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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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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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