Fair Value Measurements - Schedule of Estimated Fair Value of Other Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair value of financial instruments
Cash and cash equivalents	$ 79,305	$ 96,050	$ 86,148	$ 67,312
Investment securities available for sale	177,591	132,981
Investment securities held to maturity	360,935	366,041
Other investments	11,222	11,365
Loans - net	3,084,848	2,900,812
Accrued interest receivable	13,698	12,223
Derivatives assets	2,678	3,283
Deposits	3,177,532	3,029,783
Securities sold under agreements to repurchase	60,335	27,639
Other short-term borrowings	101,476	106,230
Subordinated notes payable	59,173	59,111
Junior subordinated debentures	72,166	72,166
Carrying Value
Fair value of financial instruments
Cash and cash equivalents	79,305	96,050
Investment securities available for sale	177,591	132,981
Investment securities held to maturity	360,935	366,041
Other investments	2,174	2,173
Loans - net	3,084,848	2,900,812
Accrued interest receivable	13,698	12,223
Derivatives assets	2,678	3,283
Deposits	3,177,532	3,029,783
Securities sold under agreements to repurchase	60,335	27,639
Other short-term borrowings	101,476	106,230
Accrued interest payable	1,876	1,038
Subordinated notes payable	59,173	59,111
Junior subordinated debentures	72,166	72,166
Derivatives liabilities	9,857	11,225
Total Fair Value
Fair value of financial instruments
Cash and cash equivalents	79,305	96,050
Investment securities available for sale	177,591	132,981
Investment securities held to maturity	360,380	363,178
Other investments	2,174	2,173
Loans - net	3,080,579	2,868,091
Accrued interest receivable	13,698	12,223
Derivatives assets	2,678	3,283
Deposits	3,176,777	3,029,226
Securities sold under agreements to repurchase	56,667	26,101
Other short-term borrowings	101,476	106,230
Accrued interest payable	1,876	1,038
Subordinated notes payable	58,983	58,681
Junior subordinated debentures	72,166	72,166
Derivatives liabilities	$ 9,857	$ 11,225