Available-for-Sale and Other Securities (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Investment maturity date range
Fair Value, Total	$ 231,919	$ 284,608
Total investment securities, Amortized Cost	1,084,770
Available-for-sale and other securities	8,713,530	9,895,244	9,723,558
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	1,084,770
Total investment securities, Unrealized Gross Losses	158,647	250,259	173,869
Available-for-sale and other securities	8,713,530	9,895,244	9,723,558
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	1,258,295	3,765,508	467,243
Total temporarily impaired securities, less than 12 months, Unrealized Losses	10,646	96,723	1,424
Total temporarily impaired securities, over 12 months, Fair Value	205,464	282,172	356,954
Total temporarily impaired securities, over 12 months, Unrealized Losses	148,001	153,536	172,445
Total temporarily impaired securities, Fair Value	1,463,759	4,047,680	824,197
Total investment securities, Unrealized Gross Losses	158,647	250,259	173,869
Automobile Asset Backed securities [Member]
Investment maturity date range
Amortized Cost, Under 1 year	0	19,669	40,000
Fair Value, Under 1 year	0	19,694	40,115
Amortized Cost, 1-5 years	631,103	697,001	657,980
Fair Value, 1-5 years	635,556	700,749	664,940
Amortized Cost, 6-10 years	165,722	323,411	273,246
Fair Value, 6-10 years	167,483	323,995	274,611
Amortized Cost, Over 10 years	287,945	301,326	349,527
Fair Value, Over 10 years	153,019	162,684	197,958
Amortized Cost, Total	1,084,770	1,341,407	1,320,753
Fair Value, Total	956,058	1,207,122	1,177,624
Total investment securities, Amortized Cost		1,341,407	1,320,753
Available-for-sale and other securities	956,058	1,207,122	1,177,624
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost		1,341,407	1,320,753
Total investment securities, Unrealized Gross Gains	6,306	6,563	8,928
Total investment securities, Unrealized Gross Losses	135,018	140,848	152,057
Available-for-sale and other securities	956,058	1,207,122	1,177,624
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	92,200	214,983	79,753
Total temporarily impaired securities, less than 12 months, Unrealized Losses	93	2,129	391
Total temporarily impaired securities, over 12 months, Fair Value	143,709	146,866	179,729
Total temporarily impaired securities, over 12 months, Unrealized Losses	134,925	138,719	151,666
Total temporarily impaired securities, Fair Value	235,909	361,849	259,482
Total investment securities, Unrealized Gross Losses	135,018	140,848	152,057
Federal agencies - mortgage backed securities [Member]
Investment maturity date range
Amortized Cost, Under 1 year	0	0	0
Fair Value, Under 1 year	0	0	0
Amortized Cost, 1-5 years	227,117	0	0
Fair Value, 1-5 years	227,885	0	0
Amortized Cost, 6-10 years	406,019	656,176	715,725
Fair Value, 6-10 years	416,966	664,793	731,869
Amortized Cost, Over 10 years	3,699,665	4,077,655	3,825,377
Fair Value, Over 10 years	3,790,395	4,089,611	3,951,671
Total investment securities, Amortized Cost	4,332,801	4,733,831	4,541,102
Available-for-sale and other securities	4,435,246	4,754,404	4,683,540
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	4,332,801	4,733,831	4,541,102
Total investment securities, Unrealized Gross Gains	104,884	71,901	142,537
Total investment securities, Unrealized Gross Losses	2,439	51,328	99
Available-for-sale and other securities	4,435,246	4,754,404	4,683,540
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	386,727	1,424,431	49,491
Total temporarily impaired securities, less than 12 months, Unrealized Losses	2,439	51,328	99
Total temporarily impaired securities, over 12 months, Fair Value	0	0	0
Total temporarily impaired securities, over 12 months, Unrealized Losses	0	0	0
Total temporarily impaired securities, Fair Value	386,727	1,424,431	49,491
Total investment securities, Unrealized Gross Losses	2,439	51,328	99
Federal agencies - mortgage backed securities [Member] \| Total U.S. Government backed agencies [Member]
Investment maturity date range
Amortized Cost, Total	4,332,801	4,733,831	4,541,102
Fair Value, Total	4,435,246	4,754,404	4,683,540
