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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 231,703  
Due from one year to five years 111,296  
Due from five years to ten years 550,997  
Due after ten years 1,015,962  
Amortized cost, before securities without debt maturities 1,909,958  
Amortized Cost 2,898,568  
Estimated Fair Value    
Due in one year or less 228,876  
Due from one year to five years 106,291  
Due from five years to ten years 487,118  
Due after ten years 778,778  
Available for sale securities, debt maturities, before securities without single maturities 1,601,063  
Estimated Fair Value 2,418,868 $ 2,646,767
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 1,279,733 1,321,256
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 1,019,844 1,125,049
Mortgage-Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 228,431  
Amortized Cost 228,431 242,527
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 189,275  
Estimated Fair Value 189,275 212,698
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 418,362  
Amortized Cost, Held to Maturity 418,362 457,325
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 344,810  
Estimated Fair Value, Held to Maturity 344,810 399,845
Commercial Mortgage Backed Securities [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 632,334  
Amortized Cost 632,334 631,604
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 516,313  
Estimated Fair Value 516,313 552,522
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 861,371  
Amortized Cost, Held to Maturity 861,371 863,931
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 675,034  
Estimated Fair Value, Held to Maturity 675,034 725,204
Collateralized Mortgage Obligations [Member]    
Amortized Cost    
Available-for-sale securities, amortized cost without single maturity date 127,845  
Amortized Cost 127,845 147,155
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 112,217  
Estimated Fair Value 112,217 $ 134,033
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