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Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 24,018   $ 58,768
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 34,776 $ 38,776 38,776
Provision for credit losses (3,000)   (4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 31,776   34,776
Allowance for credit losses on loans      
Charge offs 24,018   58,768
Provision for credit losses 24,001 17,971  
Allowance for Loan Losses [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 351,094 312,720 312,720
Charge offs (24,018)   (58,768)
Recoveries 1,930   10,142
Net Charge offs (22,088)   (48,626)
Provision for credit losses 27,000   87,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 356,006   351,094
Allowance for credit losses on loans      
Charge offs (24,018)   (58,768)
Recoveries 1,930   10,142
Net Charge offs (22,088)   (48,626)
Allowance for Loan Losses [Member] | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 128,263 119,076 119,076
Charge offs (19,429)   (45,687)
Recoveries 791   3,015
Net Charge offs (18,638)   (42,672)
Provision for credit losses 23,202   51,859
Financing Receivable, Allowance for Credit Loss, Ending Balance 132,826   128,263
Allowance for credit losses on loans      
Charge offs (19,429)   (45,687)
Recoveries 791   3,015
Net Charge offs (18,638)   (42,672)
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 10,610 9,475 9,475
Charge offs (3)   (25)
Recoveries 5   11
Net Charge offs 2   (15)
Provision for credit losses 1,768   1,150
Financing Receivable, Allowance for Credit Loss, Ending Balance 12,381   10,610
Allowance for credit losses on loans      
Charge offs (3)   (25)
Recoveries 5   11
Net Charge offs 2   (15)
Allowance for Loan Losses [Member] | Commercial and business lending      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 138,873 128,551 128,551
Charge offs (19,432)   (45,713)
Recoveries 796   3,026
Net Charge offs (18,636)   (42,687)
Provision for credit losses 24,970   53,009
Financing Receivable, Allowance for Credit Loss, Ending Balance 145,207   138,873
Allowance for credit losses on loans      
Charge offs (19,432)   (45,713)
Recoveries 796   3,026
Net Charge offs (18,636)   (42,687)
Allowance for Loan Losses [Member] | Commercial real estate — investor      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 67,858 54,398 54,398
Charge offs 0   (252)
Recoveries 0   3,016
Net Charge offs 0   2,763
Provision for credit losses 4,137   10,697
Financing Receivable, Allowance for Credit Loss, Ending Balance 71,995   67,858
Allowance for credit losses on loans      
Charge offs 0   (252)
Recoveries 0   3,016
Net Charge offs 0   2,763
Allowance for Loan Losses [Member] | Real estate construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 53,554 45,589 45,589
Charge offs 0   (25)
Recoveries 30   80
Net Charge offs 30   55
Provision for credit losses (4,281)   7,910
Financing Receivable, Allowance for Credit Loss, Ending Balance 49,303   53,554
Allowance for credit losses on loans      
Charge offs 0   (25)
Recoveries 30   80
Net Charge offs 30   55
Allowance for Loan Losses [Member] | Commercial real estate lending      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 121,412 99,986 99,986
Charge offs 0   (277)
Recoveries 30   3,095
Net Charge offs 30   2,819
Provision for credit losses (144)   18,607
Financing Receivable, Allowance for Credit Loss, Ending Balance 121,298   121,412
Allowance for credit losses on loans      
Charge offs 0   (277)
Recoveries 30   3,095
Net Charge offs 30   2,819
Allowance for Loan Losses [Member] | Total commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 260,285 228,538 228,538
Charge offs (19,432)   (45,989)
Recoveries 826   6,121
Net Charge offs (18,606)   (39,868)
Provision for credit losses 24,826   71,616
Financing Receivable, Allowance for Credit Loss, Ending Balance 266,506   260,285
Allowance for credit losses on loans      
Charge offs (19,432)   (45,989)
Recoveries 826   6,121
Net Charge offs (18,606)   (39,868)
Allowance for Loan Losses [Member] | Residential mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 37,808 38,298 38,298
Charge offs (89)   (952)
Recoveries 27   541
Net Charge offs (62)   (411)
Provision for credit losses (1,831)   (79)
Financing Receivable, Allowance for Credit Loss, Ending Balance 35,915   37,808
Allowance for credit losses on loans      
Charge offs (89)   (952)
Recoveries 27   541
Net Charge offs (62)   (411)
Allowance for Loan Losses [Member] | Automobile Loan      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 24,961 19,619 19,619
Charge offs (2,600)   (5,950)
