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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Available for Sale    
Due in one year or less $ 49,267  
Due from one year to five years 153,550  
Due from five years to ten years 508,237  
Due after ten years 1,013,744  
Amortized cost, before securities without debt maturities 1,724,798  
Amortized Cost 2,698,259 $ 2,992,513
Estimated Fair Value    
Due in one year or less 49,022  
Due from one year to five years 147,521  
Due from five years to ten years 471,086  
Due after ten years 888,106  
Available for sale securities, debt maturities, before securities without single maturities 1,555,735  
Estimated Fair Value 2,398,352 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 1,267,922 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 1,072,207  
Residential mortgage-backed securities    
Available for Sale    
Available-for-sale securities, amortized cost without single maturity date 223,273  
Amortized Cost 223,273 242,527
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 196,795  
Estimated Fair Value 196,795 212,698
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 407,075  
Amortized Cost 407,075 457,325
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 355,270  
Estimated Fair Value 355,270 399,845
Commercial mortgage-backed securities    
Available for Sale    
Available-for-sale securities, amortized cost without single maturity date 627,364  
Amortized Cost 627,364 631,604
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 534,388  
Estimated Fair Value 534,388 552,522
Amortized Cost    
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost 860,847  
Amortized Cost 860,847 863,931
Estimated Fair Value    
Debt securities, held-to-maturity, maturity, without single maturity date, fair value 716,937  
Estimated Fair Value 716,937 725,204
Collateralized mortgage obligations    
Available for Sale    
Available-for-sale securities, amortized cost without single maturity date 122,824  
Amortized Cost 122,824 147,155
Estimated Fair Value    
Available-for-sale securities, debt maturities, without single maturity date, fair value 111,434  
Estimated Fair Value 111,434 $ 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