Heartland Financial USA (HTLF) 10-Q 8 May 24 2024 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2024	May 07, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-15393
Entity Registrant Name	HEARTLAND FINANCIAL USA, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	42-1405748
Entity Address, Address Line One	1800 Larimer Street, Suite 1800
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80202
City Area Code	303
Local Phone Number	285-9200
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		42,790,564
Entity Central Index Key	0000920112
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock, par value $1.00 per share
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $1.00 per share
Trading Symbol	HTLF
Security Exchange Name	NASDAQ
Depositary Shares, each representing 1/400th interest in a share of 7.00% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing 1/400th interest in a share of 7.00% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E
Trading Symbol	HTLFP
Security Exchange Name	NASDAQ

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Cash and due from banks	$ 208,176	$ 275,554
Interest bearing deposits with other banks and other short-term investments	236,190	47,459
Cash and cash equivalents	444,366	323,013
Time deposits in other financial institutions	1,240	1,240
Securities:
Carried at fair value (cost of $4,886,304 at March 31, 2024, and $5,100,344 at December 31, 2023)	4,418,222	4,646,891
Held to maturity, net of allowance for credit losses of $0 at both March 31, 2024, and December 31, 2023 (fair value of $813,752 at March 31, 2024, and $816,399 at December 31, 2023)	841,055	838,241
Other investments, at cost	68,524	91,277
Loans held for sale	352,744	5,071
Loans receivable:
Held to maturity	11,644,641	12,068,645
Allowance for credit losses	(123,934)	(122,566)
Loans receivable, net	11,520,707	11,946,079
Premises, furniture and equipment, net	160,518	177,001
Premises, furniture and equipment held for sale	16,064	4,069
Other real estate, net	2,590	12,548
Goodwill	576,005	576,005
Core deposit intangibles, net	16,923	18,415
Cash surrender value on life insurance	197,671	197,085
Other assets	516,198	574,772
TOTAL ASSETS	19,132,827	19,411,707
Deposits:
Demand	4,264,390	4,500,304
Savings	8,669,221	8,805,597
Time	2,368,555	2,895,813
Total deposits	15,302,166	16,201,714
Deposits held for sale	596,328	0
Borrowings	650,033	622,255
Term debt	372,652	372,396
Accrued expenses and other liabilities	232,815	282,225
TOTAL LIABILITIES	17,153,994	17,478,590
STOCKHOLDERS' EQUITY:
Common stock (par value $1 per share; 60,000,000 shares authorized at both March 31, 2024, and December 31, 2023; issued 42,783,670 shares at March 31, 2024, and 42,688,008 shares at December 31, 2023)	42,784	42,688
Capital surplus	1,093,207	1,090,740
Retained earnings	1,178,330	1,141,501
Accumulated other comprehensive loss	(446,193)	(452,517)
TOTAL STOCKHOLDERS' EQUITY	1,978,833	1,933,117
TOTAL LIABILITIES AND EQUITY	19,132,827	19,411,707
Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 0	$ 0
Preferred stock, shares outstanding (in shares)	0	0
Series E Fixed-Rate Reset Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 110,705	$ 110,705
Preferred stock, shares outstanding (in shares)	11,500	11,500

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Marketable securities, amortized cost	$ 4,886,304	$ 5,100,344
Held to maturity	$ 841,055	$ 838,241
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	42,783,670	42,688,008
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	188,500	188,500
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series E Fixed-Rate Reset Cumulative Perpetual Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	11,500	11,500
Preferred stock, shares issued (in shares)	11,500	11,500
Preferred stock, shares outstanding (in shares)	11,500	11,500
Significant Other Observable Inputs (Level 2)
Held to maturity	$ 813,752	$ 816,399
Obligations of states and political subdivisions
Held to maturity, allowance for credit losses	0	0
Held to maturity	$ 841,055	$ 838,241

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
INTEREST INCOME:
Interest and fees on loans	$ 195,661	$ 153,843
Interest on securities:
Taxable	47,014	55,976
Nontaxable	6,041	6,028
Interest on interest bearing deposits in other financial institutions	3,006	1,131
TOTAL INTEREST INCOME	251,722	216,978
INTEREST EXPENSE:
Interest on deposits	84,134	56,898
Interest on borrowings	7,524	2,422
Interest on term debt (includes $(35) and $591 of interest (income) expense related to derivatives reclassified from accumulated other comprehensive loss for the three months ended March 31, 2024 and 2023, respectively)	5,849	5,446
TOTAL INTEREST EXPENSE	97,507	64,766
NET INTEREST INCOME	154,215	152,212
Provision for credit losses	986	3,074
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	153,229	149,138
NONINTEREST INCOME:
Loan servicing income	131	714
Securities (losses) gains, net (includes $58 and $(1,104) of net security gains (losses) reclassified from accumulated other comprehensive loss for the three months ended March 31, 2024 and 2023, respectively)	58	(1,104)
Unrealized gain (loss) on equity securities, net	95	193
Net gains on sale of loans held for sale	104	1,831
Income on bank owned life insurance	1,177	964
Other noninterest income	2,347	1,463
TOTAL NONINTEREST INCOME	27,663	29,999
NONINTEREST EXPENSES:
Salaries and employee benefits	63,955	62,149
Occupancy	7,263	7,209
Furniture and equipment	2,337	2,915
Professional fees	15,531	12,797
FDIC insurance assessments	4,969	3,279
Advertising	1,358	1,985
Core deposit intangibles and customer relationship intangibles amortization	1,492	1,788
Other real estate and loan collection expenses	512	155
Loss (gain) on sales/valuations of assets, net	214	1,115
Acquisition, integration and restructuring costs	1,375	1,673
Partnership investment in tax credit projects	494	538
Other noninterest expenses	14,095	15,440
TOTAL NONINTEREST EXPENSES	113,595	111,043
INCOME BEFORE INCOME TAXES	67,297	68,094
Income taxes (includes $5,762 and $426 of income tax benefit reclassified from accumulated other comprehensive loss for the three months ended March 31, 2024 and 2023, respectively)	15,590	15,318
NET INCOME	51,707	52,776
Preferred dividends	(2,013)	(2,013)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 49,694	$ 50,763
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 1.16	$ 1.19
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	1.16	1.19
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.30	$ 0.30
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 17,063	$ 17,136
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	5,043	5,657
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	754	696
Capital markets fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 891	$ 2,449

CONSOLIDATED STATEMENTS OF IN_2

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net security gains (loss)	$ 58	$ (1,104)
Income tax expense (benefit)	15,590	15,318
Reclassification out of accumulated other comprehensive income (loss) | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Interest benefit	(35)	591
Reclassification out of accumulated other comprehensive income (loss) | Accumulated Net Unrealized Investment Gain (Loss)
Net security gains (loss)	58	(1,104)
Reclassification out of accumulated other comprehensive income (loss) | Accumulated Other Comprehensive Loss
Income tax expense (benefit)	$ 5,762	$ 426

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 51,707	$ 52,776
Changes in available for sale ("AFS") securities:
Net change in unrealized gain (loss) on securities	(14,629)	66,167
Reclassification adjustment for net (gains) losses on hedged AFS securities	20,151	0
Reclassification adjustment for net (gains) losses realized in net income	0	1,104
Income tax benefit (expense)	(1,371)	(17,921)
Other comprehensive income (loss) on AFS securities	4,151	49,350
Changes in securities held to maturity:
Net amortization of unrealized losses on securities transferred from AFS	2,843	2,740
Income tax benefit (expense)	(705)	(1,060)
Other comprehensive income (loss) on held to maturity securities	2,138	1,680
Change in cash flow hedges:
Net change in unrealized gain on derivatives	0	1,952
Reclassification adjustment for net (gains) losses on derivatives realized in net income	34	764
Income tax benefit (expense)	1	(659)
Other comprehensive income (loss) on cash flow hedges	35	2,057
Other comprehensive income (loss)	6,324	53,087
TOTAL COMPREHENSIVE INCOME (LOSS)	$ 58,031	$ 105,863

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 51,707	$ 52,776
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,567	5,484
Provision for credit losses	986	3,074
Net amortization of premium on securities	4,894	7,159
Securities losses (gains), net	(58)	1,104
Unrealized loss (gain) on equity securities, net	(95)	(193)
Stock based compensation	3,746	4,719
Loans originated for sale	0	(43,257)
Proceeds on sales of loans held for sale	5,175	39,916
Net gains on sale of loans held for sale	(104)	(1,807)
(Increase) decrease in accrued interest receivable	1,731	(130)
Decrease (increase) in prepaid expenses	(1,729)	806
Increase (decrease) in accrued interest payable	(1,151)	13,462
Capitalization of servicing rights	0	(24)
Loss (gain) on sales/valuations of assets, net	214	1,115
Net excess tax benefit (expense) from stock based compensation	(418)	46
Income from fair value hedge activity	416	0
Other, net	60,381	(9,818)
NET CASH PROVIDED BY OPERATING ACTIVITIES	130,262	74,432
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of securities available for sale	0	146,448
Proceeds from the maturity of and principal paydowns on securities available for sale	251,683	150,941
Proceeds from the maturity of and principal paydowns on securities held to maturity	71	69
Proceeds from the sale, maturity of, redemption of and principal paydowns on other investments	23,849	3,644
Purchase of securities available for sale	(42,484)	(187,726)
Purchase of other investments	(1,038)	(1,441)
Net (increase) decrease in loans	38,429	(66,180)
Purchase of bank owned life insurance policies	(56)	(51)
Proceeds from sale of mortgage servicing rights	0	6,714
Capital expenditures and investments	(565)	(248)
Proceeds from the sale of premises, furniture and equipment	1,375	1,270
Proceeds on sale of OREO and other repossessed assets	9,826	1,136
NET CASH PROVIDED BY INVESTING ACTIVITIES	281,090	54,576
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in demand deposits	(91,892)	(581,786)
Net increase (decrease) in savings deposits	193,906	(737,782)
Net increase (decrease) in time deposit accounts	(405,234)	1,487,905
Net increase (decrease) in borrowings	48,964	(234,780)
Proceeds from Bank Term Funding Program advances	500,000	0
Proceeds from short term FHLB advances	0	1,000
Repayments of short term FHLB advances	(521,186)	(50,000)
Repayments of term debt	0	(30)
Proceeds from issuance of common stock	263	242
Dividends paid	(14,820)	(14,753)
NET CASH USED BY FINANCING ACTIVITIES	(289,999)	(129,984)
Net increase (decrease) in cash and cash equivalents	121,353	(976)
Cash and cash equivalents at beginning of year	323,013	363,087
CASH AND CASH EQUIVALENTS AT END OF PERIOD	444,366	362,111
Supplemental disclosures:
Cash paid for income/franchise taxes	39	1,264
Cash paid for interest	98,658	51,304
Loans transferred to OREO	0	211
Transfer of premises from premises, furniture and equipment, net, to premises, furniture and equipment held for sale	13,155	3,741
Transfer of premises from premises, furniture and equipment held for sale to premises, furniture and equipment, net	0	5,167
Deposits transferred to held for sale	596,328	0
Loans transferred to held for sale	352,744	0
Dividends declared, not paid	$ 2,071	$ 2,013

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period at Dec. 31, 2022	$ 1,735,055	$ 110,705	$ 42,467	$ 1,080,964	$ 1,120,925	$ (620,006)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	105,863				52,776	53,087
Cash dividends declared:
Preferred	(2,013)				(2,013)
Common	(12,740)				(12,740)
Issuance of shares of common stock	(1,479)		92	(1,571)
Stock based compensation	4,719			4,719
Balance at end of period at Mar. 31, 2023	1,829,405	110,705	42,559	1,084,112	1,158,948	(566,919)
Balance at beginning of period at Dec. 31, 2023	1,933,117	110,705	42,688	1,090,740	1,141,501	(452,517)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	58,031				51,707	6,324
Cash dividends declared:
Preferred	(2,013)				(2,013)
Common	(12,865)				(12,865)
Issuance of shares of common stock	(1,183)		96	(1,279)
Stock based compensation	3,746			3,746
Balance at end of period at Mar. 31, 2024	$ 1,978,833	$ 110,705	$ 42,784	$ 1,093,207	$ 1,178,330	$ (446,193)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends per share preferred stock (in dollars per share)	$ 175	$ 175
Cash dividends per share common stock (in dollars per share)	$ 0.30	$ 0.30
Shares of common stock issued (in shares)	95,662	91,332

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The interim unaudited consolidated financial statements contained herein should be read in conjunction with the audited consolidated financial statements and accompanying notes to the consolidated financial statements for the fiscal year ended December 31, 2023, included in the Annual Report on Form 10-K of Heartland Financial USA, Inc. ("HTLF") filed with the Securities and Exchange Commission ("SEC") on February 23, 2024 . Foot note disclosures to the interim unaudited consolidated financial statements which would substantially duplicate the disclosure contained in the footnotes to the audited consolidated financial statements have been omitted. The financial information included herein has been prepared in accordance with U.S. generally accepted accounting principles for interim financial reporting and has been prepared pursuant to the rules and regulations for reporting on Form 10-Q and Rule 10-01 of Regulation S-X. Such information reflects all adjustments (consisting of normal recurring adjustments), that are, in the opinion of management, necessary for a fair presentation of the financial position and results of operations for the periods presented. The results of the interim period ended March 31, 2024, are not necessarily indicative of the results expected for the year ending December 31, 2024. Earnings Per Share Basic earnings per share is determined using net income available to common stockholders and weighted average common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted average common shares and assumed incremental common shares issued. Amounts used in the determination of basic and diluted earnings per share for the three months ended March 31, 2024 and 2023, are shown in the table below, dollars and number of shares in thousands, except per share data: Three Months Ended 2024 2023 Net income attributable to HTLF $ 51,707 $ 52,776 Preferred dividends (2,013) (2,013) Net income available to common stockholders $ 49,694 $ 50,763 Weighted average common shares outstanding for basic earnings per share 42,807 42,615 Assumed incremental common shares issued upon vesting of outstanding restricted stock units 109 128 Weighted average common shares for diluted earnings per share 42,916 42,743 Earnings per common share — basic $ 1.16 $ 1.19 Earnings per common share — diluted $ 1.16 $ 1.19 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation 27 50 Number of antidilutive stock options excluded from diluted earnings per share computation 53 61 Subsequent Events - On April 28, 2024 (the “Signing Date”), HTLF entered into an Agreement and Plan of Merger (the “Merger Agreement”) with UMB Financial Corporation, a Missouri corporation (“UMB”) and Blue Sky Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of UMB (“Blue Sky Merger Sub”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, (i) Blue Sky Merger Sub will merge with and into HTLF (the “Merger”), with HTLF surviving the Merger as a wholly owned subsidiary of UMB (the “Surviving Entity”) and (ii) immediately following the effective time of the Merger (the “Effective Time”) and as part of a single, integrated transaction, the Surviving Entity will merge with and into UMB (the “Second Merger”, and together with the Merger, the “Mergers”), with UMB surviving the Second Merger (the “Surviving Corporation”). On the day immediately following the closing date of the Mergers, UMB will cause HTLF’s wholly owned banking subsidiary, HTLF Bank, to merge with and into UMB’s wholly owned banking subsidiary, UMB Bank, National Association (the “Bank Merger”), with UMB Bank, National Association continuing as the surviving bank in the Bank Merger. The Merger Agreement was unanimously approved by the Board of Directors of each of HTLF and UMB. Upon the terms and subject to the conditions set forth in the Merger Agreement, at the Effective Time, each share of common stock, par value $1.00 per share, of HTLF (“HTLF Common Stock”) issued and outstanding immediately prior to the Effective Time, other than certain shares held by UMB or HTLF, will be converted into the right to receive 0.55 shares (the “Exchange Ratio,” and such shares, the “Merger Consideration”) of common stock, $1.00 par value, of UMB (“UMB Common Stock”) and cash in lieu of fractional shares. At the Effective Time, each share of 7.00% Fixed-Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share of HTLF (the “HTLF Preferred Stock”), issued and outstanding immediately before the Effective Time will be converted into the right to receive one share of a newly created series of preferred stock of UMB (“UMB Preferred Stock”) with such rights, preferences, privileges an d powers (including voting powers) as set forth in the Certificate of Designations attached as an exhibit to the Merger Agreement. HTLF has evaluated subsequent events that may require recognition or disclosure through the filing date of this Quarterly Report on Form 10-Q with the SEC and has concluded there are no other subsequent events that would require recognition in the accompanying consolidated financial statements. Effect of New Financial Accounting Standards ASU 2023-02 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 (a consensus of the Emerging Issues Task Force)." ASU 2023-02 expands the permitted use of the proportional amortization method, which is currently only available to low-income housing tax credit investments, to other tax equity investments if certain conditions are met. Under the proportional amortization method, the initial cost of an investment is amortized in proportion to the income tax benefits received and both the amortization of the investment and the income tax benefits received are recognized as a component of income tax expense. This ASU was effective on January 1, 2024. HTLF has elected to use the proportional amortization method for investments in low-income housing projects. The amendments in this ASU are not expected to have a material impact on the results of operations or financial position. ASU 2023-06 In October 2023, the FASB issued ASU 2023-06, "Disclosure Improvements: Codification Amendments in Response to the SEC's Disclosure Update and Simplification Initiative." The amendments in this Update modify the disclosure or presentation requirements of a variety of Topics in the Codification. Certain of the amendments represent clarifications to, or technical corrections of, the current requirements. Each amendment in the ASU will only become effective if the SEC removes the related disclosure or presentation requirement from its existing regulations by June 30, 2027. The amendments in this ASU are not expected to have a material impact on the results of operations or financial position. ASU 2023-07 In November 2023, the FASB issued ASU 2023-07, " Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures" to improve disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This update does not change how a public entity identifies its operating segments; however, it does require that an entity that has single reportable segment provide all the disclosures required by the amendments in this update. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. A public entity should apply the amendments in this update retrospectively to all prior periods presented in the consolidated financial statements. Early adoption is permitted. We currently have one reportable operating segment. This ASU will not impact our consolidated financial statements and will have minimal impact to our disclosures, requiring identification of the chief operating decision maker and the information used to make operating decisions and to allocate resources. ASU 2023-09 In December 2023, the FASB issued ASU 2023-09, “ Income Taxes (Topic 740): Improvements to Income Tax Disclosures” that require public business entities to annually disclose (1) specific categories in their rate reconciliation; (2) additional information for reconciling items that meet a quantitative threshold; (3) the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes; (4) the amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions in which the income taxes paid that meet a quantitative threshold; (5) income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign; and (6) income tax expense (or benefit) from continuing operations disaggregated by federal, state, and foreign. The ASU eliminates the requirement to disclose the nature and estimate of the range of the reasonably possible change in the unrecognized tax benefits balance in the next 12 months and to disclose the cumulative amount of each type of temporary difference when a deferred tax liability is not recognized because of the exceptions to comprehensive recognition of deferred taxes related to subsidiaries and corporate joint ventures. For public business entities, the amendments are effective for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments should be applied on a prospective basis, but retrospective application is permitted. HTLF is currently evaluating the impact of the standard and does not anticipate it will have a significant impact on the results of operations, financial position, or liquidity. Qualified Affordable Housing Investments HTLF elected to use the proportional amortization method for investments in low-income housing projects. HTLF’s net investments in low-income housing projects were $5.7 million and $5.9 million as of March 31, 2024, and December 31, 2023, respectively, and are included in other assets in the consolidated balance sheet. With respect to HTLF’s investment in low-income housing projects for the three months ended March 31, 2024, we recognized income tax credits and other income tax benefits of $257,000 and $33,000, respectively. The total income tax benefits of $290,000 are partially offset in the “income taxes” item in the consolidated statements of income by $235,000 of investment amortization recognized, for a net income tax benefit of $55,000. The cash flows related to the total income tax benefits are presented in the following line items in the statement of cash flows: • $55,000 Net Income Tax Benefit, in the "Net income" line item in operating activities; • $235,000 Investment Amortization, in the "Other, net" line item, which is an adjustment to reconcile net income (loss) to cash from (used for) operating activities; • $257,000 Tax Credits, in the "Other, net" line item, which is also an adjustment to reconcile net income (loss) to cash from (used for) operating activities; and • $33,000 Other Tax Benefits Recognized, in the "Other, net" line item, which is also an adjustment to reconcile net income (loss) to cash from (used for) operating activities. There was no non-income-tax-related activity or impairment losses related to the low-income housing investments this reporting period.

SECURITIES

SECURITIES	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The amortized cost, gross unrealized gains and losses, and estimated fair values of debt securities available for sale and equity securities with a readily determinable fair value that are carried at fair value as of March 31, 2024, and December 31, 2023, are summarized in the table below, in thousands: Amortized Gross Gross Estimated March 31, 2024 U.S. treasuries $ 32,481 $ — $ (259) $ 32,222 U.S. agencies 14,084 — (192) 13,892 Obligations of states and political subdivisions 836,830 5 (109,344) 727,491 Mortgage-backed securities - agency 1,590,782 13 (231,254) 1,359,541 Mortgage-backed securities - non-agency 1,542,986 37 (85,225) 1,457,798 Commercial mortgage-backed securities - agency 75,782 — (11,708) 64,074 Commercial mortgage-backed securities - non-agency 436,274 — (10,180) 426,094 Asset-backed securities 214,676 — (17,568) 197,108 Corporate bonds 121,108 — (2,407) 118,701 Total debt securities 4,865,003 55 (468,137) 4,396,921 Equity securities with a readily determinable fair value 21,301 — — 21,301 Total $ 4,886,304 $ 55 $ (468,137) $ 4,418,222 December 31, 2023 U.S. treasuries $ 32,459 $ — $ (341) $ 32,118 U.S. agencies 14,724 — (194) 14,530 Obligations of states and political subdivisions 839,754 25 (98,534) 741,245 Mortgage-backed securities - agency 1,620,409 13 (226,793) 1,393,629 Mortgage-backed securities - non-agency 1,616,414 363 (87,649) 1,529,128 Commercial mortgage-backed securities - agency 76,076 — (11,288) 64,788 Commercial mortgage-backed securities - non-agency 526,974 — (12,116) 514,858 Asset-backed securities 232,140 — (14,770) 217,370 Corporate bonds 120,338 — (2,169) 118,169 Total debt securities 5,079,288 401 (453,854) 4,625,835 Equity securities with a readily determinable fair value 21,056 — — 21,056 Total $ 5,100,344 $ 401 $ (453,854) $ 4,646,891 The amortized cost, gross unrealized gains and losses and estimated fair values of held to maturity securities as of March 31, 2024, and December 31, 2023, are summarized in the table below, in thousands: Amortized Gross Gross Estimated March 31, 2024 Obligations of states and political subdivisions $ 841,055 $ 3,158 (30,461) $ 813,752 Total $ 841,055 $ 3,158 $ (30,461) $ 813,752 December 31, 2023 Obligations of states and political subdivisions $ 838,241 $ 3,622 $ (25,464) $ 816,399 Total $ 838,241 $ 3,622 $ (25,464) $ 816,399 As of March 31, 2024, and December 31, 2023, HTLF had $25.3 million and $28.0 million, respectively, of accrued interest receivable, which is included in other assets on the consolidated balance sheets. HTLF does not consider accrued interest receivable in the carrying amount of financial assets held at amortized cost basis or in the allowance for credit losses calculation. The amortized cost and estimated fair value of investment securities carried at fair value at March 31, 2024, by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. March 31, 2024 Amortized Cost Estimated Fair Value Due in 1 year or less $ 25,192 $ 25,066 Due in 1 to 5 years 62,702 61,628 Due in 5 to 10 years 21,452 19,054 Due after 10 years 895,157 786,558 Total debt securities 1,004,503 892,306 Mortgage and asset-backed securities 3,860,500 3,504,615 Equity securities with a readily determinable fair value 21,301 21,301 Total investment securities $ 4,886,304 $ 4,418,222 The amortized cost and estimated fair value of debt securities held to maturity at March 31, 2024, by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. March 31, 2024 Amortized Cost Estimated Fair Value Due in 1 year or less $ 8,147 $ 8,149 Due in 1 to 5 years 91,287 90,939 Due in 5 to 10 years 207,209 204,220 Due after 10 years 534,412 510,444 Total debt securities $ 841,055 $ 813,752 As of March 31, 2024, and December 31, 2023, securities with a carrying value of $2.61 billion and $2.63 billion, respectively, were pledged to secure public and trust deposits, short-term borrowings and for other purposes as required or permitted by law. Gross gains and losses realized related to the sales of securities carried at fair value for the three months ended March 31, 2024 and 2023, are summarized as follows, in thousands: Three Months Ended 2024 2023 Proceeds from sales $ — $ 146,448 Gross security gains — — Gross security losses — 1,104 The following table summarizes, in thousands, the amount of unrealized losses, defined as the amount by which cost or amortized cost exceeds fair value, and the related fair value of investments with unrealized losses in the securities portfolio as of March 31, 2024, and December 31, 2023. The investments were segregated into two categories: those that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or more. The reference point for determining how long an investment was in an unrealized loss position w as March 31, 2023, and December 31, 2023 , respectively. Debt securities available for sale Less than 12 months 12 months or longer Total Fair Unrealized Count Fair Unrealized Count Fair Unrealized Count March 31, 2024 U.S. treasuries $ 2,975 $ (20) 1 $ 29,247 $ (239) 4 $ 32,222 $ (259) 5 U.S. agencies — — — 13,892 (192) 4 13,892 (192) 4 Obligations of states and political subdivisions 1,689 (16) 3 721,778 (109,328) 148 723,467 (109,344) 151 Mortgage-backed securities - agency — — — 1,358,884 (231,254) 166 1,358,884 (231,254) 166 Mortgage-backed securities - non-agency 395,105 (22,829) 12 880,665 (62,396) 35 1,275,770 (85,225) 47 Commercial mortgage-backed securities - agency — — — 64,074 (11,708) 17 64,074 (11,708) 17 Commercial mortgage-backed securities - non-agency 7,735 (78) 1 418,359 (10,102) 16 426,094 (10,180) 17 Asset-backed securities 132,551 (12,303) 4 64,557 (5,265) 7 197,108 (17,568) 11 Corporate bonds 61,403 (510) 1 57,298 (1,897) 8 118,701 (2,407) 9 Total temporarily impaired securities $ 601,458 $ (35,756) 22 $ 3,608,754 $ (432,381) 405 $ 4,210,212 $ (468,137) 427 December 31, 2023 U.S. treasuries $ 2,985 $ (12) 1 $ 26,138 $ (329) 3 $ 29,123 $ (341) 4 U.S. agencies — — — 14,530 (194) 4 14,530 (194) 4 Obligations of states and political subdivisions 1,440 (65) 1 736,653 (98,469) 150 738,093 (98,534) 151 Mortgage-backed securities - agency 194 (2) 2 1,392,769 (226,791) 166 1,392,963 (226,793) 168 Mortgage-backed securities - non-agency 415,934 (24,568) 12 902,291 (63,081) 35 1,318,225 (87,649) 47 Commercial mortgage-backed securities - agency — — — 64,788 (11,288) 17 64,788 (11,288) 17 Commercial mortgage-backed securities - non-agency — — — 507,044 (12,116) 16 507,044 (12,116) 16 Asset-backed securities 148,063 (9,723) 4 69,307 (5,047) 7 217,370 (14,770) 11 Corporate bonds 61,031 (111) 1 57,138 (2,058) 8 118,169 (2,169) 9 Total temporarily impaired securities $ 629,647 $ (34,481) 21 $ 3,770,658 $ (419,373) 406 $ 4,400,305 $ (453,854) 427 Securities held to maturity Less than 12 months 12 months or longer Total Fair Unrealized Count Fair Unrealized Count Fair Unrealized Count March 31, 2024 Obligations of states and political subdivisions $ 51,881 $ (1,347) 13 $ 670,921 $ (29,114) 141 $ 722,802 $ (30,461) 154 Total temporarily impaired securities $ 51,881 (1,347) 13 $ 670,921 $ (29,114) 141 $ 722,802 (30,461) 154 December 31, 2023 Obligations of states and political subdivisions $ 145,471 $ (3,706) 23 $ 569,691 $ (21,758) 126 $ 715,162 $ (25,464) 149 Total temporarily impaired securities $ 145,471 $ (3,706) 23 $ 569,691 $ (21,758) 126 $ 715,162 $ (25,464) 149 HTLF reviews each security in the investment securities portfolio on a quarterly basis for potential credit losses, taking into consideration numerous factors, and the relative significance of any single factor can vary by security. Some factors HTLF may consider include changes in security ratings, financial condition of the issuer, and security and industry specific economic conditions. With regard to debt securities, HTLF may also evaluate payment structure, whether there are defaulted payments or expected defaults, prepayment speeds and the value of any underlying collateral. For certain debt securities in unrealized loss positions, HTLF prepares cash flow analyses to compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. The unrealized losses on HTLF's commercial mortgage, mortgage and asset-backed securities are the result of changes in market interest rates or widening of market spreads subsequent to HTLF's purchase of the securities. The losses are not related to concerns regarding the underlying credit of the issuers or the underlying collateral. It is expected that the securities will not be settled at a price less than the amortized cost of the investment. Because the decline in fair value is attributable to changes in interest rates or widening market spreads and not credit quality, and because, as of March 31, 2024, HTLF has the intent and ability to hold these investments until a market price recovery or to maturity and does not believe it will be required to sell the securities before maturity, no credit losses were recognized on these securities during the three months ended March 31, 2024 and 2023. The unrealized losses on HTLF's obligations of states and political subdivisions available for sale are the result of changes in market interest rates or widening of market spreads subsequent to the initial purchase of the securities. Management monitors the published credit ratings of these securities and the stability of the underlying municipalities. Because the declines in fair value are attributable to changes in interest rates or widening market spreads due to insurance company downgrades and not underlying credit quality, and because, as of March 31, 2024, HTLF has the intent and ability to hold these investments until a market price recovery or to maturity and does not believe it will be required to sell the securities before maturity, no credit losses were recognized on these securities during the three months ended March 31, 2024 and 2023. The following table summarizes, in thousands, the carrying amount of HTLF's held to maturity debt securities by investment rating as of March 31, 2024, and December 31, 2023, which are updated quarterly and used to monitor the credit quality of the securities: March 31, 2024 December 31, 2023 Rating AAA $ 88,849 $ 88,550 AA, AA+, AA- 575,331 583,816 A+, A, A- 150,409 139,658 BBB 20,111 20,133 Not Rated 6,355 6,084 Total $ 841,055 $ 838,241 Included in other investments were shares of stock in Federal Home Loan Bank (the "FHLB") at an amortized cost of $2.6 million at March 31, 2024, and $25.8 million at December 31, 2023. HTLF Bank is required by federal law to maintain FHLB stock as a member of the FHLB. These equity securities are "restricted" in that they can only be sold back to the respective institutions from which they were acquired or another member institution at par. Therefore, the FHLB stock is less liquid than other marketable equity securities, and the fair value approximates amortized cost. HTLF considers its FHLB stock as a long-term investment that provides access to competitive products and liquidity. HTLF evaluates impairment in these investments based on the ultimate recoverability of the par value and, at March 31, 2024, and December 31, 2023, did not consider the investments to be impaired.

