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Loans and Leases and the Allowance for Credit Losses - Schedule of Activity in Allowance by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Allowance for Credit Losses:        
Balance at Beginning of Period $ 180,385 $ 173,439 $ 216,252 $ 110,027
Loans and Leases Charged-Off (3,445) (2,347) (14,045) (17,807)
Recoveries on Loans and Leases Previously Charged-Off 2,252 3,804 8,752 10,413
Net Loans and Leases Recovered (Charged-Off) (1,193) 1,457 (5,293) (7,394)
Provision for Credit Losses (11,272) 28,600 (43,039) 102,600
Balance at End of Period 167,920 203,496 167,920 203,496
CECL Adoption Impact | Accounting Standards Update 2016-13        
Allowance for Credit Losses:        
Balance at Beginning of Period       (1,737)
January 1, 2020 | Accounting Standards Update 2016-13        
Allowance for Credit Losses:        
Balance at Beginning of Period       108,290
Commercial        
Allowance for Credit Losses:        
Balance at Beginning of Period 78,639 72,522 84,847 73,801
Loans and Leases Charged-Off (196) (171) (900) (1,520)
Recoveries on Loans and Leases Previously Charged-Off 118 231 374 2,084
Net Loans and Leases Recovered (Charged-Off) (78) 60 (526) 564
Provision for Credit Losses (9,894) 7,685 (15,654) 24,691
Balance at End of Period 68,667 80,267 68,667 80,267
Commercial | CECL Adoption Impact | Accounting Standards Update 2016-13        
Allowance for Credit Losses:        
Balance at Beginning of Period       (18,789)
Commercial | January 1, 2020 | Accounting Standards Update 2016-13        
Allowance for Credit Losses:        
Balance at Beginning of Period       55,012
Consumer        
Allowance for Credit Losses:        
Balance at Beginning of Period 101,746 100,917 131,405 36,226
Loans and Leases Charged-Off (3,249) (2,176) (13,145) (16,287)
Recoveries on Loans and Leases Previously Charged-Off 2,134 3,573 8,378 8,329
Net Loans and Leases Recovered (Charged-Off) (1,115) 1,397 (4,767) (7,958)
Provision for Credit Losses (1,378) 20,915 (27,385) 77,909
Balance at End of Period $ 99,253 $ 123,229 $ 99,253 123,229
Consumer | CECL Adoption Impact | Accounting Standards Update 2016-13        
Allowance for Credit Losses:        
Balance at Beginning of Period       17,052
Consumer | January 1, 2020 | Accounting Standards Update 2016-13        
Allowance for Credit Losses:        
Balance at Beginning of Period       $ 53,278