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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 USD ($) Segment | Sep. 30, 2024 Segment | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) Segment | Dec. 31, 2022 USD ($) Segment
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | Segment | 2 | 1 |  | 1 | 1
Financial Information of Reportable Segments [Abstract] |  |  |  |  |
Net interest income |  |  | $ 400,122 | $ 378,219 | $ 362,190
Provision for loan losses |  |  | 19,607 | 25,274 | 17,147
Net interest income after provision for loan losses |  |  | 380,515 | 352,945 | 345,043
Noninterest income [Abstract] |  |  |  |  |
Service charges on deposit accounts |  |  | 17,087 | 15,425 | 14,630
Card services income |  |  | 22,331 | 20,829 | 29,058
Retirement plan administration fees |  |  | 56,587 | 47,221 | 48,112
Wealth management |  |  | 41,641 | 34,763 | 33,311
Insurance services |  |  | 17,032 | 15,667 | 14,696
Bank owned life insurance income |  |  | 8,325 | 6,750 | 6,044
Net securities gains (losses) |  |  | 2,789 | (9,315) | (1,131)
Other |  |  | 11,032 | 10,838 | 10,858
Total noninterest income |  |  | 176,824 | 142,178 | 155,578
Noninterest expense [Abstract] |  |  |  |  |
Salaries and employee benefits |  |  | 232,487 | 194,250 | 187,830
Technology and data services |  |  | 39,139 | 38,163 | 35,712
Occupancy |  |  | 31,309 | 28,408 | 26,282
Professional fees and outside services |  |  | 19,132 | 17,601 | 16,810
Office supplies and postage |  |  | 7,525 | 6,917 | 6,140
FDIC assessment |  |  | 6,765 | 6,257 | 3,197
Advertising |  |  | 3,386 | 3,054 | 2,822
Amortization of intangible assets |  |  | 8,443 | 4,734 | 2,263
Loan collection and other real estate owned, net |  |  | 2,505 | 2,618 | 2,647
Acquisition expenses |  |  | 1,531 | 9,978 | 967
Other |  |  | 25,659 | 29,684 | 19,795
Total noninterest expense |  |  | 377,881 | 341,664 | 304,465
Income before income tax expense |  |  | 179,458 | 153,459 | 196,156
Income tax expense |  |  | 38,817 | 34,677 | 44,161
Net income |  |  | 140,641 | 118,782 | 151,995
Goodwill | $ 362,663 |  | 362,663 | 361,851 | 281,204
Intangible assets, net | 36,360 |  | 36,360 | 40,443 | 7,341
Total assets | 13,786,666 |  | $ 13,786,666 | 13,309,040 | 11,739,296
Segment reporting, other segment item, composition, description |  |  | Included in All Other is the revenue and expenses from certain other non-bank subsidiaries of the parent, including the insurance subsidiary, along with eliminating amounts that do not meet the definition of an operating segment. |  |
All Other [Member] |  |  |  |  |
Financial Information of Reportable Segments [Abstract] |  |  |  |  |
Net interest income |  |  | $ 0 | 0 | 0
Provision for loan losses |  |  | 0 | 0 | 0
Net interest income after provision for loan losses |  |  | 0 | 0 | 0
Noninterest income [Abstract] |  |  |  |  |
Service charges on deposit accounts |  |  | 0 | 0 | 0
Card services income |  |  | 0 | 0 | 0
Retirement plan administration fees |  |  | (1,512) | (1,358) | (1,179)
Wealth management |  |  | 47 | 41 | 44
Insurance services |  |  | 17,031 | 15,665 | 14,694
Bank owned life insurance income |  |  | 0 | 0 | 0
Net securities gains (losses) |  |  | 0 | 0 | 0
Other |  |  | (8,586) | (9,701) | (4,386)
Total noninterest income |  |  | 6,980 | 4,647 | 9,173
Noninterest expense [Abstract] |  |  |  |  |
Salaries and employee benefits |  |  | 10,925 | 9,901 | 9,439
Technology and data services |  |  | 662 | 600 | 476
Occupancy |  |  | 257 | 263 | 255
Professional fees and outside services |  |  | (1,305) | (1,177) | (1,031)
Office supplies and postage |  |  | 68 | 85 | 69
FDIC assessment |  |  | 0 | 0 | 0
Advertising |  |  | 22 | 113 | 131
Amortization of intangible assets |  |  | 153 | 78 | 63
Loan collection and other real estate owned, net |  |  | 0 | 0 | 0
Acquisition expenses |  |  | 0 | 0 | 0
Other |  |  | (8,073) | (9,122) | (3,944)
Total noninterest expense |  |  | 2,709 | 741 | 5,458
Income before income tax expense |  |  | 4,271 | 3,906 | 3,715
