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Segment Reporting, Reconciliation of Segment Revenues (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) Segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting [Abstract] |  |  |
Number of operating segments | Segment | 1 |  |
Interest income [Abstract] |  |  |
Interest and fees on loans, including loans held for sale | $ 274,619 | $ 230,844 | $ 169,885
Interest and dividends on securities [Abstract] |  |  |
Taxable | 24,953 | 27,263 | 21,695
Tax exempt | 2,553 | 2,678 | 2,998
Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock | 783 | 759 | 603
Interest on Federal Reserve Bank deposits | 10,101 | 6,831 | 2,439
Other, including interest on federal funds sold | 434 | 275 | 122
Total interest income | 313,443 | 268,650 | 197,742
Interest expense [Abstract] |  |  |
Interest on deposits | 112,516 | 81,167 | 24,068
Interest on repurchase agreements and federal funds purchased | 10,393 | 8,994 | 2,540
Interest on advances from Federal Home Loan Bank | 16 | 1,004 | 20
Interest on long-term debt | 4,523 | 4,375 | 2,012
Total interest expense | 127,448 | 95,540 | 28,640
Net interest income | 185,995 | 173,110 | 169,102
Provision for credit losses | 10,951 | 6,811 | 4,905
Net interest income after provision for credit losses | 175,044 | 166,299 | 164,197
Noninterest income [Abstract] |  |  |
Deposit related fees | 29,824 | 29,935 | 29,049
Gains on sales of loans, net | 294 | 395 | 1,525
Trust and wealth management income | 14,921 | 13,025 | 12,394
Loan related fees | 4,957 | 3,792 | 6,185
Bank owned life insurance | 5,236 | 3,517 | 2,708
Brokerage revenue | 2,272 | 1,473 | 1,846
Securities gains (losses) | 631 | 996 | (168)
Dividend and undistributed income from subsidiaries | 0 | 0 | 0
Other noninterest income | 4,430 | 4,526 | 4,377
Total noninterest income | 62,565 | 57,659 | 57,916
Noninterest expense [Abstract] |  |  |
Officer salaries and employee benefits | 16,316 | 15,206 | 15,922
Other salaries and employee benefits | 63,111 | 58,505 | 56,568
Occupancy, net | 9,442 | 8,900 | 8,380
Equipment | 2,762 | 2,943 | 2,703
Data processing | 11,172 | 9,726 | 8,910
Bank franchise tax | 1,685 | 1,649 | 1,528
Legal fees | 1,090 | 1,131 | 1,159
Professional fees | 2,783 | 2,219 | 2,275
Advertising and marketing | 3,130 | 3,214 | 3,005
FDIC insurance | 2,586 | 2,483 | 1,447
Other real estate owned provision and expense | 152 | 350 | 456
Repossession expense | 1,089 | 531 | 546
Other noninterest expense | 15,605 | 18,533 | 18,172
Total noninterest expense | 130,923 | 125,390 | 121,071
Income before income taxes | 106,686 | 98,568 | 101,042
Income taxes | 23,873 | 20,564 | 19,228
Net income | 82,813 | 78,004 | 81,814
Operating Segments [Member] | Community Banking Services [Member] |  |  |
Interest income [Abstract] |  |  |
Interest and fees on loans, including loans held for sale | 274,619 | 230,844 | 169,885
Interest and dividends on securities [Abstract] |  |  |
Taxable | 24,953 | 27,263 | 21,695
Tax exempt | 2,553 | 2,678 | 2,998
Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock | 783 | 759 | 603
Interest on Federal Reserve Bank deposits | 10,101 | 6,831 | 2,439
Other, including interest on federal funds sold | 301 | 146 | 60
Total interest income | 313,310 | 268,521 | 197,680
Interest expense [Abstract] |  |  |
Interest on deposits | 112,516 | 81,167 | 24,068
Interest on repurchase agreements and federal funds purchased | 10,393 | 8,994 | 2,540
Interest on advances from Federal Home Loan Bank | 16 | 1,004 | 20
Interest on long-term debt | 365 | 333 | 70
Total interest expense | 123,290 | 91,498 | 26,698
Net interest income | 190,020 | 177,023 | 170,982
Provision for credit losses | 10,951 | 6,811 | 4,905
Net interest income after provision for credit losses | 179,069 | 170,212 | 166,077
Noninterest income [Abstract] |  |  |
Deposit related fees | 29,824 | 29,935 | 29,049
Gains on sales of loans, net | 294 | 395 | 1,525
Trust and wealth management income | 14,921 | 13,025 | 12,394
Loan related fees | 4,957 | 3,792 | 6,185
Bank owned life insurance | 5,236 | 3,517 | 2,708
Brokerage revenue | 2,272 | 1,473 | 1,846
Securities gains (losses) | 631 | 996 | (168)
Dividend and undistributed income from subsidiaries | 0 | 0 | 0
Other noninterest income | 5,540 | 5,551 | 5,430
Total noninterest income | 63,675 | 58,684 | 58,969
Noninterest expense [Abstract] |  |  |
Officer salaries and employee benefits | 15,107 | 13,766 | 13,877
Other salaries and employee benefits | 63,111 | 58,505 | 56,568
Occupancy, net | 9,440 | 8,900 | 8,380
Equipment | 2,746 | 2,943 | 2,703
Data processing | 11,152 | 9,711 | 8,889
Bank franchise tax | 1,685 | 1,649 | 1,528
Legal fees | 906 | 1,008 | 1,044
Professional fees | 2,581 | 2,083 | 2,125
