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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ (6,549) | $ 2,448 | $ (8,920) | $ 15,874
Fair Value Hedging [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | (6,124) | 1,888 | (6,905) | 14,758
Cash Flow Hedging [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | (425) | 560 | (2,015) | 1,116
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] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 1,419 | $ 5,015 | $ 2,639 | $ 8,880
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 1,257 | $ 4,097 | $ 2,309 | $ 7,784
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Comprehensive Income (Loss), Net of Tax, Attributable to Parent | Comprehensive Income (Loss), Net of Tax, Attributable to Parent | Comprehensive Income (Loss), Net of Tax, Attributable to Parent | Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 162 | $ 918 | $ 330 | $ 1,096
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Comprehensive Income (Loss), Net of Tax, Attributable to Parent | Comprehensive Income (Loss), Net of Tax, Attributable to Parent | Comprehensive Income (Loss), Net of Tax, Attributable to Parent | Comprehensive Income (Loss), Net of Tax, Attributable to Parent

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 + Details
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