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Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ 47,317   $ 76,415
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     38,776 $ 34,776 34,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (2,500)   4,000
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance $ 36,276   36,276   38,776
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     47,317   76,415
Provision for Loan, Lease, and Other Losses 16,000 $ 20,991 46,999 68,000  
Allowance for Loan Losses [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     363,545 351,094 351,094
Financing Receivable, Allowance for Credit Loss, Writeoff     (47,317)   (76,415)
Financing Receivable, Allowance for Credit Loss, Recovery     12,613   7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (34,704)   (68,549)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     49,500   81,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 378,341   378,341   363,545
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (47,317)   (76,415)
Financing Receivable, Allowance for Credit Loss, Recovery     12,613   7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (34,704)   (68,549)
Allowance for Loan Losses [Member] | Commercial and Industrial Sector [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     136,596 128,263 128,263
Financing Receivable, Allowance for Credit Loss, Writeoff     (12,286)   (47,517)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,369)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     32,261   53,703
Financing Receivable, Allowance for Credit Loss, Ending Balance 161,075   161,075   136,596
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (12,286)   (47,517)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,369)
Allowance for Loan Losses [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     9,417 10,610 10,610
Financing Receivable, Allowance for Credit Loss, Writeoff     0   (3)
Financing Receivable, Allowance for Credit Loss, Recovery     0   7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     0   4
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     1,872   (1,198)
Financing Receivable, Allowance for Credit Loss, Ending Balance 11,289   11,289   9,417
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     0   (3)
Financing Receivable, Allowance for Credit Loss, Recovery     0   7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     0   4
Allowance for Loan Losses [Member] | Commercial And Business Lending [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     146,013 138,873 138,873
Financing Receivable, Allowance for Credit Loss, Writeoff     (12,286)   (47,520)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,365)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     34,133   52,505
Financing Receivable, Allowance for Credit Loss, Ending Balance 172,364   172,364   146,013
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (12,286)   (47,520)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,365)
Allowance for Loan Losses [Member] | Commercial Real Estate Investor Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     71,547 67,858 67,858
Financing Receivable, Allowance for Credit Loss, Writeoff     (21,206)   (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     2,891   0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,315)   (11,187)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     8,540   14,876
Financing Receivable, Allowance for Credit Loss, Ending Balance 61,772   61,772   71,547
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (21,206)   (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     2,891   0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,315)   (11,187)
Allowance for Loan Losses [Member] | Construction Loans [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     51,499 53,554 53,554
Financing Receivable, Allowance for Credit Loss, Writeoff     0   0
Financing Receivable, Allowance for Credit Loss, Recovery     152   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     152   65
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     (988)   (2,119)
Financing Receivable, Allowance for Credit Loss, Ending Balance 50,663   50,663   51,499
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     0   0
Financing Receivable, Allowance for Credit Loss, Recovery     152   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     152   65
Allowance for Loan Losses [Member] | Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     123,046 121,412 121,412
Financing Receivable, Allowance for Credit Loss, Writeoff     (21,206)   (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     3,043   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,163)   (11,122)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     7,551   12,756
Financing Receivable, Allowance for Credit Loss, Ending Balance 112,435   112,435   123,046
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (21,206)   (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     3,043   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,163)   (11,122)
Allowance for Loan Losses [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     269,060 260,285 260,285
Financing Receivable, Allowance for Credit Loss, Writeoff     (33,492)   (58,707)
Financing Receivable, Allowance for Credit Loss, Recovery     7,547   2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (25,945)   (56,487)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     41,685   65,262
Financing Receivable, Allowance for Credit Loss, Ending Balance 284,799   284,799   269,060
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (33,492)   (58,707)
Financing Receivable, Allowance for Credit Loss, Recovery     7,547   2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (25,945)   (56,487)
Allowance for Loan Losses [Member] | Residential Mortgage [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     32,576 37,808 37,808
Financing Receivable, Allowance for Credit Loss, Writeoff     (882)   (1,029)
Financing Receivable, Allowance for Credit Loss, Recovery     547   280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (335)   (750)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     2,575   (4,483)
Financing Receivable, Allowance for Credit Loss, Ending Balance 34,815   34,815   32,576
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (882)   (1,029)
Financing Receivable, Allowance for Credit Loss, Recovery     547   280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (335)   (750)
Allowance for Loan Losses [Member] | Automobile Loan [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     28,467 24,961 24,961
Financing Receivable, Allowance for Credit Loss, Writeoff     (6,118)   (9,541)
Financing Receivable, Allowance for Credit Loss, Recovery     2,405   2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (3,713)   (6,637)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     2,637   10,142
Financing Receivable, Allowance for Credit Loss, Ending Balance 27,391   27,391   28,467
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (6,118)   (9,541)
Financing Receivable, Allowance for Credit Loss, Recovery     2,405   2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (3,713)   (6,637)
Allowance for Loan Losses [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     16,620 15,403 15,403
