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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Total cash and cash equivalents | $ 949,589 | $ 281,285
Fair Value, Available-for-sale | 2,837,100 | 2,956,125
Investment securities held-to-maturity | 2,454,586 | 2,464,610
Total loans, net of allowance for loan losses | 8,687,896 | 8,818,068
Deposits: |  |
Interest-bearing | 4,782,132 | 4,227,467
Carrying Value [Member] |  |
Assets |  |
Total cash and cash equivalents | 949,589 | 281,285
Interest-earning balances due from depository institutions | 12,632 | 8,216
Fair Value, Available-for-sale | 2,837,100 | 2,956,125
Investment securities held-to-maturity | 2,454,586 | 2,464,610
Total loans, net of allowance for loan losses | 8,687,896 | 8,818,068
Deposits: |  |
Interest-bearing | 4,782,132 | 4,227,467
Borrowings | 2,270,720 | 2,341,642
Carrying Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets |  | 0
Carrying Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets | 38 | 112
Deposits: |  |
Interest rate swaps, liabilities | 38 | 112
Carrying Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets | 10,893 |
Deposits: |  |
Interest rate swaps, liabilities | 0 | 6,938
Carrying Value [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets | 789 |
Deposits: |  |
Interest rate swaps, liabilities | 0 |
Estimated Fair Value [Member] |  |
Assets |  |
Total cash and cash equivalents | 949,589 | 281,285
Interest-earning balances due from depository institutions | 12,632 | 8,216
Fair Value, Available-for-sale | 2,837,100 | 2,956,125
Investment securities held-to-maturity | 2,044,031 | 2,082,881
Total loans, net of allowance for loan losses | 8,273,529 | 8,503,518
Deposits: |  |
Interest-bearing | 4,777,393 | 4,222,773
Borrowings | 2,204,434 | 2,283,631
Estimated Fair Value [Member] | Level 1 [Member] |  |
Assets |  |
Total cash and cash equivalents | 949,589 | 281,285
Interest-earning balances due from depository institutions | 0 | 0
Fair Value, Available-for-sale | 0 | 0
Investment securities held-to-maturity | 0 | 0
Total loans, net of allowance for loan losses | 0 | 0
Deposits: |  |
Interest-bearing | 0 | 0
Borrowings | 0 | 0
Estimated Fair Value [Member] | Level 2 [Member] |  |
Assets |  |
Total cash and cash equivalents | 0 | 0
Interest-earning balances due from depository institutions | 12,632 | 8,216
Fair Value, Available-for-sale | 2,837,100 | 2,956,125
Investment securities held-to-maturity | 2,044,031 | 2,082,881
Total loans, net of allowance for loan losses | 0 | 0
Deposits: |  |
Interest-bearing | 4,777,393 | 4,222,773
Borrowings | 2,204,434 | 2,283,631
Estimated Fair Value [Member] | Level 3 [Member] |  |
Assets |  |
Total cash and cash equivalents | 0 | 0
Interest-earning balances due from depository institutions | 0 | 0
Fair Value, Available-for-sale | 0 | 0
Investment securities held-to-maturity | 0 | 0
Total loans, net of allowance for loan losses | 8,273,529 | 8,503,518
Deposits: |  |
Interest-bearing | 0 | 0
Borrowings | 0 | 0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets |  | 0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 1 [Member] |  |
Assets |  |
Interest rate swaps, assets |  | 0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 2 [Member] |  |
Assets |  |
Interest rate swaps, assets |  | 0
Estimated Fair Value [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Assets |  |
Interest rate swaps, assets |  | 0
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets | 38 | 112
Deposits: |  |
Interest rate swaps, liabilities | 38 | 112
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Level 1 [Member] |  |
Assets |  |
Interest rate swaps, assets | 0 | 0
Deposits: |  |
Interest rate swaps, liabilities | 0 | 0
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Level 2 [Member] |  |
Assets |  |
Interest rate swaps, assets | 38 | 112
Deposits: |  |
Interest rate swaps, liabilities | 38 | 112
Estimated Fair Value [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Assets |  |
Interest rate swaps, assets | 0 | 0
Deposits: |  |
Interest rate swaps, liabilities | 0 | 0
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets | 10,893 |
Deposits: |  |
Interest rate swaps, liabilities | 0 | 6,938
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 1 [Member] |  |
Assets |  |
Interest rate swaps, assets | 0 |
Deposits: |  |
Interest rate swaps, liabilities | 0 | 0
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 2 [Member] |  |
Assets |  |
Interest rate swaps, assets | 10,893 |
Deposits: |  |
Interest rate swaps, liabilities | 0 | 6,938
Estimated Fair Value [Member] | Fair Value Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Assets |  |
Interest rate swaps, assets | 0 |
Deposits: |  |
Interest rate swaps, liabilities | 0 | $ 0
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] |  |
Assets |  |
Interest rate swaps, assets | 789 |
Deposits: |  |
Interest rate swaps, liabilities | 0 |
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 1 [Member] |  |
Assets |  |
Interest rate swaps, assets | 0 |
Deposits: |  |
Interest rate swaps, liabilities | 0 |
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 2 [Member] |  |
Assets |  |
Interest rate swaps, assets | 789 |
Deposits: |  |
Interest rate swaps, liabilities | 0 |
Estimated Fair Value [Member] | Cash Flow Hedges [Member] | Derivatives designated as hedging instruments [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Assets |  |
Interest rate swaps, assets | 0 |
Deposits: |  |
Interest rate swaps, liabilities | $ 0 |

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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 Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + 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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