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FAIR VALUE - Narrative (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value option, aggregate fair value exceeded principle amount $ 407,000   $ 407,000    
Increase (decrease) in fair value     76,417,000 $ 43,471,000  
Specific charges to value the real estate owned 0 $ 0 0 0  
Changes in fair value of OREO still held 0 0 0 0  
Reserve for mortgage servicing rights 890,000   890,000   $ 70,000
Mortgage servicing rights impairment $ 317,000 $ 0 820,000 $ 0  
Interest Rate Lock Commitments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Increase (decrease) in fair value     $ 57,000    
Level 3 | Measurement Input, Pull Through Increase (Decrease) | Interest Rate Lock Commitments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Asset, measurement input (percent) 0.05   0.05    
Level 3 | Measurement Input, Pull Through | Interest Rate Lock Commitments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Asset, measurement input (percent) 0.93   0.93    
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value liabilities $ 0   $ 0   $ 0