XML 163 R147.htm IDEA: XBRL DOCUMENT v3.8.0.1
DEPOSITS - Summary of Deposits Balance (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Interest Bearing Deposit [Member] | Minimum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 0.05% 0.05%
Interest Bearing Deposit [Member] | Maximum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 1.00% 1.00%
Savings Deposits [Member] | Minimum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 0.05% 0.05%
Savings Deposits [Member] | Maximum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 0.40% 0.40%
Certificate Of Deposits [Member] | Minimum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 0.10% 0.10%
Certificate Of Deposits [Member] | Maximum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 4.00% 4.00%
Brokered Certificate of Deposits [Member] | Minimum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 0.85% 0.60%
Brokered Certificate of Deposits [Member] | Maximum [Member]    
Deposits [Line Items]    
Deposits Stated Interest Rate 2.80% 2.80%