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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 10,016,824 $ 10,933,647 $ 11,084,738
Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,436,019   2,648,062
Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,091,296   773,119
Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,724,743   2,760,394
Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 4,535,730   4,577,009
Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 149,821   $ 243,226
Purchased loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,140,944 1,514,107  
Purchased loans | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,114,452 1,483,056  
Purchased loans | Accruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,197 8,651  
Purchased loans | Accruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 74 267  
Purchased loans | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,111,181 1,474,138  
Purchased loans | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 26,492 31,051  
Purchased loans | Nonaccruing Loans | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 498 8,671  
Purchased loans | Nonaccruing Loans | 90 Days or More Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,299 6,968  
Purchased loans | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 20,695 15,412  
Purchased loans | Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 114,450 176,513  
Purchased loans | Commercial, financial, agricultural | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 104,602 164,577  
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 183 818  
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 1 101  
Purchased loans | Commercial, financial, agricultural | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 104,418 163,658  
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 9,848 11,936  
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 66 74  
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 1,640 2,024  
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 8,142 9,838  
Purchased loans | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 4,993 30,952  
Purchased loans | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 4,993 30,952  
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 4,993 30,952  
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 240,347 341,744  
Purchased loans | Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 233,958 333,644  
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 1,352 2,977  
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 26 131  
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 232,580 330,536  
Purchased loans | Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 6,389 8,100  
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 428 691  
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 3,227 4,197  
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 2,734 3,212  
Purchased loans | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 740,832 905,223  
Purchased loans | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 730,826 894,483  
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 791 2,830  
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 0 0  
Purchased loans | Real estate – commercial mortgage: | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 730,035 891,653  
Purchased loans | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 10,006 10,740  
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 0 7,875  
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 409 611  
Purchased loans | Real estate – commercial mortgage: | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 9,597 2,254  
Purchased loans | Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 40,322 59,675  
Purchased loans | Installment loans to individuals | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 40,073 59,400  
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 871 2,026  
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 47 35  
Purchased loans | Installment loans to individuals | Accruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 39,155 57,339  
Purchased loans | Installment loans to individuals | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 249 275  
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 4 31  
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 23 136  
Purchased loans | Installment loans to individuals | Nonaccruing Loans | Current Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 222 108  
Purchased loans | Residential | Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,288 2,859  
Purchased loans | Residential | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,288 2,859  
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 1,288 2,859  
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 3,705 28,093  
Purchased loans | Commercial | Real estate – construction: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,705 28,093  
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 3,705 28,093  
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 150,944 214,770  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 145,972 209,103  
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 639 2,394  
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 74  
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 145,333 206,635  
Purchased loans | Primary | Real estate – 1-4 family mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 4,972 5,667  
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 428 687  
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 2,360 2,799  
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 2,184 2,181  
Purchased loans | Home equity | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 56,692 80,392  
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 55,389 79,076  
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 490 294  
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 43  
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 54,899 78,739  
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 1,303 1,316  
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 0 4  
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 813 674  
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 490 638  
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 22,507 31,928  
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 22,405 31,125  
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 148 180  
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 26 14  
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 22,231 30,931  
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 102 803  
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 0  
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 54 724  
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 48 79  
Purchased loans | Land development | Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 10,204 14,654  
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 10,192 14,340  
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 75 109  
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 10,117 14,231  
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 12 314  
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 12 314  
Purchased loans | Land development | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 19,791 29,454  
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 19,539 29,074  
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 167 112  
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 0 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 19,372 28,962  
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 252 380  
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 118 164  
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 134 216  
Purchased loans | Owner-occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 264,939 323,041  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 263,004 320,508  
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 624 2,511  
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 0  
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 262,380 317,997  
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,935 2,533  
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 0 193  
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 291 447  
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 1,644 1,893  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 456,102 552,728  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 448,283 544,901  
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 0 207  
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 448,283 544,694  
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 7,819 7,827  
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 0 7,682  
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 $ 7,819 $ 145