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Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Interest Income |  |  |  |  |
Interest and fees on loans | $ 61,325 | $ 58,410 | $ 178,628 | $ 170,239 |
Interest on securities | 6,427 | 7,906 | 19,802 | 24,661 |
Other investments | 1,538 | 2,018 | 3,882 | 4,898 |
Total Interest Income | 69,290 | 68,334 | 202,312 | 199,798 |
Interest Expense |  |  |  |  |
Deposits | 21,972 | 24,462 | 63,389 | 70,148 |
Other borrowings and subordinated debt and debentures | 1,957 | 2,018 | 5,262 | 6,253 |
Total Interest Expense | 23,929 | 26,480 | 68,651 | 76,401 |
Net Interest Income | 45,361 | 41,854 | 133,661 | 123,397 |
Provision for credit losses | 1,991 | 1,488 | 4,212 | 2,251 |
Net Interest Income After Provision for Credit Losses | 43,370 | 40,366 | 129,449 | 121,146 |
Non-interest Income |  |  |  |  |
Interchange income | 4,157 | 4,146 | 10,674 | 10,698 |
Service charges on deposit accounts | 3,131 | 3,085 | 8,926 | 8,894 |
Net gains on mortgage loans | 1,474 | 2,177 | 5,408 | 4,874 |
Mortgage loan servicing, net | 74 | (3,130) | (72) | 1,686 |
Other | 3,101 | 3,230 | 8,750 | 11,089 |
Total Non-interest Income | 11,937 | 9,508 | 33,686 | 37,241 |
Non-interest Expense |  |  |  |  |
Compensation and employee benefits | 21,125 | 20,048 | 62,631 | 62,069 |
Data processing | 3,784 | 3,379 | 11,360 | 9,891 |
Occupancy, net | 2,127 | 1,893 | 6,396 | 5,853 |
Interchange expense | 1,180 | 1,149 | 3,476 | 3,373 |
Furniture, fixtures and equipment | 892 | 932 | 2,570 | 2,834 |
Advertising | 526 | 581 | 2,220 | 1,860 |
FDIC deposit insurance | 615 | 664 | 1,963 | 2,141 |
Legal and professional | 682 | 687 | 1,661 | 1,717 |
Loan and collection | 618 | 657 | 2,148 | 1,868 |
Communications | 465 | 519 | 1,526 | 1,633 |
Other | 2,117 | 2,074 | 6,204 | 4,870 |
Total Non-interest Expense | 34,131 | 32,583 | 102,155 | 98,109 |
Income Before Income Tax | 21,176 | 17,291 | 60,980 | 60,278 |
Income tax expense | 3,674 | 3,481 | 11,011 | 11,949 |
Net Income | 17,502 | 13,810 | 49,969 | 48,329 |
OTHER SEGMENT DISCLOSURES |  |  |  |  |
Depreciation | 1,125 | 1,283 | 3,722 | 3,881 |
Amortization | 121 | 129 | 365 | 387 |
Total assets | 5,493,113 | 5,259,268 | 5,493,113 | 5,259,268 | $ 5,338,104
Operating Segments | Independent Bank |  |  |  |  |
Interest Income |  |  |  |  |
Interest and fees on loans | 61,254 | 58,345 | 178,419 | 170,050 |
Interest on securities | 6,427 | 7,906 | 19,802 | 24,661 |
Other investments | 1,538 | 2,018 | 3,882 | 4,898 |
Total Interest Income | 69,219 | 68,269 | 202,103 | 199,609 |
Interest Expense |  |  |  |  |
Deposits | 22,315 | 24,949 | 64,471 | 71,468 |
Other borrowings and subordinated debt and debentures | 139 | 552 | 585 | 1,856 |
Total Interest Expense | 22,454 | 25,501 | 65,056 | 73,324 |
Net Interest Income | 46,765 | 42,768 | 137,047 | 126,285 |
Provision for credit losses | 1,991 | 1,488 | 4,212 | 2,251 |
Net Interest Income After Provision for Credit Losses | 44,774 | 41,280 | 132,835 | 124,034 |
Non-interest Income |  |  |  |  |
Interchange income | 4,157 | 4,146 | 10,674 | 10,698 |
Service charges on deposit accounts | 3,131 | 3,085 | 8,926 | 8,894 |
Net gains on mortgage loans | 1,425 | 2,125 | 5,231 | 4,750 |
Mortgage loan servicing, net | 74 | (3,130) | (72) | 1,686 |
Other | 3,010 | 3,142 | 8,429 | 10,809 |
Total Non-interest Income | 11,797 | 9,368 | 33,188 | 36,837 |
Non-interest Expense |  |  |  |  |
Compensation and employee benefits | 21,016 | 19,951 | 62,329 | 61,795 |
Data processing | 3,764 | 3,360 | 11,302 | 9,836 |
Occupancy, net | 2,121 | 1,887 | 6,378 | 5,835 |
Interchange expense | 1,180 | 1,149 | 3,476 | 3,373 |
Furniture, fixtures and equipment | 891 | 931 | 2,568 | 2,831 |
Advertising | 523 | 580 | 2,213 | 1,854 |
FDIC deposit insurance | 615 | 664 | 1,963 | 2,141 |
Legal and professional | 546 | 607 | 1,325 | 1,417 |
Loan and collection | 618 | 657 | 2,148 | 1,868 |
Communications | 460 | 514 | 1,507 | 1,617 |
Other | 1,915 | 1,888 | 5,609 | 4,306 |
Total Non-interest Expense | 33,649 | 32,188 | 100,818 | 96,873 |
