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, 2024	Dec. 31, 2023
Financial Instruments - Assets
Held-to-Maturity: Fair Value	$ 4,002,122	$ 4,253,637
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,812,954	4,997,335
Loans	13,562,114	13,698,701
Financial Instruments - Liabilities
Time Deposits	2,900,712	3,057,302
Securities Sold Under Agreements to Repurchase	100,490	150,490
Other Debt	550,000	550,000
Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,002,122	4,253,637
Loans	12,587,876	12,872,260
Financial Instruments - Liabilities
Time Deposits	2,881,865	3,043,258
Securities Sold Under Agreements to Repurchase	101,753	155,461
Other Debt	544,524	541,466
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	115,203	116,531
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	3,886,919	4,137,106
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	2,881,865	3,043,258
Securities Sold Under Agreements to Repurchase	101,753	155,461
Other Debt	544,524	541,466
Significant Other Unobservable Inputs (Level 3) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	0	0
Loans	12,587,876	12,872,260
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	$ 0	$ 0