Income tax expense |  |  | 407 | 574 | 488
Net income |  |  | 3,864 | 3,332 | 3,227
Goodwill | 14,536 |  | 14,536 | 14,377 | 14,377
Intangible assets, net | 1,274 |  | 1,274 | 357 | 285
Total assets | (1,742,035) |  | (1,742,035) | (1,633,413) | (1,374,126)
Operating Segments [Member] | Banking [Member] |  |  |  |  |
Financial Information of Reportable Segments [Abstract] |  |  |  |  |
Net interest income |  |  | 400,048 | 378,165 | 362,179
Provision for loan losses |  |  | 19,607 | 25,274 | 17,147
Net interest income after provision for loan losses |  |  | 380,441 | 352,891 | 345,032
Noninterest income [Abstract] |  |  |  |  |
Service charges on deposit accounts |  |  | 17,087 | 15,425 | 14,630
Card services income |  |  | 22,331 | 20,829 | 29,058
Retirement plan administration fees |  |  | 0 | 0 | 0
Wealth management |  |  | 39,502 | 32,770 | 31,309
Insurance services |  |  | 1 | 2 | 2
Bank owned life insurance income |  |  | 8,325 | 6,750 | 6,044
Net securities gains (losses) |  |  | 2,789 | (9,315) | (1,131)
Other |  |  | 19,091 | 19,882 | 14,753
Total noninterest income |  |  | 109,126 | 86,343 | 94,665
Noninterest expense [Abstract] |  |  |  |  |
Salaries and employee benefits |  |  | 188,157 | 154,972 | 151,521
Technology and data services |  |  | 37,365 | 36,428 | 34,024
Occupancy |  |  | 29,985 | 27,097 | 25,068
Professional fees and outside services |  |  | 18,611 | 16,879 | 16,047
Office supplies and postage |  |  | 7,020 | 6,460 | 5,716
FDIC assessment |  |  | 6,765 | 6,257 | 3,197
Advertising |  |  | 3,312 | 2,903 | 2,657
Amortization of intangible assets |  |  | 6,419 | 3,053 | 583
Loan collection and other real estate owned, net |  |  | 2,505 | 2,618 | 2,647
Acquisition expenses |  |  | 1,531 | 9,978 | 967
Other |  |  | 32,594 | 37,801 | 22,681
Total noninterest expense |  |  | 334,264 | 304,446 | 265,108
Income before income tax expense |  |  | 155,303 | 134,788 | 174,589
Income tax expense |  |  | 34,117 | 31,038 | 40,054
Net income |  |  | 121,186 | 103,750 | 134,535
Goodwill | 324,250 |  | 324,250 | 324,250 | 244,509
Intangible assets, net | 27,553 |  | 27,553 | 33,972 | 1,183
Total assets | 15,475,117 |  | 15,475,117 | 14,905,900 | 13,067,505
Operating Segments [Member] | Retirement Plan Administration [Member] |  |  |  |  |
Financial Information of Reportable Segments [Abstract] |  |  |  |  |
Net interest income |  |  | 74 | 54 | 11
Provision for loan losses |  |  | 0 | 0 | 0
Net interest income after provision for loan losses |  |  | 74 | 54 | 11
Noninterest income [Abstract] |  |  |  |  |
Service charges on deposit accounts |  |  | 0 | 0 | 0
Card services income |  |  | 0 | 0 | 0
Retirement plan administration fees |  |  | 58,099 | 48,579 | 49,291
Wealth management |  |  | 2,092 | 1,952 | 1,958
Insurance services |  |  | 0 | 0 | 0
Bank owned life insurance income |  |  | 0 | 0 | 0
Net securities gains (losses) |  |  | 0 | 0 | 0
Other |  |  | 527 | 657 | 491
Total noninterest income |  |  | 60,718 | 51,188 | 51,740
Noninterest expense [Abstract] |  |  |  |  |
Salaries and employee benefits |  |  | 33,405 | 29,377 | 26,870
Technology and data services |  |  | 1,112 | 1,135 | 1,212
Occupancy |  |  | 1,067 | 1,048 | 959
Professional fees and outside services |  |  | 1,826 | 1,899 | 1,794
Office supplies and postage |  |  | 437 | 372 | 355
FDIC assessment |  |  | 0 | 0 | 0
Advertising |  |  | 52 | 38 | 34
Amortization of intangible assets |  |  | 1,871 | 1,603 | 1,617
Loan collection and other real estate owned, net |  |  | 0 | 0 | 0
Acquisition expenses |  |  | 0 | 0 | 0
Other |  |  | 1,138 | 1,005 | 1,058
Total noninterest expense |  |  | 40,908 | 36,477 | 33,899
Income before income tax expense |  |  | 19,884 | 14,765 | 17,852
Income tax expense |  |  | 4,293 | 3,065 | 3,619
Net income |  |  | 15,591 | 11,700 | 14,233
Goodwill | 23,877 |  | 23,877 | 23,224 | 22,318
Intangible assets, net | 7,533 |  | 7,533 | 6,114 | 5,873
Total assets | $ 53,584 |  | $ 53,584 | $ 36,553 | $ 45,917

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