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, 2023	Dec. 31, 2022
Financial Instruments - Assets
Held-to-Maturity: Fair Value	$ 4,601,876	$ 4,615,393
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity: Fair Value	5,312,815	5,414,139
Loans	13,556,149	13,371,226
Financial Instruments - Liabilities
Time Deposits	1,922,753	1,705,737
Securities Sold Under Agreements to Repurchase	725,490	725,490
Other Debt	500,000	400,000
Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,601,876	4,615,393
Loans	12,734,400	12,386,615
Financial Instruments - Liabilities
Time Deposits	1,900,997	1,679,777
Securities Sold Under Agreements to Repurchase	725,014	718,614
Other Debt	510,625	402,877
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	116,242	113,417
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Significant Other Observable Inputs (Level 2) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,485,634	4,501,976
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	1,900,997	1,679,777
Securities Sold Under Agreements to Repurchase	725,014	718,614
Other Debt	510,625	402,877
Significant Other Unobservable Inputs (Level 3) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	0	0
Loans	12,734,400	12,386,615
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	$ 0	$ 0