Heartland Financial USA (HTLF) 10-Q 6 May 21 2020 Q2 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2021	May 04, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
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	1398 Central Avenue
Entity Address, City or Town	Dubuque
Entity Address, State or Province	IA
Entity Address, Postal Zip Code	52001
City Area Code	563
Local Phone Number	589-2100
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		42,176,282
Entity Central Index Key	0000920112
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock, par value $1.00 per share
Entity 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
Entity 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, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 198,177	$ 219,243
Interest bearing deposits with other banks and other short-term investments	269,685	118,660
Cash and cash equivalents	467,862	337,903
Time deposits in other financial institutions	3,138	3,129
Securities:
Carried at fair value (cost of $6,357,582 at March 31, 2021, and $6,024,225 at December 31, 2020)	6,370,495	6,127,975
Held to maturity, net of allowance for credit losses of $48 at March 31, 2021 and $51 at December 31, 2020 (fair value of $95,082 at March 31, 2021, and $100,041 at December 31, 2020)	85,293	88,839
Other investments, at cost	74,935	75,253
Loans held for sale	43,037	57,949
Loans receivable:
Held to maturity	10,050,456	10,023,051
Allowance for credit losses	(130,172)	(131,606)
Loans receivable, net	9,920,284	9,891,445
Premises, furniture and equipment, net	217,414	219,595
Premises, furniture and equipment held for sale	7,633	6,499
Other real estate, net	6,236	6,624
Goodwill	576,005	576,005
Core deposit intangibles and customer relationship intangibles, net	39,867	42,383
Servicing rights, net	6,953	6,052
Cash surrender value on life insurance	188,521	187,664
Other assets	236,754	281,024
TOTAL ASSETS	18,244,427	17,908,339
Deposits:
Demand	6,175,946	5,688,810
Savings	8,179,251	8,019,704
Time	1,203,854	1,271,391
Total deposits	15,559,051	14,979,905
Short-term borrowings	140,597	167,872
Other borrowings	349,514	457,042
Accrued expenses and other liabilities	139,058	224,289
TOTAL LIABILITIES	16,188,220	15,829,108
STOCKHOLDERS' EQUITY:
Common stock (par value $1 per share; 60,000,000 shares authorized at both March 31, 2021, and December 31, 2020; issued 42,173,675 shares at March 31, 2021, and 42,093,862 shares at December 31, 2020)	42,174	42,094
Capital surplus	1,063,497	1,062,083
Retained earnings	833,171	791,630
Accumulated other comprehensive income	6,660	72,719
TOTAL STOCKHOLDERS' EQUITY	2,056,207	2,079,231
TOTAL LIABILITIES AND EQUITY	18,244,427	17,908,339
Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 0	$ 0
Preferred stock, shares authorized (in shares)	6,104	6,104
Series A Junior Participating preferred stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 0	$ 0
Preferred stock, shares authorized (in shares)	16,000	16,000
Series B Fixed Rate Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 0	$ 0
Preferred stock, shares authorized (in shares)	81,698	81,698
Series C Senior Non-Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 0	$ 0
Preferred stock, shares authorized (in shares)	81,698	81,698
Series D Senior Non-Cumulative Perpetual Convertible Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 0	$ 0
Preferred stock, shares authorized (in shares)	3,000	3,000
Series E Fixed-Rate Reset Cumulative Perpetual Preferred Stock
STOCKHOLDERS' EQUITY:
Preferred stock	$ 110,705	$ 110,705
Preferred stock, shares authorized (in shares)	11,500	11,500

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Securities carried at fair value, cost	$ 6,357,582	$ 6,024,225
Held to maturity, allowance for credit losses	48	51
Estimated Fair Value	$ 95,082	$ 100,041
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)	42,173,675	42,093,862
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	6,104	6,104
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series A Junior Participating preferred stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	16,000	16,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series B Fixed Rate Cumulative Perpetual Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	81,698	81,698
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series C Senior Non-Cumulative Perpetual Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	81,698	81,698
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series D Senior Non-Cumulative Perpetual Convertible Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	3,000	3,000
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
Obligations of states and political subdivisions
Held to maturity, allowance for credit losses	$ 48	$ 51
Estimated Fair Value	$ 95,082	$ 100,041

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST INCOME:
Interest and fees on loans	$ 112,439	$ 106,414
Interest on securities:
Taxable	30,443	21,731
Nontaxable	4,503	2,183
Interest on federal funds sold	1	0
Interest on interest bearing deposits in other financial institutions	66	721
TOTAL INTEREST INCOME	147,452	131,049
INTEREST EXPENSE:
Interest on deposits	4,395	14,582
Interest on short-term borrowings	152	296
Interest on other borrowings (includes $(591) and $(183) of interest benefit related to derivatives reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020, respectively)	3,300	3,660
TOTAL INTEREST EXPENSE	7,847	18,538
NET INTEREST INCOME	139,605	112,511
Provision (benefit) for credit losses	(648)	21,520
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	140,253	90,991
NONINTEREST INCOME:
Revenue from contract with customers	20,301	17,776
Loan servicing income	838	963
Securities gains (losses), net (includes $(30) and $1,658 of net security gains (losses) reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020, respectively)	(30)	1,658
Unrealized loss on equity securities, net	(110)	(231)
Net gains on sale of loans held for sale	6,420	4,660
Valuation adjustment on servicing rights	917	(1,565)
Income on bank owned life insurance	829	498
Other noninterest income	1,152	2,058
TOTAL NONINTEREST INCOME	30,317	25,817
NONINTEREST EXPENSES:
Salaries and employee benefits	59,062	49,957
Occupancy	7,918	6,471
Furniture and equipment	3,093	3,108
Professional fees	13,490	12,473
Advertising	1,469	2,205
Core deposit intangibles and customer relationship intangibles amortization	2,516	2,981
Other real estate and loan collection expenses	135	334
Loss on sales/valuations of assets, net	194	16
Acquisition, integration and restructuring costs	2,928	1,376
Partnership investment in tax credit projects	35	184
Other noninterest expenses	11,583	11,754
TOTAL NONINTEREST EXPENSES	102,423	90,859
INCOME BEFORE INCOME TAXES	68,147	25,949
Income taxes (includes $143 and $466 of income tax expense reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020, respectively)	15,333	5,909
NET INCOME	52,814	20,040
Preferred dividends	(2,013)	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 50,801	$ 20,040
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 1.20	$ 0.54
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	1.20	0.54
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.22	$ 0.20
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 13,671	$ 12,021
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	5,777	5,022
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 853	$ 733

CONSOLIDATED STATEMENTS OF IN_2

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest expense	$ 3,300	$ 3,660
Gain (loss) on securities	(30)	1,658
Income tax expense (benefit)	15,333	5,909
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Derivatives
Interest expense	(591)	(183)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Gain (loss) on securities	(30)	1,658
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income (Loss)
Income tax expense (benefit)	$ 143	$ 466

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 52,814	$ 20,040
Securities:
Net change in unrealized gain on securities	(90,869)	(28,328)
Reclassification adjustment for net gains/(losses) realized in net income	30	(1,658)
Income taxes	23,761	7,797
Other comprehensive loss on securities	(67,078)	(22,189)
Derivatives used in cash flow hedging relationships:
Net change in unrealized gain/(loss) on derivatives	1,888	(3,680)
Reclassification adjustment for net gains on derivatives realized in net income	(597)	(190)
Income taxes	(272)	814
Other comprehensive income (loss) on cash flow hedges	1,019	(3,056)
Other comprehensive loss	(66,059)	(25,245)
TOTAL COMPREHENSIVE LOSS	$ (13,245)	$ (5,205)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 52,814	$ 20,040
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,801	7,100
Provision (benefit) for credit losses	(648)	21,520
Net amortization of premium on securities	8,991	3,685
Securities (gains)/losses, net	30	(1,658)
Unrealized loss on equity securities, net	110	231
Stock based compensation	2,760	2,222
Loans originated for sale	(124,380)	(91,974)
Proceeds on sales of loans held for sale	145,200	100,425
Net gains on sale of loans held for sale	(5,908)	(4,660)
(Increase) decrease in accrued interest receivable	26	(667)
Increase in prepaid expenses	(578)	(157)
Increase in accrued interest payable	236	316
Capitalization of servicing rights	(512)	(414)
Valuation adjustment on servicing rights	(917)	1,565
Loss on sales/valuations of assets, net	194	16
Net excess tax benefit (expense) from stock based compensation	153	(25)
Other, net	(17,816)	(40,513)
NET CASH PROVIDED BY OPERATING ACTIVITIES	66,556	17,052
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of time deposits in other financial institutions	(9)	(4)
Proceeds from the sale of securities available for sale	207,067	328,890
Proceeds from the maturity of and principal paydowns on securities available for sale	159,773	92,413
Proceeds from the maturity of and principal paydowns on securities held to maturity	3,909	55
Proceeds from the maturity of time deposits in other financial institutions	0	150
Proceeds from the sale, maturity of and principal paydowns on other investments	1,003	5,613
Purchase of securities available for sale	(709,690)	(627,246)
Purchase of other investments	(685)	(9,662)
Net increase in loans	(29,674)	(5,568)
Purchase of bank owned life insurance policies	(22)	(39)
Capital expenditures	(3,776)	(3,723)
Proceeds from the sale of equipment	1,311	0
Proceeds on sale of OREO and other repossessed assets	1,209	1,019
NET CASH USED BY INVESTING ACTIVITIES	(369,584)	(218,102)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand deposits	487,136	153,111
Net increase in savings deposits	159,547	59,185
Net decrease in time deposit accounts	(67,537)	(82,602)
Net decrease in short-term borrowings	(27,275)	(34,987)
Proceeds from short term advances	0	491,545
Repayments of short term advances	0	(517,742)
Proceeds from other borrowings	0	1,930
Repayments of other borrowings	(107,807)	(1,832)
Proceeds from issuance of common stock	196	804
Dividends paid	(11,273)	(7,353)
NET CASH PROVIDED BY FINANCING ACTIVITIES	432,987	62,059
Net increase (decrease) in cash and cash equivalents	129,959	(138,991)
Cash and cash equivalents at beginning of year	337,903	378,734	$ 378,734
CASH AND CASH EQUIVALENTS AT END OF PERIOD	467,862	239,743	$ 337,903
Supplemental disclosures:
Cash paid for income/franchise taxes	15,744	12
Cash paid for interest	7,611	18,222
Loans transferred to OREO	585	245
Transfer of premises from premises, furniture and equipment, net, to premises, furniture and equipment held for sale	1,140	0
Transfer of premises from premises, furniture and equipment held for sale to premises, furniture and equipment, net	6	0
Dividends declared, not paid	2,013	0
Purchases of securities available for sale, accrued, not settled	0	14,035
Transfer of available for sale securities to held to maturity securities	$ 0	$ 462

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred Stock	Preferred StockCumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common StockCumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus	Capital SurplusCumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjusted Balance
Balance at beginning of period at Dec. 31, 2019	$ 1,578,137	$ (14,891)	$ 1,563,246	$ 0	$ 0	$ 36,704	$ 36,704	$ 839,857	$ 839,857	$ 702,502	$ (14,891)	$ 687,611	$ (926)	$ (926)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	(5,205)									20,040			(25,245)
Cash dividends declared:
Common	(7,353)									(7,353)
Issuance of shares of common stock	804					103		701
Stock based compensation	2,222							2,222
Balance at end of period at Mar. 31, 2020	1,553,714			0		36,807		842,780		700,298			(26,171)
Balance at beginning of period at Dec. 31, 2020	2,079,231			110,705		42,094		1,062,083		791,630			72,719
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	(13,245)									52,814			(66,059)
Cash dividends declared:
Preferred	(2,013)									(2,013)
Common	(9,260)									(9,260)
Issuance of shares of common stock	(1,266)					80		(1,346)
Stock based compensation	2,760							2,760
Balance at end of period at Mar. 31, 2021	$ 2,056,207			$ 110,705		$ 42,174		$ 1,063,497		$ 833,171			$ 6,660

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201602Member
Cash dividends per share preferred stock (in dollars per share)	$ 175
Cash dividends per share common stock (in dollars per share)	$ 0.22	$ 0.20
Shares of common stock issued (in shares)	79,813	102,939

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2021
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, 2020, included in the Form 10-K of Heartland Financial USA, Inc. ("HTLF") filed with the Securities and Exchange Commission ("SEC") on February 25, 2021 . 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, 2021, are not necessarily indicative of the results expected for the year ending December 31, 2021. 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, 2021, and 2020, are shown in the table below: Three Months Ended (Dollars and number of shares in thousands, except per share data) 2021 2020 Net income $ 52,814 $ 20,040 Preferred dividends (2,013) — Net income available to stockholders $ 50,801 $ 20,040 Weighted average common shares outstanding for basic earnings per share 42,174 36,821 Assumed incremental common shares issued upon vesting of outstanding restricted stock units 162 75 Weighted average common shares for diluted earnings per share 42,336 36,896 Earnings per common share — basic $ 1.20 $ 0.54 Earnings per common share — diluted $ 1.20 $ 0.54 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation 25 — 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. Effect of New Financial Accounting Standards ASU 2018-16 In October 2018, the FASB issued ASU 2018-16, " Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting." In the United States, eligible benchmark interest rates under Topic 815 are interest rates on direct Treasury obligations of the U.S. government, the London Interbank Offered Rate ("LIBOR") swap rate, and the Overnight Index Swap ("OIS") Rate based on the Fed Funds Effective Rate. When the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities , in August 2017, it introduced the Securities Industry and Financial Markets Association ("SIFMA") Municipal Swap Rate as the fourth permissible U.S. benchmark rate. ASU 2018-16 adds the OIS rate based on the Secured Overnight Financing Rate ("SOFR") as a U.S. benchmark interest rate to facilitate the LIBOR to SOFR transition and provide sufficient lead time for entities to prepare for changes to interest rate risk hedging strategies for both risk management and hedge accounting purposes. ASU 2018-16 became effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years and the financial statement impact immediately upon adoption was immaterial. The future financial statement impact will depend on any new contracts entered into using new benchmark rates, as well as any existing contracts that are migrated from LIBOR to new benchmark interest rates. HTLF has a formal working group that is currently evaluating the impact of the transition from LIBOR as an interest rate benchmark to other potential alternative reference rates, including but not limited to the SOFR. Currently, HTLF has adjustable rate loans, several debt obligations and securities and derivative instruments in place that reference LIBOR-based rates. The transition from LIBOR is expected to take place at the end of 2021, and management will continue to actively assess the related opportunities and risks involved in this transition. ASU 2019-12 In December 2019, the FASB issued ASU 2019-12, "Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes." ASU 2019-12 simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in ASC 740 related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition for deferred tax liabilities for outside basis differences. ASU 2019-12 also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. HTLF adopted this ASU on January 1, 2021, as required, and the adoption did not have a material impact on its results of operations, financial position and liquidity. ASU 2020-04 In March 2020, the FASB issued ASU 2020-04, " Reference Rate Reform, " which provides optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. For loan and lease agreements that are modified because of reference rate reform and that meet certain scope guidance (i) modifications of loan agreements should be accounted for by prospectively adjusting the effective interest rate, and the modifications would be considered "minor" with the result that any existing unamortized origination fees/costs would carry forward and continue to be amortized and (ii) modifications of lease agreements should be accounted for as a continuation of the existing agreement, with no reassessments of the lease classification and the discount rate or remeasurements of lease payments that otherwise would be required for modifications not accounted for as separate contracts. ASU 2020-04 also provides numerous optional expedients for derivative accounting. ASU 2020-04 is effective March 12, 2020 through December 31, 2022. An entity may elect to apply ASU 2020-04 for contract modifications as of January 1, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic within the ASC, ASU 2020-04 must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. HTLF anticipates that ASU 2020-04 will simplify any modifications executed between the selected start date and December 31, 2022 that are directly related to LIBOR transition by allowing prospective recognition of the continuation of the contract, rather than extinguishment of the old contract that would result in writing off unamortized fees/costs. Management will continue to actively assess the impacts of ASU 2020-04 and the related opportunities and risks involved in the LIBOR transition.

ACQUISITIONS

ACQUISITIONS	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS Johnson Bank branches On December 4, 2020, Arizona Bank & Trust ("AB&T"), a wholly-owned subsidiary headquartered in Phoenix, Arizona, completed its acquisition of certain assets and assumed substantially all of the deposits and certain other liabilities of Johnson Bank's Arizona operations, which includes four banking centers. Johnson Bank is a wholly-owned subsidiary of Johnson Financial Group, Inc., headquartered in Racine, Wisconsin. As of the closing date, AB&T acquired, at fair value, total assets of $419.7 million, which included gross loans of $150.7 million and assumed deposits of $415.5 million and certain other liabilities. AIM Bancshares, Inc. On December 4, 2020, HTLF completed the acquisition of AIM Bancshares, Inc. ("AIM") and its wholly-owned subsidiary, AimBank, headquartered in Levelland, Texas. Pursuant to the agreement, each share of AimBank common stock was converted into the right to receive 207.0 shares of HTLF common stock and $1,887.16 of cash, subject to certain hold-back provisions of the agreement. Based on the closing price of $41.89 per share of HTLF common stock on December 4, 2020, the aggregate merger consideration received by AimBank stockholders was valued at approximately $264.5 million, which was paid by delivery of HTLF common stock valued at $217.2 million and cash of subject to certain hold-back provisions of the agreement. In addition, holders of in-the-money options to acquire shares of AimBank common stock received aggregate consideration of approximately $4.9 million in exchange for the cancellation of such stock options. The combined entity, resulting from the merger of AimBank into First Bank & Trust, will operate as First Bank & Trust. The transaction included, at fair value, total assets of $1.97 billion, including $1.09 billion of gross loans held to maturity, and $1.67 billion of deposits. The transaction is

SECURITIES

SECURITIES	3 Months Ended
	Mar. 31, 2021
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, 2021, and December 31, 2020, are summarized in the table below, in thousands: Amortized Gross Gross Estimated March 31, 2021 U.S. treasuries $ 995 $ 24 $ — $ 1,019 U.S. agencies 212,805 1,222 (1,735) 212,292 Obligations of states and political subdivisions 1,737,638 41,460 (41,109) 1,737,989 Mortgage-backed securities - agency 1,442,422 19,675 (29,168) 1,432,929 Mortgage-backed securities - non-agency 1,490,868 14,957 (2,109) 1,503,716 Commercial mortgage-backed securities - agency 123,797 2,150 (3,717) 122,230 Commercial mortgage-backed securities - non-agency 307,744 272 (242) 307,774 Asset-backed securities 1,017,016 12,837 (1,640) 1,028,213 Corporate bonds 3,754 64 (28) 3,790 Total debt securities 6,337,039 92,661 (79,748) 6,349,952 Equity securities with a readily determinable fair value 20,543 — — 20,543 Total $ 6,357,582 $ 92,661 $ (79,748) $ 6,370,495 December 31, 2020 U.S. treasuries $ 1,995 $ 31 $ — $ 2,026 U.S. agencies 167,048 657 (926) 166,779 Obligations of states and political subdivisions 1,562,631 75,555 (2,959) 1,635,227 Mortgage-backed securities - agency 1,351,964 16,029 (12,723) 1,355,270 Mortgage-backed securities - non-agency 1,428,068 22,688 (1,640) 1,449,116 Commercial mortgage-backed securities - agency 171,451 3,440 (738) 174,153 Commercial mortgage-backed securities - non-agency 253,421 37 (691) 252,767 Asset-backed securities 1,064,255 9,421 (4,410) 1,069,266 Corporate bonds 3,763 8 (29) 3,742 Total debt securities 6,004,596 127,866 (24,116) 6,108,346 Equity securities with a readily determinable fair value 19,629 — — 19,629 Total $ 6,024,225 $ 127,866 $ (24,116) $ 6,127,975 The amortized cost, gross unrealized gains and losses and estimated fair values of held to maturity securities as of March 31, 2021, and December 31, 2020, are summarized in the table below, in thousands: Amortized Gross Gross Estimated Allowance for Credit Losses March 31, 2021 Obligations of states and political subdivisions $ 85,341 $ 9,741 $ — $ 95,082 $ (48) Total $ 85,341 $ 9,741 $ — $ 95,082 $ (48) December 31, 2020 Obligations of states and political subdivisions $ 88,890 $ 11,151 $ — $ 100,041 $ (51) Total $ 88,890 $ 11,151 $ — $ 100,041 $ (51) As of March 31, 2021, HTLF had $21.4 million of accrued interest receivable, which is included in other assets on the consolidated balance sheet. 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, 2021, 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, 2021 Amortized Cost Estimated Fair Value Due in 1 year or less $ 2,839 $ 2,873 Due in 1 to 5 years 30,793 31,575 Due in 5 to 10 years 250,514 250,981 Due after 10 years 1,671,046 1,669,661 Total debt securities 1,955,192 1,955,090 Mortgage and asset-backed securities 4,381,847 4,394,862 Equity securities with a readily determinable fair value 20,543 20,543 Total investment securities $ 6,357,582 $ 6,370,495 The amortized cost and estimated fair value of debt securities held to maturity at March 31, 2021, 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, 2021 Amortized Cost Estimated Fair Value Due in 1 year or less $ 2,008 $ 2,028 Due in 1 to 5 years 23,461 25,067 Due in 5 to 10 years 51,288 56,258 Due after 10 years 8,584 11,729 Total debt securities 85,341 95,082 Allowance for credit losses (48) — Total investment securities $ 85,293 $ 95,082 As of March 31, 2021, and December 31, 2020, securities with a carrying value of $1.78 billion and $2.12 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, 2021 and 2020, are summarized as follows, in thousands: Three Months Ended 2021 2020 Proceeds from sales $ 207,067 $ 328,890 Gross security gains 445 2,904 Gross security losses 475 1,246 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, 2021, and December 31, 2020. 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, 2020, and December 31, 2019 , 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, 2021 U.S. treasuries $ — $ — — $ — $ — — $ — $ — — U.S. agencies 23,581 (997) 2 95,757 (738) 73 119,338 (1,735) 75 Obligations of states and political subdivisions 1,000,647 (40,997) 169 13,126 (112) 2 1,013,773 (41,109) 171 Mortgage-backed securities - agency 774,060 (28,762) 51 27,063 (406) 2 801,123 (29,168) 53 Mortgage-backed securities - non-agency 568,107 (1,801) 18 30,172 (308) 5 598,279 (2,109) 23 Commercial mortgage-backed securities - agency 72,262 (3,717) 11 — — — 72,262 (3,717) 11 Commercial mortgage-backed securities - non-agency 57,789 (6) 1 34,659 (236) 4 92,448 (242) 5 Asset-backed securities 128,354 (533) 6 88,892 (1,107) 12 217,246 (1,640) 18 Corporate bonds 1,714 (28) 4 — — — 1,714 (28) 4 Total temporarily impaired securities $ 2,626,514 $ (76,841) 262 $ 289,669 $ (2,907) 98 $ 2,916,183 $ (79,748) 360 December 31, 2020 U.S. treasuries $ — $ — — $ — $ — — $ — $ — — U.S. agencies 2,981 (8) 5 99,922 (918) 72 102,903 (926) 77 Obligations of states and political subdivisions 346,598 (2,959) 49 — — — 346,598 (2,959) 49 Mortgage-backed securities - agency 653,793 (12,342) 35 31,012 (381) 3 684,805 (12,723) 38 Mortgage-backed securities - non-agency 378,843 (1,639) 17 1,622 (1) 1 380,465 (1,640) 18 Commercial mortgage-backed securities - agency 46,541 (738) 6 — — — 46,541 (738) 6 Commercial mortgage-backed securities - non-agency 100,042 (15) 2 35,428 (676) 3 135,470 (691) 5 Asset-backed securities 141,824 (643) 9 340,452 (3,767) 24 482,276 (4,410) 33 Corporate bonds 1,908 (29) 4 — — — 1,908 (29) 4 Total temporarily impaired securities $ 1,672,530 $ (18,373) 127 $ 508,436 $ (5,743) 103 $ 2,180,966 $ (24,116) 230 HTLF had no securities held to maturity with unrealized losses at March 31, 2021, or December 31, 2020. HTLF reviews the investment securities portfolio at the security level on a quarterly basis for potential credit losses, which takes 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, as well as security and industry specific economic conditions. In addition, 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 remaining unrealized losses on HTLF's mortgage and asset-backed securities are the result of changes in market interest rates or widening of market spreads subsequent to the initial 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 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, 2021 and 2020. The unrealized losses on HTLF's obligations of states and political subdivisions 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 decline in fair value is attributable to changes in interest rates or widening market spreads due to insurance company downgrades and not underlying credit quality, and because 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, 2021 and 2020. The credit loss model under ASC 326-30, applicable to held to maturity debt securities, requires the recognition of lifetime expected credit losses through an allowance account at the time when the security is purchased. The following table presents, in thousands, the activity in the allowance for credit losses for securities held to maturity by obligations of states and political subdivisions securities for the three months ended March 31, 2021 and 2020: Three Months Ended 2021 2020 Beginning balance $ 51 $ — Impact of ASU 2016-13 adoption — 158 Adjusted balance 51 158 Provision (benefit) for credit losses (3) 39 Balance at period end $ 48 $ 197 The following table summarizes, in thousands, the carrying amount of HTLF's held to maturity debt securities by investment rating as of March 31, 2021 and 2020, which are updated quarterly and used to monitor the credit quality of the securities: March 31, 2021 December 31, 2020 Rating AAA $ 3,178 $ — AA, AA+, AA- 61,816 64,385 A+, A, A- 15,150 18,353 BBB 4,729 4,208 Not Rated 468 1,944 Total $ 85,341 $ 88,890 Included in other securities were shares of stock in each Federal Home Loan Bank (the "FHLB") of Des Moines, Chicago, Dallas, San Francisco and Topeka at an amortized cost of $19.2 million at March 31, 2021 and $19.5 million at December 31, 2020. The HTLF banks are required by federal law to maintain FHLB stock as members of the various FHLBs. 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, 2021, did not consider the investments to be impaired.

