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Quarterly Financial Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 268,453 | $ 275,749 | $ 265,851 | $ 257,883 | $ 256,095 | $ 248,110 | $ 230,984 | $ 211,528 | $ 208,085 | $ 202,167 | $ 123,743 | $ 102,143 | $ 1,067,936 | $ 946,717 | $ 636,138
Net interest income | 194,172 | 195,806 | 188,918 | 187,246 | 190,215 | 189,420 | 182,236 | 174,471 | 174,731 | 173,182 | 106,627 | 88,767 | 738,859 | 701,965 | 519,642
Provision for loan losses | 4,644 | 8,260 | 7,195 | 7,184 | 9,319 | 8,725 | 9,402 | 6,931 | 6,281 | 6,920 | 6,812 | 3,651 | 27,283 | 34,377 | 23,664
Net income before taxes | 118,520 | 137,224 | 124,719 | 117,074 | 118,757 | 118,183 | 109,865 | 103,143 | 81,965 | 99,503 | 63,074 | 53,444 | 497,537 | 449,948 | 297,986
Net income | $ 96,079 | $ 110,521 | $ 100,321 | $ 93,960 | $ 95,318 | $ 93,747 | $ 86,865 | $ 83,510 | $ 26,798 | $ 64,442 | $ 43,086 | $ 39,653 | $ 400,881 | $ 359,440 | $ 173,979
Basic net income per common share (in dollars per share) | $ 1.26 | $ 1.45 | $ 1.31 | $ 1.22 | $ 1.24 | $ 1.22 | $ 1.13 | $ 1.08 | $ 0.35 | $ 0.84 | $ 0.81 | $ 0.83 | $ 5.25 | $ 4.66 | $ 2.73
Diluted net income per common share (in dollars per share) | $ 1.26 | $ 1.44 | $ 1.31 | $ 1.22 | $ 1.23 | $ 1.21 | $ 1.12 | $ 1.08 | $ 0.35 | $ 0.83 | $ 0.80 | $ 0.82 | $ 5.22 | $ 4.64 | $ 2.70

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