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Investment Securities - Narrative (Details)
3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Sep. 01, 2022
USD ($)
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]            
Held-to-maturity, book value     $ 511,000,000      
Fair Value $ 411,018,000   477,000,000 $ 411,018,000    
Available-for-sale to held-to-maturity, transfer unrealized loss     $ 34,000,000      
Proceeds from sales of investment securities, available-for-sale 44,100,000 $ 0   47,175,000 $ 17,559,000  
Gross realized gain on sale 0 0   24,000 209,000  
Gross realized loss on sale $ 96,000 $ 0   $ 96,000 $ 72,000  
Number of securities that have unrealized losses | security 272     272    
Number of held to maturity securities that have unrealized losses | security 161     161    
Securities deemed to be other than temporary       $ 0    
Asset Pledged as Collateral            
Debt Securities, Available-for-sale [Line Items]            
Investment securities pledged as collateral $ 350,100,000     $ 350,100,000   $ 247,400,000