LOANS

LOANS	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
LOANS	LOANS Loans as of March 31, 2021, and December 31, 2020, were as follows, in thousands: March 31, 2021 December 31, 2020 Loans receivable held to maturity: Commercial and industrial $ 2,421,260 $ 2,534,799 Paycheck Protection Program ("PPP") 1,155,328 957,785 Owner occupied commercial real estate 1,837,559 1,776,406 Non-owner occupied commercial real estate 1,967,183 1,921,481 Real estate construction 796,027 863,220 Agricultural and agricultural real estate 683,969 714,526 Residential real estate 786,994 840,442 Consumer 402,136 414,392 Total loans receivable held to maturity 10,050,456 10,023,051 Allowance for credit losses (130,172) (131,606) Loans receivable, net $ 9,920,284 $ 9,891,445 As of March 31, 2021, HTLF had $41.6 million of accrued interest receivable, which is included in other assets on the consolidated balance sheet. 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, 2021, and December 31, 2020, and the related loan balances, disaggregated on the basis of measurement methodology, in thousands. Individually assessed loans are collateral dependent and in the process of foreclosure or no longer share the same risk characteristics of the other loans in the pool. 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, 2021 Commercial and industrial $ 3,433 $ 32,662 $ 36,095 $ 14,560 $ 2,406,700 $ 2,421,260 PPP — — — — 1,155,328 1,155,328 Owner occupied commercial real estate 110 19,306 19,416 10,720 1,826,839 1,837,559 Non-owner occupied commercial real estate 5,873 18,821 24,694 22,655 1,944,528 1,967,183 Real estate construction — 19,931 19,931 — 796,027 796,027 Agricultural and agricultural real estate 2,481 4,630 7,111 14,926 669,043 683,969 Residential real estate — 11,012 11,012 129 786,865 786,994 Consumer — 11,913 11,913 — 402,136 402,136 Total $ 11,897 $ 118,275 $ 130,172 $ 62,990 $ 9,987,466 $ 10,050,456 December 31, 2020 Commercial and industrial $ 4,077 $ 34,741 $ 38,818 $ 16,578 $ 2,518,221 $ 2,534,799 PPP — — — — 957,785 957,785 Owner occupied commercial real estate 111 19,890 20,001 11,174 1,765,232 1,776,406 Non-owner occupied commercial real estate 3,250 17,623 20,873 13,490 1,907,991 1,921,481 Real estate construction — 20,080 20,080 — 863,220 863,220 Agricultural and agricultural real estate 1,988 5,141 7,129 15,453 699,073 714,526 Residential real estate — 11,935 11,935 535 839,907 840,442 Consumer — 12,770 12,770 — 414,392 414,392 Total $ 9,426 $ 122,180 $ 131,606 $ 57,230 $ 9,965,821 $ 10,023,051 HTLF had $6.1 million of troubled debt restructured loans at March 31, 2021, of which $3.7 million were classified as nonaccrual and $2.4 million were accruing according to the restructured terms. HTLF had $6.2 million of troubled debt restructured loans at December 31, 2020, of which $3.8 million were classified as nonaccrual and $2.4 million were accruing according to the restructured terms. The following tables provide information on troubled debt restructured loans that were modified during the three months ended March 31, 2021, and March 31, 2020, dollars in thousands: Three Months Ended Three Months Ended 2021 2020 Number Pre- Post- Number Pre- Post- Commercial and industrial — $ — $ — — $ — $ — PPP — — — — — — Owner occupied commercial real estate — — — — — — Non-owner occupied commercial real estate — — — — — — Real estate construction — — — — — — Agricultural and agricultural real estate — — — — — — Residential real estate — — — 1 32 32 Consumer — — — — — — Total — $ — $ — 1 $ 32 $ 32 At March 31, 2021, there were no commitments to extend credit to any of the borrowers with an existing troubled debt restructured loan. The tables above do not include any loan modifications made under COVID-19 modification programs. Refer to the "Overview" section of Item 2, "Management's Discussion and Analysis of Financial Condition and Results of Operations," for further information on these modifications. The following table shows troubled debt restructured loans for which there was a payment default during the three months ended March 31, 2021, and March 31, 2020, that had been modified during the twelve-month period prior to default, in thousands: With Payment Defaults During the Three Months Ended March 31, 2021 2020 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial and industrial — $ — — $ — PPP — — — — Owner occupied commercial real estate — — — — Non-owner occupied commercial real estate — — — — Real estate construction — — — — Agricultural and agricultural real estate — — — — Residential real estate — — 1 241 Consumer — — — — Total — $ — 1 $ 241 HTLF's internal rating system is a series of grades reflecting management's 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 categorized into 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. The "nonpass" category consists of watch, substandard, doubtful and loss 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, lack of 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 the loan 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 and capital, as well as 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, 2021 and December 31, 2020. The following tables show the risk category of loans by loan category and year of origination as of March 31, 2021, and December 31, 2020, in thousands: As of March 31, 2021 Amortized Cost Basis of Term Loans by Year of Origination 2021 2020 2019 2018 2017 2016 and Prior Revolving Total Commercial and industrial Pass $ 85,059 $ 523,968 $ 305,803 $ 142,927 $ 206,293 $ 386,530 $ 481,837 $ 2,132,417 Watch 1,213 31,058 23,144 19,494 15,308 21,877 78,657 190,751 Substandard 825 24,203 10,191 8,278 11,890 26,002 16,703 98,092 Commercial and industrial total $ 87,097 $ 579,229 $ 339,138 $ 170,699 $ 233,491 $ 434,409 $ 577,197 $ 2,421,260 PPP Pass $ 400,126 $ 671,099 $ — $ — $ — $ — $ — $ 1,071,225 Watch 9,625 20,344 — — — — — 29,969 Substandard 5,750 48,384 — — — — — 54,134 PPP total $ 415,501 $ 739,827 $ — $ — $ — $ — $ — $ 1,155,328 Owner occupied commercial real estate Pass $ 97,898 $ 415,729 $ 387,953 $ 271,720 $ 152,313 $ 289,744 $ 36,676 $ 1,652,033 Watch 768 16,775 22,063 22,059 20,427 19,212 7,131 108,435 Substandard 1,907 14,332 7,797 10,340 12,830 28,937 948 77,091 Owner occupied commercial real estate total $ 100,573 $ 446,836 $ 417,813 $ 304,119 $ 185,570 $ 337,893 $ 44,755 $ 1,837,559 Non-owner occupied commercial real estate Pass $ 94,856 $ 334,303 $ 379,230 $ 297,195 $ 181,937 $ 307,473 $ 20,154 $ 1,615,148 Watch — 20,932 91,095 31,107 20,494 67,914 5,013 236,555 Substandard 2,140 30,469 14,010 23,383 14,853 30,625 — 115,480 Non-owner occupied commercial real estate total $ 96,996 $ 385,704 $ 484,335 $ 351,685 $ 217,284 $ 406,012 $ 25,167 $ 1,967,183 Real estate construction Pass $ 66,643 $ 342,374 $ 229,345 $ 54,006 $ 10,730 $ 9,485 $ 18,588 $ 731,171 Watch — 2,832 11,164 47,532 317 25 414 62,284 Substandard 158 — 28 1,995 — 391 — 2,572 Real estate construction total $ 66,801 $ 345,206 $ 240,537 $ 103,533 $ 11,047 $ 9,901 $ 19,002 $ 796,027 Agricultural and agricultural real estate Pass $ 56,474 $ 149,863 $ 81,301 $ 49,483 $ 32,928 $ 49,165 $ 132,606 $ 551,820 Watch 1,268 17,561 12,753 6,863 1,636 6,667 10,136 56,884 Substandard 6,686 13,163 6,943 22,012 5,855 12,370 8,236 75,265 Agricultural and agricultural real estate total $ 64,428 $ 180,587 $ 100,997 $ 78,358 $ 40,419 $ 68,202 $ 150,978 $ 683,969 Residential real estate Pass $ 46,700 $ 125,274 $ 80,624 $ 95,884 $ 64,961 $ 312,167 $ 26,634 $ 752,244 Watch 1,188 1,989 1,676 2,067 1,620 8,062 — 16,602 Substandard 4,324 947 201 2,073 1,410 8,393 800 18,148 Residential real estate total $ 52,212 $ 128,210 $ 82,501 $ 100,024 $ 67,991 $ 328,622 $ 27,434 $ 786,994 Consumer Pass $ 17,483 $ 32,613 $ 23,111 $ 16,259 $ 13,336 $ 22,480 $ 266,620 $ 391,902 Watch 29 104 361 840 324 708 1,455 3,821 Substandard — 546 739 1,423 386 2,499 820 6,413 Consumer total $ 17,512 $ 33,263 $ 24,211 $ 18,522 $ 14,046 $ 25,687 $ 268,895 $ 402,136 Total Pass $ 865,239 $ 2,595,223 $ 1,487,367 $ 927,474 $ 662,498 $ 1,377,044 $ 983,115 $ 8,897,960 Total Watch 14,091 111,595 162,256 129,962 60,126 124,465 102,806 705,301 Total Substandard 21,790 132,044 39,909 69,504 47,224 109,217 27,507 447,195 Total Loans $ 901,120 $ 2,838,862 $ 1,689,532 $ 1,126,940 $ 769,848 $ 1,610,726 $ 1,113,428 $ 10,050,456 As of December 31, 2020 Amortized Cost Basis of Term Loans by Year of Origination 2020 2019 2018 2017 2016 2015 and Prior Revolving Total Commercial and industrial Pass $ 557,853 $ 340,809 $ 168,873 $ 215,696 $ 101,010 $ 337,834 $ 541,627 $ 2,263,702 Watch 41,574 24,676 19,672 14,262 8,072 2,474 49,432 160,162 Substandard 23,024 16,274 8,897 15,717 9,098 19,537 18,388 110,935 Commercial and industrial total $ 622,451 $ 381,759 $ 197,442 $ 245,675 $ 118,180 $ 359,845 $ 609,447 $ 2,534,799 PPP Pass $ 880,709 $ — $ — $ — $ — $ — $ — $ 880,709 Watch 22,533 — — — — — — 22,533 Substandard 54,543 — — — — — — 54,543 PPP total $ 957,785 $ — $ — $ — $ — $ — $ — $ 957,785 Owner occupied commercial real estate Pass $ 400,662 $ 369,401 $ 300,242 $ 167,470 $ 107,234 $ 213,780 $ 33,759 $ 1,592,548 Watch 15,345 13,764 22,488 20,811 8,717 15,282 4,311 100,718 Substandard 15,914 9,522 12,164 14,147 8,580 21,708 1,105 83,140 Owner occupied commercial real estate total $ 431,921 $ 392,687 $ 334,894 $ 202,428 $ 124,531 $ 250,770 $ 39,175 $ 1,776,406 Non-owner occupied commercial real estate Pass $ 334,722 $ 411,301 $ 305,456 $ 194,101 $ 108,070 $ 233,153 $ 24,466 $ 1,611,269 Watch 22,826 55,225 24,718 18,724 20,954 45,672 5,114 193,233 Substandard 30,899 15,035 23,290 17,046 9,147 21,060 502 116,979 Non-owner occupied commercial real estate total $ 388,447 $ 481,561 $ 353,464 $ 229,871 $ 138,171 $ 299,885 $ 30,082 $ 1,921,481 Real estate construction Pass $ 311,625 $ 309,678 $ 157,171 $ 12,625 $ 6,954 $ 5,110 $ 21,431 $ 824,594 Watch 2,105 26,659 2,403 332 55 388 1,295 33,237 Substandard 196 2,760 2,036 — 39 358 — 5,389 Real estate construction total $ 313,926 $ 339,097 $ 161,610 $ 12,957 $ 7,048 $ 5,856 $ 22,726 $ 863,220 Agricultural and agricultural real estate Pass $ 171,578 $ 90,944 $ 62,349 $ 39,252 $ 17,626 $ 37,696 $ 148,456 $ 567,901 Watch 20,500 16,202 8,854 2,448 3,515 3,157 12,282 66,958 Substandard 17,403 7,044 23,519 6,758 3,917 9,952 11,074 79,667 Agricultural and agricultural real estate total $ 209,481 $ 114,190 $ 94,722 $ 48,458 $ 25,058 $ 50,805 $ 171,812 $ 714,526 Residential real estate Pass $ 153,017 $ 99,440 $ 118,854 $ 83,534 $ 63,477 $ 244,852 $ 33,467 $ 796,641 Watch 3,986 4,507 2,188 1,896 3,117 8,525 — 24,219 Substandard 980 442 2,507 1,528 884 12,141 1,100 19,582 Residential real estate total $ 157,983 $ 104,389 $ 123,549 $ 86,958 $ 67,478 $ 265,518 $ 34,567 $ 840,442 Consumer Pass $ 37,037 $ 27,646 $ 18,811 $ 15,034 $ 4,009 $ 19,483 $ 280,996 $ 403,016 Watch 168 352 647 340 82 646 1,622 3,857 Substandard 481 959 1,884 500 897 1,976 822 7,519 Consumer total $ 37,686 $ 28,957 $ 21,342 $ 15,874 $ 4,988 $ 22,105 $ 283,440 $ 414,392 Total Pass $ 2,847,203 $ 1,649,219 $ 1,131,756 $ 727,712 $ 408,380 $ 1,091,908 $ 1,084,202 $ 8,940,380 Total Watch 129,037 141,385 80,970 58,813 44,512 76,144 74,056 604,917 Total Substandard 143,440 52,036 74,297 55,696 32,562 86,732 32,991 477,754 Total Loans $ 3,119,680 $ 1,842,640 $ 1,287,023 $ 842,221 $ 485,454 $ 1,254,784 $ 1,191,249 $ 10,023,051 Included in the nonpass loans at March 31, 2021 and December 31, 2020 were $84.1 million and $77.1 million, respectively, of nonpass PPP loans as a result of risk ratings on 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. As of March 31, 2021, HTLF had $1.6 million 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, 2021, and December 31, 2020, in thousands: Accruing Loans 30-59 Days 60-89 Days 90 Days or Total Current Nonaccrual Total Loans March 31, 2021 Commercial and industrial $ 3,632 $ 219 $ 49 $ 3,900 $ 2,397,518 $ 19,842 $ 2,421,260 PPP — — — — 1,155,328 — 1,155,328 Owner occupied commercial real estate 519 — — 519 1,824,298 12,742 1,837,559 Non-owner occupied commercial real estate 4,174 584 — 4,758 1,938,728 23,697 1,967,183 Real estate construction 393 — — 393 795,057 577 796,027 Agricultural and agricultural real estate 830 5 — 835 665,069 18,065 683,969 Residential real estate 4,088 1,101 122 5,311 768,401 13,282 786,994 Consumer 525 86 — 611 398,012 3,513 402,136 Total gross loans receivable held to maturity $ 14,161 $ 1,995 $ 171 $ 16,327 $ 9,942,411 $ 91,718 $ 10,050,456 December 31, 2020 Commercial and industrial $ 5,825 $ 2,322 $ 720 $ 8,867 $ 2,504,170 $ 21,762 $ 2,534,799 PPP 1 — — 1 957,784 — 957,785 Owner occupied commercial real estate 2,815 167 — 2,982 1,759,649 13,775 1,776,406 Non-owner occupied commercial real estate 2,143 2,674 — 4,817 1,902,003 14,661 1,921,481 Real estate construction 2,446 96 — 2,542 859,784 894 863,220 Agricultural and agricultural real estate 1,688 — — 1,688 694,150 18,688 714,526 Residential real estate 1,675 83 — 1,758 825,047 13,637 840,442 Consumer 807 139 — 946 409,477 3,969 414,392 Total gross loans receivable held to maturity $ 17,400 $ 5,481 $ 720 $ 23,601 $ 9,912,064 $ 87,386 $ 10,023,051 Loans delinquent 30 to 89 days as a percent of total loans were 0.16% at March 31, 2021, compared to 0.23% at December 31, 2020. Changes in credit risk are monitored on a continuous basis and changes in risk ratings are made when identified. All individually assessed loans are reviewed at least annually. HTLF recognized $0 of interest income on nonaccrual loans during the three months ended March 31, 2021 and March 31, 2020. As of March 31, 2021, and December 31, 2020, HTLF had $30.5 million and $32.5 million of nonaccrual loans with no related allowance, respectively. On December 4, 2020, HTLF's Arizona Bank & Trust subsidiary completed the acquisition of certain assets and substantially all of the deposits and certain other liabilities of Johnson Bank's Arizona operations, headquartered in Racine, Wisconsin. As of December 4, 2020, the Johnson Bank branches acquired had gross loans with a fair value of $150.7 million. On December 4, 2020, HTLF completed the acquisition of AimBank, headquartered in Levelland, Texas. As of December 4, 2020, AimBank had gross loans with a fair value of $1.09 billion.

ALLOWANCE FOR CREDIT LOSSES

ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2021
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, 2021, and March 31, 2020, were as follows, in thousands: Commercial PPP Owner Occupied Commercial Real Estate Non-Owner Occupied Commercial Real Estate Real Estate Construction Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2020 $ 38,818 $ — $ 20,001 $ 20,873 $ 20,080 $ 7,129 $ 11,935 $ 12,770 $ 131,606 Charge-offs (948) — (41) — — (318) (21) (798) (2,126) Recoveries 293 — 53 — 2 21 5 302 676 Provision (2,068) — (597) 3,821 (151) 279 (907) (361) 16 Balance at March 31, 2021 $ 36,095 $ — $ 19,416 $ 24,694 $ 19,931 $ 7,111 $ 11,012 $ 11,913 $ 130,172 Commercial PPP Owner Occupied Commercial Real Estate Non-Owner Occupied Commercial Real Estate Real Estate Construction Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2019 $ 34,207 $ — $ 7,921 $ 7,584 $ 8,677 $ 5,680 $ 1,504 $ 4,822 $ 70,395 Impact of ASU 2016-13 adoption (272) — (114) (2,617) 6,335 (387) 4,817 4,309 12,071 Adjusted balance at January 1, 2020 33,935 — 7,807 4,967 15,012 5,293 6,321 9,131 82,466 Charge-offs (5,230) — — (21) (253) (79) (717) (6,300) Recoveries 264 — 1 — 5 826 3 220 1,319 Provision 3,486 — 2,529 3,353 7,955 (1,069) 2,480 1,131 19,865 Balance at March 31, 2020 $ 32,455 $ — $ 10,337 $ 8,320 $ 22,951 $ 4,797 $ 8,725 $ 9,765 $ 97,350 Changes in the allowance for credit losses on unfunded commitments for the three months ended March 31, 2021 and March 31, 2020, were as follows: Balance at December 31, 2020 $ 15,280 Provision (661) Balance at March 31, 2021 $ 14,619 Balance at December 31, 2019 $ 248 Impact of ASU 2016-13 adoption on January 1, 2020 13,604 Adjusted balance at January 1, 2020 13,852 Provision 1,616 Balance at March 31, 2020 $ 15,468 Management allocates the allowance for credit losses by pools of risk within each loan portfolio. The allocation of the allowance for credit losses by loan portfolio is made for analytical purposes and is not necessarily indicative of the trend of future loan losses in any particular category. The total allowance for credit losses is available to absorb losses from any segment of the loan portfolio.

GOODWILL, CORE DEPOSIT PREMIUM

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS	GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETSHTLF had goodwill of $576.0 million at both March 31, 2021 and December 31, 2020. HTLF conducts its annual internal assessment of the goodwill both at the consolidated level and at its subsidiaries as of September 30. HTLF performed an interim quantitative assessment of goodwill in the second quarter of 2020, which was the most recent annual assessment, and there was no goodwill impairment. HTLF recorded $91.4 million of goodwill and $3.1 million of core deposit intangible in connection with the acquisition of AimBank, headquartered in Levelland, Texas on December 4, 2020. HTLF recorded $38.4 million of goodwill and $1.3 million of core deposit intangible in connection with the acquisition of certain assets and substantially all of the deposits and certain other liabilities of Johnson Bank's Arizona operations, headquartered in Racine, Wisconsin on December 4, 2020. The core deposit intangible recorded with the AimBank acquisition is not deductible for tax purposes and is expected to be amortized over a period of 10 years on an accelerated basis. Goodwill related to the AimBank acquisition resulted from expected operational synergies, increased market presence, cross-selling opportunities, and expanded business lines and is not deductible for tax purposes. The core deposit intangible and goodwill recorded with Johnson Bank transaction are deductible for tax purposes, and the core deposit intangible is expected to be amortized over a period of 10 years on an accelerated basis. HTLF's intangible assets consist of core deposit intangibles, mortgage servicing rights, customer relationship intangibles, and commercial servicing rights. The gross carrying amount of these intangible assets and the associated accumulated amortization at March 31, 2021, and December 31, 2020, are presented in the table below, in thousands: March 31, 2021 December 31, 2020 Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 101,185 $ 61,477 $ 39,708 $ 101,185 $ 58,970 $ 42,215 Customer relationship intangibles 1,177 1,018 159 1,177 1,009 168 Mortgage servicing rights 11,781 5,563 6,218 11,268 6,079 5,189 Commercial servicing rights 7,054 6,319 735 7,054 6,191 863 Total $ 121,197 $ 74,377 $ 46,820 $ 120,684 $ 72,249 $ 48,435 The following table shows the estimated future amortization expense for amortizable intangible assets, in thousands: Core Customer Mortgage Commercial Nine months ending December 31, 2021 $ 6,852 $ 27 $ 1,201 $ 177 $ 8,257 Year ending December 31, 2022 7,702 34 1,254 207 9,197 2023 6,739 33 1,075 149 7,996 2024 5,591 33 896 98 6,618 2025 4,700 32 717 104 5,553 2026 3,533 — 538 — 4,071 Thereafter 4,591 — 537 — 5,128 Total $ 39,708 $ 159 $ 6,218 $ 735 $ 46,820 Projections of amortization expense for mortgage servicing rights are based on existing asset balances and the existing interest rate environment as of March 31, 2021. HTLF's actual experience may be significantly different depending upon changes in mortgage interest rates and market conditions. Mortgage loans serviced for others were approximately $745.1 million at March 31, 2021 compared to $743.3 million at December 31, 2020. Custodial escrow balances maintained in connection with the mortgage loan servicing portfolio were approximately $9.4 million at March 31, 2021 and $5.7 million at December 31, 2020. At March 31, 2021, the fair value of the mortgage servicing rights was estimated at $6.2 million compared to $5.2 million at December 31, 2020. The fair value of mortgage servicing rights is calculated based upon a discounted cash flow analysis. Cash flow assumptions, including prepayment speeds, servicing costs and escrow earnings of the mortgage servicing rights are considered in the calculation. The average constant prepayment rate was 14.20% for the March 31, 2021 valuation compared to 16.20% for the December 31, 2020 valuation. The discount rate was 9.02% for both March 31, 2021 and December 31, 2020. The average capitalization rate for the first three months of 2021 ranged from 76 to 112 basis points compared to a range of 95 to 116 basis points for the first three months of 2020. Fees collected for the servicing of mortgage loans for others were $464,000 and $409,000 for the quarter ended March 31, 2021 and March 31, 2020. The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the three months ended March 31, 2021, and March 31, 2020: 2021 2020 Balance at January 1, $ 5,189 $ 5,621 Originations 512 376 Amortization (400) (307) Sale of mortgage servicing rights — — Valuation adjustment 917 (1,565) Balance at period end $ 6,218 $ 4,125 Mortgage servicing rights, net to servicing portfolio 0.83 % 0.67 % HTLF's commercial servicing portfolio is comprised of loans guaranteed by the United States Small Business Administration ("SBA") and United States Department of Agriculture that have been sold with servicing retained by HTLF, which totaled $62.4 million at March 31, 2021 and $66.2 million at December 31, 2020. The commercial servicing rights portfolio is separated into two tranches at the respective HTLF subsidiary, loans with a term of less than 20 years and loans with a term of more than 20 years. Fees collected for the servicing of commercial loans for others were $129,000 and $118,000 for the quarter ended March 31, 2021 and March 31, 2020. The fair value of each commercial servicing rights portfolio is calculated based upon a discounted cash flow analysis. Cash flow assumptions, including prepayment speeds and servicing costs, are considered in the calculation. The range of average constant prepayment rates for the valuations was 13.83% to 17.76% as of March 31, 2021 compared to 14.95% to 19.25% as of December 31, 2020. The discount rate range was 6.89% to 8.53% for the March 31, 2021, valuations compared to 7.70% to 12.88% for the December 31, 2020 valuations. The capitalization rate for 2020 ranged from 310 to 445 basis points. The total fair value of the commercial servicing rights was estimated at $1.2 million as of March 31, 2021, and $1.3 million as of December 31, 2020. The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the three months ended March 31, 2021, and March 31, 2020: 2021 2020 Balance at January 1, $ 863 $ 1,115 Originations — 38 Amortization (128) (58) Balance at period end $ 735 $ 1,095 Fair value of commercial servicing rights $ 1,239 $ 1,407 Commercial servicing rights, net to servicing portfolio 1.18 % 1.41 % Mortgage and commercial servicing rights are initially recorded at fair value in net gains on sale of loans held for sale when they are capitalized through loan sales. Fair value is based on market prices for comparable servicing contracts, when available, or based on a valuation model that calculates the present value of estimated future net servicing income. Mortgage and commercial servicing rights are subsequently measured using the amortization method, which requires the asset to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Servicing rights are evaluated for impairment at each HTLF subsidiary based upon the fair value of the assets as compared to the carrying amount. Impairment is recognized through a valuation allowance for specific tranches to the extent that fair value is less than the carrying amount at each HTLF subsidiary. At March 31, 2021, a $401,000 valuation allowance was required on the mortgage servicing rights 15-year tranche and a $1.4 million valuation allowance was required on the mortgage servicing rights 30-year tranche. At December 31, 2020, a $422,000 valuation allowance was required on the mortgage servicing rights 15-year tranche and a $1.4 million valuation allowance was required on the mortgage servicing rights 30-year tranche. At both March 31, 2021 and December 31, 2020, no valuation allowance was required on commercial servicing rights with a term less than 20 years and no valuation allowance was required on commercial servicing rights with a term greater than 20 years. The following table summarizes, in thousands, the book value, the fair value of each tranche of the mortgage servicing rights and any recorded valuation allowance at each respective subsidiary at March 31, 2021, and December 31, 2020: March 31, 2021 Book Value 15-Year Tranche Fair Value 15-Year Tranche Valuation Allowance Book Value 30-Year Tranche Fair Value 30-Year Tranche Valuation Allowance First Bank & Trust $ 1,667 $ 1,266 $ 401 $ 6,380 $ 4,952 $ 1,428 December 31, 2020 First Bank & Trust $ 1,522 $ 1,100 $ 422 $ 5,445 $ 4,089 $ 1,356 The following table summarizes, in thousands, the book value, the fair value of each tranche of the commercial servicing rights and any recorded valuation allowance at each respective subsidiary at March 31, 2021, and December 31, 2020: Book Value Fair Value Valuation Allowance Book Value Fair Value Valuation Allowance March 31, 2021 $ 80 $ 230 $ — $ 655 $ 1,009 $ — December 31, 2020 $ 87 $ 203 $ — $ 776 $ 1,085 $ —

