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Allowance for Credit Losses (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     $ 204,809  
Balance at end of period $ 180,872 $ 235,313 180,872 $ 235,313
Commercial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at end of period 44,406 88,644 44,406 88,644
Mortgage Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at end of period 47,257 50,031 47,257 50,031
Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at end of period 17,885 27,233 17,885 27,233
Auto Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at end of period 71,324 69,405 71,324 69,405
Non-PCD [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 148,314 151,507 161,015 85,044
Provision for credit losses (2,148) 13,358 (6,764) 70,934
Charge-offs (15,037) (15,591) (38,432) (57,017)
Recoveries 7,745 7,135 23,055 18,250
Balance at end of period 138,874 156,409 138,874 156,409
Non-PCD [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 43,523 43,011 45,779 25,993
Provision for credit losses (3,323) (1,771) (6,284) 13,799
Charge-offs (7,518) (298) (8,238) (4,566)
Recoveries 558 253 1,983 2,407
Balance at end of period 33,240 41,195 33,240 41,195
Non-PCD [Member] | Mortgage Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 16,368 19,973 19,687 8,727
Provision for credit losses 240 (564) (2,831) 47
Charge-offs (160) (56) (1,216) (659)
Recoveries 419 269 1,227 527
Balance at end of period 16,867 19,622 16,867 19,622
Non-PCD [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 19,065 31,954 25,253 18,446
Provision for credit losses 259 (378) 174 13,827
Charge-offs (2,370) (5,114) (9,736) (15,316)
Recoveries 894 663 2,157 1,750
Balance at end of period 17,848 27,125 17,848 27,125
Non-PCD [Member] | Auto Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 69,358 56,569 70,296 31,878
Provision for credit losses 676 16,071 2,177 43,261
Charge-offs (4,989) (10,123) (19,242) (36,476)
Recoveries 5,874 5,950 17,688 13,566
Balance at end of period 70,919 68,467 70,919 68,467
Non-PCD [Member] | Accounting Standards Update 2016-13 [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       39,198
Non-PCD [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       3,562
Non-PCD [Member] | Accounting Standards Update 2016-13 [Member] | Mortgage Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       10,980
Non-PCD [Member] | Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       8,418
Non-PCD [Member] | Accounting Standards Update 2016-13 [Member] | Auto Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       16,238
PCD [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 43,403 81,194 43,794 31,495
Provision for credit losses (2,646) (176) 100 8,473
Charge-offs (1,200) (2,505) (6,286) (14,004)
Recoveries 2,441 391 4,390 2,418
Balance at end of period 41,998 78,904 41,998 78,904
PCD [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 12,756 48,913 16,405 8,893
Provision for credit losses (2,838) (1,262) (7,304) (1,303)
Charge-offs (68) (293) (118) (3,036)
Recoveries 1,316 91 2,183 752
Balance at end of period 11,166 47,449 11,166 47,449
PCD [Member] | Mortgage Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 30,108 30,920 26,389 21,655
Provision for credit losses 649 1,077 8,370 9,131
Charge-offs (1,008) (1,677) (5,340) (8,998)
Recoveries 641 89 971 791
Balance at end of period 30,390 30,409 30,390 30,409
PCD [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 38 169 57 0
Provision for credit losses (220) 0 (272) 356
Charge-offs 0 (61) (22) (521)
Recoveries 219 0 274 92
Balance at end of period 37 108 37 108
PCD [Member] | Auto Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 501 1,192 943 947
Provision for credit losses (237) 9 (694) 289
Charge-offs (124) (474) (806) (1,449)
Recoveries 265 211 962 783
Balance at end of period $ 405 $ 938 $ 405 938
PCD [Member] | Accounting Standards Update 2016-13 [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       50,522
PCD [Member] | Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       42,143
PCD [Member] | Accounting Standards Update 2016-13 [Member] | Mortgage Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       7,830
PCD [Member] | Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       181
PCD [Member] | Accounting Standards Update 2016-13 [Member] | Auto Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Impact of ASC 326 adoption       $ 368