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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | $ 2,837,100 | $ 2,956,125
Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 25,144 | 25,635
Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 | 0
Interest rate swaps, liabilities | 275,758 | 271,754
Interest Rate Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 | 0
Interest rate swaps, liabilities | 38 | 112
Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets |  | 0
Interest rate swaps, liabilities | 0 | 0
Carrying Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 2,837,100 | 2,956,125
Fair Value Hedges [Member] | Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 |
Interest rate swaps, liabilities | 0 |
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 0 |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 |
Total assets | 0 | 0
Total liabilities | 0 | 0
Fair Value on Recurring Basis [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 2,837,100 |
Total assets | 2,848,820 | 2,956,237
Total liabilities | 38 | 7,050
Fair Value on Recurring Basis [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 |
Total assets | 0 | 0
Total liabilities | 0 | 0
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 25,144 | 25,635
Fair Value on Recurring Basis [Member] | Municipal Bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Government agency/GSE [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Government agency/GSE [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 32,640 | 32,253
Fair Value on Recurring Basis [Member] | Government agency/GSE [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Residential Mortgage-backed Securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Residential Mortgage-backed Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 2,399,107 | 2,507,679
Fair Value on Recurring Basis [Member] | Residential Mortgage-backed Securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | CMO/REMIC - Residential [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | CMO/REMIC - Residential [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 378,894 | 389,362
Fair Value on Recurring Basis [Member] | CMO/REMIC - Residential [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 1,315 | 1,196
Fair Value on Recurring Basis [Member] | Other Securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 0 | 0
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale |  | 0
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale |  | 2,956,125
Fair Value on Recurring Basis [Member] | Investment Securities-AFS [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale |  | 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets |  | 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets |  | 112
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets |  | 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 | 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 38 |
Interest rate swaps, liabilities | 38 | 112
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 | 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities |  | 0
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities |  | 6,938
Fair Value on Recurring Basis [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities |  | 0
Fair Value on Recurring Basis [Member] | Carrying Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 2,837,100 |
Total assets | 2,848,820 | 2,956,237
Total liabilities | 38 | 7,050
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 25,144 | 25,635
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Government agency/GSE [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 32,640 | 32,253
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Residential Mortgage-backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 2,399,107 | 2,507,679
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | CMO/REMIC - Residential [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 378,894 | 389,362
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Other Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale | 1,315 | 1,196
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Investment Securities-AFS [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Available-for-sale |  | 2,956,125
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets |  | 112
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 38 |
Interest rate swaps, liabilities | 38 | 112
Fair Value on Recurring Basis [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities |  | $ 6,938
Fair Value on Recurring Basis [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Fair Value Hedges [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 10,893 |
Fair Value on Recurring Basis [Member] | Fair Value Hedges [Member] | Carrying Value [Member] | Derivatives designated as hedging instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Fair Value Hedges [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 10,893 |
Fair Value on Recurring Basis [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | 789 |
Fair Value on Recurring Basis [Member] | Cash Flow Hedges [Member] | Carrying Value [Member] | Derivatives designated as hedging instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, liabilities | 0 |
Fair Value on Recurring Basis [Member] | Cash Flow Hedges [Member] | Carrying Value [Member] | Interest Rate Swaps [Member] | Derivatives designated as hedging instruments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest rate swaps, assets | $ 789 |

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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