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2021
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. As part of the strategy, HTLF considers the use of interest rate swaps, caps, floors, collars, and certain interest rate lock commitments and forward sales of securities related to mortgage banking activities. HTLF's current strategy includes the use of interest rate swaps, interest rate lock commitments and forward sales of mortgage securities. In addition, HTLF is facilitating back-to-back loan swaps to assist customers in managing interest rate risk. 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. In addition, interest rate-related derivative instruments generally contain language outlining collateral pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain threshold limits which are determined by credit ratings of each counterparty. HTLF was required to pledge $2.9 million of cash as collateral at March 31, 2021 compared to $3.8 million at December 31, 2020. At both March 31, 2021 and December 31, 2020, no collateral was required to be pledged by HTLF's counterparties. HTLF's derivative and hedging instruments are recorded at fair value on the consolidated balance sheets. See Note 8, “Fair Value,” for additional fair value information and disclosures. Cash Flow Hedges HTLF has variable rate funding which creates exposure to variability in interest payments due to changes in interest rates. To manage the interest rate risk related to the variability of interest payments, HTLF has entered into various interest rate swap agreements. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are received or made on HTLF's variable-rate liabilities. For the three months ended March 31, 2021, the change in net unrealized losses on cash flow hedges reflects changes in the fair value of the swaps and reclassification from accumulated other comprehensive income to interest expense totaling $591,000. For the next twelve months, HTLF estimates that cash payments and reclassification from accumulated other comprehensive income to interest expense will total $2.4 million. HTLF entered into forward starting interest rate swap transactions to effectively convert Heartland Financial Statutory Trust IV, VI, and VII, which total $65.0 million, from variable rate subordinated debentures to fixed rate debt. For accounting purposes, these swap transactions are designated as cash flow hedges of the changes in LIBOR, the benchmark interest rate being hedged, associated with the interest payments made on $65.0 million of HTLF's subordinated debentures that reset quarterly on a specified reset date. At inception, HTLF asserted that the underlying principal balance would remain outstanding throughout the hedge transaction, making it probable that sufficient LIBOR-based interest payments would exist through the maturity date of the swaps. During the first quarter of 2021, the interest rate swap transaction associated with Heartland Financial Statutory Trust IV, totaling $25.0 million, matured and the fixed rate debt has been converted to a variable rate subordinated debenture. On May 18, 2018, HTLF acquired cash flow hedges related to OCGI Statutory Trust III and OCGI Capital Trust IV with notional amounts of $3.0 million and $6.0 million, respectively, in the First Bank Lubbock Bancshares, Inc. transaction. The cash flow hedges effectively convert OCGI Statutory Trust III and OGCI Capital Trust IV from variable rate subordinated debentures to fixed rate debt. These swaps are designated as cash flow hedges of the changes in LIBOR, the benchmark interest rate being hedged, associated with the interest payments made on $9.0 million of HTLF's subordinated debentures that reset quarterly on a specified reset date. The table below identifies the balance sheet category and fair values of HTLF's derivative instruments designated as cash flow hedges at March 31, 2021, and December 31, 2020, in thousands: Notional Fair Balance Receive Weighted Maturity March 31, 2021 Interest rate swap $ 25,000 $ — Other liabilities — % — % 03/17/2021 Interest rate swap 20,667 (37) Other liabilities 2.606 3.674 05/10/2021 Interest rate swap 22,000 (1,669) Other liabilities 2.607 5.425 07/24/2028 Interest rate swap 20,000 (1,194) Other liabilities 0.184 2.390 06/15/2024 Interest rate swap 20,000 (1,144) Other liabilities 0.225 2.352 03/01/2024 Interest rate swap 6,000 (26) Other liabilities 0.184 1.866 06/15/2021 Interest rate swap 3,000 (13) Other liabilities 0.184 1.878 06/30/2021 December 31, 2020 Interest rate swap $ 25,000 $ (127) Other liabilities 0.229 % 2.255 % 03/17/2021 Interest rate swap 21,667 (91) Other liabilities 2.649 3.674 05/10/2021 Interest rate swap 22,750 (2,220) Other liabilities 2.643 5.425 07/24/2028 Interest rate swap 20,000 (1,482) Other liabilities 0.217 2.390 06/15/2024 Interest rate swap 20,000 (1,385) Other liabilities 0.225 2.352 03/01/2024 Interest rate swap 6,000 (50) Other liabilities 0.217 1.866 06/15/2021 Interest rate swap 3,000 (25) Other liabilities 0.241 1.878 06/30/2021 The table below identifies the gains and losses recognized on HTLF's derivative instruments designated as cash flow hedges for the three months ended March 31, 2021, and March 31, 2020, in thousands: Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Category Amount of Category Amount of Three Months Ended March 31, 2021 Interest rate swaps $ 1,297 Interest expense $ 591 Other income $ — Three Months Ended March 31, 2020 Interest rate swaps $ (3,863) Interest expense $ 183 Other income $ — 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 uses hedge accounting in accordance with ASC 815, with the unrealized gains and losses, representing the change in fair value of the derivative and the change in fair value of the risk being hedged on the related loan, being recorded in the consolidated statements of income. The ineffective portions of the unrealized gains or losses, if any, are recorded in interest income and interest expense in the consolidated statements of income. 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. HTLF was required to pledge $3.8 million and $4.2 million of cash as collateral for these fair value hedges at March 31, 2021, and December 31, 2020, respectively. The table below identifies the notional amount, fair value and balance sheet category of HTLF's fair value hedges at March 31, 2021, and December 31, 2020, in thousands: Notional Amount Fair Value Balance Sheet Category March 31, 2021 Fair value hedges $ 20,734 $ (1,717) Other liabilities December 31, 2020 Fair value hedges $ 20,841 $ (2,480) Other liabilities The table below identifies the gains and losses recognized on HTLF's fair value hedges for the three months ended March 31, 2021, and March 31, 2020, in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended March 31, 2021 Fair value hedges $ 763 Interest income Three Months Ended March 31, 2020 Fair value hedges $ (1,677) Interest income Embedded Derivatives HTLF has fixed rate loans with embedded derivatives. The 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, 2021, and December 31, 2020, in thousands: Notional Amount Fair Value Balance Sheet Category March 31, 2021 Embedded derivatives $ 9,084 $ 551 Other assets December 31, 2020 Embedded derivatives $ 9,198 $ 680 Other assets The table below identifies the gains and losses recognized on HTLF's embedded derivatives for the three months ended March 31, 2021, and March 31, 2020, in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended March 31, 2021 Embedded derivatives $ (129) Other noninterest income Three Months Ended March 31, 2020 Embedded derivatives $ 361 Other noninterest income Back-to-Back Loan Swaps HTLF has interest rate swap loan relationships with customers to meet their financing needs. Upon entering into these loan swaps, HTLF enters into offsetting positions with counterparties in order to minimize interest rate risk. 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. HTLF was required to post $27.9 million and $46.5 million as of March 31, 2021, and December 31, 2020, respectively, as collateral related to these back-to-back swaps. HTLF's counterparties were required to pledge $0 at both March 31, 2021, and December 31, 2020. 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, 2021 and March 31, 2020, no gain or loss was recognized. The table below identifies the balance sheet category and fair values of the derivative instruments designated as loan swaps at March 31, 2021, and December 31, 2020, in thousands: Notional Fair Balance Sheet Weighted Weighted March 31, 2021 Customer interest rate swaps $ 444,056 $ 23,440 Other assets 4.51 % 2.48 % Customer interest rate swaps 444,056 (23,440) Other liabilities 2.48 4.51 December 31, 2020 Customer interest rate swaps $ 440,719 $ 43,422 Other assets 4.46 % 2.46 % Customer interest rate swaps 440,719 (43,422) Other liabilities 2.46 4.46 Other Free Standing Derivatives HTLF has entered into interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans and mortgage backed securities that are considered derivative instruments. HTLF enters into forward commitments for the future delivery of residential mortgage loans when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on the commitments to fund the loans as well as on residential mortgage loans available for sale. The fair value of these commitments is recorded on the consolidated balance sheets, with the changes in fair value recorded in the consolidated statements of income as a component of gains on sale of loans held for sale. These derivative contracts are designated as free standing derivative contracts and are not designated against specific assets and liabilities on the consolidated balance sheets or forecasted transactions and therefore do not qualify for hedge accounting treatment. HTLF was required to pledge no collateral at both March 31, 2021, and December 31, 2020. HTLF's counterparties were required to pledge no collateral at both March 31, 2021 and December 31, 2020, as collateral for these forward commitments. 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 sheet 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, 2021, and December 31, 2020, in thousands: Balance Sheet Category Notional Amount Fair Value March 31, 2021 Interest rate lock commitments (mortgage) Other assets $ 54,369 $ 1,857 Forward commitments Other assets 83,500 1,213 Forward commitments Other liabilities 2,000 (4) Undesignated interest rate swaps Other liabilities 9,084 (551) December 31, 2020 Interest rate lock commitments (mortgage) Other assets $ 42,078 $ 1,827 Forward commitments Other assets — — Forward commitments Other liabilities 86,500 (697) Undesignated interest rate swaps Other liabilities 9,198 (680) The table below identifies the income statement category of 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, 2021, and March 31, 2020, in thousands: Income Statement Category Gain (Loss) Recognized Three Months Ended March 31, 2021 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (1,485) Forward commitments Net gains on sale of loans held for sale 1,906 Undesignated interest rate swaps Other noninterest income 129 Three Months Ended March 31, 2020 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ 1,698 Forward commitments Net gains on sale of loans held for sale (1,146) Undesignated interest rate swaps Other noninterest income (361)

FAIR VALUE

FAIR VALUE	3 Months Ended
	Mar. 31, 2021
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, mortgage servicing rights, 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 and are recorded at fair value only to the extent a decline in fair value is determined to be other-than-temporary. 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. 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 values premises, furniture and equipment held for sale based on third-party appraisals less estimated disposal costs. HTLF considers third party appraisals, 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. 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. Mortgage Servicing Rights Mortgage servicing rights assets represent the value associated with servicing residential real estate loans that have been sold to outside investors with servicing retained. The fair value for servicing assets is determined through discounted cash flow analysis and utilizes discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of the assumptions in the discounted cash flow analysis require a significant degree of management estimation and judgment. Mortgage servicing rights are subject to impairment testing. The carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. For purposes of measuring impairment, the rights are stratified into certain risk characteristics including note type and note term. If the valuation model reflects a fair value less than the carrying value, mortgage servicing rights are adjusted to fair value through a valuation allowance. HTLF classifies mortgage servicing rights as nonrecurring with Level 3 measurement inputs. Commercial Servicing Rights Commercial servicing rights assets represent the value associated with servicing commercial loans guaranteed by the Small Business Administration and the United States Department of Agriculture that have been sold with servicing retained by HTLF. HTLF uses the amortization method (i.e., the lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, to determine the carrying value of its commercial servicing rights. The fair value for servicing assets is determined through market prices for comparable servicing contracts, when available, or through a valuation model that calculates the present value of estimated future net servicing income. Inputs utilized include discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of these assumptions require a significant degree of management estimation and judgment. Commercial servicing rights are subject to impairment testing, and the carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. If the valuation model reflects a fair value less than the carrying value, commercial servicing rights are adjusted to fair value through a valuation allowance. HTLF classifies commercial servicing rights as nonrecurring with Level 3 measurement inputs. Derivative Financial Instruments HTLF's current interest rate risk strategy includes 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 as 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, 2021, and December 31, 2020, 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. Interest rate lock commitments HTLF uses an internal valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments which is based on unobservable inputs that reflect management's assumptions and specific information about each borrower. Interest rate lock commitments are classified in Level 3 of the fair value hierarchy. Forward commitments The fair value of forward commitments are estimated using an internal valuation model, which includes current trade pricing for similar financial instruments in active markets that HTLF has the ability to access and 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 HTLFs assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2021, and December 31, 2020, 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, 2021 Assets Securities available for sale U.S. treasuries $ 1,019 $ 1,019 $ — $ — U.S. agencies 212,292 — 212,292 — Obligations of states and political subdivisions 1,737,989 — 1,737,989 — Mortgage-backed securities - agency 1,432,929 — 1,432,929 — Mortgage-backed securities - non-agency 1,503,716 — 1,503,716 — Commercial mortgage-backed securities - agency 122,230 — 122,230 — Commercial mortgage-backed securities - non-agency 307,774 — 307,774 — Asset-backed securities 1,028,213 — 1,028,213 — Corporate bonds 3,790 — 3,790 — Equity securities with a readily determinable fair value 20,543 — 20,543 — Derivative financial instruments (1) 23,991 — 23,991 — Interest rate lock commitments 1,857 — — 1,857 Forward commitments 1,213 — 1,213 — Total assets at fair value $ 6,397,556 $ 1,019 $ 6,394,680 $ 1,857 Liabilities Derivative financial instruments (2) $ 29,791 $ — $ 29,791 $ — Forward commitments 4 — 4 — Total liabilities at fair value $ 29,795 $ — $ 29,795 $ — December 31, 2020 Assets Securities available for sale U.S. treasuries $ 2,026 $ 2,026 $ — $ — U.S. agencies 166,779 — 166,779 — Obligations of states and political subdivisions 1,635,227 — 1,635,227 — Mortgage-backed securities - agency 1,355,270 — 1,355,270 — Mortgage-backed securities - non-agency 1,449,116 — 1,449,116 — Commercial mortgage-backed securities - agency 174,153 — 174,153 — Commercial mortgage-backed securities - non-agency 252,767 — 252,767 — Asset-backed securities 1,069,266 — 1,069,266 — Corporate bonds 3,742 — 3,742 — Equity securities with a readily determinable fair value 19,629 — 19,629 — Derivative financial instruments (1) 44,102 — 44,102 — Interest rate lock commitments 1,827 — — 1,827 Total assets at fair value $ 6,173,904 $ 2,026 $ 6,170,051 $ 1,827 Liabilities Derivative financial instruments (2) $ 51,962 $ — $ 51,962 $ — Forward commitments 697 — 697 — Total liabilities at fair value $ 52,659 $ — $ 52,659 $ — (1) Includes embedded derivatives, back-to-back loan swaps and fair value hedges. (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded derivatives and free standing derivative instruments. The tables below present HTLF's assets that are measured at fair value on a nonrecurring basis, in thousands: Fair Value Measurements at March 31, 2021 Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 10,621 $ — $ — $ 10,621 $ 859 Owner occupied commercial real estate 1,233 — — 1,233 — Non-owner occupied commercial real estate 12,050 — — 12,050 — Real estate construction — — — — — Agricultural and agricultural real estate 7,271 — — 7,271 — Total collateral dependent individually assessed loans $ 31,175 $ — $ — $ 31,175 $ 859 Loans held for sale $ 43,037 $ — $ 43,037 $ — $ (1,121) Other real estate owned 6,236 — — 6,236 (154) Premises, furniture and equipment held for sale 7,633 — — 7,633 — Servicing rights 6,218 — — 6,218 (917) Fair Value Measurements at Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 11,256 $ — $ — $ 11,256 $ 451 Owner occupied commercial real estate 5,874 — — 5,874 11,631 Non-owner occupied commercial real estate 4,907 — — 4,907 — Real estate construction — — — — — Agricultural and agricultural real estate 12,451 — — 12,451 — Total collateral dependent individually assessed loans $ 34,488 $ — $ — $ 34,488 $ 12,082 Loans held for sale $ 57,949 $ — $ 57,949 $ — $ (982) Other real estate owned 6,624 — — 6,624 1,044 Premises, furniture and equipment held for sale 6,499 — — 6,499 3,288 Servicing rights 5,189 — — 5,189 1,778 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 Interest rate lock commitments $ 1,857 Discounted cash flows Closing ratio 0-99% (88%) (1) Other real estate owned 6,236 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Servicing rights 6,218 Discounted cash flows Third party valuation (4) Premises, furniture and equipment held for sale 7,633 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Collateral dependent individually assessed loans: Commercial 10,621 Modified appraised value Third party appraisal (2) Appraisal discount 0-7% (3) Owner occupied commercial real estate 1,233 Modified appraised value Third party appraisal (2) Appraisal discount 0-12% (3) Non-owner occupied commercial real estate 12,050 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Agricultural and agricultural real estate 7,271 Modified appraised value Third party appraisal (2) Appraisal discount 0-9% (3) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) 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. (3) 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. (4) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups. Fair Value at Valuation Unobservable Range Interest rate lock commitments $ 1,827 Discounted cash flows Closing ratio 0-99% (86%) (1) Other real estate owned 6,624 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Servicing rights 5,189 Discounted cash flows Third party valuation (4) Premises, furniture and equipment held for sale 6,499 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Collateral dependent individually assessed loans: Commercial and industrial 11,256 Modified appraised value Third party appraisal (2) Appraisal discount 0-8% (3) Owner occupied commercial real estate 5,874 Modified appraised value Third party appraisal (2) Appraisal discount 0-12% (3) Non-owner occupied commercial real estate 4,907 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Agricultural and agricultural real estate 12,451 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) 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. (3) 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. (4) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups. The changes in fair value of the interest rate lock commitments, which are Level 3 financial instruments measured on a recurring basis, are summarized in the following table, in thousands: For the Three Months Ended For the Year Ended Balance at January 1, $ 1,827 $ 681 Total net gains included in earnings (1,485) 2,803 Issuances 5,279 17,221 Settlements (3,764) (18,878) Balance at period end $ 1,857 $ 1,827 Gains included in gains (losses) on sale of loans held for sale attributable to interest rate lock commitments held at March 31, 2021, and December 31, 2020, were $1.9 million and $1.8 million, respectively. 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, 2021, and December 31, 2020, 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 the commercial and mortgage servicing rights, 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, 2021 Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 467,862 $ 467,862 $ 467,862 $ — $ — Time deposits in other financial institutions 3,138 3,138 3,138 — — Securities: Carried at fair value 6,370,495 6,370,495 1,019 6,369,476 — Held to maturity 85,293 95,082 — 95,082 — Other investments 74,935 74,935 — 74,935 — Loans held for sale 43,037 43,037 — 43,037 — Loans, net: Commercial and industrial 2,385,165 2,368,895 — 2,358,274 10,621 PPP 1,155,328 1,155,328 — 1,155,328 — Owner occupied commercial real estate 1,818,143 1,804,021 — 1,802,788 1,233 Non-owner occupied commercial real estate 1,942,489 1,933,621 — 1,921,571 12,050 Real estate construction 776,096 782,155 — 782,155 — Agricultural and agricultural real estate 676,858 669,714 — 662,443 7,271 Residential real estate 775,982 775,020 — 775,020 — Consumer 390,223 394,731 — 394,731 — Total Loans, net 9,920,284 9,883,485 — 9,852,310 31,175 Cash surrender value on life insurance 188,521 188,521 — 188,521 — Derivative financial instruments (1) 23,991 23,991 — 23,991 — Interest rate lock commitments 1,857 1,857 — — 1,857 Forward commitments 1,213 1,213 — 1,213 — Financial liabilities: Deposits Demand deposits 6,175,946 6,175,946 — 6,175,946 — Savings deposits 8,179,251 819,251 — 819,251 — Time deposits 1,203,854 1,203,854 — 1,203,854 — Short term borrowings 140,597 140,597 — 140,597 — Other borrowings 349,514 350,964 — 350,964 — Derivative financial instruments (2) 29,791 29,791 — 29,791 — Forward commitments 4 4 — 4 — (1) Includes embedded derivatives, back-to-back loan swaps and fair value hedges. (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps and free standing derivative instruments. Fair Value Measurements at Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 337,903 $ 337,903 $ 337,903 $ — $ — Time deposits in other financial institutions 3,129 3,129 3,129 — — Securities: Carried at fair value 6,127,975 6,127,975 2,026 6,125,949 — Held to maturity 88,839 100,041 — 100,041 — Other investments 75,253 75,523 — 75,523 — Loans held for sale 57,949 57,949 — 57,949 — Loans, net: Commercial and industrial 2,495,981 2,391,041 — 2,379,785 11,256 PPP 957,785 957,785 — 957,785 — Owner occupied commercial real estate 1,756,405 1,745,397 — 1,739,523 5,874 Non-owner occupied commercial real estate 1,900,608 1,892,213 — 1,887,306 4,907 Real estate construction 843,140 849,224 — 849,224 — Agricultural and agricultural real estate 707,397 697,729 — 685,278 12,451 Residential real estate 828,507 828,366 — 828,366 — Consumer 401,622 407,914 — 407,914 — Total Loans, net 9,891,445 9,769,669 — 9,735,181 34,488 Cash surrender value on life insurance 187,664 187,664 — 187,664 — Derivative financial instruments (1) 44,102 44,102 — 44,102 — Interest rate lock commitments 1,827 1,827 — — 1,827 Financial liabilities: Deposits Demand deposits 5,688,810 5,688,810 — 5,688,810 — Savings deposits 8,019,704 8,019,704 — 8,019,704 — Time deposits 1,271,391 1,273,468 — 1,273,468 — Short term borrowings 167,872 167,872 — 167,872 — Other borrowings 457,042 458,806 — 458,806 — Derivative financial instruments (1) 51,962 51,962 — 51,962 — Forward commitments 697 697 — 697 — (1) Includes embedded derivatives, back-to-back loan swaps and fair value hedges. (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps and free standing derivative instruments. 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 counter-party. Interest Rate Lock Commitments — The fair value of interest rate lock commitments is estimated using an internal valuation model, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated closing ratio based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment group. Forward Commitments — The fair value of these instruments is estimated using an internal valuation model, which includes current trade pricing for similar financial instruments. 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. Short-term and Other Borrowings — 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.

REVENUE

REVENUE	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers, requires revenue to be recognized at an amount that reflects the consideration to which HTLF expects to be entitled in exchange for transferring goods or services to a customer. ASC 606 applies to all contracts with customers to provide goods or services in the ordinary course of business, except for contracts that are specifically excluded from its scope. The majority of HTLF's revenue streams including interest income, loan servicing income, net securities gain, net unrealized gains and losses on equity securities, net gains on sale of loans held for sale, valuation adjustment on servicing rights, income from bank owned life insurance and other noninterest income are outside the scope of ASC 606. Revenue streams including service charges and fees, interchange fees on credit and debit cards, trust fees and brokerage and insurance commissions are within the scope of ASC 606. Service Charges and Fees Service charges and fees consist of revenue generated from deposit account related service charges and fees, overdraft fees, customer service fees and other service charges, credit card fee income, debit card income and other service charges and fees. Service charges on deposit accounts consist of account analysis fees (i.e., net fees earned on analyzed business and public checking accounts), monthly service fees, check orders and other deposit account related fees. HTLF's performance obligation for account analysis fees and monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Check orders and other deposit account related fees, including overdraft fees, are largely transaction based, and therefore, the performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. Customer service fees and other service charges include revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. HTLF's performance obligation for fees, exchange, and other service charges are largely satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month. Credit card fee income and debit card income are comprised of interchange fees, ATM fees, and merchant services income. Credit card fee income and debit card income are earned whenever the banks' debit and credit cards are processed through card payment networks such as Visa. ATM fees are primarily generated when a bank cardholder uses an ATM that is not owned by one of HTLF's banks or a non-bank cardholder uses a HTLF-owned ATM. Merchant services income mainly represents fees charged to merchants to process their debit and credit card transactions, in addition to account management fees. Trust Fees Trust fees are primarily comprised of fees earned from the management and administration of trusts and other customer assets. HTLF's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the average daily market value or month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days before or after month end through a direct charge to customers’ accounts. HTLF does not earn performance-based incentives. Optional services such as real estate sales and tax return preparation services are also available to existing trust and asset management customers. HTLF's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and Insurance Commissions Brokerage commission primarily consist of commissions related to broker-dealer contracts. The contracts are between the customer and the broker-dealer, and HTLF satisfies its performance obligation and earns commission when the transactions are completed. The recognition of revenue is based on a defined fee schedule and does not require significant judgment. Payment is received shortly after services are rendered. Insurance commissions are related to commissions received directly from the insurance carrier. HTLF acts as an insurance agent between the customer and the insurance carrier. HTLF's performance obligations and associated fee and commission income are defined with each insurance product with the insurance company. When insurance payments are received from customers, a portion of the payment is recognized as commission revenue. The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2021, and 2020, in thousands: Three Months Ended 2021 2020 In-scope of Topic 606 Service charges and fees Service charges and fees on deposit accounts $ 3,936 $ 3,438 Overdraft fees 2,592 2,809 Customer service and other service fees 46 59 Credit card fee income 4,308 3,900 Debit card income 2,789 1,815 Total service charges and fees 13,671 12,021 Trust fees 5,777 5,022 Brokerage and insurance commissions 853 733 Total noninterest income in-scope of Topic 606 20,301 17,776 Out-of-scope of Topic 606 Loan servicing income $ 838 $ 963 Securities gains (losses), net (30) 1,658 Unrealized loss on equity securities, net (110) (231) Net gains on sale of loans held for sale 6,420 4,660 Valuation adjustment on servicing rights 917 (1,565) Income on bank owned life insurance 829 498 Other noninterest income 1,152 2,058 Total noninterest income out-of-scope of Topic 606 10,016 8,041 Total noninterest income $ 30,317 $ 25,817 Contract Balances

STOCK COMPENSATION

STOCK COMPENSATION	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
STOCK COMPENSATION	STOCK COMPENSATION HTLF may grant, through its Nominating, Compensation and Corporate Governance Committee (the "Compensation Committee"), non-qualified and incentive stock options, stock appreciation rights, stock awards, restricted stock, restricted stock units and cash incentive awards, under its 2020 Long-Term Incentive Plan (the "Plan"). The Plan was approved by stockholders in May 2020 and replaces the 2012 Long-Term Incentive Plan. The Plan increased the number of shares of common stock authorized for issuance to 1,460,000 and made certain other changes to the Plan. As of March 31, 2021, 1,239,003 shares of common stock were available for issuance under future awards that may be granted under the Plan to employees and directors of, and service providers to, HTLF or its subsidiaries. ASC Topic 718, "Compensation-Stock Compensation," requires the measurement of the cost of employee services received in exchange for an award of equity instruments based upon the fair value of the award on the grant date. The cost of the 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 $153,000 of tax benefit during the three months ended March 31, 2021 and a tax expense of $25,000 during the three months ended March 31, 2020, 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"). In the first quarter of 2021, the Compensation Committee granted time-based RSUs with respect to 104,462 shares of common stock, and in the first quarter of 2020, the Compensation Committee granted time-based RSUs with respect to 114,944 shares of common stock to selected officers and employees. The time-based RSUs represent the right, without payment, to receive shares of HTLF common stock on a specified date in the future. The time-based RSUs granted in 2021 and 2020 vest over three years in equal installments in March of each of the three years following the year of the grant. The time-based RSUs may also vest upon death or disability, upon a change in control or upon a "qualified retirement" (as defined in the RSU agreement). The retiree is required to sign a non-solicitation agreement as a condition to vesting. The Compensation Committee also granted three three The three twenty-four All of HTLF's RSUs will be settled in common stock upon vesting and are not entitled to dividends until vested. The Compensation Committee may grant RSUs under the Plan to directors as part of their compensation, to new management level employees at commencement of employment, and to other employees and service providers as incentives. During the three months ended March 31, 2021, and March 31, 2020, 3,778 and 0 time-based RSUs, respectively, were granted to directors and new employees. A summary of the RSUs outstanding as of March 31, 2021, and 2020, and changes during the three months ended March 31, 2021 and 2020, follows: 2021 2020 Shares Weighted-Average Grant Date Shares Weighted-Average Grant Date Outstanding at January 1, 348,275 $ 38.22 254,383 $ 46.76 Granted 170,317 52.08 165,731 32.57 Vested (106,255) 44.14 (86,441) 45.48 Forfeited (4,215) 50.59 (11,929) 48.38 Outstanding at March 31, 408,122 $ 42.11 321,744 $ 40.14 Total compensation costs recorded for RSUs were $2.7 million and $2.2 million for the three months ended March 31, 2021 and 2020. As of March 31, 2021, there were $11.9 million of total unrecognized compensation costs related to the Plan for RSUs that are expected to be recognized through 2023.