TLGP securities [Member]
Investment maturity date range
Amortized Cost, Under 1 year	105,267	156,450	50,148
Fair Value, Under 1 year	105,537	157,931	50,564
Amortized Cost, 1-5 years	0	25,230	527,581
Fair Value, 1-5 years	0	25,536	530,350
Amortized Cost, 6-10 years	0	0	0
Fair Value, 6-10 years	0	0	0
Amortized Cost, Over 10 years	0	0	0
Fair Value, Over 10 years	0	0	0
Amortized Cost, Total	105,267	181,680	577,729
Fair Value, Total	105,537	183,467	580,914
Total investment securities, Amortized Cost	105,267	181,680	577,729
Available-for-sale and other securities	105,537	183,467	580,914
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	105,267	181,680	577,729
Total investment securities, Unrealized Gross Gains	270	1,787	3,185
Total investment securities, Unrealized Gross Losses	0	0	0
Available-for-sale and other securities	105,537	183,467	580,914
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	0	0	0
Total temporarily impaired securities, less than 12 months, Unrealized Losses	0	0	0
Total temporarily impaired securities, over 12 months, Fair Value	0	0	0
Total temporarily impaired securities, over 12 months, Unrealized Losses	0	0	0
Total temporarily impaired securities, Fair Value	0	0	0
Total investment securities, Unrealized Gross Losses	0	0	0
Private label CMO [Member]
Investment maturity date range
Amortized Cost, Under 1 year	0	0	0
Fair Value, Under 1 year	0	0	0
Amortized Cost, 1-5 years	0	0	0
Fair Value, 1-5 years	0	0	0
Amortized Cost, 6-10 years	12,791	10,429	13,004
Fair Value, 6-10 years	12,883	10,887	13,424
Amortized Cost, Over 10 years	77,618	124,080	282,639
Fair Value, Over 10 years	66,017	111,038	262,800
Amortized Cost, Total	90,409	134,509	295,643
Fair Value, Total	78,900	121,925	276,224
Total investment securities, Amortized Cost	90,409	134,509	295,643
Available-for-sale and other securities	78,900	121,925	276,224
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	90,409	134,509	295,643
Total investment securities, Unrealized Gross Gains	745	1,236	1,177
Total investment securities, Unrealized Gross Losses	12,254	13,820	20,596
Available-for-sale and other securities	78,900	121,925	276,224
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	13,309	0	0
Total temporarily impaired securities, less than 12 months, Unrealized Losses	86	0	0
Total temporarily impaired securities, over 12 months, Fair Value	53,934	85,617	172,450
Total temporarily impaired securities, over 12 months, Unrealized Losses	12,168	13,820	20,596
Total temporarily impaired securities, Fair Value	67,243	85,617	172,450
Total investment securities, Unrealized Gross Losses	12,254	13,820	20,596
Other Federal Agencies [Member]
Investment maturity date range
Amortized Cost, Under 1 year	101,509	158,273	114,396
Fair Value, Under 1 year	102,056	159,288	115,200
Amortized Cost, 1-5 years	1,012,874	1,898,867	1,890,250
Fair Value, 1-5 years	1,022,914	1,885,230	1,903,181
Amortized Cost, 6-10 years	12,138	13,082	13,232
Fair Value, 6-10 years	12,984	13,359	13,794
Amortized Cost, Over 10 years	0	500	0
Fair Value, Over 10 years	0	499	0
Amortized Cost, Total	1,126,521	2,070,722	2,017,878
Fair Value, Total	1,137,954	2,058,376	2,032,175
Total investment securities, Amortized Cost	1,126,521	2,070,722	2,017,878
Available-for-sale and other securities	1,137,954	2,058,376	2,032,175
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	1,126,521	2,070,722	2,017,878
Total investment securities, Unrealized Gross Gains	11,505	4,874	14,420
Total investment securities, Unrealized Gross Losses	72	17,220	123
Available-for-sale and other securities	1,137,954	2,058,376	2,032,175
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	151,404	1,217,074	249,879
Total temporarily impaired securities, less than 12 months, Unrealized Losses	67	17,134	121
Total temporarily impaired securities, over 12 months, Fair Value	1,902	4,771	502
Total temporarily impaired securities, over 12 months, Unrealized Losses	5	86	2
Total temporarily impaired securities, Fair Value	153,306	1,221,845	250,381
Total investment securities, Unrealized Gross Losses	72	17,220	123
Municipal securities [Member]