Advertising and marketing | 3,078 | 3,191 | 2,982
FDIC insurance | 2,586 | 2,483 | 1,447
Other real estate owned provision and expense | 152 | 350 | 456
Repossession expense | 1,089 | 531 | 546
Other noninterest expense | 14,666 | 17,852 | 17,381
Total noninterest expense | 128,299 | 122,972 | 117,926
Income before income taxes | 114,445 | 105,924 | 107,120
Income taxes | 26,267 | 22,576 | 21,036
Net income | 88,178 | 83,348 | 86,084
Operating Segments [Member] | Holding Company [Member] |  |  |
Interest income [Abstract] |  |  |
Interest and fees on loans, including loans held for sale | 0 | 0 | 0
Interest and dividends on securities [Abstract] |  |  |
Taxable | 0 | 0 | 0
Tax exempt | 0 | 0 | 0
Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock | 0 | 0 | 0
Interest on Federal Reserve Bank deposits | 0 | 0 | 0
Other, including interest on federal funds sold | 133 | 129 | 62
Total interest income | 133 | 129 | 62
Interest expense [Abstract] |  |  |
Interest on deposits | 0 | 0 | 0
Interest on repurchase agreements and federal funds purchased | 0 | 0 | 0
Interest on advances from Federal Home Loan Bank | 0 | 0 | 0
Interest on long-term debt | 4,410 | 4,286 | 2,060
Total interest expense | 4,410 | 4,286 | 2,060
Net interest income | (4,277) | (4,157) | (1,998)
Provision for credit losses | 0 | 0 | 0
Net interest income after provision for credit losses | (4,277) | (4,157) | (1,998)
Noninterest income [Abstract] |  |  |
Deposit related fees | 0 | 0 | 0
Gains on sales of loans, net | 0 | 0 | 0
Trust and wealth management income | 0 | 0 | 0
Loan related fees | 0 | 0 | 0
Bank owned life insurance | 0 | 0 | 0
Brokerage revenue | 0 | 0 | 0
Securities gains (losses) | 0 | 0 | 0
Dividend and undistributed income from subsidiaries | 88,430 | 83,593 | 86,202
Other noninterest income | 1,173 | 1,400 | 710
Total noninterest income | 89,603 | 84,993 | 86,912
Noninterest expense [Abstract] |  |  |
Officer salaries and employee benefits | 2,039 | 2,511 | 2,570
Other salaries and employee benefits | 873 | 826 | 801
Occupancy, net | 2 | 0 | 0
Equipment | 201 | 125 | 75
Data processing | 20 | 15 | 24
Bank franchise tax | 0 | 0 | 0
Legal fees | 184 | 123 | 115
Professional fees | 441 | 383 | 402
Advertising and marketing | 52 | 23 | 23
FDIC insurance | 0 | 0 | 0
Other real estate owned provision and expense | 0 | 0 | 0
Repossession expense | 0 | 0 | 0
Other noninterest expense | 1,095 | 838 | 898
Total noninterest expense | 4,907 | 4,844 | 4,908
Income before income taxes | 80,419 | 75,992 | 80,006
Income taxes | (2,394) | (2,012) | (1,808)
Net income | 82,813 | 78,004 | 81,814
Eliminations [Member] |  |  |
Interest income [Abstract] |  |  |
Interest and fees on loans, including loans held for sale | 0 | 0 | 0
Interest and dividends on securities [Abstract] |  |  |
Taxable | 0 | 0 | 0
Tax exempt | 0 | 0 | 0
Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock | 0 | 0 | 0
Interest on Federal Reserve Bank deposits | 0 | 0 | 0
Other, including interest on federal funds sold | 0 | 0 | 0
Total interest income | 0 | 0 | 0
Interest expense [Abstract] |  |  |
Interest on deposits | 0 | 0 | 0
Interest on repurchase agreements and federal funds purchased | 0 | 0 | 0
Interest on advances from Federal Home Loan Bank | 0 | 0 | 0
Interest on long-term debt | (252) | (244) | (118)
Total interest expense | (252) | (244) | (118)
Net interest income | 252 | 244 | 118
Provision for credit losses | 0 | 0 | 0
Net interest income after provision for credit losses | 252 | 244 | 118
Noninterest income [Abstract] |  |  |
Deposit related fees | 0 | 0 | 0
Gains on sales of loans, net | 0 | 0 | 0
Trust and wealth management income | 0 | 0 | 0
Loan related fees | 0 | 0 | 0
Bank owned life insurance | 0 | 0 | 0
Brokerage revenue | 0 | 0 | 0
Securities gains (losses) | 0 | 0 | 0
Dividend and undistributed income from subsidiaries | (88,430) | (83,593) | (86,202)
Other noninterest income | (2,283) | (2,425) | (1,763)
Total noninterest income | (90,713) | (86,018) | (87,965)
Noninterest expense [Abstract] |  |  |
Officer salaries and employee benefits | (830) | (1,071) | (525)
Other salaries and employee benefits | (873) | (826) | (801)
Occupancy, net | 0 | 0 | 0
Equipment | (185) | (125) | (75)
Data processing | 0 | 0 | (3)
Bank franchise tax | 0 | 0 | 0
Legal fees | 0 | 0 | 0
Professional fees | (239) | (247) | (252)
Advertising and marketing | 0 | 0 | 0
FDIC insurance | 0 | 0 | 0
Other real estate owned provision and expense | 0 | 0 | 0
Repossession expense | 0 | 0 | 0
Other noninterest expense | (156) | (157) | (107)
Total noninterest expense | (2,283) | (2,426) | (1,763)
Income before income taxes | (88,178) | (83,348) | (86,084)
Income taxes | 0 | 0 | 0
Net income | $ (88,178) | $ (83,348) | $ (86,084)

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