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Investments - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2022
USD ($)
security
Sep. 30, 2022
USD ($)
security
Sep. 30, 2022
USD ($)
security
Rate
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
security
Investments, Debt and Equity Securities [Abstract]            
Vertical risk retention interest     5.00% 5.00%    
Payments to acquire trading securities $ 5,000 $ 5,064     $ 0  
Trading investments $ 52,450 $ 52,450 $ 52,450 $ 52,450   $ 37,465
Number of available-for-sale securities with unrealized losses | security 190 190 190 190   60
Number of available-for-sale securities | security 191 191 191 191   180
Par value of mortgage-backed securities pledged to FRB $ 627,000 $ 627,000 $ 627,000 $ 627,000   $ 888,000
Non-marketable securities investment 69,000 69,000 69,000 69,000   69,000
Low income housing tax credit investments 62,000 62,000 62,000 62,000   68,000
Low income housing tax credit investments, liability for unfunded commitments $ 27,000 27,000 $ 27,000 $ 27,000   30,000
Low income housing tax credit investments, tax credits and benefits (less than)   $ 1,000       $ 7,000
Low income housing tax credit investments, expected tax benefits recognized     25.00%