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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, 2023
Mar. 31, 2022
Dec. 31, 2022
Total      
Total $ 20,670,188   $ 20,279,547
Current period gross charge-offs (16,903) $ (1,900)  
Commercial and Industrial      
Total      
Total 4,600,696   4,477,537
Real estate - commercial mortgage      
Total      
Total 7,746,920   7,693,835
Real estate - home equity      
Total      
Total 1,074,712   1,102,838
Real estate – residential mortgage      
Total      
Total 4,880,919   4,737,279
Consumer      
Total      
Total 730,775   699,179
Leases and other loans      
Total      
Total 309,412   298,954
Portfolio Segment and Loan Class [Member]      
2022      
Total 602,955   2,094,526
2021      
Total 1,907,822   2,014,166
2020      
Total 2,051,952   1,677,176
2019      
Total 1,618,830   1,250,572
2018      
Total 1,207,816   878,822
Prior      
Total 4,371,453   3,649,811
Revolving Loans Amortized Cost Basis      
Total 1,647,577   1,624,415
Total      
Total 13,415,756   13,190,912
Portfolio Segment and Loan Class [Member] | Pass      
2022      
Total 602,599   2,081,160
2021      
Total 1,870,508   1,935,863
2020      
Total 1,948,110   1,610,405
2019      
Total 1,541,412   1,154,994
2018      
Total 1,124,153   831,206
Prior      
Total 4,022,860   3,308,374
Revolving Loans Amortized Cost Basis      
Total 1,507,051   1,515,897
Total      
Total 12,623,515   12,438,824
Portfolio Segment and Loan Class [Member] | Special Mention      
2022      
Total 150   11,500
2021      
Total 33,082   74,846
2020      
Total 81,819   27,059
2019      
Total 24,762   41,882
2018      
Total 43,852   21,423
Prior      
Total 229,976   227,972
Revolving Loans Amortized Cost Basis      
Total 68,324   56,995
Total      
Total 482,208   461,927
Portfolio Segment and Loan Class [Member] | Substandard or Lower      
2022      
Total 206   1,866
2021      
Total 4,232   3,457
2020      
Total 22,023   39,712
2019      
Total 52,656   53,696
2018      
Total 39,811   26,193
Prior      
Total 118,617   113,465
Revolving Loans Amortized Cost Basis      
Total 72,202   51,523
Total      
Total 310,033   290,161
Portfolio Segment and Loan Class [Member] | Real estate - construction(2)      
2022      
Total 49,829   159,195
Current period gross charge-offs 0   0
2021      
Total 166,874   390,993
Current period gross charge-offs 0   0
2020      
Total 427,628   247,258
Current period gross charge-offs 0   0
2019      
Total 218,594   30,813
Current period gross charge-offs 0   0
2018      
Total 25,625   24,421
Current period gross charge-offs 0   0
Prior      
Total 137,389   119,386
Current period gross charge-offs 0   0
Revolving Loans Amortized Cost Basis      
Total 42,201   47,474
Current period gross charge-offs 0   0
Total      
Total 1,068,140   1,019,540
Current period gross charge-offs 0   0
Portfolio Segment and Loan Class [Member] | Real estate - construction(2) | Pass      
2022      
Total 49,829   159,195
2021      
Total 165,351   390,993
2020      
Total 425,549   243,406
2019      
Total 218,594   28,539
2018      
Total 23,387   24,421
Prior      
Total 103,958   93,511
Revolving Loans Amortized Cost Basis      
Total 39,917   47,271
Total      
Total 1,026,585   987,336
Portfolio Segment and Loan Class [Member] | Real estate - construction(2) | Special Mention      
2022      
Total 0   0
2021      
Total 1,218   0
2020      
Total 0   0
2019      
Total 0   0
2018      
Total 0   0
Prior      
Total 29,283   21,603
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 30,501   21,603
Portfolio Segment and Loan Class [Member] | Real estate - construction(2) | Substandard or Lower      
2022      
Total 0   0
2021      
Total 305   0
2020      
Total 2,079   3,852
2019      
Total 0   2,274
2018      
Total 2,238   0
Prior      
Total 4,148   4,272
Revolving Loans Amortized Cost Basis      
Total 2,284   203
Total      
Total 11,054   10,601
Portfolio Segment and Loan Class [Member] | Commercial and Industrial      
2022      
Total 379,739   919,629
Current period gross charge-offs 0   0
2021      
Total 707,961   474,042
Current period gross charge-offs 0   0
2020      
Total 461,949   406,462
Current period gross charge-offs 0   (36)
2019      
Total 388,589   336,796
Current period gross charge-offs 0   0
2018      
Total 323,934   193,395
Current period gross charge-offs 0   (21)
Prior      
Total 802,106   651,010
Current period gross charge-offs 0   (365)
