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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Total      
Total $ 23,862,574   $ 24,044,919
Current period gross charge-offs (20,034) $ (10,952)  
Real estate - commercial mortgage      
Total      
Total 9,676,517   9,601,858
Gross loans 9,676,517   9,601,858
Commercial and Industrial      
Total      
Total 4,531,266   4,605,589
Gross loans 4,531,266   4,605,589
Real estate - residential mortgage      
Total      
Total 6,409,657   6,349,643
Gross loans 6,409,657   6,349,643
Leases and other loans      
Total      
Total 301,914   315,458
Gross loans 301,914   315,458
Portfolio Segment and Loan Class      
2025      
Total 246,831   1,286,860
2024      
Total 1,309,992   2,032,639
2023      
Total 2,040,882   2,210,556
2022      
Total 2,127,582   1,976,780
2021      
Total 1,879,020   1,476,712
Prior      
Total 5,828,548   4,569,991
Revolving Loans Amortized Cost Basis      
Total 1,703,461   1,782,925
Total      
Total 15,151,381   15,383,443
Portfolio Segment and Loan Class | Pass      
2025      
Total 246,349   1,256,865
2024      
Total 1,265,573   1,879,088
2023      
Total 1,858,547   1,808,587
2022      
Total 1,776,845   1,615,041
2021      
Total 1,555,628   1,354,603
Prior      
Total 5,273,496   4,140,549
Revolving Loans Amortized Cost Basis      
Total 1,400,325   1,475,751
Total      
Total 13,380,245   13,547,095
Portfolio Segment and Loan Class | Special Mention      
2025      
Total 282   14,369
2024      
Total 24,831   92,293
2023      
Total 93,785   249,862
2022      
Total 205,638   245,540
2021      
Total 226,884   34,516
Prior      
Total 170,304   165,731
Revolving Loans Amortized Cost Basis      
Total 119,191   128,918
Total      
Total 843,494   931,542
Portfolio Segment and Loan Class | Substandard or Lower      
2025      
Total 200   15,626
2024      
Total 19,588   61,258
2023      
Total 88,550   152,107
2022      
Total 145,099   116,199
2021      
Total 96,508   87,593
Prior      
Total 384,748   263,711
Revolving Loans Amortized Cost Basis      
Total 183,945   178,256
Total      
Total 927,642   904,806
Portfolio Segment and Loan Class | Real estate - commercial mortgage      
2025      
Total 112,253   633,014
Current period gross charge-offs 0   0
2024      
Total 649,465   1,016,309
Current period gross charge-offs 0   (126)
2023      
Total 1,164,643   1,390,901
Current period gross charge-offs 0   (84)
2022      
Total 1,421,190   1,569,160
Current period gross charge-offs (6,654)   0
2021      
Total 1,547,216   1,181,456
Current period gross charge-offs (4,052)   0
Prior      
Total 4,711,401   3,715,159
Current period gross charge-offs (1,400)   (12,950)
Revolving Loans Amortized Cost Basis      
Total 70,100   82,300
Current period gross charge-offs 0   0
Total      
Total 9,676,517   9,601,858
Current period gross charge-offs (12,106)   (13,186)
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Pass      
2025      
Total 112,253   623,742
2024      
Total 632,213   898,296
2023      
Total 1,038,464   1,138,669
2022      
Total 1,200,259   1,316,000
2021      
Total 1,275,597   1,077,625
Prior      
Total 4,297,847   3,414,138
Revolving Loans Amortized Cost Basis      
Total 67,023   69,942
Total      
Total 8,623,905   8,548,058
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Special Mention      
2025      
Total 0   4,441
2024      
Total 9,329   73,348
2023      
Total 59,490   149,280
2022      
Total 132,421   157,543
2021      
Total 189,465   28,734
Prior      
Total 140,269   107,099
Revolving Loans Amortized Cost Basis      
Total 1,830   10,978
Total      
Total 532,804   531,423
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Substandard or Lower      
2025      
Total 0   4,831
2024      
Total 7,923   44,665
2023      
Total 66,689   102,952
2022      
Total 88,510   95,617
2021      
Total 82,154   75,097
Prior      
Total 273,285   193,922
Revolving Loans Amortized Cost Basis      
Total 1,247   1,380
Total      
Total 519,808   522,377
Portfolio Segment and Loan Class | Commercial and Industrial      
2025      
Total 130,577   456,640
Current period gross charge-offs 0   (612)
2024      
Total 431,738   511,646
Current period gross charge-offs (88)   (3,709)
2023      
Total 505,602   567,301
Current period gross charge-offs (473)   (2,560)
2022      
Total 530,734   290,674
Current period gross charge-offs (2,000)   (4,587)
2021      
Total 265,330   285,534
Current period gross charge-offs (557)   (317)
Prior      
Total 1,052,340   793,002
Current period gross charge-offs (502)   (7,612)