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	3 Months Ended
	Mar. 31, 2021
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, 2020, included in the Form 10-K of Heartland Financial USA, Inc. ("HTLF") filed with the Securities and Exchange Commission ("SEC") on February 25, 2021 . 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, 2021, are not necessarily indicative of the results expected for the year ending December 31, 2021.
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.
Effect of New Financial Accounting Standards	ASU 2018-16 In October 2018, the FASB issued ASU 2018-16, " Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting." In the United States, eligible benchmark interest rates under Topic 815 are interest rates on direct Treasury obligations of the U.S. government, the London Interbank Offered Rate ("LIBOR") swap rate, and the Overnight Index Swap ("OIS") Rate based on the Fed Funds Effective Rate. When the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities , in August 2017, it introduced the Securities Industry and Financial Markets Association ("SIFMA") Municipal Swap Rate as the fourth permissible U.S. benchmark rate. ASU 2018-16 adds the OIS rate based on the Secured Overnight Financing Rate ("SOFR") as a U.S. benchmark interest rate to facilitate the LIBOR to SOFR transition and provide sufficient lead time for entities to prepare for changes to interest rate risk hedging strategies for both risk management and hedge accounting purposes. ASU 2018-16 became effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years and the financial statement impact immediately upon adoption was immaterial. The future financial statement impact will depend on any new contracts entered into using new benchmark rates, as well as any existing contracts that are migrated from LIBOR to new benchmark interest rates. HTLF has a formal working group that is currently evaluating the impact of the transition from LIBOR as an interest rate benchmark to other potential alternative reference rates, including but not limited to the SOFR. Currently, HTLF has adjustable rate loans, several debt obligations and securities and derivative instruments in place that reference LIBOR-based rates. The transition from LIBOR is expected to take place at the end of 2021, and management will continue to actively assess the related opportunities and risks involved in this transition. ASU 2019-12 In December 2019, the FASB issued ASU 2019-12, "Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes." ASU 2019-12 simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in ASC 740 related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition for deferred tax liabilities for outside basis differences. ASU 2019-12 also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. HTLF adopted this ASU on January 1, 2021, as required, and the adoption did not have a material impact on its results of operations, financial position and liquidity. ASU 2020-04 In March 2020, the FASB issued ASU 2020-04, " Reference Rate Reform, " which provides optional expedients and exceptions for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. For loan and lease agreements that are modified because of reference rate reform and that meet certain scope guidance (i) modifications of loan agreements should be accounted for by prospectively adjusting the effective interest rate, and the modifications would be considered "minor" with the result that any existing unamortized origination fees/costs would carry forward and continue to be amortized and (ii) modifications of lease agreements should be accounted for as a continuation of the existing agreement, with no reassessments of the lease classification and the discount rate or remeasurements of lease payments that otherwise would be required for modifications not accounted for as separate contracts. ASU 2020-04 also provides numerous optional expedients for derivative accounting. ASU 2020-04 is effective March 12, 2020 through December 31, 2022. An entity may elect to apply ASU 2020-04 for contract modifications as of January 1, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic within the ASC, ASU 2020-04 must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. HTLF anticipates that ASU 2020-04 will simplify any modifications executed between the selected start date and December 31, 2022 that are directly related to LIBOR transition by allowing prospective recognition of the continuation of the contract, rather than extinguishment of the old contract that would result in writing off unamortized fees/costs. Management will continue to actively assess the impacts of ASU 2020-04 and the related opportunities and risks involved in the LIBOR transition.
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 and are recorded at fair value only to the extent a decline in fair value is determined to be other-than-temporary. 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. 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 values premises, furniture and equipment held for sale based on third-party appraisals less estimated disposal costs. HTLF considers third party appraisals, 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. 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. Mortgage Servicing Rights Mortgage servicing rights assets represent the value associated with servicing residential real estate loans that have been sold to outside investors with servicing retained. The fair value for servicing assets is determined through discounted cash flow analysis and utilizes discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of the assumptions in the discounted cash flow analysis require a significant degree of management estimation and judgment. Mortgage servicing rights are subject to impairment testing. The carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. For purposes of measuring impairment, the rights are stratified into certain risk characteristics including note type and note term. If the valuation model reflects a fair value less than the carrying value, mortgage servicing rights are adjusted to fair value through a valuation allowance. HTLF classifies mortgage servicing rights as nonrecurring with Level 3 measurement inputs. Commercial Servicing Rights Commercial servicing rights assets represent the value associated with servicing commercial loans guaranteed by the Small Business Administration and the United States Department of Agriculture that have been sold with servicing retained by HTLF. HTLF uses the amortization method (i.e., the lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, to determine the carrying value of its commercial servicing rights. The fair value for servicing assets is determined through market prices for comparable servicing contracts, when available, or through a valuation model that calculates the present value of estimated future net servicing income. Inputs utilized include discount rates, prepayment speeds and delinquency rate assumptions as inputs. All of these assumptions require a significant degree of management estimation and judgment. Commercial servicing rights are subject to impairment testing, and the carrying values of these rights are reviewed quarterly for impairment based upon the calculation of fair value as performed by an outside third party. If the valuation model reflects a fair value less than the carrying value, commercial servicing rights are adjusted to fair value through a valuation allowance. HTLF classifies commercial servicing rights as nonrecurring with Level 3 measurement inputs. Derivative Financial Instruments HTLF's current interest rate risk strategy includes 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 as 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, 2021, and December 31, 2020, 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. Interest rate lock commitments HTLF uses an internal valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments which is based on unobservable inputs that reflect management's assumptions and specific information about each borrower. Interest rate lock commitments are classified in Level 3 of the fair value hierarchy. Forward commitments The fair value of forward commitments are estimated using an internal valuation model, which includes current trade pricing for similar financial instruments in active markets that HTLF has the ability to access and 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.
Revenue Recognition	Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers, requires revenue to be recognized at an amount that reflects the consideration to which HTLF expects to be entitled in exchange for transferring goods or services to a customer. ASC 606 applies to all contracts with customers to provide goods or services in the ordinary course of business, except for contracts that are specifically excluded from its scope. The majority of HTLF's revenue streams including interest income, loan servicing income, net securities gain, net unrealized gains and losses on equity securities, net gains on sale of loans held for sale, valuation adjustment on servicing rights, income from bank owned life insurance and other noninterest income are outside the scope of ASC 606. Revenue streams including service charges and fees, interchange fees on credit and debit cards, trust fees and brokerage and insurance commissions are within the scope of ASC 606. Service Charges and Fees Service charges and fees consist of revenue generated from deposit account related service charges and fees, overdraft fees, customer service fees and other service charges, credit card fee income, debit card income and other service charges and fees. Service charges on deposit accounts consist of account analysis fees (i.e., net fees earned on analyzed business and public checking accounts), monthly service fees, check orders and other deposit account related fees. HTLF's performance obligation for account analysis fees and monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Check orders and other deposit account related fees, including overdraft fees, are largely transaction based, and therefore, the performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. Customer service fees and other service charges include revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. HTLF's performance obligation for fees, exchange, and other service charges are largely satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month. Credit card fee income and debit card income are comprised of interchange fees, ATM fees, and merchant services income. Credit card fee income and debit card income are earned whenever the banks' debit and credit cards are processed through card payment networks such as Visa. ATM fees are primarily generated when a bank cardholder uses an ATM that is not owned by one of HTLF's banks or a non-bank cardholder uses a HTLF-owned ATM. Merchant services income mainly represents fees charged to merchants to process their debit and credit card transactions, in addition to account management fees. Trust Fees Trust fees are primarily comprised of fees earned from the management and administration of trusts and other customer assets. HTLF's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the average daily market value or month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days before or after month end through a direct charge to customers’ accounts. HTLF does not earn performance-based incentives. Optional services such as real estate sales and tax return preparation services are also available to existing trust and asset management customers. HTLF's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and Insurance Commissions Brokerage commission primarily consist of commissions related to broker-dealer contracts. The contracts are between the customer and the broker-dealer, and HTLF satisfies its performance obligation and earns commission when the transactions are completed. The recognition of revenue is based on a defined fee schedule and does not require significant judgment. Payment is received shortly after services are rendered. Insurance commissions are related to commissions received directly from the insurance carrier. HTLF acts as an insurance agent between the customer and the insurance carrier. HTLF's performance obligations and associated fee and commission income are defined with each insurance product with the insurance company. When insurance payments are received from customers, a portion of the payment is recognized as commission revenue.

BASIS OF PRESENTATION (Tables)

BASIS OF PRESENTATION (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021, and 2020, are shown in the table below: Three Months Ended (Dollars and number of shares in thousands, except per share data) 2021 2020 Net income $ 52,814 $ 20,040 Preferred dividends (2,013) — Net income available to stockholders $ 50,801 $ 20,040 Weighted average common shares outstanding for basic earnings per share 42,174 36,821 Assumed incremental common shares issued upon vesting of outstanding restricted stock units 162 75 Weighted average common shares for diluted earnings per share 42,336 36,896 Earnings per common share — basic $ 1.20 $ 0.54 Earnings per common share — diluted $ 1.20 $ 0.54 Number of antidilutive common stock equivalents excluded from diluted earnings per share computation 25 —

SECURITIES (Tables)

SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021, and December 31, 2020, are summarized in the table below, in thousands: Amortized Gross Gross Estimated March 31, 2021 U.S. treasuries $ 995 $ 24 $ — $ 1,019 U.S. agencies 212,805 1,222 (1,735) 212,292 Obligations of states and political subdivisions 1,737,638 41,460 (41,109) 1,737,989 Mortgage-backed securities - agency 1,442,422 19,675 (29,168) 1,432,929 Mortgage-backed securities - non-agency 1,490,868 14,957 (2,109) 1,503,716 Commercial mortgage-backed securities - agency 123,797 2,150 (3,717) 122,230 Commercial mortgage-backed securities - non-agency 307,744 272 (242) 307,774 Asset-backed securities 1,017,016 12,837 (1,640) 1,028,213 Corporate bonds 3,754 64 (28) 3,790 Total debt securities 6,337,039 92,661 (79,748) 6,349,952 Equity securities with a readily determinable fair value 20,543 — — 20,543 Total $ 6,357,582 $ 92,661 $ (79,748) $ 6,370,495 December 31, 2020 U.S. treasuries $ 1,995 $ 31 $ — $ 2,026 U.S. agencies 167,048 657 (926) 166,779 Obligations of states and political subdivisions 1,562,631 75,555 (2,959) 1,635,227 Mortgage-backed securities - agency 1,351,964 16,029 (12,723) 1,355,270 Mortgage-backed securities - non-agency 1,428,068 22,688 (1,640) 1,449,116 Commercial mortgage-backed securities - agency 171,451 3,440 (738) 174,153 Commercial mortgage-backed securities - non-agency 253,421 37 (691) 252,767 Asset-backed securities 1,064,255 9,421 (4,410) 1,069,266 Corporate bonds 3,763 8 (29) 3,742 Total debt securities 6,004,596 127,866 (24,116) 6,108,346 Equity securities with a readily determinable fair value 19,629 — — 19,629 Total $ 6,024,225 $ 127,866 $ (24,116) $ 6,127,975
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, 2021, and December 31, 2020, are summarized in the table below, in thousands: Amortized Gross Gross Estimated Allowance for Credit Losses March 31, 2021 Obligations of states and political subdivisions $ 85,341 $ 9,741 $ — $ 95,082 $ (48) Total $ 85,341 $ 9,741 $ — $ 95,082 $ (48) December 31, 2020 Obligations of states and political subdivisions $ 88,890 $ 11,151 $ — $ 100,041 $ (51) Total $ 88,890 $ 11,151 $ — $ 100,041 $ (51)
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of investment securities carried at fair value at March 31, 2021, 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, 2021 Amortized Cost Estimated Fair Value Due in 1 year or less $ 2,839 $ 2,873 Due in 1 to 5 years 30,793 31,575 Due in 5 to 10 years 250,514 250,981 Due after 10 years 1,671,046 1,669,661 Total debt securities 1,955,192 1,955,090 Mortgage and asset-backed securities 4,381,847 4,394,862 Equity securities with a readily determinable fair value 20,543 20,543 Total investment securities $ 6,357,582 $ 6,370,495 The amortized cost and estimated fair value of debt securities held to maturity at March 31, 2021, 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, 2021 Amortized Cost Estimated Fair Value Due in 1 year or less $ 2,008 $ 2,028 Due in 1 to 5 years 23,461 25,067 Due in 5 to 10 years 51,288 56,258 Due after 10 years 8,584 11,729 Total debt securities 85,341 95,082 Allowance for credit losses (48) — Total investment securities $ 85,293 $ 95,082
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, 2021 and 2020, are summarized as follows, in thousands: Three Months Ended 2021 2020 Proceeds from sales $ 207,067 $ 328,890 Gross security gains 445 2,904 Gross security losses 475 1,246
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, 2021, and December 31, 2020. 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, 2020, and December 31, 2019 , 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, 2021 U.S. treasuries $ — $ — — $ — $ — — $ — $ — — U.S. agencies 23,581 (997) 2 95,757 (738) 73 119,338 (1,735) 75 Obligations of states and political subdivisions 1,000,647 (40,997) 169 13,126 (112) 2 1,013,773 (41,109) 171 Mortgage-backed securities - agency 774,060 (28,762) 51 27,063 (406) 2 801,123 (29,168) 53 Mortgage-backed securities - non-agency 568,107 (1,801) 18 30,172 (308) 5 598,279 (2,109) 23 Commercial mortgage-backed securities - agency 72,262 (3,717) 11 — — — 72,262 (3,717) 11 Commercial mortgage-backed securities - non-agency 57,789 (6) 1 34,659 (236) 4 92,448 (242) 5 Asset-backed securities 128,354 (533) 6 88,892 (1,107) 12 217,246 (1,640) 18 Corporate bonds 1,714 (28) 4 — — — 1,714 (28) 4 Total temporarily impaired securities $ 2,626,514 $ (76,841) 262 $ 289,669 $ (2,907) 98 $ 2,916,183 $ (79,748) 360 December 31, 2020 U.S. treasuries $ — $ — — $ — $ — — $ — $ — — U.S. agencies 2,981 (8) 5 99,922 (918) 72 102,903 (926) 77 Obligations of states and political subdivisions 346,598 (2,959) 49 — — — 346,598 (2,959) 49 Mortgage-backed securities - agency 653,793 (12,342) 35 31,012 (381) 3 684,805 (12,723) 38 Mortgage-backed securities - non-agency 378,843 (1,639) 17 1,622 (1) 1 380,465 (1,640) 18 Commercial mortgage-backed securities - agency 46,541 (738) 6 — — — 46,541 (738) 6 Commercial mortgage-backed securities - non-agency 100,042 (15) 2 35,428 (676) 3 135,470 (691) 5 Asset-backed securities 141,824 (643) 9 340,452 (3,767) 24 482,276 (4,410) 33 Corporate bonds 1,908 (29) 4 — — — 1,908 (29) 4 Total temporarily impaired securities $ 1,672,530 $ (18,373) 127 $ 508,436 $ (5,743) 103 $ 2,180,966 $ (24,116) 230
Schedule of Debt Securities, Held-to-maturity, Allowance for Credit Loss	The following table presents, in thousands, the activity in the allowance for credit losses for securities held to maturity by obligations of states and political subdivisions securities for the three months ended March 31, 2021 and 2020: Three Months Ended 2021 2020 Beginning balance $ 51 $ — Impact of ASU 2016-13 adoption — 158 Adjusted balance 51 158 Provision (benefit) for credit losses (3) 39 Balance at period end $ 48 $ 197
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, 2021 and 2020, which are updated quarterly and used to monitor the credit quality of the securities: March 31, 2021 December 31, 2020 Rating AAA $ 3,178 $ — AA, AA+, AA- 61,816 64,385 A+, A, A- 15,150 18,353 BBB 4,729 4,208 Not Rated 468 1,944 Total $ 85,341 $ 88,890 The following tables show the risk category of loans by loan category and year of origination as of March 31, 2021, and December 31, 2020, in thousands: As of March 31, 2021 Amortized Cost Basis of Term Loans by Year of Origination 2021 2020 2019 2018 2017 2016 and Prior Revolving Total Commercial and industrial Pass $ 85,059 $ 523,968 $ 305,803 $ 142,927 $ 206,293 $ 386,530 $ 481,837 $ 2,132,417 Watch 1,213 31,058 23,144 19,494 15,308 21,877 78,657 190,751 Substandard 825 24,203 10,191 8,278 11,890 26,002 16,703 98,092 Commercial and industrial total $ 87,097 $ 579,229 $ 339,138 $ 170,699 $ 233,491 $ 434,409 $ 577,197 $ 2,421,260 PPP Pass $ 400,126 $ 671,099 $ — $ — $ — $ — $ — $ 1,071,225 Watch 9,625 20,344 — — — — — 29,969 Substandard 5,750 48,384 — — — — — 54,134 PPP total $ 415,501 $ 739,827 $ — $ — $ — $ — $ — $ 1,155,328 Owner occupied commercial real estate Pass $ 97,898 $ 415,729 $ 387,953 $ 271,720 $ 152,313 $ 289,744 $ 36,676 $ 1,652,033 Watch 768 16,775 22,063 22,059 20,427 19,212 7,131 108,435 Substandard 1,907 14,332 7,797 10,340 12,830 28,937 948 77,091 Owner occupied commercial real estate total $ 100,573 $ 446,836 $ 417,813 $ 304,119 $ 185,570 $ 337,893 $ 44,755 $ 1,837,559 Non-owner occupied commercial real estate Pass $ 94,856 $ 334,303 $ 379,230 $ 297,195 $ 181,937 $ 307,473 $ 20,154 $ 1,615,148 Watch — 20,932 91,095 31,107 20,494 67,914 5,013 236,555 Substandard 2,140 30,469 14,010 23,383 14,853 30,625 — 115,480 Non-owner occupied commercial real estate total $ 96,996 $ 385,704 $ 484,335 $ 351,685 $ 217,284 $ 406,012 $ 25,167 $ 1,967,183 Real estate construction Pass $ 66,643 $ 342,374 $ 229,345 $ 54,006 $ 10,730 $ 9,485 $ 18,588 $ 731,171 Watch — 2,832 11,164 47,532 317 25 414 62,284 Substandard 158 — 28 1,995 — 391 — 2,572 Real estate construction total $ 66,801 $ 345,206 $ 240,537 $ 103,533 $ 11,047 $ 9,901 $ 19,002 $ 796,027 Agricultural and agricultural real estate Pass $ 56,474 $ 149,863 $ 81,301 $ 49,483 $ 32,928 $ 49,165 $ 132,606 $ 551,820 Watch 1,268 17,561 12,753 6,863 1,636 6,667 10,136 56,884 Substandard 6,686 13,163 6,943 22,012 5,855 12,370 8,236 75,265 Agricultural and agricultural real estate total $ 64,428 $ 180,587 $ 100,997 $ 78,358 $ 40,419 $ 68,202 $ 150,978 $ 683,969 Residential real estate Pass $ 46,700 $ 125,274 $ 80,624 $ 95,884 $ 64,961 $ 312,167 $ 26,634 $ 752,244 Watch 1,188 1,989 1,676 2,067 1,620 8,062 — 16,602 Substandard 4,324 947 201 2,073 1,410 8,393 800 18,148 Residential real estate total $ 52,212 $ 128,210 $ 82,501 $ 100,024 $ 67,991 $ 328,622 $ 27,434 $ 786,994 Consumer Pass $ 17,483 $ 32,613 $ 23,111 $ 16,259 $ 13,336 $ 22,480 $ 266,620 $ 391,902 Watch 29 104 361 840 324 708 1,455 3,821 Substandard — 546 739 1,423 386 2,499 820 6,413 Consumer total $ 17,512 $ 33,263 $ 24,211 $ 18,522 $ 14,046 $ 25,687 $ 268,895 $ 402,136 Total Pass $ 865,239 $ 2,595,223 $ 1,487,367 $ 927,474 $ 662,498 $ 1,377,044 $ 983,115 $ 8,897,960 Total Watch 14,091 111,595 162,256 129,962 60,126 124,465 102,806 705,301 Total Substandard 21,790 132,044 39,909 69,504 47,224 109,217 27,507 447,195 Total Loans $ 901,120 $ 2,838,862 $ 1,689,532 $ 1,126,940 $ 769,848 $ 1,610,726 $ 1,113,428 $ 10,050,456 As of December 31, 2020 Amortized Cost Basis of Term Loans by Year of Origination 2020 2019 2018 2017 2016 2015 and Prior Revolving Total Commercial and industrial Pass $ 557,853 $ 340,809 $ 168,873 $ 215,696 $ 101,010 $ 337,834 $ 541,627 $ 2,263,702 Watch 41,574 24,676 19,672 14,262 8,072 2,474 49,432 160,162 Substandard 23,024 16,274 8,897 15,717 9,098 19,537 18,388 110,935 Commercial and industrial total $ 622,451 $ 381,759 $ 197,442 $ 245,675 $ 118,180 $ 359,845 $ 609,447 $ 2,534,799 PPP Pass $ 880,709 $ — $ — $ — $ — $ — $ — $ 880,709 Watch 22,533 — — — — — — 22,533 Substandard 54,543 — — — — — — 54,543 PPP total $ 957,785 $ — $ — $ — $ — $ — $ — $ 957,785 Owner occupied commercial real estate Pass $ 400,662 $ 369,401 $ 300,242 $ 167,470 $ 107,234 $ 213,780 $ 33,759 $ 1,592,548 Watch 15,345 13,764 22,488 20,811 8,717 15,282 4,311 100,718 Substandard 15,914 9,522 12,164 14,147 8,580 21,708 1,105 83,140 Owner occupied commercial real estate total $ 431,921 $ 392,687 $ 334,894 $ 202,428 $ 124,531 $ 250,770 $ 39,175 $ 1,776,406 Non-owner occupied commercial real estate Pass $ 334,722 $ 411,301 $ 305,456 $ 194,101 $ 108,070 $ 233,153 $ 24,466 $ 1,611,269 Watch 22,826 55,225 24,718 18,724 20,954 45,672 5,114 193,233 Substandard 30,899 15,035 23,290 17,046 9,147 21,060 502 116,979 Non-owner occupied commercial real estate total $ 388,447 $ 481,561 $ 353,464 $ 229,871 $ 138,171 $ 299,885 $ 30,082 $ 1,921,481 Real estate construction Pass $ 311,625 $ 309,678 $ 157,171 $ 12,625 $ 6,954 $ 5,110 $ 21,431 $ 824,594 Watch 2,105 26,659 2,403 332 55 388 1,295 33,237 Substandard 196 2,760 2,036 — 39 358 — 5,389 Real estate construction total $ 313,926 $ 339,097 $ 161,610 $ 12,957 $ 7,048 $ 5,856 $ 22,726 $ 863,220 Agricultural and agricultural real estate Pass $ 171,578 $ 90,944 $ 62,349 $ 39,252 $ 17,626 $ 37,696 $ 148,456 $ 567,901 Watch 20,500 16,202 8,854 2,448 3,515 3,157 12,282 66,958 Substandard 17,403 7,044 23,519 6,758 3,917 9,952 11,074 79,667 Agricultural and agricultural real estate total $ 209,481 $ 114,190 $ 94,722 $ 48,458 $ 25,058 $ 50,805 $ 171,812 $ 714,526 Residential real estate Pass $ 153,017 $ 99,440 $ 118,854 $ 83,534 $ 63,477 $ 244,852 $ 33,467 $ 796,641 Watch 3,986 4,507 2,188 1,896 3,117 8,525 — 24,219 Substandard 980 442 2,507 1,528 884 12,141 1,100 19,582 Residential real estate total $ 157,983 $ 104,389 $ 123,549 $ 86,958 $ 67,478 $ 265,518 $ 34,567 $ 840,442 Consumer Pass $ 37,037 $ 27,646 $ 18,811 $ 15,034 $ 4,009 $ 19,483 $ 280,996 $ 403,016 Watch 168 352 647 340 82 646 1,622 3,857 Substandard 481 959 1,884 500 897 1,976 822 7,519 Consumer total $ 37,686 $ 28,957 $ 21,342 $ 15,874 $ 4,988 $ 22,105 $ 283,440 $ 414,392 Total Pass $ 2,847,203 $ 1,649,219 $ 1,131,756 $ 727,712 $ 408,380 $ 1,091,908 $ 1,084,202 $ 8,940,380 Total Watch 129,037 141,385 80,970 58,813 44,512 76,144 74,056 604,917 Total Substandard 143,440 52,036 74,297 55,696 32,562 86,732 32,991 477,754 Total Loans $ 3,119,680 $ 1,842,640 $ 1,287,023 $ 842,221 $ 485,454 $ 1,254,784 $ 1,191,249 $ 10,023,051

LOANS (Tables)

