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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]            
Federal Reserve and Federal Home Loan Bank stock $ 42,311     $ 42,311   $ 34,153
Transfer to real estate owned       475 $ 148  
Payments to acquire held-to-maturity securities       290,740 0  
Realized gain recognized at time of transfer       0    
Accrued interest on HTM securities 3,800     3,800    
AFS Allowance for credit losses 18     18   620
HTM Allowance for credit losses $ (802)     $ (802)   $ 0
Debt securities as percentage of total investment securities (100.00%)     (100.00%)    
Debt securities weighted average duration       4 years 10 months 2 days    
Debt securities, available-for-sale, realized gain $ 4   $ 1,500 $ 16 2,200  
Debt securities, available-for-sale, realized loss 0   0 187 187  
Gross proceeds from sales and calls $ 12,600   $ 85,500 $ 32,700 $ 164,600  
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 gain (loss)   $ 66,200   $ 61,100    
AFS Allowance for credit losses $ 0     0   $ 0
HTM Allowance for credit losses 0     0    
Other Assets            
Debt Securities, Available-for-sale [Line Items]            
Accrued interest on available for sale securities 4,500     4,500   6,000
Collateral Pledged            
Debt Securities, Available-for-sale [Line Items]            
Debt securities, available-for-sale, restricted $ 146,100     $ 146,100   $ 261,000