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Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 12,632,494 $ 12,358,017  
Unearned income (4,846) (6,787)  
Loans held for investment, net of unearned income 12,627,648 12,351,230 $ 12,168,023
Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income (4,846) (6,787)  
Loans held for investment, net of unearned income 12,513,776 12,282,414  
Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 113,872 68,816  
30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 17,523 54,031  
30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 8,685 18,678  
90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 5,351 554  
90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 32,750 25,530  
Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income (4,846) (6,787)  
Loans held for investment, net of unearned income 12,490,902 12,227,829  
Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 72,437 24,608  
Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,804,961 1,871,821  
Loans held for investment, net of unearned income 1,804,961   1,819,891
Commercial, financial, agricultural | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,800,246 1,866,022  
Commercial, financial, agricultural | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,715 5,799  
Commercial, financial, agricultural | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 333 1,098  
Commercial, financial, agricultural | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 120 1,310  
Commercial, financial, agricultural | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 309 483  
Commercial, financial, agricultural | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 720 1,296  
Commercial, financial, agricultural | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,799,604 1,864,441  
Commercial, financial, agricultural | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,875 3,193  
Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 103,005 122,807  
Loans held for investment, net of unearned income 98,159   120,724
Lease financing | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 102,391 122,807  
Lease financing | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 614 0  
Lease financing | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 687  
Lease financing | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Lease financing | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Lease financing | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 614 0  
Lease financing | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 102,391 122,120  
Lease financing | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,198,838 1,333,397  
Loans held for investment, net of unearned income 1,198,838   1,407,364
Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,198,699 1,333,397  
Real estate – construction: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 139 0  
Real estate – construction: | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 653 0  
Real estate – construction: | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,168 0  
Real estate – construction: | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,196,878 1,333,397  
Real estate – construction: | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 139 0  
Real estate – construction: | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 258,356 269,616  
Real estate – construction: | Residential | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 258,217 269,616  
Real estate – construction: | Residential | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 139 0  
Real estate – construction: | Residential | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 653 0  
Real estate – construction: | Residential | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Residential | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,168 0  
Real estate – construction: | Residential | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Residential | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 256,396 269,616  
Real estate – construction: | Residential | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 139 0  
Real estate – construction: | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 940,482 1,063,781  
Real estate – construction: | Commercial | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 940,482 1,063,781  
Real estate – construction: | Commercial | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Commercial | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Commercial | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Commercial | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Commercial | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | Commercial | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 940,482 1,063,781  
Real estate – construction: | Commercial | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,440,038 3,439,919  
Loans held for investment, net of unearned income 3,440,038   3,398,876
Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,380,734 3,390,697  
Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 59,304 49,222  
Real estate – 1-4 family mortgage: | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 12,631 36,898  
Real estate – 1-4 family mortgage: | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 8,513 10,484  
Real estate – 1-4 family mortgage: | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 17 58  
Real estate – 1-4 family mortgage: | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 29,447 22,067  
Real estate – 1-4 family mortgage: | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,368,086 3,353,741  
Real estate – 1-4 family mortgage: | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 21,344 16,671  
Real estate – 1-4 family mortgage: | Primary      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,409,912 2,422,482  
Real estate – 1-4 family mortgage: | Primary | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,354,836 2,378,308  
Real estate – 1-4 family mortgage: | Primary | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 55,076 44,174  
Real estate – 1-4 family mortgage: | Primary | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 8,902 33,679  
Real estate – 1-4 family mortgage: | Primary | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 7,742 9,454  
Real estate – 1-4 family mortgage: | Primary | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – 1-4 family mortgage: | Primary | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 27,460 19,394  
Real estate – 1-4 family mortgage: | Primary | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,345,934 2,344,629  
Real estate – 1-4 family mortgage: | Primary | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 19,874 15,326  
Real estate – 1-4 family mortgage: | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 537,372 522,688  
Real estate – 1-4 family mortgage: | Home equity | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 534,076 519,839  
Real estate – 1-4 family mortgage: | Home equity | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,296 2,849  
Real estate – 1-4 family mortgage: | Home equity | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,414 3,004  
Real estate – 1-4 family mortgage: | Home equity | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 731 987  
Real estate – 1-4 family mortgage: | Home equity | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – 1-4 family mortgage: | Home equity | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,235 868  