LOANS

LOANS	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
LOANS	LOANS Loans as of March 31, 2024, and December 31, 2023, were as follows, in thousands: March 31, 2024 December 31, 2023 Loans receivable held to maturity: Commercial and industrial $ 3,545,051 $ 3,652,047 Paycheck Protection Program ("PPP") 2,172 2,777 Owner occupied commercial real estate 2,545,033 2,638,175 Non-owner occupied commercial real estate 2,495,068 2,553,711 Real estate construction 1,041,583 1,011,716 Agricultural and agricultural real estate 809,876 919,184 Residential real estate 756,021 797,829 Consumer 449,837 493,206 Total loans receivable held to maturity 11,644,641 12,068,645 Allowance for credit losses (123,934) (122,566) Loans receivable, net $ 11,520,707 $ 11,946,079 As of March 31, 2024, and December 31, 2023, HTLF had $66.4 million and $65.4 million, respectively, of accrued interest receivable, which is included in other assets on the consolidated balance sheets. HTLF does not consider accrued interest receivable in the allowance for credit losses calculation. The following table shows the balance in the allowance for credit losses at March 31, 2024, and December 31, 2023, and the related loan balances, disaggregated on the basis of measurement methodology, in thousands. If a loan no longer shares similar risk characteristics with other loans in the pool, it is evaluated on an individual basis and is not included in the collective evaluation. Lending relationships on nonaccrual with $500,000 or more of total exposure are individually assessed using a collateral dependency calculation. All other loans are collectively evaluated for losses. Allowance For Credit Losses Gross Loans Receivable Held to Maturity Individually Evaluated for Credit Losses Collectively Evaluated for Credit Losses Total Loans Individually Evaluated for Credit Losses Loans Collectively Evaluated for Credit Losses Total March 31, 2024 Commercial and industrial $ 20,555 $ 20,550 $ 41,105 $ 42,847 $ 3,502,204 $ 3,545,051 PPP — — — — 2,172 2,172 Owner occupied commercial real estate — 14,395 14,395 30,089 2,514,944 2,545,033 Non-owner occupied commercial real estate — 15,770 15,770 — 2,495,068 2,495,068 Real estate construction 56 34,869 34,925 697 1,040,886 1,041,583 Agricultural and agricultural real estate 2,479 2,629 5,108 7,143 802,733 809,876 Residential real estate — 5,155 5,155 727 755,294 756,021 Consumer — 7,476 7,476 — 449,837 449,837 Total $ 23,090 $ 100,844 $ 123,934 $ 81,503 $ 11,563,138 $ 11,644,641 December 31, 2023 Commercial and industrial $ 18,425 $ 22,254 $ 40,679 $ 41,847 $ 3,610,200 $ 3,652,047 PPP — — — — 2,777 2,777 Owner occupied commercial real estate — 17,156 17,156 30,400 2,607,775 2,638,175 Non-owner occupied commercial real estate — 17,249 17,249 — 2,553,711 2,553,711 Real estate construction 56 28,717 28,773 697 1,011,019 1,011,716 Agricultural and agricultural real estate 1,932 2,360 4,292 6,700 912,484 919,184 Residential real estate — 5,845 5,845 741 797,088 797,829 Consumer — 8,572 8,572 — 493,206 493,206 Total $ 20,413 $ 102,153 $ 122,566 $ 80,385 $ 11,988,260 $ 12,068,645 The following tables show the amortized cost basis as of March 31, 2024 and March 31, 2023, of the loans modified during the three months ended March 31, 2024 and March 31, 2023, to borrowers experiencing financial difficulty by loan category and type of concession granted, dollars in thousands. Loan Modifications Made to Borrowers Experiencing Financial Difficulty Term Extension Term Extension and Interest Only Payments For the Three Months Ended March 31, 2024 Amortized % of Loan Amortized % of Loan Commercial and industrial $ 267 0.01 % $ — — % Real estate construction 739 0.07 — — Total $ 1,006 0.01 % $ — — % Loan Modifications Made to Borrowers Experiencing Financial Difficulty Term Extension Term Extension and Interest Only Payments For the Three Months Ended March 31, 2023 Amortized % of Amortized % of Commercial $ 3,682 0.11 % $ — — % Owner occupied commercial real estate — — 5,043 0.22 Real estate construction 1,498 0.06 — — Residential real estate 762 0.01 — — Total $ 5,942 0.05 % $ 5,043 0.22 % The following tables describe the financial effect of the modifications made to borrowers experiencing financial difficulty in the three months ending March 31, 2024 and March 31, 2023. For the Three Months Ended March 31, 2024 Weighted Average Weighted Average Term Extension Commercial and industrial 6 0 Real estate construction 4 0 For the Three Months Ended March 31, 2023 Weighted Average Weighted Average Term Extension Commercial and industrial 10 0 Owner occupied commercial real estate 0 12 Real estate construction 6 0 Residential real estate 12 0 At March 31, 2024, there were no unfunded commitments to extend credit to the borrowers experiencing financial difficulty. HTLF had no loans to borrowers experiencing financial difficulty that had a payment default during the three months ended March 31, 2024, that had been modified in the twelve-month period prior to the default. HTLF closely monitors the performance of the loans that are modified to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following tables show the performance of loans that have been modified in the three months ended March 31, 2024 and March 31, 2023, dollars in thousands. Accruing Loans 30-59 60-89 90 Days or Total Past Due Current Nonaccrual March 31, 2024 Commercial and industrial $ — $ — $ — $ — $ 267 $ — Real estate construction — — — — 739 — Total $ — $ — $ — $ — $ 1,006 $ — Accruing Loans 30-59 60-89 90 Days or Total Past Due Current Nonaccrual March 31, 2023 Commercial and industrial $ — $ — $ — $ — $ 3,682 $ — Owner occupied commercial real estate — — — — 5,043 — Real estate construction — — — — — 1,498 Residential real estate — — — — — 762 Total $ — $ — $ — $ — $ 8,725 $ 2,260 HTLF's internal rating system is a series of grades reflecting management's credit risk assessment, based on its analysis of the borrower's financial condition. The "pass" category consists of all loans that are not in the "nonpass" category and consists of a range of loan grades that reflect increasing, though still acceptable, risk. Movement of risk through the various grade levels in the pass category is monitored for early identification of credit deterioration and risk rating migration analysis. The "nonpass" category consists of watch, substandard, doubtful and loss rated loans. The "watch" rating is attached to loans where the borrower exhibits negative trends in financial circumstances due to borrower specific or systemic conditions that, if left uncorrected, threaten the borrower's capacity to meet its debt obligations. The borrower is believed to have sufficient financial flexibility to react to and resolve its negative financial situation. These credits are closely monitored for improvement or deterioration. The "substandard" rating is assigned to loans that are inadequately protected by the current net worth and repaying capacity of the borrower and that may be further at risk due to deterioration in the value of collateral pledged. Well-defined weaknesses jeopardize liquidation of the debt. These loans are still considered collectible; however, a distinct possibility exists that HTLF will sustain some loss if deficiencies are not corrected. Substandard loans may exhibit some or all of the following weaknesses: deteriorating financial trends, insufficient earnings, inadequate debt service capacity, excessive debt and/or lack of liquidity. The "doubtful" rating is assigned to loans where identified weaknesses in the borrowers' ability to repay these loans make collection or liquidation in full, on the basis of existing facts, conditions and values, highly questionable and improbable. These borrowers are usually in default, lack liquidity, capital, and the resources necessary to remain as an operating entity. Specific pending events, such as capital injections, liquidations or perfection of liens on additional collateral, may strengthen the credit, thus deferring the rating of the loan as "loss" until the exact status of the loan can be determined. The "loss" rating is assigned to loans considered uncollectible. HTLF had no loans classified as "loss" or "doubtful" as of March 31, 2024, and December 31, 2023. The following table shows the risk category of loans by loan category, year of origination and charge-offs as of March 31, 2024, in thousands: As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total Commercial and industrial Pass $ 85,028 $ 592,529 $ 710,480 $ 286,818 $ 163,724 $ 374,702 $ 1,122,778 $ 3,336,059 Watch 13,514 20,205 16,882 12,357 1,657 3,862 31,468 99,945 Substandard 267 18,289 20,161 3,011 5,439 11,091 50,789 109,047 Commercial and industrial total $ 98,809 $ 631,023 $ 747,523 $ 302,186 $ 170,820 $ 389,655 $ 1,205,035 $ 3,545,051 Commercial and industrial charge-offs $ — $ 8 $ 766 $ 50 $ 511 $ 26 $ 936 $ 2,297 As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total PPP Pass $ — $ — $ — $ 1,877 $ 41 $ — $ — $ 1,918 Watch — — — 254 — — — 254 Substandard — — — — — — — — PPP total $ — $ — $ — $ 2,131 $ 41 $ — $ — $ 2,172 PPP charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Owner occupied commercial real estate Pass $ 83,691 $ 406,814 $ 532,653 $ 728,430 $ 209,476 $ 413,348 $ 43,734 $ 2,418,146 Watch — 3,924 30,954 8,071 3,802 12,888 — 59,639 Substandard — 23,469 13,465 2,256 20,279 7,779 — 67,248 Owner occupied commercial real estate total $ 83,691 $ 434,207 $ 577,072 $ 738,757 $ 233,557 $ 434,015 $ 43,734 $ 2,545,033 Owner occupied commercial real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Non-owner occupied commercial real estate Pass $ 14,376 $ 459,002 $ 661,486 $ 423,897 $ 184,310 $ 465,008 $ 16,824 $ 2,224,903 Watch 4,917 66,454 34,504 4,320 3,987 91,904 5,122 211,208 Substandard — 5,043 — 8,648 — 45,266 — 58,957 Non-owner occupied commercial real estate total $ 19,293 $ 530,499 $ 695,990 $ 436,865 $ 188,297 $ 602,178 $ 21,946 $ 2,495,068 Non-owner occupied commercial real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Real estate construction Pass $ 12,901 $ 308,707 $ 410,479 $ 121,769 $ 7,877 $ 11,397 $ 7,544 $ 880,674 Watch — 708 70,775 51,157 107 — — 122,747 Substandard — 9,006 28,989 — — 81 86 38,162 Real estate construction total $ 12,901 $ 318,421 $ 510,243 $ 172,926 $ 7,984 $ 11,478 $ 7,630 $ 1,041,583 Real estate construction charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Agricultural and agricultural real estate Pass $ 17,192 $ 121,110 $ 182,587 $ 103,742 $ 54,124 $ 62,884 $ 220,613 $ 762,252 Watch 340 3,738 1,546 744 723 49 2,444 9,584 Substandard — 160 22,825 1,506 4 12,698 847 38,040 Agricultural and agricultural real estate total $ 17,532 $ 125,008 $ 206,958 $ 105,992 $ 54,851 $ 75,631 $ 223,904 $ 809,876 Agricultural and agricultural real estate charge-offs $ — $ — $ — $ — $ — $ 167 $ 100 $ 267 Residential real estate Pass $ 13,804 $ 65,266 $ 167,944 $ 223,447 $ 70,074 $ 183,684 $ 17,444 $ 741,663 Watch 3 176 146 935 686 3,704 252 5,902 Substandard — 727 145 3,358 427 3,799 — 8,456 Residential real estate total $ 13,807 $ 66,169 $ 168,235 $ 227,740 $ 71,187 $ 191,187 $ 17,696 $ 756,021 Residential real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Consumer Pass $ 8,163 $ 40,081 $ 53,661 $ 31,283 $ 4,008 $ 7,704 $ 295,533 $ 440,433 Watch — 749 175 94 612 962 2,528 5,120 Substandard 191 91 202 403 1,117 1,331 949 4,284 Consumer total $ 8,354 $ 40,921 $ 54,038 $ 31,780 $ 5,737 $ 9,997 $ 299,010 $ 449,837 Consumer charge-offs $ — $ 30 $ 76 $ 44 $ 10 $ 29 $ 1,340 $ 1,529 As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total Total Pass $ 235,155 $ 1,993,509 $ 2,719,290 $ 1,921,263 $ 693,634 $ 1,518,727 $ 1,724,470 $ 10,806,048 Total Watch 18,774 95,954 154,982 77,932 11,574 113,369 41,814 514,399 Total Substandard 458 56,785 85,787 19,182 27,266 82,045 52,671 324,194 Total Loans $ 254,387 $ 2,146,248 $ 2,960,059 $ 2,018,377 $ 732,474 $ 1,714,141 $ 1,818,955 $ 11,644,641 Total charge-offs $ — $ 38 $ 842 $ 94 $ 521 $ 222 $ 2,376 $ 4,093 The following table shows the risk category of loans by loan category and year of origination as of December 31, 2023, in thousands. As of December 31, 2023 Amortized Cost Basis of Term Loans by Year of Origination 2023 2022 2021 2020 2019 2018 and Prior Revolving Total Commercial and industrial Pass $ 608,030 $ 779,218 $ 333,900 $ 187,406 $ 78,455 $ 327,775 $ 1,159,397 $ 3,474,181 Watch 20,694 19,788 257 3,631 2,398 2,953 28,749 78,470 Substandard 20,171 12,658 2,636 5,447 18,535 7,489 32,460 99,396 Commercial and industrial total $ 648,895 $ 811,664 $ 336,793 $ 196,484 $ 99,388 $ 338,217 $ 1,220,606 $ 3,652,047 Commercial and industrial charge-offs 245 794 680 1,425 563 1,949 2,966 8,622 PPP Pass $ — $ — $ 2,591 $ 50 $ — $ — $ — $ 2,641 Watch — — 89 — — — — 89 Substandard — — 47 — — — — 47 PPP total $ — $ — $ 2,727 $ 50 $ — $ — $ — $ 2,777 PPP charge-offs — — — — — — — — Owner occupied commercial real estate Pass $ 443,683 $ 547,898 $ 799,978 $ 225,257 $ 225,405 $ 224,608 $ 41,072 $ 2,507,901 Watch 8,052 25,947 13,114 2,662 8,115 7,553 — 65,443 Substandard 31,904 10,489 2,268 11,609 6,390 2,171 — 64,831 Owner occupied commercial real estate total $ 483,639 $ 584,334 $ 815,360 $ 239,528 $ 239,910 $ 234,332 $ 41,072 $ 2,638,175 Owner occupied commercial real estate charge-offs — 802 — 5 — 63 — 870 Non-owner occupied commercial real estate Pass $ 480,683 $ 656,824 $ 423,420 $ 203,330 $ 262,541 $ 251,499 $ 26,978 $ 2,305,275 Watch 71,400 34,651 8,237 3,834 27,345 57,083 — 202,550 Substandard 5,043 952 1,391 — 4,238 34,262 — 45,886 Non-owner occupied commercial real estate total $ 557,126 $ 692,427 $ 433,048 $ 207,164 $ 294,124 $ 342,844 $ 26,978 $ 2,553,711 Non-owner occupied commercial real estate charge-offs — 52 — 29 399 147 — 627 Real estate construction Pass $ 283,519 $ 468,646 $ 176,604 $ 9,889 $ 11,048 $ 3,405 $ 6,486 $ 959,597 Watch 629 33,220 9,418 72 — 65 — 43,404 Substandard — 8,522 — 107 — — 86 8,715 As of December 31, 2023 Amortized Cost Basis of Term Loans by Year of Origination 2023 2022 2021 2020 2019 2018 and Prior Revolving Total Real estate construction total $ 284,148 $ 510,388 $ 186,022 $ 10,068 $ 11,048 $ 3,470 $ 6,572 $ 1,011,716 Real estate construction charge-offs 284 — — 32 — — — 316 Agricultural and agricultural real estate Pass $ 152,665 $ 208,375 $ 114,798 $ 67,006 $ 28,247 $ 43,663 $ 260,941 $ 875,695 Watch 2,245 16,257 293 622 70 349 427 20,263 Substandard 12 7,616 1,649 4 855 12,591 499 23,226 Agricultural and agricultural real estate total $ 154,922 $ 232,248 $ 116,740 $ 67,632 $ 29,172 $ 56,603 $ 261,867 $ 919,184 Agricultural and agricultural real estate charge-offs — — — 9 — 1 5,309 5,319 Residential real estate Pass $ 71,470 $ 177,564 $ 241,362 $ 73,029 $ 42,526 $ 155,899 $ 19,534 $ 781,384 Watch 171 973 945 659 158 4,845 — 7,751 Substandard 741 150 3,400 464 290 3,649 — 8,694 Residential real estate total $ 72,382 $ 178,687 $ 245,707 $ 74,152 $ 42,974 $ 164,393 $ 19,534 $ 797,829 Residential real estate charge-offs — 59 124 — — — — 183 Consumer Pass $ 45,595 $ 62,900 $ 35,459 $ 7,731 $ 3,663 $ 6,109 $ 324,218 $ 485,675 Watch 730 84 694 21 41 644 2,060 4,274 Substandard 80 308 401 75 159 1,769 465 3,257 Consumer total $ 46,405 $ 63,292 $ 36,554 $ 7,827 $ 3,863 $ 8,522 $ 326,743 $ 493,206 Consumer charge-offs 2 246 154 27 19 112 3,117 3,677 Total Pass $ 2,085,645 $ 2,901,425 $ 2,128,112 $ 773,698 $ 651,885 $ 1,012,958 $ 1,838,626 $ 11,392,349 Total Watch 103,921 130,920 33,047 11,501 38,127 73,492 31,236 422,244 Total Substandard 57,951 40,695 11,792 17,706 30,467 61,931 33,510 254,052 Total Loans $ 2,247,517 $ 3,073,040 $ 2,172,951 $ 802,905 $ 720,479 $ 1,148,381 $ 1,903,372 $ 12,068,645 Total charge-offs $ 531 $ 1,953 $ 958 $ 1,527 $ 981 $ 2,272 $ 11,392 $ 19,614 Included in the nonpass loans at March 31, 2024, and December 31, 2023, were $254,000 and $136,000, respectively, of nonpass PPP loans as a result of risk ratings on non-PPP related credits. HTLF's risk rating methodology assigns a risk rating to the whole lending relationship. HTLF has no allowance recorded related to the PPP loans because of the 100% government guarantee through the United States Small Business Administration. Changes in credit risk are monitored on a continuous basis as part of relationship management, and changes in risk ratings are made when credit quality improves or deteriorates in accordance with HTLF's credit risk rating framework. All individually assessed loans are reviewed at least annually. As of March 31, 2024, HTLF had $189,000 of loans secured by residential real estate property that were in the process of foreclosure. The following table sets forth information regarding accruing and nonaccrual loans at March 31, 2024, and December 31, 2023, in thousands: Accruing Loans 30-59 60-89 90 Days or Total Current Nonaccrual Total Loans March 31, 2024 Commercial and industrial $ 6,540 $ 512 $ 437 $ 7,489 $ 3,490,499 $ 47,063 $ 3,545,051 PPP — — — — 2,172 — 2,172 Owner occupied commercial real estate 1,969 74 — 2,043 2,511,873 31,117 2,545,033 Non-owner occupied commercial real estate — — — — 2,495,068 — 2,495,068 Real estate construction 3,931 19,968 — 23,899 1,016,781 903 1,041,583 Agricultural and agricultural real estate 382 — 12 394 800,038 9,444 809,876 Residential real estate 818 53 103 974 750,166 4,881 756,021 Consumer 855 818 59 1,732 446,713 1,392 449,837 Total loans receivable held to maturity $ 14,495 $ 21,425 $ 611 $ 36,531 $ 11,513,310 $ 94,800 $ 11,644,641 December 31, 2023 Commercial and industrial $ 1,738 $ 126 $ 2,203 $ 4,067 $ 3,601,165 $ 46,815 $ 3,652,047 PPP 94 53 — 147 2,630 — 2,777 Owner occupied commercial real estate 205 2,664 74 2,943 2,603,640 31,592 2,638,175 Non-owner occupied commercial real estate 875 — — 875 2,552,469 367 2,553,711 Real estate construction 332 — — 332 1,010,601 783 1,011,716 Agricultural and agricultural real estate 121 — 12 133 909,841 9,210 919,184 Residential real estate 2,082 273 21 2,376 790,367 5,086 797,829 Consumer 2,257 150 197 2,604 489,029 1,573 493,206 Total loans receivable held to maturity $ 7,704 $ 3,266 $ 2,507 $ 13,477 $ 11,959,742 $ 95,426 $ 12,068,645 Loans delinquent 30 to 89 days as a percent of total loans were 0.31% at March 31, 2024, compared to 0.09% at December 31, 2023. HTLF recognized $0 of interest income on nonaccrual loans during the three months ended March 31, 2024 and March 31, 2023. As of March 31, 2024, and December 31, 2023, HTLF had $51.1 million and $52.5 million of nonaccrual loans with no related allowance, respectively.

