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Investment Securities (Details 4) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Available-for-sale securities     
Fair Value, Less than 12 months$ 842,886,000$ 95,233,000$ 842,886,000$ 95,233,000$ 1,464,928,000
Estimated Unrealized Loss, Less than 12 months3,905,000471,0003,905,000471,00019,187,000
Fair Value, 12 months or greater48,557,000112,668,00048,557,000112,668,00076,678,000
Estimated Unrealized Loss, 12 months or greater18,375,00024,249,00018,375,00024,249,00018,662,000
Fair Value, Total891,443,000207,901,000891,443,000207,901,0001,541,606,000
Estimated Unrealized Loss, Total22,280,00024,720,00022,280,00024,720,00037,849,000
Fair value of total securities available-for-sale7,185,288,0005,397,870,0007,185,288,0005,397,870,0005,720,675,000
Temporarily impaired securities881,700,000156,100,000881,700,000156,100,0001,510,000,000
Fair value securities, having non-credit impairment recognized in AOCI9,700,00051,800,0009,700,00051,800,00027,400,000
Impairment losses recognized in earnings on other-than-temporarily impaired securities193,000152,000651,0001,661,000 
U.S. Treasury
     
Available-for-sale securities     
Fair Value, Less than 12 months4,152,000 4,152,000 5,028,000
Estimated Unrealized Loss, Less than 12 months15,000 15,000 4,000
Fair Value, Total4,152,000 4,152,000 5,028,000
Estimated Unrealized Loss, Total15,000 15,000 4,000
Fair value of total securities available-for-sale19,213,00019,117,00019,213,00019,117,00014,113,000
Number of securities in the unrealized loss position2 2 1
Federal agency - Debt
     
Available-for-sale securities     
Fair Value, Less than 12 months396,326,000 396,326,000 561,205,000
Estimated Unrealized Loss, Less than 12 months477,000 477,000 5,221,000
Fair Value, Total396,326,000 396,326,000 561,205,000
Estimated Unrealized Loss, Total477,000 477,000 5,221,000
Fair value of total securities available-for-sale1,903,688,0001,311,936,0001,903,688,0001,311,936,0001,142,328,000
Number of securities in the unrealized loss position10 10 22
Federal agency - MBS
     
Available-for-sale securities     
Fair Value, Less than 12 months    109,381,000
Estimated Unrealized Loss, Less than 12 months    2,801,000
Fair Value, Total    109,381,000
Estimated Unrealized Loss, Total    2,801,000
Fair value of total securities available-for-sale541,225,000508,508,000541,225,000508,508,000551,346,000
Number of securities in the unrealized loss position21217
CMOs - Federal agency
     
Available-for-sale securities     
Fair Value, Less than 12 months398,499,00072,944,000398,499,00072,944,000755,751,000
Estimated Unrealized Loss, Less than 12 months1,872,00094,0001,872,00094,00010,585,000
Fair Value, Total398,499,00072,944,000398,499,00072,944,000755,751,000
Estimated Unrealized Loss, Total1,872,00094,0001,872,00094,00010,585,000
Fair value of total securities available-for-sale4,227,653,0002,923,601,0004,227,653,0002,923,601,0003,497,147,000
Number of securities in the unrealized loss position21421430
CMOs - Non-agency
     
Available-for-sale securities     
Fair Value, Less than 12 months21,660,00021,746,00021,660,00021,746,0007,718,000
Estimated Unrealized Loss, Less than 12 months916,000375,000916,000375,00018,000
Fair Value, 12 months or greater33,390,00098,581,00033,390,00098,581,00061,571,000
Estimated Unrealized Loss, 12 months or greater9,611,00014,137,0009,611,00014,137,0009,653,000
Fair Value, Total55,050,000120,327,00055,050,000120,327,00069,289,000
Estimated Unrealized Loss, Total10,527,00014,512,00010,527,00014,512,0009,671,000
Fair value of total securities available-for-sale76,430,000205,320,00076,430,000205,320,000118,295,000
Number of securities in the unrealized loss position1116111612
Impairment losses recognized in earnings on other-than-temporarily impaired securities193,000152,000651,0001,368,000 
Variable rate Non-agency CMOs
     
Available-for-sale securities     
Fair value of total securities available-for-sale44,100,000 44,100,000  
Other-than-temporarily impaired securities9,700,000 9,700,000  
Fixed rate Non-Agency CMOs
     
Available-for-sale securities     
Fair value of total securities available-for-sale32,300,000 32,300,000  
State and municipal
     
Available-for-sale securities     
Fair Value, Less than 12 months17,660,000543,00017,660,000543,00025,845,000
Estimated Unrealized Loss, Less than 12 months241,0002,000241,0002,000558,000
Fair Value, 12 months or greater678,000729,000678,000729,000700,000
Estimated Unrealized Loss, 12 months or greater104,00021,000104,00021,00057,000
Fair Value, Total18,338,0001,272,00018,338,0001,272,00026,545,000
Estimated Unrealized Loss, Total345,00023,000345,00023,000615,000
Fair value of total securities available-for-sale373,632,000360,471,000373,632,000360,471,000343,380,000
Number of securities in the unrealized loss position19219236
Other debt securities
     
Available-for-sale securities     
Fair Value, Less than 12 months4,589,000 4,589,000  
Estimated Unrealized Loss, Less than 12 months384,000 384,000  
Fair Value, 12 months or greater14,489,00013,358,00014,489,00013,358,00014,407,000
Estimated Unrealized Loss, 12 months or greater8,660,00010,091,0008,660,00010,091,0008,952,000
Fair Value, Total19,078,00013,358,00019,078,00013,358,00014,407,000
Estimated Unrealized Loss, Total9,044,00010,091,0009,044,00010,091,0008,952,000
Fair value of total securities available-for-sale41,632,00058,890,00041,632,00058,890,00043,630,000
Number of securities in the unrealized loss position21211
Collateralized debt obligations
     
Available-for-sale securities     
Estimated Unrealized Loss, Total8,600,000 8,600,000  
Total debt securities
     
Available-for-sale securities     
Fair value of total securities available-for-sale$ 7,183,473,000$ 5,387,843,000$ 7,183,473,000$ 5,387,843,000$ 5,710,239,000
Number of securities in the unrealized loss position67246724109