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FAIR VALUE - Impairment of Valuation Adjustments were Recorded for Assets Recognized at Fair Value (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Servicing Asset at Fair Value, Amount $ 32,304   $ 32,304   $ 27,191 $ 25,255 $ 26,502 $ 26,244
Fair Value Measurements Nonrecurring [Member] | OREO [Member]                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Assets Fair Value Adjustment (3,244) $ (818) (9,817) $ (7,563)        
Fair Value Measurements Nonrecurring [Member] | Mortgage Servicing Rights [Member]                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Assets Fair Value Adjustment   (690)   (1,047)        
Fair Value Measurements Nonrecurring [Member] | Loans Held For Sale [Member]                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Assets Fair Value Adjustment (10,102)   (14,642)          
Fair Value Measurements Nonrecurring [Member] | Loans Receivable [Member]                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Assets Fair Value Adjustment (7,967) (686) (20,622) (23,467)        
Fair Value Inputs Level 1 [Member] | Fair Value Measurements Nonrecurring [Member]                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Loans receivable 0 0 0 0        
Other Real Estate Owned 0 0 0 0        
Servicing Asset at Fair Value, Amount   0   0        
Loans held for sale 0   0          
Fair Value Inputs Level 2 [Member] | Fair Value Measurements Nonrecurring [Member]                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Loans receivable 0 0 0 0        
Other Real Estate Owned 0 0 0 0        
Servicing Asset at Fair Value, Amount   0   0        
Loans held for sale 0   0          
Fair Value Inputs Level 3 [Member] | Fair Value Measurements Nonrecurring [Member]                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Loans receivable 442,248 374,740 442,248 374,740        
Other Real Estate Owned 135,218 152,977 135,218 152,977        
Servicing Asset at Fair Value, Amount   $ 25,999   $ 25,999        
Loans held for sale $ 44,177   $ 44,177