ALLOWANCE FOR CREDIT LOSSES

ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2024
Loans and Leases Receivable Disclosure [Abstract]
ALLOWANCE FOR CREDIT LOSSES	ALLOWANCE FOR CREDIT LOSSES Changes in the allowance for credit losses on loans for the three months ended March 31, 2024, and March 31, 2023, were as follows, in thousands: Commercial Owner Occupied Commercial Non-Owner Occupied Commercial Real Estate Real Estate Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2023 $ 40,679 $ 17,156 $ 17,249 $ 28,773 $ 4,292 $ 5,845 $ 8,572 $ 122,566 Charge-offs (2,297) — — — (267) — (1,529) (4,093) Recoveries 562 — — — — 35 1,196 1,793 Provision (benefit) 2,161 (2,761) (1,479) 6,152 1,083 (725) (763) 3,668 Balance at March 31, 2024 $ 41,105 $ 14,395 $ 15,770 $ 34,925 $ 5,108 $ 5,155 $ 7,476 $ 123,934 Commercial Owner Occupied Commercial Non-Owner Occupied Commercial Real Estate Real Estate Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2022 $ 29,071 $ 13,948 $ 16,539 $ 29,998 $ 2,634 $ 7,711 $ 9,582 $ 109,483 Charge-offs (1,451) (14) — — — — (686) (2,151) Recoveries 1,722 112 — 17 10 19 1,311 3,191 Provision (benefit) 2,481 105 523 123 (98) (166) (784) 2,184 Balance at March 31, 2023 $ 31,823 $ 14,151 $ 17,062 $ 30,138 $ 2,546 $ 7,564 $ 9,423 $ 112,707 Management allocates the allowance for credit losses by pools of risk within each loan portfolio. The total allowance for credit losses is available to absorb losses from any segment of the loan portfolio. The provision expense in the three months ended March 31, 2024 was impacted by $2.0 million for the transfer of $352.7 million of Rocky Mountain Bank loans to the held for sale category. Changes in the allowance for credit losses for unfunded commitments for the three months ended March 31, 2024, and March 31, 2023, were as follows: For the Three Months Ended September 30, For the Three Months Ended March 31, 2024 2023 Balance at December 31, $ 16,468 $ 20,196 Provision (benefit) (2,682) 890 Balance at March 31, $ 13,786 $ 21,086

GOODWILL AND CORE DEPOSIT INTAN

GOODWILL AND CORE DEPOSIT INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND CORE DEPOSIT INTANGIBLE ASSETS	GOODWILL AND CORE DEPOSIT INTANGIBLE ASSETS HTLF had goodwill of $576.0 million at both March 31, 2024, and December 31, 2023. HTLF conducts an annual internal assessment of the goodwill both at the consolidated level and at the reporting unit level as of September 30, as well as when required due to triggering events related to the uncertainty of the value of the goodwill on HTLF's balance sheet. HTLF conducted its annual internal assessment of the goodwill at HTLF or HTLF's reporting units as of September 30. There was no goodwill impairment as of the most recent assessment. The gross carrying amount of other intangible assets consisted of core deposit intangibles and the associated accumulated amortization at March 31, 2024, and December 31, 2023, are presented in the table below, in thousands: March 31, 2024 December 31, 2023 Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 101,185 $ 84,262 $ 16,923 $ 101,185 $ 82,770 $ 18,415 Total $ 101,185 $ 84,262 $ 16,923 $ 101,185 $ 82,770 $ 18,415 The following table shows the estimated future amortization expense for amortizable intangible assets, in thousands: Core Deposit Intangibles Nine months ending December 31, 2024 $ 4,099 Year ending December 31, 2025 4,700 2026 3,533 2027 2,601 2028 1,287 2029 466 Thereafter 237 Total $ 16,923

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS HTLF uses derivative financial instruments as part of its interest rate risk management strategy, which may include interest rate swaps, fair value hedges, risk participation agreements, caps, floors, and collars. HTLF's current strategy includes the use of interest rate swaps as well as back-to-back loan swaps to assist customers in managing their interest rate risk while executing offsetting interest rate swaps with dealer counterparties. HTLF's objectives are to add stability to its net interest margin and to manage its exposure to movements in interest rates. The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amounts to be exchanged between the counterparties. HTLF is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. HTLF minimizes this risk by entering into derivative contracts with counterparties that meet HTLF’s credit standards, and the contracts contain collateral provisions protecting the at-risk party. HTLF has not experienced any losses from nonperformance by these counterparties. HTLF monitors counterparty risk in accordance with the provisions of ASC 815. HTLF was required to post $590,000 of collateral at March 31, 2024, compared to $27.7 million as of December 31, 2023, related to derivative financial instruments. HTLF's counterparties were required to pledge $93.6 million at March 31, 2024, compared to $44.8 million at December 31, 2023. HTLF's derivative and hedging instruments are recorded at fair value on the consolidated balance sheets. See Note 7, "Fair Value," for additional fair value information and disclosures. Cash Flow Hedges In 2021, one interest rate swap terminated, and the debt was converted to variable rate subordinated debentures. HTLF recognized all remaining cash payments related to the terminated derivatives in the first quarter of 2024 and reclassified the remaining cash payments from accumulated other comprehensive income (loss) to interest expense. In the first quarter of 2023, HTLF terminated its interest rate swap agreement, which effectively converted $500.0 million of variable rate loans to fixed rate loans. For the next twelve months, HTLF estimates cash payments and reclassification from accumulated other comprehensive income (loss) to interest income will total $982,000. HTLF had no derivative instruments designated as cash flow hedges at March 31, 2024. The table below identifies the gains and losses recognized on HTLF's terminated derivative instruments designated as cash flow hedges for the three months ended March 31, 2024, and March 31, 2023, in thousands: Recognized in OCI Reclassified from AOCI into Income Amount of Gain (Loss) Category Amount of Gain (Loss) Three Months Ended March 31, 2024 Interest rate swap $ — Interest income $ (35) Three Months Ended March 31, 2023 Interest rate swap $ 1,952 Interest income $ 591 Fair Value Hedges HTLF uses interest rate swaps to convert certain long term fixed rate loans to floating rates to hedge interest rate risk exposure. HTLF also uses interest rate swaps to mitigate the risk of changes in the fair market value of certain municipal and mortgage-backed securities. The changes in the fair values of derivatives that have been designated and qualify for fair value hedge accounting are recorded in the same line item in the consolidated statements of income as the changes in the fair value of the hedged items attributable to the risk being hedged. HTLF uses statistical regression to assess hedge effectiveness, both at the inception of the hedge as well as on a continual basis. The regression analysis involves regressing the periodic change in the fair value of the hedging instrument against the periodic changes in the fair value of the asset being hedged due to changes in the hedge risk. During 2023, HTLF entered into interest rate swaps designated as fair value hedges with initial notional amounts totaling $838.1 million primarily designed to provide protection for unrealized securities losses against the impact of higher mid-to-long term interest rates. HTLF also executed interest rate swaps designated as a fair value hedges with total original notional amounts of $2.5 billion to convert certain long-term fixed rate loans to floating rates to hedge interest rate risk exposure using the portfolio layer method, which allows HTLF to designate as the hedged item a stated amount of the assets that are not expected to be affected by prepayments, defaults and other factors that would affect the timing and amount of cash flow. The table below identifies the fair value of the interest rate swaps designated as fair value hedges and the balance sheet category of the interest rate swaps as of March 31, 2024 and December 31, 2023, in thousands: Fair Value Balance Sheet Category March 31, 2024 Interest rate swaps-loans receivable held to maturity $ 13,901 Other assets Interest rate swaps-securities carried at fair value 42,972 Other assets Interest rate swaps-loans receivable held to maturity 5,946 Other liabilities December 31, 2023 Interest rate swaps-loans receivable held to maturity $ 5,027 Other assets Interest rate swaps-securities carried at fair value 23,182 Other assets Interest rate swaps-loans receivable held to maturity 27,554 Other liabilities The table below identifies the carrying amount of the hedged assets and cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets that are designated as fair value hedge accounting relationships at March 31, 2024, and December 31, 2023, in thousands: Location in the consolidated Carrying Amount of Cumulative Amount of Fair Value March 31, 2024 Interest rate swap Loans receivable held to maturity $ 2,494,674 $ (5,885) Interest rate swap Securities carried at fair value 756,035 (40,827) December 31, 2023 Interest rate swap Loans receivable held to maturity $ 2,525,261 $ 24,652 Interest rate swap Securities carried at fair value $ 786,716 $ (20,979) The table below identifies the net impact to interest income recognized on HTLF's fair value hedges specific to the fair value remeasurements and the income statement classification where it is recorded in comparison to the total amount of interest income presented on the consolidated statements of income for the three months ended March 31, 2024, and March 31, 2023, in thousands: Three Months Ended 2024 2023 Gain (loss) recognized in interest income and fees on loans $ 8 $ 1 Total amount of interest and fees on loans 195,661 153,843 Gain (loss) recognized in interest income on securities-taxable (303) — Total amount of interest on securities-taxable 47,014 55,976 The table below identifies the effect of fair value hedge accounting on the consolidated statements of income, in thousands: Three Months Ended 2024 2023 Hedged item (loans receivable held to maturity) $ (30,529) $ 16 Hedged item (securities carried at fair value) (20,151) — Derivatives designated as hedging instruments on loans receivable held to maturity 30,537 (15) Derivatives designated as hedging instruments on securities carried at fair value 19,848 — Embedded Derivatives HTLF has fixed rate loans with embedded derivatives. These loans contain terms that affect the cash flows or value of the loan similar to a derivative instrument, and therefore are considered to contain an embedded derivative. The embedded derivatives are bifurcated from the loans because the terms of the derivative instrument are not clearly and closely related to the loans. The embedded derivatives are recorded at fair value on the consolidated balance sheets as a part of other assets, and changes in the fair value are a component of noninterest income. The table below identifies the notional amount, fair value and balance sheet category of the embedded derivatives at March 31, 2024, and December 31, 2023, in thousands: Notional Amount Fair Value Balance Sheet Category March 31, 2024 Embedded derivatives $ 2,344 $ 70 Other assets December 31, 2023 Embedded derivatives $ 2,391 $ 61 Other assets The table below identifies the gains and losses recognized on HTLF's embedded derivatives for the three months ended March 31, 2024, and March 31, 2023, in thousands: Three Months Ended 2024 2023 Gain (loss) recognized in other noninterest income on embedded derivatives $ 9 $ (37) Back-to-Back Loan Swaps HTLF has loan interest rate swap relationships with customers to assist them in managing their interest rate risk. Upon entering into these loan swaps, HTLF enters into offsetting positions with counterparties in order to minimize interest rate risk to HTLF. These back-to-back loan swaps qualify as free standing financial derivatives with the fair values reported in other assets and other liabilities on the consolidated balance sheets. Any gains and losses on these back-to-back swaps are recorded in noninterest income on the consolidated statements of income, and for the three months ended March 31, 2024, and March 31, 2023, no gain or loss was recognized. HTLF recognized $891,000 in fee income related to executing back-to-back loan swaps for customers for the three months ended March 31, 2024, compared to $2.0 million and for the three months ended March 31, 2023. The table below identifies the balance sheet category and fair values of the derivative instruments designated as loan swaps at March 31, 2024, and December 31, 2023, in thousands: Notional Fair Balance Sheet March 31, 2024 Customer interest rate swaps $ 1,744,314 $ 63,517 Other assets Customer interest rate swaps 1,744,314 (63,517) Other liabilities December 31, 2023 Customer interest rate swaps $ 1,672,729 $ 56,634 Other assets Customer interest rate swaps 1,672,729 (56,634) Other liabilities Other Free Standing Derivatives HTLF acquired undesignated interest rate swaps in 2015. These swaps were entered into primarily for the benefit of customers seeking to manage their interest rate risk and are not designated against specific assets or liabilities on the consolidated balance sheets or forecasted transactions and therefore do not qualify for hedge accounting in accordance with ASC 815. These swaps are carried at fair value on the consolidated balance sheets as a component of other liabilities, with changes in the fair value recorded as a component of other noninterest income. The table below identifies the balance sheet category and fair values of HTLF's other free standing derivative instruments not designated as hedging instruments at March 31, 2024, and December 31, 2023, in thousands: Notional Amount Fair Value Balance Sheet Category March 31, 2024 Undesignated interest rate swaps 2,344 (70) Other liabilities December 31, 2023 Undesignated interest rate swaps 2,391 (61) Other liabilities HTLF recognizes gains and losses on other free standing derivatives in two separate income statement categories. Interest rate lock commitments and forward commitments are recognized in net gains on sale of loans held for sale and undesignated interest rate swaps are recognized in other noninterest income. As of the balance sheet dates presented above there were no interest rate lock commitments or forward commitments. The table below identifies the gains and losses recognized in income on HTLF's other free standing derivative instruments not designated as hedging instruments for the three months ended March 31, 2024, and March 31, 2023, in thousands: Three Months Ended 2024 2023 Interest rate lock commitments (mortgage) $ — $ 410 Forward commitments — 272 Undesignated interest rate swaps 9 37

FAIR VALUE

FAIR VALUE	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE	FAIR VALUE HTLF utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Securities carried at fair value, which include available for sale, trading securities and equity securities with a readily determinable fair value, and derivatives are recorded in the consolidated balance sheets at fair value on a recurring basis. Additionally, from time to time, HTLF may be required to record at fair value other assets on a nonrecurring basis such as loans held for sale, loans held to maturity and certain other assets including, but not limited to, commercial servicing rights and other real estate owned. These nonrecurring fair value adjustments typically involve application of the lower of cost or fair value accounting or write-downs of individual assets. Fair Value Hierarchy Under ASC 820, assets and liabilities are grouped at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1 — Valuation is based upon quoted prices for identical instruments in active markets. Level 2 — Valuation is based upon quoted prices for similar instruments in active markets, or similar instruments in markets that are not active, and model-based valuation techniques for all significant assumptions are observable in the market. Level 3 — Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. The following is a description of valuation methodologies used for assets and liabilities recorded at fair value on a recurring or non-recurring basis. Securities Available for Sale and Held to Maturity Securities available for sale are recorded at fair value on a recurring basis. Securities held to maturity are generally recorded at cost. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security's credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, as well as U.S. Treasury securities. Level 2 securities include U.S. government and agency securities, mortgage and asset-backed securities and private collateralized mortgage obligations, municipal bonds and corporate debt securities. On a quarterly basis, a secondary independent pricing service is used for the securities portfolio to validate the pricing from HTLF's primary pricing service. Equity Securities with a Readily Determinable Fair Value Equity securities with a readily determinable fair value generally include Community Reinvestment Act mutual funds and are classified as Level 2 due to the infrequent trading of these securities. The fair value is based on the price per share. Loans Held for Sale Loans held for sale are carried at the lower of cost or fair value on an aggregate basis. The fair value of loans held for sale is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, HTLF classifies loans held for sale subjected to nonrecurring fair value adjustments as Level 2. As of March 31, 2024, loans held for sale includes $352.7 million related to the Rocky Mountain Bank division. HTLF Bank signed definitive agreements in February of 2024 to sell all nine Rocky Mountain Bank branches in Montana. Loans Held to Maturity HTLF does not record loans held to maturity at fair value on a recurring basis. However, from time to time, certain loans are considered collateral dependent and an allowance for credit losses is established. The fair value of individually assessed loans is measured using the fair value of the collateral. In accordance with ASC 820, individually assessed loans measured at fair value are classified as nonrecurring Level 3 in the fair value hierarchy. Premises, Furniture and Equipment Held for Sale HTLF considers third party appraisals less estimated disposal costs, as well as independent fair value assessments from realtors or persons involved in selling bank premises, furniture and equipment, in determining the fair value of particular properties held for sale. Accordingly, the valuation of premises, furniture and equipment held for sale is subject to significant external and internal judgment. HTLF periodically reviews premises, furniture and equipment held for sale to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. Premises, furniture and equipment held for sale are classified as nonrecurring Level 3 in the fair value hierarchy. As of March 31, 2024, premises, furniture and equipment held for sale includes $13.2 million related to the Rocky Mountain Bank division. HTLF Bank signed definitive agreements in February of 2024 to sell all nine Rocky Mountain Bank branches in Montana. The properties will transfer upon completion of the sales transactions. Derivative Financial Instruments HTLF's current interest rate risk strategy includes cash flow hedges and interest rate swaps. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. To comply with the provisions of ASC 820, HTLF incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, HTLF has considered the impact of netting any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although HTLF has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2024, and December 31, 2023, HTLF has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, HTLF has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. Other Real Estate Owned Other real estate owned ("OREO") represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the fair value of the property at the time of acquisition (representing the property's cost basis), plus any acquisition costs, or the estimated fair value of the property, less disposal costs. HTLF considers third party appraisals, as well as independent fair value assessments from realtors or persons involved in selling OREO, in determining the fair value of particular properties. Accordingly, the valuation of OREO is subject to significant external and internal judgment. HTLF periodically reviews OREO to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. OREO is classified as nonrecurring Level 3 of the fair value hierarchy. The table below presents HTLF's assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2024, and December 31, 2023, in thousands, aggregated by the level in the fair value hierarchy within which those measurements fall: Total Fair Value Level 1 Level 2 Level 3 March 31, 2024 Assets Securities available for sale U.S. treasuries $ 32,222 $ 32,222 $ — $ — U.S. agencies 13,892 — 13,892 — Obligations of states and political subdivisions 727,491 — 727,491 — Mortgage-backed securities - agency 1,359,541 — 1,359,541 — Mortgage-backed securities - non-agency 1,457,798 — 1,457,798 — Commercial mortgage-backed securities - agency 64,074 — 64,074 — Commercial mortgage-backed securities - non-agency 426,094 — 426,094 — Asset-backed securities 197,108 — 197,108 — Corporate bonds 118,701 — 118,701 — Equity securities with a readily determinable fair value 21,301 — 21,301 — Derivative financial instruments (1) 120,460 — 120,460 — Total assets at fair value $ 4,538,682 $ 32,222 $ 4,506,460 $ — Liabilities Derivative financial instruments (2) $ 69,533 $ — $ 69,533 $ — Total liabilities at fair value $ 69,533 $ — $ 69,533 $ — December 31, 2023 Assets Securities available for sale U.S. treasuries $ 32,118 $ 32,118 $ — $ — U.S. agencies 14,530 — 14,530 — Obligations of states and political subdivisions 741,245 — 741,245 — Mortgage-backed securities - agency 1,393,629 — 1,393,629 — Mortgage-backed securities - non-agency 1,529,128 — 1,529,128 — Commercial mortgage-backed securities - agency 64,788 — 64,788 — Commercial mortgage-backed securities - non-agency 514,858 — 514,858 — Asset-backed securities 217,370 — 217,370 — Corporate bonds 118,169 — 118,169 — Equity securities with a readily determinable fair value 21,056 — 21,056 — Derivative financial instruments (1) 84,904 — 84,904 — Total assets at fair value $ 4,731,795 $ 32,118 $ 4,699,677 $ — Liabilities Derivative financial instruments (2) $ 84,249 $ — $ 84,249 $ — Total liabilities at fair value $ 84,249 $ — $ 84,249 $ — (1) Includes interest rate swaps, fair value hedges, embedded derivatives and back-to-back loan swaps. (2) Includes fair value hedges, back-to-back loan swaps and free standing derivatives. The tables below present HTLF's assets that are measured at fair value on a nonrecurring basis as of March 31, 2024, and December 31, 2023, in thousands: Fair Value Measurements at March 31, 2024 Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 22,292 $ — $ — $ 22,292 $ — Owner occupied commercial real estate 30,089 — — 30,089 — Non-owner occupied commercial real estate — — — — — Real estate construction 642 — — 642 — Agricultural and agricultural real estate 4,664 — — 4,664 — Residential real estate 727 — — 727 — Total collateral dependent individually assessed loans $ 58,414 $ — $ — $ 58,414 $ — Loans held for sale $ 352,744 $ — $ 352,744 $ — $ — Other real estate owned 2,590 — — 2,590 539 Premises, furniture and equipment held for sale 16,064 — — 16,064 7 Fair Value Measurements at December 31, 2023 Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 23,422 $ — $ — $ 23,422 $ 554 Owner occupied commercial real estate 30,400 — — 30,400 — Non-owner occupied commercial real estate — — — — — Real estate construction 642 — — 642 — Agricultural and agricultural real estate 4,768 — — 4,768 5,309 Residential real estate 741 — — 741 — Total collateral dependent individually assessed loans $ 59,973 $ — $ — $ 59,973 $ 5,863 Loans held for sale $ 5,071 $ — $ 5,071 $ — $ — Other real estate owned 12,548 — — 12,548 2,967 Premises, furniture and equipment held for sale 4,069 — — 4,069 2,786 The following tables present additional quantitative information about assets measured at fair value on a recurring and nonrecurring basis and for which HTLF has utilized Level 3 inputs to determine fair value, in thousands: Fair Value at Valuation Unobservable Range (Weighted Other real estate owned 2,590 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Premises, furniture and equipment held for sale 16,064 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Collateral dependent individually assessed loans: Commercial 22,292 Modified appraised value Third party appraisal (1) Appraisal discount 0-12% (2) Owner occupied commercial real estate 30,089 Modified appraised value Third party appraisal (1) Appraisal discount 0-20% (2) Non-owner occupied commercial real estate — Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Real estate construction 642 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Agricultural and agricultural real estate 4,664 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Residential real estate 727 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) (1) Third party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (2) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral. Fair Value at 12/31/2023 Valuation Unobservable Range (Weighted Average) Other real estate owned 2,590 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Premises, furniture and equipment held for sale 16,064 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Collateral dependent individually assessed loans: Commercial and industrial 23,422 Modified appraised value Third party appraisal (1) Appraisal discount 0-12% (2) Owner occupied commercial real estate 30,400 Modified appraised value Third party appraisal (1) Appraisal discount 0-20% (2) Non-owner occupied commercial real estate — Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Real estate construction 642 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Agricultural and agricultural real estate 4,768 Modified appraised value Third party appraisal (1) Appraisal discount 0-15% (2) Residential real estate 741 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) (1) Third-party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (2) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral. The table below is a summary of the estimated fair value of HTLF's financial instruments (as defined by ASC 825) as of March 31, 2024, and December 31, 2023, in thousands. The carrying amounts in the following tables are recorded in the consolidated balance sheets under the indicated captions. In accordance with ASC 825, the assets and liabilities that are not financial instruments are not included in the disclosure, including the value of premises, furniture and equipment, premises, furniture and equipment held for sale, OREO, goodwill, and other intangibles and other liabilities. HTLF does not believe that the estimated information presented herein is representative of the earnings power or value of HTLF. The following analysis, which is inherently limited in depicting fair value, also does not consider any value associated with either existing customer relationships or the ability of HTLF to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different. Fair Value Measurements at March 31, 2024 Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 444,366 $ 444,366 $ 444,366 $ — $ — Time deposits in other financial institutions 1,240 1,240 1,240 — — Securities: Carried at fair value 4,418,222 4,418,222 32,222 4,386,000 — Held to maturity 841,055 813,752 — 813,752 — Other investments 68,524 68,524 — 68,524 — Loans held for sale 352,744 352,744 — 352,744 — Loans, net: Commercial and industrial 3,503,946 3,301,416 — 3,279,124 22,292 PPP 2,172 2,172 — 2,172 — Owner occupied commercial real estate 2,530,638 2,356,849 — 2,326,760 30,089 Non-owner occupied commercial real estate 2,479,298 2,350,454 — 2,350,454 — Real estate construction 1,006,658 1,002,602 — 1,001,960 642 Agricultural and agricultural real estate 804,768 734,698 — 730,034 4,664 Residential real estate 750,866 654,298 — 653,571 727 Consumer 442,361 424,618 — 424,618 — Total Loans, net 11,520,707 10,827,107 — 10,768,693 58,414 Cash surrender value on life insurance 197,671 197,671 — 197,671 — Derivative financial instruments (1) 120,460 120,460 — 120,460 — Financial liabilities: Deposits Demand deposits 4,264,390 4,264,390 — 4,264,390 — Savings deposits 8,669,221 8,669,221 — 8,669,221 — Time deposits 2,368,555 2,368,555 — 2,368,555 — Deposits held for sale 596,328 631,274 — 631,274 — Borrowings 650,033 650,033 — 650,033 — Term Debt 372,652 374,240 — 374,240 — Derivative financial instruments (2) 69,533 69,533 — 69,533 — (1) Includes interest rate swaps, fair value hedges, embedded derivatives and back-to-back loan swaps. (2) Includes fair value hedges, back-to-back loan swaps and undesignated interest rate swaps. Fair Value Measurements at Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 323,013 $ 323,013 $ 323,013 $ — $ — Time deposits in other financial institutions 1,240 1,240 1,240 — — Securities: Carried at fair value 4,646,891 4,646,891 32,118 4,614,773 — Held to maturity 838,241 816,399 — 816,399 — Other investments 91,277 91,277 — 91,277 — Loans held for sale 5,071 5,071 — 5,071 — Loans, net: Commercial and industrial 3,611,368 3,396,628 — 3,373,206 23,422 PPP 2,777 2,777 — 2,777 — Owner occupied commercial real estate 2,621,019 2,444,540 — 2,414,140 30,400 Non-owner occupied commercial real estate 2,536,462 2,393,931 — 2,393,931 — Real estate construction 982,943 979,105 — 978,463 642 Agricultural and agricultural real estate 914,892 839,572 — 834,804 4,768 Residential real estate 791,984 687,428 — 686,687 741 Consumer 484,634 465,686 — 465,686 — Total Loans, net 11,946,079 11,209,667 — 11,149,694 59,973 Cash surrender value on life insurance 197,085 197,085 — 197,085 — Derivative financial instruments (1) 84,904 84,904 — 84,904 — Financial liabilities: Deposits Demand deposits 4,500,304 4,500,304 — 4,500,304 — Savings deposits 8,805,597 8,805,597 — 8,805,597 — Time deposits 2,895,813 2,895,813 — 2,895,813 — Borrowings 622,255 622,255 — 622,255 — Term Debt 372,396 374,017 — 374,017 — Derivative financial instruments (2) 84,249 84,249 — 84,249 — (1) Includes interest rate swaps, fair value hedges, embedded derivatives and back-to-back loan swaps. (2) Includes fair value hedges, back-to-back loan swaps and undesignated interest rate swaps. Cash and Cash Equivalents — The carrying amount is a reasonable estimate of fair value due to the short-term nature of these instruments. Time Deposits in Other Financial Institutions — The carrying amount is a reasonable estimate of fair value due to the short-term nature of these instruments. Securities — For equity securities with a readily determinable fair value and debt securities either held to maturity, available for sale or trading, fair value equals quoted market price if available. If a quoted market price is not available, fair value is estimated using quoted market prices for similar securities. For Level 3 securities, HTLF utilizes independent pricing provided by third party vendors or brokers. Other Investments — Fair value measurement of other investments, which consists primarily of FHLB stock, are based on their redeemable value, which is at cost due to the restrictions placed on their transferability. The market for these securities is restricted to the issuer of the stock and subject to impairment evaluation. Loans — The fair value of loans is determined using an exit price methodology. The exit price estimation of fair value is based on the present value of the expected cash flows. The projected cash flows are based on the contractual terms of the loans, adjusted for prepayments and a discount rate based on the relative risk of the cash flows. Other considerations include the loan type, remaining life of the loan and credit risk. The fair value of individually assessed or impaired loans is measured using the fair value of the underlying collateral. The fair value of loans held for sale is estimated using quoted market prices. Cash surrender value on life insurance — Life insurance policies are held on certain officers. The carrying value of these policies approximates fair value as it is based on the cash surrender value adjusted for other charges or amounts due that are probable at settlement. As such, HTLF classifies the estimated fair value of the cash surrender value on life insurance as Level 2. Derivative Financial Instruments — The fair value of all derivatives is estimated based on the amount that HTLF would pay or would be paid to terminate the contract or agreement, using current rates and prices, and, when appropriate, the current creditworthiness of the counterparty. Deposits — The fair value of demand deposits, savings accounts and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. If the fair value of the fixed maturity certificates of deposit is calculated at less than the carrying amount, the carrying value of these deposits is reported as the fair value. Borrowings and Term Debt — Rates currently available to HTLF for debt with similar terms and remaining maturities are used to estimate fair value of existing debt. Commitments to Extend Credit, Unused Lines of Credit and Standby Letters of Credit — Based upon management's analysis of the off balance sheet financial instruments, there are no significant unrealized gains or losses associated with these financial instruments based upon review of the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties.

