v3.26.1
Investment Securities - Schedule of Fair Value of Available for Sale Securities by Contractual Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Securities available for sale:    
Fair Value $ 7,016,650 $ 6,372,463
Securities held to maturity:    
Amortized cost 1,526 1,689
Fair Value 1,542 1,700
U.S. government obligations and government- sponsored enterprises    
Securities available for sale:    
1 year or less, amortized cost $ 129,699  
1 year or less, yield (as percent) 4.45%  
Due in one year or less, fair value $ 129,902  
After 1 but within 5 years, amortized cost $ 1,131,899  
After 1 but within 5 years, yield (as percent) 4.18%  
Due after one year to five years, fair value $ 1,127,593  
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 $ 5,849,445  
Indeterminate maturity, yield (as percent) 4.12%  
Indeterminate maturity, fair value $ 5,740,433  
Amortized cost $ 7,111,043  
FTE Yield 4.13%  
Fair Value $ 6,997,928  
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 $ 19  
Indeterminate maturity, yield (as a percent) 6.11%  
Indeterminate maturity, fair value $ 20  
Amortized cost $ 19  
FTE Yield 6.11%  
Fair Value $ 20  
Obligations of states and political subdivisions    
Securities available for sale:    
1 year or less, amortized cost $ 7,846  
1 year or less, yield (as percent) 4.40%  
Due in one year or less, fair value $ 7,846  
After 1 but within 5 years, amortized cost $ 6,088  
After 1 but within 5 years, yield (as percent) 4.53%  
Due after one year to five years, fair value $ 6,073  
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 $ 397  
After 10 years, yield (as percent) 7.91%  
Due after ten years, fair value $ 393  
Indeterminate maturity, amortized cost $ 0  
Indeterminate maturity, yield (as percent) 0.00%  
Indeterminate maturity, fair value $ 0  
Amortized cost $ 14,331  
FTE Yield 4.55%  
Fair Value $ 14,312 16,644
Securities held to maturity:    
1 year or less, amortized cost $ 295  
1 year or less, yield (as percent) 5.04%  
Due in one year or less, fair value $ 295  
After 1 but within 5 years, amortized cost $ 1,224  
After 1 but within 5 years, yield (as percent) 2.28%  
Due after one year to five years, fair value $ 1,227  
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 $ 1,519 1,678
FTE Yield 2.82%  
Fair Value $ 1,522 1,678
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 $ 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 $ 4,467  
Indeterminate maturity, yield (as percent) 4.58%  
Indeterminate maturity, fair value $ 4,410  
Amortized cost $ 4,467  
FTE Yield 4.58%  
Fair Value $ 4,410 $ 6,499
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