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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income | $ 359,765 | $ 339,910 | $ 322,775 | $ 302,669 | $ 302,127 | $ 280,317 | $ 278,865 | $ 276,172 | $ 1,325,119 | $ 1,137,481 | $ 1,053,815
Interest expense | 40,064 | 36,755 | 32,684 | 30,547 | 29,425 | 26,169 | 25,281 | 23,968 | 140,050 | 104,843 | 103,376
Net interest income before provision for credit losses | 319,701 | 303,155 | 290,091 | 272,122 | 272,702 | 254,148 | 253,584 | 252,204 | 1,185,069 | 1,032,638 | 950,439
Provision for credit losses | 15,517 | 12,996 | 10,685 | 7,068 | 10,461 | 9,525 | 6,053 | 1,440 | 46,266 | 27,479 | 14,217
Net interest income after provision for credit losses | 304,184 | 290,159 | 279,406 | 265,054 | 262,241 | 244,623 | 247,531 | 250,764 | 1,138,803 | 1,005,159 | 936,222
Noninterest income | 45,359 | 49,624 | 47,400 | 116,023 | 48,800 | 49,341 | 44,264 | 40,513 | 258,406 | 182,918 | 183,383
Noninterest expense | 175,416 | 164,499 | 169,121 | 153,073 | 149,904 | 170,500 | 148,879 | 146,606 | 662,109 | 615,889 | 540,884
Income before income taxes | 174,127 | 175,284 | 157,685 | 228,004 | 161,137 | 123,464 | 142,916 | 144,671 | 735,100 | 572,188 | 578,721
Income tax expense | 89,229 | 42,624 | 39,355 | 58,268 | 50,403 | 13,321 | 39,632 | 37,155 | 229,476 | 140,511 | 194,044
NET INCOME | $ 84,898 | $ 132,660 | $ 118,330 | $ 169,736 | $ 110,734 | $ 110,143 | $ 103,284 | $ 107,516 | $ 505,624 | $ 431,677 | $ 384,677
EPS |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.59 | $ 0.92 | $ 0.82 | $ 1.18 | $ 0.77 | $ 0.76 | $ 0.72 | $ 0.75 | $ 3.50 | $ 3.00 | $ 2.67
Diluted (in dollars per share) | $ 0.58 | $ 0.91 | $ 0.81 | $ 1.16 | $ 0.76 | $ 0.76 | $ 0.71 | $ 0.74 | $ 3.47 | $ 2.97 | $ 2.66
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 144,542 | 144,498 | 144,485 | 144,249 | 144,166 | 144,122 | 144,101 | 143,958 | 144,444 | 144,087 | 143,818
Diluted (in shares) | 146,030 | 145,882 | 145,740 | 145,732 | 145,428 | 145,238 | 145,078 | 144,803 | 145,913 | 145,172 | 144,512
Dividends declared per common share (in dollars per share) | $ 0.2 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.8 | $ 0.8 | $ 0.8

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