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Debt Securities Available-for-Sale - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
security
instrument
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Carrying value of securities available-for-sale $ 522,100 $ 542,100  
Gross proceeds on sales of securities 328,966 23,628 $ 79,255
Debt securities, available-for-sale, realized gain 1,500 350 514
Debt securities, available-for-sale, realized loss 0 23 0
Debt securities, trading, realized gain (loss) 1,700 $ 1,600 $ 2,000
Accrued interest receivable associated with debt securities available-for-sale $ 2,500    
Continuous Unrealized Loss Position Less Than 12 Months | REMIC | Non-pass through certificates      
Schedule of Available-for-sale Securities [Line Items]      
Number of debt securities, unrealized loss position less than 12 months | security 28    
GSE | REMIC      
Schedule of Available-for-sale Securities [Line Items]      
Number of debt securities, unrealized loss position less than 12 months | instrument 1    
GSE | Continuous Unrealized Loss Position 12 Months Or Longer | REMIC      
Schedule of Available-for-sale Securities [Line Items]      
Number of debt securities, unrealized loss position longer than 12 months | security 20    
GSE | Continuous Unrealized Loss Position 12 Months Or Longer | REMIC | Pass-through certificates      
Schedule of Available-for-sale Securities [Line Items]      
Number of debt securities, unrealized loss position longer than 12 months | security 15    
GSE | Continuous Unrealized Loss Position Less Than 12 Months | REMIC | Pass-through certificates      
Schedule of Available-for-sale Securities [Line Items]      
Number of debt securities, unrealized loss position less than 12 months | security 27    
Municipal Bonds | REMIC      
Schedule of Available-for-sale Securities [Line Items]      
Number of debt securities, unrealized loss position less than 12 months | instrument 21