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Legal Proceedings, Contingencies and Commitments - Narrative (Details) - USD ($)
Feb. 24, 2012
Mar. 31, 2020
Dec. 31, 2019
Aug. 30, 2018
Dec. 31, 2013
Loss Contingencies          
Tier 1 capital (to adjusted tangible assets), capitalized under prompt corrective action provision ratio   5.00% 5.00%    
Tier 1 capital (to adjusted tangible assets), actual ratio   8.09% 7.57%    
Business acquisition threshold   33.30%      
Accrued reserve for contingent liabilities   $ 3,000,000 $ 3,000,000    
Letter of credit, reserve, amount     $ 0    
Bank          
Loss Contingencies          
Tier 1 capital (to adjusted tangible assets), capitalized under prompt corrective action provision ratio   5.00% 5.00%    
Tier 1 capital (to adjusted tangible assets), actual ratio   8.19% 7.71%    
DOJ Agreement | Bank          
Loss Contingencies          
Tier 1 capital (to adjusted tangible assets), capitalized under prompt corrective action provision ratio         11.00%
DOJ Agreement          
Loss Contingencies          
Litigation settlement payment amount $ 118,000,000        
Accrued reserve for contingent liabilities     $ 35,000,000    
DOJ Agreement | Subsequent Payments          
Loss Contingencies          
Litigation expense (up to) $ 25,000,000        
CEO | SERP          
Loss Contingencies          
SERP Liability   $ 16,000,000   $ 16,000,000