Fair Value of Assets and Liabilities - Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial Instruments - Assets
Held-to-Maturity: Fair Value	$ 4,104,469	$ 4,615,393
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity: Fair Value	5,088,013	5,414,139
Loans	13,651,759	13,371,226
Financial Instruments - Liabilities
Time Deposits	2,659,014	1,705,737
Securities Sold Under Agreements to Repurchase	150,490	725,490
Other Debt	550,000	400,000
Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,104,469	4,615,393
Loans	12,416,800	12,386,615
Financial Instruments - Liabilities
Time Deposits	2,627,361	1,679,777
Securities Sold Under Agreements to Repurchase	151,963	718,614
Other Debt	538,987	402,877
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	111,409	113,417
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	3,993,060	4,501,976
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	2,627,361	1,679,777
Securities Sold Under Agreements to Repurchase	151,963	718,614
Other Debt	538,987	402,877
Significant Other Unobservable Inputs (Level 3) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	0	0
Loans	12,416,800	12,386,615
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	$ 0	0
Other Debt		$ 0