Derivative Financial Instruments - Interest Swap Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 625,491	$ 174,359
Derivative, fair value	(11,087)	(354)
Interest rate swaps assets | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 524,126	$ 141,135
Weighted Average Remaining Maturity (years)	6 years 3 months 18 days	7 years 6 months
Fair Value	$ (4,790)	$ (271)
Weighted-Average Rate	2.80%	2.41%
Cash pledged as collateral	$ 7,000	$ 700
Loans | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value	4,961	263
Loans | Interest rate swaps assets | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 435,926	$ 91,135
Weighted Average Remaining Maturity (years)	6 years 6 months	7 years 10 months 24 days
Fair Value	$ (5,025)	$ (263)
Weighted-Average Rate	2.86%	2.44%
Securities available-for-sale | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value	$ (229)	$ 8
Securities available-for-sale | Interest rate swaps assets | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 88,200	$ 50,000
Weighted Average Remaining Maturity (years)	5 years 1 month 6 days	6 years 9 months 18 days
Fair Value	$ 235	$ (8)
Weighted-Average Rate	2.54%	2.33%
3 Month LIBOR | Interest rate swaps assets | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 110,000
Weighted Average Remaining Maturity (years)	8 years 1 month 6 days
Derivative, fair value	$ (2,293)
Derivative, variable interest rate	2.88%
1 Month LIBOR | Interest rate swaps assets | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value	$ 100,000
Weighted Average Remaining Maturity (years)	5 years
Derivative, fair value	$ (2,065)
Derivative, variable interest rate	2.88%