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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Certain Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | $ 203,467 |  | $ 202,427 |
Interest-earning deposits in financial institutions |  | 2,495,343 |  | 5,175,149 |
Securities available-for-sale, Carrying Amount |  | 2,244,031 |  | 2,346,864 |
Investment in FHLB stock, Carrying Amount |  | 132,380 |  | 126,346 |
Investment in FHLB stock, Fair Value |  | 132,380 |  | 126,346 |
Loans Held-for-sale, Fair Value Disclosure |  | 1,936,118 |  | 126,646 |
Loans held for sale |  | 1,935,455 |  | 122,757 |
Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,145,929 and $2,168,316, respectively) |  | 2,296,708 | [1] | 2,287,291 | [2]
Loans and leases, net | [3] | 22,981,147 |  | 25,208,000 |
Loans and leases held for investment, net |  | 21,809,106 |  | 23,551,725 |
Servicing Asset |  | 20,783 |  | 22,174 |
Equity Securities, FV-NI |  | 1 |  | 1 |
Servicing rights |  | 21,988 |  | 22,174 |
Demand, interest checking, money market, and savings deposits |  | 22,012,326 |  | 23,768,896 |
Time deposits |  | 6,792,124 |  | 6,632,873 |
Time deposits |  | 6,847,891 |  | 6,732,246 |
Borrowings (including $124,434 and $123,116 at fair value, respectively) |  | 1,440,875 |  | 2,911,322 |
Borrowings |  | 1,441,407 |  | 2,908,527 |
Subordinated debt |  | 939,287 |  | 936,599 |
Subordinated Debt Obligations, Fair Value Disclosure |  | 873,446 |  | 851,625 |
Derivative Liability |  | 7,609 |  | 10,549 |
Securities held to maturity, fair value |  | 2,145,929 | [1] | 2,168,316 | [2]
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) |  | 2,244,031 |  | 2,346,864 |
U.S. Treasury securities |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,145,929 and $2,168,316, respectively) |  | 188,495 |  | 187,033 |
Securities held to maturity, fair value |  | 171,929 |  | 175,579 |
Level 1 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 203,467 |  | 202,427 |
Interest-earning deposits in financial institutions |  | 2,495,343 |  | 5,175,149 |
Investment in FHLB stock, Fair Value |  | 0 |  | 0 |
Loans Held-for-sale, Fair Value Disclosure |  | 0 |  | 0 |
Demand, interest checking, money market, and savings deposits |  | 0 |  | 0 |
Time deposits |  | 0 |  | 0 |
Borrowings |  | 0 |  | 0 |
Subordinated Debt Obligations, Fair Value Disclosure |  | 0 |  | 0 |
Level 2 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 0 |  | 0 |
Interest-earning deposits in financial institutions |  | 0 |  | 0 |
Investment in FHLB stock, Fair Value |  | 132,380 |  | 126,346 |
Loans Held-for-sale, Fair Value Disclosure |  | 1,936,118 |  | 126,646 |
Demand, interest checking, money market, and savings deposits |  | 22,012,326 |  | 23,768,896 |
Time deposits |  | 6,847,891 |  | 6,732,246 |
Borrowings |  | 1,316,973 |  | 2,785,411 |
Subordinated Debt Obligations, Fair Value Disclosure |  | 873,446 |  | 851,625 |
Level 3 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 0 |  | 0 |
Interest-earning deposits in financial institutions |  | 0 |  | 0 |
Investment in FHLB stock, Fair Value |  | 0 |  | 0 |
Loans Held-for-sale, Fair Value Disclosure |  | 0 |  | 0 |
Loans and leases held for investment, net |  | 21,785,733 |  | 23,547,674 |
Equity warrants |  |  |  | 3,689 |
Demand, interest checking, money market, and savings deposits |  | 0 |  | 0 |
Time deposits |  | 0 |  | 0 |
Borrowings |  | 124,434 |  | 123,116 |
Subordinated Debt Obligations, Fair Value Disclosure |  | 0 |  | 0 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity warrants |  | 3,557 |  | 3,689 |
Other derivative assets, Fair Value |  | 10,727 |  | 8,309 |
Derivative liabilities |  | 7,609 |  | 10,549 |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) |  | 2,244,031 |  |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity warrants |  | 0 |  | 0 |
Other derivative assets, Fair Value |  | 0 |  | 0 |
Equity Securities, FV-NI |  | 1 |  | 1 |
Servicing rights |  | 0 |  | 0 |
Derivative liabilities |  | 0 |  | 0 |
Securities held to maturity, fair value |  | 171,929 |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) |  | 0 |  | 4,968 |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity warrants |  | 0 |  | 0 |
Other derivative assets, Fair Value |  | 10,727 |  | 8,309 |
Equity Securities, FV-NI |  | 0 |  | 0 |
Servicing rights |  | 0 |  | 0 |
Derivative liabilities |  | 7,609 |  | 10,549 |
Securities held to maturity, fair value |  | 1,970,633 |  | 1,976,015 |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) |  | 2,229,912 |  | 2,301,647 |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity warrants |  | 3,557 |  | 3,689 |
Other derivative assets, Fair Value |  | 0 |  | 0 |
Equity Securities, FV-NI |  | 0 |  | 0 |
Servicing rights |  | 21,988 |  | 22,174 |
Derivative liabilities |  | 0 |  | 0 |
Securities held to maturity, fair value |  | 3,367 |  | 16,722 |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,613,901 and $2,699,255, respectively) |  | 14,119 |  | 40,249 |
NonPCI and PCI Loans | Level 1 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans and leases held for investment, net |  | 0 |  | 0 |
NonPCI and PCI Loans | Level 2 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loans and leases held for investment, net |  | $ 23,373 |  | $ 4,051 |
[1] | Excludes accrued interest receivable of $13.4 million at June 30, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] | Excludes accrued interest receivable of $13.4 million at December 31, 2023 which is recorded in "Other assets" on the condensed consolidated balance sheets
[3] | Excludes accrued interest receivable of $109.2 million and $111.3 million at June 30, 2024 and December 31, 2023, respectively, which is recorded in "Other assets" on the condensed consolidated balance sheets.

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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