Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets
Total cash and cash equivalents	$ 204,698	$ 281,285
Investment securities available-for-sale, at fair value (with amortized cost of $2,997,047 at December 31, 2024, and $3,398,942 at December 31, 2023)	2,542,115	2,956,125
Investment securities held-to-maturity (with fair value of $1,954,345 at December 31, 2024, and $2,082,881 at December 31, 2023)	2,379,668	2,464,610
Loans and lease finance receivables	8,536,432	8,904,910
Total loans, net of allowance for credit losses	8,456,310	8,818,068
Interest rate swaps	8,086	1,235
Deposits:
Interest-bearing	$ 4,911,285	4,227,467
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Securities Sold under Agreements to Repurchase
Interest rate swaps
Assets
Interest rate swaps	$ 261,917	112
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	30	271,754
Interest rate swaps \| Derivatives designated as hedging instruments
Assets
Interest rate swaps	0	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0	0
Interest rate swaps \| Derivatives Not Designated as Hedging Instruments [Member]
Assets
Interest rate swaps	30	112
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	30	112
Cash Flow Hedging [Member] \| Interest rate swaps
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Carrying Value [Member]
Assets
Total cash and cash equivalents	204,698	281,285
Interest-earning balances due from depository institutions	480	8,216
Investment securities available-for-sale, at fair value (with amortized cost of $2,997,047 at December 31, 2024, and $3,398,942 at December 31, 2023)	2,542,115	2,956,125
Investment securities held-to-maturity (with fair value of $1,954,345 at December 31, 2024, and $2,082,881 at December 31, 2023)	2,379,668	2,464,610
Total loans, net of allowance for credit losses	8,456,310	8,818,068
Interest rate swaps		112
Deposits:
Interest-bearing	4,911,285	4,227,467
Borrowings	761,887	2,341,642
Junior subordinated debentures	0	0
Carrying Value [Member] \| Derivatives designated as hedging instruments
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		6,938
Carrying Value [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		112
Carrying Value [Member] \| Interest rate swaps \| Derivatives Not Designated as Hedging Instruments [Member]
Assets
Interest rate swaps	30	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	30
Carrying Value [Member] \| Fair Value Hedging [Member] \| Interest rate swaps \| Derivatives designated as hedging instruments
Assets
Interest rate swaps	7,222
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Carrying Value [Member] \| Cash Flow Hedging [Member] \| Interest rate swaps
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	517
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	204,698	281,285
Interest-earning balances due from depository institutions	480	8,216
Investment securities available-for-sale, at fair value (with amortized cost of $2,997,047 at December 31, 2024, and $3,398,942 at December 31, 2023)	2,542,115	2,956,125
Investment securities held-to-maturity (with fair value of $1,954,345 at December 31, 2024, and $2,082,881 at December 31, 2023)	1,954,345	2,082,881
Total loans, net of allowance for credit losses	8,149,801	8,503,518
Interest rate swaps		112
Deposits:
Interest-bearing	4,908,070	4,222,773
Borrowings	716,566	2,283,631
Junior subordinated debentures	0	0
Estimated Fair Value [Member] \| Level 1 [Member]
Assets
Total cash and cash equivalents	204,698	281,285
Interest-earning balances due from depository institutions	0	0
Investment securities available-for-sale, at fair value (with amortized cost of $2,997,047 at December 31, 2024, and $3,398,942 at December 31, 2023)	0	0
Investment securities held-to-maturity (with fair value of $1,954,345 at December 31, 2024, and $2,082,881 at December 31, 2023)	0	0
Total loans, net of allowance for credit losses	0	0
Deposits:
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	0	0
Estimated Fair Value [Member] \| Level 2 [Member]
Assets
Total cash and cash equivalents	0	0
Interest-earning balances due from depository institutions	480	8,216
Investment securities available-for-sale, at fair value (with amortized cost of $2,997,047 at December 31, 2024, and $3,398,942 at December 31, 2023)	2,542,115	2,956,125
Investment securities held-to-maturity (with fair value of $1,954,345 at December 31, 2024, and $2,082,881 at December 31, 2023)	1,954,345	2,082,881
Total loans, net of allowance for credit losses	0	0
Interest rate swaps		112
Deposits:
Interest-bearing	4,908,070	4,222,773
Borrowings	716,566	2,283,631
Junior subordinated debentures	0	0
Estimated Fair Value [Member] \| Level 3 [Member]
Assets
Total cash and cash equivalents	0	0
Interest-earning balances due from depository institutions	0	0
Investment securities available-for-sale, at fair value (with amortized cost of $2,997,047 at December 31, 2024, and $3,398,942 at December 31, 2023)	0	0
Investment securities held-to-maturity (with fair value of $1,954,345 at December 31, 2024, and $2,082,881 at December 31, 2023)	0	0
Total loans, net of allowance for credit losses	8,149,801	8,503,518
Deposits:
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	0	0
Estimated Fair Value [Member] \| Derivatives designated as hedging instruments
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		6,938
Estimated Fair Value [Member] \| Derivatives designated as hedging instruments \| Level 1 [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		0
Estimated Fair Value [Member] \| Derivatives designated as hedging instruments \| Level 2 [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		6,938
Estimated Fair Value [Member] \| Derivatives designated as hedging instruments \| Level 3 [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		0
Estimated Fair Value [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		112
Estimated Fair Value [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Level 1 [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		0
Estimated Fair Value [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Level 2 [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		112
Estimated Fair Value [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Level 3 [Member]
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets		0
Estimated Fair Value [Member] \| Interest rate swaps \| Derivatives Not Designated as Hedging Instruments [Member]
Assets
Interest rate swaps	30	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	30
Estimated Fair Value [Member] \| Interest rate swaps \| Derivatives Not Designated as Hedging Instruments [Member] \| Level 1 [Member]
Assets
Interest rate swaps	0	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Estimated Fair Value [Member] \| Interest rate swaps \| Derivatives Not Designated as Hedging Instruments [Member] \| Level 2 [Member]
Assets
Interest rate swaps	30	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	30
Estimated Fair Value [Member] \| Interest rate swaps \| Derivatives Not Designated as Hedging Instruments [Member] \| Level 3 [Member]
Assets
Interest rate swaps	0	$ 0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Estimated Fair Value [Member] \| Fair Value Hedging [Member] \| Interest rate swaps \| Derivatives designated as hedging instruments
Assets
Interest rate swaps	7,222
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Estimated Fair Value [Member] \| Fair Value Hedging [Member] \| Interest rate swaps \| Derivatives designated as hedging instruments \| Level 1 [Member]
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Estimated Fair Value [Member] \| Fair Value Hedging [Member] \| Interest rate swaps \| Derivatives designated as hedging instruments \| Level 2 [Member]
Assets
Interest rate swaps	7,222
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Estimated Fair Value [Member] \| Fair Value Hedging [Member] \| Interest rate swaps \| Derivatives designated as hedging instruments \| Level 3 [Member]
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Estimated Fair Value [Member] \| Cash Flow Hedging [Member] \| Interest rate swaps
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	517
Estimated Fair Value [Member] \| Cash Flow Hedging [Member] \| Interest rate swaps \| Level 1 [Member]
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	0
Estimated Fair Value [Member] \| Cash Flow Hedging [Member] \| Interest rate swaps \| Level 2 [Member]
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	517
Estimated Fair Value [Member] \| Cash Flow Hedging [Member] \| Interest rate swaps \| Level 3 [Member]
Assets
Interest rate swaps	0
Deposits:
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	$ 0

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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.

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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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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