Revolving Loans Amortized Cost Basis      
Total 1,529,372   1,495,086
Current period gross charge-offs (53)   (1,192)
Total      
Total 4,600,696   4,477,537
Current period gross charge-offs (612)   (2,390)
Portfolio Segment and Loan Class [Member] | Commercial and Industrial | Pass      
2022      
Total 379,383   907,390
2021      
Total 689,276   449,145
2020      
Total 444,738   397,881
2019      
Total 379,630   315,605
2018      
Total 301,392   185,096
Prior      
Total 748,118   604,352
Revolving Loans Amortized Cost Basis      
Total 1,394,101   1,387,961
Total      
Total 4,343,155   4,248,048
Portfolio Segment and Loan Class [Member] | Commercial and Industrial | Special Mention      
2022      
Total 150   11,405
2021      
Total 17,426   24,479
2020      
Total 16,457   3,763
2019      
Total 4,958   8,147
2018      
Total 9,500   5,218
Prior      
Total 31,125   24,633
Revolving Loans Amortized Cost Basis      
Total 65,596   56,048
Total      
Total 145,455   133,943
Portfolio Segment and Loan Class [Member] | Commercial and Industrial | Substandard or Lower      
2022      
Total 206   834
2021      
Total 1,259   418
2020      
Total 754   4,818
2019      
Total 4,001   13,044
2018      
Total 13,042   3,081
Prior      
Total 22,863   22,025
Revolving Loans Amortized Cost Basis      
Total 69,675   51,077
Total      
Total 112,086   95,546
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage      
2022      
Total 173,387   1,015,702
Current period gross charge-offs 0   0
2021      
Total 1,032,987   1,149,131
Current period gross charge-offs 0   0
2020      
Total 1,162,375   1,023,456
Current period gross charge-offs 0   0
2019      
Total 1,011,647   882,963
Current period gross charge-offs 0   0
2018      
Total 858,257   661,006
Current period gross charge-offs 0   0
Prior      
Total 3,431,958   2,879,415
Current period gross charge-offs (30)   (53)
Revolving Loans Amortized Cost Basis      
Total 76,004   81,855
Current period gross charge-offs 0   0
Total      
Total 7,746,920   7,693,835
Current period gross charge-offs (13,362)   (12,473)
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass      
2022      
Total 173,387   1,014,575
2021      
Total 1,015,881   1,095,725
2020      
Total 1,077,823   969,118
2019      
Total 943,188   810,850
2018      
Total 799,374   621,689
Prior      
Total 3,170,784   2,610,511
Revolving Loans Amortized Cost Basis      
Total 73,033   80,665
Total      
Total 7,253,775   7,203,440
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention      
2022      
Total 0   95
2021      
Total 14,438   50,367
2020      
Total 65,362   23,296
2019      
Total 19,804   33,735
2018      
Total 34,352   16,205
Prior      
Total 169,568   181,736
Revolving Loans Amortized Cost Basis      
Total 2,728   947
Total      
Total 306,252   306,381
Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower      
2022      
Total 0   1,032
2021      
Total 2,668   3,039
2020      
Total 19,190   31,042
2019      
Total 48,655   38,378
2018      
Total 24,531   23,112
Prior      
Total 91,606   87,168
Revolving Loans Amortized Cost Basis      
Total 243   243
Total      
Total 186,893   184,014
Payment Activity, Aging Status [Member]      
2022      
Total 372,198   1,663,147
2021      
Total 1,573,713   1,936,748
2020      
Total 1,908,570   1,192,235
2019      
Total 1,156,771   374,362
2018      
Total 363,228   153,878
Prior      
Total 908,673   889,588
Revolving Loans Amortized Cost Basis      
Total 953,807   843,948
Total      
Total 7,254,432   7,088,635
Payment Activity, Aging Status [Member] | Performing      
2022      
Total 372,198   1,661,656
2021      
Total 1,572,360   1,931,346
2020      
Total 1,902,326   1,185,464
2019      
Total 1,149,074   367,860
2018      
Total 357,862   149,193
Prior      
Total 867,593   847,213
Revolving Loans Amortized Cost Basis      
Total 947,347   842,226
Total      
Total 7,186,179   7,019,019
Payment Activity, Aging Status [Member] | Nonperforming Financial Instruments [Member]      
2022      
Total 0   1,491
2021      
Total 1,353   5,402
2020      
Total 6,244   6,771
2019      
Total 7,697   6,502
2018      
Total 5,366   4,685
Prior      
Total 41,080   42,375
Revolving Loans Amortized Cost Basis      
Total 6,460   1,722
Total      
Total 68,253   69,616
Payment Activity, Aging Status [Member] | Consumer and Home Equity      
2022      
Total 148,247   416,923
Current period gross charge-offs 0   0
