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Non Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 10,318,571 $ 10,024,981  
Unearned income (5,112) (4,067)  
Loans, net of unearned income 10,313,459 10,020,914 $ 10,688,408
Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,445,607 1,423,270  
Loans, net of unearned income 1,445,607   2,249,287
Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 94,954 80,192  
Loans, net of unearned income 89,842   75,256
Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,222,052 1,104,896  
Loans, net of unearned income 1,222,052   955,918
Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,840,979 2,724,246  
Loans, net of unearned income 2,840,979   2,686,061
Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,577,864 4,549,037  
Loans, net of unearned income 4,577,864   4,549,027
Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 137,115 143,340  
Loans, net of unearned income 137,115   $ 172,859
Residential | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 306,655 302,275  
Commercial | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 915,397 802,621  
Primary | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,925,813 1,816,120  
Home equity | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 470,665 474,604  
Rental/investment | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 292,811 288,474  
Owner-occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,538,693 1,563,351  
Non-owner occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,907,116 2,856,947  
Non purchased loans and leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 9,344,002 9,015,078  
Unearned income (5,112) (4,067)  
Loans, net of unearned income 9,338,890 9,011,011  
Non purchased loans and leases | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,336,239 1,332,962  
Non purchased loans and leases | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 94,954 80,192  
Non purchased loans and leases | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,216,928 1,099,902  
Non purchased loans and leases | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,644,587 2,508,473  
Non purchased loans and leases | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,945,540 3,885,984  
Non purchased loans and leases | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 105,754 107,565  
Non purchased loans and leases | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income (5,112) (4,067)  
Loans, net of unearned income 9,306,317 8,980,260  
Non purchased loans and leases | Accruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,331,278 1,327,202  
Non purchased loans and leases | Accruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 94,954 80,181  
Non purchased loans and leases | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,216,928 1,099,902  
Non purchased loans and leases | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,626,809 2,492,289  
Non purchased loans and leases | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,935,973 3,877,445  
Non purchased loans and leases | Accruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 105,487 107,308  
Non purchased loans and leases | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income   0  
Loans, net of unearned income 32,573 30,751  
Non purchased loans and leases | Nonaccruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,961 5,760  
Non purchased loans and leases | Nonaccruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 11  
Non purchased loans and leases | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 17,778 16,184  
Non purchased loans and leases | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 9,567 8,539  
Non purchased loans and leases | Nonaccruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 267 257  
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 27,230 23,921  
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,519 3,325  
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,857 1,077  
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 19,699 17,085  
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,481 1,456  
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 674 978  
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 7,639 3,964  
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 739 1,669  
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,088 2,102  
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,809 163  
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3 30  
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 209 1,074  
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 77 103  
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 132 834  
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 125  
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 12  
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 12,590 13,462  
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,875 2,665  
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 11  
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 8,595 9,577  
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,100 1,114  
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 20 95  
Non purchased loans and leases | Current Loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unearned income (5,112) (4,067)  
Loans, net of unearned income 9,278,878 8,955,265  
Non purchased loans and leases | Current Loans | Accruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,329,682 1,323,774  
Non purchased loans and leases | Current Loans | Accruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 94,954 80,181  
Non purchased loans and leases | Current Loans | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,215,071 1,098,825  
Non purchased loans and leases | Current Loans | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,606,978 2,474,370  
Non purchased loans and leases | Current Loans | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,932,492 3,875,864  
Non purchased loans and leases | Current Loans | Accruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 104,813 106,318  
Non purchased loans and leases | Current Loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 12,344 13,325  
Non purchased loans and leases | Current Loans | Nonaccruing Loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,347 1,426  
Non purchased loans and leases | Current Loans | Nonaccruing Loans | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Current Loans | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Current Loans | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,095 4,505  
Non purchased loans and leases | Current Loans | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,658 7,262  
Non purchased loans and leases | Current Loans | Nonaccruing Loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 244 132  
Non purchased loans and leases | Residential | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 305,396 300,988  
Non purchased loans and leases | Residential | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 305,396 300,988  
Non purchased loans and leases | Residential | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Residential | 30-89 Days Past Due | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,857 1,077  
Non purchased loans and leases | Residential | 30-89 Days Past Due | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Residential | 90 Days or More Past Due | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Residential | 90 Days or More Past Due | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Residential | Current Loans | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 303,539 299,911  
Non purchased loans and leases | Residential | Current Loans | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Commercial | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 911,532 798,914  
Non purchased loans and leases | Commercial | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 911,532 798,914  
