Derivatives - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) swap	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items]
Threshold for collateral requirements	$ 250,000
Collateral posted	10,700,000	$ 4,700,000
Notional amount	$ 196,000,000.0	94,400,000
Number of instruments | swap	32
Interest rate swap income	$ 949,000	964,000	$ 84,000
Commitments to originate loans held for sale	150,276,000	48,796,000
RML
Derivatives, Fair Value [Line Items]
Commitments to originate loans held for sale	150,300,000	48,800,000
Subordinated Debt
Derivatives, Fair Value [Line Items]
Junior subordinated debenture	$ 10,000,000.0
Effective interest rate on junior subordinated debenture	3.72%
Debt instrument, interest rate during period	1.59%
Subordinated Debt | LIBOR
Derivatives, Fair Value [Line Items]
Debt instrument, basis spread on variable rate	1.37%
Variable to Fixed
Derivatives, Fair Value [Line Items]
Notional amount	$ 98,000,000.0
Number of instruments | swap	16
Fixed to Variable
Derivatives, Fair Value [Line Items]
Notional amount	$ 98,000,000.0
Number of instruments | swap	16
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	1,300,000
Unrealized loss on interest rate swap	$ 1,700,000	$ 534,000