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Purchased Loans - Performing Status (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 10,933,647	$ 9,689,638
Commercial, financial, agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,536,984	1,367,972
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	75,862
Real estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	858,104	826,483
Real estate - 1-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,698,308	2,866,613
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	4,554,852	4,244,265
Installment loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	209,537	384,305
Purchased
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,514,107	2,101,664
Purchased | Performing and Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		543,747
Purchased | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		539,747
Purchased | Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		4,000
Purchased | Commercial, financial, agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	176,513	315,619
Purchased | Commercial, financial, agriculture | Performing and Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		13,935
Purchased | Commercial, financial, agriculture | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		13,935
Purchased | Commercial, financial, agriculture | Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		0
Purchased | Real estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	30,952	51,582
Purchased | Real estate - construction | Performing and Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		1,725
Purchased | Real estate - construction | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		1,725
Purchased | Real estate - construction | Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		0
Purchased | Real estate - 1-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	341,744	516,487
Purchased | Real estate - 1-4 family mortgage | Performing and Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		398,114
Purchased | Real estate - 1-4 family mortgage | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		394,476
Purchased | Real estate - 1-4 family mortgage | Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		3,638
Purchased | Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	905,223	1,115,389
Purchased | Real estate - commercial mortgage | Performing and Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		30,573
Purchased | Real estate - commercial mortgage | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		30,472
Purchased | Real estate - commercial mortgage | Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		101
Purchased | Installment loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 59,675	102,587
Purchased | Installment loans to individuals | Performing and Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		99,400
Purchased | Installment loans to individuals | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		99,139
Purchased | Installment loans to individuals | Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income		$ 261

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