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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]            
Federal Reserve and Federal Home Loan Bank stock $ 46,199     $ 46,199   $ 65,067
Payments to acquire held-to-maturity securities       0 $ 283,890  
Realized gain recognized at time of transfer       0    
Accrued interest on HTM securities 3,500     3,500   3,500
Allowance for credit losses for held-to-maturity securities in the period       (1,200)    
Allowance for credit losses 17     17   17
HTM Allowance for credit losses $ 2,010     $ 2,010   $ 766
Debt securities as percentage of total investment securities 100.00%     100.00%    
Debt securities weighted average duration       4 years 8 months 23 days    
Debt securities, available-for-sale, realized gain $ 2 $ 11   $ 7 11  
Debt securities, available-for-sale, realized loss 0 162   26 187  
Gross proceeds from sales and calls $ 273 $ 6,200   $ 8,600 $ 6,200  
Holdings of securities of any one issuer 10.00%     10.00%   10.00%
Residential mortgage-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Transfer to real estate owned     $ 1,100,000      
Payments to acquire held-to-maturity securities     237,000      
Unrealized loss     $ 66,200 $ 55,300    
Allowance for credit losses $ 0     0   $ 0
Municipal bonds            
Debt Securities, Available-for-sale [Line Items]            
Allowance for credit losses 0     0   0
Corporate bonds            
Debt Securities, Available-for-sale [Line Items]            
Allowance for credit losses 17     17   17
Other Assets            
Debt Securities, Available-for-sale [Line Items]            
Accrued interest on available for sale securities 4,200     4,200   4,300
Collateral Pledged            
Debt Securities, Available-for-sale [Line Items]            
Debt securities, available-for-sale, restricted $ 2,300,000     $ 2,300,000   $ 220,100