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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 13,762  
Due from one year to five years 110,303  
Due from five years to ten years 362,563  
Due after ten years 847,665  
Amortized cost, before securities without debt maturities 1,334,293  
Amortized Cost 3,259,122  
Estimated Fair Value    
Due in one year or less 13,533  
Due from one year to five years 106,430  
Due from five years to ten years 327,817  
Due after ten years 709,727  
Available for sale securities, debt maturities, before securities without single maturities 1,157,507  
Estimated Fair Value 2,939,594 $ 2,398,352
Amortized Cost    
Due in one year or less 0  
Due from one year to five years 0  
Due from five years to ten years 0  
Due after ten years 0  
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total 0  
Amortized Cost, Held to Maturity 1,244,433 1,267,922
Estimated Fair Value    
Due in one year or less 0  
Due from one year to five years 0  
Due from five years to ten years 0  
Due after ten years 0  
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value 0  
Estimated Fair Value, Held to Maturity 1,033,439 1,072,207
Mortgage-Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 589,267  
Amortized Cost 589,267 223,273
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 557,191  
Estimated Fair Value 557,191 196,795
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 384,956  
Amortized Cost, Held to Maturity 384,956 407,075
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 326,363  
Estimated Fair Value, Held to Maturity 326,363 355,270
Commercial Mortgage Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 610,960  
Amortized Cost 610,960 627,364
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 511,127  
Estimated Fair Value 511,127 534,388
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 859,477  
Amortized Cost, Held to Maturity 859,477 860,847
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 707,076  
Estimated Fair Value, Held to Maturity 707,076 716,937
Collateralized Mortgage Obligations [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 724,602  
Amortized Cost 724,602 122,824
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 713,769  
Estimated Fair Value 713,769 $ 111,434
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 0  
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value $ 0