Fair Value - Summary of Carrying Value and Fair Value of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial Assets
Debt securities held to maturity	$ 357,949	$ 416,863
Loans, net	4,792,791	3,790,255
Quoted Prices in Active Markets for Identical Assets
Financial Assets
Debt securities held to maturity	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	0
Subordinated debt	0	0
Significant Other Observable Inputs
Financial Assets
Debt securities held to maturity	349,895	414,470
Time deposits with other banks	0	0
Loans, net	0	0
Financial Liabilities
Deposits	0	0
Federal Home Loan Bank (FHLB) borrowings	0	0
Subordinated debt	61,224	61,530
Significant Other Unobservable Inputs
Financial Assets
Debt securities held to maturity	0	0
Time deposits with other banks	8,132	12,493
Loans, net	4,835,248	3,760,754
Financial Liabilities
Deposits	5,172,098	4,588,515
Federal Home Loan Bank (FHLB) borrowings	380,027	211,000
Subordinated debt	0	0
Carrying Amount
Financial Assets
Debt securities held to maturity	357,949	416,863
Time deposits with other banks	8,243	12,553
Loans, net	4,784,201	3,786,063
Financial Liabilities
Deposits	5,177,240	4,592,720
Federal Home Loan Bank (FHLB) borrowings	380,000	211,000
Subordinated debt	$ 70,804	$ 70,521

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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