Revolving Loans Amortized Cost Basis      
Total 1,600,129   1,669,896
Current period gross charge-offs (245)   (3,553)
Total      
Total 4,531,266   4,605,589
Current period gross charge-offs (3,865)   (26,585)
Portfolio Segment and Loan Class | Commercial and Industrial | Pass      
2025      
Total 130,095   435,917
2024      
Total 404,571   486,720
2023      
Total 460,061   512,622
2022      
Total 488,461   261,603
2021      
Total 242,892   268,194
Prior      
Total 933,896   684,931
Revolving Loans Amortized Cost Basis      
Total 1,300,171   1,375,201
Total      
Total 3,963,380   4,031,534
Portfolio Segment and Loan Class | Commercial and Industrial | Special Mention      
2025      
Total 282   9,928
2024      
Total 15,502   8,333
2023      
Total 23,680   19,931
2022      
Total 15,677   18,888
2021      
Total 10,993   4,844
Prior      
Total 28,846   58,632
Revolving Loans Amortized Cost Basis      
Total 117,361   117,940
Total      
Total 214,920   238,809
Portfolio Segment and Loan Class | Commercial and Industrial | Substandard or Lower      
2025      
Total 200   10,795
2024      
Total 11,665   16,593
2023      
Total 21,861   34,748
2022      
Total 26,596   10,183
2021      
Total 11,445   12,496
Prior      
Total 89,598   49,439
Revolving Loans Amortized Cost Basis      
Total 182,597   176,755
Total      
Total 352,966   335,246
Portfolio Segment and Loan Class | Real estate - construction(1)      
2025      
Total 4,001   197,206
Current period gross charge-offs 0   0
2024      
Total 228,789   504,684
Current period gross charge-offs 0   0
2023      
Total 370,637   252,354
Current period gross charge-offs 0   0
2022      
Total 175,658   116,946
Current period gross charge-offs 0   0
2021      
Total 66,474   9,722
Current period gross charge-offs 0   0
Prior      
Total 64,807   61,830
Current period gross charge-offs 0   0
Revolving Loans Amortized Cost Basis      
Total 33,232   30,729
Current period gross charge-offs 0   0
Total      
Total 943,598   1,175,996
Current period gross charge-offs 0   0
Portfolio Segment and Loan Class | Real estate - construction(1) | Pass      
2025      
Total 4,001   197,206
2024      
Total 228,789   494,072
2023      
Total 360,022   157,296
2022      
Total 88,125   37,438
2021      
Total 37,139   8,784
Prior      
Total 41,753   41,480
Revolving Loans Amortized Cost Basis      
Total 33,131   30,608
Total      
Total 792,960   967,503
Portfolio Segment and Loan Class | Real estate - construction(1) | Special Mention      
2025      
Total 0   0
2024      
Total 0   10,612
2023      
Total 10,615   80,651
2022      
Total 57,540   69,109
2021      
Total 26,426   938
Prior      
Total 1,189   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 95,770   161,310
Portfolio Segment and Loan Class | Real estate - construction(1) | Substandard or Lower      
2025      
Total 0   0
2024      
Total 0   0
2023      
Total 0   14,407
2022      
Total 29,993   10,399
2021      
Total 2,909   0
Prior      
Total 21,865   20,350
Revolving Loans Amortized Cost Basis      
Total 101   121
Total      
Total 54,868   47,183
Payment Activity, Aging Status      
2025      
Total 372,457   912,394
2024      
Total 746,916   998,060
2023      
Total 948,762   1,804,966
2022      
Total 1,720,153   1,815,735
2021      
Total 1,764,903   1,087,446
Prior      
Total 2,089,608   1,082,486
Revolving Loans Amortized Cost Basis      
Total 1,057,911   916,813
Total      
Total 8,711,193   8,661,476
Payment Activity, Aging Status | Performing      
2025      
Total 372,457   912,071
2024      
Total 746,584   995,854
2023      
Total 946,420   1,795,602
2022      
Total 1,706,872   1,810,796
2021      
Total 1,760,637   1,081,147
Prior      
Total 2,050,186   1,038,004
Revolving Loans Amortized Cost Basis      
Total 1,055,160   913,920
Total      
Total 8,647,653   8,587,778
Payment Activity, Aging Status | Nonperforming      
2025      
Total 0   323
2024      
Total 332   2,206
2023      
Total 2,342   9,364
2022      
Total 13,281   4,939
2021      
Total 4,266   6,299
Prior      
Total 39,422   44,482
Revolving Loans Amortized Cost Basis      
Total 2,751   2,893
Total      
Total 63,540   73,698
Payment Activity, Aging Status | Real estate - residential mortgage      
2025      
Total 111,293   471,005
Current period gross charge-offs 0   0
2024      
Total 482,969   729,988
Current period gross charge-offs (19)   (172)
2023      
Total 738,837   1,520,639
Current period gross charge-offs (7)   (106)
2022      
Total 1,509,035   1,730,223