Non purchased loans and leases | Commercial | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Commercial | 30-89 Days Past Due | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Commercial | 30-89 Days Past Due | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Commercial | 90 Days or More Past Due | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Commercial | 90 Days or More Past Due | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Commercial | Current Loans | Accruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 911,532 798,914  
Non purchased loans and leases | Commercial | Current Loans | Nonaccruing Loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Primary | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,803,750 1,682,050  
Non purchased loans and leases | Primary | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,788,658 1,668,114  
Non purchased loans and leases | Primary | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 15,092 13,936  
Non purchased loans and leases | Primary | 30-89 Days Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 16,852 14,785  
Non purchased loans and leases | Primary | 30-89 Days Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,018 1,920  
Non purchased loans and leases | Primary | 90 Days or More Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 389  
Non purchased loans and leases | Primary | 90 Days or More Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 6,812 8,195  
Non purchased loans and leases | Primary | Current Loans | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,771,806 1,652,940  
Non purchased loans and leases | Primary | Current Loans | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,262 3,821  
Non purchased loans and leases | Home equity | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 424,426 423,108  
Non purchased loans and leases | Home equity | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 422,980 422,163  
Non purchased loans and leases | Home equity | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,446 945  
Non purchased loans and leases | Home equity | 30-89 Days Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,953 1,468  
Non purchased loans and leases | Home equity | 30-89 Days Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 54 182  
Non purchased loans and leases | Home equity | 90 Days or More Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 32 0  
Non purchased loans and leases | Home equity | 90 Days or More Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,012 546  
Non purchased loans and leases | Home equity | Current Loans | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 420,995 420,695  
Non purchased loans and leases | Home equity | Current Loans | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 380 217  
Non purchased loans and leases | Rental/investment | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 274,117 268,245  
Non purchased loans and leases | Rental/investment | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 273,398 267,199  
Non purchased loans and leases | Rental/investment | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 719 1,046  
Non purchased loans and leases | Rental/investment | 30-89 Days Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 562 401  
Non purchased loans and leases | Rental/investment | 30-89 Days Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 16 0  
Non purchased loans and leases | Rental/investment | 90 Days or More Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 100 445  
Non purchased loans and leases | Rental/investment | 90 Days or More Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 438 771  
Non purchased loans and leases | Rental/investment | Current Loans | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 272,736 266,353  
Non purchased loans and leases | Rental/investment | Current Loans | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 265 275  
Non purchased loans and leases | Land development | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 142,294 135,070  
Non purchased loans and leases | Land development | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 116,113 110,395  
Non purchased loans and leases | Land development | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 141,773 134,813  
Non purchased loans and leases | Land development | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 115,784 110,051  
Non purchased loans and leases | Land development | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 521 257  
Non purchased loans and leases | Land development | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 329 344  
Non purchased loans and leases | Land development | 30-89 Days Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 332 431  
Non purchased loans and leases | Land development | 30-89 Days Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 202 476  
Non purchased loans and leases | Land development | 30-89 Days Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Land development | 30-89 Days Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Land development | 90 Days or More Past Due | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Land development | 90 Days or More Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Land development | 90 Days or More Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 333 65  
Non purchased loans and leases | Land development | 90 Days or More Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 292 292  
Non purchased loans and leases | Land development | Current Loans | Accruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 141,441 134,382  
Non purchased loans and leases | Land development | Current Loans | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 115,582 109,575  
Non purchased loans and leases | Land development | Current Loans | Nonaccruing Loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 188 192  
Non purchased loans and leases | Land development | Current Loans | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 37 52  
Non purchased loans and leases | Owner-occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,318,446 1,329,219  
Non purchased loans and leases | Owner-occupied | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,314,829 1,326,532  
Non purchased loans and leases | Owner-occupied | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 3,617 2,687  
Non purchased loans and leases | Owner-occupied | 30-89 Days Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,617 720  
Non purchased loans and leases | Owner-occupied | 30-89 Days Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,809 163  
Non purchased loans and leases | Owner-occupied | 90 Days or More Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 36  
Non purchased loans and leases | Owner-occupied | 90 Days or More Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 808 822  
Non purchased loans and leases | Owner-occupied | Current Loans | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,312,212 1,325,776  
Non purchased loans and leases | Owner-occupied | Current Loans | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 1,702  
Non purchased loans and leases | Non-owner occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,510,981 2,446,370  
Non purchased loans and leases | Non-owner occupied | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,505,360 2,440,862  
Non purchased loans and leases | Non-owner occupied | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 5,621 5,508  
Non purchased loans and leases | Non-owner occupied | 30-89 Days Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 662 260  
Non purchased loans and leases | Non-owner occupied | 30-89 Days Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Non-owner occupied | 90 Days or More Past Due | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 89  
Non purchased loans and leases | Non-owner occupied | 90 Days or More Past Due | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 0 0  
Non purchased loans and leases | Non-owner occupied | Current Loans | Accruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,504,698 2,440,513  
Non purchased loans and leases | Non-owner occupied | Current Loans | Nonaccruing Loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 5,621 $ 5,508