LOANS (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Schedule of Loans	Loans as of March 31, 2021, and December 31, 2020, were as follows, in thousands: March 31, 2021 December 31, 2020 Loans receivable held to maturity: Commercial and industrial $ 2,421,260 $ 2,534,799 Paycheck Protection Program ("PPP") 1,155,328 957,785 Owner occupied commercial real estate 1,837,559 1,776,406 Non-owner occupied commercial real estate 1,967,183 1,921,481 Real estate construction 796,027 863,220 Agricultural and agricultural real estate 683,969 714,526 Residential real estate 786,994 840,442 Consumer 402,136 414,392 Total loans receivable held to maturity 10,050,456 10,023,051 Allowance for credit losses (130,172) (131,606) Loans receivable, net $ 9,920,284 $ 9,891,445
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, 2021, and December 31, 2020, and the related loan balances, disaggregated on the basis of measurement methodology, in thousands. Individually assessed loans are collateral dependent and in the process of foreclosure or no longer share the same risk characteristics of the other loans in the pool. 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, 2021 Commercial and industrial $ 3,433 $ 32,662 $ 36,095 $ 14,560 $ 2,406,700 $ 2,421,260 PPP — — — — 1,155,328 1,155,328 Owner occupied commercial real estate 110 19,306 19,416 10,720 1,826,839 1,837,559 Non-owner occupied commercial real estate 5,873 18,821 24,694 22,655 1,944,528 1,967,183 Real estate construction — 19,931 19,931 — 796,027 796,027 Agricultural and agricultural real estate 2,481 4,630 7,111 14,926 669,043 683,969 Residential real estate — 11,012 11,012 129 786,865 786,994 Consumer — 11,913 11,913 — 402,136 402,136 Total $ 11,897 $ 118,275 $ 130,172 $ 62,990 $ 9,987,466 $ 10,050,456 December 31, 2020 Commercial and industrial $ 4,077 $ 34,741 $ 38,818 $ 16,578 $ 2,518,221 $ 2,534,799 PPP — — — — 957,785 957,785 Owner occupied commercial real estate 111 19,890 20,001 11,174 1,765,232 1,776,406 Non-owner occupied commercial real estate 3,250 17,623 20,873 13,490 1,907,991 1,921,481 Real estate construction — 20,080 20,080 — 863,220 863,220 Agricultural and agricultural real estate 1,988 5,141 7,129 15,453 699,073 714,526 Residential real estate — 11,935 11,935 535 839,907 840,442 Consumer — 12,770 12,770 — 414,392 414,392 Total $ 9,426 $ 122,180 $ 131,606 $ 57,230 $ 9,965,821 $ 10,023,051
Troubled Debt Restructuring on Loans Modified	The following tables provide information on troubled debt restructured loans that were modified during the three months ended March 31, 2021, and March 31, 2020, dollars in thousands: Three Months Ended Three Months Ended 2021 2020 Number Pre- Post- Number Pre- Post- Commercial and industrial — $ — $ — — $ — $ — PPP — — — — — — Owner occupied commercial real estate — — — — — — Non-owner occupied commercial real estate — — — — — — Real estate construction — — — — — — Agricultural and agricultural real estate — — — — — — Residential real estate — — — 1 32 32 Consumer — — — — — — Total — $ — $ — 1 $ 32 $ 32
Troubled Debt Restructuring on Loans With Payment Defaults	The following table shows troubled debt restructured loans for which there was a payment default during the three months ended March 31, 2021, and March 31, 2020, that had been modified during the twelve-month period prior to default, in thousands: With Payment Defaults During the Three Months Ended March 31, 2021 2020 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial and industrial — $ — — $ — PPP — — — — Owner occupied commercial real estate — — — — Non-owner occupied commercial real estate — — — — Real estate construction — — — — Agricultural and agricultural real estate — — — — Residential real estate — — 1 241 Consumer — — — — Total — $ — 1 $ 241
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, 2021 and 2020, which are updated quarterly and used to monitor the credit quality of the securities: March 31, 2021 December 31, 2020 Rating AAA $ 3,178 $ — AA, AA+, AA- 61,816 64,385 A+, A, A- 15,150 18,353 BBB 4,729 4,208 Not Rated 468 1,944 Total $ 85,341 $ 88,890 The following tables show the risk category of loans by loan category and year of origination as of March 31, 2021, and December 31, 2020, in thousands: As of March 31, 2021 Amortized Cost Basis of Term Loans by Year of Origination 2021 2020 2019 2018 2017 2016 and Prior Revolving Total Commercial and industrial Pass $ 85,059 $ 523,968 $ 305,803 $ 142,927 $ 206,293 $ 386,530 $ 481,837 $ 2,132,417 Watch 1,213 31,058 23,144 19,494 15,308 21,877 78,657 190,751 Substandard 825 24,203 10,191 8,278 11,890 26,002 16,703 98,092 Commercial and industrial total $ 87,097 $ 579,229 $ 339,138 $ 170,699 $ 233,491 $ 434,409 $ 577,197 $ 2,421,260 PPP Pass $ 400,126 $ 671,099 $ — $ — $ — $ — $ — $ 1,071,225 Watch 9,625 20,344 — — — — — 29,969 Substandard 5,750 48,384 — — — — — 54,134 PPP total $ 415,501 $ 739,827 $ — $ — $ — $ — $ — $ 1,155,328 Owner occupied commercial real estate Pass $ 97,898 $ 415,729 $ 387,953 $ 271,720 $ 152,313 $ 289,744 $ 36,676 $ 1,652,033 Watch 768 16,775 22,063 22,059 20,427 19,212 7,131 108,435 Substandard 1,907 14,332 7,797 10,340 12,830 28,937 948 77,091 Owner occupied commercial real estate total $ 100,573 $ 446,836 $ 417,813 $ 304,119 $ 185,570 $ 337,893 $ 44,755 $ 1,837,559 Non-owner occupied commercial real estate Pass $ 94,856 $ 334,303 $ 379,230 $ 297,195 $ 181,937 $ 307,473 $ 20,154 $ 1,615,148 Watch — 20,932 91,095 31,107 20,494 67,914 5,013 236,555 Substandard 2,140 30,469 14,010 23,383 14,853 30,625 — 115,480 Non-owner occupied commercial real estate total $ 96,996 $ 385,704 $ 484,335 $ 351,685 $ 217,284 $ 406,012 $ 25,167 $ 1,967,183 Real estate construction Pass $ 66,643 $ 342,374 $ 229,345 $ 54,006 $ 10,730 $ 9,485 $ 18,588 $ 731,171 Watch — 2,832 11,164 47,532 317 25 414 62,284 Substandard 158 — 28 1,995 — 391 — 2,572 Real estate construction total $ 66,801 $ 345,206 $ 240,537 $ 103,533 $ 11,047 $ 9,901 $ 19,002 $ 796,027 Agricultural and agricultural real estate Pass $ 56,474 $ 149,863 $ 81,301 $ 49,483 $ 32,928 $ 49,165 $ 132,606 $ 551,820 Watch 1,268 17,561 12,753 6,863 1,636 6,667 10,136 56,884 Substandard 6,686 13,163 6,943 22,012 5,855 12,370 8,236 75,265 Agricultural and agricultural real estate total $ 64,428 $ 180,587 $ 100,997 $ 78,358 $ 40,419 $ 68,202 $ 150,978 $ 683,969 Residential real estate Pass $ 46,700 $ 125,274 $ 80,624 $ 95,884 $ 64,961 $ 312,167 $ 26,634 $ 752,244 Watch 1,188 1,989 1,676 2,067 1,620 8,062 — 16,602 Substandard 4,324 947 201 2,073 1,410 8,393 800 18,148 Residential real estate total $ 52,212 $ 128,210 $ 82,501 $ 100,024 $ 67,991 $ 328,622 $ 27,434 $ 786,994 Consumer Pass $ 17,483 $ 32,613 $ 23,111 $ 16,259 $ 13,336 $ 22,480 $ 266,620 $ 391,902 Watch 29 104 361 840 324 708 1,455 3,821 Substandard — 546 739 1,423 386 2,499 820 6,413 Consumer total $ 17,512 $ 33,263 $ 24,211 $ 18,522 $ 14,046 $ 25,687 $ 268,895 $ 402,136 Total Pass $ 865,239 $ 2,595,223 $ 1,487,367 $ 927,474 $ 662,498 $ 1,377,044 $ 983,115 $ 8,897,960 Total Watch 14,091 111,595 162,256 129,962 60,126 124,465 102,806 705,301 Total Substandard 21,790 132,044 39,909 69,504 47,224 109,217 27,507 447,195 Total Loans $ 901,120 $ 2,838,862 $ 1,689,532 $ 1,126,940 $ 769,848 $ 1,610,726 $ 1,113,428 $ 10,050,456 As of December 31, 2020 Amortized Cost Basis of Term Loans by Year of Origination 2020 2019 2018 2017 2016 2015 and Prior Revolving Total Commercial and industrial Pass $ 557,853 $ 340,809 $ 168,873 $ 215,696 $ 101,010 $ 337,834 $ 541,627 $ 2,263,702 Watch 41,574 24,676 19,672 14,262 8,072 2,474 49,432 160,162 Substandard 23,024 16,274 8,897 15,717 9,098 19,537 18,388 110,935 Commercial and industrial total $ 622,451 $ 381,759 $ 197,442 $ 245,675 $ 118,180 $ 359,845 $ 609,447 $ 2,534,799 PPP Pass $ 880,709 $ — $ — $ — $ — $ — $ — $ 880,709 Watch 22,533 — — — — — — 22,533 Substandard 54,543 — — — — — — 54,543 PPP total $ 957,785 $ — $ — $ — $ — $ — $ — $ 957,785 Owner occupied commercial real estate Pass $ 400,662 $ 369,401 $ 300,242 $ 167,470 $ 107,234 $ 213,780 $ 33,759 $ 1,592,548 Watch 15,345 13,764 22,488 20,811 8,717 15,282 4,311 100,718 Substandard 15,914 9,522 12,164 14,147 8,580 21,708 1,105 83,140 Owner occupied commercial real estate total $ 431,921 $ 392,687 $ 334,894 $ 202,428 $ 124,531 $ 250,770 $ 39,175 $ 1,776,406 Non-owner occupied commercial real estate Pass $ 334,722 $ 411,301 $ 305,456 $ 194,101 $ 108,070 $ 233,153 $ 24,466 $ 1,611,269 Watch 22,826 55,225 24,718 18,724 20,954 45,672 5,114 193,233 Substandard 30,899 15,035 23,290 17,046 9,147 21,060 502 116,979 Non-owner occupied commercial real estate total $ 388,447 $ 481,561 $ 353,464 $ 229,871 $ 138,171 $ 299,885 $ 30,082 $ 1,921,481 Real estate construction Pass $ 311,625 $ 309,678 $ 157,171 $ 12,625 $ 6,954 $ 5,110 $ 21,431 $ 824,594 Watch 2,105 26,659 2,403 332 55 388 1,295 33,237 Substandard 196 2,760 2,036 — 39 358 — 5,389 Real estate construction total $ 313,926 $ 339,097 $ 161,610 $ 12,957 $ 7,048 $ 5,856 $ 22,726 $ 863,220 Agricultural and agricultural real estate Pass $ 171,578 $ 90,944 $ 62,349 $ 39,252 $ 17,626 $ 37,696 $ 148,456 $ 567,901 Watch 20,500 16,202 8,854 2,448 3,515 3,157 12,282 66,958 Substandard 17,403 7,044 23,519 6,758 3,917 9,952 11,074 79,667 Agricultural and agricultural real estate total $ 209,481 $ 114,190 $ 94,722 $ 48,458 $ 25,058 $ 50,805 $ 171,812 $ 714,526 Residential real estate Pass $ 153,017 $ 99,440 $ 118,854 $ 83,534 $ 63,477 $ 244,852 $ 33,467 $ 796,641 Watch 3,986 4,507 2,188 1,896 3,117 8,525 — 24,219 Substandard 980 442 2,507 1,528 884 12,141 1,100 19,582 Residential real estate total $ 157,983 $ 104,389 $ 123,549 $ 86,958 $ 67,478 $ 265,518 $ 34,567 $ 840,442 Consumer Pass $ 37,037 $ 27,646 $ 18,811 $ 15,034 $ 4,009 $ 19,483 $ 280,996 $ 403,016 Watch 168 352 647 340 82 646 1,622 3,857 Substandard 481 959 1,884 500 897 1,976 822 7,519 Consumer total $ 37,686 $ 28,957 $ 21,342 $ 15,874 $ 4,988 $ 22,105 $ 283,440 $ 414,392 Total Pass $ 2,847,203 $ 1,649,219 $ 1,131,756 $ 727,712 $ 408,380 $ 1,091,908 $ 1,084,202 $ 8,940,380 Total Watch 129,037 141,385 80,970 58,813 44,512 76,144 74,056 604,917 Total Substandard 143,440 52,036 74,297 55,696 32,562 86,732 32,991 477,754 Total Loans $ 3,119,680 $ 1,842,640 $ 1,287,023 $ 842,221 $ 485,454 $ 1,254,784 $ 1,191,249 $ 10,023,051
Past Due Financing Receivables	The following table sets forth information regarding accruing and nonaccrual loans at March 31, 2021, and December 31, 2020, in thousands: Accruing Loans 30-59 Days 60-89 Days 90 Days or Total Current Nonaccrual Total Loans March 31, 2021 Commercial and industrial $ 3,632 $ 219 $ 49 $ 3,900 $ 2,397,518 $ 19,842 $ 2,421,260 PPP — — — — 1,155,328 — 1,155,328 Owner occupied commercial real estate 519 — — 519 1,824,298 12,742 1,837,559 Non-owner occupied commercial real estate 4,174 584 — 4,758 1,938,728 23,697 1,967,183 Real estate construction 393 — — 393 795,057 577 796,027 Agricultural and agricultural real estate 830 5 — 835 665,069 18,065 683,969 Residential real estate 4,088 1,101 122 5,311 768,401 13,282 786,994 Consumer 525 86 — 611 398,012 3,513 402,136 Total gross loans receivable held to maturity $ 14,161 $ 1,995 $ 171 $ 16,327 $ 9,942,411 $ 91,718 $ 10,050,456 December 31, 2020 Commercial and industrial $ 5,825 $ 2,322 $ 720 $ 8,867 $ 2,504,170 $ 21,762 $ 2,534,799 PPP 1 — — 1 957,784 — 957,785 Owner occupied commercial real estate 2,815 167 — 2,982 1,759,649 13,775 1,776,406 Non-owner occupied commercial real estate 2,143 2,674 — 4,817 1,902,003 14,661 1,921,481 Real estate construction 2,446 96 — 2,542 859,784 894 863,220 Agricultural and agricultural real estate 1,688 — — 1,688 694,150 18,688 714,526 Residential real estate 1,675 83 — 1,758 825,047 13,637 840,442 Consumer 807 139 — 946 409,477 3,969 414,392 Total gross loans receivable held to maturity $ 17,400 $ 5,481 $ 720 $ 23,601 $ 9,912,064 $ 87,386 $ 10,023,051

ALLOWANCE FOR CREDIT LOSSES (Ta

ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2021
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, 2021, and March 31, 2020, were as follows, in thousands: Commercial PPP Owner Occupied Commercial Real Estate Non-Owner Occupied Commercial Real Estate Real Estate Construction Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2020 $ 38,818 $ — $ 20,001 $ 20,873 $ 20,080 $ 7,129 $ 11,935 $ 12,770 $ 131,606 Charge-offs (948) — (41) — — (318) (21) (798) (2,126) Recoveries 293 — 53 — 2 21 5 302 676 Provision (2,068) — (597) 3,821 (151) 279 (907) (361) 16 Balance at March 31, 2021 $ 36,095 $ — $ 19,416 $ 24,694 $ 19,931 $ 7,111 $ 11,012 $ 11,913 $ 130,172 Commercial PPP Owner Occupied Commercial Real Estate Non-Owner Occupied Commercial Real Estate Real Estate Construction Agricultural and Agricultural Residential Consumer Total Balance at December 31, 2019 $ 34,207 $ — $ 7,921 $ 7,584 $ 8,677 $ 5,680 $ 1,504 $ 4,822 $ 70,395 Impact of ASU 2016-13 adoption (272) — (114) (2,617) 6,335 (387) 4,817 4,309 12,071 Adjusted balance at January 1, 2020 33,935 — 7,807 4,967 15,012 5,293 6,321 9,131 82,466 Charge-offs (5,230) — — (21) (253) (79) (717) (6,300) Recoveries 264 — 1 — 5 826 3 220 1,319 Provision 3,486 — 2,529 3,353 7,955 (1,069) 2,480 1,131 19,865 Balance at March 31, 2020 $ 32,455 $ — $ 10,337 $ 8,320 $ 22,951 $ 4,797 $ 8,725 $ 9,765 $ 97,350
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Changes in the allowance for credit losses on unfunded commitments for the three months ended March 31, 2021 and March 31, 2020, were as follows: Balance at December 31, 2020 $ 15,280 Provision (661) Balance at March 31, 2021 $ 14,619 Balance at December 31, 2019 $ 248 Impact of ASU 2016-13 adoption on January 1, 2020 13,604 Adjusted balance at January 1, 2020 13,852 Provision 1,616 Balance at March 31, 2020 $ 15,468

GOODWILL, CORE DEPOSIT PREMIU_2

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Tables)	3 Months Ended
	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets	The gross carrying amount of these intangible assets and the associated accumulated amortization at March 31, 2021, and December 31, 2020, are presented in the table below, in thousands: March 31, 2021 December 31, 2020 Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets: Core deposit intangibles $ 101,185 $ 61,477 $ 39,708 $ 101,185 $ 58,970 $ 42,215 Customer relationship intangibles 1,177 1,018 159 1,177 1,009 168 Mortgage servicing rights 11,781 5,563 6,218 11,268 6,079 5,189 Commercial servicing rights 7,054 6,319 735 7,054 6,191 863 Total $ 121,197 $ 74,377 $ 46,820 $ 120,684 $ 72,249 $ 48,435
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 Customer Mortgage Commercial Nine months ending December 31, 2021 $ 6,852 $ 27 $ 1,201 $ 177 $ 8,257 Year ending December 31, 2022 7,702 34 1,254 207 9,197 2023 6,739 33 1,075 149 7,996 2024 5,591 33 896 98 6,618 2025 4,700 32 717 104 5,553 2026 3,533 — 538 — 4,071 Thereafter 4,591 — 537 — 5,128 Total $ 39,708 $ 159 $ 6,218 $ 735 $ 46,820
Schedule of Servicing Asset at Fair Value and Amortized Cost	The following table summarizes, in thousands, the book value, the fair value of each tranche of the mortgage servicing rights and any recorded valuation allowance at each respective subsidiary at March 31, 2021, and December 31, 2020: March 31, 2021 Book Value 15-Year Tranche Fair Value 15-Year Tranche Valuation Allowance Book Value 30-Year Tranche Fair Value 30-Year Tranche Valuation Allowance First Bank & Trust $ 1,667 $ 1,266 $ 401 $ 6,380 $ 4,952 $ 1,428 December 31, 2020 First Bank & Trust $ 1,522 $ 1,100 $ 422 $ 5,445 $ 4,089 $ 1,356 The following table summarizes, in thousands, the book value, the fair value of each tranche of the commercial servicing rights and any recorded valuation allowance at each respective subsidiary at March 31, 2021, and December 31, 2020: Book Value Fair Value Valuation Allowance Book Value Fair Value Valuation Allowance March 31, 2021 $ 80 $ 230 $ — $ 655 $ 1,009 $ — December 31, 2020 $ 87 $ 203 $ — $ 776 $ 1,085 $ —
Mortgage servicing rights
Finite-Lived Intangible Assets [Line Items]
Summary of Changes in Servicing Rights	The following table summarizes, in thousands, the changes in capitalized mortgage servicing rights for the three months ended March 31, 2021, and March 31, 2020: 2021 2020 Balance at January 1, $ 5,189 $ 5,621 Originations 512 376 Amortization (400) (307) Sale of mortgage servicing rights — — Valuation adjustment 917 (1,565) Balance at period end $ 6,218 $ 4,125 Mortgage servicing rights, net to servicing portfolio 0.83 % 0.67 %
Commercial servicing rights
Finite-Lived Intangible Assets [Line Items]
Summary of Changes in Servicing Rights	The following table summarizes, in thousands, the changes in capitalized commercial servicing rights for the three months ended March 31, 2021, and March 31, 2020: 2021 2020 Balance at January 1, $ 863 $ 1,115 Originations — 38 Amortization (128) (58) Balance at period end $ 735 $ 1,095 Fair value of commercial servicing rights $ 1,239 $ 1,407 Commercial servicing rights, net to servicing portfolio 1.18 % 1.41 %

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance Sheet Category and Fair Values of Embedded Derivatives	The table below identifies the notional amount, fair value and balance sheet category of the embedded derivatives at March 31, 2021, and December 31, 2020, in thousands: Notional Amount Fair Value Balance Sheet Category March 31, 2021 Embedded derivatives $ 9,084 $ 551 Other assets December 31, 2020 Embedded derivatives $ 9,198 $ 680 Other assets The table below identifies the gains and losses recognized on HTLF's embedded derivatives for the three months ended March 31, 2021, and March 31, 2020, in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended March 31, 2021 Embedded derivatives $ (129) Other noninterest income Three Months Ended March 31, 2020 Embedded derivatives $ 361 Other noninterest income
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, 2021, and December 31, 2020, in thousands: Balance Sheet Category Notional Amount Fair Value March 31, 2021 Interest rate lock commitments (mortgage) Other assets $ 54,369 $ 1,857 Forward commitments Other assets 83,500 1,213 Forward commitments Other liabilities 2,000 (4) Undesignated interest rate swaps Other liabilities 9,084 (551) December 31, 2020 Interest rate lock commitments (mortgage) Other assets $ 42,078 $ 1,827 Forward commitments Other assets — — Forward commitments Other liabilities 86,500 (697) Undesignated interest rate swaps Other liabilities 9,198 (680) The table below identifies the income statement category of 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, 2021, and March 31, 2020, in thousands: Income Statement Category Gain (Loss) Recognized Three Months Ended March 31, 2021 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ (1,485) Forward commitments Net gains on sale of loans held for sale 1,906 Undesignated interest rate swaps Other noninterest income 129 Three Months Ended March 31, 2020 Interest rate lock commitments (mortgage) Net gains on sale of loans held for sale $ 1,698 Forward commitments Net gains on sale of loans held for sale (1,146) Undesignated interest rate swaps Other noninterest income (361)
Cash Flow Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance Sheet Category and Fair Values of Derivative Instruments	The table below identifies the balance sheet category and fair values of HTLF's derivative instruments designated as cash flow hedges at March 31, 2021, and December 31, 2020, in thousands: Notional Fair Balance Receive Weighted Maturity March 31, 2021 Interest rate swap $ 25,000 $ — Other liabilities — % — % 03/17/2021 Interest rate swap 20,667 (37) Other liabilities 2.606 3.674 05/10/2021 Interest rate swap 22,000 (1,669) Other liabilities 2.607 5.425 07/24/2028 Interest rate swap 20,000 (1,194) Other liabilities 0.184 2.390 06/15/2024 Interest rate swap 20,000 (1,144) Other liabilities 0.225 2.352 03/01/2024 Interest rate swap 6,000 (26) Other liabilities 0.184 1.866 06/15/2021 Interest rate swap 3,000 (13) Other liabilities 0.184 1.878 06/30/2021 December 31, 2020 Interest rate swap $ 25,000 $ (127) Other liabilities 0.229 % 2.255 % 03/17/2021 Interest rate swap 21,667 (91) Other liabilities 2.649 3.674 05/10/2021 Interest rate swap 22,750 (2,220) Other liabilities 2.643 5.425 07/24/2028 Interest rate swap 20,000 (1,482) Other liabilities 0.217 2.390 06/15/2024 Interest rate swap 20,000 (1,385) Other liabilities 0.225 2.352 03/01/2024 Interest rate swap 6,000 (50) Other liabilities 0.217 1.866 06/15/2021 Interest rate swap 3,000 (25) Other liabilities 0.241 1.878 06/30/2021
Gains (Losses) on Derivative Instruments	The table below identifies the gains and losses recognized on HTLF's derivative instruments designated as cash flow hedges for the three months ended March 31, 2021, and March 31, 2020, in thousands: Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Category Amount of Category Amount of Three Months Ended March 31, 2021 Interest rate swaps $ 1,297 Interest expense $ 591 Other income $ — Three Months Ended March 31, 2020 Interest rate swaps $ (3,863) Interest expense $ 183 Other income $ —
Fair value hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance Sheet Category and Fair Values of Derivative Instruments	The table below identifies the notional amount, fair value and balance sheet category of HTLF's fair value hedges at March 31, 2021, and December 31, 2020, in thousands: Notional Amount Fair Value Balance Sheet Category March 31, 2021 Fair value hedges $ 20,734 $ (1,717) Other liabilities December 31, 2020 Fair value hedges $ 20,841 $ (2,480) Other liabilities
Gains (Losses) on Derivative Instruments	The table below identifies the gains and losses recognized on HTLF's fair value hedges for the three months ended March 31, 2021, and March 31, 2020, in thousands: Amount of Gain (Loss) Income Statement Category Three Months Ended March 31, 2021 Fair value hedges $ 763 Interest income Three Months Ended March 31, 2020 Fair value hedges $ (1,677) Interest income
Loan Swap Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance Sheet Category and Fair Values of Derivative Instruments	The table below identifies the balance sheet category and fair values of the derivative instruments designated as loan swaps at March 31, 2021, and December 31, 2020, in thousands: Notional Fair Balance Sheet Weighted Weighted March 31, 2021 Customer interest rate swaps $ 444,056 $ 23,440 Other assets 4.51 % 2.48 % Customer interest rate swaps 444,056 (23,440) Other liabilities 2.48 4.51 December 31, 2020 Customer interest rate swaps $ 440,719 $ 43,422 Other assets 4.46 % 2.46 % Customer interest rate swaps 440,719 (43,422) Other liabilities 2.46 4.46

FAIR VALUE (Tables)

