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

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- Definition

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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- Definition

Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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Stated interest rate of the subordinated debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Carrying value as of the balance sheet date of collateralized/uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Subordinated debt places a lender in a lien position behind the primary lender of the company.

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Federal Home Loan Bank Advances, Callable For Early Redemption

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Subordinated Debt, Secured Overnight Financing Rate, Term

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Borrowed Funds - Additional Information (Detail) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended
	May 28, 2021	May 25, 2021	Apr. 01, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Weighted average interest rate for short-term borrowings					0.35%		0.35%		0.38%
Payments of FHLBank borrowings				$ 248,000,000
Loss on extinguishment of debt					$ 0	$ 2,353,000	$ 8,406,000	$ 2,353,000
FHLB advances, callable for early redemption					0		0
Subordinated borrowing interest rate	3.00%	3.00%
Subordinated debt carrying value					$ 296,200,000		$ 296,200,000
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Weighted average interest rate for long-term borrowings					1.88%		1.88%		2.02%
Effective interest rate of debt				1.82%
Loss on extinguishment of debt							$ 8,400,000
Subordinated Notes Due April 2026
Debt Instrument [Line Items]
Subordinated debt, net			$ 60,000,000
Subordinated borrowing interest rate			6.25%
Subordinated Notes Due September 2023
Debt Instrument [Line Items]
Subordinated debt, net					$ 125,000,000		$ 125,000,000
Subordinated borrowing interest rate							5.125%
Subordinated Notes Due June 2025
Debt Instrument [Line Items]
Subordinated debt, net					100,000,000		$ 100,000,000
Subordinated borrowing interest rate							4.55%
Subordinated Notes Due June 2030
Debt Instrument [Line Items]
Subordinated debt, net					115,000,000		$ 115,000,000
Subordinated borrowing interest rate							5.25%
Subordinated Debt
Debt Instrument [Line Items]
Subordinated debt, net		$ 300,000,000
Subordinated debt initial term		5 years
Subordinated debt SOFR term		3 months
Subordinated Debt \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated debt basis points		2.36%
Long-Term Borrowings
Debt Instrument [Line Items]
Weighted average interest rate for long-term borrowings									3.37%
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Amount of hedged debt					$ 600,000,000		$ 600,000,000