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Fair Value of Assets and Liabilities (Summary of Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Financial Assets: |  |
Securities sold under agreements to repurchase with original maturities exceeding three months | $ 0 | $ 700,000,000
Interest-bearing deposits with banks | 1,988,719,000 | 5,372,603,000
Available-for-sale securities | 3,243,017,000 | 2,327,793,000
Held-to-maturity securities | 2,949,821,000 | 2,900,694,000
Equity securities with readily determinable fair value | 110,365,000 | 90,511,000
FHLB and FRB stock, at cost | 224,759,000 | 135,378,000
Brokerage customer receivables | 16,387,000 | 26,068,000
Mortgage loans held-for-sale, at fair value | 299,935,000 | 817,912,000
Accrued interest receivable and other assets | 1,391,342,000 | 1,084,115,000
Financial Liabilities: |  |
Federal Home Loan Bank advances | 2,316,071,000 | 1,241,071,000
Other borrowings | 596,614,000 | 494,136,000
Subordinated notes | 437,392,000 | 436,938,000
Junior subordinated debentures | 253,566,000 | 253,566,000
Carrying Value |  |
Financial Assets: |  |
Cash and cash equivalents | 490,966,000 | 411,205,000
Securities sold under agreements to repurchase with original maturities exceeding three months | 0 | 700,000,000
Interest-bearing deposits with banks | 1,988,719,000 | 5,372,603,000
Available-for-sale securities | 3,243,017,000 | 2,327,793,000
Held-to-maturity securities | 3,640,567,000 | 2,942,285,000
Trading account securities | 1,127,000 | 1,061,000
Equity securities with readily determinable fair value | 110,365,000 | 90,511,000
FHLB and FRB stock, at cost | 224,759,000 | 135,378,000
Brokerage customer receivables | 16,387,000 | 26,068,000
Mortgage loans held-for-sale, at fair value | 299,935,000 | 817,912,000
Nonqualified deferred compensation assets | 13,899,000 | 16,240,000
Derivative assets | 296,848,000 | 165,008,000
Accrued interest receivable and other assets | 379,719,000 | 268,921,000
Total financial assets | 49,902,793,000 | 48,064,089,000
Financial Liabilities: |  |
Non-maturity deposits | 38,167,409,000 | 38,126,796,000
Deposits with stated maturities | 4,735,135,000 | 3,968,789,000
Federal Home Loan Bank advances | 2,316,071,000 | 1,241,071,000
Other borrowings | 596,614,000 | 494,136,000
Subordinated notes | 437,392,000 | 436,938,000
Junior subordinated debentures | 253,566,000 | 253,566,000
Derivative liabilities | 338,078,000 | 123,000,000
Accrued interest payable | 22,176,000 | 9,304,000
Total financial liabilities | 46,866,441,000 | 44,653,600,000
Carrying Value | Loans held-for-investment, at fair value |  |
Financial Assets: |  |
Loans held-for-investment | 179,932,000 | 38,598,000
Carrying Value | Loans held-for-investment, at amortized cost |  |
Financial Assets: |  |
Loans held-for-investment | 39,016,553,000 | 34,750,506,000
Fair Value |  |
Financial Assets: |  |
Cash and cash equivalents | 490,966,000 | 411,205,000
Securities sold under agreements to repurchase with original maturities exceeding three months | 0 | 700,000,000
Interest-bearing deposits with banks | 1,988,719,000 | 5,372,603,000
Available-for-sale securities | 3,243,017,000 | 2,327,793,000
Trading account securities | 1,127,000 | 1,061,000
Equity securities with readily determinable fair value | 110,365,000 | 90,511,000
FHLB and FRB stock, at cost | 224,759,000 | 135,378,000
Brokerage customer receivables | 16,387,000 | 26,068,000
Mortgage loans held-for-sale, at fair value | 299,935,000 | 817,912,000
Nonqualified deferred compensation assets | 13,899,000 | 16,240,000
Derivative assets | 296,848,000 | 165,008,000
Accrued interest receivable and other assets | 379,719,000 | 268,921,000
Total financial assets | 48,214,172,000 | 48,569,870,000
Financial Liabilities: |  |
Non-maturity deposits | 38,167,409,000 | 38,126,796,000
Deposits with stated maturities | 4,085,058,000 | 3,965,372,000
Federal Home Loan Bank advances | 2,219,983,000 | 1,186,280,000
Other borrowings | 569,342,000 | 494,670,000
Subordinated notes | 409,395,000 | 472,684,000
Junior subordinated debentures | 253,405,000 | 212,226,000
Derivative liabilities | 338,078,000 | 123,000,000
Accrued interest payable | 22,176,000 | 9,304,000
Total financial liabilities | 46,064,846,000 | 44,590,332,000
Fair Value | Loans held-for-investment, at fair value |  |
Financial Assets: |  |
Loans held-for-investment | 179,932,000 | 38,598,000
Fair Value | Loans held-for-investment, at amortized cost |  |
Financial Assets: |  |
Loans held-for-investment | $ 38,018,678,000 | $ 35,297,878,000

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