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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 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Balance sheet assets |  |
Securities available-for-sale | $ 912,429 | $ 1,135,317
Securities held-to-maturity | 488,059 | 181,166
Carrying Amount |  |
Balance sheet assets |  |
Securities held-to-maturity | 487,610 | 181,166
Other investments | 48,764 | 38,044
Loans held-for-sale | 13,564 | 5,570
Loans, net | 7,088,264 | 5,271,049
State tax credits held for sale | 36,853 | 36,802
Balance sheet liabilities |  |
Certificates of deposit | 550,095 | 826,447
Subordinated debentures and notes | 203,637 | 141,258
FHLB advances | 50,000 | 222,406
Other borrowings | 301,081 | 265,172
Estimated fair value |  |
Balance sheet assets |  |
Securities held-to-maturity | 501,523 | 181,939
Other investments | 48,764 | 38,044
Loans held-for-sale | 13,564 | 5,570
Loans, net | 7,067,562 | 5,205,651
State tax credits held for sale | 39,925 | 39,046
Balance sheet liabilities |  |
Certificates of deposit | 553,946 | 825,203
Subordinated debentures and notes | 192,889 | 130,985
FHLB advances | 51,871 | 221,402
Other borrowings | $ 301,081 | $ 265,172

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