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Fair Value of Financial Instruments - Schedule of Quantitative Information About Significant Unobservable Inputs (Level 3) for Assets Measured at Fair Value on a Recurring Basis (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Quantitative information for Level 3 Fair Value Measurements Assets
Investment securities available-for-sale, estimated fair value	$ 1,739,423	$ 895,034
Municipal obligations
Quantitative information for Level 3 Fair Value Measurements Assets
Investment securities available-for-sale, estimated fair value	235,434	20,254
Corporate debt obligations
Quantitative information for Level 3 Fair Value Measurements Assets
Investment securities available-for-sale, estimated fair value	48,255	$ 12,287
Level 3 | Discounted Cash Flow
Quantitative information for Level 3 Fair Value Measurements Assets
Loans held for investment	286
Level 3 | Discounted Cash Flow | Municipal obligations
Quantitative information for Level 3 Fair Value Measurements Assets
Investment securities available-for-sale, estimated fair value	$ 10,886
Level 3 | Discounted Cash Flow | Measurement Input, Discount Rate
Quantitative information for Level 3 Fair Value Measurements Assets
Loans held for investment, measurement input	0.25
Level 3 | Observable Bids | Corporate debt obligations
Quantitative information for Level 3 Fair Value Measurements Assets
Investment securities available-for-sale, estimated fair value	$ 11,017
Level 3 | Minimum | Discounted Cash Flow | Measurement Input, Discount Rate | Municipal obligations
Quantitative information for Level 3 Fair Value Measurements Assets
Debt securities, measurement input	0.000
Level 3 | Minimum | Discounted Cash Flow | Measurement Input, Collateral Value
Quantitative information for Level 3 Fair Value Measurements Assets
Loans held for investment, measurement input	0.00
Level 3 | Maximum | Discounted Cash Flow | Measurement Input, Discount Rate | Municipal obligations
Quantitative information for Level 3 Fair Value Measurements Assets
Debt securities, measurement input	0.0365
Level 3 | Maximum | Discounted Cash Flow | Measurement Input, Collateral Value
Quantitative information for Level 3 Fair Value Measurements Assets
Loans held for investment, measurement input	17,600
Level 3 | Weighted Average | Discounted Cash Flow | Measurement Input, Discount Rate | Municipal obligations
Quantitative information for Level 3 Fair Value Measurements Assets
Debt securities, measurement input	0.0191

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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