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Reportable Operating Segments - Selected Business Segment Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Selected business segment financial information |  |  |
Net interest income (expense) | $ 530,559 | $ 535,734 | $ 573,402
Benefit (Provision) for credit losses | 39,000 | (121,718) | (13,800)
Net interest income (expense) after benefit for credit losses | 569,559 | 414,016 | 559,602
Noninterest income | 184,916 | 197,380 | 192,533
Noninterest expense | (405,479) | (367,672) | (370,437)
Income before provision for income taxes | 348,996 | 243,724 | 381,698
Benefit for income taxes | (83,261) | (57,970) | (97,306)
Net income | 265,735 | 185,754 | 284,392
Total assets | 24,992,410 | 22,662,831 | 20,166,734
Retail Banking |  |  |
Selected business segment financial information |  |  |
Net interest income (expense) | 385,656 | 375,145 | 413,029
Benefit (Provision) for credit losses | 16,267 | (52,719) | (6,248)
Net interest income (expense) after benefit for credit losses | 401,923 | 322,426 | 406,781
Noninterest income | 91,672 | 98,026 | 95,413
Noninterest expense | (247,949) | (232,976) | (228,389)
Income before provision for income taxes | 245,646 | 187,476 | 273,805
Benefit for income taxes | (58,710) | (43,825) | (69,285)
Net income | 186,936 | 143,651 | 204,520
Total assets | 7,148,376 | 6,894,602 | 7,276,047
Commercial Banking |  |  |
Selected business segment financial information |  |  |
Net interest income (expense) | 162,997 | 151,622 | 141,227
Benefit (Provision) for credit losses | 22,452 | (53,921) | (7,552)
Net interest income (expense) after benefit for credit losses | 185,449 | 97,701 | 133,675
Noninterest income | 72,781 | 78,202 | 73,635
Noninterest expense | (100,932) | (79,961) | (82,380)
Income before provision for income taxes | 157,298 | 95,942 | 124,930
Benefit for income taxes | (37,525) | (21,951) | (32,298)
Net income | 119,773 | 73,991 | 92,632
Total assets | 5,972,567 | 6,526,863 | 6,071,356
Treasury and Other |  |  |
Selected business segment financial information |  |  |
Net interest income (expense) | (18,094) | 8,967 | 19,146
Benefit (Provision) for credit losses | 281 | (15,078) |
Net interest income (expense) after benefit for credit losses | (17,813) | (6,111) | 19,146
Noninterest income | 20,463 | 21,152 | 23,485
Noninterest expense | (56,598) | (54,735) | (59,668)
Income before provision for income taxes | (53,948) | (39,694) | (17,037)
Benefit for income taxes | 12,974 | 7,806 | 4,277
Net income | (40,974) | (31,888) | (12,760)
Total assets | $ 11,871,467 | $ 9,241,366 | $ 6,819,331

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