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FAIR VALUE - Narrative (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
security
bank
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of investment securities sold | security     18    
Fair value option, aggregate fair value exceeded principle amount $ 151   $ 151    
Increase (decrease) in fair value     150,652 $ 147,647  
Impairment reserve (recovery) for mortgage servicing rights 372   372   $ 1,100
Impairment charges (reversal) $ 43 $ 166 (695) $ 986  
Interest rate lock commitments on residential mortgages          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Increase (decrease) in fair value     $ 26    
Level 3 | Municipal Bonds          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of investment securities | security 1   1    
Level 3 | Collateralized Mortgage Obligations          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of investment securities | security 1   1   3
Number of investment securities sold | security     1    
Number of investment securities called | bank     1    
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) 0.89   0.89    
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