STOCK COMPENSATION

STOCK COMPENSATION	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
STOCK COMPENSATION	STOCK COMPENSATION Under its 2020 Long-Term Incentive Plan (the "Plan"), HTLF's Compensation and Human Capital Committee, (the "Compensation Committee"), may grant non-qualified and incentive stock options, stock appreciation rights, stock awards, restricted stock, restricted stock units and cash incentive awards. The Plan authorized 1,460,000 shares of common stock for issuance, of which 474,721 shares of common stock were available as of March 31, 2024, for issuance of future awards to employees and directors of, and service providers to, HTLF or its subsidiaries. The cost of each award is based upon its fair value estimated on the date of grant and recognized in the consolidated statements of income over the vesting period of the award. The fair market value of restricted stock and restricted stock units is based on the fair value of the underlying shares of common stock on the date of grant. Forfeitures are accounted for as they occur. HTLF's income tax expense included $418,000 of tax expense during the three months ended March 31, 2024, and a tax benefit of $46,000 during the three months ended March 31, 2023, related to the exercise, vesting and forfeiture of equity-based awards. Restricted Stock Units The Plan permits the Compensation Committee to grant restricted stock units ("RSUs"). The time-based RSUs are generally granted in the first quarter of each year and represent the right, without payment, to receive shares of HTLF common stock on a specified date in the future. Generally, the time-based RSUs vest over three years in equal installments in March of each of the three years following the year of the grant. The Compensation Committee has also granted three-year performance-based RSUs, generally in the first quarter of each year. These performance-based RSUs will be earned based on satisfaction of performance targets for the three-year performance period as defined in the RSU agreement. These performance-based RSUs or a portion thereof vest after measurement of performance in relation to the performance targets. The time-based RSUs also vest upon death, disability, a "qualified retirement" (as defined in the RSU agreement), or upon certain terminations of employment following a change in control, and the three-year performance-based RSUs may also vest to the extent that they are earned upon those same conditions. All of HTLF's RSUs will be settled in common stock upon vesting. Most RSUs granted after March 2023 accrue dividend equivalents, which are paid in cash without interest only upon vesting. Dividend equivalents with respect to RSUs forfeited are also forfeited. RSUs granted prior to March 2023 are not entitled to dividend equivalents. A summary of the RSUs outstanding as of March 31, 2024, and March 31, 2023, and changes during the three months ended March 31, 2024 and 2023, follows: 2024 2023 Shares Weighted-Average Grant Date Shares Weighted-Average Grant Date Outstanding at January 1, 466,105 $ 47.22 424,086 $ 46.15 Granted 307,374 33.09 198,562 50.75 Vested (130,524) 50.28 (125,870) 42.15 Forfeited (32,624) 51.68 (21,338) 42.40 Outstanding at March 31, 610,331 $ 39.21 475,440 $ 49.30 Total compensation costs recorded for RSUs were $3.6 million and $4.3 million during the three months ended March 31, 2024 and 2023, respectively. As of March 31, 2024, there were $14.6 million of total unrecognized compensation costs related to the Plan for RSUs that are expected to be recognized through 2027. Stock Options The Plan provides the Compensation Committee the authority to grant stock options. During the year ended December 31, 2022, 64,518 options were granted, and the fair value of the options granted was determined using the Black-Scholes valuation model. The options granted generally vest over the first four years in equal installments on the anniversary date of the grant. The options may also vest upon death, disability, upon a change in control or upon a "qualified retirement" as defined in the stock option agreement. The exercise price of the stock options was established by the Compensation Committee, but the exercise price may not be less than the fair market value of the shares on the date the options are granted. A summary of the status of stock options as of March 31, 2024, and March 31, 2023, and changes during the three months ended March 31, 2024 and 2023, follows: 2024 2023 Shares Weighted Average Shares Weighted Average Outstanding January 1, 58,066 $ 48.79 64,518 $ 48.79 Granted — — — — Exercised — — — — Forfeited (5,161) 48.79 (3,226) 48.79 Outstanding at March 31, 52,905 48.79 61,292 48.79 Options exercisable at March 31, 13,224 $ 48.79 — $ —

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The interim unaudited consolidated financial statements contained herein should be read in conjunction with the audited consolidated financial statements and accompanying notes to the consolidated financial statements for the fiscal year ended December 31, 2023, included in the Annual Report on Form 10-K of Heartland Financial USA, Inc. ("HTLF") filed with the Securities and Exchange Commission ("SEC") on February 23, 2024 . Foot note disclosures to the interim unaudited consolidated financial statements which would substantially duplicate the disclosure contained in the footnotes to the audited consolidated financial statements have been omitted. The financial information included herein has been prepared in accordance with U.S. generally accepted accounting principles for interim financial reporting and has been prepared pursuant to the rules and regulations for reporting on Form 10-Q and Rule 10-01 of Regulation S-X. Such information reflects all adjustments (consisting of normal recurring adjustments), that are, in the opinion of management, necessary for a fair presentation of the financial position and results of operations for the periods presented. The results of the interim period ended March 31, 2024, are not necessarily indicative of the results expected for the year ending December 31, 2024.
Earnings Per Share	Basic earnings per share is determined using net income available to common stockholders and weighted average common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted average common shares and assumed incremental common shares issued.
Subsequent Events	HTLF has evaluated subsequent events that may require recognition or disclosure through the filing date of this Quarterly Report on Form 10-Q with the SEC and has concluded there are no other subsequent events that would require recognition in the accompanying consolidated financial statements.
Effect of New Financial Accounting Standards	ASU 2023-02 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 (a consensus of the Emerging Issues Task Force)." ASU 2023-02 expands the permitted use of the proportional amortization method, which is currently only available to low-income housing tax credit investments, to other tax equity investments if certain conditions are met. Under the proportional amortization method, the initial cost of an investment is amortized in proportion to the income tax benefits received and both the amortization of the investment and the income tax benefits received are recognized as a component of income tax expense. This ASU was effective on January 1, 2024. HTLF has elected to use the proportional amortization method for investments in low-income housing projects. The amendments in this ASU are not expected to have a material impact on the results of operations or financial position. ASU 2023-06 In October 2023, the FASB issued ASU 2023-06, "Disclosure Improvements: Codification Amendments in Response to the SEC's Disclosure Update and Simplification Initiative." The amendments in this Update modify the disclosure or presentation requirements of a variety of Topics in the Codification. Certain of the amendments represent clarifications to, or technical corrections of, the current requirements. Each amendment in the ASU will only become effective if the SEC removes the related disclosure or presentation requirement from its existing regulations by June 30, 2027. The amendments in this ASU are not expected to have a material impact on the results of operations or financial position. ASU 2023-07 In November 2023, the FASB issued ASU 2023-07, " Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures" to improve disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This update does not change how a public entity identifies its operating segments; however, it does require that an entity that has single reportable segment provide all the disclosures required by the amendments in this update. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. A public entity should apply the amendments in this update retrospectively to all prior periods presented in the consolidated financial statements. Early adoption is permitted. We currently have one reportable operating segment. This ASU will not impact our consolidated financial statements and will have minimal impact to our disclosures, requiring identification of the chief operating decision maker and the information used to make operating decisions and to allocate resources. ASU 2023-09 In December 2023, the FASB issued ASU 2023-09, “ Income Taxes (Topic 740): Improvements to Income Tax Disclosures” that require public business entities to annually disclose (1) specific categories in their rate reconciliation; (2) additional information for reconciling items that meet a quantitative threshold; (3) the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes; (4) the amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions in which the income taxes paid that meet a quantitative threshold; (5) income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign; and (6) income tax expense (or benefit) from continuing operations disaggregated by federal, state, and foreign. The ASU eliminates the requirement to disclose the nature and estimate of the range of the reasonably possible change in the unrecognized tax benefits balance in the next 12 months and to disclose the cumulative amount of each type of temporary difference when a deferred tax liability is not recognized because of the exceptions to comprehensive recognition of deferred taxes related to subsidiaries and corporate joint ventures. For public business entities, the amendments are effective for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments should be applied on a prospective basis, but retrospective application is permitted. HTLF is currently evaluating the impact of the standard and does not anticipate it will have a significant impact on the results of operations, financial position, or liquidity. Qualified Affordable Housing Investments HTLF elected to use the proportional amortization method for investments in low-income housing projects. HTLF’s net investments in low-income housing projects were $5.7 million and $5.9 million as of March 31, 2024, and December 31, 2023, respectively, and are included in other assets in the consolidated balance sheet. With respect to HTLF’s investment in low-income housing projects for the three months ended March 31, 2024, we recognized income tax credits and other income tax benefits of $257,000 and $33,000, respectively. The total income tax benefits of $290,000 are partially offset in the “income taxes” item in the consolidated statements of income by $235,000 of investment amortization recognized, for a net income tax benefit of $55,000. The cash flows related to the total income tax benefits are presented in the following line items in the statement of cash flows: • $55,000 Net Income Tax Benefit, in the "Net income" line item in operating activities; • $235,000 Investment Amortization, in the "Other, net" line item, which is an adjustment to reconcile net income (loss) to cash from (used for) operating activities; • $257,000 Tax Credits, in the "Other, net" line item, which is also an adjustment to reconcile net income (loss) to cash from (used for) operating activities; and • $33,000 Other Tax Benefits Recognized, in the "Other, net" line item, which is also an adjustment to reconcile net income (loss) to cash from (used for) operating activities. There was no non-income-tax-related activity or impairment losses related to the low-income housing investments this reporting period.
Fair Value Hierarchy	Under ASC 820, assets and liabilities are grouped at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1 — Valuation is based upon quoted prices for identical instruments in active markets. Level 2 — Valuation is based upon quoted prices for similar instruments in active markets, or similar instruments in markets that are not active, and model-based valuation techniques for all significant assumptions are observable in the market. Level 3 — Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include use of option pricing models, discounted cash flow models and similar techniques. The following is a description of valuation methodologies used for assets and liabilities recorded at fair value on a recurring or non-recurring basis. Securities Available for Sale and Held to Maturity Securities available for sale are recorded at fair value on a recurring basis. Securities held to maturity are generally recorded at cost. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security's credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, as well as U.S. Treasury securities. Level 2 securities include U.S. government and agency securities, mortgage and asset-backed securities and private collateralized mortgage obligations, municipal bonds and corporate debt securities. On a quarterly basis, a secondary independent pricing service is used for the securities portfolio to validate the pricing from HTLF's primary pricing service. Equity Securities with a Readily Determinable Fair Value Equity securities with a readily determinable fair value generally include Community Reinvestment Act mutual funds and are classified as Level 2 due to the infrequent trading of these securities. The fair value is based on the price per share. Loans Held for Sale Loans held for sale are carried at the lower of cost or fair value on an aggregate basis. The fair value of loans held for sale is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, HTLF classifies loans held for sale subjected to nonrecurring fair value adjustments as Level 2. As of March 31, 2024, loans held for sale includes $352.7 million related to the Rocky Mountain Bank division. HTLF Bank signed definitive agreements in February of 2024 to sell all nine Rocky Mountain Bank branches in Montana. Loans Held to Maturity HTLF does not record loans held to maturity at fair value on a recurring basis. However, from time to time, certain loans are considered collateral dependent and an allowance for credit losses is established. The fair value of individually assessed loans is measured using the fair value of the collateral. In accordance with ASC 820, individually assessed loans measured at fair value are classified as nonrecurring Level 3 in the fair value hierarchy. Premises, Furniture and Equipment Held for Sale HTLF considers third party appraisals less estimated disposal costs, as well as independent fair value assessments from realtors or persons involved in selling bank premises, furniture and equipment, in determining the fair value of particular properties held for sale. Accordingly, the valuation of premises, furniture and equipment held for sale is subject to significant external and internal judgment. HTLF periodically reviews premises, furniture and equipment held for sale to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. Premises, furniture and equipment held for sale are classified as nonrecurring Level 3 in the fair value hierarchy. As of March 31, 2024, premises, furniture and equipment held for sale includes $13.2 million related to the Rocky Mountain Bank division. HTLF Bank signed definitive agreements in February of 2024 to sell all nine Rocky Mountain Bank branches in Montana. The properties will transfer upon completion of the sales transactions. Derivative Financial Instruments HTLF's current interest rate risk strategy includes cash flow hedges and interest rate swaps. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. To comply with the provisions of ASC 820, HTLF incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, HTLF has considered the impact of netting any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although HTLF has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2024, and December 31, 2023, HTLF has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, HTLF has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. Other Real Estate Owned Other real estate owned ("OREO") represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the fair value of the property at the time of acquisition (representing the property's cost basis), plus any acquisition costs, or the estimated fair value of the property, less disposal costs. HTLF considers third party appraisals, as well as independent fair value assessments from realtors or persons involved in selling OREO, in determining the fair value of particular properties. Accordingly, the valuation of OREO is subject to significant external and internal judgment. HTLF periodically reviews OREO to determine if the fair value of the property, less disposal costs, has declined below its recorded book value and records any adjustments accordingly. OREO is classified as nonrecurring Level 3 of the fair value hierarchy.

BASIS OF PRESENTATION (Tables)

BASIS OF PRESENTATION (Tables)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Amounts used in the determination of basic and diluted earnings per share for the three months ended March 31, 2024 and 2023, are shown in the table below, dollars and number of shares in thousands, except per share data: Three Months Ended 2024 2023 Net income attributable to HTLF $ 51,707 $ 52,776 Preferred dividends (2,013) (2,013) Net income available to common stockholders $ 49,694 $ 50,763 Weighted average common shares outstanding for basic earnings per share 42,807 42,615 Assumed incremental common shares issued upon vesting of outstanding restricted stock units 109 128 Weighted average common shares for diluted earnings per share 42,916 42,743 Earnings per common share — basic $ 1.16 $ 1.19 Earnings per common share — diluted $ 1.16 $ 1.19 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation 27 50 Number of antidilutive stock options excluded from diluted earnings per share computation 53 61

SECURITIES (Tables)

SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Available for Sale Securities	The amortized cost, gross unrealized gains and losses, and estimated fair values of debt securities available for sale and equity securities with a readily determinable fair value that are carried at fair value as of March 31, 2024, and December 31, 2023, are summarized in the table below, in thousands: Amortized Gross Gross Estimated March 31, 2024 U.S. treasuries $ 32,481 $ — $ (259) $ 32,222 U.S. agencies 14,084 — (192) 13,892 Obligations of states and political subdivisions 836,830 5 (109,344) 727,491 Mortgage-backed securities - agency 1,590,782 13 (231,254) 1,359,541 Mortgage-backed securities - non-agency 1,542,986 37 (85,225) 1,457,798 Commercial mortgage-backed securities - agency 75,782 — (11,708) 64,074 Commercial mortgage-backed securities - non-agency 436,274 — (10,180) 426,094 Asset-backed securities 214,676 — (17,568) 197,108 Corporate bonds 121,108 — (2,407) 118,701 Total debt securities 4,865,003 55 (468,137) 4,396,921 Equity securities with a readily determinable fair value 21,301 — — 21,301 Total $ 4,886,304 $ 55 $ (468,137) $ 4,418,222 December 31, 2023 U.S. treasuries $ 32,459 $ — $ (341) $ 32,118 U.S. agencies 14,724 — (194) 14,530 Obligations of states and political subdivisions 839,754 25 (98,534) 741,245 Mortgage-backed securities - agency 1,620,409 13 (226,793) 1,393,629 Mortgage-backed securities - non-agency 1,616,414 363 (87,649) 1,529,128 Commercial mortgage-backed securities - agency 76,076 — (11,288) 64,788 Commercial mortgage-backed securities - non-agency 526,974 — (12,116) 514,858 Asset-backed securities 232,140 — (14,770) 217,370 Corporate bonds 120,338 — (2,169) 118,169 Total debt securities 5,079,288 401 (453,854) 4,625,835 Equity securities with a readily determinable fair value 21,056 — — 21,056 Total $ 5,100,344 $ 401 $ (453,854) $ 4,646,891
Schedule of Held to Maturity Securities	The amortized cost, gross unrealized gains and losses and estimated fair values of held to maturity securities as of March 31, 2024, and December 31, 2023, are summarized in the table below, in thousands: Amortized Gross Gross Estimated March 31, 2024 Obligations of states and political subdivisions $ 841,055 $ 3,158 (30,461) $ 813,752 Total $ 841,055 $ 3,158 $ (30,461) $ 813,752 December 31, 2023 Obligations of states and political subdivisions $ 838,241 $ 3,622 $ (25,464) $ 816,399 Total $ 838,241 $ 3,622 $ (25,464) $ 816,399 Securities held to maturity Less than 12 months 12 months or longer Total Fair Unrealized Count Fair Unrealized Count Fair Unrealized Count March 31, 2024 Obligations of states and political subdivisions $ 51,881 $ (1,347) 13 $ 670,921 $ (29,114) 141 $ 722,802 $ (30,461) 154 Total temporarily impaired securities $ 51,881 (1,347) 13 $ 670,921 $ (29,114) 141 $ 722,802 (30,461) 154 December 31, 2023 Obligations of states and political subdivisions $ 145,471 $ (3,706) 23 $ 569,691 $ (21,758) 126 $ 715,162 $ (25,464) 149 Total temporarily impaired securities $ 145,471 $ (3,706) 23 $ 569,691 $ (21,758) 126 $ 715,162 $ (25,464) 149
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of investment securities carried at fair value at March 31, 2024, by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. March 31, 2024 Amortized Cost Estimated Fair Value Due in 1 year or less $ 25,192 $ 25,066 Due in 1 to 5 years 62,702 61,628 Due in 5 to 10 years 21,452 19,054 Due after 10 years 895,157 786,558 Total debt securities 1,004,503 892,306 Mortgage and asset-backed securities 3,860,500 3,504,615 Equity securities with a readily determinable fair value 21,301 21,301 Total investment securities $ 4,886,304 $ 4,418,222 The amortized cost and estimated fair value of debt securities held to maturity at March 31, 2024, by contractual maturity, are as follows, in thousands. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without penalties. March 31, 2024 Amortized Cost Estimated Fair Value Due in 1 year or less $ 8,147 $ 8,149 Due in 1 to 5 years 91,287 90,939 Due in 5 to 10 years 207,209 204,220 Due after 10 years 534,412 510,444 Total debt securities $ 841,055 $ 813,752
Schedule of Realized Gross Gains (Losses)	Gross gains and losses realized related to the sales of securities carried at fair value for the three months ended March 31, 2024 and 2023, are summarized as follows, in thousands: Three Months Ended 2024 2023 Proceeds from sales $ — $ 146,448 Gross security gains — — Gross security losses — 1,104
Schedule of Debt Securities Available-for-sale	The following table summarizes, in thousands, the amount of unrealized losses, defined as the amount by which cost or amortized cost exceeds fair value, and the related fair value of investments with unrealized losses in the securities portfolio as of March 31, 2024, and December 31, 2023. The investments were segregated into two categories: those that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or more. The reference point for determining how long an investment was in an unrealized loss position w as March 31, 2023, and December 31, 2023 , respectively. Debt securities available for sale Less than 12 months 12 months or longer Total Fair Unrealized Count Fair Unrealized Count Fair Unrealized Count March 31, 2024 U.S. treasuries $ 2,975 $ (20) 1 $ 29,247 $ (239) 4 $ 32,222 $ (259) 5 U.S. agencies — — — 13,892 (192) 4 13,892 (192) 4 Obligations of states and political subdivisions 1,689 (16) 3 721,778 (109,328) 148 723,467 (109,344) 151 Mortgage-backed securities - agency — — — 1,358,884 (231,254) 166 1,358,884 (231,254) 166 Mortgage-backed securities - non-agency 395,105 (22,829) 12 880,665 (62,396) 35 1,275,770 (85,225) 47 Commercial mortgage-backed securities - agency — — — 64,074 (11,708) 17 64,074 (11,708) 17 Commercial mortgage-backed securities - non-agency 7,735 (78) 1 418,359 (10,102) 16 426,094 (10,180) 17 Asset-backed securities 132,551 (12,303) 4 64,557 (5,265) 7 197,108 (17,568) 11 Corporate bonds 61,403 (510) 1 57,298 (1,897) 8 118,701 (2,407) 9 Total temporarily impaired securities $ 601,458 $ (35,756) 22 $ 3,608,754 $ (432,381) 405 $ 4,210,212 $ (468,137) 427 December 31, 2023 U.S. treasuries $ 2,985 $ (12) 1 $ 26,138 $ (329) 3 $ 29,123 $ (341) 4 U.S. agencies — — — 14,530 (194) 4 14,530 (194) 4 Obligations of states and political subdivisions 1,440 (65) 1 736,653 (98,469) 150 738,093 (98,534) 151 Mortgage-backed securities - agency 194 (2) 2 1,392,769 (226,791) 166 1,392,963 (226,793) 168 Mortgage-backed securities - non-agency 415,934 (24,568) 12 902,291 (63,081) 35 1,318,225 (87,649) 47 Commercial mortgage-backed securities - agency — — — 64,788 (11,288) 17 64,788 (11,288) 17 Commercial mortgage-backed securities - non-agency — — — 507,044 (12,116) 16 507,044 (12,116) 16 Asset-backed securities 148,063 (9,723) 4 69,307 (5,047) 7 217,370 (14,770) 11 Corporate bonds 61,031 (111) 1 57,138 (2,058) 8 118,169 (2,169) 9 Total temporarily impaired securities $ 629,647 $ (34,481) 21 $ 3,770,658 $ (419,373) 406 $ 4,400,305 $ (453,854) 427
Schedule of Financing Receivable Credit Quality Indicators	The following table summarizes, in thousands, the carrying amount of HTLF's held to maturity debt securities by investment rating as of March 31, 2024, and December 31, 2023, which are updated quarterly and used to monitor the credit quality of the securities: March 31, 2024 December 31, 2023 Rating AAA $ 88,849 $ 88,550 AA, AA+, AA- 575,331 583,816 A+, A, A- 150,409 139,658 BBB 20,111 20,133 Not Rated 6,355 6,084 Total $ 841,055 $ 838,241 The following table shows the risk category of loans by loan category, year of origination and charge-offs as of March 31, 2024, in thousands: As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total Commercial and industrial Pass $ 85,028 $ 592,529 $ 710,480 $ 286,818 $ 163,724 $ 374,702 $ 1,122,778 $ 3,336,059 Watch 13,514 20,205 16,882 12,357 1,657 3,862 31,468 99,945 Substandard 267 18,289 20,161 3,011 5,439 11,091 50,789 109,047 Commercial and industrial total $ 98,809 $ 631,023 $ 747,523 $ 302,186 $ 170,820 $ 389,655 $ 1,205,035 $ 3,545,051 Commercial and industrial charge-offs $ — $ 8 $ 766 $ 50 $ 511 $ 26 $ 936 $ 2,297 As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total PPP Pass $ — $ — $ — $ 1,877 $ 41 $ — $ — $ 1,918 Watch — — — 254 — — — 254 Substandard — — — — — — — — PPP total $ — $ — $ — $ 2,131 $ 41 $ — $ — $ 2,172 PPP charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Owner occupied commercial real estate Pass $ 83,691 $ 406,814 $ 532,653 $ 728,430 $ 209,476 $ 413,348 $ 43,734 $ 2,418,146 Watch — 3,924 30,954 8,071 3,802 12,888 — 59,639 Substandard — 23,469 13,465 2,256 20,279 7,779 — 67,248 Owner occupied commercial real estate total $ 83,691 $ 434,207 $ 577,072 $ 738,757 $ 233,557 $ 434,015 $ 43,734 $ 2,545,033 Owner occupied commercial real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Non-owner occupied commercial real estate Pass $ 14,376 $ 459,002 $ 661,486 $ 423,897 $ 184,310 $ 465,008 $ 16,824 $ 2,224,903 Watch 4,917 66,454 34,504 4,320 3,987 91,904 5,122 211,208 Substandard — 5,043 — 8,648 — 45,266 — 58,957 Non-owner occupied commercial real estate total $ 19,293 $ 530,499 $ 695,990 $ 436,865 $ 188,297 $ 602,178 $ 21,946 $ 2,495,068 Non-owner occupied commercial real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Real estate construction Pass $ 12,901 $ 308,707 $ 410,479 $ 121,769 $ 7,877 $ 11,397 $ 7,544 $ 880,674 Watch — 708 70,775 51,157 107 — — 122,747 Substandard — 9,006 28,989 — — 81 86 38,162 Real estate construction total $ 12,901 $ 318,421 $ 510,243 $ 172,926 $ 7,984 $ 11,478 $ 7,630 $ 1,041,583 Real estate construction charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Agricultural and agricultural real estate Pass $ 17,192 $ 121,110 $ 182,587 $ 103,742 $ 54,124 $ 62,884 $ 220,613 $ 762,252 Watch 340 3,738 1,546 744 723 49 2,444 9,584 Substandard — 160 22,825 1,506 4 12,698 847 38,040 Agricultural and agricultural real estate total $ 17,532 $ 125,008 $ 206,958 $ 105,992 $ 54,851 $ 75,631 $ 223,904 $ 809,876 Agricultural and agricultural real estate charge-offs $ — $ — $ — $ — $ — $ 167 $ 100 $ 267 Residential real estate Pass $ 13,804 $ 65,266 $ 167,944 $ 223,447 $ 70,074 $ 183,684 $ 17,444 $ 741,663 Watch 3 176 146 935 686 3,704 252 5,902 Substandard — 727 145 3,358 427 3,799 — 8,456 Residential real estate total $ 13,807 $ 66,169 $ 168,235 $ 227,740 $ 71,187 $ 191,187 $ 17,696 $ 756,021 Residential real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Consumer Pass $ 8,163 $ 40,081 $ 53,661 $ 31,283 $ 4,008 $ 7,704 $ 295,533 $ 440,433 Watch — 749 175 94 612 962 2,528 5,120 Substandard 191 91 202 403 1,117 1,331 949 4,284 Consumer total $ 8,354 $ 40,921 $ 54,038 $ 31,780 $ 5,737 $ 9,997 $ 299,010 $ 449,837 Consumer charge-offs $ — $ 30 $ 76 $ 44 $ 10 $ 29 $ 1,340 $ 1,529 As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total Total Pass $ 235,155 $ 1,993,509 $ 2,719,290 $ 1,921,263 $ 693,634 $ 1,518,727 $ 1,724,470 $ 10,806,048 Total Watch 18,774 95,954 154,982 77,932 11,574 113,369 41,814 514,399 Total Substandard 458 56,785 85,787 19,182 27,266 82,045 52,671 324,194 Total Loans $ 254,387 $ 2,146,248 $ 2,960,059 $ 2,018,377 $ 732,474 $ 1,714,141 $ 1,818,955 $ 11,644,641 Total charge-offs $ — $ 38 $ 842 $ 94 $ 521 $ 222 $ 2,376 $ 4,093 The following table shows the risk category of loans by loan category and year of origination as of December 31, 2023, in thousands. As of December 31, 2023 Amortized Cost Basis of Term Loans by Year of Origination 2023 2022 2021 2020 2019 2018 and Prior Revolving Total Commercial and industrial Pass $ 608,030 $ 779,218 $ 333,900 $ 187,406 $ 78,455 $ 327,775 $ 1,159,397 $ 3,474,181 Watch 20,694 19,788 257 3,631 2,398 2,953 28,749 78,470 Substandard 20,171 12,658 2,636 5,447 18,535 7,489 32,460 99,396 Commercial and industrial total $ 648,895 $ 811,664 $ 336,793 $ 196,484 $ 99,388 $ 338,217 $ 1,220,606 $ 3,652,047 Commercial and industrial charge-offs 245 794 680 1,425 563 1,949 2,966 8,622 PPP Pass $ — $ — $ 2,591 $ 50 $ — $ — $ — $ 2,641 Watch — — 89 — — — — 89 Substandard — — 47 — — — — 47 PPP total $ — $ — $ 2,727 $ 50 $ — $ — $ — $ 2,777 PPP charge-offs — — — — — — — — Owner occupied commercial real estate Pass $ 443,683 $ 547,898 $ 799,978 $ 225,257 $ 225,405 $ 224,608 $ 41,072 $ 2,507,901 Watch 8,052 25,947 13,114 2,662 8,115 7,553 — 65,443 Substandard 31,904 10,489 2,268 11,609 6,390 2,171 — 64,831 Owner occupied commercial real estate total $ 483,639 $ 584,334 $ 815,360 $ 239,528 $ 239,910 $ 234,332 $ 41,072 $ 2,638,175 Owner occupied commercial real estate charge-offs — 802 — 5 — 63 — 870 Non-owner occupied commercial real estate Pass $ 480,683 $ 656,824 $ 423,420 $ 203,330 $ 262,541 $ 251,499 $ 26,978 $ 2,305,275 Watch 71,400 34,651 8,237 3,834 27,345 57,083 — 202,550 Substandard 5,043 952 1,391 — 4,238 34,262 — 45,886 Non-owner occupied commercial real estate total $ 557,126 $ 692,427 $ 433,048 $ 207,164 $ 294,124 $ 342,844 $ 26,978 $ 2,553,711 Non-owner occupied commercial real estate charge-offs — 52 — 29 399 147 — 627 Real estate construction Pass $ 283,519 $ 468,646 $ 176,604 $ 9,889 $ 11,048 $ 3,405 $ 6,486 $ 959,597 Watch 629 33,220 9,418 72 — 65 — 43,404 Substandard — 8,522 — 107 — — 86 8,715 As of December 31, 2023 Amortized Cost Basis of Term Loans by Year of Origination 2023 2022 2021 2020 2019 2018 and Prior Revolving Total Real estate construction total $ 284,148 $ 510,388 $ 186,022 $ 10,068 $ 11,048 $ 3,470 $ 6,572 $ 1,011,716 Real estate construction charge-offs 284 — — 32 — — — 316 Agricultural and agricultural real estate Pass $ 152,665 $ 208,375 $ 114,798 $ 67,006 $ 28,247 $ 43,663 $ 260,941 $ 875,695 Watch 2,245 16,257 293 622 70 349 427 20,263 Substandard 12 7,616 1,649 4 855 12,591 499 23,226 Agricultural and agricultural real estate total $ 154,922 $ 232,248 $ 116,740 $ 67,632 $ 29,172 $ 56,603 $ 261,867 $ 919,184 Agricultural and agricultural real estate charge-offs — — — 9 — 1 5,309 5,319 Residential real estate Pass $ 71,470 $ 177,564 $ 241,362 $ 73,029 $ 42,526 $ 155,899 $ 19,534 $ 781,384 Watch 171 973 945 659 158 4,845 — 7,751 Substandard 741 150 3,400 464 290 3,649 — 8,694 Residential real estate total $ 72,382 $ 178,687 $ 245,707 $ 74,152 $ 42,974 $ 164,393 $ 19,534 $ 797,829 Residential real estate charge-offs — 59 124 — — — — 183 Consumer Pass $ 45,595 $ 62,900 $ 35,459 $ 7,731 $ 3,663 $ 6,109 $ 324,218 $ 485,675 Watch 730 84 694 21 41 644 2,060 4,274 Substandard 80 308 401 75 159 1,769 465 3,257 Consumer total $ 46,405 $ 63,292 $ 36,554 $ 7,827 $ 3,863 $ 8,522 $ 326,743 $ 493,206 Consumer charge-offs 2 246 154 27 19 112 3,117 3,677 Total Pass $ 2,085,645 $ 2,901,425 $ 2,128,112 $ 773,698 $ 651,885 $ 1,012,958 $ 1,838,626 $ 11,392,349 Total Watch 103,921 130,920 33,047 11,501 38,127 73,492 31,236 422,244 Total Substandard 57,951 40,695 11,792 17,706 30,467 61,931 33,510 254,052 Total Loans $ 2,247,517 $ 3,073,040 $ 2,172,951 $ 802,905 $ 720,479 $ 1,148,381 $ 1,903,372 $ 12,068,645 Total charge-offs $ 531 $ 1,953 $ 958 $ 1,527 $ 981 $ 2,272 $ 11,392 $ 19,614

