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Investment Securities - Narrative (Details)
3 Months Ended 8 Months Ended
Mar. 31, 2023
USD ($)
security
Mar. 31, 2022
USD ($)
Sep. 01, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, accrued interest receivable $ 2,200,000     $ 2,600,000  
Held-to-maturity securities, accrued interest receivable 2,000,000     1,900,000  
Held-to-maturity, book value     $ 511,000,000    
Fair Value 419,071,000   477,000,000 411,264,000  
Available-for-sale to held-to-maturity, transfer unrealized loss     $ 34,000,000    
Proceeds from sales of investment securities, available-for-sale $ 0 $ 3,061,000      
Gross realized gain on sale   24,000      
Number of available for sale securities that have unrealized losses | security 281        
Number of held to maturity securities that have unrealized losses | security 149        
Allowance for credit loss $ 16,599,000 $ 12,919,000   16,128,000 $ 12,910,000
Investment Securities          
Debt Securities, Available-for-sale [Line Items]          
Allowance for credit loss 0        
Asset Pledged as Collateral          
Debt Securities, Available-for-sale [Line Items]          
Investment securities pledged as collateral $ 389,300,000     $ 541,800,000