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, 2022	Dec. 31, 2021
Financial Instruments - Assets
Held-to-Maturity: Fair Value	$ 3,823,739	$ 4,646,619
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,321,693	4,694,780
Loans	12,647,239	11,921,869
Financial Instruments - Liabilities
Time Deposits	1,257,207	1,000,089
Securities Sold Under Agreements to Repurchase	425,490	450,490
Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	3,823,739	4,646,619
Loans	12,043,942	12,094,631
Financial Instruments - Liabilities
Time Deposits	1,240,477	998,134
Securities Sold Under Agreements to Repurchase	420,109	469,293
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	118,498	131,139
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	3,705,241	4,515,480
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	1,240,477	998,134
Securities Sold Under Agreements to Repurchase	420,109	469,293
Significant Other Unobservable Inputs (Level 3) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	0	0
Loans	12,043,942	12,094,631
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	$ 0	$ 0