Derivatives - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) derivative_swap	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) derivative_swap	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Derivatives, Fair Value [Line Items]
Collateral requirement threshold			$ 250,000
Collateral posted	$ 10,700,000		10,700,000		$ 4,700,000
Derivative notional amount	$ 172,800,000		$ 172,800,000		94,400,000
Number of derivatives | derivative_swap	13		13
Interest rate swap income	$ 726,000	$ 0	$ 743,000	$ 734,000
Residential Mortgage Holding Company
Derivatives, Fair Value [Line Items]
Commitments to originate mortgage loans held for sale	257,300,000		257,300,000		48,800,000
Subordinated Debt
Derivatives, Fair Value [Line Items]
Junior subordinated debenture	$ 10,000,000.0		$ 10,000,000.0
Junior subordinated debenture, effective interest rate (percent)	3.72%		3.72%
Debt instrument, interest rate during period (percent)			1.62%
Subordinated Debt | LIBOR
Derivatives, Fair Value [Line Items]
Debt instrument, basis spread on variable rate (percent)			1.37%
Variable to Fixed
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 86,400,000		$ 86,400,000
Number of derivatives | derivative_swap	13		13
Fixed to Variable
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 86,400,000		$ 86,400,000
Number of derivatives | derivative_swap	13		13
Interest rate swaps | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Cash pledged to collateralize fair value exposure on interest rate swap	$ 2,900,000		$ 2,900,000		1,300,000
Unrealized gain (loss) on interest rate swap	$ 2,200,000		$ 2,200,000		$ 534,000