Fair Value of Assets and Liabilities - Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financial Instruments - Assets
Investment Securities Held-to-Maturity	$ 3,754,794	$ 3,820,882
Carrying Amount
Financial Instruments - Assets
Investment Securities Held-to-Maturity	4,441,353	4,618,543
Loans	13,700,594	13,777,756
Financial Instruments - Liabilities
Time Deposits	3,037,995	3,059,575
Securities Sold Under Agreements to Repurchase	50,000	100,000
Other Debt	550,000	550,000
Fair Value
Financial Instruments - Assets
Investment Securities Held-to-Maturity	3,754,794	3,820,882
Loans	13,073,565	12,908,626
Financial Instruments - Liabilities
Time Deposits	3,028,864	3,050,583
Securities Sold Under Agreements to Repurchase	51,619	101,478
Other Debt	545,556	538,808
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments - Assets
Investment Securities Held-to-Maturity	121,178	116,941
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	0	0
Significant Other Observable Inputs (Level 2) | Fair Value
Financial Instruments - Assets
Investment Securities Held-to-Maturity	3,633,616	3,703,941
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	3,028,864	3,050,583
Securities Sold Under Agreements to Repurchase	51,619	101,478
Other Debt	545,556	538,808
Significant Unobservable Inputs (Level 3) | Fair Value
Financial Instruments - Assets
Investment Securities Held-to-Maturity	0	0
Loans	13,073,565	12,908,626
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	$ 0	$ 0