Allowance for Credit Losses, Credit Quality and Other - Schedule of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 288,234	$ 289,669	$ 236,714
Allowance for credit losses on PCD loans - Happy acquisition			16,816
Loans charged off	(63,036)	(16,055)	(17,267)
Recoveries of loans previously charged off	2,282	2,670	3,236
Net loans (charged off) recovered	(60,754)	(13,385)	(14,031)
Provision for credit loss - acquired loans			45,170
Provision for credit loss - loans	48,400	11,950	5,000
Ending balance	275,880	288,234	289,669
Residential Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	55,860	50,963	48,458
Allowance for credit losses on PCD loans - Happy acquisition			980
Loans charged off	(7,067)	(269)	(446)
Recoveries of loans previously charged off	180	329	119
Net loans (charged off) recovered	(6,887)	60	(327)
Provision for credit loss - acquired loans			7,380
Provision for credit loss - loans	1,862	4,837	(5,528)
Ending balance	50,835	55,860	50,963
Commercial & Industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	92,810	89,354	53,062
Allowance for credit losses on PCD loans - Happy acquisition			5,596
Loans charged off	(11,089)	(9,157)	(9,773)
Recoveries of loans previously charged off	628	583	780
Net loans (charged off) recovered	(10,461)	(8,574)	(8,993)
Provision for credit loss - acquired loans			11,303
Provision for credit loss - loans	(32,728)	12,030	28,386
Ending balance	49,621	92,810	89,354
Consumer & Other
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	27,052	23,261	19,561
Allowance for credit losses on PCD loans - Happy acquisition			7
Loans charged off	(5,311)	(4,031)	(7,047)
Recoveries of loans previously charged off	1,194	1,112	965
Net loans (charged off) recovered	(4,117)	(2,919)	(6,082)
Provision for credit loss - acquired loans			571
Provision for credit loss - loans	8,903	6,710	9,204
Ending balance	31,838	27,052	23,261
Construction/ Land Development \| Commercial real estate loans
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	33,877	32,243	28,415
Allowance for credit losses on PCD loans - Happy acquisition			950
Loans charged off	(1,437)	(263)	(1)
Recoveries of loans previously charged off	221	113	405
Net loans (charged off) recovered	(1,216)	(150)	404
Provision for credit loss - acquired loans			7,205
Provision for credit loss - loans	19,610	1,784	(4,731)
Ending balance	52,271	33,877	32,243
Other Commercial Real Estate \| Commercial real estate loans
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	78,635	93,848	87,218
Allowance for credit losses on PCD loans - Happy acquisition			9,283
Loans charged off	(38,132)	(2,335)	0
Recoveries of loans previously charged off	59	533	967
Net loans (charged off) recovered	(38,073)	(1,802)	967
Provision for credit loss - acquired loans			18,711
Provision for credit loss - loans	50,753	(13,411)	(22,331)
Ending balance	$ 91,315	$ 78,635	$ 93,848

Financing Receivable, Acquired Loans and Investments, Credit Loss, Expense (Reversal)

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- Definition

Financing receivable allowance for credit losses recoveries of loans previously charged off.

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Financing receivable allowance for credit losses recovery (charged off).

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- 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

Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration.

+ References

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

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-19

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