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Fair Values of Assets and Liabilities - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Financial Assets: |  |  |
Interest-bearing deposits with banks | $ 2,448,570 | $ 1,988,719 | $ 3,968,605
Available-for-sale securities | 3,611,835 | 3,243,017 | 2,923,653
Held-to-maturity securities | 3,057,959 | 2,949,821 | 2,679,326
Equity securities with readily determinable fair value | 134,310 | 110,365 | 114,012
FHLB and FRB stock, at cost | 204,040 | 224,759 | 178,156
Brokerage customer receivables | 14,042 | 16,387 | 20,327
Mortgage loans held-for-sale, at fair value | 304,808 | 299,935 | 376,160
Accrued interest receivable and other | 1,674,681 | 1,391,342 | 1,316,305
Financial Liabilities |  |  |
FHLB advances | 2,326,071 | 2,316,071 | 2,316,071
Other borrowings | 643,999 | 596,614 | 447,215
Subordinated notes | 437,731 | 437,392 | 437,260
Junior subordinated debentures | 253,566 | 253,566 | 253,566
Carrying Value |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 418,148 | 490,966 | 489,647
Interest-bearing deposits with banks | 2,448,570 | 1,988,719 | 3,968,605
Available-for-sale securities | 3,611,835 | 3,243,017 | 2,923,653
Held-to-maturity securities | 3,909,150 | 3,640,567 | 3,389,842
Trading account securities | 1,663 | 1,127 | 179
Equity securities with readily determinable fair value | 134,310 | 110,365 | 114,012
FHLB and FRB stock, at cost | 204,040 | 224,759 | 178,156
Brokerage customer receivables | 14,042 | 16,387 | 20,327
Mortgage loans held-for-sale, at fair value | 304,808 | 299,935 | 376,160
Nonqualified deferred compensation assets | 14,449 | 13,899 | 13,387
Derivative assets | 323,705 | 296,848 | 313,480
Accrued interest receivable and other | 465,117 | 379,719 | 317,142
Total | 53,295,869 | 49,902,793 | 50,272,203
Financial Liabilities |  |  |
Non-maturity deposits | 38,204,017 | 38,167,409 | 38,720,873
Deposits with stated maturities | 6,788,669 | 4,735,135 | 4,076,318
FHLB advances | 2,326,071 | 2,316,071 | 2,316,071
Other borrowings | 643,999 | 596,614 | 447,215
Subordinated notes | 437,731 | 437,392 | 437,260
Junior subordinated debentures | 253,566 | 253,566 | 253,566
Derivative liabilities | 458,706 | 338,078 | 357,170
Accrued interest payable | 54,383 | 22,176 | 18,479
Total financial liabilities | 49,167,142 | 46,866,441 | 46,626,952
Carrying Value | Loans held-for-investment, at fair value |  |  |
Financial Assets: |  |  |
Loans held-for-investment | 171,178 | 179,932 | 156,893
Carrying Value | Loans held-for-investment, at amortized cost |  |  |
Financial Assets: |  |  |
Loans held-for-investment | 41,274,854 | 39,016,553 | 38,010,720
Fair Value |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 418,148 | 490,966 | 489,647
Interest-bearing deposits with banks | 2,448,570 | 1,988,719 | 3,968,605
Available-for-sale securities | 3,611,835 | 3,243,017 | 2,923,653
Held-to-maturity securities | 3,057,959 | 2,949,821 | 2,679,326
Trading account securities | 1,663 | 1,127 | 179
Equity securities with readily determinable fair value | 134,310 | 110,365 | 114,012
FHLB and FRB stock, at cost | 204,040 | 224,759 | 178,156
Brokerage customer receivables | 14,042 | 16,387 | 20,327
Mortgage loans held-for-sale, at fair value | 304,808 | 299,935 | 376,160
Nonqualified deferred compensation assets | 14,449 | 13,899 | 13,387
Derivative assets | 323,705 | 296,848 | 313,480
Accrued interest receivable and other | 465,117 | 379,719 | 317,142
Total | 51,470,032 | 48,214,172 | 48,775,720
Financial Liabilities |  |  |
Non-maturity deposits | 38,204,017 | 38,167,409 | 38,720,873
Deposits with stated maturities | 6,744,989 | 4,085,058 | 4,087,196
FHLB advances | 2,189,101 | 2,219,983 | 2,230,921
Other borrowings | 641,514 | 569,342 | 447,971
Subordinated notes | 400,520 | 409,395 | 417,363
Junior subordinated debentures | 253,568 | 253,405 | 285,238
Derivative liabilities | 458,706 | 338,078 | 357,170
Accrued interest payable | 54,383 | 22,176 | 18,479
Total financial liabilities | 48,946,798 | 46,064,846 | 46,565,211
Fair Value | Loans held-for-investment, at fair value |  |  |
Financial Assets: |  |  |
Loans held-for-investment | 171,178 | 179,932 | 156,893
Fair Value | Loans held-for-investment, at amortized cost |  |  |
Financial Assets: |  |  |
Loans held-for-investment | $ 40,300,208 | $ 38,018,678 | $ 37,224,753

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