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Loans - Schedule of Non-Purchased Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Summary of loans
Gross loans	$ 12,506,121	$ 12,358,017
Unearned income	(5,596)	(6,787)
Loans, net of unearned income	12,500,525	12,351,230	$ 11,766,425
Commercial, financial, agricultural
Summary of loans
Gross loans	1,869,408	1,871,821
Loans, net of unearned income	1,869,408		1,740,778
Lease financing
Summary of loans
Gross loans	113,070	122,807
Loans, net of unearned income	107,474		121,146
Real estate – construction:
Summary of loans
Gross loans	1,243,535	1,333,397
Loans, net of unearned income	1,243,535		1,424,352
Real estate – construction: | Residential
Summary of loans
Gross loans	271,966	269,616
Real estate – construction: | Commercial
Summary of loans
Gross loans	971,569	1,063,781
Real estate – 1-4 family mortgage:
Summary of loans
Gross loans	3,429,286	3,439,919
Loans, net of unearned income	3,429,286		3,278,980
Real estate – 1-4 family mortgage: | Primary
Summary of loans
Gross loans	2,404,521	2,422,482
Real estate – 1-4 family mortgage: | Home equity
Summary of loans
Gross loans	525,346	522,688
Real estate – 1-4 family mortgage: | Rental/investment
Summary of loans
Gross loans	387,556	373,755
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	111,863	120,994
Real estate – 1-4 family mortgage: | Land development
Summary of loans
Gross loans	111,863	120,994
Real estate – commercial mortgage:
Summary of loans
Gross loans	5,753,230	5,486,550
Loans, net of unearned income	5,753,230		5,085,813
Real estate – commercial mortgage: | Owner-occupied
Summary of loans
Gross loans	1,678,911	1,648,961
Real estate – commercial mortgage: | Non-owner occupied
Summary of loans
Gross loans	3,970,881	3,733,174
Real estate – commercial mortgage: | Land development
Summary of loans
Gross loans	103,438	104,415
Installment loans to individuals
Summary of loans
Gross loans	97,592	$ 103,523
Loans, net of unearned income	$ 97,592		$ 115,356

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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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
-SubTopic 20
-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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+ References

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