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Allowance for Credit Losses (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 204,809 $ 116,539  
Balance at end of period 155,937 204,809 $ 116,539
Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 62,184 34,886  
Balance at end of period 36,770 62,184 34,886
Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 46,076 30,382  
Balance at end of period 34,317 46,076 30,382
Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 25,310 18,446  
Balance at end of period 19,175 25,310 18,446
Auto and leasing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 71,239 32,825  
Balance at end of period 65,675 71,239 32,825
Loans Accounted For Under ASC 310-30 Excluded      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   85,044 97,250
(Recapture) provision for credit losses     62,533
Charge-offs     (98,693)
Recoveries     23,954
Balance at end of period     85,044
Loans Accounted For Under ASC 310-30 Excluded | Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   25,993 30,348
(Recapture) provision for credit losses     6,731
Charge-offs     (12,196)
Recoveries     1,110
Balance at end of period     25,993
Loans Accounted For Under ASC 310-30 Excluded | Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   8,727 19,783
(Recapture) provision for credit losses     5,975
Charge-offs     (18,564)
Recoveries     1,533
Balance at end of period     8,727
Loans Accounted For Under ASC 310-30 Excluded | Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   18,446 17,476
(Recapture) provision for credit losses     19,038
Charge-offs     (20,435)
Recoveries     2,367
Balance at end of period     18,446
Loans Accounted For Under ASC 310-30 Excluded | Auto and leasing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   31,878 29,643
(Recapture) provision for credit losses     30,789
Charge-offs     (47,498)
Recoveries     18,944
Balance at end of period     31,878
Loans Accounted Under ASC 310-30      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   31,495 66,981
(Recapture) provision for credit losses     34,259
Allowance derecognition     (69,745)
Balance at end of period     31,495
Loans Accounted Under ASC 310-30 | Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   8,893 30,226
(Recapture) provision for credit losses     13,484
Allowance derecognition     (34,817)
Balance at end of period     8,893
Loans Accounted Under ASC 310-30 | Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   21,655 30,607
(Recapture) provision for credit losses     23,703
Allowance derecognition     (32,655)
Balance at end of period     21,655
Loans Accounted Under ASC 310-30 | Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   0 4
(Recapture) provision for credit losses     0
Allowance derecognition     (4)
Balance at end of period     0
Loans Accounted Under ASC 310-30 | Auto and leasing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   947 6,144
(Recapture) provision for credit losses     (2,928)
Allowance derecognition     (2,269)
Balance at end of period     947
Non-PCD      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 161,015 85,044  
(Recapture) provision for credit losses (6,877) 86,532  
Charge-offs (52,987) (76,182)  
Recoveries 30,914 26,423  
Balance at end of period 132,065 161,015 85,044
Non-PCD | Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 45,779 25,993  
(Recapture) provision for credit losses (7,130) 18,462  
Charge-offs (8,788) (4,979)  
Recoveries 2,401 2,741  
Balance at end of period 32,262 45,779 25,993
Non-PCD | Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 19,687 8,727  
(Recapture) provision for credit losses (242) 258  
Charge-offs (5,789) (884)  
Recoveries 1,643 606  
Balance at end of period 15,299 19,687 8,727
Non-PCD | Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 25,253 18,446  
(Recapture) provision for credit losses 2,868 16,579  
Charge-offs (11,880) (21,772)  
Recoveries 2,900 3,582  
Balance at end of period 19,141 25,253 18,446
Non-PCD | Auto and leasing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 70,296 31,878  
(Recapture) provision for credit losses (2,373) 51,233  
Charge-offs (26,530) (48,547)  
Recoveries 23,970 19,494  
Balance at end of period 65,363 70,296 31,878
Non-PCD | Impact of ASC 326 adoption      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   39,198  
Balance at end of period     39,198
Non-PCD | Impact of ASC 326 adoption | Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   3,562  
Balance at end of period     3,562
Non-PCD | Impact of ASC 326 adoption | Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   10,980  
Balance at end of period     10,980
Non-PCD | Impact of ASC 326 adoption | Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   8,418  
Balance at end of period     8,418
Non-PCD | Impact of ASC 326 adoption | Auto and leasing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   16,238  
Balance at end of period     16,238
PCD      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 43,794 31,495  
(Recapture) provision for credit losses 7,760 7,185  
Charge-offs (33,559) (49,004)  
Recoveries 5,877 3,596  
Balance at end of period 23,872 43,794 31,495
PCD | Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 16,405 8,893  
(Recapture) provision for credit losses (2,585) 480  
Charge-offs (12,241) (36,097)  
Recoveries 2,929 986  
Balance at end of period 4,508 16,405 8,893
PCD | Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 26,389 21,655  
(Recapture) provision for credit losses 11,556 6,392  
Charge-offs (20,350) (10,342)  
Recoveries 1,423 854  
Balance at end of period 19,018 26,389 21,655
PCD | Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 57 0  
(Recapture) provision for credit losses (317) 126  
Charge-offs (22) (542)  
Recoveries 316 292  
Balance at end of period 34 57 0
PCD | Auto and leasing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 943 947  
(Recapture) provision for credit losses (894) 187  
Charge-offs (946) (2,023)  
Recoveries 1,209 1,464  
Balance at end of period $ 312 943 947
PCD | Impact of ASC 326 adoption      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   50,522  
Balance at end of period     50,522
PCD | Impact of ASC 326 adoption | Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   42,143  
Balance at end of period     42,143
PCD | Impact of ASC 326 adoption | Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   7,830  
Balance at end of period     7,830
PCD | Impact of ASC 326 adoption | Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   181  
Balance at end of period     181
PCD | Impact of ASC 326 adoption | Auto and leasing      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period   $ 368  
Balance at end of period     $ 368