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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]      
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]      
Loans, net of unearned income 1,445,607   2,249,287
Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,222,052   955,918
Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,840,979   2,686,061
Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 4,577,864   4,549,027
Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 137,115   $ 172,859
Purchased loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 974,569 1,009,903  
Purchased loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 955,147 991,290  
Purchased loans | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,387 3,683  
Purchased loans | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 38 367  
Purchased loans | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 951,722 987,240  
Purchased loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 19,422 18,613  
Purchased loans | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 4,228 340  
Purchased loans | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 4,105 4,516  
Purchased loans | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 11,089 13,757  
Purchased loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 109,368 90,308  
Purchased loans | Commercial, financial, agricultural | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 101,229 83,040  
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 316 122  
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Commercial, financial, agricultural | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 100,913 82,918  
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 8,139 7,268  
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 203 42  
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,996 1,618  
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,940 5,608  
Purchased loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,124 4,994  
Purchased loans | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,124 4,994  
Purchased loans | Real estate – construction: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Real estate – construction: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Real estate – construction: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,124 4,994  
Purchased loans | Real estate – construction: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Real estate – construction: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Real estate – construction: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Real estate – construction: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 196,392 215,773  
Purchased loans | Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 190,339 209,723  
Purchased loans | Real estate – 1-4 family mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,596 1,211  
Purchased loans | Real estate – 1-4 family mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 36  
Purchased loans | Real estate – 1-4 family mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 188,743 208,476  
Purchased loans | Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 6,053 6,050  
Purchased loans | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,078 283  
Purchased loans | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,971 2,598  
Purchased loans | Real estate – 1-4 family mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,004 3,169  
Purchased loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 632,324 663,053  
Purchased loans | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 627,186 657,996  
Purchased loans | Real estate – commercial mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 368 1,511  
Purchased loans | Real estate – commercial mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 38 323  
Purchased loans | Real estate – commercial mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 626,780 656,162  
Purchased loans | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,138 5,057  
Purchased loans | Real estate – commercial mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,931 0  
Purchased loans | Real estate – commercial mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 138 289  
Purchased loans | Real estate – commercial mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,069 4,768  
Purchased loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 31,361 35,775  
Purchased loans | Installment loans to individuals | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 31,269 35,537  
Purchased loans | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,107 839  
Purchased loans | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 8  
Purchased loans | Installment loans to individuals | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 30,162 34,690  
Purchased loans | Installment loans to individuals | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 92 238  
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 16 15  
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 11  
Purchased loans | Installment loans to individuals | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 76 212  
Purchased loans | Residential | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,259 1,287  
Purchased loans | Residential | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,259 1,287  
Purchased loans | Residential | Real estate – construction: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Residential | Real estate – construction: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Residential | Real estate – construction: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,259 1,287  
Purchased loans | Residential | Real estate – construction: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Residential | Real estate – construction: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Residential | Real estate – construction: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Residential | Real estate – construction: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Commercial | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,865 3,707  
Purchased loans | Commercial | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,865 3,707  
Purchased loans | Commercial | Real estate – construction: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Commercial | Real estate – construction: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Commercial | Real estate – construction: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,865 3,707  
Purchased loans | Commercial | Real estate – construction: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Commercial | Real estate – construction: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Commercial | Real estate – construction: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Commercial | Real estate – construction: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Primary | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 122,063 134,070  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 116,824 128,898  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,224 1,042  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 36  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 115,600 127,820  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,239 5,172  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 981 257  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,706 2,225  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,552 2,690  
Purchased loans | Home equity | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 46,239 51,496  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 45,484 50,722  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 297 149  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 45,187 50,573  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 755 774  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 97 0  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 265 373  
Purchased loans | Home equity | Real estate – 1-4 family mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 393 401  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 18,694 20,229  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 18,635 20,125  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 20  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 18,635 20,105  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 59 104  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 26  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 59 78  
Purchased loans | Land development | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 9,396 9,978  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 9,396 9,978  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 75 0  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 9,321 9,978  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – 1-4 family mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 15,942 18,344  
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 15,824 18,218  
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 38 0  
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 15,786 18,218  
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 118 126  
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 118 126  
Purchased loans | Owner-occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 220,247 234,132  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 218,164 232,139  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 314 1,511  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 323  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 217,850 230,305  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,083 1,993  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 138 289  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,945 1,704  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 396,135 410,577  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 393,198 407,639  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 54 0  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 393,144 407,639  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,937 2,938  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,931 0  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 0 0  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 6 $ 2,938