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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Amortized Cost    
Due in one year or less $ 13,985  
Due from one year to five years 105,663  
Due from five years to ten years 298,517  
Due after ten years 834,878  
Amortized cost, before securities without debt maturities 1,253,043  
Amortized Cost 3,871,029  
Estimated Fair Value    
Due in one year or less 13,908  
Due from one year to five years 104,052  
Due from five years to ten years 283,407  
Due after ten years 675,063  
Available for sale securities, debt maturities, before securities without single maturities 1,076,430  
Estimated Fair Value 3,575,043 $ 3,410,899
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 1,496,280 1,395,569
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 1,309,834 1,183,449
Mortgage-Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 1,000,882  
Amortized Cost 1,000,882 1,029,846
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 973,352  
Estimated Fair Value 973,352 989,875
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 640,273  
Amortized Cost, Held to Maturity 640,273 537,856
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 589,369  
Estimated Fair Value, Held to Maturity 589,369 477,696
Commercial Mortgage Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 611,804  
Amortized Cost 611,804 617,605
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 518,413  
Estimated Fair Value 518,413 516,882
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 856,007  
Amortized Cost, Held to Maturity 856,007 857,713
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 720,465  
Estimated Fair Value, Held to Maturity 720,465 705,753
Collateralized Mortgage Obligations [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 1,005,300  
Amortized Cost 1,005,300 798,157
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 1,006,848  
Estimated Fair Value 1,006,848 $ 788,885
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