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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Gross Unrealized Gains and Losses and Estimated Fair Value of Investment 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 as of December 31, 2023, and December 31, 2022, are summarized in the table below, in thousands:
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
December 31, 2023    
U.S. treasuries$32,459 $— $(341)$32,118 
U.S. agencies14,724 — (194)14,530 
Obligations of states and political subdivisions839,754 25 (98,534)741,245 
Mortgage-backed securities - agency1,620,409 13 (226,793)1,393,629 
Mortgage-backed securities - non-agency1,616,414 363 (87,649)1,529,128 
Commercial mortgage-backed securities - agency76,076 — (11,288)64,788 
Commercial mortgage-backed securities - non-agency526,974 — (12,116)514,858 
Asset-backed securities232,140 — (14,770)217,370 
Corporate bonds120,338 — (2,169)118,169 
Total debt securities5,079,288 401 (453,854)4,625,835 
Equity securities with a readily determinable fair value21,056 — — 21,056 
Total$5,100,344 $401 $(453,854)$4,646,891 
December 31, 2022
U.S. treasuries$32,369 $8 $(678)$31,699 
U.S. agencies49,437 — (6,302)43,135 
Obligations of states and political subdivisions1,049,578 14 (170,155)879,437 
Mortgage-backed securities - agency2,042,092 56 (270,043)1,772,105 
Mortgage-backed securities - non-agency2,327,308 1,417 (146,849)2,181,876 
Commercial mortgage-backed securities - agency100,518 — (15,395)85,123 
Commercial mortgage-backed securities - non-agency679,511 — (20,052)659,459 
Asset-backed securities428,397 — (12,343)416,054 
Corporate bonds59,205 — (1,263)57,942 
Total debt securities6,768,415 1,495 (643,080)6,126,830 
Equity securities20,314 — — 20,314 
Total$6,788,729 $1,495 $(643,080)$6,147,144 
The amortized cost and estimated fair value of investment securities carried at fair value at December 31, 2023, 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.
December 31, 2023
Amortized CostEstimated Fair Value
Due in 1 year or less$25,138 $24,897 
Due in 1 to 5 years62,537 61,413 
Due in 5 to 10 years20,231 18,036 
Due after 10 years899,369 801,716 
    Total debt securities1,007,275 906,062 
Mortgage and asset-backed securities4,072,013 3,719,773 
Equity securities with a readily determinable fair value 21,056 21,056 
Total investment securities$5,100,344 $4,646,891 
Schedule of Securities Held to Maturity
The amortized cost, gross unrealized gains and losses and estimated fair values of held to maturity securities as of December 31, 2023, and December 31, 2022, are summarized in the table below, in thousands:
 
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Allowance for Credit Losses
December 31, 2023    
Obligations of states and political subdivisions$838,241 $3,622 $(25,464)$816,399 $— 
Total$838,241 $3,622 $(25,464)$816,399 $— 
December 31, 2022
Obligations of states and political subdivisions$829,403 $3,096 $(55,942)$776,557 $— 
Total$829,403 $3,096 $(55,942)$776,557 $— 
The amortized cost and estimated fair value of debt securities held to maturity at December 31, 2023, 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.
December 31, 2023
Amortized CostEstimated Fair Value
Due in 1 year or less$8,116 $8,126 
Due in 1 to 5 years88,728 88,646 
Due in 5 to 10 years158,686 158,430 
Due after 10 years582,711 561,197 
Total investment securities$838,241 $816,399 
Securities held to maturityLess than 12 months12 months or longerTotal
Fair
 Value		Unrealized
Losses		CountFair
 Value		Unrealized
Losses		CountFair
Value		Unrealized
Losses		Count
December 31, 2023
Obligations of states and political subdivisions$145,471 $(3,706)23 $569,691 $(21,758)126 $715,162 $(25,464)149 
Total temporarily impaired securities$145,471 $(3,706)23$569,691 $(21,758)126$715,162 $(25,464)149 
December 31, 2022
Obligations of states and political subdivisions$697,424 $(55,942)155 $— $— — $697,424 $(55,942)155 
Total temporarily impaired securities$697,424 $(55,942)155$— $— $697,424 $(55,942)155 
Schedule of Realized Gross Gains and Losses on Sales of Securities Available for Sale
Gross gains and losses realized related to sales of securities carried at fair value for the years ended December 31, 2023, 2022 and 2021 are summarized as follows, in thousands:
For the Years Ended December 31,
 202320222021
Proceeds from sales$1,196,586 $1,048,525 $1,475,598 
Gross security gains589 7,299 11,892 
Gross security losses141,966 9,191 5,982 
Schedule of Available for Sale Securities
The following tables summarize, 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 HTLF's securities portfolio as of December 31, 2023, and December 31, 2022. 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 or more months. The reference point for determining how long an investment was in an unrealized loss position was December 31, 2023, and December 31, 2022, respectively. For securities transferred to held to maturity during the third quarter of 2022, the reference point was the date of transfer.
