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Derivative Instruments - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying Amount of the Hedged Assets $ 298,973 $ 0
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (1,027) 0
Derivative assets, notional 435,580  
Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative assets, notional 300,000  
Designated as Hedging Instrument | Interest rate swaps contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative assets, notional 300,000  
Loans held for investment    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying Amount of the Hedged Assets 298,973 0
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (1,027) $ 0
Loans held for investment | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Amortized Cost used in hedging relationships 815,200  
Cumulative basis adjustments associated with hedging relationships $ 1,000