Current period gross charge-offs (121)   (12)
2021      
Total 1,707,583   1,027,639
Current period gross charge-offs 0   (43)
Prior      
Total 1,859,940   870,149
Current period gross charge-offs (196)   (888)
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Total      
Total 6,409,657   6,349,643
Current period gross charge-offs (343)   (1,472)
Payment Activity, Aging Status | Real estate - residential mortgage | Performing      
2025      
Total 111,293   470,918
2024      
Total 482,878   728,630
2023      
Total 736,896   1,515,521
2022      
Total 1,499,902   1,726,991
2021      
Total 1,704,694   1,022,116
Prior      
Total 1,827,116   839,566
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 6,362,779   6,303,742
Payment Activity, Aging Status | Real estate - residential mortgage | Nonperforming      
2025      
Total 0   87
2024      
Total 91   1,358
2023      
Total 1,941   5,118
2022      
Total 9,133   3,232
2021      
Total 2,889   5,523
Prior      
Total 32,824   30,583
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 46,878   45,901
Payment Activity, Aging Status | Consumer and Real Estate - Home Equity      
2025      
Total 158,049   178,958
Current period gross charge-offs 0   (118)
2024      
Total 33,198   117,218
Current period gross charge-offs (96)   (1,016)
2023      
Total 95,387   212,565
Current period gross charge-offs (537)   (1,552)
2022      
Total 158,456   66,375
Current period gross charge-offs (536)   (790)
2021      
Total 41,939   48,954
Current period gross charge-offs (333)   (398)
Prior      
Total 212,352   193,013
Current period gross charge-offs (836)   (2,704)
Revolving Loans Amortized Cost Basis      
Total 1,057,911   916,813
Current period gross charge-offs 145   (75)
Total      
Total 1,767,775   1,777,472
Current period gross charge-offs (2,193)   (8,490)
Payment Activity, Aging Status | Consumer and Real Estate - Home Equity | Performing      
2025      
Total 158,049   178,722
2024      
Total 32,957   116,370
2023      
Total 95,148   211,647
2022      
Total 157,474   65,412
2021      
Total 41,167   48,201
Prior      
Total 205,800   188,442
Revolving Loans Amortized Cost Basis      
Total 1,055,160   913,920
Total      
Total 1,755,092   1,763,098
Payment Activity, Aging Status | Consumer and Real Estate - Home Equity | Nonperforming      
2025      
Total 0   236
2024      
Total 241   848
2023      
Total 239   918
2022      
Total 982   963
2021      
Total 772   753
Prior      
Total 6,552   4,571
Revolving Loans Amortized Cost Basis      
Total 2,751   2,893
Total      
Total 12,683   14,374
Payment Activity, Aging Status | Construction - other      
2025      
Total 28,443   138,440
Current period gross charge-offs 0   0
2024      
Total 164,310   61,848
Current period gross charge-offs 0   0
2023      
Total 29,708   17,116
Current period gross charge-offs 0   0
2022      
Total 9,386   1,499
Current period gross charge-offs 0   0
2021      
Total 0   0
Current period gross charge-offs 0   0
Prior      
Total 0   0
Current period gross charge-offs 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Total      
Total 231,847   218,903
Current period gross charge-offs 0   0
Payment Activity, Aging Status | Construction - other | Performing      
2025      
Total 28,443   138,440
2024      
Total 164,310   61,848
2023      
Total 29,708   15,710
2022      
Total 7,980   1,499
2021      
Total 0   0
Prior      
Total 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 230,441   217,497
Payment Activity, Aging Status | Construction - other | Nonperforming      
2025      
Total 0   0
2024      
Total 0   0
2023      
Total 0   1,406
2022      
Total 1,406   0
2021      
Total 0   0
Prior      
Total 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 1,406   1,406
Payment Activity, Aging Status | Leases and other loans      
2025      
Total 74,672   123,991
Current period gross charge-offs (404)   (1,977)
2024      
Total 66,439   89,006
Current period gross charge-offs (428)   (913)
2023      
Total 84,830   54,646
Current period gross charge-offs (172)   (335)
2022      
Total 43,276   17,638
Current period gross charge-offs (100)   (334)
2021      
Total 15,381   10,853
Current period gross charge-offs (53)   (192)
Prior      
Total 17,316   19,324
Current period gross charge-offs (370)   (770)
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Total      
Total 301,914   315,458
Current period gross charge-offs (1,527)   (4,696)
Payment Activity, Aging Status | Leases and other loans | Performing      
2025      
Total 74,672   123,991
2024      
