Fair Value Disclosures - Narrative (Details)	9 Months Ended
	Sep. 30, 2018 USD ($) loan property	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjustment of Contingent Consideration	$ 38,000	$ (260,000)
Valuation adjustments for loans held for sale	0	0
Carrying value of impaired loans and leases held for investment	28,722,000		$ 28,482,000
Valuation allowance of impaired loans held for investment	1,048,000		131,000
Servicing rights carrying amount before valuation allowance	6,700,000		6,573,000
Servicing rights valuation allowance	0		0
Impaired loans with no related reserve, Recorded Investment	$ 15,313,000		27,454,000
Number of properties written-down | property	2
OREO write-downs	$ 503,000
number of properties transferred | property	4
Transfer of loans to other real estate owned	$ 477,000	649,000
Other Real Estate, Number of Properties Sold | property	3
Proceeds from sales of other real estate owned	$ 362,000	3,996,000
Other real estate owned	1,433,000		1,843,000
Sterner Insurance Associates Inc [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjustment of Contingent Consideration		(301,000)
Girard Partners [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjustment of Contingent Consideration	38,000	$ 41,000
Held for Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans and leases held for investment	28,700,000
Valuation allowance of impaired loans held for investment	1,048,000		131,000
Lease Financings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation allowance of impaired loans held for investment	0		0
Impaired loans with no related reserve, Recorded Investment	$ 1,300,000		$ 1,300,000
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of loans with unrealized gain | loan	2
Unrealized gain on loans	$ 6,000