LOANS (Tables)

LOANS (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Schedule of Loans	Loans as of March 31, 2024, and December 31, 2023, were as follows, in thousands: March 31, 2024 December 31, 2023 Loans receivable held to maturity: Commercial and industrial $ 3,545,051 $ 3,652,047 Paycheck Protection Program ("PPP") 2,172 2,777 Owner occupied commercial real estate 2,545,033 2,638,175 Non-owner occupied commercial real estate 2,495,068 2,553,711 Real estate construction 1,041,583 1,011,716 Agricultural and agricultural real estate 809,876 919,184 Residential real estate 756,021 797,829 Consumer 449,837 493,206 Total loans receivable held to maturity 11,644,641 12,068,645 Allowance for credit losses (123,934) (122,566) Loans receivable, net $ 11,520,707 $ 11,946,079
Allowance for Loan and Lease Losses, Based on Impairment Methodology	The following table shows the balance in the allowance for credit losses at March 31, 2024, and December 31, 2023, and the related loan balances, disaggregated on the basis of measurement methodology, in thousands. If a loan no longer shares similar risk characteristics with other loans in the pool, it is evaluated on an individual basis and is not included in the collective evaluation. Lending relationships on nonaccrual with $500,000 or more of total exposure are individually assessed using a collateral dependency calculation. All other loans are collectively evaluated for losses. Allowance For Credit Losses Gross Loans Receivable Held to Maturity Individually Evaluated for Credit Losses Collectively Evaluated for Credit Losses Total Loans Individually Evaluated for Credit Losses Loans Collectively Evaluated for Credit Losses Total March 31, 2024 Commercial and industrial $ 20,555 $ 20,550 $ 41,105 $ 42,847 $ 3,502,204 $ 3,545,051 PPP — — — — 2,172 2,172 Owner occupied commercial real estate — 14,395 14,395 30,089 2,514,944 2,545,033 Non-owner occupied commercial real estate — 15,770 15,770 — 2,495,068 2,495,068 Real estate construction 56 34,869 34,925 697 1,040,886 1,041,583 Agricultural and agricultural real estate 2,479 2,629 5,108 7,143 802,733 809,876 Residential real estate — 5,155 5,155 727 755,294 756,021 Consumer — 7,476 7,476 — 449,837 449,837 Total $ 23,090 $ 100,844 $ 123,934 $ 81,503 $ 11,563,138 $ 11,644,641 December 31, 2023 Commercial and industrial $ 18,425 $ 22,254 $ 40,679 $ 41,847 $ 3,610,200 $ 3,652,047 PPP — — — — 2,777 2,777 Owner occupied commercial real estate — 17,156 17,156 30,400 2,607,775 2,638,175 Non-owner occupied commercial real estate — 17,249 17,249 — 2,553,711 2,553,711 Real estate construction 56 28,717 28,773 697 1,011,019 1,011,716 Agricultural and agricultural real estate 1,932 2,360 4,292 6,700 912,484 919,184 Residential real estate — 5,845 5,845 741 797,088 797,829 Consumer — 8,572 8,572 — 493,206 493,206 Total $ 20,413 $ 102,153 $ 122,566 $ 80,385 $ 11,988,260 $ 12,068,645
Financing Receivable, Loan Modification	The following tables show the amortized cost basis as of March 31, 2024 and March 31, 2023, of the loans modified during the three months ended March 31, 2024 and March 31, 2023, to borrowers experiencing financial difficulty by loan category and type of concession granted, dollars in thousands. Loan Modifications Made to Borrowers Experiencing Financial Difficulty Term Extension Term Extension and Interest Only Payments For the Three Months Ended March 31, 2024 Amortized % of Loan Amortized % of Loan Commercial and industrial $ 267 0.01 % $ — — % Real estate construction 739 0.07 — — Total $ 1,006 0.01 % $ — — % Loan Modifications Made to Borrowers Experiencing Financial Difficulty Term Extension Term Extension and Interest Only Payments For the Three Months Ended March 31, 2023 Amortized % of Amortized % of Commercial $ 3,682 0.11 % $ — — % Owner occupied commercial real estate — — 5,043 0.22 Real estate construction 1,498 0.06 — — Residential real estate 762 0.01 — — Total $ 5,942 0.05 % $ 5,043 0.22 % The following tables describe the financial effect of the modifications made to borrowers experiencing financial difficulty in the three months ending March 31, 2024 and March 31, 2023. For the Three Months Ended March 31, 2024 Weighted Average Weighted Average Term Extension Commercial and industrial 6 0 Real estate construction 4 0 For the Three Months Ended March 31, 2023 Weighted Average Weighted Average Term Extension Commercial and industrial 10 0 Owner occupied commercial real estate 0 12 Real estate construction 6 0 Residential real estate 12 0 Accruing Loans 30-59 60-89 90 Days or Total Past Due Current Nonaccrual March 31, 2024 Commercial and industrial $ — $ — $ — $ — $ 267 $ — Real estate construction — — — — 739 — Total $ — $ — $ — $ — $ 1,006 $ —
Schedule of Financing Receivable Credit Quality Indicators	The following table summarizes, in thousands, the carrying amount of HTLF's held to maturity debt securities by investment rating as of March 31, 2024, and December 31, 2023, which are updated quarterly and used to monitor the credit quality of the securities: March 31, 2024 December 31, 2023 Rating AAA $ 88,849 $ 88,550 AA, AA+, AA- 575,331 583,816 A+, A, A- 150,409 139,658 BBB 20,111 20,133 Not Rated 6,355 6,084 Total $ 841,055 $ 838,241 The following table shows the risk category of loans by loan category, year of origination and charge-offs as of March 31, 2024, in thousands: As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total Commercial and industrial Pass $ 85,028 $ 592,529 $ 710,480 $ 286,818 $ 163,724 $ 374,702 $ 1,122,778 $ 3,336,059 Watch 13,514 20,205 16,882 12,357 1,657 3,862 31,468 99,945 Substandard 267 18,289 20,161 3,011 5,439 11,091 50,789 109,047 Commercial and industrial total $ 98,809 $ 631,023 $ 747,523 $ 302,186 $ 170,820 $ 389,655 $ 1,205,035 $ 3,545,051 Commercial and industrial charge-offs $ — $ 8 $ 766 $ 50 $ 511 $ 26 $ 936 $ 2,297 As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total PPP Pass $ — $ — $ — $ 1,877 $ 41 $ — $ — $ 1,918 Watch — — — 254 — — — 254 Substandard — — — — — — — — PPP total $ — $ — $ — $ 2,131 $ 41 $ — $ — $ 2,172 PPP charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Owner occupied commercial real estate Pass $ 83,691 $ 406,814 $ 532,653 $ 728,430 $ 209,476 $ 413,348 $ 43,734 $ 2,418,146 Watch — 3,924 30,954 8,071 3,802 12,888 — 59,639 Substandard — 23,469 13,465 2,256 20,279 7,779 — 67,248 Owner occupied commercial real estate total $ 83,691 $ 434,207 $ 577,072 $ 738,757 $ 233,557 $ 434,015 $ 43,734 $ 2,545,033 Owner occupied commercial real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Non-owner occupied commercial real estate Pass $ 14,376 $ 459,002 $ 661,486 $ 423,897 $ 184,310 $ 465,008 $ 16,824 $ 2,224,903 Watch 4,917 66,454 34,504 4,320 3,987 91,904 5,122 211,208 Substandard — 5,043 — 8,648 — 45,266 — 58,957 Non-owner occupied commercial real estate total $ 19,293 $ 530,499 $ 695,990 $ 436,865 $ 188,297 $ 602,178 $ 21,946 $ 2,495,068 Non-owner occupied commercial real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Real estate construction Pass $ 12,901 $ 308,707 $ 410,479 $ 121,769 $ 7,877 $ 11,397 $ 7,544 $ 880,674 Watch — 708 70,775 51,157 107 — — 122,747 Substandard — 9,006 28,989 — — 81 86 38,162 Real estate construction total $ 12,901 $ 318,421 $ 510,243 $ 172,926 $ 7,984 $ 11,478 $ 7,630 $ 1,041,583 Real estate construction charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Agricultural and agricultural real estate Pass $ 17,192 $ 121,110 $ 182,587 $ 103,742 $ 54,124 $ 62,884 $ 220,613 $ 762,252 Watch 340 3,738 1,546 744 723 49 2,444 9,584 Substandard — 160 22,825 1,506 4 12,698 847 38,040 Agricultural and agricultural real estate total $ 17,532 $ 125,008 $ 206,958 $ 105,992 $ 54,851 $ 75,631 $ 223,904 $ 809,876 Agricultural and agricultural real estate charge-offs $ — $ — $ — $ — $ — $ 167 $ 100 $ 267 Residential real estate Pass $ 13,804 $ 65,266 $ 167,944 $ 223,447 $ 70,074 $ 183,684 $ 17,444 $ 741,663 Watch 3 176 146 935 686 3,704 252 5,902 Substandard — 727 145 3,358 427 3,799 — 8,456 Residential real estate total $ 13,807 $ 66,169 $ 168,235 $ 227,740 $ 71,187 $ 191,187 $ 17,696 $ 756,021 Residential real estate charge-offs $ — $ — $ — $ — $ — $ — $ — $ — Consumer Pass $ 8,163 $ 40,081 $ 53,661 $ 31,283 $ 4,008 $ 7,704 $ 295,533 $ 440,433 Watch — 749 175 94 612 962 2,528 5,120 Substandard 191 91 202 403 1,117 1,331 949 4,284 Consumer total $ 8,354 $ 40,921 $ 54,038 $ 31,780 $ 5,737 $ 9,997 $ 299,010 $ 449,837 Consumer charge-offs $ — $ 30 $ 76 $ 44 $ 10 $ 29 $ 1,340 $ 1,529 As of March 31, 2024 Amortized Cost Basis of Term Loans by Year of Origination 2024 2023 2022 2021 2020 2019 and Prior Revolving Total Total Pass $ 235,155 $ 1,993,509 $ 2,719,290 $ 1,921,263 $ 693,634 $ 1,518,727 $ 1,724,470 $ 10,806,048 Total Watch 18,774 95,954 154,982 77,932 11,574 113,369 41,814 514,399 Total Substandard 458 56,785 85,787 19,182 27,266 82,045 52,671 324,194 Total Loans $ 254,387 $ 2,146,248 $ 2,960,059 $ 2,018,377 $ 732,474 $ 1,714,141 $ 1,818,955 $ 11,644,641 Total charge-offs $ — $ 38 $ 842 $ 94 $ 521 $ 222 $ 2,376 $ 4,093 The following table shows the risk category of loans by loan category and year of origination as of December 31, 2023, in thousands. As of December 31, 2023 Amortized Cost Basis of Term Loans by Year of Origination 2023 2022 2021 2020 2019 2018 and Prior Revolving Total Commercial and industrial Pass $ 608,030 $ 779,218 $ 333,900 $ 187,406 $ 78,455 $ 327,775 $ 1,159,397 $ 3,474,181 Watch 20,694 19,788 257 3,631 2,398 2,953 28,749 78,470 Substandard 20,171 12,658 2,636 5,447 18,535 7,489 32,460 99,396 Commercial and industrial total $ 648,895 $ 811,664 $ 336,793 $ 196,484 $ 99,388 $ 338,217 $ 1,220,606 $ 3,652,047 Commercial and industrial charge-offs 245 794 680 1,425 563 1,949 2,966 8,622 PPP Pass $ — $ — $ 2,591 $ 50 $ — $ — $ — $ 2,641 Watch — — 89 — — — — 89 Substandard — — 47 — — — — 47 PPP total $ — $ — $ 2,727 $ 50 $ — $ — $ — $ 2,777 PPP charge-offs — — — — — — — — Owner occupied commercial real estate Pass $ 443,683 $ 547,898 $ 799,978 $ 225,257 $ 225,405 $ 224,608 $ 41,072 $ 2,507,901 Watch 8,052 25,947 13,114 2,662 8,115 7,553 — 65,443 Substandard 31,904 10,489 2,268 11,609 6,390 2,171 — 64,831 Owner occupied commercial real estate total $ 483,639 $ 584,334 $ 815,360 $ 239,528 $ 239,910 $ 234,332 $ 41,072 $ 2,638,175 Owner occupied commercial real estate charge-offs — 802 — 5 — 63 — 870 Non-owner occupied commercial real estate Pass $ 480,683 $ 656,824 $ 423,420 $ 203,330 $ 262,541 $ 251,499 $ 26,978 $ 2,305,275 Watch 71,400 34,651 8,237 3,834 27,345 57,083 — 202,550 Substandard 5,043 952 1,391 — 4,238 34,262 — 45,886 Non-owner occupied commercial real estate total $ 557,126 $ 692,427 $ 433,048 $ 207,164 $ 294,124 $ 342,844 $ 26,978 $ 2,553,711 Non-owner occupied commercial real estate charge-offs — 52 — 29 399 147 — 627 Real estate construction Pass $ 283,519 $ 468,646 $ 176,604 $ 9,889 $ 11,048 $ 3,405 $ 6,486 $ 959,597 Watch 629 33,220 9,418 72 — 65 — 43,404 Substandard — 8,522 — 107 — — 86 8,715 As of December 31, 2023 Amortized Cost Basis of Term Loans by Year of Origination 2023 2022 2021 2020 2019 2018 and Prior Revolving Total Real estate construction total $ 284,148 $ 510,388 $ 186,022 $ 10,068 $ 11,048 $ 3,470 $ 6,572 $ 1,011,716 Real estate construction charge-offs 284 — — 32 — — — 316 Agricultural and agricultural real estate Pass $ 152,665 $ 208,375 $ 114,798 $ 67,006 $ 28,247 $ 43,663 $ 260,941 $ 875,695 Watch 2,245 16,257 293 622 70 349 427 20,263 Substandard 12 7,616 1,649 4 855 12,591 499 23,226 Agricultural and agricultural real estate total $ 154,922 $ 232,248 $ 116,740 $ 67,632 $ 29,172 $ 56,603 $ 261,867 $ 919,184 Agricultural and agricultural real estate charge-offs — — — 9 — 1 5,309 5,319 Residential real estate Pass $ 71,470 $ 177,564 $ 241,362 $ 73,029 $ 42,526 $ 155,899 $ 19,534 $ 781,384 Watch 171 973 945 659 158 4,845 — 7,751 Substandard 741 150 3,400 464 290 3,649 — 8,694 Residential real estate total $ 72,382 $ 178,687 $ 245,707 $ 74,152 $ 42,974 $ 164,393 $ 19,534 $ 797,829 Residential real estate charge-offs — 59 124 — — — — 183 Consumer Pass $ 45,595 $ 62,900 $ 35,459 $ 7,731 $ 3,663 $ 6,109 $ 324,218 $ 485,675 Watch 730 84 694 21 41 644 2,060 4,274 Substandard 80 308 401 75 159 1,769 465 3,257 Consumer total $ 46,405 $ 63,292 $ 36,554 $ 7,827 $ 3,863 $ 8,522 $ 326,743 $ 493,206 Consumer charge-offs 2 246 154 27 19 112 3,117 3,677 Total Pass $ 2,085,645 $ 2,901,425 $ 2,128,112 $ 773,698 $ 651,885 $ 1,012,958 $ 1,838,626 $ 11,392,349 Total Watch 103,921 130,920 33,047 11,501 38,127 73,492 31,236 422,244 Total Substandard 57,951 40,695 11,792 17,706 30,467 61,931 33,510 254,052 Total Loans $ 2,247,517 $ 3,073,040 $ 2,172,951 $ 802,905 $ 720,479 $ 1,148,381 $ 1,903,372 $ 12,068,645 Total charge-offs $ 531 $ 1,953 $ 958 $ 1,527 $ 981 $ 2,272 $ 11,392 $ 19,614
Past Due Financing Receivables	The following table sets forth information regarding accruing and nonaccrual loans at March 31, 2024, and December 31, 2023, in thousands: Accruing Loans 30-59 60-89 90 Days or Total Current Nonaccrual Total Loans March 31, 2024 Commercial and industrial $ 6,540 $ 512 $ 437 $ 7,489 $ 3,490,499 $ 47,063 $ 3,545,051 PPP — — — — 2,172 — 2,172 Owner occupied commercial real estate 1,969 74 — 2,043 2,511,873 31,117 2,545,033 Non-owner occupied commercial real estate — — — — 2,495,068 — 2,495,068 Real estate construction 3,931 19,968 — 23,899 1,016,781 903 1,041,583 Agricultural and agricultural real estate 382 — 12 394 800,038 9,444 809,876 Residential real estate 818 53 103 974 750,166 4,881 756,021 Consumer 855 818 59 1,732 446,713 1,392 449,837 Total loans receivable held to maturity $ 14,495 $ 21,425 $ 611 $ 36,531 $ 11,513,310 $ 94,800 $ 11,644,641 December 31, 2023 Commercial and industrial $ 1,738 $ 126 $ 2,203 $ 4,067 $ 3,601,165 $ 46,815 $ 3,652,047 PPP 94 53 — 147 2,630 — 2,777 Owner occupied commercial real estate 205 2,664 74 2,943 2,603,640 31,592 2,638,175 Non-owner occupied commercial real estate 875 — — 875 2,552,469 367 2,553,711 Real estate construction 332 — — 332 1,010,601 783 1,011,716 Agricultural and agricultural real estate 121 — 12 133 909,841 9,210 919,184 Residential real estate 2,082 273 21 2,376 790,367 5,086 797,829 Consumer 2,257 150 197 2,604 489,029 1,573 493,206 Total loans receivable held to maturity $ 7,704 $ 3,266 $ 2,507 $ 13,477 $ 11,959,742 $ 95,426 $ 12,068,645

ALLOWANCE FOR CREDIT LOSSES (Ta

ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2024
Loans and Leases Receivable Disclosure [Abstract]
Changes in the Allowance for Loan and Leases Losses	Changes in the allowance for credit losses on loans for the three months ended March 31, 2024, and March 31, 2023, were as follows, in thousands: Commercial Owner Occupied Commercial Non-Owner Occupied Commercial Real Estate Real Estate Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2023 $ 40,679 $ 17,156 $ 17,249 $ 28,773 $ 4,292 $ 5,845 $ 8,572 $ 122,566 Charge-offs (2,297) — — — (267) — (1,529) (4,093) Recoveries 562 — — — — 35 1,196 1,793 Provision (benefit) 2,161 (2,761) (1,479) 6,152 1,083 (725) (763) 3,668 Balance at March 31, 2024 $ 41,105 $ 14,395 $ 15,770 $ 34,925 $ 5,108 $ 5,155 $ 7,476 $ 123,934 Commercial Owner Occupied Commercial Non-Owner Occupied Commercial Real Estate Real Estate Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2022 $ 29,071 $ 13,948 $ 16,539 $ 29,998 $ 2,634 $ 7,711 $ 9,582 $ 109,483 Charge-offs (1,451) (14) — — — — (686) (2,151) Recoveries 1,722 112 — 17 10 19 1,311 3,191 Provision (benefit) 2,481 105 523 123 (98) (166) (784) 2,184 Balance at March 31, 2023 $ 31,823 $ 14,151 $ 17,062 $ 30,138 $ 2,546 $ 7,564 $ 9,423 $ 112,707
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Changes in the allowance for credit losses for unfunded commitments for the three months ended March 31, 2024, and March 31, 2023, were as follows: For the Three Months Ended September 30, For the Three Months Ended March 31, 2024 2023 Balance at December 31, $ 16,468 $ 20,196 Provision (benefit) (2,682) 890 Balance at March 31, $ 13,786 $ 21,086

GOODWILL AND CORE DEPOSIT INT_2

GOODWILL AND CORE DEPOSIT INTANGIBLE ASSETS (Tables)	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets	The gross carrying amount of other intangible assets consisted of core deposit intangibles and the associated accumulated amortization at March 31, 2024, and December 31, 2023, are presented in the table below, in thousands: March 31, 2024 December 31, 2023 Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 101,185 $ 84,262 $ 16,923 $ 101,185 $ 82,770 $ 18,415 Total $ 101,185 $ 84,262 $ 16,923 $ 101,185 $ 82,770 $ 18,415
Schedule of Estimated Future Amortization Expense of Amortizable Intangible Assets	The following table shows the estimated future amortization expense for amortizable intangible assets, in thousands: Core Deposit Intangibles Nine months ending December 31, 2024 $ 4,099 Year ending December 31, 2025 4,700 2026 3,533 2027 2,601 2028 1,287 2029 466 Thereafter 237 Total $ 16,923

