Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Banking Regulation, Total Capital, Actual	$ 4,593,079	$ 4,282,597
Banking Regulation, Total Risk-Based Capital Ratio, Actual	13.08%	12.61%
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum	$ 2,810,054	$ 2,716,014
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum	8.00%	8.00%
Banking Regulation, Tier 1 Risk-Based Capital, Actual	$ 3,877,823	$ 3,590,948
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual	11.04%	10.58%
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 2,107,541	$ 2,037,010
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	6.00%	6.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual	$ 3,683,711	$ 3,396,836
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual	10.49%	10.01%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 1,580,656	$ 1,527,758
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	4.50%	4.50%
Banking Regulation, Tier 1 Leverage Capital, Actual	$ 3,877,823	$ 3,590,948
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual	8.96%	8.73%
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum	$ 1,730,902	$ 1,644,627
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum	4.00%	4.00%
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Banking Regulation, Total Capital, Actual	$ 4,357,088	$ 4,078,042
Banking Regulation, Total Risk-Based Capital Ratio, Actual	12.43%	12.03%
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum	$ 2,804,726	$ 2,710,815
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum	8.00%	8.00%
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum	$ 3,505,907	$ 3,388,519
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum	10.00%	10.00%
Banking Regulation, Tier 1 Risk-Based Capital, Actual	$ 3,687,739	$ 3,425,721
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual	10.52%	10.11%
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 2,103,544	$ 2,033,111
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	6.00%	6.00%
Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum	$ 2,804,726	$ 2,710,815
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum	8.00%	8.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual	$ 3,687,739	$ 3,425,721
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual	10.52%	10.11%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 1,577,658	$ 1,524,833
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	4.50%	4.50%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum	$ 2,278,840	$ 2,202,537
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum	6.50%	6.50%
Banking Regulation, Tier 1 Leverage Capital, Actual	$ 3,687,739	$ 3,425,721
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual	8.53%	8.34%
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum	$ 1,728,445	$ 1,642,484
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum	4.00%	4.00%
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum	$ 2,160,556	$ 2,053,105
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum	5.00%	5.00%