Contractual Maturities of Outstanding Federal Home Loan Bank Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Year of Maturity
Total FHLB advances	$ 13,102,661	$ 13,053,661
Contractual Maturity
Year of Maturity
2020	4,525,000
2021	822,661
2022	275,000
2023	0
2028	4,350,000
2029	3,130,000
Total FHLB advances	$ 13,102,661
Weighted Average Interest Rate
2020	2.06%
2021	2.40%
2022	2.01%
2023	0.00%
2028	2.40%
2029	1.55%
Total FHLB advances	2.07%
Earlier of Contractual Maturity or Next Call Date
Year of Maturity
2020	$ 6,805,000
2021	4,222,661
2022	1,875,000
2023	200,000
2028	0
2029	0
Total FHLB advances	$ 13,102,661
Weighted Average Interest Rate
2020	2.09%
2021	2.30%
2022	1.55%
2023	1.61%
2028	0.00%
2029	0.00%
Total FHLB advances	2.07%