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Balance Sheet Category and Fair Values of Embedded Derivatives	The table below identifies the effect of fair value hedge accounting on the consolidated statements of income, in thousands: Three Months Ended 2024 2023 Hedged item (loans receivable held to maturity) $ (30,529) $ 16 Hedged item (securities carried at fair value) (20,151) — Derivatives designated as hedging instruments on loans receivable held to maturity 30,537 (15) Derivatives designated as hedging instruments on securities carried at fair value 19,848 — Notional Amount Fair Value Balance Sheet Category March 31, 2024 Embedded derivatives $ 2,344 $ 70 Other assets December 31, 2023 Embedded derivatives $ 2,391 $ 61 Other assets The table below identifies the gains and losses recognized on HTLF's embedded derivatives for the three months ended March 31, 2024, and March 31, 2023, in thousands: Three Months Ended 2024 2023 Gain (loss) recognized in other noninterest income on embedded derivatives $ 9 $ (37)
Gains (Losses) on Derivative Instruments	The table below identifies the gains and losses recognized on HTLF's terminated derivative instruments designated as cash flow hedges for the three months ended March 31, 2024, and March 31, 2023, in thousands: Recognized in OCI Reclassified from AOCI into Income Amount of Gain (Loss) Category Amount of Gain (Loss) Three Months Ended March 31, 2024 Interest rate swap $ — Interest income $ (35) Three Months Ended March 31, 2023 Interest rate swap $ 1,952 Interest income $ 591 The table below identifies the net impact to interest income recognized on HTLF's fair value hedges specific to the fair value remeasurements and the income statement classification where it is recorded in comparison to the total amount of interest income presented on the consolidated statements of income for the three months ended March 31, 2024, and March 31, 2023, in thousands: Three Months Ended 2024 2023 Gain (loss) recognized in interest income and fees on loans $ 8 $ 1 Total amount of interest and fees on loans 195,661 153,843 Gain (loss) recognized in interest income on securities-taxable (303) — Total amount of interest on securities-taxable 47,014 55,976
Balance Sheet Category and Fair Values of Derivative Instruments	The table below identifies the fair value of the interest rate swaps designated as fair value hedges and the balance sheet category of the interest rate swaps as of March 31, 2024 and December 31, 2023, in thousands: Fair Value Balance Sheet Category March 31, 2024 Interest rate swaps-loans receivable held to maturity $ 13,901 Other assets Interest rate swaps-securities carried at fair value 42,972 Other assets Interest rate swaps-loans receivable held to maturity 5,946 Other liabilities December 31, 2023 Interest rate swaps-loans receivable held to maturity $ 5,027 Other assets Interest rate swaps-securities carried at fair value 23,182 Other assets Interest rate swaps-loans receivable held to maturity 27,554 Other liabilities The table below identifies the carrying amount of the hedged assets and cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets that are designated as fair value hedge accounting relationships at March 31, 2024, and December 31, 2023, in thousands: Location in the consolidated Carrying Amount of Cumulative Amount of Fair Value March 31, 2024 Interest rate swap Loans receivable held to maturity $ 2,494,674 $ (5,885) Interest rate swap Securities carried at fair value 756,035 (40,827) December 31, 2023 Interest rate swap Loans receivable held to maturity $ 2,525,261 $ 24,652 Interest rate swap Securities carried at fair value $ 786,716 $ (20,979) The table below identifies the balance sheet category and fair values of the derivative instruments designated as loan swaps at March 31, 2024, and December 31, 2023, in thousands: Notional Fair Balance Sheet March 31, 2024 Customer interest rate swaps $ 1,744,314 $ 63,517 Other assets Customer interest rate swaps 1,744,314 (63,517) Other liabilities December 31, 2023 Customer interest rate swaps $ 1,672,729 $ 56,634 Other assets Customer interest rate swaps 1,672,729 (56,634) Other liabilities
Schedule of Other Derivatives Not Designated as Hedging Instruments, Balance Sheet and Income Category	The table below identifies the balance sheet category and fair values of HTLF's other free standing derivative instruments not designated as hedging instruments at March 31, 2024, and December 31, 2023, in thousands: Notional Amount Fair Value Balance Sheet Category March 31, 2024 Undesignated interest rate swaps 2,344 (70) Other liabilities December 31, 2023 Undesignated interest rate swaps 2,391 (61) Other liabilities HTLF recognizes gains and losses on other free standing derivatives in two separate income statement categories. Interest rate lock commitments and forward commitments are recognized in net gains on sale of loans held for sale and undesignated interest rate swaps are recognized in other noninterest income. As of the balance sheet dates presented above there were no interest rate lock commitments or forward commitments. The table below identifies the gains and losses recognized in income on HTLF's other free standing derivative instruments not designated as hedging instruments for the three months ended March 31, 2024, and March 31, 2023, in thousands: Three Months Ended 2024 2023 Interest rate lock commitments (mortgage) $ — $ 410 Forward commitments — 272 Undesignated interest rate swaps 9 37

FAIR VALUE (Tables)

FAIR VALUE (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The table below presents HTLF's assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2024, and December 31, 2023, in thousands, aggregated by the level in the fair value hierarchy within which those measurements fall: Total Fair Value Level 1 Level 2 Level 3 March 31, 2024 Assets Securities available for sale U.S. treasuries $ 32,222 $ 32,222 $ — $ — U.S. agencies 13,892 — 13,892 — Obligations of states and political subdivisions 727,491 — 727,491 — Mortgage-backed securities - agency 1,359,541 — 1,359,541 — Mortgage-backed securities - non-agency 1,457,798 — 1,457,798 — Commercial mortgage-backed securities - agency 64,074 — 64,074 — Commercial mortgage-backed securities - non-agency 426,094 — 426,094 — Asset-backed securities 197,108 — 197,108 — Corporate bonds 118,701 — 118,701 — Equity securities with a readily determinable fair value 21,301 — 21,301 — Derivative financial instruments (1) 120,460 — 120,460 — Total assets at fair value $ 4,538,682 $ 32,222 $ 4,506,460 $ — Liabilities Derivative financial instruments (2) $ 69,533 $ — $ 69,533 $ — Total liabilities at fair value $ 69,533 $ — $ 69,533 $ — December 31, 2023 Assets Securities available for sale U.S. treasuries $ 32,118 $ 32,118 $ — $ — U.S. agencies 14,530 — 14,530 — Obligations of states and political subdivisions 741,245 — 741,245 — Mortgage-backed securities - agency 1,393,629 — 1,393,629 — Mortgage-backed securities - non-agency 1,529,128 — 1,529,128 — Commercial mortgage-backed securities - agency 64,788 — 64,788 — Commercial mortgage-backed securities - non-agency 514,858 — 514,858 — Asset-backed securities 217,370 — 217,370 — Corporate bonds 118,169 — 118,169 — Equity securities with a readily determinable fair value 21,056 — 21,056 — Derivative financial instruments (1) 84,904 — 84,904 — Total assets at fair value $ 4,731,795 $ 32,118 $ 4,699,677 $ — Liabilities Derivative financial instruments (2) $ 84,249 $ — $ 84,249 $ — Total liabilities at fair value $ 84,249 $ — $ 84,249 $ — (1) Includes interest rate swaps, fair value hedges, embedded derivatives and back-to-back loan swaps. (2) Includes fair value hedges, back-to-back loan swaps and free standing derivatives.
Fair Value Measurements, Nonrecurring	The tables below present HTLF's assets that are measured at fair value on a nonrecurring basis as of March 31, 2024, and December 31, 2023, in thousands: Fair Value Measurements at March 31, 2024 Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 22,292 $ — $ — $ 22,292 $ — Owner occupied commercial real estate 30,089 — — 30,089 — Non-owner occupied commercial real estate — — — — — Real estate construction 642 — — 642 — Agricultural and agricultural real estate 4,664 — — 4,664 — Residential real estate 727 — — 727 — Total collateral dependent individually assessed loans $ 58,414 $ — $ — $ 58,414 $ — Loans held for sale $ 352,744 $ — $ 352,744 $ — $ — Other real estate owned 2,590 — — 2,590 539 Premises, furniture and equipment held for sale 16,064 — — 16,064 7 Fair Value Measurements at December 31, 2023 Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 23,422 $ — $ — $ 23,422 $ 554 Owner occupied commercial real estate 30,400 — — 30,400 — Non-owner occupied commercial real estate — — — — — Real estate construction 642 — — 642 — Agricultural and agricultural real estate 4,768 — — 4,768 5,309 Residential real estate 741 — — 741 — Total collateral dependent individually assessed loans $ 59,973 $ — $ — $ 59,973 $ 5,863 Loans held for sale $ 5,071 $ — $ 5,071 $ — $ — Other real estate owned 12,548 — — 12,548 2,967 Premises, furniture and equipment held for sale 4,069 — — 4,069 2,786
Fair Value Inputs, Assets, Quantitative Information	The following tables present additional quantitative information about assets measured at fair value on a recurring and nonrecurring basis and for which HTLF has utilized Level 3 inputs to determine fair value, in thousands: Fair Value at Valuation Unobservable Range (Weighted Other real estate owned 2,590 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Premises, furniture and equipment held for sale 16,064 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Collateral dependent individually assessed loans: Commercial 22,292 Modified appraised value Third party appraisal (1) Appraisal discount 0-12% (2) Owner occupied commercial real estate 30,089 Modified appraised value Third party appraisal (1) Appraisal discount 0-20% (2) Non-owner occupied commercial real estate — Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Real estate construction 642 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Agricultural and agricultural real estate 4,664 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Residential real estate 727 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) (1) Third party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (2) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral. Fair Value at 12/31/2023 Valuation Unobservable Range (Weighted Average) Other real estate owned 2,590 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Premises, furniture and equipment held for sale 16,064 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Collateral dependent individually assessed loans: Commercial and industrial 23,422 Modified appraised value Third party appraisal (1) Appraisal discount 0-12% (2) Owner occupied commercial real estate 30,400 Modified appraised value Third party appraisal (1) Appraisal discount 0-20% (2) Non-owner occupied commercial real estate — Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Real estate construction 642 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) Agricultural and agricultural real estate 4,768 Modified appraised value Third party appraisal (1) Appraisal discount 0-15% (2) Residential real estate 741 Modified appraised value Third party appraisal (1) Appraisal discount 0-10% (2) (1) Third-party appraisals are obtained and updated at least annually to establish the value of the underlying asset, but the disclosure of the unobservable inputs used by the appraisers would not be meaningful because the range will vary widely from appraisal to appraisal. (2) Discounts applied to the appraised values primarily include estimated sales costs, but also consider the age of the appraisal, changes in local market conditions and changes in the current condition of the collateral.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Fair Value, by Balance Sheet Grouping	The table below is a summary of the estimated fair value of HTLF's financial instruments (as defined by ASC 825) as of March 31, 2024, and December 31, 2023, in thousands. The carrying amounts in the following tables are recorded in the consolidated balance sheets under the indicated captions. In accordance with ASC 825, the assets and liabilities that are not financial instruments are not included in the disclosure, including the value of premises, furniture and equipment, premises, furniture and equipment held for sale, OREO, goodwill, and other intangibles and other liabilities. HTLF does not believe that the estimated information presented herein is representative of the earnings power or value of HTLF. The following analysis, which is inherently limited in depicting fair value, also does not consider any value associated with either existing customer relationships or the ability of HTLF to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different. Fair Value Measurements at March 31, 2024 Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 444,366 $ 444,366 $ 444,366 $ — $ — Time deposits in other financial institutions 1,240 1,240 1,240 — — Securities: Carried at fair value 4,418,222 4,418,222 32,222 4,386,000 — Held to maturity 841,055 813,752 — 813,752 — Other investments 68,524 68,524 — 68,524 — Loans held for sale 352,744 352,744 — 352,744 — Loans, net: Commercial and industrial 3,503,946 3,301,416 — 3,279,124 22,292 PPP 2,172 2,172 — 2,172 — Owner occupied commercial real estate 2,530,638 2,356,849 — 2,326,760 30,089 Non-owner occupied commercial real estate 2,479,298 2,350,454 — 2,350,454 — Real estate construction 1,006,658 1,002,602 — 1,001,960 642 Agricultural and agricultural real estate 804,768 734,698 — 730,034 4,664 Residential real estate 750,866 654,298 — 653,571 727 Consumer 442,361 424,618 — 424,618 — Total Loans, net 11,520,707 10,827,107 — 10,768,693 58,414 Cash surrender value on life insurance 197,671 197,671 — 197,671 — Derivative financial instruments (1) 120,460 120,460 — 120,460 — Financial liabilities: Deposits Demand deposits 4,264,390 4,264,390 — 4,264,390 — Savings deposits 8,669,221 8,669,221 — 8,669,221 — Time deposits 2,368,555 2,368,555 — 2,368,555 — Deposits held for sale 596,328 631,274 — 631,274 — Borrowings 650,033 650,033 — 650,033 — Term Debt 372,652 374,240 — 374,240 — Derivative financial instruments (2) 69,533 69,533 — 69,533 — (1) Includes interest rate swaps, fair value hedges, embedded derivatives and back-to-back loan swaps. (2) Includes fair value hedges, back-to-back loan swaps and undesignated interest rate swaps. Fair Value Measurements at Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 323,013 $ 323,013 $ 323,013 $ — $ — Time deposits in other financial institutions 1,240 1,240 1,240 — — Securities: Carried at fair value 4,646,891 4,646,891 32,118 4,614,773 — Held to maturity 838,241 816,399 — 816,399 — Other investments 91,277 91,277 — 91,277 — Loans held for sale 5,071 5,071 — 5,071 — Loans, net: Commercial and industrial 3,611,368 3,396,628 — 3,373,206 23,422 PPP 2,777 2,777 — 2,777 — Owner occupied commercial real estate 2,621,019 2,444,540 — 2,414,140 30,400 Non-owner occupied commercial real estate 2,536,462 2,393,931 — 2,393,931 — Real estate construction 982,943 979,105 — 978,463 642 Agricultural and agricultural real estate 914,892 839,572 — 834,804 4,768 Residential real estate 791,984 687,428 — 686,687 741 Consumer 484,634 465,686 — 465,686 — Total Loans, net 11,946,079 11,209,667 — 11,149,694 59,973 Cash surrender value on life insurance 197,085 197,085 — 197,085 — Derivative financial instruments (1) 84,904 84,904 — 84,904 — Financial liabilities: Deposits Demand deposits 4,500,304 4,500,304 — 4,500,304 — Savings deposits 8,805,597 8,805,597 — 8,805,597 — Time deposits 2,895,813 2,895,813 — 2,895,813 — Borrowings 622,255 622,255 — 622,255 — Term Debt 372,396 374,017 — 374,017 — Derivative financial instruments (2) 84,249 84,249 — 84,249 — (1) Includes interest rate swaps, fair value hedges, embedded derivatives and back-to-back loan swaps. (2) Includes fair value hedges, back-to-back loan swaps and undesignated interest rate swaps.

STOCK COMPENSATION (Tables)

STOCK COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Summary of Status of RSUs	A summary of the RSUs outstanding as of March 31, 2024, and March 31, 2023, and changes during the three months ended March 31, 2024 and 2023, follows: 2024 2023 Shares Weighted-Average Grant Date Shares Weighted-Average Grant Date Outstanding at January 1, 466,105 $ 47.22 424,086 $ 46.15 Granted 307,374 33.09 198,562 50.75 Vested (130,524) 50.28 (125,870) 42.15 Forfeited (32,624) 51.68 (21,338) 42.40 Outstanding at March 31, 610,331 $ 39.21 475,440 $ 49.30
Share-Based Payment Arrangement, Option, Activity	A summary of the status of stock options as of March 31, 2024, and March 31, 2023, and changes during the three months ended March 31, 2024 and 2023, follows: 2024 2023 Shares Weighted Average Shares Weighted Average Outstanding January 1, 58,066 $ 48.79 64,518 $ 48.79 Granted — — — — Exercised — — — — Forfeited (5,161) 48.79 (3,226) 48.79 Outstanding at March 31, 52,905 48.79 61,292 48.79 Options exercisable at March 31, 13,224 $ 48.79 — $ —

BASIS OF PRESENTATION (Narrativ

BASIS OF PRESENTATION (Narrative) (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Apr. 27, 2024 $ / shares	Mar. 31, 2024 USD ($) segment $ / shares	Apr. 28, 2024 $ / shares shares	Dec. 31, 2023 USD ($) $ / shares
Business Acquisition [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 1		$ 1
Number of operating segments | segment		1
Qualified Affordable Housing Investments
Affordable housing project investments		$ 5,700		$ 5,900
Affordable housing tax credits, amount		257
Affordable housing, other tax benefits, amount		33
Affordable housing tax credits and other tax benefits, amount		290
Affordable housing project investments, amortization		235
Income (loss) from affordable housing projects		$ 55
Subsequent Event | Bank Merger
Business Acquisition [Line Items]
Common stock, par value (in dollars per share) | $ / shares			$ 1
Business combination, equity interest conversion per common share (in shares) | shares			0.55
Business combination, equity interest conversion, per preferred share (in shares) | shares			1
Subsequent Event | Bank Merger | HTLF
Business Acquisition [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 1
Preferred stock, percentage	7%
Preferred stock, par value (in dollars per share) | $ / shares	$ 1

BASIS OF PRESENTATION (Earnings

BASIS OF PRESENTATION (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income attributable to HTLF	$ 51,707	$ 52,776
Preferred dividends	(2,013)	(2,013)
Net income available to common stockholders	$ 49,694	$ 50,763
Weighted average common shares outstanding for basic earnings per share (in shares)	42,807	42,615
Assumed incremental common shares issued upon vesting of outstanding restricted stock units (in shares)	109	128
Weighted average common shares for diluted earnings per share (in shares)	42,916	42,743
Earnings per common share — basic (in dollars per share)	$ 1.16	$ 1.19
Earnings per common share — diluted (in dollars per share)	$ 1.16	$ 1.19
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive common stock equivalents and stock options excluded from diluted earnings per share computation (in shares)	27	50
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of antidilutive common stock equivalents and stock options excluded from diluted earnings per share computation (in shares)	53	61

SECURITIES (Securities availabl

SECURITIES (Securities available for sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	$ 55	$ 401
Gross Unrealized Losses	(468,137)	(453,854)
Estimated Fair Value	892,306
Equity securities with a readily determinable fair value	21,301	21,056
Amortized Cost	4,886,304	5,100,344
Estimated Fair Value	4,418,222	4,646,891
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Total debt securities	4,865,003	5,079,288
Gross Unrealized Gains	55	401
Gross Unrealized Losses	(468,137)	(453,854)
Estimated Fair Value	4,396,921	4,625,835
U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Total debt securities	32,481	32,459
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(259)	(341)
Estimated Fair Value	32,222	32,118
U.S. agencies
Debt Securities, Available-for-sale [Line Items]
Total debt securities	14,084	14,724
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(192)	(194)
Estimated Fair Value	13,892	14,530
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Total debt securities	836,830	839,754
Gross Unrealized Gains	5	25
Gross Unrealized Losses	(109,344)	(98,534)
Estimated Fair Value	727,491	741,245
Mortgage-backed securities - agency
Debt Securities, Available-for-sale [Line Items]
Total debt securities	1,590,782	1,620,409
Gross Unrealized Gains	13	13
Gross Unrealized Losses	(231,254)	(226,793)
Estimated Fair Value	1,359,541	1,393,629
Mortgage-backed securities - non-agency
Debt Securities, Available-for-sale [Line Items]
Total debt securities	1,542,986	1,616,414
Gross Unrealized Gains	37	363
Gross Unrealized Losses	(85,225)	(87,649)
Estimated Fair Value	1,457,798	1,529,128
Commercial mortgage-backed securities - agency
Debt Securities, Available-for-sale [Line Items]
Total debt securities	75,782	76,076
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11,708)	(11,288)
Estimated Fair Value	64,074	64,788
Commercial mortgage-backed securities - non-agency
Debt Securities, Available-for-sale [Line Items]
Total debt securities	436,274	526,974
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(10,180)	(12,116)
Estimated Fair Value	426,094	514,858
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total debt securities	214,676	232,140
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(17,568)	(14,770)
Estimated Fair Value	197,108	217,370
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total debt securities	121,108	120,338
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,407)	(2,169)
Estimated Fair Value	$ 118,701	$ 118,169

SECURITIES (Held to maturity se

SECURITIES (Held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 841,055	$ 838,241
Gross Unrealized Gains	3,158	3,622
Gross Unrealized Losses	(30,461)	(25,464)
Estimated Fair Value	813,752	816,399
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	841,055	838,241
Gross Unrealized Gains	3,158	3,622
Gross Unrealized Losses	(30,461)	(25,464)
Estimated Fair Value	$ 813,752	$ 816,399

SECURITIES (Narrative) (Details

SECURITIES (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Accrued interest receivable	$ 25,300	$ 28,000
Debt securities, trading and equity securities, carrying value	4,886,304
Amortized cost of FHLBs	2,600	25,800
Asset Pledged as Collateral
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading and equity securities, carrying value	$ 2,610,000	$ 2,630,000

SECURITIES (Securities availa_2

SECURITIES (Securities available for sale debt maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 25,192
Due in 1 to 5 years	62,702
Due in 5 to 10 years	21,452
Due after 10 years	895,157
Total debt securities	1,004,503
Mortgage and asset-backed securities	3,860,500
Equity securities with a readily determinable fair value	21,301
Total investment securities	4,886,304
Estimated Fair Value
Due in 1 year or less	25,066
Due in 1 to 5 years	61,628
Due in 5 to 10 years	19,054
Due after 10 years	786,558
Estimated Fair Value	892,306
Mortgage and asset-backed securities	3,504,615
Equity securities with a readily determinable fair value	21,301	$ 21,056
Total investment securities	$ 4,418,222

SECURITIES (Securities held to

SECURITIES (Securities held to maturity debt maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 8,147
Due in 1 to 5 years	91,287
Due in 5 to 10 years	207,209
Due after 10 years	534,412
Total debt securities	841,055	$ 838,241
Estimated Fair Value
Due in 1 year or less	8,149
Due in 1 to 5 years	90,939
Due in 5 to 10 years	204,220
Due after 10 years	510,444
Estimated Fair Value	$ 813,752	$ 816,399

SECURITIES (Gross realized gain

SECURITIES (Gross realized gain (loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 0	$ 146,448
Gross security gains	0	0
Gross security losses	$ 0	$ 1,104

SECURITIES (Debt securities ava

SECURITIES (Debt securities available for sale) (Details) $ in Thousands	Mar. 31, 2024 USD ($) security investmentCategory	Dec. 31, 2023 USD ($) security
Fair Value
Less than 12 months	$ 601,458	$ 629,647
12 months or longer	3,608,754	3,770,658
Total	4,210,212	4,400,305
Unrealized Losses
Less than 12 months	(35,756)	(34,481)
12 months or longer	(432,381)	(419,373)
Total	$ (468,137)	$ (453,854)
Count
Less than 12 months | security	22	21
12 months or longer | security	405	406
Total | security	427	427
Number of investment categories | investmentCategory	2
U.S. treasuries
Fair Value
Less than 12 months	$ 2,975	$ 2,985
12 months or longer	29,247	26,138
Total	32,222	29,123
Unrealized Losses
Less than 12 months	(20)	(12)
12 months or longer	(239)	(329)
Total	$ (259)	$ (341)
Count
Less than 12 months | security	1	1
12 months or longer | security	4	3
Total | security	5	4
U.S. agencies
Fair Value
Less than 12 months	$ 0	$ 0
12 months or longer	13,892	14,530
Total	13,892	14,530
Unrealized Losses
Less than 12 months	0	0
12 months or longer	(192)	(194)
Total	$ (192)	$ (194)
Count
Less than 12 months | security	0	0
12 months or longer | security	4	4
Total | security	4	4
Obligations of states and political subdivisions
Fair Value
Less than 12 months	$ 1,689	$ 1,440
12 months or longer	721,778	736,653
Total	723,467	738,093
Unrealized Losses
Less than 12 months	(16)	(65)
12 months or longer	(109,328)	(98,469)
Total	$ (109,344)	$ (98,534)
Count
Less than 12 months | security	3	1
12 months or longer | security	148	150
Total | security	151	151
Mortgage-backed securities - agency
Fair Value
Less than 12 months	$ 0	$ 194
12 months or longer	1,358,884	1,392,769
Total	1,358,884	1,392,963
Unrealized Losses
Less than 12 months	0	(2)
12 months or longer	(231,254)	(226,791)
Total	$ (231,254)	$ (226,793)
Count
Less than 12 months | security	0	2
12 months or longer | security	166	166
Total | security	166	168
Mortgage-backed securities - non-agency
Fair Value
Less than 12 months	$ 395,105	$ 415,934
12 months or longer	880,665	902,291
Total	1,275,770	1,318,225
Unrealized Losses
Less than 12 months	(22,829)	(24,568)
12 months or longer	(62,396)	(63,081)
Total	$ (85,225)	$ (87,649)
Count
Less than 12 months | security	12	12
12 months or longer | security	35	35
Total | security	47	47
Commercial mortgage-backed securities - agency
Fair Value
Less than 12 months	$ 0	$ 0
12 months or longer	64,074	64,788
Total	64,074	64,788
Unrealized Losses
Less than 12 months	0	0
12 months or longer	(11,708)	(11,288)
Total	$ (11,708)	$ (11,288)
Count
Less than 12 months | security	0	0
12 months or longer | security	17	17
Total | security	17	17
Commercial mortgage-backed securities - non-agency
Fair Value
Less than 12 months	$ 7,735	$ 0
12 months or longer	418,359	507,044
Total	426,094	507,044
Unrealized Losses
Less than 12 months	(78)	0
12 months or longer	(10,102)	(12,116)
Total	$ (10,180)	$ (12,116)
Count
Less than 12 months | security	1	0
12 months or longer | security	16	16
Total | security	17	16
Asset-backed securities
Fair Value
Less than 12 months	$ 132,551	$ 148,063
12 months or longer	64,557	69,307
Total	197,108	217,370
Unrealized Losses
Less than 12 months	(12,303)	(9,723)
12 months or longer	(5,265)	(5,047)
Total	$ (17,568)	$ (14,770)
Count
Less than 12 months | security	4	4
12 months or longer | security	7	7
Total | security	11	11
Corporate bonds
Fair Value
Less than 12 months	$ 61,403	$ 61,031
12 months or longer	57,298	57,138
Total	118,701	118,169
Unrealized Losses
Less than 12 months	(510)	(111)
12 months or longer	(1,897)	(2,058)
Total	$ (2,407)	$ (2,169)
Count
Less than 12 months | security	1	1
12 months or longer | security	8	8
Total | security	9	9

