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Derivative Instruments (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative [Line Items]      
Notional amount $ 57,882,000   $ 46,474,000
Fair value, Derivative assets 998,000   1,944,000
Fair value, Derivative liabilities (998,000)   (1,944,000)
Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount 57,882,000   46,474,000
Net gains (losses) recognized in earnings 0 $ 0  
Interest Rate Lock Commitments [Member]      
Derivative [Line Items]      
Fair value, Derivative assets     18,100,000
Notional amount 745,616,000   1,048,613,000
Fair value, Derivative liabilities $ (613,000)    
Interest Rate Lock Commitments [Member] | Minimum [Member]      
Derivative [Line Items]      
Commitments period 30 days    
Interest Rate Lock Commitments [Member] | Maximum [Member]      
Derivative [Line Items]      
Commitments period 60 days    
TBA Mortgage-Back Securities [Member]      
Derivative [Line Items]      
Fair value, Derivative assets $ 5,734,000    
Posted cash collateral 4,847,000    
Notional amount 552,750,000   506,750,000
Fair value, Derivative liabilities     $ (2,690,000)
CF Bank [Member]      
Derivative [Line Items]      
Pledged, collateral derivatives $ 2,723,000