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Subordinated Debentures - Additional Information (Detail) (Subordinated Debentures, USD $) In Millions, unless otherwise specified	1 Months Ended
	Dec. 31, 2005
Subordinated Debentures
Subordinated Borrowing [Line Items]
Proceeds from issuance of subordinated long-term debt	$ 4.0
Debt instrument maturity date year	2035
Debt instrument, interest rate, stated percentage	6.25%
Mandatorily redeemable debt securities	$ 4.0
Subordinated debenture variable interest rate	1.35%
Libor rate	0.30%

- Definition

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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