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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Jun. 02, 2010
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Leverage ratio 12.34% 8.00%
Tier 1 risk based capital ratio 17.30% 10.00%
Total Risk Based Capital Ratio 18.57% 12.00%
Tier 1 risk based capital ratio to be considered well capitalzed under PCA 6.00%  
Leverage Ratio 3.00%  
Leverage Ratio Composite Rating 1.00%  
Four Major Risk Weightings Categories (0%, 20%, 50% and 100%)  
Commitments To Extend Credit [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Commitments $ 1,100.0  
Credit Cards [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Commitments 648.4  
Commercial And Financial Standby Letters Of Credit [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Commitments 47.0  
Minimum [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Percentage of risk weighted assets 0.00%  
Maximum [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Percentage of risk weighted assets 100.00%  
Well Capitalized [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Total Risk Based Capital Ratio 10.00%  
Basel III [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Common Equity Tier 1 Capital Conservation Buffer 2.50%  
Common Equity Tier 1 Capital Conservation Buffer First Year 0.625%  
Trust Preferred Securities $ 225  
Percentage Of Trust Preferred Securities That Qualify As Tier 1 Capital 25.00%  
Risk Weightings 150.00%  
Credit Conversion Factor 20.00%  
Basel III [Member] | Minimum [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Tier 1 risk based capital ratio to be considered well capitalzed under PCA 8.00%  
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%  
Basel III [Member] | Maximum [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Threshold For Deductions Of Certain Items From Common Equity Tier 1 Capital 10.00%  
Threshold For Total Deductions From Common Equity Tier 1 Capital 15.00%  
Basel III [Member] | Well Capitalized [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Tier 1 Common equity ratio to be considered well capitalized 6.50%  
Leverage Ratio 5.00%  
FirstBank [Member]
   
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Leverage ratio 12.10%  
Tier 1 risk based capital ratio 16.95%  
Total Risk Based Capital Ratio 18.21%