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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     $ 62,645   $ 58,768
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance     34,776 $ 38,776 38,776
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     1,000   (4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance $ 35,776   35,776   34,776
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     62,645   58,768
Provision for Loan, Lease, and Other Losses 20,991 $ 21,943 68,000 62,014  
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
Financing Receivable, Allowance for Credit Loss, Writeoff     (62,645)   (58,768)
Financing Receivable, Allowance for Credit Loss, Recovery     6,316   10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (56,329)   (48,626)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     67,000   87,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 361,765   361,765   351,094
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (62,645)   (58,768)
Financing Receivable, Allowance for Credit Loss, Recovery     6,316   10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (56,329)   (48,626)
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     128,263 119,076 119,076
Financing Receivable, Allowance for Credit Loss, Writeoff     (44,896)   (45,687)
Financing Receivable, Allowance for Credit Loss, Recovery     1,933   3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,963)   (42,672)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     33,104   51,859
Financing Receivable, Allowance for Credit Loss, Ending Balance 118,404   118,404   128,263
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (44,896)   (45,687)
Financing Receivable, Allowance for Credit Loss, Recovery     1,933   3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,963)   (42,672)
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     10,610 9,475 9,475
Financing Receivable, Allowance for Credit Loss, Writeoff     (3)   (25)
Financing Receivable, Allowance for Credit Loss, Recovery     6   11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     4   (15)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     1,099   1,150
Financing Receivable, Allowance for Credit Loss, Ending Balance 11,713   11,713   10,610
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (3)   (25)
Financing Receivable, Allowance for Credit Loss, Recovery     6   11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     4   (15)
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     138,873 128,551 128,551
Financing Receivable, Allowance for Credit Loss, Writeoff     (44,899)   (45,713)
Financing Receivable, Allowance for Credit Loss, Recovery     1,939   3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,959)   (42,687)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     34,202   53,009
Financing Receivable, Allowance for Credit Loss, Ending Balance 130,116   130,116   138,873
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (44,899)   (45,713)
Financing Receivable, Allowance for Credit Loss, Recovery     1,939   3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,959)   (42,687)
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     67,858 54,398 54,398
Financing Receivable, Allowance for Credit Loss, Writeoff     (4,570)   (252)
Financing Receivable, Allowance for Credit Loss, Recovery     0   3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,570)   2,763
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     14,776   10,697
Financing Receivable, Allowance for Credit Loss, Ending Balance 78,064   78,064   67,858
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (4,570)   (252)
Financing Receivable, Allowance for Credit Loss, Recovery     0   3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,570)   2,763
Allowance for Loan Losses [Member] | Construction Loans [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     53,554 45,589 45,589
Financing Receivable, Allowance for Credit Loss, Writeoff     0   (25)
Financing Receivable, Allowance for Credit Loss, Recovery     60   80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     60   55
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     8,287   7,910
Financing Receivable, Allowance for Credit Loss, Ending Balance 61,901   61,901   53,554
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     0   (25)
Financing Receivable, Allowance for Credit Loss, Recovery     60   80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     60   55
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     121,412 99,986 99,986
Financing Receivable, Allowance for Credit Loss, Writeoff     (4,570)   (277)
Financing Receivable, Allowance for Credit Loss, Recovery     60   3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,509)   2,819
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     23,063   18,607
Financing Receivable, Allowance for Credit Loss, Ending Balance 139,965   139,965   121,412
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (4,570)   (277)
Financing Receivable, Allowance for Credit Loss, Recovery     60   3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,509)   2,819
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     260,285 228,538 228,538
Financing Receivable, Allowance for Credit Loss, Writeoff     (49,469)   (45,989)
Financing Receivable, Allowance for Credit Loss, Recovery     2,000   6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (47,469)   (39,868)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     57,265   71,616
Financing Receivable, Allowance for Credit Loss, Ending Balance 270,081   270,081   260,285
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (49,469)   (45,989)
Financing Receivable, Allowance for Credit Loss, Recovery     2,000   6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (47,469)   (39,868)
Allowance for Loan Losses [Member] | Residential Mortgage [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     37,808 38,298 38,298
Financing Receivable, Allowance for Credit Loss, Writeoff     (703)   (952)
Financing Receivable, Allowance for Credit Loss, Recovery     192   541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (510)   (411)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     (2,366)   (79)
Financing Receivable, Allowance for Credit Loss, Ending Balance 34,931   34,931   37,808
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (703)   (952)
Financing Receivable, Allowance for Credit Loss, Recovery     192   541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (510)   (411)
Allowance for Loan Losses [Member] | Automobile Loan [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     24,961 19,619 19,619
Financing Receivable, Allowance for Credit Loss, Writeoff     (7,189)   (5,950)
Financing Receivable, Allowance for Credit Loss, Recovery     2,335   1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,855)   (4,709)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     7,914   10,051
Financing Receivable, Allowance for Credit Loss, Ending Balance 28,020   28,020   24,961
