Derivative Financial Instruments - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) interest_rate_swap instrument	Dec. 31, 2019 USD ($) interest_rate_swap
Derivative [Line Items]
Estimated amount to be transferred from accumulated other comprehensive income to earnings	$ 1,016
Termination value of derivatives in a net liability position	81,962
Derivative collateral posted	75,415
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 878,640	$ 692,287
Federal Home Loan Bank Advances
Derivative [Line Items]
Number of debt instruments held | instrument	1
Interest rate contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Increase in derivative assets	$ 54,200
Increase in derivative liabilities	55,000
Increase in outstanding notional balance	$ 176,400
Cash Flow Hedging | Interest rate swap
Derivative [Line Items]
Number of interest rate derivatives held | interest_rate_swap	3	4
Notional amount of interest rate derivatives	$ 36,000	$ 46,000
Cash Flow Hedging | Interest rate swap | Trust Preferred Debt
Derivative [Line Items]
Notional amount of interest rate derivatives	26,000
Cash Flow Hedging | Interest rate swap | Federal Home Loan Bank Advances
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 10,000