivative assets	186	60
Derivative liabilities	0	10
Reccurring | Level 3 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Reccurring | Level 3 | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	0	0
Reccurring | Level 3 | State, county and municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	1,381	1,873
Reccurring | Level 3 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	971	981
Reccurring | Level 3 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities AFS	3,298	5,299
Reccurring | Level 3 | Other investments (equity securities)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments (equity securities)	$ 0	$ 0

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Securities AFS - Recurring - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Level 3 Fair Value Measurements:
Balance at beginning of year	$ 8,153	$ 8,065
Acquired balance	0	750
Unrealized gain / (loss)	(34)	(211)
Balance at end of period	5,650	8,153
Level 3
Level 3 Fair Value Measurements:
Maturities / Paydowns	$ (2,469)	$ (451)

Fair Value Measurements - Sch_3

Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Measured at Fair Value on a Nonrecurring Basis - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Collateral dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 22,925	$ 30,951
Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,031	1,975
MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	11,936	12,580
Level 1 | Collateral dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Level 1 | Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Level 1 | MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Level 2 | Collateral dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Level 2 | Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Level 2 | MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
Level 3 | Collateral dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	22,925	30,951
Level 3 | Other real estate owned (“OREO”)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,031	1,975
Level 3 | MSR asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	$ 11,936	$ 12,580

Fair Value Measurements - Sch_4

Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets:
Securities AFS	$ 793,826	$ 917,618
Securities HTM		623,352
Carrying Amount
Financial assets:
Cash and cash equivalents	545,880	154,723
Certificates of deposit in other banks	7,598	12,518
Securities AFS	793,826	917,618
Securities HTM		679,128
Other investments, including equity securities	58,367	65,286
Loans held for sale	6,500	1,482
Loans, net	6,176,097	6,118,670
Accrued interest receivable	24,166	21,275
Financial liabilities:
Deposits	7,182,388	7,178,921
Short-term borrowings	0	317,000
Long-term borrowings	197,754	225,342
Accrued interest payable	7,028	4,265
Carrying Amount | MSR asset
Financial assets:
MSR asset	11,936	12,580
Carrying Amount | LSR asset
Financial assets:
MSR asset	9,383	11,039
Estimated Fair Value
Financial assets:
Cash and cash equivalents	545,880	154,723
Certificates of deposit in other banks	7,519	12,407
Securities AFS	793,826	917,618
Securities HTM		623,352
Other investments, including equity securities	58,367	65,286
Loans held for sale	6,641	1,529
Loans, net	5,908,160	5,863,570
Accrued interest receivable	24,166	21,275
Financial liabilities:
Deposits	7,164,174	7,172,779
Short-term borrowings	0	317,000
Long-term borrowings	190,738	220,513
Accrued interest payable	7,028	4,265
Estimated Fair Value | MSR asset
Financial assets:
MSR asset	15,847	17,215
Estimated Fair Value | LSR asset
Financial assets:
MSR asset	9,383	11,039
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	545,880	154,723
Certificates of deposit in other banks	0	0
Securities AFS	0	0
Securities HTM		0
Other investments, including equity securities	3,893	4,376
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	24,166	21,275
Financial liabilities:
Deposits	0	0
Short-term borrowings	0	317,000
Long-term borrowings	0	0
Accrued interest payable	7,028	4,265
Estimated Fair Value | Level 1 | MSR asset
Financial assets:
MSR asset	0	0
Estimated Fair Value | Level 1 | LSR asset
Financial assets:
MSR asset	0	0
Estimated Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Certificates of deposit in other banks	7,519	12,407
Securities AFS	788,176	909,465
Securities HTM		623,352
Other investments, including equity securities	43,973	52,093
Loans held for sale	6,641	1,529
Loans, net	0	0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	4,736	33,001
Accrued interest payable	0	0
Estimated Fair Value | Level 2 | MSR asset
Financial assets:
MSR asset	0	0
Estimated Fair Value | Level 2 | LSR asset
Financial assets:
MSR asset	0	0
Estimated Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Certificates of deposit in other banks	0	0
Securities AFS	5,650	8,153
Securities HTM		0
Other investments, including equity securities	10,501	8,817
Loans held for sale	0	0
Loans, net	5,908,160	5,863,570
Accrued interest receivable	0	0
Financial liabilities:
Deposits	7,164,174	7,172,779
Short-term borrowings	0	0
Long-term borrowings	186,002	187,512
Accrued interest payable	0	0
Estimated Fair Value | Level 3 | MSR asset
Financial assets:
MSR asset	15,847	17,215
Estimated Fair Value | Level 3 | LSR asset
Financial assets:
MSR asset	$ 9,383	$ 11,039

Subsequent Event (Details)

Subsequent Event (Details) - Subsequent Event $ in Millions	Oct. 02, 2023 USD ($)
Subsequent Event [Line Items]
Proceeds from Divestiture of Businesses	$ 10
Gain (Loss) on Disposition of Business	$ 9