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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, 2023
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (5,501)    
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 38,776 $ 39,776 $ 39,776
Provision for credit losses 1,000   (1,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 39,776   38,776
Allowance for credit losses on loans      
Charge offs (5,501)    
Provision for credit losses 17,971 (3,990)  
Allowance for Loan Losses [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 312,720 280,015 280,015
Charge offs (5,501)   (10,146)
Recoveries 2,212   8,852
Net Charge offs (3,289)   (1,294)
Provision for credit losses 17,000   34,000
Financing Receivable, Allowance for Credit Loss, Ending Balance 326,432   312,720
Allowance for credit losses on loans      
Charge offs (5,501)   (10,146)
Recoveries 2,212   8,852
Net Charge offs (3,289)   (1,294)
Allowance for Loan Losses [Member] | Asset-based lending & equipment finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 6,564 4,182 4,182
Charge offs 0   0
Recoveries 0   0
Net Charge offs 0   0
Provision for credit losses 2   2,382
Financing Receivable, Allowance for Credit Loss, Ending Balance 6,566   6,564
Allowance for credit losses on loans      
Charge offs 0   0
Recoveries 0   0
Net Charge offs 0   0
Allowance for Loan Losses [Member] | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 112,512 85,675 85,675
Charge offs (2,975)   (4,491)
Recoveries 1,216   5,282
Net Charge offs (1,759)   791
Provision for credit losses 6,930   26,047
Financing Receivable, Allowance for Credit Loss, Ending Balance 117,683   112,512
Allowance for credit losses on loans      
Charge offs (2,975)   (4,491)
Recoveries 1,216   5,282
Net Charge offs (1,759)   791
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 9,475 11,473 11,473
Charge offs 0   0
Recoveries 3   13
Net Charge offs 3   13
Provision for credit losses 785   (2,011)
Financing Receivable, Allowance for Credit Loss, Ending Balance 10,263   9,475
Allowance for credit losses on loans      
Charge offs 0   0
Recoveries 3   13
Net Charge offs 3   13
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 128,551 101,330 101,330
Charge offs (2,975)   (4,491)
Recoveries 1,219   5,295
Net Charge offs (1,756)   804
Provision for credit losses 7,717   26,418
Financing Receivable, Allowance for Credit Loss, Ending Balance 134,512   128,551
Allowance for credit losses on loans      
Charge offs (2,975)   (4,491)
Recoveries 1,219   5,295
Net Charge offs (1,756)   804
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 54,398 72,803 72,803
Charge offs 0   (50)
Recoveries 0   50
Net Charge offs 0   0
Provision for credit losses 412   (18,405)
Financing Receivable, Allowance for Credit Loss, Ending Balance 54,809   54,398
Allowance for credit losses on loans      
Charge offs 0   (50)
Recoveries 0   50
Net Charge offs 0   0
Allowance for Loan Losses [Member] | Real estate construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 45,589 37,643 37,643
Charge offs 0   (48)
Recoveries 18   106
Net Charge offs 18   58
Provision for credit losses 3,946   7,887
Financing Receivable, Allowance for Credit Loss, Ending Balance 49,552   45,589
Allowance for credit losses on loans      
Charge offs 0   (48)
Recoveries 18   106
Net Charge offs 18   58
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 99,986 110,446 110,446
Charge offs 0   (98)
Recoveries 18   156
Net Charge offs 18   58
Provision for credit losses 4,357   (10,518)
Financing Receivable, Allowance for Credit Loss, Ending Balance 104,362   99,986
Allowance for credit losses on loans      
Charge offs 0   (98)
Recoveries 18   156
Net Charge offs 18   58
Allowance for Loan Losses [Member] | Total commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 228,538 211,776 211,776
Charge offs (2,975)   (4,588)
Recoveries 1,237   5,451
Net Charge offs (1,738)   862
Provision for credit losses 12,075   15,900
Financing Receivable, Allowance for Credit Loss, Ending Balance 238,874   228,538
Allowance for credit losses on loans      
Charge offs (2,975)   (4,588)
Recoveries 1,237   5,451
Net Charge offs (1,738)   862
Allowance for Loan Losses [Member] | Residential mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 38,298 40,787 40,787
Charge offs (168)   (567)
Recoveries 114   908
Net Charge offs (53)   341
Provision for credit losses 851   (2,830)
Financing Receivable, Allowance for Credit Loss, Ending Balance 39,096   38,298
Allowance for credit losses on loans      
Charge offs (168)   (567)
Recoveries 114   908
Net Charge offs (53)   341
Allowance for Loan Losses [Member] | Auto finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 19,619 1,999 1,999
Charge offs (1,103)   (1,041)
Recoveries 147   98
Net Charge offs (957)   (943)
Provision for credit losses 3,531   18,563
