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Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Balance sheet assets |  |
Securities held-to-maturity, net | $ 439,112 | $ 488,059
Carrying Amount |  |
Balance sheet assets |  |
Securities held-to-maturity, net | 438,472 | 487,610
Other investments | 59,156 | 48,764
Loans held for sale | 5,068 | 13,564
Loans, net | 8,964,487 | 7,088,264
State tax credits held for sale | 37,184 | 36,853
Servicing asset | 7,965 | 5,721
Balance sheet liabilities |  |
Certificates of deposit | 627,171 | 550,095
Subordinated debentures and notes | 204,103 | 203,637
FHLB advances | 50,000 | 50,000
Other borrowings and notes payable | 243,770 | 301,081
Estimated fair value |  |
Balance sheet assets |  |
Securities held-to-maturity, net | 444,625 | 501,523
Other investments | 59,156 | 48,764
Loans held for sale | 5,068 | 13,564
Loans, net | 8,954,895 | 7,067,562
State tax credits held for sale | 41,306 | 39,925
Servicing asset | 7,965 | 5,721
Balance sheet liabilities |  |
Certificates of deposit | 628,425 | 553,946
Subordinated debentures and notes | 193,752 | 192,889
FHLB advances | 51,527 | 51,871
Other borrowings and notes payable | $ 243,770 | $ 301,081

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