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Investment Securities - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]        
Federal reserve and federal home loan bank stock   $ 25,748,000 $ 65,067,000  
Transfer to real estate owned   0 475,000 $ 149,000
Payments to acquire held-to-maturity securities   0 290,740,000 0
Realized gain (loss) recognized at time of transfer   0    
(Reversal of) provision for credit losses - AFS debt securities   0 (603,000) 454,000
Provision for credit losses - HTM debt securities   1,190,000 766,000 0
Available-for-sale, allowance for credit loss   17,000 17,000  
Held to Maturity, Allowance for credit loss   (1,956,000) (766,000)  
Proceeds from sales and calls of investment securities   11,200,000 14,600,000 201,000,000
Debt securities, available-for-sale, realized gain   129,000 18,000 3,200,000
Debt securities, available-for-sale, realized loss   $ 140,000 $ 187,000 $ 187,000
Holdings of securities of any one issuer   10.00% 10.00%  
Collateral Pledged        
Debt Securities, Available-for-sale [Line Items]        
Available-for-sale securities pledged as collateral   $ 2,100,000,000 $ 220,100,000  
Other Assets        
Debt Securities, Available-for-sale [Line Items]        
Accrued interest on available for sale securities   7,600,000 7,800,000  
Residential mortgage-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Transfer to real estate owned $ 1,100,000,000      
Payments to acquire held-to-maturity securities 237,000,000      
Unrealized gain (loss) $ 66,200,000 51,700,000    
Available-for-sale, allowance for credit loss   $ 0 $ 0