FAIR VALUE (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The table below presents HTLFs assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2021, and December 31, 2020, 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, 2021 Assets Securities available for sale U.S. treasuries $ 1,019 $ 1,019 $ — $ — U.S. agencies 212,292 — 212,292 — Obligations of states and political subdivisions 1,737,989 — 1,737,989 — Mortgage-backed securities - agency 1,432,929 — 1,432,929 — Mortgage-backed securities - non-agency 1,503,716 — 1,503,716 — Commercial mortgage-backed securities - agency 122,230 — 122,230 — Commercial mortgage-backed securities - non-agency 307,774 — 307,774 — Asset-backed securities 1,028,213 — 1,028,213 — Corporate bonds 3,790 — 3,790 — Equity securities with a readily determinable fair value 20,543 — 20,543 — Derivative financial instruments (1) 23,991 — 23,991 — Interest rate lock commitments 1,857 — — 1,857 Forward commitments 1,213 — 1,213 — Total assets at fair value $ 6,397,556 $ 1,019 $ 6,394,680 $ 1,857 Liabilities Derivative financial instruments (2) $ 29,791 $ — $ 29,791 $ — Forward commitments 4 — 4 — Total liabilities at fair value $ 29,795 $ — $ 29,795 $ — December 31, 2020 Assets Securities available for sale U.S. treasuries $ 2,026 $ 2,026 $ — $ — U.S. agencies 166,779 — 166,779 — Obligations of states and political subdivisions 1,635,227 — 1,635,227 — Mortgage-backed securities - agency 1,355,270 — 1,355,270 — Mortgage-backed securities - non-agency 1,449,116 — 1,449,116 — Commercial mortgage-backed securities - agency 174,153 — 174,153 — Commercial mortgage-backed securities - non-agency 252,767 — 252,767 — Asset-backed securities 1,069,266 — 1,069,266 — Corporate bonds 3,742 — 3,742 — Equity securities with a readily determinable fair value 19,629 — 19,629 — Derivative financial instruments (1) 44,102 — 44,102 — Interest rate lock commitments 1,827 — — 1,827 Total assets at fair value $ 6,173,904 $ 2,026 $ 6,170,051 $ 1,827 Liabilities Derivative financial instruments (2) $ 51,962 $ — $ 51,962 $ — Forward commitments 697 — 697 — Total liabilities at fair value $ 52,659 $ — $ 52,659 $ — (1) Includes embedded derivatives, back-to-back loan swaps and fair value hedges. (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps, embedded derivatives and free standing derivative instruments.
Fair Value Measurements, Nonrecurring	The tables below present HTLF's assets that are measured at fair value on a nonrecurring basis, in thousands: Fair Value Measurements at March 31, 2021 Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 10,621 $ — $ — $ 10,621 $ 859 Owner occupied commercial real estate 1,233 — — 1,233 — Non-owner occupied commercial real estate 12,050 — — 12,050 — Real estate construction — — — — — Agricultural and agricultural real estate 7,271 — — 7,271 — Total collateral dependent individually assessed loans $ 31,175 $ — $ — $ 31,175 $ 859 Loans held for sale $ 43,037 $ — $ 43,037 $ — $ (1,121) Other real estate owned 6,236 — — 6,236 (154) Premises, furniture and equipment held for sale 7,633 — — 7,633 — Servicing rights 6,218 — — 6,218 (917) Fair Value Measurements at Total Quoted Prices in Significant Other Significant Year-to- Collateral dependent individually assessed loans: Commercial and industrial $ 11,256 $ — $ — $ 11,256 $ 451 Owner occupied commercial real estate 5,874 — — 5,874 11,631 Non-owner occupied commercial real estate 4,907 — — 4,907 — Real estate construction — — — — — Agricultural and agricultural real estate 12,451 — — 12,451 — Total collateral dependent individually assessed loans $ 34,488 $ — $ — $ 34,488 $ 12,082 Loans held for sale $ 57,949 $ — $ 57,949 $ — $ (982) Other real estate owned 6,624 — — 6,624 1,044 Premises, furniture and equipment held for sale 6,499 — — 6,499 3,288 Servicing rights 5,189 — — 5,189 1,778
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 Interest rate lock commitments $ 1,857 Discounted cash flows Closing ratio 0-99% (88%) (1) Other real estate owned 6,236 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Servicing rights 6,218 Discounted cash flows Third party valuation (4) Premises, furniture and equipment held for sale 7,633 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Collateral dependent individually assessed loans: Commercial 10,621 Modified appraised value Third party appraisal (2) Appraisal discount 0-7% (3) Owner occupied commercial real estate 1,233 Modified appraised value Third party appraisal (2) Appraisal discount 0-12% (3) Non-owner occupied commercial real estate 12,050 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Agricultural and agricultural real estate 7,271 Modified appraised value Third party appraisal (2) Appraisal discount 0-9% (3) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) 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. (3) 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. (4) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups. Fair Value at Valuation Unobservable Range Interest rate lock commitments $ 1,827 Discounted cash flows Closing ratio 0-99% (86%) (1) Other real estate owned 6,624 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Servicing rights 5,189 Discounted cash flows Third party valuation (4) Premises, furniture and equipment held for sale 6,499 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Collateral dependent individually assessed loans: Commercial and industrial 11,256 Modified appraised value Third party appraisal (2) Appraisal discount 0-8% (3) Owner occupied commercial real estate 5,874 Modified appraised value Third party appraisal (2) Appraisal discount 0-12% (3) Non-owner occupied commercial real estate 4,907 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) Agricultural and agricultural real estate 12,451 Modified appraised value Third party appraisal (2) Appraisal discount 0-10% (3) (1) The significant unobservable input used in the fair value measurement is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data. (2) 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. (3) 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. (4) The significant unobservable input used in the fair value measurement are the value indices, which are weighted-average spreads to LIBOR based on maturity groups.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The changes in fair value of the interest rate lock commitments, which are Level 3 financial instruments measured on a recurring basis, are summarized in the following table, in thousands: For the Three Months Ended For the Year Ended Balance at January 1, $ 1,827 $ 681 Total net gains included in earnings (1,485) 2,803 Issuances 5,279 17,221 Settlements (3,764) (18,878) Balance at period end $ 1,857 $ 1,827
Fair Value, by Balance Sheet Grouping	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, 2021 Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 467,862 $ 467,862 $ 467,862 $ — $ — Time deposits in other financial institutions 3,138 3,138 3,138 — — Securities: Carried at fair value 6,370,495 6,370,495 1,019 6,369,476 — Held to maturity 85,293 95,082 — 95,082 — Other investments 74,935 74,935 — 74,935 — Loans held for sale 43,037 43,037 — 43,037 — Loans, net: Commercial and industrial 2,385,165 2,368,895 — 2,358,274 10,621 PPP 1,155,328 1,155,328 — 1,155,328 — Owner occupied commercial real estate 1,818,143 1,804,021 — 1,802,788 1,233 Non-owner occupied commercial real estate 1,942,489 1,933,621 — 1,921,571 12,050 Real estate construction 776,096 782,155 — 782,155 — Agricultural and agricultural real estate 676,858 669,714 — 662,443 7,271 Residential real estate 775,982 775,020 — 775,020 — Consumer 390,223 394,731 — 394,731 — Total Loans, net 9,920,284 9,883,485 — 9,852,310 31,175 Cash surrender value on life insurance 188,521 188,521 — 188,521 — Derivative financial instruments (1) 23,991 23,991 — 23,991 — Interest rate lock commitments 1,857 1,857 — — 1,857 Forward commitments 1,213 1,213 — 1,213 — Financial liabilities: Deposits Demand deposits 6,175,946 6,175,946 — 6,175,946 — Savings deposits 8,179,251 819,251 — 819,251 — Time deposits 1,203,854 1,203,854 — 1,203,854 — Short term borrowings 140,597 140,597 — 140,597 — Other borrowings 349,514 350,964 — 350,964 — Derivative financial instruments (2) 29,791 29,791 — 29,791 — Forward commitments 4 4 — 4 — (1) Includes embedded derivatives, back-to-back loan swaps and fair value hedges. (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps and free standing derivative instruments. Fair Value Measurements at Carrying Estimated Quoted Prices in Significant Other Significant Financial assets: Cash and cash equivalents $ 337,903 $ 337,903 $ 337,903 $ — $ — Time deposits in other financial institutions 3,129 3,129 3,129 — — Securities: Carried at fair value 6,127,975 6,127,975 2,026 6,125,949 — Held to maturity 88,839 100,041 — 100,041 — Other investments 75,253 75,523 — 75,523 — Loans held for sale 57,949 57,949 — 57,949 — Loans, net: Commercial and industrial 2,495,981 2,391,041 — 2,379,785 11,256 PPP 957,785 957,785 — 957,785 — Owner occupied commercial real estate 1,756,405 1,745,397 — 1,739,523 5,874 Non-owner occupied commercial real estate 1,900,608 1,892,213 — 1,887,306 4,907 Real estate construction 843,140 849,224 — 849,224 — Agricultural and agricultural real estate 707,397 697,729 — 685,278 12,451 Residential real estate 828,507 828,366 — 828,366 — Consumer 401,622 407,914 — 407,914 — Total Loans, net 9,891,445 9,769,669 — 9,735,181 34,488 Cash surrender value on life insurance 187,664 187,664 — 187,664 — Derivative financial instruments (1) 44,102 44,102 — 44,102 — Interest rate lock commitments 1,827 1,827 — — 1,827 Financial liabilities: Deposits Demand deposits 5,688,810 5,688,810 — 5,688,810 — Savings deposits 8,019,704 8,019,704 — 8,019,704 — Time deposits 1,271,391 1,273,468 — 1,273,468 — Short term borrowings 167,872 167,872 — 167,872 — Other borrowings 457,042 458,806 — 458,806 — Derivative financial instruments (1) 51,962 51,962 — 51,962 — Forward commitments 697 697 — 697 — (1) Includes embedded derivatives, back-to-back loan swaps and fair value hedges. (2) Includes cash flow hedges, fair value hedges, back-to-back loan swaps and free standing derivative instruments.

REVENUE (Tables)

REVENUE (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Schedule of noninterest income in-scope and out-of-scope of Topic 606	The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2021, and 2020, in thousands: Three Months Ended 2021 2020 In-scope of Topic 606 Service charges and fees Service charges and fees on deposit accounts $ 3,936 $ 3,438 Overdraft fees 2,592 2,809 Customer service and other service fees 46 59 Credit card fee income 4,308 3,900 Debit card income 2,789 1,815 Total service charges and fees 13,671 12,021 Trust fees 5,777 5,022 Brokerage and insurance commissions 853 733 Total noninterest income in-scope of Topic 606 20,301 17,776 Out-of-scope of Topic 606 Loan servicing income $ 838 $ 963 Securities gains (losses), net (30) 1,658 Unrealized loss on equity securities, net (110) (231) Net gains on sale of loans held for sale 6,420 4,660 Valuation adjustment on servicing rights 917 (1,565) Income on bank owned life insurance 829 498 Other noninterest income 1,152 2,058 Total noninterest income out-of-scope of Topic 606 10,016 8,041 Total noninterest income $ 30,317 $ 25,817

STOCK COMPENSATION (Tables)

STOCK COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Summary of Status of RSUs	A summary of the RSUs outstanding as of March 31, 2021, and 2020, and changes during the three months ended March 31, 2021 and 2020, follows: 2021 2020 Shares Weighted-Average Grant Date Shares Weighted-Average Grant Date Outstanding at January 1, 348,275 $ 38.22 254,383 $ 46.76 Granted 170,317 52.08 165,731 32.57 Vested (106,255) 44.14 (86,441) 45.48 Forfeited (4,215) 50.59 (11,929) 48.38 Outstanding at March 31, 408,122 $ 42.11 321,744 $ 40.14

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, 2021	Mar. 31, 2020
Earnings Per Share
Net income	$ 52,814	$ 20,040
Preferred dividends	(2,013)	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 50,801	$ 20,040
Weighted average common shares outstanding for basic earnings per share (in shares)	42,174	36,821
Assumed incremental common shares issued upon vesting of outstanding restricted stock units (in shares)	162	75
Weighted average common shares for diluted earnings per share (in shares)	42,336	36,896
Earnings per common share — basic (in dollars per share)	$ 1.20	$ 0.54
Earnings per common share — diluted (in dollars per share)	$ 1.20	$ 0.54
Number of antidilutive common stock equivalents excluded from diluted earnings per share computation (in shares)	25	0

ACQUISITIONS (Details)

ACQUISITIONS (Details) - USD ($)	Dec. 04, 2020	Mar. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Assets acquired		$ 18,244,427,000	$ 17,908,339,000
Deposits acquired		15,559,051,000	14,979,905,000
Gross loans held to maturity		$ 10,050,456,000	$ 10,023,051,000
Share price (USD per share)	$ 41.89
Johnson Bank Branches | Arizona Bank & Trust
Business Acquisition [Line Items]
Assets acquired	$ 419,700,000
Deposits acquired	415,500,000
Gross loans held to maturity	150,700,000
AIM Bancshares, Inc.
Business Acquisition [Line Items]
Assets acquired	1,970,000,000
Deposits acquired	1,670,000,000
Gross loans held to maturity	$ 1,090,000,000
Number of shares issued In exchange per share (in shares)	$ 207
Share price (USD per share)	$ 1,887.16
Consideration paid	$ 264,500,000
Consideration received, common stock	217,200,000
AIM Bancshares, Inc. | Holders Of In-The-Money Options
Business Acquisition [Line Items]
Consideration received, common stock	$ 4,900,000

SECURITIES (Securities availabl

SECURITIES (Securities available for sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	$ 92,661	$ 127,866
Gross Unrealized Losses	(79,748)	(24,116)
Equity securities with a readily determinable fair value	20,543	19,629
Amortized, Total	6,357,582	6,024,225
Estimated Fair Value, Total	6,370,495	6,127,975
Total debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,337,039	6,004,596
Gross Unrealized Gains	92,661	127,866
Gross Unrealized Losses	(79,748)	(24,116)
Estimated Fair Value	6,349,952	6,108,346
U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	995	1,995
Gross Unrealized Gains	24	31
Gross Unrealized Losses	0	0
Estimated Fair Value	1,019	2,026
U.S. agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	212,805	167,048
Gross Unrealized Gains	1,222	657
Gross Unrealized Losses	(1,735)	(926)
Estimated Fair Value	212,292	166,779
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,737,638	1,562,631
Gross Unrealized Gains	41,460	75,555
Gross Unrealized Losses	(41,109)	(2,959)
Estimated Fair Value	1,737,989	1,635,227
Mortgage-backed securities - agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,442,422	1,351,964
Gross Unrealized Gains	19,675	16,029
Gross Unrealized Losses	(29,168)	(12,723)
Estimated Fair Value	1,432,929	1,355,270
Mortgage-backed securities - non-agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,490,868	1,428,068
Gross Unrealized Gains	14,957	22,688
Gross Unrealized Losses	(2,109)	(1,640)
Estimated Fair Value	1,503,716	1,449,116
Commercial mortgage-backed securities - agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	123,797	171,451
Gross Unrealized Gains	2,150	3,440
Gross Unrealized Losses	(3,717)	(738)
Estimated Fair Value	122,230	174,153
Commercial mortgage-backed securities - non-agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	307,744	253,421
Gross Unrealized Gains	272	37
Gross Unrealized Losses	(242)	(691)
Estimated Fair Value	307,774	252,767
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,017,016	1,064,255
Gross Unrealized Gains	12,837	9,421
Gross Unrealized Losses	(1,640)	(4,410)
Estimated Fair Value	1,028,213	1,069,266
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,754	3,763
Gross Unrealized Gains	64	8
Gross Unrealized Losses	(28)	(29)
Estimated Fair Value	$ 3,790	$ 3,742

SECURITIES (Held to maturity se

SECURITIES (Held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 85,341	$ 88,890
Gross Unrealized Gains	9,741	11,151
Gross Unrealized Losses	0	0
Estimated Fair Value	95,082	100,041
Allowance for Credit Losses	(48)	(51)
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	85,341	88,890
Gross Unrealized Gains	9,741	11,151
Gross Unrealized Losses	0	0
Estimated Fair Value	95,082	100,041
Allowance for Credit Losses	$ (48)	$ (51)	$ (197)	$ 0

SECURITIES (Securities availa_2

SECURITIES (Securities available for sale debt maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in 1 year or less	$ 2,839
Due in 1 to 5 years	30,793
Due in 5 to 10 years	250,514
Due after 10 years	1,671,046
Total debt securities	1,955,192
Mortgage and asset-backed securities	4,381,847
Equity securities with a readily determinable fair value	20,543	$ 19,629
Total investment securities	6,357,582
Estimated Fair Value
Due in 1 year or less	2,873
Due in 1 to 5 years	31,575
Due in 5 to 10 years	250,981
Due after 10 years	1,669,661
Total debt securities	1,955,090
Mortgage and asset-backed securities	4,394,862
Equity securities with a readily determinable fair value	20,543
Total investment securities	$ 6,370,495

SECURITIES (Securities held to

SECURITIES (Securities held to maturity debt maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in 1 year or less	$ 2,008
Due in 1 to 5 years	23,461
Due in 5 to 10 years	51,288
Due after 10 years	8,584
Amortized Cost	85,341	$ 88,890
Allowance for credit losses	(48)
Total investment securities	85,293	88,839
Estimated Fair Value
Due in 1 year or less	2,028
Due in 1 to 5 years	25,067
Due in 5 to 10 years	56,258
Due after 10 years	11,729
Estimated Fair Value	95,082	$ 100,041
Allowance for credit losses	0
Total investment securities	$ 95,082

SECURITIES (Narrative) (Details

SECURITIES (Narrative) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivable	$ 21,400,000
Fair value of securities pledged	1,780,000,000	$ 2,120,000,000
Securities held to maturity with unrealized losses	0	0
Amortized cost of FHLBs	$ 19,200,000	$ 19,500,000

SECURITIES (Gross realized gain

SECURITIES (Gross realized gain (loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 207,067	$ 328,890
Gross security gains	445	2,904
Gross security losses	$ 475	$ 1,246

SECURITIES (Debt securities ava

SECURITIES (Debt securities available for sale) (Details) $ in Thousands	Mar. 31, 2021USD ($)bankLocation	Dec. 31, 2020USD ($)bankLocation
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 2,626,514	$ 1,672,530
Unrealized Losses, Less than 12 months	$ (76,841)	$ (18,373)
Count, Less than 12 months | bankLocation	262	127
Fair Value, 12 months or longer	$ 289,669	$ 508,436
Unrealized Losses, 12 months or longer	$ (2,907)	$ (5,743)
Count, 12 months or longer | bankLocation	98	103
Fair Value, Total	$ 2,916,183	$ 2,180,966
Unrealized Losses, Total	$ (79,748)	$ (24,116)
Count, Total | bankLocation	360	230
U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 0	$ 0
Unrealized Losses, Less than 12 months	$ 0	$ 0
Count, Less than 12 months | bankLocation	0	0
Fair Value, 12 months or longer	$ 0	$ 0
Unrealized Losses, 12 months or longer	$ 0	$ 0
Count, 12 months or longer | bankLocation	0	0
Fair Value, Total	$ 0	$ 0
Unrealized Losses, Total	$ 0	$ 0
Count, Total | bankLocation	0	0
U.S. agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 23,581	$ 2,981
Unrealized Losses, Less than 12 months	$ (997)	$ (8)
Count, Less than 12 months | bankLocation	2	5
Fair Value, 12 months or longer	$ 95,757	$ 99,922
Unrealized Losses, 12 months or longer	$ (738)	$ (918)
Count, 12 months or longer | bankLocation	73	72
Fair Value, Total	$ 119,338	$ 102,903
Unrealized Losses, Total	$ (1,735)	$ (926)
Count, Total | bankLocation	75	77
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 1,000,647	$ 346,598
Unrealized Losses, Less than 12 months	$ (40,997)	$ (2,959)
Count, Less than 12 months | bankLocation	169	49
Fair Value, 12 months or longer	$ 13,126	$ 0
Unrealized Losses, 12 months or longer	$ (112)	$ 0
Count, 12 months or longer | bankLocation	2	0
Fair Value, Total	$ 1,013,773	$ 346,598
Unrealized Losses, Total	$ (41,109)	$ (2,959)
Count, Total | bankLocation	171	49
Mortgage-backed securities - agency
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 774,060	$ 653,793
Unrealized Losses, Less than 12 months	$ (28,762)	$ (12,342)
Count, Less than 12 months | bankLocation	51	35
Fair Value, 12 months or longer	$ 27,063	$ 31,012
Unrealized Losses, 12 months or longer	$ (406)	$ (381)
Count, 12 months or longer | bankLocation	2	3
Fair Value, Total	$ 801,123	$ 684,805
Unrealized Losses, Total	$ (29,168)	$ (12,723)
Count, Total | bankLocation	53	38
Mortgage-backed securities - non-agency
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 568,107	$ 378,843
Unrealized Losses, Less than 12 months	$ (1,801)	$ (1,639)
Count, Less than 12 months | bankLocation	18	17
Fair Value, 12 months or longer	$ 30,172	$ 1,622
Unrealized Losses, 12 months or longer	$ (308)	$ (1)
Count, 12 months or longer | bankLocation	5	1
Fair Value, Total	$ 598,279	$ 380,465
Unrealized Losses, Total	$ (2,109)	$ (1,640)
Count, Total | bankLocation	23	18
Commercial mortgage-backed securities - agency
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 72,262	$ 46,541
Unrealized Losses, Less than 12 months	$ (3,717)	$ (738)
Count, Less than 12 months | bankLocation	11	6
Fair Value, 12 months or longer	$ 0	$ 0
Unrealized Losses, 12 months or longer	$ 0	$ 0
Count, 12 months or longer | bankLocation	0	0
Fair Value, Total	$ 72,262	$ 46,541
Unrealized Losses, Total	$ (3,717)	$ (738)
Count, Total | bankLocation	11	6
Commercial mortgage-backed securities - non-agency
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 57,789	$ 100,042
Unrealized Losses, Less than 12 months	$ (6)	$ (15)
Count, Less than 12 months | bankLocation	1	2
Fair Value, 12 months or longer	$ 34,659	$ 35,428
Unrealized Losses, 12 months or longer	$ (236)	$ (676)
Count, 12 months or longer | bankLocation	4	3
Fair Value, Total	$ 92,448	$ 135,470
Unrealized Losses, Total	$ (242)	$ (691)
Count, Total | bankLocation	5	5
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 128,354	$ 141,824
Unrealized Losses, Less than 12 months	$ (533)	$ (643)
Count, Less than 12 months | bankLocation	6	9
Fair Value, 12 months or longer	$ 88,892	$ 340,452
Unrealized Losses, 12 months or longer	$ (1,107)	$ (3,767)
Count, 12 months or longer | bankLocation	12	24
Fair Value, Total	$ 217,246	$ 482,276
Unrealized Losses, Total	$ (1,640)	$ (4,410)
Count, Total | bankLocation	18	33
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 1,714	$ 1,908
Unrealized Losses, Less than 12 months	$ (28)	$ (29)
Count, Less than 12 months | bankLocation	4	4
Fair Value, 12 months or longer	$ 0	$ 0
Unrealized Losses, 12 months or longer	$ 0	$ 0
Count, 12 months or longer | bankLocation	0	0
Fair Value, Total	$ 1,714	$ 1,908
Unrealized Losses, Total	$ (28)	$ (29)
Count, Total | bankLocation	4	4

SECURITIES (Schedule of allowan

SECURITIES (Schedule of allowance for credit loss for securities held to maturity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 51
Impact of ASU 2016-13 adoption	51
Ending balance	48
Obligations of states and political subdivisions
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	51	$ 0
Impact of ASU 2016-13 adoption	51	197
Provision (benefit) for credit losses	(3)	39
Ending balance	48	197
Obligations of states and political subdivisions | Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	158
Impact of ASU 2016-13 adoption	0	158
Obligations of states and political subdivisions | Cumulative Effect, Period of Adoption, Adjusted Balance
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	51	158
Impact of ASU 2016-13 adoption	$ 51	$ 158

SECURITIES (Schedule of financi

SECURITIES (Schedule of financing receivable credit quality indicators) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 85,341	$ 88,890
Obligations of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Total	85,341	88,890
Standard & Poor's, AAA Rating | Obligations of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,178	0
Standard & Poor's, AA, AA+, AA- | Obligations of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Total	61,816	64,385
Standard & Poor's, A+, A, A- Rating | Obligations of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Total	15,150	18,353
Standard & Poor's, BBB Rating | Obligations of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,729	4,208
Standard & Poor's, Not Rated | Obligations of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 468	$ 1,944

LOANS (Loans receivable) (Detai

LOANS (Loans receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Loans and Leases [Line Items]
Held to maturity	$ 10,050,456	$ 10,023,051
Allowance for credit losses	(130,172)	(131,606)	$ (97,350)	$ (70,395)
Loans receivable, net	9,920,284	9,891,445
Accrued interest receivable	41,600
Commercial and industrial | Commercial and industrial
Loans and Leases [Line Items]
Held to maturity	2,421,260	2,534,799
Allowance for credit losses	(36,095)	(38,818)	(32,455)	(34,207)
Commercial and industrial | Paycheck Protection Program ("PPP")
Loans and Leases [Line Items]
Held to maturity	1,155,328	957,785
Allowance for credit losses	0	0	0	0
Commercial and industrial | Owner occupied commercial real estate
Loans and Leases [Line Items]
Held to maturity	1,837,559	1,776,406
Allowance for credit losses	(19,416)	(20,001)	(10,337)	(7,921)
Commercial and industrial | Non-owner occupied commercial real estate
Loans and Leases [Line Items]
Held to maturity	1,967,183	1,921,481
Allowance for credit losses	(24,694)	(20,873)	(8,320)	(7,584)
Commercial and industrial | Real estate construction
Loans and Leases [Line Items]
Held to maturity	796,027	863,220
Allowance for credit losses	(19,931)	(20,080)	(22,951)	(8,677)
Agricultural and agricultural real estate
Loans and Leases [Line Items]
Held to maturity	683,969	714,526
Allowance for credit losses	(7,111)	(7,129)	(4,797)	(5,680)
Residential real estate
Loans and Leases [Line Items]
Held to maturity	786,994	840,442
Allowance for credit losses	(11,012)	(11,935)	(8,725)	(1,504)
Consumer
Loans and Leases [Line Items]
Held to maturity	402,136	414,392
Allowance for credit losses	$ (11,913)	$ (12,770)	$ (9,765)	$ (4,822)

LOANS (Allowance for credit los

LOANS (Allowance for credit losses on financing receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	$ 11,897	$ 9,426
Collectively Evaluated for Credit Losses	118,275	122,180
Total	130,172	131,606	$ 97,350	$ 70,395
Loans Individually Evaluated for Credit Losses	62,990	57,230
Loans Collectively Evaluated for Credit Losses	9,987,466	9,965,821
Total	10,050,456	10,023,051
Commercial and industrial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	3,433	4,077
Collectively Evaluated for Credit Losses	32,662	34,741
Total	36,095	38,818	32,455	34,207
Loans Individually Evaluated for Credit Losses	14,560	16,578
Loans Collectively Evaluated for Credit Losses	2,406,700	2,518,221
Total	2,421,260	2,534,799
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	0	0
Total	0	0	0	0
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	1,155,328	957,785
Total	1,155,328	957,785
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	110	111
Collectively Evaluated for Credit Losses	19,306	19,890
Total	19,416	20,001	10,337	7,921
Loans Individually Evaluated for Credit Losses	10,720	11,174
Loans Collectively Evaluated for Credit Losses	1,826,839	1,765,232
Total	1,837,559	1,776,406
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	5,873	3,250
Collectively Evaluated for Credit Losses	18,821	17,623
Total	24,694	20,873	8,320	7,584
Loans Individually Evaluated for Credit Losses	22,655	13,490
Loans Collectively Evaluated for Credit Losses	1,944,528	1,907,991
Total	1,967,183	1,921,481
Commercial and industrial | Real estate construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	19,931	20,080
Total	19,931	20,080	22,951	8,677
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	796,027	863,220
Total	796,027	863,220
Agricultural and agricultural real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	2,481	1,988
Collectively Evaluated for Credit Losses	4,630	5,141
Total	7,111	7,129	4,797	5,680
Loans Individually Evaluated for Credit Losses	14,926	15,453
Loans Collectively Evaluated for Credit Losses	669,043	699,073
Total	683,969	714,526
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	11,012	11,935
Total	11,012	11,935	8,725	1,504
Loans Individually Evaluated for Credit Losses	129	535
Loans Collectively Evaluated for Credit Losses	786,865	839,907
Total	786,994	840,442
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually Evaluated for Credit Losses	0	0
Collectively Evaluated for Credit Losses	11,913	12,770
Total	11,913	12,770	$ 9,765	$ 4,822
Loans Individually Evaluated for Credit Losses	0	0
Loans Collectively Evaluated for Credit Losses	402,136	414,392
Total	$ 402,136	$ 414,392

LOANS (Financing receivables, n

LOANS (Financing receivables, non accrual status narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Troubled debt restructured loans	$ 6.1	$ 6.2
Nonperforming
Financing Receivable, Nonaccrual [Line Items]
Troubled debt restructured loans	3.7	3.8
Performing
Financing Receivable, Nonaccrual [Line Items]
Troubled debt restructured loans	$ 2.4	$ 2.4

LOANS (Troubled debt restructur

LOANS (Troubled debt restructuring) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Pre- Modification Recorded Investment	$ 0	$ 32
Post- Modification Recorded Investment	$ 0	$ 32
With Payment Defaults
Number of Loans | loan	0	1
Recorded Investment	$ 0	$ 241
Commercial and industrial | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre- Modification Recorded Investment	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0
With Payment Defaults
Number of Loans | loan	0	0
Recorded Investment	$ 0	$ 0
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre- Modification Recorded Investment	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0
With Payment Defaults
Number of Loans | loan	0	0
Recorded Investment	$ 0	$ 0
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre- Modification Recorded Investment	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0
With Payment Defaults
Number of Loans | loan	0	0
Recorded Investment	$ 0	$ 0
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre- Modification Recorded Investment	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0
With Payment Defaults
Number of Loans | loan	0	0
Recorded Investment	$ 0	$ 0
Commercial and industrial | Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre- Modification Recorded Investment	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0
With Payment Defaults
Number of Loans | loan	0	0
Recorded Investment	$ 0	$ 0
Agricultural and agricultural real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre- Modification Recorded Investment	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0
With Payment Defaults
Number of Loans | loan	0	0
Recorded Investment	$ 0	$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Pre- Modification Recorded Investment	$ 0	$ 32
Post- Modification Recorded Investment	$ 0	$ 32
With Payment Defaults
Number of Loans | loan	0	1
Recorded Investment	$ 0	$ 241
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	0
Pre- Modification Recorded Investment	$ 0	$ 0
Post- Modification Recorded Investment	$ 0	$ 0
With Payment Defaults
Number of Loans | loan	0	0
Recorded Investment	$ 0	$ 0

LOANS (Troubled debt narrative)

LOANS (Troubled debt narrative) (Details) - loan	Mar. 31, 2021	Dec. 31, 2020
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loan relationships	0	0

