Contractual Maturities and Next Call Dates of Outstanding Federal Home Loan Bank Advances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Contractual Maturity
Amount
2014	$ 3,373,117
2015	200,719
2017	630,521
2018	932,676
2019	1,865,000
2020	650,000
2022	1,410,000
2023	1,810,312
2025	231
Total FHLB advances	10,872,576
Weighted Average Interest Rate
2014	0.43%
2015	2.92%
2017	3.02%
2018	3.03%
2019	3.15%
2020	2.90%
2022	3.41%
2023	3.34%
2025	7.82%
Total FHLB advances	2.33%
Earlier of Contractual Maturity or Next Call Date
Amount
2014	5,135,317
2015	1,315,719
2016	900,000
2017	3,520,312
2018	997
2025	231
Total FHLB advances	$ 10,872,576
Weighted Average Interest Rate
2014	1.32%
2015	3.12%
2016	3.01%
2017	3.35%
2018	2.92%
2025	7.82%
Total FHLB advances	2.33%