Borrowings - Concerning of Other Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Other borrowings	$ 4,664	$ 6,330
Fixed Rate Amortizing Borrowing [Member]
Debt Instrument [Line Items]
Maturity date Range, From	Apr. 01, 2024
Maturity date Range, To	Jun. 01, 2037
Weighted Average Interest Rate	1.90%
Other borrowings	$ 4,664	$ 6,330
Fixed Rate Amortizing Borrowing [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated Interest Rate Range	1.16%
Fixed Rate Amortizing Borrowing [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated Interest Rate Range	2.01%

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

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Weighted average interest rate of debt outstanding.

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The noncurrent portion of Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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