Total 66,439   89,006
2023      
Total 84,668   52,724
2022      
Total 41,516   16,894
2021      
Total 14,776   10,830
Prior      
Total 17,270   9,996
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 299,341   303,441
Payment Activity, Aging Status | Leases and other loans | Nonperforming      
2025      
Total 0   0
2024      
Total 0   0
2023      
Total 162   1,922
2022      
Total 1,760   744
2021      
Total 605   23
Prior      
Total 46   9,328
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 2,573   12,017
Conversion to Term Loan | Portfolio Segment and Loan Class      
Revolving Loans Amortized Cost Basis      
Total 15,065   46,980
Conversion to Term Loan | Portfolio Segment and Loan Class | Pass      
Revolving Loans Amortized Cost Basis      
Total 3,482   16,611
Conversion to Term Loan | Portfolio Segment and Loan Class | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 2,579   313
Conversion to Term Loan | Portfolio Segment and Loan Class | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 9,004   30,056
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage      
Revolving Loans Amortized Cost Basis      
Total 249   13,559
Current period gross charge-offs 0   (26)
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage | Pass      
Revolving Loans Amortized Cost Basis      
Total 249   9,646
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   3,913
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial      
Revolving Loans Amortized Cost Basis      
Total 14,816   30,896
Current period gross charge-offs 0   (3,635)
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Pass      
Revolving Loans Amortized Cost Basis      
Total 3,233   6,346
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 2,579   313
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 9,004   24,237
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - construction(1)      
Revolving Loans Amortized Cost Basis      
Total 0   2,525
Current period gross charge-offs 0   0
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - construction(1) | Pass      
Revolving Loans Amortized Cost Basis      
Total 0   619
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - construction(1) | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - construction(1) | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   1,906
Conversion to Term Loan | Payment Activity, Aging Status      
Revolving Loans Amortized Cost Basis      
Total 10,483   43,576
Conversion to Term Loan | Payment Activity, Aging Status | Performing      
Revolving Loans Amortized Cost Basis      
Total 9,337   40,384
Conversion to Term Loan | Payment Activity, Aging Status | Nonperforming      
Revolving Loans Amortized Cost Basis      
Total 1,146   3,192
Conversion to Term Loan | Payment Activity, Aging Status | Real estate - residential mortgage      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   (251)
Conversion to Term Loan | Payment Activity, Aging Status | Real estate - residential mortgage | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan | Payment Activity, Aging Status | Real estate - residential mortgage | Nonperforming      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan | Payment Activity, Aging Status | Consumer and Real Estate - Home Equity      
Revolving Loans Amortized Cost Basis      
Total 10,483   43,576
Current period gross charge-offs 0   (1,837)
Conversion to Term Loan | Payment Activity, Aging Status | Consumer and Real Estate - Home Equity | Performing      
Revolving Loans Amortized Cost Basis      
Total 9,337   40,384
Conversion to Term Loan | Payment Activity, Aging Status | Consumer and Real Estate - Home Equity | Nonperforming      
Revolving Loans Amortized Cost Basis      
Total 1,146   3,192
Conversion to Term Loan | Payment Activity, Aging Status | Construction - other      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Conversion to Term Loan | Payment Activity, Aging Status | Construction - other | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan | Payment Activity, Aging Status | Construction - other | Nonperforming      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan | Payment Activity, Aging Status | Leases and other loans      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   (175)
Conversion to Term Loan | Payment Activity, Aging Status | Leases and other loans | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan | Payment Activity, Aging Status | Leases and other loans | Nonperforming      
Revolving Loans Amortized Cost Basis      
Total $ 0   $ 0