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Segment Information - Information about Company's Segments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Net interest income $ 2,842,587 $ 2,676,446 $ 2,673,229
Noninterest income 1,825,037 1,779,273 1,865,205
Total income 4,667,624 4,455,719 4,538,434
Provision for credit losses 170,000 124,000 185,000
Amortization of core deposit and other intangible assets 26,424 33,824 46,912
Depreciation and other amortization 148,925 164,906 156,823
Other noninterest expense 2,647,583 2,490,744 2,384,131
Income (loss) before taxes 1,674,692 1,642,245 1,765,568
Income tax expense (benefit) 595,025 575,999 627,088
Net income (loss) 1,079,667 1,066,246 1,138,480
Average total assets 101,780,000 92,143,000 83,662,000
Capital expenditures 82,000 73,000 130,000
All Other [Member]      
Segment Reporting Information [Line Items]      
Net interest income 105,143 (21,543) (183,361)
Noninterest income 594,586 599,870 672,576
Total income 699,729 578,327 489,215
Provision for credit losses 62,074 (12,954) (3,679)
Amortization of core deposit and other intangible assets 26,424 33,824 46,912
Depreciation and other amortization 64,852 61,848 57,120
Other noninterest expense 959,345 854,883 713,873
Income (loss) before taxes (412,966) (359,274) (325,011)
Income tax expense (benefit) (213,682) (201,119) (180,238)
Net income (loss) (199,284) (158,155) (144,773)
Average total assets 12,870,000 12,277,000 9,262,000
Capital expenditures 68,000 57,000 89,000
Residential Mortgage Banking [Member]      
Segment Reporting Information [Line Items]      
Net income (loss)   84,542 92,323
Residential Mortgage Banking [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net interest income 63,939 67,482 83,574
Noninterest income 336,099 331,366 325,454
Total income 400,038 398,848 409,028
Provision for credit losses (5,225) (1,508) (10,906)
Depreciation and other amortization 27,883 47,086 48,698
Other noninterest expense 233,651 216,556 221,984
Income (loss) before taxes 143,729 136,714 149,252
Income tax expense (benefit) 55,151 52,172 56,929
Net income (loss) 88,578 84,542 92,323
Average total assets 2,918,000 3,076,000 2,651,000
Retail Banking [Member]      
Segment Reporting Information [Line Items]      
Net income (loss)   273,358 320,950
Retail Banking [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net interest income 917,041 908,828 962,214
Noninterest income 324,953 336,042 373,628
Total income 1,241,994 1,244,870 1,335,842
Provision for credit losses 72,953 77,158 72,502
Depreciation and other amortization 35,291 37,788 34,599
Other noninterest expense 682,594 668,919 687,275
Income (loss) before taxes 451,156 461,005 541,466
Income tax expense (benefit) 183,638 187,647 220,516
Net income (loss) 267,518 273,358 320,950
Average total assets 11,035,000 10,449,000 10,997,000
Capital expenditures 14,000 14,000 40,000
Business Banking [Member]      
Segment Reporting Information [Line Items]      
Net income (loss)   99,270 101,065
Business Banking [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net interest income 338,855 345,773 365,786
Noninterest income 108,195 105,149 102,613
Total income 447,050 450,922 468,399
Provision for credit losses 15,513 18,883 26,550
Depreciation and other amortization 407 405 198
Other noninterest expense 264,163 263,734 270,759
Income (loss) before taxes 166,967 167,900 170,892
Income tax expense (benefit) 68,209 68,630 69,827
Net income (loss) 98,758 99,270 101,065
Average total assets 5,339,000 5,278,000 5,107,000
Capital expenditures   2,000 1,000
Commercial Banking [Member]      
Segment Reporting Information [Line Items]      
Net income (loss)   402,928 407,393
Commercial Banking [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net interest income 753,604 746,344 785,987
Noninterest income 290,142 254,295 263,925
Total income 1,043,746 1,000,639 1,049,912
Provision for credit losses 25,089 33,213 76,791
Depreciation and other amortization 566 588 564
Other noninterest expense 288,303 284,091 289,582
Income (loss) before taxes 729,788 682,747 682,975
Income tax expense (benefit) 298,758 279,819 275,582
Net income (loss) 431,030 402,928 407,393
Average total assets 24,143,000 22,860,000 21,710,000
Commercial Real Estate [Member]      
Segment Reporting Information [Line Items]      
Net income (loss)   315,960 329,286
Commercial Real Estate [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net interest income 577,922 555,358 590,009
Noninterest income 142,948 125,087 130,833
Total income 720,870 680,445 720,842
Provision for credit losses (8,003) (7,339) 6,613
Depreciation and other amortization 19,247 16,300 14,314
Other noninterest expense 169,688 169,039 173,345
Income (loss) before taxes 539,938 502,445 526,570
Income tax expense (benefit) 199,297 186,485 197,284
Net income (loss) 340,641 315,960 329,286
Average total assets 18,827,000 17,405,000 17,305,000
Discretionary Portfolio [Member]      
Segment Reporting Information [Line Items]      
Net income (loss)   48,343 32,236
Discretionary Portfolio [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net interest income 86,083 74,204 69,020
Noninterest income 28,114 27,464 (3,824)
Total income 114,197 101,668 65,196
Provision for credit losses 7,599 16,547 17,129
Depreciation and other amortization 679 891 1,330
Other noninterest expense 49,839 33,522 27,313
Income (loss) before taxes 56,080 50,708 19,424
Income tax expense (benefit) 3,654 2,365 (12,812)
Net income (loss) 52,426 48,343 32,236
Average total assets $ 26,648,000 $ 20,798,000 $ 16,630,000