Derivatives - Additional Information (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Jul. 31, 2017 USD ($) InterestRateSwap	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) InterestRateSwap
Derivative [Line Items]
Lock in period for interest rates		45 days
Long-term debt		$ 139,375	$ 143,302
Notional amount	$ 100,000
Interest rate swap maturity date		Jun. 30, 2024
Other Assets
Derivative [Line Items]
Derivative contracts collateral amount		$ 10,896	4,309
Designated as Hedging
Derivative [Line Items]
Notional amount		30,000	130,000
Subordinated Debentures
Derivative [Line Items]
Number of derivative instruments | InterestRateSwap				2
Long-term debt				$ 30,930
Interest Rate Swaps
Derivative [Line Items]
Number of derivative instruments | InterestRateSwap	3
Other comprehensive income to be accreted		1,559
Interest Rate Swaps | Designated as Hedging
Derivative [Line Items]
Fair value of interest rate swap			1,127
Gain on cancellation of swaps, tax-adjusted amount		1,564
Interest Rate Swaps | Subordinated Debentures
Derivative [Line Items]
Notional amount				$ 30,000
Fair value of interest rate swap		$ 1,296	$ 305
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