Fair Value of Assets and Liabilities - Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financial Instruments - Assets
Held-to-Maturity: Fair Value	$ 3,823,655	$ 3,820,882
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,535,108	4,618,543
Loans	13,815,211	13,777,756
Financial Instruments - Liabilities
Time Deposits	3,038,894	3,059,575
Securities Sold Under Agreements to Repurchase	50,000	100,000
Other Debt	550,000	550,000
Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	3,823,655	3,820,882
Loans	13,111,245	12,908,626
Financial Instruments - Liabilities
Time Deposits	3,029,831	3,050,583
Securities Sold Under Agreements to Repurchase	51,407	101,478
Other Debt	543,692	538,808
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	119,571	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
Held-to-Maturity: Fair Value	3,704,084	3,703,941
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	3,029,831	3,050,583
Securities Sold Under Agreements to Repurchase	51,407	101,478
Other Debt	543,692	538,808
Significant Other Unobservable Inputs (Level 3) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	0	0
Loans	13,111,245	12,908,626
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	$ 0	$ 0