Debt securities available for saleLess than 12 months12 months or longerTotal
 Fair
Value		Unrealized
Losses		CountFair
Value		Unrealized
Losses		CountFair
Value		Unrealized
Losses		Count
December 31, 2023
U.S. treasuries$2,985 $(12)1 $26,138 $(329)3 $29,123 $(341)4 
U.S. agencies$— $— — $14,530 $(194)4 $14,530 $(194)4 
Obligations of states and political subdivisions1,440 (65)1 736,653 (98,469)150 738,093 (98,534)151 
Mortgage-backed securities - agency194 (2)2 1,392,769 (226,791)166 1,392,963 (226,793)168 
Mortgage-backed securities - non-agency415,934 (24,568)12 902,291 (63,081)35 1,318,225 (87,649)47 
Commercial mortgage-backed securities - agency— — — 64,788 (11,288)17 64,788 (11,288)17 
Commercial mortgage-backed securities - non-agency— — — 507,044 (12,116)16 507,044 (12,116)16 
Asset-backed securities148,063 (9,723)4 69,307 (5,047)7 217,370 (14,770)11 
Corporate bonds61,031 (111)1 57,138 (2,058)8 118,169 (2,169)9 
Total temporarily impaired securities$629,647 $(34,481)21 $3,770,658 $(419,373)406 $4,400,305 $(453,854)427 
December 31, 2022
U.S. treasuries$28,699 $(678)4 $— $— — $28,699 $(678)4 
U.S. agencies$16,487 $(222)5 $26,648 $(6,080)2 $43,135 $(6,302)7 
Obligations of states and political subdivisions288,457 (28,378)69 589,641 (141,777)113 878,098 (170,155)182 
Mortgage-backed securities - agency241,288 (21,420)99 1,528,951 (248,623)126 1,770,239 (270,043)225 
Mortgage-backed securities - non-agency950,054 (70,213)25 693,531 (76,636)25 1,643,585 (146,849)50 
Commercial mortgage-backed securities - agency27,732 (2,291)12 57,392 (13,104)7 85,124 (15,395)19 
Commercial mortgage-backed securities - non-agency530,541 (16,830)15 84,619 (3,222)4 615,160 (20,052)19 
Asset-backed securities118,613 (6,107)7 56,621 (6,236)6 175,234 (12,343)13 
Corporate bonds57,544 (1,257)7 398 (6)1 57,942 (1,263)8 
Total temporarily impaired securities$2,259,415 $(147,396)243 $3,037,801 $(495,684)284 $5,297,216 $(643,080)527 
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 December 31, 2023 and December 31, 2022, which are updated quarterly and used to monitor the credit quality of the securities:
December 31, 2023December 31, 2022
Rating
AAA$88,550 $79,598 
AA, AA+, AA-583,816 588,354 
A+, A, A-139,658 136,624 
BBB20,133 20,623 
Not Rated6,084 4,204 
Total $838,241 $829,403 
The following tables show the risk category of loans by loan category and year of origination as of December 31, 2023 and December 31, 2022, in thousands:
As of December 31, 2023Amortized Cost Basis of Term Loans by Year of Origination
202320222021202020192018 and PriorRevolvingTotal
Commercial and industrial
Pass$608,030 $779,218 $333,900 $187,406 $78,455 $327,775 $1,159,397 $3,474,181 
As of December 31, 2023Amortized Cost Basis of Term Loans by Year of Origination
202320222021202020192018 and PriorRevolvingTotal
Watch20,694 19,788 257 3,631 2,398 2,953 28,749 78,470 
Substandard20,171 12,658 2,636 5,447 18,535 7,489 32,460 99,396 
