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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