|
Held-to-Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
|
Dec. 31, 2013
|
Dec. 31, 2012
|
| Contractual maturities of held-to-maturity securities |
|
|
| Held-to-maturity securities, Total |
$ 3,836,667
|
$ 1,743,876
|
| Held-to-maturity Securities, Fair Value |
3,760,898
|
1,794,105
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
3,836,667
|
1,743,876
|
| Held-to-maturity Securities, Gross Gain |
(6,349)
|
(50,391)
|
| Held-to-maturity Securities, Gross Losses |
(82,118)
|
(162)
|
| Held-to-maturity securities, fair value |
3,760,898
|
1,794,105
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
3,001,774
|
24,739
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(79,766)
|
(162)
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
22,548
|
0
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
(2,352)
|
0
|
| Total Temporarily Impaired Securities, Fair Value |
3,024,322
|
24,739
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(82,118)
|
(162)
|
|
Federal agencies - mortgage backed securities [Member]
|
|
|
| Contractual maturities of held-to-maturity securities |
|
|
| Held-to-maturity Securities, Under 1 year |
0
|
0
|
| Held-to-maturity Securities, 1-5 years |
0
|
0
|
| Held-to-maturity Securities, 6-10 years |
24,901
|
24,901
|
| Held-to-maturity Securities, Over 10 years |
3,574,156
|
1,624,483
|
| Held-to-maturity securities, Total |
3,599,057
|
1,649,384
|
| Fair Value, Under 1 year |
0
|
0
|
| Fair Value, 1-5 years |
0
|
0
|
| Fair Value, 6-10 years |
22,549
|
24,739
|
| Fair Value, Over 10 years |
3,506,018
|
1,672,702
|
| Held-to-maturity Securities, Fair Value |
3,528,567
|
1,697,441
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
3,599,057
|
1,649,384
|
| Held-to-maturity Securities, Gross Gain |
(5,573)
|
(48,219)
|
| Held-to-maturity Securities, Gross Losses |
(76,063)
|
(162)
|
| Held-to-maturity securities, fair value |
3,528,567
|
1,697,441
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
2,849,198
|
24,739
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(73,711)
|
(162)
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
22,548
|
0
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
(2,352)
|
0
|
| Total Temporarily Impaired Securities, Fair Value |
2,871,746
|
24,739
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(76,063)
|
(162)
|
|
Other Federal Agencies [Member]
|
|
|
| Contractual maturities of held-to-maturity securities |
|
|
| Held-to-maturity Securities, Under 1 year |
0
|
0
|
| Held-to-maturity Securities, 1-5 years |
0
|
0
|
| Held-to-maturity Securities, 6-10 years |
38,588
|
15,108
|
| Held-to-maturity Securities, Over 10 years |
189,999
|
69,399
|
| Held-to-maturity securities, Total |
228,587
|
84,507
|
| Fair Value, Under 1 year |
0
|
0
|
| Fair Value, 1-5 years |
0
|
0
|
| Fair Value, 6-10 years |
39,075
|
15,338
|
| Fair Value, Over 10 years |
185,097
|
71,341
|
| Held-to-maturity Securities, Fair Value |
224,172
|
86,679
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
228,587
|
84,507
|
| Held-to-maturity Securities, Gross Gain |
(776)
|
(2,172)
|
| Held-to-maturity Securities, Gross Losses |
(5,191)
|
0
|
| Held-to-maturity securities, fair value |
224,172
|
86,679
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
144,417
|
0
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(5,191)
|
0
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
0
|
0
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
0
|
0
|
| Total Temporarily Impaired Securities, Fair Value |
144,417
|
0
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(5,191)
|
0
|
|
Municipal securities [Member]
|
|
|
| Contractual maturities of held-to-maturity securities |
|
|
| Held-to-maturity Securities, Under 1 year |
0
|
0
|
| Held-to-maturity Securities, 1-5 years |
0
|
0
|
| Held-to-maturity Securities, 6-10 years |
0
|
0
|
| Held-to-maturity Securities, Over 10 years |
9,023
|
9,985
|
| Held-to-maturity securities, Total |
9,023
|
9,985
|
| Fair Value, Under 1 year |
0
|
0
|
| Fair Value, 1-5 years |
0
|
0
|
| Fair Value, 6-10 years |
0
|
0
|
| Fair Value, Over 10 years |
8,159
|
9,985
|
| Held-to-maturity Securities, Fair Value |
8,159
|
9,985
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
9,023
|
9,985
|
| Held-to-maturity Securities, Gross Gain |
0
|
0
|
| Held-to-maturity Securities, Gross Losses |
(864)
|
0
|
| Held-to-maturity securities, fair value |
8,159
|
9,985
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
8,159
|
0
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(864)
|
0
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
0
|
0
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
0
|
0
|
| Total Temporarily Impaired Securities, Fair Value |
8,159
|
0
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(864)
|
0
|
|
Total U.S. Government backed agencies [Member]
|
|
|
| Contractual maturities of held-to-maturity securities |
|
|
| Held-to-maturity securities, Total |
3,827,644
|
1,733,891
|
| Held-to-maturity Securities, Fair Value |
3,752,739
|
1,784,120
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
3,827,644
|
1,733,891
|
| Held-to-maturity Securities, Gross Gain |
(6,349)
|
(50,391)
|
| Held-to-maturity Securities, Gross Losses |
(81,254)
|
(162)
|
| Held-to-maturity securities, fair value |
3,752,739
|
1,784,120
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
2,993,615
|
24,739
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(78,902)
|
(162)
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
22,548
|
0
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
(2,352)
|
0
|
| Total Temporarily Impaired Securities, Fair Value |
3,016,163
|
24,739
|
| Total Temporarily Impaired Securities, Unrealized Losses |
$ (81,254)
|
$ (162)
|