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Business Segments - Selected Business Segment Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Business segment financial information      
Net Interest Income $ 497,025 $ 540,558 $ 497,290
Provision for Credit Losses 9,000 (7,800) (50,500)
Net Interest Income (Loss) After Provision for Credit Losses 488,025 548,358 547,790
Noninterest Income 176,609 157,541 171,353
Noninterest Expense (437,518) (415,265) (393,589)
Income (Loss) Before Provision for Income Taxes 227,116 290,634 325,554
Provision for Income Taxes (55,914) (64,830) (72,182)
Net Income (Loss) 171,202 225,804 253,372
Total Assets 23,733,296 23,606,877 22,784,941
Consumer Banking      
Business segment financial information      
Net Interest Income 400,380 327,445 283,998
Provision for Credit Losses 7,773 5,324 5,764
Net Interest Income (Loss) After Provision for Credit Losses 392,607 322,121 278,234
Noninterest Income 126,373 126,337 131,292
Noninterest Expense (340,336) (330,140) (303,698)
Income (Loss) Before Provision for Income Taxes 178,644 118,318 105,828
Provision for Income Taxes (46,003) (29,954) (26,442)
Net Income (Loss) 132,641 88,364 79,386
Total Assets 8,486,255 8,520,459 7,675,813
Commercial Banking      
Business segment financial information      
Net Interest Income 215,865 209,273 194,411
Provision for Credit Losses 44 (206) 201
Net Interest Income (Loss) After Provision for Credit Losses 215,821 209,479 194,210
Noninterest Income 33,016 25,938 30,637
Noninterest Expense (77,486) (70,601) (64,470)
Income (Loss) Before Provision for Income Taxes 171,351 164,816 160,377
Provision for Income Taxes (42,806) (40,659) (39,070)
Net Income (Loss) 128,545 124,157 121,307
Total Assets 5,831,880 5,522,916 5,107,001
Treasury and Other      
Business segment financial information      
Net Interest Income (119,220) 3,840 18,881
Provision for Credit Losses 1,183 (12,918) (56,465)
Net Interest Income (Loss) After Provision for Credit Losses (120,403) 16,758 75,346
Noninterest Income 17,220 5,266 9,424
Noninterest Expense (19,696) (14,524) (25,421)
Income (Loss) Before Provision for Income Taxes (122,879) 7,500 59,349
Provision for Income Taxes 32,895 5,783 (6,670)
Net Income (Loss) (89,984) 13,283 52,679
Total Assets $ 9,415,161 $ 9,563,502 $ 10,002,127