Fair Value - Summary of Carrying Value and Fair Value of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial Assets
Held-to-maturity debt securities	$ 184,484	$ 261,369
Loans, net	5,642,616	5,163,250
Level 1
Financial Assets
Held-to-maturity debt securities	0	0
Time deposits with other banks	0	0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Federal Home Loan Bank (FHLB) borrowings		0
Subordinated debt	0	0
Level 2
Financial Assets
Held-to-maturity debt securities	192,179	262,213
Time deposits with other banks	762	0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Federal Home Loan Bank (FHLB) borrowings		0
Subordinated debt	58,227	64,017
Level 3
Financial Assets
Held-to-maturity debt securities	0	0
Time deposits with other banks	0	3,744
Loans, net	5,686,019	5,139,491
Financial Liabilities
Deposits	6,936,097	5,584,621
Federal Home Loan Bank (FHLB) borrowings		314,995
Subordinated debt	0	0
Carrying Amount
Financial Assets
Held-to-maturity debt securities	184,484	261,369
Time deposits with other banks	750	3,742
Loans, net	5,633,810	5,158,127
Financial Liabilities
Deposits	6,932,561	5,584,753
Federal Home Loan Bank (FHLB) borrowings		315,000
Subordinated debt	$ 71,365	$ 71,085

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Amount of interest-bearing funds deposited into another Federal Home Loan Banks (FHLBanks).

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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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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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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