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Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 12,506,121 $ 12,358,017  
Unearned income (5,596) (6,787)  
Loans held for investment, net of unearned income 12,500,525 12,351,230 $ 11,766,425
Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income (5,596) (6,787)  
Loans held for investment, net of unearned income 12,426,751 12,282,414  
Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 73,774 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 59,632 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 14,609 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 451 554  
90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 27,313 25,530  
Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income (5,596) (6,787)  
Loans held for investment, net of unearned income 12,366,668 12,227,829  
Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment, net of unearned income 31,852 24,608  
Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,869,408 1,871,821  
Loans held for investment, net of unearned income 1,869,408   1,740,778
Commercial, financial, agricultural | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,863,047 1,866,022  
Commercial, financial, agricultural | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 6,361 5,799  
Commercial, financial, agricultural | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,276 1,098  
Commercial, financial, agricultural | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 195 1,310  
Commercial, financial, agricultural | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 227 483  
Commercial, financial, agricultural | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,200 1,296  
Commercial, financial, agricultural | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,859,544 1,864,441  
Commercial, financial, agricultural | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,966 3,193  
Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 113,070 122,807  
Loans held for investment, net of unearned income 107,474   121,146
Lease financing | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 113,070 122,807  
Lease financing | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 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 0 0  
Lease financing | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 113,070 122,120  
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 1,243,535 1,333,397  
Loans held for investment, net of unearned income 1,243,535   1,424,352
Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,243,535 1,333,397  
Real estate – construction: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real estate – construction: | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 225 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 0 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 1,243,310 1,333,397  
Real estate – construction: | 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 3,429,286 3,439,919  
Loans held for investment, net of unearned income 3,429,286   3,278,980
Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,374,117 3,390,697  
Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 55,169 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 42,805 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 14,373 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 219 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 25,701 22,067  
Real estate – 1-4 family mortgage: | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,331,093 3,353,741  
Real estate – 1-4 family mortgage: | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 15,095 16,671  
Real estate – 1-4 family mortgage: | Primary      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,404,521 2,422,482  
Real estate – 1-4 family mortgage: | Primary | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,354,607 2,378,308  
Real estate – 1-4 family mortgage: | Primary | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 49,914 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 38,827 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 13,360 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 219 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 22,688 19,394  
Real estate – 1-4 family mortgage: | Primary | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,315,561 2,344,629  
Real estate – 1-4 family mortgage: | Primary | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 13,866 15,326  
Real estate – 1-4 family mortgage: | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 525,346 522,688  
Real estate – 1-4 family mortgage: | Home equity | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 522,439 519,839  
Real estate – 1-4 family mortgage: | Home equity | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,907 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 3,829 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 697 987  
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 1,050 868  
Real estate – 1-4 family mortgage: | Home equity | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 518,610 516,835  
Real estate – 1-4 family mortgage: | Home equity | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,160 994  
Real estate – 1-4 family mortgage: | Rental/investment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 387,556 373,755  
Real estate – 1-4 family mortgage: | Rental/investment | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 385,385 371,575  
Real estate – 1-4 family mortgage: | Rental/investment | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,171 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 124 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 316 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 0 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 1,786 1,786  
Real estate – 1-4 family mortgage: | Rental/investment | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 385,261 371,508  
Real estate – 1-4 family mortgage: | Rental/investment | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 69 351  
Real estate – 1-4 family mortgage: | Land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 111,863 120,994  
Real estate – 1-4 family mortgage: | Land development | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 111,686 120,975  
Real estate – 1-4 family mortgage: | Land development | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 177 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 25 206  
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 0 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 177 19  
Real estate – 1-4 family mortgage: | Land development | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 111,661 120,769  
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 5,753,230 5,486,550  
Loans held for investment, net of unearned income 5,753,230   5,085,813
Real Estate - Commercial Mortgage | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,741,385 5,473,103  
Real Estate - Commercial Mortgage | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 11,845 13,447  
Real Estate - Commercial Mortgage | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 12,401 14,118  
Real Estate - Commercial Mortgage | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2 6,871  
Real Estate - Commercial Mortgage | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Real Estate - Commercial Mortgage | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 320 2,163  
Real Estate - Commercial Mortgage | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,728,984 5,458,985  
Real Estate - Commercial Mortgage | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 11,523 4,413  
Real Estate - Commercial Mortgage | Land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 103,438 104,415  
Real Estate - Commercial Mortgage | Land development | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 103,243 104,115  
Real Estate - Commercial Mortgage | Land development | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 195 300  
Real Estate - Commercial Mortgage | Land development | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,388 90  
Real Estate - Commercial Mortgage | Land development | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2 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 89 259  
Real Estate - Commercial Mortgage | Land development | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 99,855 104,025  
Real Estate - Commercial Mortgage | Land development | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 104 41  
Real Estate - Commercial Mortgage | Owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,678,911 1,648,961  
Real Estate - Commercial Mortgage | Owner-occupied | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,676,742 1,645,588  
Real Estate - Commercial Mortgage | Owner-occupied | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,169 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 5,965 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 0 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 231 1,904  
Real Estate - Commercial Mortgage | Owner-occupied | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,670,777 1,640,721  
Real Estate - Commercial Mortgage | Owner-occupied | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,938 1,338  
Real Estate - Commercial Mortgage | Non-owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,970,881 3,733,174  
Real Estate - Commercial Mortgage | Non-owner occupied | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,961,400 3,723,400  
Real Estate - Commercial Mortgage | Non-owner occupied | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 9,481 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 3,048 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 0 0  
Real Estate - Commercial Mortgage | Non-owner occupied | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,958,352 3,714,239  
Real Estate - Commercial Mortgage | Non-owner occupied | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 9,481 3,034  
Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 97,592 103,523  
Loans held for investment, net of unearned income 97,592   $ 115,356
Installment loans to individuals | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 97,193 103,175  
Installment loans to individuals | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 399 348  
Installment loans to individuals | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 925 1,230  
Installment loans to individuals | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 39 13  
Installment loans to individuals | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5 13  
Installment loans to individuals | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 92 4  
Installment loans to individuals | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 96,263 101,932  
Installment loans to individuals | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 268 331  
Residential | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 271,966 269,616  
Residential | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 271,966 269,616  
Residential | Real estate – construction: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Residential | Real estate – construction: | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 225 0  
Residential | Real estate – construction: | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Residential | Real estate – construction: | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Residential | Real estate – construction: | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Residential | Real estate – construction: | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 271,741 269,616  
Residential | Real estate – construction: | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Commercial | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 971,569 1,063,781  
Commercial | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 971,569 1,063,781  
Commercial | Real estate – construction: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Commercial | Real estate – construction: | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Commercial | Real estate – construction: | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Commercial | Real estate – construction: | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Commercial | Real estate – construction: | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Commercial | Real estate – construction: | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 971,569 1,063,781  
Commercial | Real estate – construction: | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 0 $ 0