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Mortgage Banking Activities - Schedule of notional amount and fair value of mortgage banking derivatives (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Derivative asset, fair value $ 2,613 $ 7,620
Derivative liability, fair value 379 4,467
Other assets | Interest rate lock commitments    
Derivative [Line Items]    
Derivative asset, notional amount 128,915 390,676
Derivative asset, fair value 1,579 7,565
Other assets | Mandatory forward sales contracts    
Derivative [Line Items]    
Derivative asset, notional amount 181,000 0
Derivative asset, fair value 1,004 0
Other assets | Best efforts forward sales contracts    
Derivative [Line Items]    
Derivative asset, notional amount 17,447 19,803
Derivative asset, fair value 30 55
Other liabilities | Interest rate lock commitments    
Derivative [Line Items]    
Derivative liability, notional amount 49,287 8,046
Derivative liability, fair value 335 12
Other liabilities | Mandatory forward sales contracts    
Derivative [Line Items]    
Derivative liability, notional amount 23,500 514,000
Derivative liability, fair value $ 44 $ 4,455