Real estate – 1-4 family mortgage: | Home equity | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 530,662 516,835  
Real estate – 1-4 family mortgage: | Home equity | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,330 994  
Real estate – 1-4 family mortgage: | Rental/investment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 390,029 373,755  
Real estate – 1-4 family mortgage: | Rental/investment | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 389,119 371,575  
Real estate – 1-4 family mortgage: | Rental/investment | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 910 2,180  
Real estate – 1-4 family mortgage: | Rental/investment | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 315 9  
Real estate – 1-4 family mortgage: | Rental/investment | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 18 43  
Real estate – 1-4 family mortgage: | Rental/investment | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 17 58  
Real estate – 1-4 family mortgage: | Rental/investment | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 752 1,786  
Real estate – 1-4 family mortgage: | Rental/investment | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 388,787 371,508  
Real estate – 1-4 family mortgage: | Rental/investment | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 140 351  
Real estate – 1-4 family mortgage: | Land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 102,725 120,994  
Real estate – 1-4 family mortgage: | Land development | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 102,703 120,975  
Real estate – 1-4 family mortgage: | Land development | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 22 19  
Real estate – 1-4 family mortgage: | Land development | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 206  
Real estate – 1-4 family mortgage: | Land development | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 22 0  
Real estate – 1-4 family mortgage: | Land development | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – 1-4 family mortgage: | Land development | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 19  
Real estate – 1-4 family mortgage: | Land development | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 102,703 120,769  
Real estate – 1-4 family mortgage: | Land development | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real Estate - Commercial Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,995,152 5,486,550  
Loans held for investment, net of unearned income 5,995,152   5,313,166
Real Estate - Commercial Mortgage | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,946,251 5,473,103  
Real Estate - Commercial Mortgage | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 48,901 13,447  
Real Estate - Commercial Mortgage | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,195 14,118  
Real Estate - Commercial Mortgage | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 6,871  
Real Estate - Commercial Mortgage | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,822 0  
Real Estate - Commercial Mortgage | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,912 2,163  
Real Estate - Commercial Mortgage | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,939,234 5,458,985  
Real Estate - Commercial Mortgage | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 46,989 4,413  
Real Estate - Commercial Mortgage | Land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 103,695 104,415  
Real Estate - Commercial Mortgage | Land development | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 100,526 104,115  
Real Estate - Commercial Mortgage | Land development | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,169 300  
Real Estate - Commercial Mortgage | Land development | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 356 90  
Real Estate - Commercial Mortgage | Land development | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real Estate - Commercial Mortgage | Land development | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real Estate - Commercial Mortgage | Land development | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 15 259  
Real Estate - Commercial Mortgage | Land development | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 100,170 104,025  
Real Estate - Commercial Mortgage | Land development | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,154 41  
Real Estate - Commercial Mortgage | Owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,845,791 1,648,961  
Real Estate - Commercial Mortgage | Owner-occupied | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,840,003 1,645,588  
Real Estate - Commercial Mortgage | Owner-occupied | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,788 3,373  
Real Estate - Commercial Mortgage | Owner-occupied | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,397 4,867  
Real Estate - Commercial Mortgage | Owner-occupied | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 131  
Real Estate - Commercial Mortgage | Owner-occupied | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,822 0  
Real Estate - Commercial Mortgage | Owner-occupied | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 843 1,904  
Real Estate - Commercial Mortgage | Owner-occupied | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,833,784 1,640,721  
Real Estate - Commercial Mortgage | Owner-occupied | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,945 1,338  
Real Estate - Commercial Mortgage | Non-owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,045,666 3,733,174  
Real Estate - Commercial Mortgage | Non-owner occupied | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,005,722 3,723,400  
Real Estate - Commercial Mortgage | Non-owner occupied | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 39,944 9,774  
Real Estate - Commercial Mortgage | Non-owner occupied | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 442 9,161  
Real Estate - Commercial Mortgage | Non-owner occupied | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 6,740  
Real Estate - Commercial Mortgage | Non-owner occupied | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real Estate - Commercial Mortgage | Non-owner occupied | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,054 0  
Real Estate - Commercial Mortgage | Non-owner occupied | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,005,280 3,714,239  
Real Estate - Commercial Mortgage | Non-owner occupied | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 38,890 3,034  
Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 90,500 103,523  
Loans held for investment, net of unearned income 90,500   $ 108,002
Installment loans to individuals | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 90,301 103,175  
Installment loans to individuals | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 199 348  
Installment loans to individuals | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 711 1,230  
Installment loans to individuals | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 52 13  
Installment loans to individuals | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 35 13  
Installment loans to individuals | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 57 4  
Installment loans to individuals | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 89,555 101,932  
Installment loans to individuals | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 90 $ 331