Financing Receivable, Allowance for Credit Loss, Writeoff     (164)   (216)
Financing Receivable, Allowance for Credit Loss, Recovery     746   1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     582   1,150
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     (1,123)   67
Financing Receivable, Allowance for Credit Loss, Ending Balance 16,078   16,078   16,620
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (164)   (216)
Financing Receivable, Allowance for Credit Loss, Recovery     746   1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     582   1,150
Allowance for Loan Losses [Member] | Other Consumer [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     16,824 12,638 12,638
Financing Receivable, Allowance for Credit Loss, Writeoff     (6,661)   (6,922)
Financing Receivable, Allowance for Credit Loss, Recovery     1,368   1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (5,293)   (5,826)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     3,727   10,012
Financing Receivable, Allowance for Credit Loss, Ending Balance 15,258   15,258   16,824
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (6,661)   (6,922)
Financing Receivable, Allowance for Credit Loss, Recovery     1,368   1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (5,293)   (5,826)
Allowance for Loan Losses [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     94,486 90,809 90,809
Financing Receivable, Allowance for Credit Loss, Writeoff     (13,825)   (17,709)
Financing Receivable, Allowance for Credit Loss, Recovery     5,066   5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,759)   (12,062)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     7,815   15,738
Financing Receivable, Allowance for Credit Loss, Ending Balance 93,542   93,542   94,486
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (13,825)   (17,709)
Financing Receivable, Allowance for Credit Loss, Recovery     5,066   5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,759)   (12,062)
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     38,776 34,776 34,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (2,500)   4,000
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 36,276   36,276   38,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and Industrial Sector [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     14,456 13,319 13,319
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     2,303   1,137
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 16,759   16,759   14,456
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     151 149 149
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     3   2
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 154   154   151
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial And Business Lending [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     14,607 13,468 13,468
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     2,305   1,139
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 16,912   16,912   14,607
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Investor Portfolio Segment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     578 480 480
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     104   98
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 682   682   578
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Construction Loans [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     19,591 17,024 17,024
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (4,930)   2,567
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 14,661   14,661   19,591
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Real Estate Portfolio Segment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     20,169 17,504 17,504
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (4,826)   2,664
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 15,343   15,343   20,169
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial Portfolio Segment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     34,776 30,972 30,972
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (2,521)   3,803
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 32,255   32,255   34,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home Equity Line of Credit [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     2,465 2,629 2,629
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (3)   (164)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 2,461   2,461   2,465
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other Consumer [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     1,535 1,174 1,174
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     24   361
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 1,559   1,559   1,535
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Consumer Portfolio Segment [Member]          
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     4,000 3,803 3,803
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     21   197
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 4,021   4,021   4,000
Allowance for Loans Losses and Unfunded Commitments [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (47,317)   (76,415)
Financing Receivable, Allowance for Credit Loss, Recovery     12,613   7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (34,704)   (68,549)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     402,322 385,870 385,870
Financing Receivable, Allowance for Credit Loss, Writeoff     (47,317)   (76,415)
Financing Receivable, Allowance for Credit Loss, Recovery     12,613   7,867
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (34,704)   (68,549)
Provision for Loan, Lease, and Other Losses     47,000   85,000
Balance at end of period $ 414,618   $ 414,618   $ 402,322
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.34%   1.34%   1.35%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and Industrial Sector [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (12,286)   $ (47,517)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,369)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     151,052 141,582 141,582
Financing Receivable, Allowance for Credit Loss, Writeoff     (12,286)   (47,517)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,148
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,369)
Provision for Loan, Lease, and Other Losses     34,564   54,840
Balance at end of period $ 177,834   $ 177,834   $ 151,052
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.54%   1.54%   1.43%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ 0   $ (3)
Financing Receivable, Allowance for Credit Loss, Recovery     0   7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     0   4
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     9,568 10,759 10,759
Financing Receivable, Allowance for Credit Loss, Writeoff     0   (3)
Financing Receivable, Allowance for Credit Loss, Recovery     0   7
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     0   4
Provision for Loan, Lease, and Other Losses     1,875   (1,196)
Balance at end of period $ 11,443   $ 11,443   $ 9,568
