Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets before its maturity.

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- Definition

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

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Amount of maintained federal fund lines of credit with correspondent banks.

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Amount of maintained line of credit with correspondent bank for the parent company.

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Term of debt issuance cost amortization, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The term for the variable rate of the debt instrument.

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Investment securities used as collateral for Federal Reserve Bank line of credit.

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Outstanding amount of federal fund lines of credit with federal reserve bank.

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Outstanding amount of line of credit with correspondent bank for the parent company.

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Borrowings - Additional Information (Detail) - USD ($)				12 Months Ended			60 Months Ended
Borrowings - Additional Information (Detail) - USD ($)	Aug. 05, 2020	Jul. 01, 2016	Mar. 30, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 14, 2030	Jun. 29, 2026	Mar. 30, 2025
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,200,000,000
Outstanding short term letters of credit				669,700,000	$ 535,600,000
Available borrowing capacity from the Federal Home Loan Bank				1,400,000,000
Investment securities collateral for Federal Reserve Bank Discount Window Lending program				40,700,000	94,800,000
Outstanding amount of federal fund line of credit with Federal Reserve Bank of Philadelphia				0	0
Amount of maintained line of credit with correspondent bank - parent company				10,000,000.0
Outstanding amount of line of credit with correspondent bank - parent company				0	0
Total committed borrowing capacity				2,200,000,000	1,900,000,000
Total committed borrowing capacity available				1,500,000,000	1,200,000,000
Amount of maintained federal fund lines of credit with correspondent banks				460,000,000.0	504,000,000.0
Proceeds from issuance of subordinated notes				100,000,000	0	$ 0
Repayment of subordinated notes				10,000,000	$ 0	$ 0
Subordinated Debt [Member] \| Fixed-to-Floating Rate, Subordinated Debt, Due in 2030 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 100,000,000.0
Annual fixed rate of interest	5.00%
Proceeds from issuance of subordinated notes	$ 98,400,000
Debt issuance costs	$ 1,600,000
Term of debt issuance costs amortization	5 years
Subordinated Debt [Member] \| Fixed-to-Floating Rate, Subordinated Debt, Due in 2030 [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Forecast [Member]
Debt Instrument [Line Items]
Basis spread of interest rate (LIBOR)							495.20%
Debt Instrument, Term of Variable Rate Basis							3 months
Subordinated Debt [Member] \| Fixed-to-Floating Rate, Subordinated Debt, Due in 2026 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt		$ 45,000,000.0
Annual fixed rate of interest		5.00%
Proceeds from issuance of subordinated notes		$ 44,500,000
Redemption price percentage of principal amount of redeemed debt		100.00%
Subordinated Debt [Member] \| Fixed-to-Floating Rate, Subordinated Debt, Due in 2026 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Forecast [Member]
Debt Instrument [Line Items]
Basis spread of interest rate (LIBOR)								3.90%
Subordinated Debt [Member] \| Fixed-to-Floating Rate, Subordinated Debt, Due in 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt			$ 50,000,000.0
Annual fixed rate of interest			5.10%
Proceeds from issuance of subordinated notes			$ 49,300,000
Redemption price percentage of principal amount of redeemed debt			100.00%
Repayment of subordinated notes				$ 10,000,000.0
Subordinated Debt [Member] \| Fixed-to-Floating Rate, Subordinated Debt, Due in 2025 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Forecast [Member]
Debt Instrument [Line Items]
Basis spread of interest rate (LIBOR)									3.544%