Derivatives - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2017 USD ($) derivative	Mar. 31, 2018 USD ($)	Sep. 30, 2020 USD ($) derivative	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Notional Amount	$ 100,000
Long-term debt			$ 438,838	$ 304,675
Stockholders' equity			1,244,998	762,329
Cash collateral pledged on derivatives			$ 76,063	33,616
Subordinated debt
Derivative [Line Items]
Number of derivative instruments | derivative			2
Long-term debt			$ 30,930
Interest rate swaps
Derivative [Line Items]
Number of derivative instruments | derivative	3
Interest rate swaps | Designated as hedging:
Derivative [Line Items]
Notional Amount			30,000	30,000
Interest rate swaps | Subordinated debt
Derivative [Line Items]
Notional Amount			30,000
Fair value of interest rate swap			(2,063)	(515)
Interest rate swaps three
Derivative [Line Items]
Notional Amount	$ 30,000
Derivative notional amount maturity period	3 years
Interest rate swaps four
Derivative [Line Items]
Notional Amount	$ 35,000
Derivative notional amount maturity period	4 years
Interest rate swaps five
Derivative [Line Items]
Notional Amount	$ 35,000
Derivative notional amount maturity period	5 years
Gain on canceled derivatives		$ 1,564
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Derivative [Line Items]
Stockholders' equity			$ 545	$ 955
London Interbank Offered Rate (LIBOR) | Interest rate swaps | Subordinated debt
Derivative [Line Items]
Variable interest rate			2.08%