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

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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