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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Designated as Hedging Instrument | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Income (Loss) Recognized in Earnings | $ 2,108 | $ 0 | $ 0 |
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Income (Expense), Operating | Interest Income (Expense), Operating | Interest Income (Expense), Operating |
Amount of Income (Loss) Recognized in Earnings | $ (8,512) | $ (1,187) | $ 3,422 |
Designated as Hedging Instrument | AFS debt securities | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Income (Expense), Operating | Interest Income (Expense), Operating | Interest Income (Expense), Operating |
Amount of Income (Loss) Recognized in Earnings | $ (1,049) | $ (1,120) | $ (3,422) |
Designated as Hedging Instrument | Deposits | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Income (Expense), Operating | Interest Income (Expense), Operating |  | Interest Income (Expense), Operating
Amount of Income (Loss) Recognized in Earnings | $ 3,791 | $ 0 | $ 0 |
Designated as Hedging Instrument | FHLB advances | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Income (Expense), Operating | Interest Income (Expense), Operating | Interest Income (Expense), Operating |
Amount of Income (Loss) Recognized in Earnings | $ 7,878 | $ 2,307 | $ 0 |
Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized Gain (Loss) on Derivatives | Unrealized Gain (Loss) on Derivatives | Unrealized Gain (Loss) on Derivatives |
Amount of Income (Loss) Recognized in Earnings | $ 1,869 | $ (30) | $ 2,338 |

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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 + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + 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 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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