Recoveries 506   1,241
Net Charge offs (2,094)   (4,709)
Provision for credit losses 3,248   10,051
Financing Receivable, Allowance for Credit Loss, Ending Balance 26,114   24,961
Allowance for credit losses on loans      
Charge offs (2,600)   (5,950)
Recoveries 506   1,241
Net Charge offs (2,094)   (4,709)
Allowance for Loan Losses [Member] | Home equity      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 15,403 14,875 14,875
Charge offs (108)   (424)
Recoveries 319   1,262
Net Charge offs 211   837
Provision for credit losses (874)   (310)
Financing Receivable, Allowance for Credit Loss, Ending Balance 14,740   15,403
Allowance for credit losses on loans      
Charge offs (108)   (424)
Recoveries 319   1,262
Net Charge offs 211   837
Allowance for Loan Losses [Member] | Other consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 12,638 11,390 11,390
Charge offs (1,790)   (5,453)
Recoveries 252   978
Net Charge offs (1,537)   (4,475)
Provision for credit losses 1,630   5,723
Financing Receivable, Allowance for Credit Loss, Ending Balance 12,731   12,638
Allowance for credit losses on loans      
Charge offs (1,790)   (5,453)
Recoveries 252   978
Net Charge offs (1,537)   (4,475)
Allowance for Loan Losses [Member] | Total consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 90,809 84,182 84,182
Charge offs (4,586)   (12,779)
Recoveries 1,104   4,021
Net Charge offs (3,482)   (8,758)
Provision for credit losses 2,174   15,384
Financing Receivable, Allowance for Credit Loss, Ending Balance 89,501   90,809
Allowance for credit losses on loans      
Charge offs (4,586)   (12,779)
Recoveries 1,104   4,021
Net Charge offs (3,482)   (8,758)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 34,776 38,776 38,776
Provision for credit losses (3,000)   (4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 31,776   34,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 13,319 12,997 12,997
Provision for credit losses (757)   321
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 12,562   13,319
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 149 103 103
Provision for credit losses 15   46
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 164   149
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 13,468 13,101 13,101
Provision for credit losses (742)   367
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 12,725   13,468
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 480 710 710
Provision for credit losses 37   (230)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 517   480
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 17,024 20,583 20,583
Provision for credit losses (2,103)   (3,558)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 14,921   17,024
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 17,504 21,292 21,292
Provision for credit losses (2,066)   (3,788)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 15,438   17,504
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 30,972 34,393 34,393
Provision for credit losses (2,808)   (3,421)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 28,164   30,972
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 2,629 2,699 2,699
Provision for credit losses (316)   (70)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 2,313   2,629
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 1,174 1,683 1,683
Provision for credit losses 124   (509)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 1,298   1,174
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 3,803 4,382 4,382
Provision for credit losses (192)   (579)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 3,612   3,803
Allowance for Loans Losses and Unfunded Commitments [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs (24,018)   (58,768)
Recoveries 1,930   10,142
Net Charge offs (22,088)   (48,626)
Allowance for credit losses on loans      
Balance at beginning of period 385,870 351,496 351,496
Charge offs (24,018)   (58,768)
Recoveries 1,930   10,142
Net Charge offs (22,088)   (48,626)
Provision for credit losses 24,000   83,000
Balance at end of period $ 387,782   $ 385,870
Percent of Loans 1.31%   1.32%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (19,429)   $ (45,687)
Recoveries 791   3,015
Net Charge offs (18,638)   (42,672)
Allowance for credit losses on loans      
Balance at beginning of period 141,582 132,073 132,073
Charge offs (19,429)   (45,687)
Recoveries 791   3,015
Net Charge offs (18,638)   (42,672)
Provision for credit losses 22,445   52,181
Balance at end of period $ 145,388   $ 141,582
