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Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 109,853	$ 90,967		$ 90,967
Initial provision for credit losses on unfunded commitments acquired from GrandSouth	1,800	11,451		19,750
Charge-offs	(2,115)	(2,621)		(10,175)
Recoveries	529	989		3,701
Ending balance	110,067	106,396		109,853
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,369	13,306		13,306
Initial provision for credit losses on unfunded commitments acquired from GrandSouth	(601)		$ (870)	(3,858)
Charge-offs	0		0	0
Recoveries	0		0	0
Ending balance	10,768	$ 14,357		11,369
Unfunded Loan Commitment | GrandSouth
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Initial provision for credit losses on unfunded commitments acquired from GrandSouth	$ 0		$ 1,921	$ 1,921

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on 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
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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