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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Certain Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | $ 199,922 |  | $ 202,427 |
Interest-earning deposits in financial institutions |  | 2,885,306 |  | 5,175,149 |
Securities available-for-sale, Carrying Amount |  | 2,286,682 |  | 2,346,864 |
Investment in FHLB stock, Carrying Amount |  | 129,314 |  | 126,346 |
Investment in FHLB stock, Fair Value |  | 129,314 |  | 126,346 |
Loans Held-for-sale, Fair Value Disclosure |  | 82,383 |  | 126,646 |
Loans held for sale |  | 80,752 |  | 122,757 |
Securities held-to-maturity, at amortized cost, net of allowance for credit losses (fair value of $2,153,349 and $2,168,316, respectively) |  | 2,291,984 | [1] | 2,287,291 | [2]
Loans and leases, net | [3] | 25,181,519 |  | 25,208,000 |
Loans and leases held for investment, net |  | 23,553,410 |  | 23,551,725 |
Servicing Asset |  | 21,384 |  | 22,174 |
Equity Securities, FV-NI |  | 1 |  | 1 |
Servicing rights |  | 22,242 |  | 22,174 |
Demand, interest checking, money market, and savings deposits |  | 22,706,213 |  | 23,768,896 |
Time deposits |  | 6,186,194 |  | 6,632,873 |
Time deposits |  | 6,260,651 |  | 6,732,246 |
Borrowings (including $123,824 and $123,116 at fair value, respectively) |  | 2,139,498 |  | 2,911,322 |
Borrowings |  | 2,135,757 |  | 2,908,527 |
Subordinated debt |  | 937,717 |  | 936,599 |
Subordinated Debt Obligations, Fair Value Disclosure |  | 850,984 |  | 851,625 |
Derivative Liability |  | 7,337 |  | 10,549 |
Securities held to maturity, fair value |  | 2,153,349 | [1] | 2,168,316 | [2]
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) |  | 2,286,682 |  | 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 $2,153,349 and $2,168,316, respectively) |  | 187,759 |  | 187,033 |
Securities held to maturity, fair value |  | 172,338 |  | 175,579 |
Level 1 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 199,922 |  | 202,427 |
Interest-earning deposits in financial institutions |  | 2,885,306 |  | 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 |  | 129,314 |  | 126,346 |
Loans Held-for-sale, Fair Value Disclosure |  | 82,383 |  | 126,646 |
Demand, interest checking, money market, and savings deposits |  | 22,706,213 |  | 23,768,896 |
Time deposits |  | 6,260,651 |  | 6,732,246 |
Borrowings |  | 2,011,933 |  | 2,785,411 |
Subordinated Debt Obligations, Fair Value Disclosure |  | 850,984 |  | 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 |  | 23,550,808 |  | 23,547,674 |
Equity warrants |  |  |  | 3,689 |
Demand, interest checking, money market, and savings deposits |  | 0 |  | 0 |
Time deposits |  | 0 |  | 0 |
Borrowings |  | 123,824 |  | 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 |  | 3,708 |  | 3,689 |
Other derivative assets, Fair Value |  | 10,205 |  | 8,309 |
Derivative liabilities |  | 7,337 |  | 10,549 |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) |  | 2,286,682 |  |  |
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 |  | 172,338 |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 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 |  | 10,205 |  | 8,309 |
Equity Securities, FV-NI |  | 0 |  | 0 |
Servicing rights |  | 0 |  | 0 |
Derivative liabilities |  | 7,337 |  | 10,549 |
Securities held to maturity, fair value |  | 1,963,818 |  | 1,976,015 |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) |  | 2,284,582 |  | 2,301,647 |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity warrants |  | 3,708 |  | 3,689 |
Other derivative assets, Fair Value |  | 0 |  | 0 |
Equity Securities, FV-NI |  | 0 |  | 0 |
Servicing rights |  | 22,242 |  | 22,174 |
Derivative liabilities |  | 0 |  | 0 |
Securities held to maturity, fair value |  | 17,193 |  | 16,722 |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively) |  | 2,100 |  | 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 |  | $ 2,602 |  | $ 4,051 |
[1] | Excludes accrued interest receivable of $11.3 million at March 31, 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 $109.3 million and $111.3 million at March 31, 2024 and December 31, 2023, respectively, which is recorded in "Other assets" on the condensed consolidated balance sheets.

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