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Loans and Leases - Loans and Leases Held for Investment (Details) - USD ($)
$ in Thousands

Mar. 31, 2024

Dec. 31, 2023

Mar. 31, 2023

Dec. 31, 2022

Financing Receivable, Credit Quality Indicator [Line Items]

Loans and leases held for investment

$ 25,755,961

$ 25,796,714

Deferred fees, net

(44,006)

(45,043)

Loans held for investment, net

25,473,022

25,489,687

Allowance for loan and lease losses

(291,503)

(281,687)

$ (210,055)

$ (200,732)

Loans and leases, net

^[1]

25,181,519

25,208,000

Land and Acquisitions and Development Loans

235,700

228,900

Deferred Discounts, Finance Charges and Interest Included in Receivables

^[2]

(238,933)

(261,984)

Financing Receivable, Unamortized Purchase Premium (Discount)

(308,900)

(334,200)

Financing Receivable, Unamortized Purchase Premium

70,000

72,200

Real Estate Mortgage

Financing Receivable, Credit Quality Indicator [Line Items]

Loans and leases held for investment

16,217,186

16,378,537

Allowance for loan and lease losses

(198,274)

(186,827)

(109,483)

(87,309)

Real Estate Construction and Land

Financing Receivable, Credit Quality Indicator [Line Items]

Loans and leases held for investment

^[3]

3,266,639

3,183,357

Allowance for loan and lease losses

(30,011)

(33,830)

(55,034)

(52,320)

Commercial

Financing Receivable, Credit Quality Indicator [Line Items]

Loans and leases held for investment

5,831,666

5,780,346

Allowance for loan and lease losses

(47,054)

(45,156)

(37,195)

(52,849)

Consumer

Financing Receivable, Credit Quality Indicator [Line Items]

Loans and leases held for investment

440,470

454,474

Allowance for loan and lease losses

(16,164)

(15,874)

$ (8,343)

$ (8,254)

Loans and Finance Receivables [Member]

Financing Receivable, Credit Quality Indicator [Line Items]

Interest Receivable

$ 109,300

$ 111,300

[1]	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.
[2]	Represents net acquisition discounts of $308.9 million and purchase premiums of $70.0 million at March 31, 2024, and net acquisition discounts of $334.2 million and purchase premiums of $72.2 million at December 31, 2023
[3]	Includes land and acquisition and development loans of $235.7 million and $228.9 million at March 31, 2024 and December 31, 2023

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Total Loans and Leases Held for Investment, Net of Unearned Discounts and Deferred Fees

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Unearned discounts (other than cash or quantity discounts and the like), finance charges, and interest included in the face amount of receivables, that are shown as a deduction from the related receivables. For example, 1) finance charges booked as a receivable when a loan is made and recognized as income at a later date; and 2) interest charges deducted from the face loan amount, resulting in a discounted amount actually advanced to the borrower (wherein the receivable includes the amount actually advanced to the borrower and the as yet unearned interest income).

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Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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