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Investment Securities - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
security
position
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
security
position
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
security
position
Schedule of Held-to-maturity Securities [Line Items]          
Available for sale debt securities, at fair value $ 2,626,783,000   $ 2,626,783,000   $ 1,690,112,000
Held to maturity debt securities $ 350,528,000   $ 350,528,000   $ 363,080,000
Total number of all held to maturity and available for sale securities in an unrealized loss position | security 1,168   1,168   808
Accrued interest on available for sale debt securities $ 9,200,000   $ 9,200,000   $ 4,900,000
Investments which pay principal on periodic basis, amortized cost 2,200,000,000   2,200,000,000    
Investments which pay principal on periodic basis, fair value 2,020,000,000.00   2,020,000,000.00    
Proceeds from sales of available for sale debt securities 568,400,000 $ 0 568,360,000 $ 0  
Gain recognized on sale of securities 0   0    
Loss recognized on sale of securities 3,000,000   3,000,000    
Proceeds from calls on securities $ 0 0 $ 0 0  
Securities available for sale, number of securities in an unrealized loss position | position 620   620   436
Accrued interest on held to maturity debt securities $ 3,000,000   $ 3,000,000   $ 3,100,000
Proceeds from sale of held-to-maturity securities 0 0 0 0  
Held to maturity securities, proceeds from calls 1,200,000 3,500,000 2,400,000 6,600,000  
Held to maturity securities, recognized gain on calls 0 28,000 0 24,000  
Held to maturity securities, recognized loss on calls $ 0 $ 0 $ 1,200 $ 0  
Number of securities in an unrealized loss position | security 548   548   372
AAA          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     18.00%    
AA          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     72.00%    
A          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     10.00%    
A rated or not rated          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     1.00%