Fair Value Disclosures - Narrative (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) property loan	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjustment of contingent consideration	$ 24,000	$ 38,000
Carrying value of impaired loans and leases held for investment	36,922,000		$ 26,581,000
Valuation allowance of impaired loans and leases held for investment	2,444,000		1,415,000
Servicing rights carrying amount before valuation allowance	6,500,000		6,700,000
Servicing rights valuation allowance	$ 3,000		0
Other real estate, number of properties sold | property	2
Proceeds from sales of other real estate owned	$ 670,000	362,000
Other real estate owned	495,000		1,200,000
Girard Partners [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Adjustment of contingent consideration	24,000	$ 38,000
Held for Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation adjustments for loans held for sale	0		0
Carrying value of impaired loans and leases held for investment	36,900,000		26,600,000
Valuation allowance of impaired loans and leases held for investment	2,400,000		1,400,000
Lease Financings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans and leases held for investment	306,000		$ 0
Valuation allowance of impaired loans and leases held for investment	$ 0
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	1
Unrealized gain on loans	$ 17,000