2021      
Total 310,016   110,022
Current period gross charge-offs 0   (587)
2020      
Total 95,291   80,596
Current period gross charge-offs 0   (70)
2019      
Total 66,444   52,420
Current period gross charge-offs 0   (108)
2018      
Total 49,908   45,740
Current period gross charge-offs 0   (16)
Prior      
Total 164,302   217,639
Current period gross charge-offs (325)   (442)
Revolving Loans Amortized Cost Basis      
Total 953,807   843,948
Current period gross charge-offs 0   (178)
Total      
Total 1,805,487   1,802,017
Current period gross charge-offs (2,206)   (4,412)
Payment Activity, Aging Status [Member] | Consumer and Home Equity | Performing      
2022      
Total 148,247   416,631
2021      
Total 309,812   109,724
2020      
Total 95,136   80,422
2019      
Total 66,377   52,384
2018      
Total 49,877   45,642
Prior      
Total 162,289   211,127
Revolving Loans Amortized Cost Basis      
Total 947,347   842,226
Total      
Total 1,796,504   1,792,217
Payment Activity, Aging Status [Member] | Consumer and Home Equity | Nonperforming Financial Instruments [Member]      
2022      
Total 0   292
2021      
Total 204   298
2020      
Total 155   174
2019      
Total 67   36
2018      
Total 31   98
Prior      
Total 2,013   6,512
Revolving Loans Amortized Cost Basis      
Total 6,460   1,722
Total      
Total 8,983   9,800
Payment Activity, Aging Status [Member] | Real estate – residential mortgage      
2022      
Total 139,551   935,102
Current period gross charge-offs 0   0
2021      
Total 961,843   1,713,807
Current period gross charge-offs 0   0
2020      
Total 1,738,247   1,060,723
Current period gross charge-offs 0   0
2019      
Total 1,048,684   292,633
Current period gross charge-offs 0   0
2018      
Total 287,365   92,042
Current period gross charge-offs 0   0
Prior      
Total 705,229   642,972
Current period gross charge-offs 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Total      
Total 4,880,919   4,737,279
Current period gross charge-offs 0   (66)
Payment Activity, Aging Status [Member] | Real estate – residential mortgage | Performing      
2022      
Total 139,551   933,903
2021      
Total 961,137   1,708,703
2020      
Total 1,732,158   1,054,126
2019      
Total 1,041,054   286,167
2018      
Total 282,030   87,455
Prior      
Total 678,413   620,416
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 4,834,343   4,690,770
Payment Activity, Aging Status [Member] | Real estate – residential mortgage | Nonperforming Financial Instruments [Member]      
2022      
Total 0   1,199
2021      
Total 706   5,104
2020      
Total 6,089   6,597
2019      
Total 7,630   6,466
2018      
Total 5,335   4,587
Prior      
Total 26,816   22,556
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 46,576   46,509
Payment Activity, Aging Status [Member] | Leases and other loans      
2022      
Total 75,403   146,198
Current period gross charge-offs (59)   (506)
2021      
Total 99,568   39,427
Current period gross charge-offs (251)   (167)
2020      
Total 36,559   40,024
Current period gross charge-offs (60)   (140)
2019      
Total 32,785   29,309
Current period gross charge-offs (45)   (80)
2018      
Total 25,955   15,019
Current period gross charge-offs (21)   (47)
Prior      
Total 39,142   28,977
Current period gross charge-offs (287)   (1,191)
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Total      
Total 309,412   298,954
Current period gross charge-offs (723)   (2,131)
Payment Activity, Aging Status [Member] | Leases and other loans | Performing      
2022      
Total 75,403   146,198
2021      
Total 99,125   39,427
2020      
Total 36,559   40,024
2019      
Total 32,785   29,309
2018      
Total 25,955   15,019
Prior      
Total 26,891   15,670
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 296,718   285,647
Payment Activity, Aging Status [Member] | Leases and other loans | Nonperforming Financial Instruments [Member]      
2022      
Total 0   0
2021      
Total 443   0
2020      
Total 0   0
2019      
Total 0   0
2018      
Total 0   0
Prior      
Total 12,251   13,307
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 12,694   13,307
Payment Activity, Aging Status [Member] | Construction - other      
2022      
Total 8,997   164,924
Current period gross charge-offs 0   0
2021      
Total 202,286   73,492
Current period gross charge-offs 0   0
2020      
Total 38,473   10,892
Current period gross charge-offs 0   0
