Derivatives - Narrative (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($) derivative_swap	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2019 USD ($) derivative_swap	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items]
Collateral requirement threshold				$ 250,000
Collateral posted	$ 1,700,000			1,700,000		$ 296,000
Derivative notional amount	$ 64,400,000			$ 64,400,000		16,000,000
Number of derivatives | derivative_swap	6			6
Interest rate swap income	$ 734,000	$ 0		$ 734,000	$ 0
Residential Mortgage Holding Company
Derivatives, Fair Value [Line Items]
Commitments to originate mortgage loans held for sale	107,300,000			107,300,000		45,000,000
Variable to Fixed
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 32,200,000			$ 32,200,000
Number of derivatives | derivative_swap	6			6
Fixed to Variable
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 32,200,000			$ 32,200,000
Number of derivatives | derivative_swap	6			6
Subordinated Debt
Derivatives, Fair Value [Line Items]
Junior subordinated debenture			$ 10,000,000.0
Junior subordinated debenture, effective interest rate			3.72%
Debt instrument, interest rate during period				3.78%
Subordinated Debt | LIBOR
Derivatives, Fair Value [Line Items]
Debt instrument, basis spread on variable rate			1.37%
Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash pledged to collateralize fair value exposure on interest rate swap	$ 400,000			$ 400,000		400,000
Unrealized gain (loss) on interest rate swap	$ (374,000)			$ (374,000)		$ 607,000