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Borrowed Funds - Additional Information (Detail) - USD ($) $ in Thousands	Nov. 06, 2018	Mar. 31, 2019	Dec. 31, 2018	Nov. 16, 2018
Debt Instrument [Line Items]
Junior subordinated debentures		$ 359,594	$ 359,508
Subordinated Debt
Debt Instrument [Line Items]
Capital security, coupon or distribution rate				5.90%
Principal amount of Subordinated Notes				$ 300,000
interest rate of subordinated note				5.90%
description of interest rate	LIBOR rate plus 278 basis points
maturity date of debt	Nov. 06, 2028

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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- Definition

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

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- Definition

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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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

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