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.00%   1.00%   0.84%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial And Business Lending [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (12,286)   $ (47,520)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,365)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     160,620 152,341 152,341
Financing Receivable, Allowance for Credit Loss, Writeoff     (12,286)   (47,520)
Financing Receivable, Allowance for Credit Loss, Recovery     4,504   2,155
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (7,782)   (45,365)
Provision for Loan, Lease, and Other Losses     36,438   53,644
Balance at end of period $ 189,277   $ 189,277   $ 160,620
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.49%   1.49%   1.37%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Investor Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (21,206)   $ (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     2,891   0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,315)   (11,187)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     72,125 68,338 68,338
Financing Receivable, Allowance for Credit Loss, Writeoff     (21,206)   (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     2,891   0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,315)   (11,187)
Provision for Loan, Lease, and Other Losses     8,644   14,973
Balance at end of period $ 62,454   $ 62,454   $ 72,125
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.16%   1.16%   1.38%
Allowance for Loans Losses and Unfunded Commitments [Member] | Construction Loans [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ 0   $ 0
Financing Receivable, Allowance for Credit Loss, Recovery     152   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     152   65
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     71,090 70,578 70,578
Financing Receivable, Allowance for Credit Loss, Writeoff     0   0
Financing Receivable, Allowance for Credit Loss, Recovery     152   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     152   65
Provision for Loan, Lease, and Other Losses     (5,919)   447
Balance at end of period $ 65,324   $ 65,324   $ 71,090
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 3.33%   3.33%   3.59%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (21,206)   $ (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     3,043   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,163)   (11,122)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     143,215 138,916 138,916
Financing Receivable, Allowance for Credit Loss, Writeoff     (21,206)   (11,187)
Financing Receivable, Allowance for Credit Loss, Recovery     3,043   65
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (18,163)   (11,122)
Provision for Loan, Lease, and Other Losses     2,725   15,421
Balance at end of period $ 127,778   $ 127,778   $ 143,215
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.74%   1.74%   1.99%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (33,492)   $ (58,707)
Financing Receivable, Allowance for Credit Loss, Recovery     7,547   2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (25,945)   (56,487)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     303,835 291,257 291,257
Financing Receivable, Allowance for Credit Loss, Writeoff     (33,492)   (58,707)
Financing Receivable, Allowance for Credit Loss, Recovery     7,547   2,220
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (25,945)   (56,487)
Provision for Loan, Lease, and Other Losses     39,164   69,065
Balance at end of period $ 317,054   $ 317,054   $ 303,835
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.58%   1.58%   1.61%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential Mortgage [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (882)   $ (1,029)
Financing Receivable, Allowance for Credit Loss, Recovery     547   280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (335)   (750)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     32,576 37,808 37,808
Financing Receivable, Allowance for Credit Loss, Writeoff     (882)   (1,029)
Financing Receivable, Allowance for Credit Loss, Recovery     547   280
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (335)   (750)
Provision for Loan, Lease, and Other Losses     2,575   (4,483)
Balance at end of period $ 34,815   $ 34,815   $ 32,576
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 0.51%   0.51%   0.46%
Allowance for Loans Losses and Unfunded Commitments [Member] | Automobile Loan [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (6,118)   $ (9,541)
Financing Receivable, Allowance for Credit Loss, Recovery     2,405   2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (3,713)   (6,637)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     28,467 24,961 24,961
Financing Receivable, Allowance for Credit Loss, Writeoff     (6,118)   (9,541)
Financing Receivable, Allowance for Credit Loss, Recovery     2,405   2,905
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (3,713)   (6,637)
Provision for Loan, Lease, and Other Losses     2,637   10,142
Balance at end of period $ 27,391   $ 27,391   $ 28,467
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 0.90%   0.90%   1.01%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (164)   $ (216)
Financing Receivable, Allowance for Credit Loss, Recovery     746   1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     582   1,150
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     19,085 18,032 18,032
Financing Receivable, Allowance for Credit Loss, Writeoff     (164)   (216)
Financing Receivable, Allowance for Credit Loss, Recovery     746   1,366
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     582   1,150
Provision for Loan, Lease, and Other Losses     (1,127)   (97)
Balance at end of period $ 18,540   $ 18,540   $ 19,085
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 2.66%   2.66%   2.87%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other Consumer [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (6,661)   $ (6,922)
Financing Receivable, Allowance for Credit Loss, Recovery     1,368   1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (5,293)   (5,826)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     18,359 13,812 13,812
Financing Receivable, Allowance for Credit Loss, Writeoff     (6,661)   (6,922)
Financing Receivable, Allowance for Credit Loss, Recovery     1,368   1,096
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (5,293)   (5,826)
Provision for Loan, Lease, and Other Losses     3,751   10,373
Balance at end of period $ 16,817   $ 16,817   $ 18,359
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 5.46%   5.46%   5.76%
Allowance for Loans Losses and Unfunded Commitments [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ (13,825)   $ (17,709)
Financing Receivable, Allowance for Credit Loss, Recovery     5,066   5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,759)   (12,062)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     98,486 $ 94,613 94,613
Financing Receivable, Allowance for Credit Loss, Writeoff     (13,825)   (17,709)
Financing Receivable, Allowance for Credit Loss, Recovery     5,066   5,647
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,759)   (12,062)
Provision for Loan, Lease, and Other Losses     7,836   15,935
Balance at end of period $ 97,563   $ 97,563   $ 98,486
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 0.89%   0.89%   0.91%