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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Percentage Of Increase In ACL Adjusted In Capital Measures   25.00%  
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
FHA/VA mortgage loan production sold into GNMA mortgage-backed securities $ 221,500   $ 235,300
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Cumulative Effect Of New Accounting Principle In Period Of Adoption 1   $ (62,322)  
Basel III [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Capital Conservation Buffer 2.50%    
Basel III [Member] | Minimum [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Common Equity Tier 1 Captial (to Risk-Weighted Assets) Required For Captial Adequacy Ratio 4.50%    
Common equity tier 1 capital to risk weight assets ratio plus common equity tier1 capital conservation buffer 7.00%    
Tier 1 Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio 0.060    
Total Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 8.50%    
Total Capital (to Risk-Weighted Assets) Required For Capital Adequacy Ratio 0.080    
Leverage Ratio Required For Capital Adequancy Ratio 0.04