LOANS (Loans by credit quality

LOANS (Loans by credit quality indicator) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	$ 901,120	$ 3,119,680
Year Two	2,838,862	1,842,640
Year Three	1,689,532	1,287,023
Year Four	1,126,940	842,221
Year Five	769,848	485,454
Year Six and Prior	1,610,726	1,254,784
Revolving	1,113,428	1,191,249
Total	10,050,456	10,023,051
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	865,239	2,847,203
Year Two	2,595,223	1,649,219
Year Three	1,487,367	1,131,756
Year Four	927,474	727,712
Year Five	662,498	408,380
Year Six and Prior	1,377,044	1,091,908
Revolving	983,115	1,084,202
Total	8,897,960	8,940,380
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	14,091	129,037
Year Two	111,595	141,385
Year Three	162,256	80,970
Year Four	129,962	58,813
Year Five	60,126	44,512
Year Six and Prior	124,465	76,144
Revolving	102,806	74,056
Total	705,301	604,917
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	21,790	143,440
Year Two	132,044	52,036
Year Three	39,909	74,297
Year Four	69,504	55,696
Year Five	47,224	32,562
Year Six and Prior	109,217	86,732
Revolving	27,507	32,991
Total	447,195	477,754
Commercial and industrial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	87,097	622,451
Year Two	579,229	381,759
Year Three	339,138	197,442
Year Four	170,699	245,675
Year Five	233,491	118,180
Year Six and Prior	434,409	359,845
Revolving	577,197	609,447
Total	2,421,260	2,534,799
Commercial and industrial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	85,059	557,853
Year Two	523,968	340,809
Year Three	305,803	168,873
Year Four	142,927	215,696
Year Five	206,293	101,010
Year Six and Prior	386,530	337,834
Revolving	481,837	541,627
Total	2,132,417	2,263,702
Commercial and industrial | Commercial and industrial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,213	41,574
Year Two	31,058	24,676
Year Three	23,144	19,672
Year Four	19,494	14,262
Year Five	15,308	8,072
Year Six and Prior	21,877	2,474
Revolving	78,657	49,432
Total	190,751	160,162
Commercial and industrial | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	825	23,024
Year Two	24,203	16,274
Year Three	10,191	8,897
Year Four	8,278	15,717
Year Five	11,890	9,098
Year Six and Prior	26,002	19,537
Revolving	16,703	18,388
Total	98,092	110,935
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	415,501	957,785
Year Two	739,827	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	1,155,328	957,785
Commercial and industrial | Paycheck Protection Program ("PPP") | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	400,126	880,709
Year Two	671,099	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	1,071,225	880,709
Commercial and industrial | Paycheck Protection Program ("PPP") | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	9,625	22,533
Year Two	20,344	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	29,969	22,533
Commercial and industrial | Paycheck Protection Program ("PPP") | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	5,750	54,543
Year Two	48,384	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Year Six and Prior	0	0
Revolving	0	0
Total	54,134	54,543
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	100,573	431,921
Year Two	446,836	392,687
Year Three	417,813	334,894
Year Four	304,119	202,428
Year Five	185,570	124,531
Year Six and Prior	337,893	250,770
Revolving	44,755	39,175
Total	1,837,559	1,776,406
Commercial and industrial | Owner occupied commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	97,898	400,662
Year Two	415,729	369,401
Year Three	387,953	300,242
Year Four	271,720	167,470
Year Five	152,313	107,234
Year Six and Prior	289,744	213,780
Revolving	36,676	33,759
Total	1,652,033	1,592,548
Commercial and industrial | Owner occupied commercial real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	768	15,345
Year Two	16,775	13,764
Year Three	22,063	22,488
Year Four	22,059	20,811
Year Five	20,427	8,717
Year Six and Prior	19,212	15,282
Revolving	7,131	4,311
Total	108,435	100,718
Commercial and industrial | Owner occupied commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,907	15,914
Year Two	14,332	9,522
Year Three	7,797	12,164
Year Four	10,340	14,147
Year Five	12,830	8,580
Year Six and Prior	28,937	21,708
Revolving	948	1,105
Total	77,091	83,140
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	96,996	388,447
Year Two	385,704	481,561
Year Three	484,335	353,464
Year Four	351,685	229,871
Year Five	217,284	138,171
Year Six and Prior	406,012	299,885
Revolving	25,167	30,082
Total	1,967,183	1,921,481
Commercial and industrial | Non-owner occupied commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	94,856	334,722
Year Two	334,303	411,301
Year Three	379,230	305,456
Year Four	297,195	194,101
Year Five	181,937	108,070
Year Six and Prior	307,473	233,153
Revolving	20,154	24,466
Total	1,615,148	1,611,269
Commercial and industrial | Non-owner occupied commercial real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	22,826
Year Two	20,932	55,225
Year Three	91,095	24,718
Year Four	31,107	18,724
Year Five	20,494	20,954
Year Six and Prior	67,914	45,672
Revolving	5,013	5,114
Total	236,555	193,233
Commercial and industrial | Non-owner occupied commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	2,140	30,899
Year Two	30,469	15,035
Year Three	14,010	23,290
Year Four	23,383	17,046
Year Five	14,853	9,147
Year Six and Prior	30,625	21,060
Revolving	0	502
Total	115,480	116,979
Commercial and industrial | Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	66,801	313,926
Year Two	345,206	339,097
Year Three	240,537	161,610
Year Four	103,533	12,957
Year Five	11,047	7,048
Year Six and Prior	9,901	5,856
Revolving	19,002	22,726
Total	796,027	863,220
Commercial and industrial | Real estate construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	66,643	311,625
Year Two	342,374	309,678
Year Three	229,345	157,171
Year Four	54,006	12,625
Year Five	10,730	6,954
Year Six and Prior	9,485	5,110
Revolving	18,588	21,431
Total	731,171	824,594
Commercial and industrial | Real estate construction | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	2,105
Year Two	2,832	26,659
Year Three	11,164	2,403
Year Four	47,532	332
Year Five	317	55
Year Six and Prior	25	388
Revolving	414	1,295
Total	62,284	33,237
Commercial and industrial | Real estate construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	158	196
Year Two	0	2,760
Year Three	28	2,036
Year Four	1,995	0
Year Five	0	39
Year Six and Prior	391	358
Revolving	0	0
Total	2,572	5,389
Agricultural and agricultural real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	64,428	209,481
Year Two	180,587	114,190
Year Three	100,997	94,722
Year Four	78,358	48,458
Year Five	40,419	25,058
Year Six and Prior	68,202	50,805
Revolving	150,978	171,812
Total	683,969	714,526
Agricultural and agricultural real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	56,474	171,578
Year Two	149,863	90,944
Year Three	81,301	62,349
Year Four	49,483	39,252
Year Five	32,928	17,626
Year Six and Prior	49,165	37,696
Revolving	132,606	148,456
Total	551,820	567,901
Agricultural and agricultural real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,268	20,500
Year Two	17,561	16,202
Year Three	12,753	8,854
Year Four	6,863	2,448
Year Five	1,636	3,515
Year Six and Prior	6,667	3,157
Revolving	10,136	12,282
Total	56,884	66,958
Agricultural and agricultural real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	6,686	17,403
Year Two	13,163	7,044
Year Three	6,943	23,519
Year Four	22,012	6,758
Year Five	5,855	3,917
Year Six and Prior	12,370	9,952
Revolving	8,236	11,074
Total	75,265	79,667
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	52,212	157,983
Year Two	128,210	104,389
Year Three	82,501	123,549
Year Four	100,024	86,958
Year Five	67,991	67,478
Year Six and Prior	328,622	265,518
Revolving	27,434	34,567
Total	786,994	840,442
Residential real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	46,700	153,017
Year Two	125,274	99,440
Year Three	80,624	118,854
Year Four	95,884	83,534
Year Five	64,961	63,477
Year Six and Prior	312,167	244,852
Revolving	26,634	33,467
Total	752,244	796,641
Residential real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	1,188	3,986
Year Two	1,989	4,507
Year Three	1,676	2,188
Year Four	2,067	1,896
Year Five	1,620	3,117
Year Six and Prior	8,062	8,525
Revolving	0	0
Total	16,602	24,219
Residential real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	4,324	980
Year Two	947	442
Year Three	201	2,507
Year Four	2,073	1,528
Year Five	1,410	884
Year Six and Prior	8,393	12,141
Revolving	800	1,100
Total	18,148	19,582
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	17,512	37,686
Year Two	33,263	28,957
Year Three	24,211	21,342
Year Four	18,522	15,874
Year Five	14,046	4,988
Year Six and Prior	25,687	22,105
Revolving	268,895	283,440
Total	402,136	414,392
Consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	17,483	37,037
Year Two	32,613	27,646
Year Three	23,111	18,811
Year Four	16,259	15,034
Year Five	13,336	4,009
Year Six and Prior	22,480	19,483
Revolving	266,620	280,996
Total	391,902	403,016
Consumer | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	29	168
Year Two	104	352
Year Three	361	647
Year Four	840	340
Year Five	324	82
Year Six and Prior	708	646
Revolving	1,455	1,622
Total	3,821	3,857
Consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Year One	0	481
Year Two	546	959
Year Three	739	1,884
Year Four	1,423	500
Year Five	386	897
Year Six and Prior	2,499	1,976
Revolving	820	822
Total	$ 6,413	$ 7,519

LOANS (Loans by credit qualit_2

LOANS (Loans by credit quality indicator narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity	$ 10,050,456,000		$ 10,023,051,000
Allowance for credit loss	130,172,000	$ 97,350,000	$ 131,606,000	$ 70,395,000
Loans secured by residential real estate property in process of foreclosure	$ 1,600,000
Loans delinquent 30 to 89 days, percentage	0.16%		0.23%
Interest income on nonaccrual loans	$ 0	$ 0
Nonaccrual loans with no related allowance	30,500,000		$ 32,500,000
Nonpass | Paycheck Protection Program ("PPP")
Financing Receivable, Credit Quality Indicator [Line Items]
Held to maturity	84,100,000		$ 77,100,000
Allowance for credit loss	$ 0

LOANS (Past due financing recei

LOANS (Past due financing receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 16,327	$ 23,601
Current	9,942,411	9,912,064
Nonaccrual	91,718	87,386
Total	10,050,456	10,023,051
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	14,161	17,400
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,995	5,481
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	171	720
Commercial and industrial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	3,900	8,867
Current	2,397,518	2,504,170
Nonaccrual	19,842	21,762
Total	2,421,260	2,534,799
Commercial and industrial | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,632	5,825
Commercial and industrial | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	219	2,322
Commercial and industrial | Commercial and industrial | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	49	720
Commercial and industrial | Paycheck Protection Program ("PPP")
Financing Receivable, Past Due [Line Items]
Total Past Due	0	1
Current	1,155,328	957,784
Nonaccrual	0	0
Total	1,155,328	957,785
Commercial and industrial | Paycheck Protection Program ("PPP") | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	1
Commercial and industrial | Paycheck Protection Program ("PPP") | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial and industrial | Paycheck Protection Program ("PPP") | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial and industrial | Owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	519	2,982
Current	1,824,298	1,759,649
Nonaccrual	12,742	13,775
Total	1,837,559	1,776,406
Commercial and industrial | Owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	519	2,815
Commercial and industrial | Owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	167
Commercial and industrial | Owner occupied commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial and industrial | Non-owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	4,758	4,817
Current	1,938,728	1,902,003
Nonaccrual	23,697	14,661
Total	1,967,183	1,921,481
Commercial and industrial | Non-owner occupied commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,174	2,143
Commercial and industrial | Non-owner occupied commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	584	2,674
Commercial and industrial | Non-owner occupied commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial and industrial | Real estate construction
Financing Receivable, Past Due [Line Items]
Total Past Due	393	2,542
Current	795,057	859,784
Nonaccrual	577	894
Total	796,027	863,220
Commercial and industrial | Real estate construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	393	2,446
Commercial and industrial | Real estate construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	96
Commercial and industrial | Real estate construction | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Agricultural and agricultural real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	835	1,688
Current	665,069	694,150
Nonaccrual	18,065	18,688
Total	683,969	714,526
Agricultural and agricultural real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	830	1,688
Agricultural and agricultural real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5	0
Agricultural and agricultural real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	5,311	1,758
Current	768,401	825,047
Nonaccrual	13,282	13,637
Total	786,994	840,442
Residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,088	1,675
Residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,101	83
Residential real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	122	0
Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	611	946
Current	398,012	409,477
Nonaccrual	3,513	3,969
Total	402,136	414,392
Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	525	807
Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	86	139
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

LOANS (Carrying amount of loans

LOANS (Carrying amount of loans acquired narrative) (Details) $ in Millions	Dec. 04, 2020USD ($)
Johnson Bank Branches
Business Acquisition [Line Items]
Estimated fair value of loans acquired	$ 150.7
AIM Bancshares, Inc.
Business Acquisition [Line Items]
Estimated fair value of loans acquired	$ 1,090

ALLOWANCE FOR CREDIT LOSSES (De

ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 131,606	$ 70,395
Charge-offs	(2,126)	(6,300)
Recoveries	676	1,319
Provision	16	19,865
Ending Balance	130,172	97,350
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	15,280	248
Impact of ASU 2016-13 adoption on January 1, 2020	14,619	15,468
Provision	(661)	1,616
Ending balance	14,619	15,468
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		12,071
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance		13,604
Impact of ASU 2016-13 adoption on January 1, 2020		13,604
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		82,466
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance		13,852
Impact of ASU 2016-13 adoption on January 1, 2020		13,852
Agricultural and Agricultural Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	7,129	5,680
Charge-offs	(318)	(253)
Recoveries	21	826
Provision	279	(1,069)
Ending Balance	7,111	4,797
Agricultural and Agricultural Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		(387)
Agricultural and Agricultural Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		5,293
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11,935	1,504
Charge-offs	(21)	(79)
Recoveries	5	3
Provision	(907)	2,480
Ending Balance	11,012	8,725
Residential Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		4,817
Residential Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		6,321
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	12,770	4,822
Charge-offs	(798)	(717)
Recoveries	302	220
Provision	(361)	1,131
Ending Balance	11,913	9,765
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		4,309
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		9,131
Commercial and Industrial | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	38,818	34,207
Charge-offs	(948)	(5,230)
Recoveries	293	264
Provision	(2,068)	3,486
Ending Balance	36,095	32,455
Commercial and Industrial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		(272)
Commercial and Industrial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		33,935
Paycheck Protection Program ("PPP") | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	0	0
Charge-offs	0	0
Recoveries	0	0
Provision	0	0
Ending Balance	0	0
Paycheck Protection Program ("PPP") | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		0
Paycheck Protection Program ("PPP") | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		0
Owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	20,001	7,921
Charge-offs	(41)
Recoveries	53	1
Provision	(597)	2,529
Ending Balance	19,416	10,337
Owner occupied commercial real estate | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		(114)
Owner occupied commercial real estate | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		7,807
Non-owner occupied commercial real estate | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	20,873	7,584
Charge-offs	0	0
Recoveries	0	0
Provision	3,821	3,353
Ending Balance	24,694	8,320
Non-owner occupied commercial real estate | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		(2,617)
Non-owner occupied commercial real estate | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		4,967
Real Estate Construction | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	20,080	8,677
Charge-offs	0	(21)
Recoveries	2	5
Provision	(151)	7,955
Ending Balance	$ 19,931	22,951
Real Estate Construction | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		6,335
Real Estate Construction | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		$ 15,012

GOODWILL, CORE DEPOSIT PREMIU_3

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Goodwill narrative) (Details) - USD ($)	Dec. 04, 2020	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill			$ 576,005,000	$ 576,005,000
Goodwill impairment		$ 0
AIM Bancshares, Inc.
Goodwill [Line Items]
Goodwill	$ 91,400,000
AIM Bancshares, Inc. | Core Deposits
Goodwill [Line Items]
Intangibles recognized	$ 3,100,000
Intangibles, amortization period	10 years
Johnson Bank Branches
Goodwill [Line Items]
Goodwill	$ 38,400,000
Johnson Bank Branches | Core Deposits
Goodwill [Line Items]
Intangibles recognized	$ 1,300,000
Intangibles, amortization period	10 years

GOODWILL, CORE DEPOSIT PREMIU_4

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Carrying amount of intangible assets (incl accumulated amortization) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 121,197	$ 120,684
Accumulated Amortization	74,377	72,249
Net Carrying Amount	46,820	48,435
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,185	101,185
Accumulated Amortization	61,477	58,970
Net Carrying Amount	39,708	42,215
Customer relationship intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,177	1,177
Accumulated Amortization	1,018	1,009
Net Carrying Amount	159	168
Mortgage servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,781	11,268
Accumulated Amortization	5,563	6,079
Net Carrying Amount	6,218	5,189
Commercial servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,054	7,054
Accumulated Amortization	6,319	6,191
Net Carrying Amount	$ 735	$ 863

GOODWILL, CORE DEPOSIT PREMIU_5

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Mortgage and commercial loans servicing narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Valuation servicing rights in tranches [Line Items]
Loans guaranteed and sold with servicing retained	$ 6,953,000		$ 6,052,000
Valuation allowance	1,400,000
First Bank & Trust
Valuation servicing rights in tranches [Line Items]
Mortgage loans serviced for others	745,100,000		743,300,000
Custodial escrow balances maintained	$ 9,400,000		$ 5,700,000
Mortgage servicing rights
Valuation servicing rights in tranches [Line Items]
Average constant prepayment rate	14.20%		16.20%
Servicing assets, discount rate	9.02%		9.02%
Fees collected for servicing of mortgage loans	$ 464,000	$ 409,000
Mortgage servicing rights | Measurement Input, Cap Rate | Minimum
Valuation servicing rights in tranches [Line Items]
Average capitalization rate (percent)	0.0076	0.0095
Mortgage servicing rights | Measurement Input, Cap Rate | Maximum
Valuation servicing rights in tranches [Line Items]
Average capitalization rate (percent)	0.0112	0.0116
Mortgage servicing rights | First Bank & Trust
Valuation servicing rights in tranches [Line Items]
Fair value of mortgage servicing rights	$ 6,200,000		$ 5,200,000
Commercial servicing rights
Valuation servicing rights in tranches [Line Items]
Fair value of mortgage servicing rights	1,239,000	$ 1,407,000	1,300,000
Loans guaranteed and sold with servicing retained	$ 62,400,000		$ 66,200,000
Commercial servicing rights | Minimum
Valuation servicing rights in tranches [Line Items]
Average constant prepayment rate	13.83%		14.95%
Servicing assets, discount rate	6.89%		7.70%
Commercial servicing rights | Maximum
Valuation servicing rights in tranches [Line Items]
Average constant prepayment rate	17.76%		19.25%
Servicing assets, discount rate	8.53%		12.88%
Commercial servicing rights | Measurement Input, Cap Rate | Minimum
Valuation servicing rights in tranches [Line Items]
Average capitalization rate (percent)			0.0310
Commercial servicing rights | Measurement Input, Cap Rate | Maximum
Valuation servicing rights in tranches [Line Items]
Average capitalization rate (percent)			0.0445
Mortgage Servicing Rights 15-year Tranche
Valuation servicing rights in tranches [Line Items]
Valuation allowance	$ 401,000		$ 422,000
Amortization period	15 years
Mortgage Servicing Rights 30-year Tranche
Valuation servicing rights in tranches [Line Items]
Valuation allowance			1,400,000
Amortization period	30 years
Less Than 20 Years
Valuation servicing rights in tranches [Line Items]
Fair value of mortgage servicing rights	$ 230,000		203,000
Fees collected for servicing of mortgage loans	$ 129,000	$ 118,000
Period of tranche	20 years
Valuation allowance	$ 0		$ 0
Amortization period	20 years		20 years
More Than 20 Years
Valuation servicing rights in tranches [Line Items]
Fair value of mortgage servicing rights	$ 1,009,000		$ 1,085,000
Period of tranche	20 years
Valuation allowance	$ 0		$ 0
Amortization period	20 years		20 years

GOODWILL, CORE DEPOSIT PREMIU_6

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Estimated future amortization expense for amortizable intangible assets) (Details) $ in Thousands	Mar. 31, 2021USD ($)
Future amortization expense for amortizable intangible assets [Line Items]
Nine months ending December 31, 2021	$ 8,257
Year ending December 31,
2022	9,197
2023	7,996
2024	6,618
2025	5,553
2026	4,071
Thereafter	5,128
Total	46,820
Core Deposit Intangibles
Future amortization expense for amortizable intangible assets [Line Items]
Nine months ending December 31, 2021	6,852
Year ending December 31,
2022	7,702
2023	6,739
2024	5,591
2025	4,700
2026	3,533
Thereafter	4,591
Total	39,708
Customer Relationship Intangibles
Future amortization expense for amortizable intangible assets [Line Items]
Nine months ending December 31, 2021	27
Year ending December 31,
2022	34
2023	33
2024	33
2025	32
2026	0
Thereafter	0
Total	159
Mortgage Servicing Rights
Future amortization expense for amortizable intangible assets [Line Items]
Nine months ending December 31, 2021	1,201
Year ending December 31,
2022	1,254
2023	1,075
2024	896
2025	717
2026	538
Thereafter	537
Total	6,218
Commercial Servicing Rights
Future amortization expense for amortizable intangible assets [Line Items]
Nine months ending December 31, 2021	177
Year ending December 31,
2022	207
2023	149
2024	98
2025	104
2026	0
Thereafter	0
Total	$ 735

GOODWILL, CORE DEPOSIT PREMIU_7

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Changes in capitalized mortgage and commercial servicing rights) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Mortgage servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 5,189	$ 5,621
Originations	512	376
Amortization	(400)	(307)
Sale of mortgage servicing rights	0	0
Valuation adjustment	917	(1,565)
Balance at end of period	$ 6,218	$ 4,125
Servicing rights, net to servicing portfolio	0.83%	0.67%
Commercial servicing rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 863	$ 1,115
Originations	0	38
Amortization	(128)	(58)
Balance at end of period	735	1,095
Fair value of mortgage servicing rights	$ 1,239	$ 1,407	$ 1,300
Servicing rights, net to servicing portfolio	1.18%	1.41%

GOODWILL, CORE DEPOSIT PREMIU_8

GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Book value, fair value of commercial serving rights and impairment) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Valuation Allowance	$ 1,400,000
Less Than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	80,000	$ 87,000
Fair Value	230,000	203,000
Valuation Allowance	0	0
More Than 20 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	655,000	776,000
Fair Value	1,009,000	1,085,000
Valuation Allowance	0	0
First Bank & Trust | 15 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	1,667,000	1,522,000
Fair Value	1,266,000	1,100,000
Valuation Allowance	401,000	422,000
First Bank & Trust | 30 Years
Finite-Lived Intangible Assets [Line Items]
Book Value	6,380,000	5,445,000
Fair Value	4,952,000	4,089,000
Valuation Allowance	$ 1,428,000	$ 1,356,000

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Cash collateral on derivative financial instruments narrative) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Cash pledged as collateral	$ 2,900,000	$ 3,800,000
Counterparties
Derivative [Line Items]
Cash pledged as collateral	$ 0	$ 0

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS (Cash flow hedges narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	May 18, 2018
Derivative [Line Items]
Change in net unrealized losses and reclassification from AOCI to interest expense on cash flow hedges	$ 591
Estimated amount to be reclassified from accumulated other comprehensive income to interest expense	2,400
Interest Rate Swaps | Cash Flow Hedges
Derivative [Line Items]
Derivative, notional amount	65,000	$ 9,000
Interest Rate Swaps | Cash Flow Hedges | Heartland Financial Statutory Trust IV, V, VI, And VII
Derivative [Line Items]
Derivative, notional amount	65,000
Interest Rate Swaps | Cash Flow Hedges | Heartland Financial Statutory Trust VI
Derivative [Line Items]
Derivative, notional amount	$ 25,000
Interest Rate Swaps | Cash Flow Hedges | OCGI Statutory Trust III
Derivative [Line Items]
Derivative, notional amount		3,000
Interest Rate Swaps | Cash Flow Hedges | OCGI Capital Trust IV
Derivative [Line Items]
Derivative, notional amount		$ 6,000

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS (Cash flow hedges balance sheet category and fair values) (Details) - Other liabilities - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Interest Rate Swap due March 17, 2021
Derivatives, Fair Value [Line Items]
Notional Amount	$ 25,000	$ 25,000
Fair Value	$ 0	$ (127)
Receive Rate	0.00%	0.229%
Weighted Average Pay Rate	0.00%	2.255%
Interest Rate Swap due May 10, 2021
Derivatives, Fair Value [Line Items]
Notional Amount	$ 20,667
Notional Amount		$ 21,667
Fair Value	$ (37)	$ (91)
Receive Rate	2.606%	2.649%
Weighted Average Pay Rate	3.674%	3.674%
Interest Rate Swap Due July 24, 2028
Derivatives, Fair Value [Line Items]
Notional Amount	$ 22,000	$ 22,750
Fair Value	$ (1,669)	$ (2,220)
Receive Rate	2.607%	2.643%
Weighted Average Pay Rate	5.425%	5.425%
Interest Rate Swap due June 15, 2024
Derivatives, Fair Value [Line Items]
Notional Amount	$ 20,000	$ 20,000
Fair Value	$ (1,194)	$ (1,482)
Receive Rate	0.184%	0.217%
Weighted Average Pay Rate	2.39%	2.39%
Interest Rate Swap due March 1, 2024
Derivatives, Fair Value [Line Items]
Notional Amount	$ 20,000	$ 20,000
Fair Value	$ (1,144)	$ (1,385)
Receive Rate	0.225%	0.225%
Weighted Average Pay Rate	2.352%	2.352%
Interest Rate Swap Due June 15, 2021
Derivatives, Fair Value [Line Items]
Notional Amount	$ 6,000	$ 6,000
Fair Value	$ (26)	$ (50)
Receive Rate	0.184%	0.217%
Weighted Average Pay Rate	1.866%	1.866%
Interest Rate Swap Due June 30, 2021
Derivatives, Fair Value [Line Items]
Notional Amount	$ 3,000	$ 3,000
Fair Value	$ (13)	$ (25)
Receive Rate	0.184%	0.241%
Weighted Average Pay Rate	1.878%	1.878%

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS (Cash flow hedges gains (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	$ 1,888	$ (3,680)
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	597	190
Interest rate swaps
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Recognized in OCI, Amount of Gain (Loss)	1,297	(3,863)
Interest rate swaps | Interest expense
Trading Activity, Gains and Losses, Net [Line Items]
Effective Portion, Reclassified from AOCI into Income, Amount of Gain (Loss)	591	183
Interest rate swaps | Other income
Trading Activity, Gains and Losses, Net [Line Items]
Ineffective Portion, Recognized in Income on Derivatives, Amount of Gain (Loss)	$ 0	$ 0

DERIVATIVE FINANCIAL INSTRUME_7

DERIVATIVE FINANCIAL INSTRUMENTS (Fair value hedges narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Cash pledged as collateral	$ 2.9	$ 3.8
Fair Value Hedging | Interest Rate Swaps
Derivative [Line Items]
Cash pledged as collateral	$ 3.8	$ 4.2

DERIVATIVE FINANCIAL INSTRUME_8

DERIVATIVE FINANCIAL INSTRUMENTS (Fair value hedges balance sheet category and fair values) (Details) - Fair value hedges - Other liabilities - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional Amount	$ 20,734	$ 20,841
Fair Value	$ (1,717)	$ (2,480)

