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Investment Securities - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]        
Federal Reserve and Federal Home Loan Bank stock   $ 51,763,000 $ 25,748,000  
Transfer to real estate owned   2,370,000 0 $ 475,000
Payments to acquire held-to-maturity securities   0 0 290,740,000
Realized gain (loss) recognized at time of transfer   0    
Allowance for credit losses   22,000 17,000  
HTM Allowance for credit losses   (1,306,000) (1,956,000)  
Proceeds from sales and calls of investment securities   153,000,000.0 11,200,000 14,600,000
Debt securities, available-for-sale, realized gain   14,000 129,000 18,000
Debt securities, available-for-sale, realized loss   $ 0 $ 140,000 $ 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   $ 400,000,000 $ 2,100,000,000  
Other Assets        
Debt Securities, Available-for-sale [Line Items]        
Accrued interest on available for sale securities   6,600,000 7,600,000  
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 44,800,000    
Allowance for credit losses   $ 0 $ 0