Commercial and industrial total$648,895 $811,664 $336,793 $196,484 $99,388 $338,217 $1,220,606 $3,652,047 
Commercial and industrial charge-offs2457946801,4255631,9492,9668,622
PPP
Pass$— $— $2,591 $50 $— $— $— $2,641 
Watch — — 89 — — — — 89 
Substandard— — 47 — — — — 47 
PPP total$— $— $2,727 $50 $— $— $— $2,777 
PPP charge-offs— — — — — — — — 
Owner occupied commercial real estate
Pass$443,683 $547,898 $799,978 $225,257 $225,405 $224,608 $41,072 $2,507,901 
Watch8,052 25,947 13,114 2,662 8,115 7,553 — 65,443 
Substandard31,904 10,489 2,268 11,609 6,390 2,171 — 64,831 
Owner occupied commercial real estate total$483,639 $584,334 $815,360 $239,528 $239,910 $234,332 $41,072 $2,638,175 
Owner occupied commercial real estate charge-offs— 802 — 5 — 63 — 870 
Non-owner occupied commercial real estate
Pass$480,683 $656,824 $423,420 $203,330 $262,541 $251,499 $26,978 $2,305,275 
Watch71,400 34,651 8,237 3,834 27,345 57,083 — 202,550 
Substandard5,043 952 1,391 — 4,238 34,262 — 45,886 
Non-owner occupied commercial real estate total$557,126 $692,427 $433,048 $207,164 $294,124 $342,844 $26,978 $2,553,711 
As of December 31, 2023Amortized Cost Basis of Term Loans by Year of Origination
202320222021202020192018 and PriorRevolvingTotal
Non-owner occupied commercial real estate charge-offs— 52 — 29 399 147 — 627 
Real estate construction
Pass$283,519 $468,646 $176,604 $9,889 $11,048 $3,405 $6,486 $959,597 
Watch 629 33,220 9,418 72 — 65 — 43,404
Substandard— 8,522 — 107 — — 86 8,715
Real estate construction total$284,148 $510,388 $186,022 $10,068 $11,048 $3,470 $6,572 $1,011,716 
Real estate construction charge-offs284 — — 32 — — — 316 
Agricultural and agricultural real estate
Pass $152,665 $208,375 $114,798 $67,006 $28,247 $43,663 $260,941 $875,695 
Watch 2,245 16,257 293 622 70 349 427 20,263 
Substandard12 7,616 1,649 4 855 12,591 499 23,226 
Agricultural and agricultural real estate total$154,922 $232,248 $116,740 $67,632 $29,172 $56,603 $261,867 $919,184 
Agricultural and agricultural real estate charge-offs— — — 9 — 1 5,309 5,319 
Residential real estate
Pass$71,470 $177,564 $241,362 $73,029 $42,526 $155,899 $19,534 $781,384 
Watch 171 973 945 659 158 4,845 — 7,751
Substandard741 150 3,400 464 290 3,649 — 8,694
Residential real estate total$72,382 $178,687 $245,707 $74,152 $42,974 $164,393 $19,534 $797,829 
Residential real estate charge-offs— 59 124 — — — — 183 
Consumer
Pass$45,595 $62,900 $35,459 $7,731 $3,663 $6,109 $324,218 $485,675 
Watch730 84 694 21 41 644 2,060 4,274
Substandard80 308 401 75 159 1,769 465 3,257
Consumer total$46,405 $63,292 $36,554 $7,827 $3,863 $8,522 $326,743 $493,206 
Consumer charge-offs224615427191123,1173,677
Total pass$2,085,645 $2,901,425 $2,128,112 $773,698 $651,885 $1,012,958 $1,838,626 $11,392,349 
Total watch103,921 130,920 33,047 11,501 38,127 73,492 31,236 422,244
Total substandard57,951 40,695 11,792 17,706 30,467 61,931 33,510 254,052
Total loans $2,247,517 $3,073,040 $2,172,951 $802,905 $720,479 $1,148,381 $1,903,372 $12,068,645 