Financing Receivable, Allowance for Credit Loss, Ending Balance 22,193   19,619
Allowance for credit losses on loans      
Charge offs (1,103)   (1,041)
Recoveries 147   98
Net Charge offs (957)   (943)
Allowance for Loan Losses [Member] | Home equity      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 14,875 14,011 14,011
Charge offs (111)   (587)
Recoveries 451   1,385
Net Charge offs 340   798
Provision for credit losses (442)   66
Financing Receivable, Allowance for Credit Loss, Ending Balance 14,774   14,875
Allowance for credit losses on loans      
Charge offs (111)   (587)
Recoveries 451   1,385
Net Charge offs 340   798
Allowance for Loan Losses [Member] | Other consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 11,390 11,441 11,441
Charge offs (1,144)   (3,363)
Recoveries 263   1,010
Net Charge offs (881)   (2,353)
Provision for credit losses 986   2,301
Financing Receivable, Allowance for Credit Loss, Ending Balance 11,495   11,390
Allowance for credit losses on loans      
Charge offs (1,144)   (3,363)
Recoveries 263   1,010
Net Charge offs (881)   (2,353)
Allowance for Loan Losses [Member] | Total consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Beginning Balance 84,182 68,239 68,239
Charge offs (2,525)   (5,558)
Recoveries 975   3,401
Net Charge offs (1,550)   (2,157)
Provision for credit losses 4,925   18,100
Financing Receivable, Allowance for Credit Loss, Ending Balance 87,557   84,182
Allowance for credit losses on loans      
Charge offs (2,525)   (5,558)
Recoveries 975   3,401
Net Charge offs (1,550)   (2,157)
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 39,776 39,776
Provision for credit losses 1,000   (1,000)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 39,776   38,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Asset-based lending & equipment finance      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Off-Balance-Sheet, Credit Loss, Liability, Beginning Balance 601 857 857
Provision for credit losses (103)   (256)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 498   601
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 12,396 17,601 17,601
Provision for credit losses (123)   (5,205)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 12,273   12,396
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 103 208 208
Provision for credit losses 146   (105)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 249   103
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 13,101 18,667 18,667
Provision for credit losses (80)   (5,566)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 13,020   13,101
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 710 936 936
Provision for credit losses 159   (226)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 868   710
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 20,583 15,586 15,586
Provision for credit losses 963   4,997
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 21,546   20,583
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 21,292 16,522 16,522
Provision for credit losses 1,122   4,770
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 22,414   21,292
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 34,393 35,189 35,189
Provision for credit losses 1,041   (796)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 35,435   34,393
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 2,699 2,592 2,592
Provision for credit losses (8)   107
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 2,691   2,699
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 1,683 1,995 1,995
Provision for credit losses (34)   (311)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 1,650   1,683
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 4,382 4,587 4,587
Provision for credit losses (41)   (204)
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance 4,341   4,382
Allowance for Loans Losses and Unfunded Commitments [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs (5,501)   (10,146)
Recoveries 2,212   8,852
Net Charge offs (3,289)   (1,294)
Allowance for credit losses on loans      
Balance at beginning of period 351,496 319,791 319,791
Charge offs (5,501)   (10,146)
Recoveries 2,212   8,852
Net Charge offs (3,289)   (1,294)
Provision for credit losses 18,000   33,000
Balance at end of period $ 366,208   $ 351,496
Percent of Loans 1.25%   1.22%
Allowance for Loans Losses and Unfunded Commitments [Member] | Asset-based lending & equipment finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ 0
Recoveries 0   0
Net Charge offs 0   0
Allowance for credit losses on loans      
Balance at beginning of period 7,165 5,040 5,040
Charge offs 0   0
Recoveries 0   0
Net Charge offs 0   0
Provision for credit losses (102)   2,125
Balance at end of period $ 7,063   $ 7,165
Percent of Loans 1.35%   1.56%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (2,975)   $ (4,491)
