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Federal Home Loan Bank Advances - Summary of FHLB Advances (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Federal Home Loan Bank, Advances [Line Items]
FHLB advances (fixed rates 0.45% to 4.96%    and variable rates 0.06% to 0.09%) maturing   June 2021 to January 2041	$ 1,924,155	$ 1,999,160
Fair value hedge basis adjustments and unamortized prepayment fees	(11,614)	(7,725)
Total	$ 1,912,541	$ 1,991,435
Minimum | FHLB Advances
Federal Home Loan Bank, Advances [Line Items]
Fixed rate	0.45%
Variable rate	0.06%
Maximum | FHLB Advances
Federal Home Loan Bank, Advances [Line Items]
Fixed rate	4.96%
Variable rate	0.09%

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Advances From Federal Home Loan Banks, Fair Value Hedge Basis adjustments And Unamortized Prepayment Fees

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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