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Regulatory Capital Requirements - Required Ratios (Details)
Jan. 01, 2019
Mortgage Banking [Abstract]  
Minimum ratio of Common Equity Tier 1 capital to risk-weighed assets 4.50%
Minimum ratio of Common Equity Tier 1 capital to risk-weighed assets, capital conservation buffer 2.50%
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent) 7.00%
Minimum ratio of Tier 1 capital to risk-weighted assets 6.00%
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent) 0.085
Minimum ratio of Total capital to risk-weighted assets 8.00%
Capital Required for Capital Adequacy to Risk Weighted Assets 0.105
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent) 0.040