SECURITIES (Securities held t_2

SECURITIES (Securities held to maturity) (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Fair Value
Less than 12 months	$ 51,881	$ 145,471
12 months or longer	670,921	569,691
Total	722,802	715,162
Unrealized Losses
Less than 12 months	(1,347)	(3,706)
12 months or longer	(29,114)	(21,758)
Total	$ (30,461)	$ (25,464)
Count
Less than 12 months | security	13	23
12 months or longer | security	141	126
Total | security	154	149
Obligations of states and political subdivisions
Fair Value
Less than 12 months	$ 51,881	$ 145,471
12 months or longer	670,921	569,691
Total	722,802	715,162
Unrealized Losses
Less than 12 months	(1,347)	(3,706)
12 months or longer	(29,114)	(21,758)
Total	$ (30,461)	$ (25,464)
Count
Less than 12 months | security	13	23
12 months or longer | security	141	126
Total | security	154	149

SECURITIES (Schedule of financi

SECURITIES (Schedule of financing receivable credit quality indicators) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 841,055	$ 838,241
AAA
Financing Receivable, Credit Quality Indicator [Line Items]
Total	88,849	88,550
AA, AA+, AA-
Financing Receivable, Credit Quality Indicator [Line Items]
Total	575,331	583,816
A+, A, A-
Financing Receivable, Credit Quality Indicator [Line Items]
Total	150,409	139,658
BBB
Financing Receivable, Credit Quality Indicator [Line Items]
Total	20,111	20,133
Not Rated
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 6,355	$ 6,084

LOANS (Loans held to maturity)

LOANS (Loans held to maturity) (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	$ 11,644,641,000	$ 12,068,645,000
Allowance for credit losses	(123,934,000)	(122,566,000)	$ (112,707,000)	$ (109,483,000)
Loans receivable, net	11,520,707,000	11,946,079,000
Paycheck Protection Program ("PPP")
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses	0
Commercial and industrial | Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	3,545,051,000	3,652,047,000
Allowance for credit losses	(41,105,000)	(40,679,000)	(31,823,000)	(29,071,000)
Commercial and industrial | Paycheck Protection Program ("PPP")
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	2,172,000	2,777,000
Allowance for credit losses	0	0
Commercial and industrial | Owner occupied commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	2,545,033,000	2,638,175,000
Allowance for credit losses	(14,395,000)	(17,156,000)	(14,151,000)	(13,948,000)
Commercial and industrial | Non-owner occupied commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	2,495,068,000	2,553,711,000
Allowance for credit losses	(15,770,000)	(17,249,000)	(17,062,000)	(16,539,000)
Commercial and industrial | Real Estate Construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	1,041,583,000	1,011,716,000
Allowance for credit losses	(34,925,000)	(28,773,000)	(30,138,000)	(29,998,000)
Agricultural and agricultural real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	809,876,000	919,184,000
Allowance for credit losses	(5,108,000)	(4,292,000)	(2,546,000)	(2,634,000)
Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	756,021,000	797,829,000
Allowance for credit losses	(5,155,000)	(5,845,000)	(7,564,000)	(7,711,000)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	449,837,000	493,206,000
Allowance for credit losses	$ (7,476,000)	$ (8,572,000)	$ (9,423,000)	$ (9,582,000)

LOANS (Narrative) (Details)

LOANS (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Loans and Leases [Line Items]
Accrued interest receivable	$ 66,400,000		$ 65,400,000
Total Loans	11,644,641,000		12,068,645,000
Allowance for credit losses	123,934,000	$ 112,707,000	$ 122,566,000	$ 109,483,000
Loans secured by residential real estate property in process of foreclosure	$ 189,000
Loans delinquent 30 to 89 days, percentage	0.31%		0.09%
Interest income on nonaccrual loans	$ 0	$ 0
Nonaccrual loans with no related allowance	51,100,000		$ 52,500,000
Unfunded commitments	0
Paycheck Protection Program ("PPP")
Loans and Leases [Line Items]
Allowance for credit losses	0
Paycheck Protection Program ("PPP") | Nonpass
Loans and Leases [Line Items]
Total Loans	$ 254,000		$ 136,000,000

LOANS (Allowance for credit los

LOANS (Allowance for credit losses on financing receivables) (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans individually evaluated for impairment, nonaccrual threshold	$ 500,000
Allowance For Credit Losses
Individually Evaluated for Credit Losses	23,090,000	$ 20,413,000
Collectively Evaluated for Credit Losses	100,844,000	102,153,000
Total	123,934,000	122,566,000	$ 112,707,000	$ 109,483,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	81,503,000	80,385,000
Loans Collectively Evaluated for Credit Losses	11,563,138,000	11,988,260,000
Total	11,644,641,000	12,068,645,000
Paycheck Protection Program ("PPP")
Allowance For Credit Losses
Total	0
Commercial and industrial | Commercial and industrial
Allowance For Credit Losses
Individually Evaluated for Credit Losses	20,555,000	18,425,000
Collectively Evaluated for Credit Losses	20,550,000	22,254,000
Total	41,105,000	40,679,000	31,823,000	29,071,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	42,847,000	41,847,000
Loans Collectively Evaluated for Credit Losses	3,502,204,000	3,610,200,000
Total	3,545,051,000	3,652,047,000
Commercial and industrial | Paycheck Protection Program ("PPP")
Allowance For Credit Losses
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	0	0
Total	0	0
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	2,172,000	2,777,000
Total	2,172,000	2,777,000
Commercial and industrial | Owner occupied commercial real estate
Allowance For Credit Losses
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	14,395,000	17,156,000
Total	14,395,000	17,156,000	14,151,000	13,948,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	30,089,000	30,400,000
Loans Collectively Evaluated for Credit Losses	2,514,944,000	2,607,775,000
Total	2,545,033,000	2,638,175,000
Commercial and industrial | Non-owner occupied commercial real estate
Allowance For Credit Losses
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	15,770,000	17,249,000
Total	15,770,000	17,249,000	17,062,000	16,539,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	2,495,068,000	2,553,711,000
Total	2,495,068,000	2,553,711,000
Commercial and industrial | Real estate construction
Allowance For Credit Losses
Individually Evaluated for Credit Losses	56,000	56,000
Collectively Evaluated for Credit Losses	34,869,000	28,717,000
Total	34,925,000	28,773,000	30,138,000	29,998,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	697,000	697,000
Loans Collectively Evaluated for Credit Losses	1,040,886,000	1,011,019,000
Total	1,041,583,000	1,011,716,000
Agricultural and agricultural real estate
Allowance For Credit Losses
Individually Evaluated for Credit Losses	2,479,000	1,932,000
Collectively Evaluated for Credit Losses	2,629,000	2,360,000
Total	5,108,000	4,292,000	2,546,000	2,634,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	7,143,000	6,700,000
Loans Collectively Evaluated for Credit Losses	802,733,000	912,484,000
Total	809,876,000	919,184,000
Residential real estate
Allowance For Credit Losses
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	5,155,000	5,845,000
Total	5,155,000	5,845,000	7,564,000	7,711,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	727,000	741,000
Loans Collectively Evaluated for Credit Losses	755,294,000	797,088,000
Total	756,021,000	797,829,000
Consumer
Allowance For Credit Losses
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	7,476,000	8,572,000
Total	7,476,000	8,572,000	$ 9,423,000	$ 9,582,000
Gross Loans Receivable Held to Maturity
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	449,837,000	493,206,000
Total	$ 449,837,000	$ 493,206,000

LOANS (Loan modifications) (Det

LOANS (Loan modifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 1,006	$ 5,942
% of Loan Category	0.01%	0.05%
Term Extension and Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 5,043
% of Loan Category	0%	0.22%
Commercial and industrial | Commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 267	$ 3,682
% of Loan Category	0.01%	0.11%
Commercial and industrial | Commercial and industrial | Term Extension and Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 0
% of Loan Category	0%	0%
Commercial and industrial | Real estate construction | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 739	$ 1,498
% of Loan Category	0.07%	0.06%
Commercial and industrial | Real estate construction | Term Extension and Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis	$ 0	$ 0
% of Loan Category	0%	0%
Commercial and industrial | Owner occupied commercial real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0
% of Loan Category		0%
Commercial and industrial | Owner occupied commercial real estate | Term Extension and Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 5,043
% of Loan Category		0.22%
Residential real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 762
% of Loan Category		0.01%
Residential real estate | Term Extension and Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis		$ 0
% of Loan Category		0%

LOANS (Financial effect of loan

LOANS (Financial effect of loan modifications) (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Commercial and industrial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Extension (months)	6 months	10 months
Weighted Average Term Extension and Interest Only Payments (months)	0 months	0 months
Commercial and industrial | Real Estate Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Extension (months)	4 months	6 months
Weighted Average Term Extension and Interest Only Payments (months)	0 months	0 months
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Extension (months)		0 months
Weighted Average Term Extension and Interest Only Payments (months)		12 months
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted Average Term Extension (months)		12 months
Weighted Average Term Extension and Interest Only Payments (months)		0 months

LOANS (Accruing loans - aging a

LOANS (Accruing loans - aging analysis) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	$ 0	$ 2,260
Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
90 Days or More Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	1,006	8,725
Commercial and industrial | Commercial and industrial | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Commercial and industrial | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Commercial and industrial | 90 Days or More Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Commercial and industrial | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	267	3,682
Commercial and industrial | Real Estate Construction | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	1,498
Commercial and industrial | Real Estate Construction | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Real Estate Construction | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Real Estate Construction | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Real Estate Construction | 90 Days or More Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	0	0
Commercial and industrial | Real Estate Construction | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans	$ 739	0
Commercial and industrial | Owner occupied commercial real estate | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Commercial and industrial | Owner occupied commercial real estate | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Commercial and industrial | Owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Commercial and industrial | Owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Commercial and industrial | Owner occupied commercial real estate | 90 Days or More Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Commercial and industrial | Owner occupied commercial real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		5,043
Residential real estate | Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		762
Residential real estate | Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Residential real estate | 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Residential real estate | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Residential real estate | 90 Days or More Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		0
Residential real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accruing Loans		$ 0

LOANS (Loans by credit quality

LOANS (Loans by credit quality indicator) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Amortized Cost Basis of Term Loans by Year of Origination
Year One	$ 254,387		$ 2,247,517
Year Two	2,146,248		3,073,040
Year Three	2,960,059		2,172,951
Year Four	2,018,377		802,905
Year Five	732,474		720,479
Year Six and Prior	1,714,141		1,148,381
Revolving	1,818,955		1,903,372
Total	11,644,641		12,068,645
Charge-offs
Year One	0		531
Year Two	38		1,953
Year Three	842		958
Year Four	94		1,527
Year Five	521		981
Year Six and Prior	222		2,272
Revolving	2,376		11,392
Total charge-offs	4,093	$ 2,151	19,614
Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	235,155		2,085,645
Year Two	1,993,509		2,901,425
Year Three	2,719,290		2,128,112
Year Four	1,921,263		773,698
Year Five	693,634		651,885
Year Six and Prior	1,518,727		1,012,958
Revolving	1,724,470		1,838,626
Total	10,806,048		11,392,349
Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	18,774		103,921
Year Two	95,954		130,920
Year Three	154,982		33,047
Year Four	77,932		11,501
Year Five	11,574		38,127
Year Six and Prior	113,369		73,492
Revolving	41,814		31,236
Total	514,399		422,244
Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	458		57,951
Year Two	56,785		40,695
Year Three	85,787		11,792
Year Four	19,182		17,706
Year Five	27,266		30,467
Year Six and Prior	82,045		61,931
Revolving	52,671		33,510
Total	324,194		254,052
Commercial and industrial | Commercial and industrial
Amortized Cost Basis of Term Loans by Year of Origination
Year One	98,809		648,895
Year Two	631,023		811,664
Year Three	747,523		336,793
Year Four	302,186		196,484
Year Five	170,820		99,388
Year Six and Prior	389,655		338,217
Revolving	1,205,035		1,220,606
Total	3,545,051		3,652,047
Charge-offs
Year One	0		245
Year Two	8		794
Year Three	766		680
Year Four	50		1,425
Year Five	511		563
Year Six and Prior	26		1,949
Revolving	936		2,966
Total charge-offs	2,297	1,451	8,622
Commercial and industrial | Commercial and industrial | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	85,028		608,030
Year Two	592,529		779,218
Year Three	710,480		333,900
Year Four	286,818		187,406
Year Five	163,724		78,455
Year Six and Prior	374,702		327,775
Revolving	1,122,778		1,159,397
Total	3,336,059		3,474,181
Commercial and industrial | Commercial and industrial | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	13,514		20,694
Year Two	20,205		19,788
Year Three	16,882		257
Year Four	12,357		3,631
Year Five	1,657		2,398
Year Six and Prior	3,862		2,953
Revolving	31,468		28,749
Total	99,945		78,470
Commercial and industrial | Commercial and industrial | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	267		20,171
Year Two	18,289		12,658
Year Three	20,161		2,636
Year Four	3,011		5,447
Year Five	5,439		18,535
Year Six and Prior	11,091		7,489
Revolving	50,789		32,460
Total	109,047		99,396
Commercial and industrial | Paycheck Protection Program ("PPP")
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		0
Year Two	0		0
Year Three	0		2,727
Year Four	2,131		50
Year Five	41		0
Year Six and Prior	0		0
Revolving	0		0
Total	2,172		2,777
Charge-offs
Year One	0		0
Year Two	0		0
Year Three	0		0
Year Four	0		0
Year Five	0		0
Year Six and Prior	0		0
Revolving	0		0
Total charge-offs	0		0
Commercial and industrial | Paycheck Protection Program ("PPP") | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		0
Year Two	0		0
Year Three	0		2,591
Year Four	1,877		50
Year Five	41		0
Year Six and Prior	0		0
Revolving	0		0
Total	1,918		2,641
Commercial and industrial | Paycheck Protection Program ("PPP") | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		0
Year Two	0		0
Year Three	0		89
Year Four	254		0
Year Five	0		0
Year Six and Prior	0		0
Revolving	0		0
Total	254		89
Commercial and industrial | Paycheck Protection Program ("PPP") | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		0
Year Two	0		0
Year Three	0		47
Year Four	0		0
Year Five	0		0
Year Six and Prior	0		0
Revolving	0		0
Total	0		47
Commercial and industrial | Owner occupied commercial real estate
Amortized Cost Basis of Term Loans by Year of Origination
Year One	83,691		483,639
Year Two	434,207		584,334
Year Three	577,072		815,360
Year Four	738,757		239,528
Year Five	233,557		239,910
Year Six and Prior	434,015		234,332
Revolving	43,734		41,072
Total	2,545,033		2,638,175
Charge-offs
Year One	0		0
Year Two	0		802
Year Three	0		0
Year Four	0		5
Year Five	0		0
Year Six and Prior	0		63
Revolving	0		0
Total charge-offs	0	14	870
Commercial and industrial | Owner occupied commercial real estate | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	83,691		443,683
Year Two	406,814		547,898
Year Three	532,653		799,978
Year Four	728,430		225,257
Year Five	209,476		225,405
Year Six and Prior	413,348		224,608
Revolving	43,734		41,072
Total	2,418,146		2,507,901
Commercial and industrial | Owner occupied commercial real estate | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		8,052
Year Two	3,924		25,947
Year Three	30,954		13,114
Year Four	8,071		2,662
Year Five	3,802		8,115
Year Six and Prior	12,888		7,553
Revolving	0		0
Total	59,639		65,443
Commercial and industrial | Owner occupied commercial real estate | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		31,904
Year Two	23,469		10,489
Year Three	13,465		2,268
Year Four	2,256		11,609
Year Five	20,279		6,390
Year Six and Prior	7,779		2,171
Revolving	0		0
Total	67,248		64,831
Commercial and industrial | Non-owner occupied commercial real estate
Amortized Cost Basis of Term Loans by Year of Origination
Year One	19,293		557,126
Year Two	530,499		692,427
Year Three	695,990		433,048
Year Four	436,865		207,164
Year Five	188,297		294,124
Year Six and Prior	602,178		342,844
Revolving	21,946		26,978
Total	2,495,068		2,553,711
Charge-offs
Year One	0		0
Year Two	0		52
Year Three	0		0
Year Four	0		29
Year Five	0		399
Year Six and Prior	0		147
Revolving	0		0
Total charge-offs	0	0	627
Commercial and industrial | Non-owner occupied commercial real estate | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	14,376		480,683
Year Two	459,002		656,824
Year Three	661,486		423,420
Year Four	423,897		203,330
Year Five	184,310		262,541
Year Six and Prior	465,008		251,499
Revolving	16,824		26,978
Total	2,224,903		2,305,275
Commercial and industrial | Non-owner occupied commercial real estate | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	4,917		71,400
Year Two	66,454		34,651
Year Three	34,504		8,237
Year Four	4,320		3,834
Year Five	3,987		27,345
Year Six and Prior	91,904		57,083
Revolving	5,122		0
Total	211,208		202,550
Commercial and industrial | Non-owner occupied commercial real estate | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		5,043
Year Two	5,043		952
Year Three	0		1,391
Year Four	8,648		0
Year Five	0		4,238
Year Six and Prior	45,266		34,262
Revolving	0		0
Total	58,957		45,886
Commercial and industrial | Real estate construction
Amortized Cost Basis of Term Loans by Year of Origination
Year One	12,901		284,148
Year Two	318,421		510,388
Year Three	510,243		186,022
Year Four	172,926		10,068
Year Five	7,984		11,048
Year Six and Prior	11,478		3,470
Revolving	7,630		6,572
Total	1,041,583		1,011,716
Charge-offs
Year One	0		284
Year Two	0		0
Year Three	0		0
Year Four	0		32
Year Five	0		0
Year Six and Prior	0		0
Revolving	0		0
Total charge-offs	0	0	316
Commercial and industrial | Real estate construction | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	12,901		283,519
Year Two	308,707		468,646
Year Three	410,479		176,604
Year Four	121,769		9,889
Year Five	7,877		11,048
Year Six and Prior	11,397		3,405
Revolving	7,544		6,486
Total	880,674		959,597
Commercial and industrial | Real estate construction | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		629
Year Two	708		33,220
Year Three	70,775		9,418
Year Four	51,157		72
Year Five	107		0
Year Six and Prior	0		65
Revolving	0		0
Total	122,747		43,404
Commercial and industrial | Real estate construction | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		0
Year Two	9,006		8,522
Year Three	28,989		0
Year Four	0		107
Year Five	0		0
Year Six and Prior	81		0
Revolving	86		86
Total	38,162		8,715
Agricultural and agricultural real estate
Amortized Cost Basis of Term Loans by Year of Origination
Year One	17,532		154,922
Year Two	125,008		232,248
Year Three	206,958		116,740
Year Four	105,992		67,632
Year Five	54,851		29,172
Year Six and Prior	75,631		56,603
Revolving	223,904		261,867
Total	809,876		919,184
Charge-offs
Year One	0		0
Year Two	0		0
Year Three	0		0
Year Four	0		9
Year Five	0		0
Year Six and Prior	167		1
Revolving	100		5,309
Total charge-offs	267	0	5,319
Agricultural and agricultural real estate | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	17,192		152,665
Year Two	121,110		208,375
Year Three	182,587		114,798
Year Four	103,742		67,006
Year Five	54,124		28,247
Year Six and Prior	62,884		43,663
Revolving	220,613		260,941
Total	762,252		875,695
Agricultural and agricultural real estate | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	340		2,245
Year Two	3,738		16,257
Year Three	1,546		293
Year Four	744		622
Year Five	723		70
Year Six and Prior	49		349
Revolving	2,444		427
Total	9,584		20,263
Agricultural and agricultural real estate | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		12
Year Two	160		7,616
Year Three	22,825		1,649
Year Four	1,506		4
Year Five	4		855
Year Six and Prior	12,698		12,591
Revolving	847		499
Total	38,040		23,226
Residential real estate
Amortized Cost Basis of Term Loans by Year of Origination
Year One	13,807		72,382
Year Two	66,169		178,687
Year Three	168,235		245,707
Year Four	227,740		74,152
Year Five	71,187		42,974
Year Six and Prior	191,187		164,393
Revolving	17,696		19,534
Total	756,021		797,829
Charge-offs
Year One	0		0
Year Two	0		59
Year Three	0		124
Year Four	0		0
Year Five	0		0
Year Six and Prior	0		0
Revolving	0		0
Total charge-offs	0	0	183
Residential real estate | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	13,804		71,470
Year Two	65,266		177,564
Year Three	167,944		241,362
Year Four	223,447		73,029
Year Five	70,074		42,526
Year Six and Prior	183,684		155,899
Revolving	17,444		19,534
Total	741,663		781,384
Residential real estate | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	3		171
Year Two	176		973
Year Three	146		945
Year Four	935		659
Year Five	686		158
Year Six and Prior	3,704		4,845
Revolving	252		0
Total	5,902		7,751
Residential real estate | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		741
Year Two	727		150
Year Three	145		3,400
Year Four	3,358		464
Year Five	427		290
Year Six and Prior	3,799		3,649
Revolving	0		0
Total	8,456		8,694
Consumer
Amortized Cost Basis of Term Loans by Year of Origination
Year One	8,354		46,405
Year Two	40,921		63,292
Year Three	54,038		36,554
Year Four	31,780		7,827
Year Five	5,737		3,863
Year Six and Prior	9,997		8,522
Revolving	299,010		326,743
Total	449,837		493,206
Charge-offs
Year One	0		2
Year Two	30		246
Year Three	76		154
Year Four	44		27
Year Five	10		19
Year Six and Prior	29		112
Revolving	1,340		3,117
Total charge-offs	1,529	$ 686	3,677
Consumer | Pass
Amortized Cost Basis of Term Loans by Year of Origination
Year One	8,163		45,595
Year Two	40,081		62,900
Year Three	53,661		35,459
Year Four	31,283		7,731
Year Five	4,008		3,663
Year Six and Prior	7,704		6,109
Revolving	295,533		324,218
Total	440,433		485,675
Consumer | Watch
Amortized Cost Basis of Term Loans by Year of Origination
Year One	0		730
Year Two	749		84
Year Three	175		694
Year Four	94		21
Year Five	612		41
Year Six and Prior	962		644
Revolving	2,528		2,060
Total	5,120		4,274
Consumer | Substandard
Amortized Cost Basis of Term Loans by Year of Origination
Year One	191		80
Year Two	91		308
Year Three	202		401
Year Four	403		75
Year Five	1,117		159
Year Six and Prior	1,331		1,769
Revolving	949		465
Total	$ 4,284		$ 3,257

LOANS (Past due financing recei

LOANS (Past due financing receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 94,800	$ 95,426
Total Loans	11,644,641	12,068,645
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	36,531	13,477
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	14,495	7,704
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	21,425	3,266
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	611	2,507
Current
Financing Receivable, Past Due [Line Items]
Total Loans	11,513,310	11,959,742
Commercial and industrial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual	47,063	46,815
Total Loans	3,545,051	3,652,047
Commercial and industrial | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	7,489	4,067
Commercial and industrial | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	6,540	1,738
Commercial and industrial | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	512	126
Commercial and industrial | Commercial and industrial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	437	2,203
Commercial and industrial | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total Loans	3,490,499	3,601,165
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0
Total Loans	2,172	2,777
Commercial and industrial | Paycheck Protection Program ("PPP") | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	147
Commercial and industrial | Paycheck Protection Program ("PPP") | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	94
Commercial and industrial | Paycheck Protection Program ("PPP") | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	53
Commercial and industrial | Paycheck Protection Program ("PPP") | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Commercial and industrial | Paycheck Protection Program ("PPP") | Current
Financing Receivable, Past Due [Line Items]
Total Loans	2,172	2,630
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	31,117	31,592
Total Loans	2,545,033	2,638,175
Commercial and industrial | Owner occupied commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	2,043	2,943
Commercial and industrial | Owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,969	205
Commercial and industrial | Owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	74	2,664
Commercial and industrial | Owner occupied commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	74
Commercial and industrial | Owner occupied commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	2,511,873	2,603,640
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	367
Total Loans	2,495,068	2,553,711
Commercial and industrial | Non-owner occupied commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	875
Commercial and industrial | Non-owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	875
Commercial and industrial | Non-owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Commercial and industrial | Non-owner occupied commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Commercial and industrial | Non-owner occupied commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	2,495,068	2,552,469
Commercial and industrial | Real estate construction
Financing Receivable, Past Due [Line Items]
Nonaccrual	903	783
Total Loans	1,041,583	1,011,716
Commercial and industrial | Real estate construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	23,899	332
Commercial and industrial | Real estate construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	3,931	332
Commercial and industrial | Real estate construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	19,968	0
Commercial and industrial | Real estate construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Commercial and industrial | Real estate construction | Current
Financing Receivable, Past Due [Line Items]
Total Loans	1,016,781	1,010,601
Agricultural and agricultural real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	9,444	9,210
Total Loans	809,876	919,184
Agricultural and agricultural real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	394	133
Agricultural and agricultural real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	382	121
Agricultural and agricultural real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	0	0
Agricultural and agricultural real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	12	12
Agricultural and agricultural real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	800,038	909,841
Residential real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	4,881	5,086
Total Loans	756,021	797,829
Residential real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	974	2,376
Residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	818	2,082
Residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	53	273
Residential real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	103	21
Residential real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans	750,166	790,367
Consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,392	1,573
Total Loans	449,837	493,206
Consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	1,732	2,604
Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	855	2,257
Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	818	150
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Loans	59	197
Consumer | Current
Financing Receivable, Past Due [Line Items]
Total Loans	$ 446,713	$ 489,029

ALLOWANCE FOR CREDIT LOSSES - S

ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 122,566	$ 109,483	$ 109,483
Charge-offs	(4,093)	(2,151)	(19,614)
Recoveries	1,793	3,191
Provision (benefit)	3,668	2,184
Ending Balance	123,934	112,707	122,566
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	16,468	20,196	20,196
Provision (benefit)	(2,682)	890
Ending balance	13,786	21,086	16,468
Agricultural and Agricultural Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,292	2,634	2,634
Charge-offs	(267)	0	(5,319)
Recoveries	0	10
Provision (benefit)	1,083	(98)
Ending Balance	5,108	2,546	4,292
Residential Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	5,845	7,711	7,711
Charge-offs	0	0	(183)
Recoveries	35	19
Provision (benefit)	(725)	(166)
Ending Balance	5,155	7,564	5,845
Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,572	9,582	9,582
Charge-offs	(1,529)	(686)	(3,677)
Recoveries	1,196	1,311
Provision (benefit)	(763)	(784)
Ending Balance	7,476	9,423	8,572
Commercial and Industrial | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	40,679	29,071	29,071
Charge-offs	(2,297)	(1,451)	(8,622)
Recoveries	562	1,722
Provision (benefit)	2,161	2,481
Ending Balance	41,105	31,823	40,679
Owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,156	13,948	13,948
Charge-offs	0	(14)	(870)
Recoveries	0	112
Provision (benefit)	(2,761)	105
Ending Balance	14,395	14,151	17,156
Non-owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,249	16,539	16,539
Charge-offs	0	0	(627)
Recoveries	0	0
Provision (benefit)	(1,479)	523
Ending Balance	15,770	17,062	17,249
Real Estate Construction | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning Balance	28,773	29,998	29,998
Charge-offs	0	0	(316)
Recoveries	0	17
Provision (benefit)	6,152	123
Ending Balance	$ 34,925	$ 30,138	$ 28,773