Income Before Income Tax | 22,922 | 18,460 | 65,205 | 63,998 |
Income tax expense | 4,122 | 3,725 | 12,232 | 12,765 |
Net Income | 18,800 | 14,735 | 52,973 | 51,233 |
OTHER SEGMENT DISCLOSURES |  |  |  |  |
Depreciation | 1,125 | 1,283 | 3,721 | 3,879 |
Amortization | 121 | 129 | 365 | 387 |
Total assets | 5,486,851 | 5,254,269 | 5,486,851 | 5,254,269 |
Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |  |
Interest Income |  |  |  |  |
Interest and fees on loans | 0 | 0 | 0 | 0 |
Interest on securities | 0 | 0 | 0 | 0 |
Other investments | 343 | 487 | 1,082 | 1,320 |
Total Interest Income | 343 | 487 | 1,082 | 1,320 |
Interest Expense |  |  |  |  |
Deposits | 0 | 0 | 0 | 0 |
Other borrowings and subordinated debt and debentures | 1,818 | 1,466 | 4,677 | 4,397 |
Total Interest Expense | 1,818 | 1,466 | 4,677 | 4,397 |
Net Interest Income | (1,475) | (979) | (3,595) | (3,077) |
Provision for credit losses | 0 | 0 | 0 | 0 |
Net Interest Income After Provision for Credit Losses | (1,475) | (979) | (3,595) | (3,077) |
Non-interest Income |  |  |  |  |
Interchange income | 0 | 0 | 0 | 0 |
Service charges on deposit accounts | 0 | 0 | 0 | 0 |
Net gains on mortgage loans | 0 | 0 | 0 | 0 |
Mortgage loan servicing, net | 0 | 0 | 0 | 0 |
Other | 310 | 275 | 938 | 754 |
Total Non-interest Income | 310 | 275 | 938 | 754 |
Non-interest Expense |  |  |  |  |
Compensation and employee benefits | 144 | 129 | 409 | 356 |
Data processing | 20 | 19 | 58 | 55 |
Occupancy, net | 6 | 6 | 18 | 18 |
Interchange expense | 0 | 0 | 0 | 0 |
Furniture, fixtures and equipment | 1 | 1 | 2 | 3 |
Advertising | 3 | 1 | 7 | 6 |
FDIC deposit insurance | 0 | 0 | 0 | 0 |
Legal and professional | 136 | 80 | 336 | 300 |
Loan and collection | 0 | 0 | 0 | 0 |
Communications | 5 | 5 | 19 | 16 |
Other | 202 | 186 | 595 | 564 |
Total Non-interest Expense | 517 | 427 | 1,444 | 1,318 |
Income Before Income Tax | (1,682) | (1,131) | (4,101) | (3,641) |
Income tax expense | (435) | (237) | (1,195) | (800) |
Net Income | (1,247) | (894) | (2,906) | (2,841) |
OTHER SEGMENT DISCLOSURES |  |  |  |  |
Depreciation | 0 | 0 | 1 | 2 |
Amortization | 0 | 0 | 0 | 0 |
Total assets | 538,943 | 541,422 | 538,943 | 541,422 |
Eliminations |  |  |  |  |
Interest Income |  |  |  |  |
Interest and fees on loans | 71 | 65 | 209 | 189 |
Interest on securities | 0 | 0 | 0 | 0 |
Other investments | (343) | (487) | (1,082) | (1,320) |
Total Interest Income | (272) | (422) | (873) | (1,131) |
Interest Expense |  |  |  |  |
Deposits | (343) | (487) | (1,082) | (1,320) |
Other borrowings and subordinated debt and debentures | 0 | 0 | 0 | 0 |
Total Interest Expense | (343) | (487) | (1,082) | (1,320) |
Net Interest Income | 71 | 65 | 209 | 189 |
Provision for credit losses | 0 | 0 | 0 | 0 |
Net Interest Income After Provision for Credit Losses | 71 | 65 | 209 | 189 |
Non-interest Income |  |  |  |  |
Interchange income | 0 | 0 | 0 | 0 |
Service charges on deposit accounts | 0 | 0 | 0 | 0 |
Net gains on mortgage loans | 49 | 52 | 177 | 124 |
Mortgage loan servicing, net | 0 | 0 | 0 | 0 |
Other | (219) | (187) | (617) | (474) |
Total Non-interest Income | (170) | (135) | (440) | (350) |
Non-interest Expense |  |  |  |  |
Compensation and employee benefits | (35) | (32) | (107) | (82) |
Data processing | 0 | 0 | 0 | 0 |
Occupancy, net | 0 | 0 | 0 | 0 |
Interchange expense | 0 | 0 | 0 | 0 |
Furniture, fixtures and equipment | 0 | 0 | 0 | 0 |
Advertising | 0 | 0 | 0 | 0 |
FDIC deposit insurance | 0 | 0 | 0 | 0 |
Legal and professional | 0 | 0 | 0 | 0 |
Loan and collection | 0 | 0 | 0 | 0 |
Communications | 0 | 0 | 0 | 0 |
Other | 0 | 0 | 0 | 0 |
Total Non-interest Expense | (35) | (32) | (107) | (82) |
Income Before Income Tax | (64) | (38) | (124) | (79) |
Income tax expense | (13) | (7) | (26) | (16) |
Net Income | (51) | (31) | (98) | (63) |
OTHER SEGMENT DISCLOSURES |  |  |  |  |
Depreciation | 0 | 0 | 0 | 0 |
Amortization | 0 | 0 | 0 | 0 |
Total assets | $ (532,681) | $ (536,423) | $ (532,681) | $ (536,423) |

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