2019      
Total 8,858   0
Current period gross charge-offs 0   0
2018      
Total 0   1,077
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 258,614   250,385
Current period gross charge-offs 0   0
Payment Activity, Aging Status [Member] | Construction - other | Performing      
2022      
Total 8,997   164,924
2021      
Total 202,286   73,492
2020      
Total 38,473   10,892
2019      
Total 8,858   0
2018      
Total 0   1,077
Prior      
Total 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 258,614   250,385
Payment Activity, Aging Status [Member] | Construction - other | Nonperforming Financial Instruments [Member]      
2022      
Total 0   0
2021      
Total 0   0
2020      
Total 0   0
2019      
Total 0   0
2018      
Total 0   0
Prior      
Total 0   0
Revolving Loans Amortized Cost Basis      
Total 0   0
Total      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member]      
Revolving Loans Amortized Cost Basis      
Total 7,351   1,424
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Pass      
Revolving Loans Amortized Cost Basis      
Total 6,822   925
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 243   250
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 286   249
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(2)      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(2) | Pass      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(2) | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - construction(2) | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and Industrial      
Revolving Loans Amortized Cost Basis      
Total 7,046   1,117
Current period gross charge-offs (559)   (776)
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and Industrial | Pass      
Revolving Loans Amortized Cost Basis      
Total 6,517   618
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and Industrial | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 243   250
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Commercial and Industrial | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 286   249
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage      
Revolving Loans Amortized Cost Basis      
Total 305   307
Current period gross charge-offs (13,332)   (12,420)
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Pass      
Revolving Loans Amortized Cost Basis      
Total 305   307
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Special Mention      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Portfolio Segment and Loan Class [Member] | Real estate - commercial mortgage | Substandard or Lower      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member]      
Revolving Loans Amortized Cost Basis      
Total 17,472   34,729
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Performing      
Revolving Loans Amortized Cost Basis      
Total 17,419   34,061
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 53   668
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer and Home Equity      
Revolving Loans Amortized Cost Basis      
Total 17,472   34,729
Current period gross charge-offs (1,881)   (3,011)
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer and Home Equity | Performing      
Revolving Loans Amortized Cost Basis      
Total 17,419   34,061
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Consumer and Home Equity | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 53   668
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate – residential mortgage      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   (66)
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate – residential mortgage | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Real estate – residential mortgage | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Leases and other loans      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Leases and other loans | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Leases and other loans | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other      
Revolving Loans Amortized Cost Basis      
Total 0   0
Current period gross charge-offs 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Performing      
Revolving Loans Amortized Cost Basis      
Total 0   0
Conversion to Term Loan [Member] | Payment Activity, Aging Status [Member] | Construction - other | Nonperforming Financial Instruments [Member]      
Revolving Loans Amortized Cost Basis      
Total $ 0   $ 0