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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Commitments To Extend Credit [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Commitments $ 1,300.0
Commitments To Extend Credit [Member] | Credit Card [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Commitments 658.2
Commitments To Extend Credit [Member] | Commercial And Financial Standby Letters Of Credit [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Commitments $ 52.2
Basel III [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Capital Conservation Buffer 2.50%
Common Equity Tier 1 Capital Conservation Buffer First Year 0.625%
Basel III [Member] | Minimum [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Common Equity Tier1 Capital To Risk Weight Assets Ratio 4.50%
Common Equity Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 7.00%
Total Tier 1 Capital To Risk Weight Assets Ratio 6.00%
Total Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 8.50%
Total Tier 1 Capital And Tier 2 Capital To Risk Weight Assets Ratio 8.00%
Total Tier 1 Capital And Tier 2 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 10.50%
Leverage Ratio 4.00%