ALLOWANCE FOR CREDIT LOSSES - N

ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans transferred to held for sale	$ 352,744	$ 0
Rocky Mountain Bank
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, excluding accrued interest, transfer out, expense reversal		$ 2,000
Loans transferred to held for sale	$ 352,700

GOODWILL AND CORE DEPOSIT INT_3

GOODWILL AND CORE DEPOSIT INTANGIBLE ASSETS (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 576,005,000	$ 576,005,000
Goodwill impairment	$ 0

GOODWILL AND CORE DEPOSIT INT_4

GOODWILL AND CORE DEPOSIT INTANGIBLE ASSETS (Carrying amount of intangible assets (including accumulated amortization) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 101,185	$ 101,185
Accumulated Amortization	84,262	82,770
Net Carrying Amount	16,923	18,415
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,185	101,185
Accumulated Amortization	84,262	82,770
Net Carrying Amount	$ 16,923	$ 18,415

GOODWILL AND CORE DEPOSIT INT_5

GOODWILL AND CORE DEPOSIT INTANGIBLE ASSETS (Estimated future amortization expense for amortizable intangible assets) (Details) - Core Deposit Intangibles $ in Thousands	Mar. 31, 2024 USD ($)
Future amortization expense for amortizable intangible assets [Line Items]
Nine months ending December 31, 2024	$ 4,099
Year ending December 31,
2025	4,700
2026	3,533
2027	2,601
2028	1,287
2029	466
Thereafter	237
Total	$ 16,923

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Derivatives narrative) (Details) - Interest rate swap - Back-to-Back Loan Swaps - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Cash pledged as collateral	$ 590	$ 27,700
Counterparties
Derivative [Line Items]
Cash pledged as collateral	$ 93,600	$ 44,800

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS (Cash flow hedges narrative) (Details)	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2021 swap
Derivative [Line Items]
Estimated amount to be reclassified from accumulated other comprehensive income to interest expense	$ 982,000
Unaffiliated Bank
Derivative [Line Items]
Derivative, number of swaps | swap			1
Interest rate swap | Other assets
Derivative [Line Items]
Notional amount		$ 0
Interest rate swap | Cash Flow Hedges
Derivative [Line Items]
Derivative, notional amount	$ 500,000,000

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS (Gains (Losses) Recognized on Derivatives (Cash Flow Hedges)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Trading Activity, Gains and Losses, Net [Line Items]
Amount of Gain (Loss) Recognized in OCI	$ 0	$ 1,952
Amount of Gain (Loss) Reclassed from AOCI into Income	(34)	(764)
Derivative financial instruments
Trading Activity, Gains and Losses, Net [Line Items]
Amount of Gain (Loss) Recognized in OCI	0	1,952
Interest Income | Derivative financial instruments
Trading Activity, Gains and Losses, Net [Line Items]
Amount of Gain (Loss) Reclassed from AOCI into Income	$ (35)	$ 591

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS (Fair value hedges narrative) (Details) - Fair Value Hedging $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Interest Rate Swap, Conversion From Fixed To Floating Rates
Derivative [Line Items]
Derivative, notional amount, executed	$ 2,500
Interest Rate Swap, Protection For Unrealized Securities Losses
Derivative [Line Items]
Derivative, notional amount, executed	$ 838.1

DERIVATIVE FINANCIAL INSTRUME_7

DERIVATIVE FINANCIAL INSTRUMENTS (Fair value hedges balance sheet category and fair values) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Interest rate swaps-securities carried at fair value
Derivative [Line Items]
Fair Value Assets	$ 13,901	$ 5,027
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Fair Value Liabilities	$ 5,946	$ 27,554
Interest rate swaps-loans receivable held to maturity
Derivative [Line Items]
Fair Value Assets	$ 42,972	$ 23,182
Hedged Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets

DERIVATIVE FINANCIAL INSTRUME_8

DERIVATIVE FINANCIAL INSTRUMENTS (Carrying amount of hedged assets and fair value hedging adjustment) (Details) - Interest rate swap - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans receivable held to maturity
Derivative [Line Items]
Carrying Amount of the Hedged Assets	$ 2,494,674	$ 2,525,261
Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount of Hedged Assets	(5,885)	24,652
Securities carried at fair value
Derivative [Line Items]
Carrying Amount of the Hedged Assets	756,035	786,716
Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount of Hedged Assets	$ (40,827)	$ (20,979)

DERIVATIVE FINANCIAL INSTRUME_9

DERIVATIVE FINANCIAL INSTRUMENTS (Fair value hedges gains (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Interest and fees on loans	$ 195,661	$ 153,843
Taxable	47,014	55,976
Gain (loss) recognized in interest income and fees on loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in interest income and fees on loans	8	1
Gain (loss) recognized in interest income on securities-taxable
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in interest income and fees on loans	$ (303)	$ 0

DERIVATIVE FINANCIAL INSTRUM_10

DERIVATIVE FINANCIAL INSTRUMENTS (Effects of Fair Value Hedging) (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Loans Receivable
Derivative [Line Items]
Hedged item	$ (30,529)	$ 16
Derivatives designated as hedging instruments	30,537	$ (15)
Securities (Assets)
Derivative [Line Items]
Hedged item	(20,151)
Derivatives designated as hedging instruments	$ 19,848

DERIVATIVE FINANCIAL INSTRUM_11

DERIVATIVE FINANCIAL INSTRUMENTS (Embedded derivatives balance sheet category and fair values) (Details) - Embedded derivatives - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Amount	$ 2,344	$ 2,391
Fair Value	$ 70	$ 61
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets

DERIVATIVE FINANCIAL INSTRUM_12

DERIVATIVE FINANCIAL INSTRUMENTS (Embedded derivatives gain (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other noninterest income
Derivative [Line Items]
Gain (loss) recognized in other noninterest income on embedded derivatives	$ 9	$ (37)

DERIVATIVE FINANCIAL INSTRUM_13

DERIVATIVE FINANCIAL INSTRUMENTS (Back-to-back loan swaps narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Back-to-Back Loan Swaps
Derivative [Line Items]
Fee Income	$ 891	$ 2,000

DERIVATIVE FINANCIAL INSTRUM_14

DERIVATIVE FINANCIAL INSTRUMENTS (Back-to-back loan swaps balance sheet category and fair values) (Details) - Back-to-Back Loan Swaps - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Other assets
Derivative [Line Items]
Notional Amount	$ 1,744,314	$ 1,672,729
Fair Value	63,517	56,634
Other liabilities
Derivative [Line Items]
Notional Amount	1,744,314	1,672,729
Fair Value	$ (63,517)	$ (56,634)

DERIVATIVE FINANCIAL INSTRUM_15

DERIVATIVE FINANCIAL INSTRUMENTS (Other free standing derivatives balance sheet category and fair values) (Details) - Other liabilities - Undesignated interest rate swaps - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Notional Amount	$ 2,344	$ 2,391
Fair Value	$ (70)	$ (61)

DERIVATIVE FINANCIAL INSTRUM_16

DERIVATIVE FINANCIAL INSTRUMENTS (Other free standing derivatives gains (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest rate lock commitments (mortgage)
Trading Activity, Gains and Losses, Net [Line Items]
Gains (losses) recognized in income	$ 0	$ 410
Forward commitments
Trading Activity, Gains and Losses, Net [Line Items]
Gains (losses) recognized in income	0	272
Undesignated interest rate swaps
Trading Activity, Gains and Losses, Net [Line Items]
Gains (losses) recognized in income	$ 9	$ 37

FAIR VALUE (Narrative) (Details

FAIR VALUE (Narrative) (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Feb. 28, 2024 bank	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale	$ 16,064		$ 4,069
Loans held for sale	352,744		$ 5,071
Rocky Mountain Bank
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale	13,200
Loans held for sale	$ 352,700
Disposal group, number of bank branches | bank		9

FAIR VALUE (Fair value measurem

FAIR VALUE (Fair value measurement recurring) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Securities available for sale	$ 892,306
Equity securities with a readily determinable fair value	21,301	$ 21,056
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	32,222	32,118
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	4,386,000	4,614,773
Derivative instruments	120,460	84,904
Liabilities
Fair Value	69,533	84,249
Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Derivative instruments	0	0
Liabilities
Fair Value	0	0
U.S. treasuries
Assets
Securities available for sale	32,222	32,118
U.S. agencies
Assets
Securities available for sale	13,892	14,530
Obligations of states and political subdivisions
Assets
Securities available for sale	727,491	741,245
Commercial mortgage-backed securities - agency
Assets
Securities available for sale	64,074	64,788
Commercial mortgage-backed securities - non-agency
Assets
Securities available for sale	426,094	514,858
Asset-backed securities
Assets
Securities available for sale	197,108	217,370
Corporate bonds
Assets
Securities available for sale	118,701	118,169
Recurring Basis
Assets
Equity securities with a readily determinable fair value	21,301	21,056
Total assets at fair value	4,538,682	4,731,795
Liabilities
Total liabilities at fair value	69,533	84,249
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Equity securities with a readily determinable fair value	0	0
Total assets at fair value	32,222	32,118
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Significant Other Observable Inputs (Level 2)
Assets
Equity securities with a readily determinable fair value	21,301	21,056
Total assets at fair value	4,506,460	4,699,677
Liabilities
Total liabilities at fair value	69,533	84,249
Recurring Basis | Significant Unobservable Inputs (Level 3)
Assets
Equity securities with a readily determinable fair value	0	0
Total assets at fair value	0	0
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Derivative financial instruments
Assets
Derivative instruments	120,460	84,904
Liabilities
Fair Value	69,533	84,249
Recurring Basis | Derivative financial instruments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Recurring Basis | Derivative financial instruments | Significant Other Observable Inputs (Level 2)
Assets
Derivative instruments	120,460	84,904
Liabilities
Fair Value	69,533	84,249
Recurring Basis | Derivative financial instruments | Significant Unobservable Inputs (Level 3)
Assets
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Recurring Basis | U.S. treasuries
Assets
Securities available for sale	32,222	32,118
Recurring Basis | U.S. treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	32,222	32,118
Recurring Basis | U.S. treasuries | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	0	0
Recurring Basis | U.S. treasuries | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | U.S. agencies
Assets
Securities available for sale	13,892	14,530
Recurring Basis | U.S. agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | U.S. agencies | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	13,892	14,530
Recurring Basis | U.S. agencies | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Obligations of states and political subdivisions
Assets
Securities available for sale	727,491	741,245
Recurring Basis | Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	727,491	741,245
Recurring Basis | Obligations of states and political subdivisions | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - agency
Assets
Securities available for sale	1,359,541	1,393,629
Recurring Basis | Mortgage-backed securities - agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	1,359,541	1,393,629
Recurring Basis | Mortgage-backed securities - agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - non-agency
Assets
Securities available for sale	1,457,798	1,529,128
Recurring Basis | Mortgage-backed securities - non-agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - non-agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	1,457,798	1,529,128
Recurring Basis | Mortgage-backed securities - non-agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - agency
Assets
Securities available for sale	64,074	64,788
Recurring Basis | Commercial mortgage-backed securities - agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	64,074	64,788
Recurring Basis | Commercial mortgage-backed securities - agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - non-agency
Assets
Securities available for sale	426,094	514,858
Recurring Basis | Commercial mortgage-backed securities - non-agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - non-agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	426,094	514,858
Recurring Basis | Commercial mortgage-backed securities - non-agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Asset-backed securities
Assets
Securities available for sale	197,108	217,370
Recurring Basis | Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Asset-backed securities | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	197,108	217,370
Recurring Basis | Asset-backed securities | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Corporate bonds
Assets
Securities available for sale	118,701	118,169
Recurring Basis | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Corporate bonds | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	118,701	118,169
Recurring Basis | Corporate bonds | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	$ 0	$ 0

FAIR VALUE (Fair value measur_2

FAIR VALUE (Fair value measurement non-recurring) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 2,590	$ 12,548
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	352,744	5,071
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0	0
Significant Unobservable Inputs (Level 3) | Premises, furniture and equipment held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	16,064	16,064
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	58,414	59,973
Loans held for sale	352,744	5,071
Other real estate owned	2,590	12,548
Fair Value, Measurements, Nonrecurring | Premises, furniture and equipment held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	16,064	4,069
Fair Value, Measurements, Nonrecurring | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	5,863
Loans held for sale	0	0
Other real estate owned	539	2,967
Fair Value, Measurements, Nonrecurring | Year-to- Date (Gains) Losses | Premises, furniture and equipment held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	7	2,786
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Loans held for sale	0	0
Other real estate owned	0	0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Premises, furniture and equipment held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Loans held for sale	352,744	5,071
Other real estate owned	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Premises, furniture and equipment held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	0	0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	58,414	59,973
Loans held for sale	0	0
Other real estate owned	2,590	12,548
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Premises, furniture and equipment held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Premises, furniture and equipment held for sale	16,064	4,069
Fair Value, Measurements, Nonrecurring | Agricultural and agricultural real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	4,664	4,768
Fair Value, Measurements, Nonrecurring | Agricultural and agricultural real estate | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	5,309
Fair Value, Measurements, Nonrecurring | Agricultural and agricultural real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Agricultural and agricultural real estate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Agricultural and agricultural real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	4,664	4,768
Fair Value, Measurements, Nonrecurring | Residential real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	727	741
Fair Value, Measurements, Nonrecurring | Residential real estate | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Residential real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Residential real estate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Residential real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	727	741
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	22,292	23,422
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	554
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	22,292	23,422
Owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	30,089	30,400
Owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	30,089	30,400
Non-owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Non-owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Non-owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Non-owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Non-owner occupied commercial real estate | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Real Estate Construction | Fair Value, Measurements, Nonrecurring | Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	642	642
Real Estate Construction | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Year-to- Date (Gains) Losses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Real Estate Construction | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Real Estate Construction | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Real Estate Construction | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$ 642	$ 642

FAIR VALUE (Quantitative Inform

FAIR VALUE (Quantitative Information about Level 3 fair value measurements) (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	$ 2,590	$ 2,590
Loans receivable	58,414	59,973
Premises, furniture and equipment held for sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale	$ 16,064	$ 16,064
Appraisal discount | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned, measurement input (percent)	0	0
Appraisal discount | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned, measurement input (percent)	0.10	0.10
Appraisal discount | Premises, furniture and equipment held for sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale, measurement input (percent)	0%	0%
Appraisal discount | Premises, furniture and equipment held for sale | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale, measurement input (percent)	10%	10%
Commercial and industrial | Commercial and industrial
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	$ 22,292	$ 23,422
Commercial and industrial | Owner occupied commercial real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	30,089	30,400
Commercial and industrial | Non-owner occupied commercial real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	0	0
Commercial and industrial | Real Estate Construction
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	$ 642	$ 642
Commercial and industrial | Appraisal discount | Commercial and industrial | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	0%	0%
Commercial and industrial | Appraisal discount | Commercial and industrial | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	12%	12%
Commercial and industrial | Appraisal discount | Owner occupied commercial real estate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	0%	0%
Commercial and industrial | Appraisal discount | Owner occupied commercial real estate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	20%	20%
Commercial and industrial | Appraisal discount | Non-owner occupied commercial real estate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	0%	0%
Commercial and industrial | Appraisal discount | Non-owner occupied commercial real estate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	10%	10%
Commercial and industrial | Appraisal discount | Real Estate Construction | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	0%	0%
Commercial and industrial | Appraisal discount | Real Estate Construction | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	10%	10%
Agricultural and agricultural real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	$ 4,664	$ 4,768
Agricultural and agricultural real estate | Appraisal discount | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	0%	0%
Agricultural and agricultural real estate | Appraisal discount | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	10%	15%
Residential real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable	$ 727	$ 741
Residential real estate | Appraisal discount | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	0%	0%
Residential real estate | Appraisal discount | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input (percent)	10%	10%

FAIR VALUE (Estimated fair valu

FAIR VALUE (Estimated fair value financial instruments incl. carrying amounts) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities:
Carried at fair value	$ 892,306
Held to maturity	841,055	$ 838,241
Deposits held for sale	596,328	0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	444,366	323,013
Time deposits in other financial institutions	1,240	1,240
Securities:
Carried at fair value	32,222	32,118
Held to maturity	0	0
Other investments	0	0
Loans held for sale	0	0
Loans, net	0	0
Deposits held for sale	0
Cash surrender value on life insurance	0	0
Derivative instruments	0	0
Financial liabilities:
Borrowings	0	0
Term Debt	0	0
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Demand deposits
Financial liabilities:
Deposits	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Savings deposits
Financial liabilities:
Deposits	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Time deposits
Financial liabilities:
Deposits	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Time deposits in other financial institutions	0	0
Securities:
Carried at fair value	4,386,000	4,614,773
Held to maturity	813,752	816,399
Other investments	68,524	91,277
Loans held for sale	352,744	5,071
Loans, net	10,768,693	11,149,694
Deposits held for sale	631,274
Cash surrender value on life insurance	197,671	197,085
Derivative instruments	120,460	84,904
Financial liabilities:
Borrowings	650,033	622,255
Term Debt	374,240	374,017
Fair Value	69,533	84,249
Significant Other Observable Inputs (Level 2) | Demand deposits
Financial liabilities:
Deposits	4,264,390	4,500,304
Significant Other Observable Inputs (Level 2) | Savings deposits
Financial liabilities:
Deposits	8,669,221	8,805,597
Significant Other Observable Inputs (Level 2) | Time deposits
Financial liabilities:
Deposits	2,368,555	2,895,813
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Time deposits in other financial institutions	0	0
Securities:
Carried at fair value	0	0
Held to maturity	0	0
Other investments	0	0
Loans held for sale	0	0
Loans, net	58,414	59,973
Deposits held for sale	0
Cash surrender value on life insurance	0	0
Derivative instruments	0	0
Financial liabilities:
Borrowings	0	0
Term Debt	0	0
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Demand deposits
Financial liabilities:
Deposits	0	0
Significant Unobservable Inputs (Level 3) | Savings deposits
Financial liabilities:
Deposits	0	0
Significant Unobservable Inputs (Level 3) | Time deposits
Financial liabilities:
Deposits	0	0
Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial and industrial
Securities:
Loans, net	0	0
Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1) | Paycheck Protection Program ("PPP")
Securities:
Loans, net	0	0
Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1) | Owner occupied commercial real estate
Securities:
Loans, net	0	0
Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-owner occupied commercial real estate
Securities:
Loans, net	0	0
Commercial and industrial | Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate construction
Securities:
Loans, net	0	0
Commercial and industrial | Significant Other Observable Inputs (Level 2) | Commercial and industrial
Securities:
Loans, net	3,279,124	3,373,206
Commercial and industrial | Significant Other Observable Inputs (Level 2) | Paycheck Protection Program ("PPP")
Securities:
Loans, net	2,172	2,777
Commercial and industrial | Significant Other Observable Inputs (Level 2) | Owner occupied commercial real estate
Securities:
Loans, net	2,326,760	2,414,140
Commercial and industrial | Significant Other Observable Inputs (Level 2) | Non-owner occupied commercial real estate
Securities:
Loans, net	2,350,454	2,393,931
Commercial and industrial | Significant Other Observable Inputs (Level 2) | Real estate construction
Securities:
Loans, net	1,001,960	978,463
Commercial and industrial | Significant Unobservable Inputs (Level 3) | Commercial and industrial
Securities:
Loans, net	22,292	23,422
Commercial and industrial | Significant Unobservable Inputs (Level 3) | Paycheck Protection Program ("PPP")
Securities:
Loans, net	0	0
Commercial and industrial | Significant Unobservable Inputs (Level 3) | Owner occupied commercial real estate
Securities:
Loans, net	30,089	30,400
Commercial and industrial | Significant Unobservable Inputs (Level 3) | Non-owner occupied commercial real estate
Securities:
Loans, net	0	0
Commercial and industrial | Significant Unobservable Inputs (Level 3) | Real estate construction
Securities:
Loans, net	642	642
Agricultural and agricultural real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Agricultural and agricultural real estate | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	730,034	834,804
Agricultural and agricultural real estate | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	4,664	4,768
Residential real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Residential real estate | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	653,571	686,687
Residential real estate | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	727	741
Consumer | Quoted Prices in Active Markets for Identical Assets (Level 1)
Securities:
Loans, net	0	0
Consumer | Significant Other Observable Inputs (Level 2)
Securities:
Loans, net	424,618	465,686
Consumer | Significant Unobservable Inputs (Level 3)
Securities:
Loans, net	0	0
Carrying Amount
Financial assets:
Cash and cash equivalents	444,366	323,013
Time deposits in other financial institutions	1,240	1,240
Securities:
Carried at fair value	4,418,222	4,646,891
Held to maturity	841,055	838,241
Other investments	68,524	91,277
Loans held for sale	352,744	5,071
Loans, net	11,520,707	11,946,079
Deposits held for sale	596,328
Cash surrender value on life insurance	197,671	197,085
Derivative instruments	120,460	84,904
Financial liabilities:
Borrowings	650,033	622,255
Term Debt	372,652	372,396
Fair Value	69,533	84,249
Carrying Amount | Demand deposits
Financial liabilities:
Deposits	4,264,390	4,500,304
Carrying Amount | Savings deposits
Financial liabilities:
Deposits	8,669,221	8,805,597
Carrying Amount | Time deposits
Financial liabilities:
Deposits	2,368,555	2,895,813
Carrying Amount | Commercial and industrial | Commercial and industrial
Securities:
Loans, net	3,503,946	3,611,368
Carrying Amount | Commercial and industrial | Paycheck Protection Program ("PPP")
Securities:
Loans, net	2,172	2,777
Carrying Amount | Commercial and industrial | Owner occupied commercial real estate
Securities:
Loans, net	2,530,638	2,621,019
Carrying Amount | Commercial and industrial | Non-owner occupied commercial real estate
Securities:
Loans, net	2,479,298	2,536,462
Carrying Amount | Commercial and industrial | Real estate construction
Securities:
Loans, net	1,006,658	982,943
Carrying Amount | Agricultural and agricultural real estate
Securities:
Loans, net	804,768	914,892
Carrying Amount | Residential real estate
Securities:
Loans, net	750,866	791,984
Carrying Amount | Consumer
Securities:
Loans, net	442,361	484,634
Estimated Fair Value
Financial assets:
Cash and cash equivalents	444,366	323,013
Time deposits in other financial institutions	1,240	1,240
Securities:
Carried at fair value	4,418,222	4,646,891
Held to maturity	813,752	816,399
Other investments	68,524	91,277
Loans held for sale	352,744	5,071
Loans, net	10,827,107	11,209,667
Deposits held for sale	631,274
Cash surrender value on life insurance	197,671	197,085
Derivative instruments	120,460	84,904
Financial liabilities:
Borrowings	650,033	622,255
Term Debt	374,240	374,017
Fair Value	69,533	84,249
Estimated Fair Value | Demand deposits
Financial liabilities:
Deposits	4,264,390	4,500,304
Estimated Fair Value | Savings deposits
Financial liabilities:
Deposits	8,669,221	8,805,597
Estimated Fair Value | Time deposits
Financial liabilities:
Deposits	2,368,555	2,895,813
Estimated Fair Value | Commercial and industrial | Commercial and industrial
Securities:
Loans, net	3,301,416	3,396,628
Estimated Fair Value | Commercial and industrial | Paycheck Protection Program ("PPP")
Securities:
Loans, net	2,172	2,777
Estimated Fair Value | Commercial and industrial | Owner occupied commercial real estate
Securities:
Loans, net	2,356,849	2,444,540
Estimated Fair Value | Commercial and industrial | Non-owner occupied commercial real estate
Securities:
Loans, net	2,350,454	2,393,931
Estimated Fair Value | Commercial and industrial | Real estate construction
Securities:
Loans, net	1,002,602	979,105
Estimated Fair Value | Agricultural and agricultural real estate
Securities:
Loans, net	734,698	839,572
Estimated Fair Value | Residential real estate
Securities:
Loans, net	654,298	687,428
Estimated Fair Value | Consumer
Securities:
Loans, net	$ 424,618	$ 465,686

STOCK COMPENSATION (Narrative)

STOCK COMPENSATION (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)					1,460,000
Shares available for issuance (in shares)	474,721
Excess tax expense (benefit) related to share-based payment awards	$ 418	$ (46)
Options granted (in shares)	0	0
Options outstanding (in shares)	52,905	61,292	64,518	58,066
Time-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods (in years)	3 years
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods (in years)	3 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs	$ 3,600	$ 4,300
Share-based unrecognized compensation costs	$ 14,600
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods (in years)	4 years
Share-based compensation costs	$ 49	$ 69
Share-based unrecognized compensation costs	$ 381
Options granted (in shares)			64,518
Share-based compensation arrangement, contractual term	8 years 8 months 1 day
Share-based compensation arrangement, intrinsic value	$ 0
Intrinsic value of all options exercised	0
Fair value of shares under vested stock options and awards	$ 0

STOCK COMPENSATION (Summary of

STOCK COMPENSATION (Summary of RSUs Activity) (Details) - RSUs - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Shares
Outstanding at beginning of period (in shares)	466,105	424,086
Granted (in shares)	307,374	198,562
Vested (in shares)	(130,524)	(125,870)
Forfeited (in shares)	(32,624)	(21,338)
Outstanding at end of period (in shares)	610,331	475,440
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 47.22	$ 46.15
Granted (in dollars per share)	33.09	50.75
Vested (in dollars per share)	50.28	42.15
Forfeited (in dollars per share)	51.68	42.40
Outstanding at end of period (in dollars per share)	$ 39.21	$ 49.30

STOCK COMPENSATION (Summary o_2

STOCK COMPENSATION (Summary of Stock Options Activity) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Shares
Outstanding at beginning of period (in shares)	58,066	64,518
Options granted (in shares)	0	0
Exercised (in shares)	0	0
Forfeited (in shares)	(5,161)	(3,226)
Outstanding at end of period (in shares)	52,905	61,292
Options exercisable at end of period (in shares)	13,224	0
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 48.79	$ 48.79
Granted (in dollars per share)	0	0
Exercised (in dollars per share)	0	0
Forfeited (in dollars per share)	48.79	48.79
Outstanding at end of period (in dollars per share)	48.79	48.79
Options exercisable at end of period (in dollars per share)	$ 48.79	$ 0