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (7,189)   (5,950)
Financing Receivable, Allowance for Credit Loss, Recovery     2,335   1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,855)   (4,709)
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     15,403 14,875 14,875
Financing Receivable, Allowance for Credit Loss, Writeoff     (168)   (424)
Financing Receivable, Allowance for Credit Loss, Recovery     1,041   1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     873   837
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     (197)   (310)
Financing Receivable, Allowance for Credit Loss, Ending Balance 16,079   16,079   15,403
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (168)   (424)
Financing Receivable, Allowance for Credit Loss, Recovery     1,041   1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     873   837
Allowance for Loan Losses [Member] | Other Consumer [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Beginning Balance     12,638 11,390 11,390
Financing Receivable, Allowance for Credit Loss, Writeoff     (5,116)   (5,453)
Financing Receivable, Allowance for Credit Loss, Recovery     748   978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,368)   (4,475)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     4,384   5,723
Financing Receivable, Allowance for Credit Loss, Ending Balance 12,653   12,653   12,638
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (5,116)   (5,453)
Financing Receivable, Allowance for Credit Loss, Recovery     748   978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,368)   (4,475)
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     90,809 84,182 84,182
Financing Receivable, Allowance for Credit Loss, Writeoff     (13,176)   (12,779)
Financing Receivable, Allowance for Credit Loss, Recovery     4,316   4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,860)   (8,758)
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     9,735   15,384
Financing Receivable, Allowance for Credit Loss, Ending Balance 91,684   91,684   90,809
Allowance for Credit Losses on Loans [Abstract]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (13,176)   (12,779)
Financing Receivable, Allowance for Credit Loss, Recovery     4,316   4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,860)   (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
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     1,000   (4,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 35,776   35,776   34,776
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     13,319 12,997 12,997
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     452   321
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 13,771   13,771   13,319
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     149 103 103
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (62)   46
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 87   87   149
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     13,468 13,101 13,101
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     390   367
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 13,858   13,858   13,468
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     480 710 710
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     199   (230)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 679   679   480
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     17,024 20,583 20,583
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     211   (3,558)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 17,235   17,235   17,024
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     17,504 21,292 21,292
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     410   (3,788)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 17,914   17,914   17,504
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     30,972 34,393 34,393
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     800   (3,421)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 31,772   31,772   30,972
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     2,629 2,699 2,699
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     (81)   (70)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 2,548   2,548   2,629
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     1,174 1,683 1,683
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     282   (509)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 1,456   1,456   1,174
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     3,803 4,382 4,382
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)     200   (579)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 4,004   4,004   3,803
Allowance for Loans Losses and Unfunded Commitments [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Financing Receivable, Allowance for Credit Loss, Writeoff     (62,645)   (58,768)
Financing Receivable, Allowance for Credit Loss, Recovery     6,316   10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (56,329)   (48,626)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     385,870 351,496 351,496
Financing Receivable, Allowance for Credit Loss, Writeoff     (62,645)   (58,768)
Financing Receivable, Allowance for Credit Loss, Recovery     6,316   10,142
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (56,329)   (48,626)
Provision for Loan, Lease, and Other Losses     68,000   83,000
Balance at end of period $ 397,541   $ 397,541   $ 385,870
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.33%   1.33%   1.32%
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     $ (44,896)   $ (45,687)
Financing Receivable, Allowance for Credit Loss, Recovery     1,933   3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,963)   (42,672)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     141,582 132,073 132,073
Financing Receivable, Allowance for Credit Loss, Writeoff     (44,896)   (45,687)
Financing Receivable, Allowance for Credit Loss, Recovery     1,933   3,015
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,963)   (42,672)
Provision for Loan, Lease, and Other Losses     33,556   52,181
Balance at end of period $ 132,175   $ 132,175   $ 141,582
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.29%   1.29%   1.45%
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     $ (3)   $ (25)
Financing Receivable, Allowance for Credit Loss, Recovery     6   11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     4   (15)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     10,759 9,579 9,579
Financing Receivable, Allowance for Credit Loss, Writeoff     (3)   (25)
Financing Receivable, Allowance for Credit Loss, Recovery     6   11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     4   (15)
Provision for Loan, Lease, and Other Losses     1,036   1,195
Balance at end of period $ 11,799   $ 11,799   $ 10,759
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.05%   1.05%   1.01%
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     $ (44,899)   $ (45,713)
