Derivative Financial Instruments - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) interest_rate_swap interest_rate_cap instrument	Dec. 31, 2018 USD ($) interest_rate_swap interest_rate_cap
Derivative [Line Items]
Estimated amount to be transferred from accumulated other comprehensive income to earnings	$ 438
Termination value of derivatives in a net liability position	26,045
Derivative collateral posted	28,405
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 548,951
Federal Home Loan Bank Advances
Derivative [Line Items]
Number of debt instruments held | instrument	2
Interest rate contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Increase in derivative assets	$ 13,100
Increase in derivative liabilities	14,000
Increase in outstanding notional balance	$ 71,200
Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Number of interest rate derivatives held | interest_rate_swap	4	4
Notional amount of interest rate derivatives	$ 46,000	$ 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	$ 20,000
Cash Flow Hedging | Interest Rate Cap
Derivative [Line Items]
Number of interest rate derivatives held | interest_rate_cap	1	1
Notional amount of interest rate derivatives	$ 13,000	$ 13,000
Cash Flow Hedging | Interest Rate Cap | Trust Preferred Debt
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 13,000