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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	$ 2,448	$ 7,846	$ 15,874	$ 7,846
Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	1,888	7,846	14,758	7,846
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	560	0	1,116	0
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	0	0	0	0
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	$ 0	$ 0	$ 0	$ 0
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income	Noninterest Income	Noninterest Income	Noninterest Income
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	$ 5,015	$ 446	$ 8,880	$ 446
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	$ 4,097	$ 446	$ 7,784	$ 446
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Amount of Gains (Losses) Recognized in Net Interest Income on Derivative Instruments	$ 918	$ 0	$ 1,096	$ 0
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating

X

- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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- Definition

Indicates line item in statement of income or comprehensive income that includes gain from derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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