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Allowance for Credit Losses (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period $ 116,539 $ 164,231  
Provision for credit losses     $ 56,108
Balance at end of period 204,809 116,539 164,231
Non-PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 85,044    
Impact of ASC 326 adoption 39,198    
Provision for credit losses 86,532    
Charge-offs (76,182)    
Recoveries 26,423    
Balance at end of period 161,015 85,044  
PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 31,495    
Impact of ASC 326 adoption 50,522    
Provision for credit losses 7,185    
Charge-offs (49,004)    
Recoveries 3,596    
Balance at end of period 43,794 31,495  
Commercial Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 34,886 60,574  
Balance at end of period 62,184 34,886 60,574
Commercial Loan [Member] | Non-PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 25,993    
Impact of ASC 326 adoption 3,562    
Provision for credit losses 18,462    
Charge-offs (4,979)    
Recoveries 2,741    
Balance at end of period 45,779 25,993  
Commercial Loan [Member] | PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 8,893    
Impact of ASC 326 adoption 42,143    
Provision for credit losses 480    
Charge-offs (36,097)    
Recoveries 986    
Balance at end of period 16,405 8,893  
Mortgage Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 30,382 50,390  
Balance at end of period 46,076 30,382 50,390
Mortgage Loan [Member] | Non-PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 8,727    
Impact of ASC 326 adoption 10,980    
Provision for credit losses 258    
Charge-offs (884)    
Recoveries 606    
Balance at end of period 19,687 8,727  
Mortgage Loan [Member] | PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 21,655    
Impact of ASC 326 adoption 7,830    
Provision for credit losses 6,392    
Charge-offs (10,342)    
Recoveries 854    
Balance at end of period 26,389 21,655  
Consumer Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 18,446 17,480  
Balance at end of period 25,310 18,446 17,480
Consumer Loan [Member] | Non-PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 18,446    
Impact of ASC 326 adoption 8,418    
Provision for credit losses 16,579    
Charge-offs (21,772)    
Recoveries 3,582    
Balance at end of period 25,253 18,446  
Consumer Loan [Member] | PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 0    
Impact of ASC 326 adoption 181    
Provision for credit losses 126    
Charge-offs (542)    
Recoveries 292    
Balance at end of period 57 0  
Auto Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 32,825 35,787  
Balance at end of period 71,239 32,825 35,787
Auto Loan [Member] | Non-PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 31,878    
Impact of ASC 326 adoption 16,238    
Provision for credit losses 51,233    
Charge-offs (48,547)    
Recoveries 19,494    
Balance at end of period 70,296 31,878  
Auto Loan [Member] | PCD [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 947    
Impact of ASC 326 adoption 368    
Provision for credit losses 187    
Charge-offs (2,023)    
Recoveries 1,464    
Balance at end of period 943 947  
Loans Accounted For Under ASC 310-30 Excluded [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 85,044 97,250 96,580
Provision for credit losses   62,533 51,764
Charge-offs   (98,693) (75,230)
Recoveries   23,954 24,136
Balance at end of period   85,044 97,250
Loans Accounted For Under ASC 310-30 Excluded [Member] | Commercial Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 25,993 30,348 30,300
Provision for credit losses   6,731 6,159
Charge-offs   (12,196) (6,788)
Recoveries   1,110 677
Balance at end of period   25,993 30,348
Loans Accounted For Under ASC 310-30 Excluded [Member] | Mortgage Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 8,727 19,783 20,439
Provision for credit losses   5,975 3,594
Charge-offs   (18,564) (5,297)
Recoveries   1,533 1,047
Balance at end of period   8,727 19,783
Loans Accounted For Under ASC 310-30 Excluded [Member] | Consumer Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 18,446 17,476 19,679
Provision for credit losses   19,038 15,648
Charge-offs   (20,435) (20,088)
Recoveries   2,367 2,237
Balance at end of period   18,446 17,476
Loans Accounted For Under ASC 310-30 Excluded [Member] | Auto Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 31,878 29,643 26,162
Provision for credit losses   30,789 26,363
Charge-offs   (47,498) (43,057)
Recoveries   18,944 20,175
Balance at end of period   31,878 29,643
Loans Accounted Under ASC 310-30 [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 31,495 66,981 70,929
Provision for credit losses   34,259 (4,353)
Allowance de-recognition   (69,745) (8,301)
Balance at end of period   31,495 66,981
Loans Accounted Under ASC 310-30 [Member] | Commercial Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 8,893 30,226 33,674
Provision for credit losses   13,484 (2,121)
Allowance de-recognition   (34,817) (5,569)
Balance at end of period   8,893 30,226
Loans Accounted Under ASC 310-30 [Member] | Mortgage Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 21,655 30,607 29,272
Provision for credit losses   23,703 (3,137)
Allowance de-recognition   (32,655) (1,802)
Balance at end of period   21,655 30,607
Loans Accounted Under ASC 310-30 [Member] | Consumer Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 0 4 22
Provision for credit losses   0 18
Allowance de-recognition   (4) 0
Balance at end of period   0 4
Loans Accounted Under ASC 310-30 [Member] | Auto Loan [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period $ 947 6,144 7,961
Provision for credit losses   (2,928) 887
Allowance de-recognition   (2,269) (930)
Balance at end of period   $ 947 $ 6,144