Loans and Allowance for Loan Losses - Schedule of Impaired Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Recorded Investment [Abstract]
Recorded investment, total	$ 5,667	$ 7,666
Unpaid Principal Balance [Abstract]
Unpaid principal balance, total	5,787	7,770
Related Allowance [Abstract]
Related allowance	406	403
Average Recorded Investment [Abstract]
Average recorded investment, total	5,704	8,669
Interest Income Recognized [Abstract]
Interest income recognized, total	44	299
Commercial and Industrial [Member]
Recorded Investment [Abstract]
Recorded investment, with no specific allowance recorded	54	61
Recorded investment, with an allowance recorded	452	461
Recorded investment, total	506	522
Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no specific allowance recorded	60	66
Unpaid principal balance, with an allowance recorded	484	493
Unpaid principal balance, total	544	559
Related Allowance [Abstract]
Related allowance	168	176
Average Recorded Investment [Abstract]
Average recorded investment, with no specific allowance recorded	59	84
Average recorded investment, with an allowance recorded	456	587
Average recorded investment, total	515	671
Interest Income Recognized [Abstract]
Interest income recognized, with no specific allowance recorded	0	2
Interest income recognized, with an allowance recorded	4	21
Interest income recognized, total	4	23
Commercial Real Estate [Member]
Recorded Investment [Abstract]
Recorded investment, with no specific allowance recorded	1,361	1,378
Recorded investment, with an allowance recorded	1,806	1,813
Recorded investment, total	3,167	3,191
Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no specific allowance recorded	1,361	1,378
Unpaid principal balance, with an allowance recorded	1,820	1,827
Unpaid principal balance, total	3,181	3,205
Related Allowance [Abstract]
Related allowance	148	159
Average Recorded Investment [Abstract]
Average recorded investment, with no specific allowance recorded	1,370	1,413
Average recorded investment, with an allowance recorded	1,809	1,998
Average recorded investment, total	3,179	3,411
Interest Income Recognized [Abstract]
Interest income recognized, with no specific allowance recorded	19	74
Interest income recognized, with an allowance recorded	9	39
Interest income recognized, total	28	113
Construction and Land [Member]
Recorded Investment [Abstract]
Recorded investment, with no specific allowance recorded	740	2,679
Recorded investment, total	740	2,679
Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no specific allowance recorded	740	2,679
Unpaid principal balance, total	740	2,679
Related Allowance [Abstract]
Related allowance	0	0
Average Recorded Investment [Abstract]
Average recorded investment, with no specific allowance recorded	747	3,289
Average recorded investment, total	747	3,289
Interest Income Recognized [Abstract]
Interest income recognized, with no specific allowance recorded	8	145
Interest income recognized, total	8	145
Residential Real Estate [Member]
Recorded Investment [Abstract]
Recorded investment, with no specific allowance recorded	698	707
Recorded investment, total	698	707
Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no specific allowance recorded	722	727
Unpaid principal balance, total	722	727
Related Allowance [Abstract]
Related allowance	0	0
Average Recorded Investment [Abstract]
Average recorded investment, with no specific allowance recorded	702	720
Average recorded investment, total	702	720
Interest Income Recognized [Abstract]
Interest income recognized, with no specific allowance recorded	4	18
Interest income recognized, total	4	18
Home Equity Lines of Credit [Member]
Recorded Investment [Abstract]
Recorded investment, with an allowance recorded	556	567
Recorded investment, total	556	567
Unpaid Principal Balance [Abstract]
Unpaid principal balance, with an allowance recorded	600	600
Unpaid principal balance, total	600	600
Related Allowance [Abstract]
Related allowance	90	68
Average Recorded Investment [Abstract]
Average recorded investment, with an allowance recorded	561	578
Average recorded investment, total	561	578
Interest Income Recognized [Abstract]
Interest income recognized, with an allowance recorded	0	0
Interest income recognized, total	$ 0	$ 0