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Loans - Schedule of Non-Purchased Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Summary of loans
Gross loans	$ 12,175,234	$ 11,585,458
Unearned income	(7,211)	(7,154)
Loans, net of unearned income	12,168,023	11,578,304	$ 11,105,004
Commercial, financial, agricultural
Summary of loans
Gross loans	1,819,891	1,673,883
Loans, net of unearned income	1,819,891		1,513,091
Lease financing
Summary of loans
Gross loans	127,935	122,167
Loans, net of unearned income	120,724		103,357
Real estate – construction:
Summary of loans
Gross loans	1,407,364	1,330,337
Loans, net of unearned income	1,407,364		1,215,056
Real estate – construction: | Residential
Summary of loans
Gross loans	300,238	355,500
Real estate – construction: | Commercial
Summary of loans
Gross loans	1,107,126	974,837
Real estate – 1-4 family mortgage:
Summary of loans
Gross loans	3,398,876	3,216,263
Loans, net of unearned income	3,398,876		3,127,889
Real estate – 1-4 family mortgage: | Primary
Summary of loans
Gross loans	2,405,703	2,222,856
Real estate – 1-4 family mortgage: | Home equity
Summary of loans
Gross loans	509,394	501,906
Real estate – 1-4 family mortgage: | Rental/investment
Summary of loans
Gross loans	353,613	334,382
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	130,166	157,119
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	130,166	157,119
Real estate – commercial mortgage:
Summary of loans
Gross loans	5,313,166	5,118,063
Loans, net of unearned income	5,313,166		5,016,665
Real estate – commercial mortgage: | Owner-occupied
Summary of loans
Gross loans	1,588,174	1,539,296
Real estate – commercial mortgage: | Non-owner occupied
Summary of loans
Gross loans	3,610,578	3,452,910
Real estate – commercial mortgage: | Land development
Summary of loans
Gross loans	114,414	125,857
Installment loans to individuals
Summary of loans
Gross loans	108,002	$ 124,745
Loans, net of unearned income	$ 108,002		$ 128,946

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

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-Topic 326
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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481598/310-20-45-2

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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