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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	Mar. 31, 2019	Dec. 31, 2018
Balance sheet assets
Securities available for sale	$ 1,099,185	$ 721,369
Securities held to maturity	64,368	65,679
State tax credits held for sale	0	0
Carrying Amount
Balance sheet assets
Cash and due from banks	85,578	91,511
Federal funds sold	1,934	1,714
Interest-bearing deposits	137,455	106,512
Securities available for sale	1,099,185	721,369
Securities held to maturity	64,368	65,679
Other investments, at cost	34,860	26,654
Loans held for sale	654	392
Derivative financial instruments	6,703	3,023
Portfolio loans, net	4,973,982	4,306,525
State tax credits held for sale	37,215	37,587
Accrued interest receivable	26,276	16,069
Balance sheet liabilities
Deposits	5,537,113	4,587,985
Subordinated debentures and notes	140,668	118,156
Federal Home Loan Bank advances	180,466	70,000
Other borrowings	212,171	223,450
Derivative financial instruments	7,967	3,023
Accrued interest payable	3,231	1,977
Estimated fair value
Balance sheet assets
Cash and due from banks	85,578	91,511
Federal funds sold	1,934	1,714
Interest-bearing deposits	137,455	106,512
Securities available for sale	1,099,185	721,369
Securities held to maturity	64,147	63,934
Other investments, at cost	34,860	26,654
Loans held for sale	654	392
Derivative financial instruments	6,703	3,023
Portfolio loans, net	4,920,761	4,253,239
State tax credits held for sale	39,355	39,169
Accrued interest receivable	26,276	16,069
Balance sheet liabilities
Deposits	5,532,053	4,583,047
Subordinated debentures and notes	131,634	106,316
Federal Home Loan Bank advances	180,463	70,000
Other borrowings	212,026	223,260
Derivative financial instruments	7,967	3,023
Accrued interest payable	$ 3,231	$ 1,977

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