Fair Value of Assets and Liabilities - Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Instruments – Assets
Held-to-Maturity: Fair Value	$ 4,646,619	$ 3,348,693	$ 3,062,882
Carrying Amount
Financial Instruments – Assets
Held-to-Maturity: Fair Value	4,694,780	3,262,727
Loans	11,921,869	11,536,011
Financial Instruments – Liabilities
Time Deposits	1,000,089	1,662,063
Securities Sold Under Agreements to Repurchase	450,490	600,590
Other Debt		50,000
Fair Value
Financial Instruments – Assets
Held-to-Maturity: Fair Value	4,646,619	3,348,693
Loans	12,094,631	12,019,151
Financial Instruments – Liabilities
Time Deposits	998,134	1,667,774
Securities Sold Under Agreements to Repurchase	469,293	649,039
Other Debt		51,546
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments – Assets
Held-to-Maturity: Fair Value	131,139	7,500
Loans	0	0
Financial Instruments – Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt		0
Significant Other Observable Inputs (Level 2) | Fair Value
Financial Instruments – Assets
Held-to-Maturity: Fair Value	4,515,480	3,341,193
Loans	0	0
Financial Instruments – Liabilities
Time Deposits	998,134	1,667,774
Securities Sold Under Agreements to Repurchase	469,293	649,039
Other Debt		51,546
Significant Other Unobservable Inputs (Level 3) | Fair Value
Financial Instruments – Assets
Held-to-Maturity: Fair Value	0	0
Loans	12,094,631	12,019,151
Financial Instruments – Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	$ 0	0
Other Debt		$ 0