Investment Securities AFS and HTM Contractual Maturity Table (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Amortized Cost
Available for Sale, Due in one year or less	$ 39,763
Available for Sale, Due after one year through five years	236,730
Available for Sale, Due after five years through ten years	140,072
Available for Sale, Due after ten years	585
Available for Sale, Total debt securities	417,150
Fair Value
Available for Sale, Due in one year or less	40,025
Available for Sale, Due after one year through five years	248,772
Available for Sale, Due after five years through ten years	145,956
Available for Sale, Due after ten years	599
Available for Sale, Total debt securities	435,352
Investment securities available for sale, amortized cost	5,344,040	$ 5,368,259
Investment securities available for sale, at fair value	$ 5,403,656	5,396,812
Ratio of Fair Value to Amortized Cost	101.10%
Amortized Cost
Held to Maturity, Due in one year or less	$ 0
Held to Maturity, Due after one year through five years	3,980
Held to Maturity, Due after five years through ten years	133,801
Held to Maturity, Due after ten years	467,018
Amortized cost	604,799	404,455
Fair Value
Held to Maturity, Due in one year or less	0
Held to Maturity, Due after one year through five years	4,042
Held to Maturity, Due after five years through ten years	136,164
Held to Maturity, Due after ten years	473,166
Held to Maturity, Total debt securities	$ 613,372	413,067
Ratio of Fair Value to Amortized Cost	101.40%
Federal National Mortgage Association Certificates and Obligations (FNMA) and Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Fair Value
Investment securities available for sale, amortized cost	$ 1,932,740	3,534,240
Investment securities available for sale, at fair value	1,980,790	3,563,457
Government National Mortgage Association (GNMA) [Member]
Fair Value
Investment securities available for sale, amortized cost	1,106,601	165,863
Investment securities available for sale, at fair value	1,108,133	167,332
Private Label [Member]
Fair Value
Investment securities available for sale, amortized cost	1,755	2,297
Investment securities available for sale, at fair value	1,746	2,294
GSE commercial mortgage-related securities [Member]
Fair Value
Investment securities available for sale, amortized cost	1,885,776	1,097,913
Investment securities available for sale, at fair value	1,877,581	$ 1,073,893
Equity Securities [Member]
Fair Value
Investment securities available for sale, amortized cost	18
Investment securities available for sale, at fair value	$ 54

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