Allowance for Loan and Lease Losses - Individually Impaired Loans (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	$ 13,391	$ 13,851
With an Allowance Recorded Recorded Investment	[2]	13,163	13,138
With an Allowance Recorded Related Allowance		2,059	2,008
With an Allowance Recorded Average Recorded Investment		13,467	13,243
With an Allowance Recorded Interest Income Recognized	[3]	436	689
With no Related Allowance Recorded Unpaid Principal Balance	[1]	2,879	3,199
With no Related Allowance Recorded Recorded Investment	[2]	2,624	2,934
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		2,681	3,637
With no Related Allowance Recorded Interest Income Recognized	[3]	4	4
Individually impaired loans Unpaid Principal Balance	[1]	16,270	17,050
Total impaired loans	[2]	15,787	16,072
Individually impaired loans Related Allowance		2,059	2,008
Individually impaired loans Average Recorded Investment		16,148	16,880
Individually impaired loans Interest Income Recognized	[3]	440	693
Real Estate Sector [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	11,853	11,308
With an Allowance Recorded Recorded Investment	[2]	11,682	10,834
With an Allowance Recorded Related Allowance		1,691	938
With an Allowance Recorded Average Recorded Investment		11,848	10,860
With an Allowance Recorded Interest Income Recognized	[3]	369	588
With no Related Allowance Recorded Unpaid Principal Balance	[1]	2,802	2,779
With no Related Allowance Recorded Recorded Investment	[2]	2,583	2,667
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		2,626	3,457
With no Related Allowance Recorded Interest Income Recognized	[3]	3	3
Real Estate Sector [Member] | Other construction/land [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	505	593
With an Allowance Recorded Recorded Investment	[2]	387	438
With an Allowance Recorded Related Allowance		86	44
With an Allowance Recorded Average Recorded Investment		402	458
With an Allowance Recorded Interest Income Recognized	[3]	23	40
With no Related Allowance Recorded Unpaid Principal Balance	[1]	54	54
With no Related Allowance Recorded Recorded Investment	[2]	18	50
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		21	32
With no Related Allowance Recorded Interest Income Recognized	[3]	3	0
Real Estate Sector [Member] | 1-4 Family - Closed-End [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	2,858	3,325
With an Allowance Recorded Recorded Investment	[2]	2,857	3,325
With an Allowance Recorded Related Allowance		75	75
With an Allowance Recorded Average Recorded Investment		2,916	3,221
With an Allowance Recorded Interest Income Recognized	[3]	113	175
With no Related Allowance Recorded Unpaid Principal Balance	[1]	995	357
With no Related Allowance Recorded Recorded Investment	[2]	957	307
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		968	584
With no Related Allowance Recorded Interest Income Recognized	[3]	0	3
Real Estate Sector [Member] | Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	4,714	4,603
With an Allowance Recorded Recorded Investment	[2]	4,662	4,550
With an Allowance Recorded Related Allowance		592	656
With an Allowance Recorded Average Recorded Investment		4,699	4,563
With an Allowance Recorded Interest Income Recognized	[3]	188	206
With no Related Allowance Recorded Unpaid Principal Balance	[1]	158	224
With no Related Allowance Recorded Recorded Investment	[2]	133	166
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		138	222
With no Related Allowance Recorded Interest Income Recognized	[3]	0	0
Real Estate Sector [Member] | Multi-Family Residential [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	357	373
With an Allowance Recorded Recorded Investment	[2]	357	373
With an Allowance Recorded Related Allowance		19	25
With an Allowance Recorded Average Recorded Investment		364	379
With an Allowance Recorded Interest Income Recognized	[3]	17	20
Real Estate Sector [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	600	842
With an Allowance Recorded Recorded Investment	[2]	600	723
With an Allowance Recorded Related Allowance		9	135
With an Allowance Recorded Average Recorded Investment		609	757
With an Allowance Recorded Interest Income Recognized	[3]	28	40
With no Related Allowance Recorded Unpaid Principal Balance	[1]	1,570	502
With no Related Allowance Recorded Recorded Investment	[2]	1,450	502
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		1,473	181
With no Related Allowance Recorded Interest Income Recognized	[3]	0	0
Real Estate Sector [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	2,819	1,572
With an Allowance Recorded Recorded Investment	[2]	2,819	1,425
With an Allowance Recorded Related Allowance		910	3
With an Allowance Recorded Average Recorded Investment		2,858	1,482
With an Allowance Recorded Interest Income Recognized	[3]	0	107
With no Related Allowance Recorded Unpaid Principal Balance	[1]	0	0
With no Related Allowance Recorded Recorded Investment	[2]	0	0
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		0	2,004
With no Related Allowance Recorded Interest Income Recognized	[3]	0	0
Real Estate Sector [Member] | Farmland [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	0
With an Allowance Recorded Recorded Investment	[2]	0
With an Allowance Recorded Related Allowance		0
With an Allowance Recorded Average Recorded Investment		0
With an Allowance Recorded Interest Income Recognized	[3]	0
With no Related Allowance Recorded Unpaid Principal Balance	[1]	25	1,642
With no Related Allowance Recorded Recorded Investment	[2]	25	1,642
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		26	434
With no Related Allowance Recorded Interest Income Recognized	[3]	0	0
Agricultural Sector [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	5	6
With an Allowance Recorded Recorded Investment	[2]	6	6
With an Allowance Recorded Related Allowance		1	1
With an Allowance Recorded Average Recorded Investment		6	3
With an Allowance Recorded Interest Income Recognized	[3]	0	0
With no Related Allowance Recorded Unpaid Principal Balance	[1]	0	0
With no Related Allowance Recorded Recorded Investment	[2]	0	0
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		0	139
With no Related Allowance Recorded Interest Income Recognized	[3]	0	0
Commercial and Industrial Sector [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	788	1,724
With an Allowance Recorded Recorded Investment	[2]	769	1,534
With an Allowance Recorded Related Allowance		133	918
With an Allowance Recorded Average Recorded Investment		893	1,573
With an Allowance Recorded Interest Income Recognized	[3]	27	40
With no Related Allowance Recorded Unpaid Principal Balance	[1]	62	238
With no Related Allowance Recorded Recorded Investment	[2]	41	211
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		55	0
With no Related Allowance Recorded Interest Income Recognized	[3]	0	0
Consumer Loans Sector [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance Recorded Unpaid Principal Balance	[1]	745	813
With an Allowance Recorded Recorded Investment	[2]	706	764
With an Allowance Recorded Related Allowance		234	151
With an Allowance Recorded Average Recorded Investment		720	807
With an Allowance Recorded Interest Income Recognized	[3]	40	61
With no Related Allowance Recorded Unpaid Principal Balance	[1]	15	182
With no Related Allowance Recorded Recorded Investment	[2]	0	56
With no Related Allowance Recorded Related Allowance		0	0
With no Related Allowance Recorded Average Recorded Investment		0	41
With no Related Allowance Recorded Interest Income Recognized	[3]	$ 1	$ 1

[1] Contractual principal balance due from customer.

[2] Principal balance on Company’s books, less any direct charge offs.

[3] Interest income is recognized on performing balances on a regular accrual basis