Total Charge-offs$531 $1,953 $958 $1,527 $981 $2,272 $11,392 $19,614 

As of December 31, 2022Amortized Cost Basis of Term Loans by Year of Origination
202220212020201920182017 and PriorRevolvingTotal
Commercial and industrial
Pass$967,103 $442,001 $260,021 $101,998 $57,776 $421,312 $1,064,333 $3,314,544 
Watch12,638 1,370 685 5,487 2,882 3,315 21,984 48,361 
Substandard6,691 14,366 9,369 22,171 5,546 6,758 36,608 101,509 
Commercial and industrial total$986,432 $457,737 $270,075 $129,656 $66,204 $431,385 $1,122,925 $3,464,414 
PPP
Pass$— $7,807 $526 $— $— $— $— $8,333 
Watch— 7 — — — — — 7 
Substandard— 2,685 — — — — — 2,685 
PPP total$— $10,499 $526 $— $— $— $— $11,025 
Owner occupied commercial real estate
As of December 31, 2022Amortized Cost Basis of Term Loans by Year of Origination
202220212020201920182017 and PriorRevolvingTotal
Pass$511,547 $781,946 $255,476 $266,228 $103,943 $179,503 $34,117 $2,132,760 
Watch22,079 3,410 12,346 8,520 3,645 11,899 — 61,899 
Substandard2,971 23,802 26,490 6,358 2,574 7,353 1,100 70,648 
Owner occupied commercial real estate total$536,597 $809,158 $294,312 $281,106 $110,162 $198,755 $35,217 $2,265,307 
Non-owner occupied commercial real estate
Pass$756,059 $515,075 $227,383 $261,964 $127,400 $210,289 $70,398 $2,168,568 
Watch8,131 792 2,849 38,218 38,510 16,180 547 105,227 
Substandard202 6,784 1,838 16,019 22,332 9,970 — 57,145 
Non-owner occupied commercial real estate total$764,392 $522,651 $232,070 $316,201 $188,242 $236,439 $70,945 $2,330,940 
Real estate construction
Pass$597,370 $328,391 $88,660 $21,221 $2,568 $6,274 $8,252 $1,052,736 
Watch665 16,218 1,257 — — 122 — 18,262
Substandard2,587 356 173 446 1,478 44 — 5,084
Real estate construction total$600,622 $344,965 $90,090 $21,667 $4,046 $6,440 $8,252 $1,076,082 
Agricultural and agricultural real estate
Pass$324,791 $140,252 $79,307 $34,447 $22,600 $38,672 $239,686 $879,755 
Watch3,795 515 3,865 641 444 672 902 10,834 
Substandard8,674 3,224 204 1,859 12,323 2,682 955 29,921 
Agricultural and agricultural real estate total$337,260 $143,991 $83,376 $36,947 $35,367 $42,026 $241,543 $920,510 
Residential real estate
Pass$189,133 $268,561 $64,627 $39,468 $34,863 $217,489 $23,331 $837,472 
Watch706 1,095 88 957 2,296 2,237 399 7,778
Substandard28 1,273 1,024 99 792 4,895 — 8,111
Residential real estate total$189,867 $270,929 $65,739 $40,524 $37,951 $224,621 $23,730 $853,361 
Consumer
Pass$80,592 $47,787 $11,722 $6,022 $4,840 $24,655 $325,247 $500,865 
Watch20 191 35 119 74 1,584 953 2,976
Substandard188 331 242 303 75 1,539 194 2,872
Consumer total$80,800 $48,309 $11,999 $6,444 $4,989 $27,778 $326,394 $506,713 
Total pass$3,426,595 $2,531,820 $987,722 $731,348 $353,990 $1,098,194 $1,765,364 $10,895,033 
Total watch48,034 23,598 21,125 53,942 47,851 36,009 24,785 255,344
Total substandard21,341 52,821 39,340 47,255 45,120 33,241 38,857 277,975
Total loans$3,495,970 $2,608,239 $1,048,187 $832,545 $446,961 $1,167,444 $1,829,006 $11,428,352