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Quarterly Financial Results (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Consolidated Quarterly Financial Data | A summary of selected consolidated quarterly financial data for each of the years in the three-year period ended December 31, 2020 follows:
(in thousands, except per share data) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2020 |  |  |  |  |  |  |
Interest income | $ | 263,069 |  |  | $ | 251,738 |  |  | $ | 249,188 |  |  | $ | 257,047 |
Net interest income | 193,552 |  |  | 200,657 |  |  | 206,594 |  |  | 220,985 |
Provision for credit losses | 99,889 |  |  | 68,332 |  |  | 16,333 |  |  | 7,180 |
Net income before taxes | 26,691 |  |  | 73,674 |  |  | 137,049 |  |  | 133,944 |
Net income | 28,356 |  |  | 62,444 |  |  | 110,645 |  |  | 110,876 |
Net income available to common shareholders | 28,356 |  |  | 62,444 |  |  | 106,847 |  |  | 107,078 |
Basic net income per share | $ | 0.37 |  |  | $ | 0.83 |  |  | $ | 1.42 |  |  | $ | 1.42 |
Diluted net income per share | $ | 0.37 |  |  | $ | 0.83 |  |  | $ | 1.42 |  |  | $ | 1.42 |
2019 |  |  |  |  |  |  |
Interest income | $ | 257,883 |  |  | $ | 265,851 |  |  | $ | 275,749 |  |  | $ | 268,453 |
Net interest income | 187,246 |  |  | 188,918 |  |  | 195,806 |  |  | 194,172 |
Provision for credit losses | 7,184 |  |  | 7,195 |  |  | 8,260 |  |  | 4,644 |
Net income before taxes | 117,074 |  |  | 124,719 |  |  | 137,224 |  |  | 118,520 |
Net income available to common shareholders | 93,960 |  |  | 100,321 |  |  | 110,521 |  |  | 96,079 |
Basic net income per share | $ | 1.22 |  |  | $ | 1.31 |  |  | $ | 1.45 |  |  | $ | 1.26 |
Diluted net income per share | $ | 1.22 |  |  | $ | 1.31 |  |  | $ | 1.44 |  |  | $ | 1.26 |
2018 |  |  |  |  |  |  |
Interest income | $ | 211,528 |  |  | $ | 230,984 |  |  | $ | 248,110 |  |  | $ | 256,095 |
Net interest income | 174,471 |  |  | 182,236 |  |  | 189,420 |  |  | 190,215 |
Provision for credit losses | 6,931 |  |  | 9,402 |  |  | 8,725 |  |  | 9,319 |
Net income before taxes | 103,143 |  |  | 109,865 |  |  | 118,183 |  |  | 118,757 |
Net income available to common shareholders | 83,510 |  |  | 86,865 |  |  | 93,747 |  |  | 95,318 |
Basic net income per share | $ | 1.08 |  |  | $ | 1.13 |  |  | $ | 1.22 |  |  | $ | 1.24 |
Diluted net income per share | $ | 1.08 |  |  | $ | 1.12 |  |  | $ | 1.21 |  |  | $ | 1.23 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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