|
Held-to-Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
|
Sep. 30, 2014
|
Dec. 31, 2013
|
| Contractual maturities of held-to-maturity securities |
|
|
| Held-to-maturity securities, Total |
$ 3,496,493
|
$ 3,836,667
|
| Held-to-maturity Securities, Fair Value |
3,467,056
|
3,760,898
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
3,496,493
|
3,836,667
|
| Held-to-maturity Securities, Gross Gain |
(15,403)
|
(6,349)
|
| Held-to-maturity Securities, Gross Losses |
44,840
|
82,118
|
| Held-to-maturity securities, fair value |
3,467,056
|
3,760,898
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
1,550,114
|
3,001,774
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(17,637)
|
(79,766)
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
740,342
|
22,548
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
(27,203)
|
(2,352)
|
| Total Temporarily Impaired Securities, Fair Value |
2,290,456
|
3,024,322
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(44,840)
|
(82,118)
|
|
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 |
3,249,587
|
3,574,156
|
| Held-to-maturity securities, Total |
3,274,488
|
3,599,057
|
| Fair Value, Under 1 year |
0
|
0
|
| Fair Value, 1-5 years |
0
|
0
|
| Fair Value, 6-10 years |
23,674
|
22,549
|
| Fair Value, Over 10 years |
3,223,650
|
3,506,018
|
| Held-to-maturity Securities, Fair Value |
3,247,324
|
3,528,567
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
3,274,488
|
3,599,057
|
| Held-to-maturity Securities, Gross Gain |
(14,648)
|
(5,573)
|
| Held-to-maturity Securities, Gross Losses |
41,812
|
76,063
|
| Held-to-maturity securities, fair value |
3,247,324
|
3,528,567
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
1,504,885
|
2,849,198
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(16,953)
|
(73,711)
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
668,968
|
22,548
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
(24,859)
|
(2,352)
|
| Total Temporarily Impaired Securities, Fair Value |
2,173,853
|
2,871,746
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(41,812)
|
(76,063)
|
|
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 |
54,766
|
38,588
|
| Held-to-maturity Securities, Over 10 years |
158,851
|
189,999
|
| Held-to-maturity securities, Total |
213,617
|
228,587
|
| Fair Value, Under 1 year |
0
|
0
|
| Fair Value, 1-5 years |
0
|
0
|
| Fair Value, 6-10 years |
55,186
|
39,075
|
| Fair Value, Over 10 years |
156,696
|
185,097
|
| Held-to-maturity Securities, Fair Value |
211,882
|
224,172
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
213,617
|
228,587
|
| Held-to-maturity Securities, Gross Gain |
(755)
|
(776)
|
| Held-to-maturity Securities, Gross Losses |
(2,490)
|
(5,191)
|
| Held-to-maturity securities, fair value |
211,882
|
224,172
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
37,380
|
144,417
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(146)
|
(5,191)
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
71,374
|
0
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
(2,344)
|
0
|
| Total Temporarily Impaired Securities, Fair Value |
108,754
|
144,417
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(2,490)
|
(5,191)
|
|
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 |
8,388
|
9,023
|
| Held-to-maturity securities, Total |
8,388
|
9,023
|
| 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 |
7,850
|
8,159
|
| Held-to-maturity Securities, Fair Value |
7,850
|
8,159
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
8,388
|
9,023
|
| Held-to-maturity Securities, Gross Gain |
0
|
0
|
| Held-to-maturity Securities, Gross Losses |
(538)
|
(864)
|
| Held-to-maturity securities, fair value |
7,850
|
8,159
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
7,849
|
8,159
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(538)
|
(864)
|
| 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 |
7,849
|
8,159
|
| Total Temporarily Impaired Securities, Unrealized Losses |
(538)
|
(864)
|
|
Total U.S. Government backed agencies [Member]
|
|
|
| Contractual maturities of held-to-maturity securities |
|
|
| Held-to-maturity securities, Total |
3,488,105
|
3,827,644
|
| Held-to-maturity Securities, Fair Value |
3,459,206
|
3,752,739
|
| Amortized cost, gross unrealized gains and losses, and fair value by investment category |
|
|
| Held-to-maturity securities, Total |
3,488,105
|
3,827,644
|
| Held-to-maturity Securities, Gross Gain |
(15,403)
|
(6,349)
|
| Held-to-maturity Securities, Gross Losses |
44,302
|
81,254
|
| Held-to-maturity securities, fair value |
3,459,206
|
3,752,739
|
| Continuous Unrealized Loss Position |
|
|
| Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value |
1,542,265
|
2,993,615
|
| Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value |
(17,099)
|
(78,902)
|
| Total Temporarily Impaired Securities, Over Twelve Months, Fair Value |
740,342
|
22,548
|
| Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months |
(27,203)
|
(2,352)
|
| Total Temporarily Impaired Securities, Fair Value |
2,282,607
|
3,016,163
|
| Total Temporarily Impaired Securities, Unrealized Losses |
$ (44,302)
|
$ (81,254)
|