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Business Segments - Selected Business Segment Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business segment financial information      
Net Interest Income $ 497,290 $ 496,322 $ 497,715
Provision for Credit Losses (50,500) 117,800 16,000
Net Interest Income (Loss) After Provision for Credit Losses 547,790 378,522 481,715
Noninterest Income 171,353 184,409 183,338
Noninterest Expense (393,589) (373,807) (379,227)
Income (Loss) Before Provision for Income Taxes 325,554 189,124 285,826
Provision for Income Taxes (72,182) (35,320) (59,913)
Net Income 253,372 153,804 225,913
Total Assets 22,784,941 20,603,651 18,095,496
Consumer Banking      
Business segment financial information      
Net Interest Income 283,998 292,710 305,803
Provision for Credit Losses 5,764 8,087 11,685
Net Interest Income (Loss) After Provision for Credit Losses 278,234 284,623 294,118
Noninterest Income 131,292 128,400 142,378
Noninterest Expense (303,699) (289,177) (281,662)
Income (Loss) Before Provision for Income Taxes 105,827 123,846 154,834
Provision for Income Taxes (26,442) (31,476) (38,654)
Net Income 79,385 92,370 116,180
Total Assets 7,675,823 7,478,813 7,054,511
Commercial Banking      
Business segment financial information      
Net Interest Income 194,409 188,626 185,259
Provision for Credit Losses 201 (948) 976
Net Interest Income (Loss) After Provision for Credit Losses 194,208 189,574 184,283
Noninterest Income 30,637 34,523 33,362
Noninterest Expense (64,470) (63,294) (84,616)
Income (Loss) Before Provision for Income Taxes 160,375 160,803 133,029
Provision for Income Taxes (39,070) (40,081) (28,852)
Net Income 121,305 120,722 104,177
Total Assets 5,107,001 5,116,807 4,254,261
Treasury and Other      
Business segment financial information      
Net Interest Income 18,883 14,986 6,653
Provision for Credit Losses (56,465) 110,661 3,339
Net Interest Income (Loss) After Provision for Credit Losses 75,348 (95,675) 3,314
Noninterest Income 9,424 21,486 7,598
Noninterest Expense (25,420) (21,336) (12,949)
Income (Loss) Before Provision for Income Taxes 59,352 (95,525) (2,037)
Provision for Income Taxes (6,670) 36,237 7,593
Net Income 52,682 (59,288) 5,556
Total Assets $ 10,002,117 $ 8,008,031 $ 6,786,724