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Loans and Allowance for Credit Losses on Loans HFI - Schedule of Loans Outstanding by Class of Financing Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | $ 9,478,129 |  | $ 9,408,783 |  |  |
Less: Allowance for credit losses on loans HFI | (156,260) | $ (155,055) | (150,326) | $ (146,134) | $ (140,664) | $ (134,192)
Net loans held for investment | 9,321,869 |  | 9,258,457 |  |  |
Commercial and industrial |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 1,688,815 |  | 1,720,733 |  |  |
Less: Allowance for credit losses on loans HFI | (24,133) | (22,530) | (19,599) | (17,562) | (11,311) | (11,106)
Construction |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 1,079,726 |  | 1,397,313 |  |  |
Less: Allowance for credit losses on loans HFI | (30,558) | (34,170) | (35,372) | (37,895) | (39,920) | (39,808)
Residential real estate: | 1-to-4 family mortgage |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 1,612,031 |  | 1,568,552 |  |  |
Less: Allowance for credit losses on loans HFI | (25,979) | (25,631) | (26,505) | (25,695) | (27,407) | (26,141)
Residential real estate: | Residential line of credit |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 591,049 |  | 530,912 |  |  |
Less: Allowance for credit losses on loans HFI | (10,724) | (10,097) | (9,468) | (9,163) | (9,185) | (7,494)
Residential real estate: | Multi-family mortgage |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 654,188 |  | 603,804 |  |  |
Less: Allowance for credit losses on loans HFI | (9,644) | (8,810) | (8,842) | (6,848) | (6,828) | (6,490)
Commercial real estate: | Owner-occupied |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 1,324,208 |  | 1,232,071 |  |  |
Less: Allowance for credit losses on loans HFI | (11,567) | (11,312) | (10,653) | (10,526) | (8,467) | (7,783)
Commercial real estate: | Non-owner occupied |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 2,048,036 |  | 1,943,525 |  |  |
Less: Allowance for credit losses on loans HFI | (24,641) | (24,543) | (22,965) | (22,747) | (22,877) | (21,916)
Consumer and other |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Gross loans | 480,076 |  | 411,873 |  |  |
Less: Allowance for credit losses on loans HFI | $ (19,014) | $ (17,962) | $ (16,922) | $ (15,698) | $ (14,669) | $ (13,454)

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