Investment maturity date range
Amortized Cost, Under 1 year	855	0	0
Fair Value, Under 1 year	855	0	0
Amortized Cost, 1-5 years	182,875	149,151	61,488
Fair Value, 1-5 years	186,856	148,587	63,329
Amortized Cost, 6-10 years	105,874	124,552	67,297
Fair Value, 6-10 years	110,165	125,656	70,466
Amortized Cost, Over 10 years	112,787	182,341	230,485
Fair Value, Over 10 years	115,513	181,472	234,077
Amortized Cost, Total	402,391	456,044	359,270
Fair Value, Total	413,389	455,715	367,872
Total investment securities, Amortized Cost	402,391	456,044	359,270
Available-for-sale and other securities	413,389	455,715	367,872
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	402,391	456,044	359,270
Total investment securities, Unrealized Gross Gains	11,023	6,154	8,776
Total investment securities, Unrealized Gross Losses	25	6,483	174
Available-for-sale and other securities	413,389	455,715	367,872
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	3,508	201,370	23,621
Total temporarily impaired securities, less than 12 months, Unrealized Losses	6	6,363	168
Total temporarily impaired securities, over 12 months, Fair Value	3,801	3,700	3,814
Total temporarily impaired securities, over 12 months, Unrealized Losses	19	120	6
Total temporarily impaired securities, Fair Value	7,309	205,070	27,435
Total investment securities, Unrealized Gross Losses	25	6,483	174
Covered Bonds [Member]
Investment maturity date range
Amortized Cost, Under 1 year	0	0	0
Fair Value, Under 1 year	0	0	0
Amortized Cost, 1-5 years	698,671	379,711	150,391
Fair Value, 1-5 years	703,630	367,209	151,310
Amortized Cost, 6-10 years	0	0	0
Fair Value, 6-10 years	0	0	0
Amortized Cost, Over 10 years	0	0	0
Fair Value, Over 10 years	0	0	0
Amortized Cost, Total	698,671	379,711	150,391
Fair Value, Total	703,630	367,209	151,310
Total investment securities, Amortized Cost	698,671	379,711	150,391
Available-for-sale and other securities	703,630	367,209	151,310
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	698,671	379,711	150,391
Total investment securities, Unrealized Gross Gains	8,203	0	929
Total investment securities, Unrealized Gross Losses	3,244	12,502	10
Available-for-sale and other securities	703,630	367,209	151,310
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	214,939	367,209	25,335
Total temporarily impaired securities, less than 12 months, Unrealized Losses	3,244	12,502	10
Total temporarily impaired securities, over 12 months, Fair Value	0	0	0
Total temporarily impaired securities, over 12 months, Unrealized Losses	0	0	0
Total temporarily impaired securities, Fair Value	214,939	367,209	25,335
Total investment securities, Unrealized Gross Losses	3,244	12,502	10
Corporate debt [Member]
Investment maturity date range
Amortized Cost, Under 1 year	0	0	0
Fair Value, Under 1 year	0	0	0
Amortized Cost, 1-5 years	459,098	329,988	30,000
Fair Value, 1-5 years	454,852	323,389	30,154
Amortized Cost, 6-10 years	0	0	0
Fair Value, 6-10 years	0	0	0
Amortized Cost, Over 10 years	0	0	0
Fair Value, Over 10 years	0	0	0
Amortized Cost, Total	459,098	329,988	30,000
Fair Value, Total	454,852	323,389	30,154
Total investment securities, Amortized Cost	459,098	329,988	30,000
Available-for-sale and other securities	454,852	323,389	30,154
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	459,098	329,988	30,000
Total investment securities, Unrealized Gross Gains	347	24	154
Total investment securities, Unrealized Gross Losses	4,593	6,623	0
Available-for-sale and other securities	454,852	323,389	30,154
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	394,000	288,660	0
Total temporarily impaired securities, less than 12 months, Unrealized Losses	4,593	6,623	0
Total temporarily impaired securities, over 12 months, Fair Value	0	0	0
Total temporarily impaired securities, over 12 months, Unrealized Losses	0	0	0
Total temporarily impaired securities, Fair Value	394,000	288,660	0
Total investment securities, Unrealized Gross Losses	4,593	6,623	0
Other Securities [Member]
Investment maturity date range
Amortized Cost, Under 1 year	750	800	300
Fair Value, Under 1 year	750	802	305
Amortized Cost, 1-5 years	8,216	7,810	7,486
