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Derivative Instruments (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount $ 32,815,000   $ 12,039,000
Fair value, Derivative assets 2,069,000   12,000
Posted cash collateral 2,392,000    
Net gains (losses) recognized in earnings 0 $ 0  
Interest Rate Commitments [Member]      
Derivative [Line Items]      
Fair value, Derivative assets 21,703,000   3,104,000
Notional amount 923,043,000   297,454,000
Interest Rate Lock Commitments [Member]      
Derivative [Line Items]      
Notional amount 923,043,000   297,454,000
Fair value, Derivative assets $ 21,703,000   3,104,000
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]      
Notional amount $ 675,000,000   225,500,000
Posted cash collateral 2,192,000    
Notional amount 675,000,000   225,500,000
Fair value (2,070,000)   $ (350,000)
CF Bank [Member]      
Derivative [Line Items]      
Pledged, collateral derivatives $ 2,451,000