Financing Receivable, Allowance for Credit Loss, Recovery     1,939   3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,959)   (42,687)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     152,341 141,652 141,652
Financing Receivable, Allowance for Credit Loss, Writeoff     (44,899)   (45,713)
Financing Receivable, Allowance for Credit Loss, Recovery     1,939   3,026
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (42,959)   (42,687)
Provision for Loan, Lease, and Other Losses     34,592   53,376
Balance at end of period $ 143,974   $ 143,974   $ 152,341
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.27%   1.27%   1.41%
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     $ (4,570)   $ (252)
Financing Receivable, Allowance for Credit Loss, Recovery     0   3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,570)   2,763
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     68,338 55,108 55,108
Financing Receivable, Allowance for Credit Loss, Writeoff     (4,570)   (252)
Financing Receivable, Allowance for Credit Loss, Recovery     0   3,016
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,570)   2,763
Provision for Loan, Lease, and Other Losses     14,975   10,467
Balance at end of period $ 78,743   $ 78,743   $ 68,338
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.55%   1.55%   1.33%
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   $ (25)
Financing Receivable, Allowance for Credit Loss, Recovery     60   80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     60   55
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     70,578 66,171 66,171
Financing Receivable, Allowance for Credit Loss, Writeoff     0   (25)
Financing Receivable, Allowance for Credit Loss, Recovery     60   80
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     60   55
Provision for Loan, Lease, and Other Losses     8,497   4,351
Balance at end of period $ 79,136   $ 79,136   $ 70,578
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 3.74%   3.74%   3.11%
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     $ (4,570)   $ (277)
Financing Receivable, Allowance for Credit Loss, Recovery     60   3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,509)   2,819
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     138,916 121,279 121,279
Financing Receivable, Allowance for Credit Loss, Writeoff     (4,570)   (277)
Financing Receivable, Allowance for Credit Loss, Recovery     60   3,095
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,509)   2,819
Provision for Loan, Lease, and Other Losses     23,472   14,819
Balance at end of period $ 157,879   $ 157,879   $ 138,916
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 2.20%   2.20%   1.88%
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     $ (49,469)   $ (45,989)
Financing Receivable, Allowance for Credit Loss, Recovery     2,000   6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (47,469)   (39,868)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     291,257 262,931 262,931
Financing Receivable, Allowance for Credit Loss, Writeoff     (49,469)   (45,989)
Financing Receivable, Allowance for Credit Loss, Recovery     2,000   6,121
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (47,469)   (39,868)
Provision for Loan, Lease, and Other Losses     58,065   68,195
Balance at end of period $ 301,853   $ 301,853   $ 291,257
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.63%   1.63%   1.60%
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     $ (703)   $ (952)
Financing Receivable, Allowance for Credit Loss, Recovery     192   541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (510)   (411)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     37,808 38,298 38,298
Financing Receivable, Allowance for Credit Loss, Writeoff     (703)   (952)
Financing Receivable, Allowance for Credit Loss, Recovery     192   541
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (510)   (411)
Provision for Loan, Lease, and Other Losses     (2,366)   (79)
Balance at end of period $ 34,931   $ 34,931   $ 37,808
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 0.45%   0.45%   0.48%
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     $ (7,189)   $ (5,950)
Financing Receivable, Allowance for Credit Loss, Recovery     2,335   1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,855)   (4,709)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     24,961 19,619 19,619
Financing Receivable, Allowance for Credit Loss, Writeoff     (7,189)   (5,950)
Financing Receivable, Allowance for Credit Loss, Recovery     2,335   1,241
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,855)   (4,709)
Provision for Loan, Lease, and Other Losses     7,914   10,051
Balance at end of period $ 28,020   $ 28,020   $ 24,961
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 1.03%   1.03%   1.11%
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     $ (168)   $ (424)
Financing Receivable, Allowance for Credit Loss, Recovery     1,041   1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     873   837
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     18,032 17,574 17,574
Financing Receivable, Allowance for Credit Loss, Writeoff     (168)   (424)
Financing Receivable, Allowance for Credit Loss, Recovery     1,041   1,262
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     873   837
Provision for Loan, Lease, and Other Losses     (278)   (380)
Balance at end of period $ 18,627   $ 18,627   $ 18,032
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 2.86%   2.86%   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     $ (5,116)   $ (5,453)
Financing Receivable, Allowance for Credit Loss, Recovery     748   978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,368)   (4,475)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     13,812 13,073 13,073
Financing Receivable, Allowance for Credit Loss, Writeoff     (5,116)   (5,453)
Financing Receivable, Allowance for Credit Loss, Recovery     748   978
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (4,368)   (4,475)
Provision for Loan, Lease, and Other Losses     4,665   5,214
Balance at end of period $ 14,109   $ 14,109   $ 13,812
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 5.37%   5.37%   4.97%
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     $ (13,176)   $ (12,779)
Financing Receivable, Allowance for Credit Loss, Recovery     4,316   4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,860)   (8,758)
Allowance for Credit Losses on Loans [Abstract]          
Balance at beginning of period     94,613 $ 88,565 88,565
Financing Receivable, Allowance for Credit Loss, Writeoff     (13,176)   (12,779)
Financing Receivable, Allowance for Credit Loss, Recovery     4,316   4,021
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     (8,860)   (8,758)
Provision for Loan, Lease, and Other Losses     9,935   14,805
Balance at end of period $ 95,688   $ 95,688   $ 94,613
Financing Receivable, Allowance for Credit Loss to Outstanding, Percent 0.84%   0.84%   0.86%