Percent of Loans 1.47%   1.45%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (3)   $ (25)
Recoveries 5   11
Net Charge offs 2   (15)
Allowance for credit losses on loans      
Balance at beginning of period 10,759 9,579 9,579
Charge offs (3)   (25)
Recoveries 5   11
Net Charge offs 2   (15)
Provision for credit losses 1,783   1,195
Balance at end of period $ 12,544   $ 10,759
Percent of Loans 1.14%   1.01%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (19,432)   $ (45,713)
Recoveries 796   3,026
Net Charge offs (18,636)   (42,687)
Allowance for credit losses on loans      
Balance at beginning of period 152,341 141,652 141,652
Charge offs (19,432)   (45,713)
Recoveries 796   3,026
Net Charge offs (18,636)   (42,687)
Provision for credit losses 24,227   53,376
Balance at end of period $ 157,933   $ 152,341
Percent of Loans 1.44%   1.41%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ (252)
Recoveries 0   3,016
Net Charge offs 0   2,763
Allowance for credit losses on loans      
Balance at beginning of period 68,338 55,108 55,108
Charge offs 0   (252)
Recoveries 0   3,016
Net Charge offs 0   2,763
Provision for credit losses 4,174   10,467
Balance at end of period $ 72,512   $ 68,338
Percent of Loans 1.44%   1.33%
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ (25)
Recoveries 30   80
Net Charge offs 30   55
Allowance for credit losses on loans      
Balance at beginning of period 70,578 66,171 66,171
Charge offs 0   (25)
Recoveries 30   80
Net Charge offs 30   55
Provision for credit losses (6,383)   4,351
Balance at end of period $ 64,225   $ 70,578
Percent of Loans 2.81%   3.11%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ (277)
Recoveries 30   3,095
Net Charge offs 30   2,819
Allowance for credit losses on loans      
Balance at beginning of period 138,916 121,279 121,279
Charge offs 0   (277)
Recoveries 30   3,095
Net Charge offs 30   2,819
Provision for credit losses (2,209)   14,819
Balance at end of period $ 136,737   $ 138,916
Percent of Loans 1.87%   1.88%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (19,432)   $ (45,989)
Recoveries 826   6,121
Net Charge offs (18,606)   (39,868)
Allowance for credit losses on loans      
Balance at beginning of period 291,257 262,931 262,931
Charge offs (19,432)   (45,989)
Recoveries 826   6,121
Net Charge offs (18,606)   (39,868)
Provision for credit losses 22,018   68,195
Balance at end of period $ 294,669   $ 291,257
Percent of Loans 1.61%   1.60%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (89)   $ (952)
Recoveries 27   541
Net Charge offs (62)   (411)
Allowance for credit losses on loans      
Balance at beginning of period 37,808 38,298 38,298
Charge offs (89)   (952)
Recoveries 27   541
Net Charge offs (62)   (411)
Provision for credit losses (1,831)   (79)
Balance at end of period $ 35,915   $ 37,808
Percent of Loans 0.46%   0.48%
Allowance for Loans Losses and Unfunded Commitments [Member] | Automobile Loan      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (2,600)   $ (5,950)
Recoveries 506   1,241
Net Charge offs (2,094)   (4,709)
Allowance for credit losses on loans      
Balance at beginning of period 24,961 19,619 19,619
Charge offs (2,600)   (5,950)
Recoveries 506   1,241
Net Charge offs (2,094)   (4,709)
Provision for credit losses 3,248   10,051
Balance at end of period $ 26,114   $ 24,961
Percent of Loans 1.06%   1.11%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (108)   $ (424)
Recoveries 319   1,262
Net Charge offs 211   837
Allowance for credit losses on loans      
Balance at beginning of period 18,032 17,574 17,574
Charge offs (108)   (424)
Recoveries 319   1,262
Net Charge offs 211   837
Provision for credit losses (1,190)   (380)
Balance at end of period $ 17,054   $ 18,032
Percent of Loans 2.75%   2.87%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (1,790)   $ (5,453)
Recoveries 252   978
Net Charge offs (1,537)   (4,475)
Allowance for credit losses on loans      
Balance at beginning of period 13,812 13,073 13,073
Charge offs (1,790)   (5,453)
Recoveries 252   978
Net Charge offs (1,537)   (4,475)
Provision for credit losses 1,755   5,214
Balance at end of period $ 14,029   $ 13,812
Percent of Loans 5.43%   4.97%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (4,586)   $ (12,779)
Recoveries 1,104   4,021
Net Charge offs (3,482)   (8,758)
Allowance for credit losses on loans      
Balance at beginning of period 94,613 $ 88,565 88,565
Charge offs (4,586)   (12,779)
Recoveries 1,104   4,021
Net Charge offs (3,482)   (8,758)
Provision for credit losses 1,982   14,805
Balance at end of period $ 93,112   $ 94,613
Percent of Loans 0.83%   0.86%