DERIVATIVE FINANCIAL INSTRUME_9

DERIVATIVE FINANCIAL INSTRUMENTS (Fair value hedges gans (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair value hedges | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss)	$ 763	$ (1,677)

DERIVATIVE FINANCIAL INSTRUM_10

DERIVATIVE FINANCIAL INSTRUMENTS (Embedded derivatives blance sheet category and fair values) (Details) - Embedded derivatives - Other assets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional Amount	$ 9,084	$ 9,198
Fair Value	$ 551	$ 680

DERIVATIVE FINANCIAL INSTRUM_11

DERIVATIVE FINANCIAL INSTRUMENTS (Embedded derivatives gain (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other noninterest income | Embedded derivatives
Derivative [Line Items]
Amount of Gain (Loss)	$ (129)	$ 361

DERIVATIVE FINANCIAL INSTRUM_12

DERIVATIVE FINANCIAL INSTRUMENTS (Back-to-back loan swaps narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative [Line Items]
Cash pledged as collateral	$ 2,900,000		$ 3,800,000
Counterparties
Derivative [Line Items]
Cash pledged as collateral	0		0
Back-to-Back Loan Swaps | Interest Rate Swaps
Derivative [Line Items]
Cash pledged as collateral	27,900,000		46,500,000
Back-to-Back Loan Swaps | Interest Rate Swaps | Interest income
Derivative [Line Items]
Gain (loss) recognized	0	$ 0
Back-to-Back Loan Swaps | Interest Rate Swaps | Counterparties
Derivative [Line Items]
Cash pledged as collateral	$ 0		$ 0

DERIVATIVE FINANCIAL INSTRUM_13

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, 2021	Dec. 31, 2020
Other assets
Derivative [Line Items]
Notional Amount	$ 444,056	$ 440,719
Fair Value	23,440	43,422
Other liabilities
Derivative [Line Items]
Notional Amount	444,056	440,719
Fair Value	$ (23,440)	$ (43,422)
Weighted Average Receive Rate | Other assets
Derivative [Line Items]
Weighted Average Rate	4.51%	4.46%
Weighted Average Receive Rate | Other liabilities
Derivative [Line Items]
Weighted Average Rate	2.48%	2.46%
Weighted Average Pay Rate | Other assets
Derivative [Line Items]
Weighted Average Rate	2.48%	2.46%
Weighted Average Pay Rate | Other liabilities
Derivative [Line Items]
Weighted Average Rate	4.51%	4.46%

DERIVATIVE FINANCIAL INSTRUM_14

DERIVATIVE FINANCIAL INSTRUMENTS (Other free standing derivatives narrative) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Cash pledged as collateral	$ 2,900,000	$ 3,800,000
Counterparties
Derivative [Line Items]
Cash pledged as collateral	0	0
Not Designated as Hedging Instrument
Derivative [Line Items]
Cash pledged as collateral	0	0
Not Designated as Hedging Instrument | Counterparties
Derivative [Line Items]
Cash pledged as collateral	$ 0	$ 0

DERIVATIVE FINANCIAL INSTRUM_15

DERIVATIVE FINANCIAL INSTRUMENTS (Other free standing derivatives balance sheet category and fair values) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other assets | Interest rate lock commitments (mortgage)
Derivatives, Fair Value [Line Items]
Notional Amount	$ 54,369	$ 42,078
Fair Value	1,857	1,827
Other assets | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount	83,500	0
Fair Value	1,213	0
Other liabilities | Forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount	2,000	86,500
Fair Value	(4)	(697)
Other liabilities | Undesignated interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount	9,084	9,198
Fair Value	$ (551)	$ (680)

DERIVATIVE FINANCIAL INSTRUM_16

DERIVATIVE FINANCIAL INSTRUMENTS (Other free standing derivatives gains (losses) recognized) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net gains on sale of loans held for sale | Interest rate lock commitments (mortgage)
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	$ (1,485)	$ 1,698
Net gains on sale of loans held for sale | Forward commitments
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	1,906	(1,146)
Other noninterest income | Undesignated interest rate swaps
Trading Activity, Gains and Losses, Net [Line Items]
Gain (Loss) Recognized	$ 129	$ (361)

FAIR VALUE (Fair value measurem

FAIR VALUE (Fair value measurement recurring) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Equity securities with a readily determinable fair value	$ 20,543
Level 1
Assets
Securities available for sale	1,019	$ 2,026
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Level 2
Assets
Securities available for sale	6,369,476	6,125,949
Derivative assets	23,991	44,102
Liabilities
Derivative liabilities	29,791	51,962
Level 3
Assets
Securities available for sale	0	0
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Forward commitments | Level 1
Assets
Derivative assets	0
Forward commitments | Level 2
Assets
Derivative assets	1,213
Forward commitments | Level 3
Assets
Derivative assets	0
U.S. treasuries
Assets
Securities available for sale	1,019	2,026
U.S. agencies
Assets
Securities available for sale	212,292	166,779
Obligations of states and political subdivisions
Assets
Securities available for sale	1,737,989	1,635,227
Commercial mortgage-backed securities - agency
Assets
Securities available for sale	122,230	174,153
Commercial mortgage-backed securities - non-agency
Assets
Securities available for sale	307,774	252,767
Asset-backed securities
Assets
Securities available for sale	1,028,213	1,069,266
Corporate bonds
Assets
Securities available for sale	3,790	3,742
Recurring Basis
Assets
Equity securities with a readily determinable fair value	20,543	19,629
Total assets at fair value	6,397,556	6,173,904
Liabilities
Total liabilities at fair value	29,795	52,659
Recurring Basis | Level 1
Assets
Equity securities with a readily determinable fair value	0	0
Total assets at fair value	1,019	2,026
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Level 2
Assets
Equity securities with a readily determinable fair value	20,543	19,629
Total assets at fair value	6,394,680	6,170,051
Liabilities
Total liabilities at fair value	29,795	52,659
Recurring Basis | Level 3
Assets
Equity securities with a readily determinable fair value	0	0
Total assets at fair value	1,857	1,827
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Derivative financial instruments
Assets
Derivative assets	23,991	44,102
Liabilities
Derivative liabilities	29,791	51,962
Recurring Basis | Derivative financial instruments | Level 1
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | Derivative financial instruments | Level 2
Assets
Derivative assets	23,991	44,102
Liabilities
Derivative liabilities	29,791	51,962
Recurring Basis | Derivative financial instruments | Level 3
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | Interest rate lock commitments
Assets
Derivative assets	1,857	1,827
Recurring Basis | Interest rate lock commitments | Level 1
Assets
Derivative assets	0	0
Recurring Basis | Interest rate lock commitments | Level 2
Assets
Derivative assets	0	0
Recurring Basis | Interest rate lock commitments | Level 3
Assets
Derivative assets	1,857	1,827
Recurring Basis | Forward commitments
Assets
Derivative assets	1,213
Liabilities
Derivative liabilities	4	697
Recurring Basis | Forward commitments | Level 1
Assets
Derivative assets	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | Forward commitments | Level 2
Assets
Derivative assets	1,213
Liabilities
Derivative liabilities	4	697
Recurring Basis | Forward commitments | Level 3
Assets
Derivative assets	0
Liabilities
Derivative liabilities	0	0
Recurring Basis | U.S. treasuries
Assets
Securities available for sale	1,019	2,026
Recurring Basis | U.S. treasuries | Level 1
Assets
Securities available for sale	1,019	2,026
Recurring Basis | U.S. treasuries | Level 2
Assets
Securities available for sale	0	0
Recurring Basis | U.S. treasuries | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | U.S. agencies
Assets
Securities available for sale	212,292	166,779
Recurring Basis | U.S. agencies | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | U.S. agencies | Level 2
Assets
Securities available for sale	212,292	166,779
Recurring Basis | U.S. agencies | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Obligations of states and political subdivisions
Assets
Securities available for sale	1,737,989	1,635,227
Recurring Basis | Obligations of states and political subdivisions | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Obligations of states and political subdivisions | Level 2
Assets
Securities available for sale	1,737,989	1,635,227
Recurring Basis | Obligations of states and political subdivisions | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - agency
Assets
Securities available for sale	1,432,929	1,355,270
Recurring Basis | Mortgage-backed securities - agency | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - agency | Level 2
Assets
Securities available for sale	1,432,929	1,355,270
Recurring Basis | Mortgage-backed securities - agency | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - non-agency
Assets
Securities available for sale	1,503,716	1,449,116
Recurring Basis | Mortgage-backed securities - non-agency | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - non-agency | Level 2
Assets
Securities available for sale	1,503,716	1,449,116
Recurring Basis | Mortgage-backed securities - non-agency | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - agency
Assets
Securities available for sale	122,230	174,153
Recurring Basis | Commercial mortgage-backed securities - agency | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - agency | Level 2
Assets
Securities available for sale	122,230	174,153
Recurring Basis | Commercial mortgage-backed securities - agency | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - non-agency
Assets
Securities available for sale	307,774	252,767
Recurring Basis | Commercial mortgage-backed securities - non-agency | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - non-agency | Level 2
Assets
Securities available for sale	307,774	252,767
Recurring Basis | Commercial mortgage-backed securities - non-agency | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Asset-backed securities
Assets
Securities available for sale	1,028,213	1,069,266
Recurring Basis | Asset-backed securities | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Asset-backed securities | Level 2
Assets
Securities available for sale	1,028,213	1,069,266
Recurring Basis | Asset-backed securities | Level 3
Assets
Securities available for sale	0	0
Recurring Basis | Corporate bonds
Assets
Securities available for sale	3,790	3,742
Recurring Basis | Corporate bonds | Level 1
Assets
Securities available for sale	0	0
Recurring Basis | Corporate bonds | Level 2
Assets
Securities available for sale	3,790	3,742
Recurring Basis | Corporate bonds | 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, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 6,236	$ 6,624
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	43,037	57,949
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	31,175	34,488
Loans held for sale	43,037	57,949
Other real estate owned	6,236	6,624
Fair Value, Measurements, Nonrecurring | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing rights	6,218	5,189
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	7,633	6,499
Fair Value, Measurements, Nonrecurring | Changes Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	859	12,082
Loans held for sale	(1,121)	(982)
Other real estate owned	(154)	1,044
Fair Value, Measurements, Nonrecurring | Changes Measurement | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing rights	(917)	1,778
Fair Value, Measurements, Nonrecurring | Changes Measurement | 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	3,288
Fair Value, Measurements, Nonrecurring | 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 | Level 1 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing rights	0	0
Fair Value, Measurements, Nonrecurring | 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 | 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	43,037	57,949
Other real estate owned	0	0
Fair Value, Measurements, Nonrecurring | Level 2 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing rights	0	0
Fair Value, Measurements, Nonrecurring | 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 | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	31,175	34,488
Loans held for sale	0	0
Other real estate owned	6,236	6,624
Fair Value, Measurements, Nonrecurring | Level 3 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing rights	6,218	5,189
Fair Value, Measurements, Nonrecurring | 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	7,633	6,499
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	7,271	12,451
Fair Value, Measurements, Nonrecurring | Agricultural and agricultural real estate | Changes Measurement
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 | 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 | 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 | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	7,271	12,451
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	10,621	11,256
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Changes Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	859	451
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Commercial and industrial | 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 | 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 | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	10,621	11,256
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Owner occupied commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	1,233	5,874
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Owner occupied commercial real estate | Changes Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	11,631
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Owner occupied commercial real estate | 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 | Owner occupied commercial real estate | 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 | Owner occupied commercial real estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	1,233	5,874
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Non-owner occupied commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	12,050	4,907
Commercial and industrial | Fair Value, Measurements, Nonrecurring | Non-owner occupied commercial real estate | Changes Measurement
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 | Non-owner occupied commercial real estate | 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 | Non-owner occupied commercial real estate | 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 | Non-owner occupied commercial real estate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	12,050	4,907
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	0	0
Real estate construction | Fair Value, Measurements, Nonrecurring | Commercial and industrial | Changes Measurement
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 | 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 | 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 | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$ 0	$ 0

FAIR VALUE (Quantitative Inform

FAIR VALUE (Quantitative Information about Level 3 fair value measurements) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Interest rate lock commitments | Recurring Basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,857	$ 1,827
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0	0
Level 3 | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1,857	1,827
Level 3 | Discounted cash flows
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	6,218	5,189
Level 3 | Modified appraised value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	6,236	6,624
Level 3 | Modified appraised value | Agricultural and agricultural real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	7,271	12,451
Level 3 | Modified appraised value | Premises, furniture and equipment held for sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale	7,633
Level 3 | Modified appraised value | Premises, furniture and equipment held for sale | Recurring Basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Premises, furniture and equipment held for sale		6,499
Level 3 | Interest rate lock commitments | Recurring Basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1,857	1,827
Level 3 | Interest rate lock commitments | Discounted cash flows
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,857	$ 1,827
Closing ratio | Level 3 | Discounted cash flows | Weighted Average | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.88	0.86
Closing ratio | Level 3 | Discounted cash flows | Minimum | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0	0
Closing ratio | Level 3 | Discounted cash flows | Maximum | Interest rate lock commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input	0.99	0.99
Appraisal discount | Level 3 | Modified appraised value | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	0.00%	0.00%
Appraisal discount | Level 3 | Modified appraised value | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	10.00%	10.00%
Appraisal discount | Level 3 | Modified appraised value | Premises, furniture and equipment held for sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate		0.00%
Appraisal discount | Level 3 | Modified appraised value | Premises, furniture and equipment held for sale | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	10.00%	10.00%
Commercial and industrial | Level 3 | Modified appraised value | Commercial and industrial
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 10,621	$ 11,256
Commercial and industrial | Level 3 | Modified appraised value | Owner occupied commercial real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	1,233	5,874
Commercial and industrial | Level 3 | Modified appraised value | Non-owner occupied commercial real estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	$ 12,050	$ 4,907
Commercial and industrial | Appraisal discount | Level 3 | Modified appraised value | Commercial and industrial | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	0.00%	0.00%
Commercial and industrial | Appraisal discount | Level 3 | Modified appraised value | Commercial and industrial | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	7.00%	8.00%
Commercial and industrial | Appraisal discount | Level 3 | Modified appraised value | Owner occupied commercial real estate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	0.00%	0.00%
Commercial and industrial | Appraisal discount | Level 3 | Modified appraised value | Owner occupied commercial real estate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	12.00%	12.00%
Commercial and industrial | Appraisal discount | Level 3 | Modified appraised value | Non-owner occupied commercial real estate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	0.00%	0.00%
Commercial and industrial | Appraisal discount | Level 3 | Modified appraised value | Non-owner occupied commercial real estate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	10.00%	10.00%
Agricultural and agricultural real estate | Appraisal discount | Level 3 | Modified appraised value | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	0.00%	0.00%
Agricultural and agricultural real estate | Appraisal discount | Level 3 | Modified appraised value | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing assets, discount rate	9.00%	10.00%

FAIR VALUE (Changes Level 3 ass

FAIR VALUE (Changes Level 3 assets fair value, recurring) (Details) - Interest rate lock commitments - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,827	$ 681
Total net gains included in earnings	(1,485)	2,803
Issuances	5,279	17,221
Settlements	(3,764)	(18,878)
Balance at period end	$ 1,857	$ 1,827

FAIR VALUE (Estimated fair valu

FAIR VALUE (Estimated fair value financial instruments incl. carrying amounts) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Securities:
Held to maturity	$ 95,082	$ 100,041
Level 1
Financial assets:
Cash and cash equivalents	467,862	337,903
Time deposits in other financial institutions	3,138	3,129
Securities:
Carried at fair value	1,019	2,026
Held to maturity	0	0
Other investments	0	0
Loans held for sale	0	0
Loans, net	0	0
Cash surrender value on life insurance	0	0
Derivative assets	0	0
Financial liabilities:
Short term borrowings	0	0
Other borrowings	0	0
Derivative liabilities	0	0
Level 1 | Interest rate lock commitments
Securities:
Derivative assets	0	0
Level 1 | Demand deposits
Financial liabilities:
Deposits	0	0
Level 1 | Savings deposits
Financial liabilities:
Deposits	0	0
Level 1 | Time deposits
Financial liabilities:
Deposits	0	0
Level 1 | Forward commitments
Financial liabilities:
Derivative liabilities	0	0
Level 2
Financial assets:
Cash and cash equivalents	0	0
Time deposits in other financial institutions	0	0
Securities:
Carried at fair value	6,369,476	6,125,949
Held to maturity	95,082	100,041
Other investments	74,935	75,523
Loans held for sale	43,037	57,949
Loans, net	9,852,310	9,735,181
Cash surrender value on life insurance	188,521	187,664
Derivative assets	23,991	44,102
Financial liabilities:
Short term borrowings	140,597	167,872
Other borrowings	350,964	458,806
Derivative liabilities	29,791	51,962
Level 2 | Interest rate lock commitments
Securities:
Derivative assets	0	0
Level 2 | Demand deposits
Financial liabilities:
Deposits	6,175,946	5,688,810
Level 2 | Savings deposits
Financial liabilities:
Deposits	819,251	8,019,704
Level 2 | Time deposits
Financial liabilities:
Deposits	1,203,854	1,273,468
Level 2 | Forward commitments
Financial liabilities:
Derivative liabilities	4	697
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	31,175	34,488
Cash surrender value on life insurance	0	0
Derivative assets	0	0
Financial liabilities:
Short term borrowings	0	0
Other borrowings	0	0
Derivative liabilities	0	0
Level 3 | Interest rate lock commitments
Securities:
Derivative assets	1,857	1,827
Level 3 | Demand deposits
Financial liabilities:
Deposits	0	0
Level 3 | Savings deposits
Financial liabilities:
Deposits	0	0
Level 3 | Time deposits
Financial liabilities:
Deposits	0	0
Level 3 | Forward commitments
Financial liabilities:
Derivative liabilities	0	0
Commercial and industrial | Level 1 | Commercial and industrial
Securities:
Loans, net	0	0
Commercial and industrial | Level 1 | Real estate construction
Securities:
Loans, net	0	0
Commercial and industrial | Level 2 | Commercial and industrial
Securities:
Loans, net	2,358,274	2,379,785
Commercial and industrial | Level 2 | Real estate construction
Securities:
Loans, net	782,155	849,224
Commercial and industrial | Level 3 | Commercial and industrial
Securities:
Loans, net	10,621	11,256
Commercial and industrial | Level 3 | Real estate construction
Securities:
Loans, net	0	0
Paycheck Protection Program ("PPP") | Level 1 | Commercial and industrial
Securities:
Loans, net	0	0
Paycheck Protection Program ("PPP") | Level 2 | Commercial and industrial
Securities:
Loans, net	1,155,328	957,785
Paycheck Protection Program ("PPP") | Level 3 | Commercial and industrial
Securities:
Loans, net	0	0
Owner occupied commercial real estate | Level 1 | Commercial and industrial
Securities:
Loans, net	0	0
Owner occupied commercial real estate | Level 2 | Commercial and industrial
Securities:
Loans, net	1,802,788	1,739,523
Owner occupied commercial real estate | Level 3 | Commercial and industrial
Securities:
Loans, net	1,233	5,874
Non-owner occupied commercial real estate | Level 1 | Commercial and industrial
Securities:
Loans, net	0	0
Non-owner occupied commercial real estate | Level 2 | Commercial and industrial
Securities:
Loans, net	1,921,571	1,887,306
Non-owner occupied commercial real estate | Level 3 | Commercial and industrial
Securities:
Loans, net	12,050	4,907
Agricultural and agricultural real estate | Level 1
Securities:
Loans, net	0	0
Agricultural and agricultural real estate | Level 2
Securities:
Loans, net	662,443	685,278
Agricultural and agricultural real estate | Level 3
Securities:
Loans, net	7,271	12,451
Residential real estate | Level 1
Securities:
Loans, net	0	0
Residential real estate | Level 2
Securities:
Loans, net	775,020	828,366
Residential real estate | Level 3
Securities:
Loans, net	0	0
Consumer | Level 1
Securities:
Loans, net	0	0
Consumer | Level 2
Securities:
Loans, net	394,731	407,914
Consumer | Level 3
Securities:
Loans, net	0	0
Carrying Amount
Financial assets:
Cash and cash equivalents	467,862	337,903
Time deposits in other financial institutions	3,138	3,129
Securities:
Carried at fair value	6,370,495	6,127,975
Held to maturity	85,293	88,839
Other investments	74,935	75,253
Loans held for sale	43,037	57,949
Loans, net	9,920,284	9,891,445
Cash surrender value on life insurance	188,521	187,664
Derivative assets	23,991	44,102
Financial liabilities:
Short term borrowings	140,597	167,872
Other borrowings	349,514	457,042
Derivative liabilities	29,791	51,962
Carrying Amount | Interest rate lock commitments
Securities:
Derivative assets	1,857	1,827
Carrying Amount | Demand deposits
Financial liabilities:
Deposits	6,175,946	5,688,810
Carrying Amount | Savings deposits
Financial liabilities:
Deposits	8,179,251	8,019,704
Carrying Amount | Time deposits
Financial liabilities:
Deposits	1,203,854	1,271,391
Carrying Amount | Forward commitments
Financial liabilities:
Derivative liabilities	4	697
Carrying Amount | Commercial and industrial | Commercial and industrial
Securities:
Loans, net	2,385,165	2,495,981
Carrying Amount | Commercial and industrial | Real estate construction
Securities:
Loans, net	776,096	843,140
Carrying Amount | Paycheck Protection Program ("PPP") | Commercial and industrial
Securities:
Loans, net	1,155,328	957,785
Carrying Amount | Owner occupied commercial real estate | Commercial and industrial
Securities:
Loans, net	1,818,143	1,756,405
Carrying Amount | Non-owner occupied commercial real estate | Commercial and industrial
Securities:
Loans, net	1,942,489	1,900,608
Carrying Amount | Agricultural and agricultural real estate
Securities:
Loans, net	676,858	707,397
Carrying Amount | Residential real estate
Securities:
Loans, net	775,982	828,507
Carrying Amount | Consumer
Securities:
Loans, net	390,223	401,622
Estimated Fair Value
Financial assets:
Cash and cash equivalents	467,862	337,903
Time deposits in other financial institutions	3,138	3,129
Securities:
Carried at fair value	6,370,495	6,127,975
Held to maturity	95,082	100,041
Other investments	74,935	75,523
Loans held for sale	43,037	57,949
Loans, net	9,883,485	9,769,669
Cash surrender value on life insurance	188,521	187,664
Derivative assets	23,991	44,102
Financial liabilities:
Short term borrowings	140,597	167,872
Other borrowings	350,964	458,806
Derivative liabilities	29,791	51,962
Estimated Fair Value | Interest rate lock commitments
Securities:
Derivative assets	1,857	1,827
Estimated Fair Value | Demand deposits
Financial liabilities:
Deposits	6,175,946	5,688,810
Estimated Fair Value | Savings deposits
Financial liabilities:
Deposits	819,251	8,019,704
Estimated Fair Value | Time deposits
Financial liabilities:
Deposits	1,203,854	1,273,468
Estimated Fair Value | Forward commitments
Financial liabilities:
Derivative liabilities	4	697
Estimated Fair Value | Commercial and industrial | Commercial and industrial
Securities:
Loans, net	2,368,895	2,391,041
Estimated Fair Value | Commercial and industrial | Real estate construction
Securities:
Loans, net	782,155	849,224
Estimated Fair Value | Paycheck Protection Program ("PPP") | Commercial and industrial
Securities:
Loans, net	1,155,328	957,785
Estimated Fair Value | Owner occupied commercial real estate | Commercial and industrial
Securities:
Loans, net	1,804,021	1,745,397
Estimated Fair Value | Non-owner occupied commercial real estate | Commercial and industrial
Securities:
Loans, net	1,933,621	1,892,213
Estimated Fair Value | Agricultural and agricultural real estate
Securities:
Loans, net	669,714	697,729
Estimated Fair Value | Residential real estate
Securities:
Loans, net	775,020	828,366
Estimated Fair Value | Consumer
Securities:
Loans, net	394,731	$ 407,914
Forward commitments | Level 1
Securities:
Derivative assets	0
Forward commitments | Level 2
Securities:
Derivative assets	1,213
Forward commitments | Level 3
Securities:
Derivative assets	0
Forward commitments | Carrying Amount
Securities:
Derivative assets	1,213
Forward commitments | Estimated Fair Value
Securities:
Derivative assets	$ 1,213

FAIR VALUE (Deposits held for s

FAIR VALUE (Deposits held for sale narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains included in gains (losses) on sale of loans held for sale attributable to interest rate lock commitments	$ 5,908	$ 4,660
Interest rate lock commitments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gains included in gains (losses) on sale of loans held for sale attributable to interest rate lock commitments	$ 1,900		$ 1,800

REVENUE (Details)

REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	$ 20,301	$ 17,776
Loan servicing income	838	963
Securities gains (losses), net	(30)	1,658
Unrealized loss on equity securities, net	(110)	(231)
Net gains on sale of loans held for sale	6,420	4,660
Valuation adjustment on servicing rights	917	(1,565)
Income on bank owned life insurance	829	498
Other noninterest income	1,152	2,058
Total noninterest income out-of-scope of Topic 606	10,016	8,041
TOTAL NONINTEREST INCOME	30,317	25,817
Service charges and fees on deposit accounts
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	3,936	3,438
Overdraft fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	2,592	2,809
Customer service and other service fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	46	59
Credit card fee income
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	4,308	3,900
Debit card income
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	2,789	1,815
Total service charges and fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	13,671	12,021
Trust fees
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	5,777	5,022
Brokerage and insurance commissions
Disaggregation of Revenue [Line Items]
Service charges and fees on deposit accounts	$ 853	$ 733

STOCK COMPENSATION (Narrative)

STOCK COMPENSATION (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefit related to share-based payment awards	$ 153	$ 25
Share-based compensation, period before change in control	6 months
Time-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods	3 years		3 years
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, award vesting periods	3 years	3 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs	$ 2,700	$ 2,200
Share-based unrecognized compensation costs	$ 11,900
Long-Term Incentive Plan 2012
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)	1,239,003
Long-Term Incentive Plan 2012 | Time-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted (in shares)	104,462	114,944
Long-Term Incentive Plan 2012 | Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted (in shares)	60,339	50,787
Share-based compensation, vesting percentage after change in control	100.00%
Share-based compensation, vesting period after change in control	24 months
Long-Term Incentive Plan 2012 | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, granted (in shares)	3,778	0

STOCK COMPENSATION (Summary of

STOCK COMPENSATION (Summary of RSUs Activity) (Details) - RSUs - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Shares
Outstanding at beginning of period (in shares)	348,275	254,383
Granted (in shares)	170,317	165,731
Vested (in shares)	(106,255)	(86,441)
Forfeited (in shares)	(4,215)	(11,929)
Outstanding at end of period (in shares)	408,122	321,744
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 38.22	$ 46.76
Granted (in dollars per share)	52.08	32.57
Vested (in dollars per share)	44.14	45.48
Forfeited (in dollars per share)	50.59	48.38
Outstanding at end of period (in dollars per share)	$ 42.11	$ 40.14