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Allowance for Loan Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 9,773,049   $ 9,693,463
Unearned income (3,672)   (3,825)
Loans, net of unearned income 9,769,377   9,689,638
Allowance for credit losses (120,185)   (52,162)
Loans, net 9,649,192   9,637,476
Cumulative Effect, Period Of Adoption, Adjusted Balance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income     9,689,638
Allowance for credit losses   $ (94,646)  
Commercial, financial, agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,424,576   1,367,972
Loans, net of unearned income     1,367,972
Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 88,351   85,700
Real estate – construction:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 787,895   826,483
Loans, net of unearned income     826,483
Real estate – construction: | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 289,000   289,050
Real estate – construction: | Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 498,895   537,433
Real estate – 1-4 family mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,846,301   2,866,613
Loans, net of unearned income     2,866,613
Real estate – 1-4 family mortgage: | Primary      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,776,436   1,781,948
Real estate – 1-4 family mortgage: | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 563,726   573,540
Real estate – 1-4 family mortgage: | Rental/investment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 329,466   335,100
Real estate – 1-4 family mortgage: | Land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 176,673   176,025
Real estate – commercial mortgage:      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 4,308,708   4,244,265
Loans, net of unearned income     4,244,265
Real estate – commercial mortgage: | Land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 160,768   156,089
Real estate – commercial mortgage: | Owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 1,662,998   1,637,281
Real estate – commercial mortgage: | Non-owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 2,484,942   2,450,895
Installment loans to individuals      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 317,218   302,430
Loans, net of unearned income     $ 384,305