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Investment Securities - Schedule of Fair Value of Available for Sale Securities by Contractual Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Securities available for sale:    
Fair Value $ 6,372,463 $ 5,603,723
Securities held to maturity:    
Amortized cost 1,689 3,225
Fair Value 1,700 3,231
U.S. government obligations and government- sponsored enterprises    
Securities available for sale:    
1 year or less, amortized cost $ 96,253  
1 year or less, yield (as percent) 2.11%  
Due in one year or less, fair value $ 95,243  
After 1 but within 5 years, amortized cost $ 955,361  
After 1 but within 5 years, yield (as percent) 4.22%  
Due after one year to five years, fair value $ 965,500  
After 5 years but within 10 years, amortized cost $ 0  
After 5 years but within 10 years, yield (as percent) 0.00%  
Due after five to ten years, fair value $ 0  
After 10 years, amortized cost $ 0  
After 10 years, yield (as percent) 0.00%  
Due after ten years, fair value $ 0  
Indeterminate maturity, amortized cost $ 5,345,130  
Indeterminate maturity, yield (as percent) 4.04%  
Indeterminate maturity, fair value $ 5,288,577  
FTE Yield 4.04%  
Amortized cost $ 6,396,744  
Fair Value 6,349,320  
Securities held to maturity:    
1 year or less, amortized cost $ 0  
1 year or less, yield (as percent) 0.00%  
Due in one year or less, fair value $ 0  
After 1 but within 5 years, amortized cost $ 0  
After 1 but within 5 years, yield (as percent) 0.00%  
Due after one year to five years, fair value $ 0  
After 5 years but within 10 years, amortized cost $ 0  
After 5 years but within 10 years, yield (as percent) 0.00%  
Due after five to ten years, fair value $ 0  
After 10 years, amortized cost $ 0  
After 10 years, yield (as percent) 0.00%  
Due after ten years, fair value $ 0  
Indeterminate maturity, amortized cost $ 21  
Indeterminate maturity, yield (as a percent) 6.11%  
Indeterminate maturity, fair value $ 22  
Amortized cost $ 21  
FTE Yield 6.11%  
Fair Value $ 22  
Obligations of states and political subdivisions    
Securities available for sale:    
1 year or less, amortized cost $ 2,759  
1 year or less, yield (as percent) 3.55%  
Due in one year or less, fair value $ 2,757  
After 1 but within 5 years, amortized cost $ 13,173  
After 1 but within 5 years, yield (as percent) 4.54%  
Due after one year to five years, fair value $ 13,232  
After 5 years but within 10 years, amortized cost $ 256  
After 5 years but within 10 years, yield (as percent) 2.74%  
Due after five to ten years, fair value $ 252  
After 10 years, amortized cost $ 407  
After 10 years, yield (as percent) 7.89%  
Due after ten years, fair value $ 403  
Indeterminate maturity, amortized cost $ 0  
Indeterminate maturity, yield (as percent) 0.00%  
Indeterminate maturity, fair value $ 0  
FTE Yield 4.43%  
Amortized cost $ 16,595  
Fair Value 16,644 21,141
Securities held to maturity:    
1 year or less, amortized cost $ 155  
1 year or less, yield (as percent) 3.36%  
Due in one year or less, fair value $ 155  
After 1 but within 5 years, amortized cost $ 1,492  
After 1 but within 5 years, yield (as percent) 2.75%  
Due after one year to five years, fair value $ 1,492  
After 5 years but within 10 years, amortized cost $ 31  
After 5 years but within 10 years, yield (as percent) 6.52%  
Due after five to ten years, fair value $ 31  
After 10 years, amortized cost $ 0  
After 10 years, yield (as percent) 0.00%  
Due after ten years, fair value $ 0  
Indeterminate maturity, amortized cost $ 0  
Indeterminate maturity, yield (as a percent) 0.00%  
Indeterminate maturity, fair value $ 0  
Amortized cost $ 1,678 3,221
FTE Yield 2.88%  
Fair Value $ 1,678 3,205
Other securities    
Securities available for sale:    
1 year or less, amortized cost $ 0  
1 year or less, yield (as percent) 0.00%  
Due in one year or less, fair value $ 0  
After 1 but within 5 years, amortized cost $ 1,167  
After 1 but within 5 years, yield (as percent) 7.49%  
Due after one year to five years, fair value $ 1,167  
After 5 years but within 10 years, amortized cost $ 0  
After 5 years but within 10 years, yield (as percent) 0.00%  
Due after five to ten years, fair value $ 0  
After 10 years, amortized cost $ 0  
After 10 years, yield (as percent) 0.00%  
Due after ten years, fair value $ 0  
Indeterminate maturity, amortized cost $ 5,368  
Indeterminate maturity, yield (as percent) 5.07%  
Indeterminate maturity, fair value $ 5,332  
FTE Yield 5.58%  
Amortized cost $ 6,535  
Fair Value 6,499 $ 28,989
Securities held to maturity:    
1 year or less, amortized cost $ 0  
1 year or less, yield (as percent) 0.00%  
Due in one year or less, fair value $ 0  
After 1 but within 5 years, amortized cost $ 0  
After 1 but within 5 years, yield (as percent) 0.00%  
Due after one year to five years, fair value $ 0  
After 5 years but within 10 years, amortized cost $ 0  
After 5 years but within 10 years, yield (as percent) 0.00%  
Due after five to ten years, fair value $ 0  
After 10 years, amortized cost $ 0  
After 10 years, yield (as percent) 0.00%  
Due after ten years, fair value $ 0  
Indeterminate maturity, amortized cost $ 0  
Indeterminate maturity, yield (as a percent) 0.00%  
Indeterminate maturity, fair value $ 0  
Amortized cost $ 0  
FTE Yield 0.00%  
Fair Value $ 0