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FAIR VALUE - Narrative (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
bank
Mar. 31, 2021
bank
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
security
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Number of investment securities | security       14    
Fair value option, aggregate fair value exceeded principle amount $ 200     $ 200    
Increase (decrease) in fair value       104,190 $ 76,417  
Impairment reserve for mortgage servicing rights 415     415   $ 1,100
Impairment charges (reversal) $ 45   $ 319 (651) $ 820  
Interest rate lock commitments on residential mortgages            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Increase (decrease) in fair value       $ 25    
Level 3 | Collateralized Mortgage Obligations            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Number of investment securities | bank 1 3        
Level 3 | Measurement Input, Pull Through | Interest rate lock commitments on residential mortgages            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Asset, measurement input (percent) 0.88     0.88    
Level 3 | Measurement Input, Pull Through Increase (Decrease) | Interest rate lock commitments on residential mortgages            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Asset, measurement input (percent) 0.05     0.05