Recoveries 1,216   5,282
Net Charge offs (1,759)   791
Allowance for credit losses on loans      
Balance at beginning of period 124,908 103,276 103,276
Charge offs (2,975)   (4,491)
Recoveries 1,216   5,282
Net Charge offs (1,759)   791
Provision for credit losses 6,808   20,842
Balance at end of period $ 129,957   $ 124,908
Percent of Loans 1.39%   1.34%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ 0
Recoveries 3   13
Net Charge offs 3   13
Allowance for credit losses on loans      
Balance at beginning of period 9,579 11,681 11,681
Charge offs 0   0
Recoveries 3   13
Net Charge offs 3   13
Provision for credit losses 931   (2,115)
Balance at end of period $ 10,513   $ 9,579
Percent of Loans 1.00%   0.97%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (2,975)   $ (4,491)
Recoveries 1,219   5,295
Net Charge offs (1,756)   804
Allowance for credit losses on loans      
Balance at beginning of period 141,652 119,997 119,997
Charge offs (2,975)   (4,491)
Recoveries 1,219   5,295
Net Charge offs (1,756)   804
Provision for credit losses 7,637   20,852
Balance at end of period $ 147,533   $ 141,652
Percent of Loans 1.35%   1.32%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ (50)
Recoveries 0   50
Net Charge offs 0   0
Allowance for credit losses on loans      
Balance at beginning of period 55,108 73,739 73,739
Charge offs 0   (50)
Recoveries 0   50
Net Charge offs 0   0
Provision for credit losses 570   (18,631)
Balance at end of period $ 55,678   $ 55,108
Percent of Loans 1.09%   1.08%
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ (48)
Recoveries 18   106
Net Charge offs 18   58
Allowance for credit losses on loans      
Balance at beginning of period 66,171 53,229 53,229
Charge offs 0   (48)
Recoveries 18   106
Net Charge offs 18   58
Provision for credit losses 4,909   12,884
Balance at end of period $ 71,098   $ 66,171
Percent of Loans 3.31%   3.07%
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ 0   $ (98)
Recoveries 18   156
Net Charge offs 18   58
Allowance for credit losses on loans      
Balance at beginning of period 121,279 126,968 126,968
Charge offs 0   (98)
Recoveries 18   156
Net Charge offs 18   58
Provision for credit losses 5,479   (5,748)
Balance at end of period $ 126,776   $ 121,279
Percent of Loans 1.75%   1.68%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (2,975)   $ (4,588)
Recoveries 1,237   5,451
Net Charge offs (1,738)   862
Allowance for credit losses on loans      
Balance at beginning of period 262,931 246,965 246,965
Charge offs (2,975)   (4,588)
Recoveries 1,237   5,451
Net Charge offs (1,738)   862
Provision for credit losses 13,116   15,104
Balance at end of period $ 274,309   $ 262,931
Percent of Loans 1.51%   1.46%
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (168)   $ (567)
Recoveries 114   908
Net Charge offs (53)   341
Allowance for credit losses on loans      
Balance at beginning of period 38,298 40,787 40,787
Charge offs (168)   (567)
Recoveries 114   908
Net Charge offs (53)   341
Provision for credit losses 851   (2,830)
Balance at end of period $ 39,096   $ 38,298
Percent of Loans 0.45%   0.45%
Allowance for Loans Losses and Unfunded Commitments [Member] | Auto finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (1,103)   $ (1,041)
Recoveries 147   98
Net Charge offs (957)   (943)
Allowance for credit losses on loans      
Balance at beginning of period 19,619 1,999 1,999
Charge offs (1,103)   (1,041)
Recoveries 147   98
Net Charge offs (957)   (943)
Provision for credit losses 3,531   18,563
Balance at end of period $ 22,193   $ 19,619
Percent of Loans 1.43%   1.42%
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (111)   $ (587)
Recoveries 451   1,385
Net Charge offs 340   798
Allowance for credit losses on loans      
Balance at beginning of period 17,574 16,603 16,603
Charge offs (111)   (587)
Recoveries 451   1,385
Net Charge offs 340   798
Provision for credit losses (449)   173
Balance at end of period $ 17,465   $ 17,574
Percent of Loans 2.86%   2.81%
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (1,144)   $ (3,363)
Recoveries 263   1,010
Net Charge offs (881)   (2,353)
Allowance for credit losses on loans      
Balance at beginning of period 13,073 13,436 13,436
Charge offs (1,144)   (3,363)
Recoveries 263   1,010
Net Charge offs (881)   (2,353)
Provision for credit losses 952   1,990
Balance at end of period $ 13,145   $ 13,073
Percent of Loans 4.71%   4.43%
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Charge offs $ (2,525)   $ (5,558)
Recoveries 975   3,401
Net Charge offs (1,550)   (2,157)
Allowance for credit losses on loans      
Balance at beginning of period 88,565 $ 72,825 72,825
Charge offs (2,525)   (5,558)
Recoveries 975   3,401
Net Charge offs (1,550)   (2,157)
Provision for credit losses 4,884   17,896
Balance at end of period $ 91,898   $ 88,565
Percent of Loans 0.83%   0.82%