Fair Value, 1-5 years	8,411	8,009	7,715
Amortized Cost, 6-10 years	912	1,007	1,205
Fair Value, 6-10 years	966	1,037	1,336
Amortized Cost, Over 10 years	0	0	0
Fair Value, Over 10 years	0	0	0
Amortized Cost, Total	375,197	372,283	373,782
Fair Value, Total	374,643	371,856	373,411
Non-marketable equity securities, Amortized Cost Non-marketable equity securities, Amortized Cost	310,280	308,722	310,142
Marketable equity securities, Amortized Cost	55,039	53,944	54,649
Total investment securities, Amortized Cost	375,197	372,283	373,782
Non-marketable equity securities, Fair Value	310,280	308,722	310,142
Marketable equity securities, fair value	54,236	53,286	53,913
Available-for-sale and other securities	374,643	371,856	373,411
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	375,197	372,283	373,782
Total investment securities, Unrealized Gross Gains	448	364	439
Total investment securities, Unrealized Gross Losses	1,002	791	810
Available-for-sale and other securities	374,643	371,856	373,411
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	2,208	0	39,164
Total temporarily impaired securities, less than 12 months, Unrealized Losses	118	0	635
Total temporarily impaired securities, over 12 months, Fair Value	2,118	41,218	459
Total temporarily impaired securities, over 12 months, Unrealized Losses	884	791	175
Total temporarily impaired securities, Fair Value	4,326	41,218	39,623
Total investment securities, Unrealized Gross Losses	1,002	791	810
U.S. Treasury [Member]
Investment maturity date range
Amortized Cost, Under 1 year	0	0	49,998
Fair Value, Under 1 year	0	0	50,334
Amortized Cost, 1-5 years	51,939	52,425	0
Fair Value, 1-5 years	52,793	51,781	0
Amortized Cost, 6-10 years	510	0	0
Fair Value, 6-10 years	528	0	0
Amortized Cost, Over 10 years	0	0	0
Fair Value, Over 10 years	0	0	0
Amortized Cost, Total	52,449	52,425	49,998
Fair Value, Total	53,321	51,781	50,334
Total investment securities, Amortized Cost	52,449	52,425	49,998
Available-for-sale and other securities	53,321	51,781	50,334
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	52,449	52,425	49,998
Total investment securities, Unrealized Gross Gains	872	0	336
Total investment securities, Unrealized Gross Losses	0	644	0
Available-for-sale and other securities	53,321	51,781	50,334
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	0	51,781	0
Total temporarily impaired securities, less than 12 months, Unrealized Losses	0	644	0
Total temporarily impaired securities, over 12 months, Fair Value	0	0	0
Total temporarily impaired securities, over 12 months, Unrealized Losses	0	0	0
Total temporarily impaired securities, Fair Value	0	51,781	0
Total investment securities, Unrealized Gross Losses	0	644	0
Total U.S. Government backed agencies [Member]
Investment maturity date range
Amortized Cost, Total	5,617,038	7,038,658	7,186,707
Fair Value, Total	5,732,058	7,048,028	7,346,963
Total investment securities, Amortized Cost	5,617,038	7,038,658	7,186,707
Available-for-sale and other securities	5,732,058	7,048,028	7,346,963
Amortized cost, fair value, and gross unrealized gains and losses recognized in accumulated other comprehensive income
Total investment securities, Amortized Cost	5,617,038	7,038,658	7,186,707
Total investment securities, Unrealized Gross Gains	117,531	78,562	160,478
Total investment securities, Unrealized Gross Losses	2,511	69,192	222
Available-for-sale and other securities	5,732,058	7,048,028	7,346,963
Investment securities in unrealized loss position
Total temporarily impaired securities, less than 12 months, Fair value	538,131	2,693,286	299,370
Total temporarily impaired securities, less than 12 months, Unrealized Losses	2,506	69,106	220
Total temporarily impaired securities, over 12 months, Fair Value	1,902	4,771	502
Total temporarily impaired securities, over 12 months, Unrealized Losses	5	86	2
Total temporarily impaired securities, Fair Value	540,033	2,698,057	299,872
Total investment securities, Unrealized Gross Losses	$ 2,511	$ 69,192	$ 222

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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