v3.19.1

Loans and Allowance for Loan Losses - Impaired Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 1,245	$ 3,539
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,325	5,387
Impaired Financing Receivable, with Related Allowance, Recorded Investment	231	279
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	239	354
Impaired Financing Receivable, with Related Allowance, Related Allowance	94	208
Average Recorded Investment	2,224	3,916	$ 4,839
Interest Income	38	134	161
Interest Foregone on Impaired Loans [Abstract]
Interest income that would have been recognized had impaired loans performed in accordance with their original terms	191	294	243
Less: interest income recognized on impaired loans on a cash basis	(38)	(128)	(120)
Interest income foregone on impaired loans	153	166	123
Real Estate | Commercial property
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		316
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		494
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0
Impaired Financing Receivable, with Related Allowance, Related Allowance		0
Average Recorded Investment	199	396	460
Interest Income	0	5	24
Real Estate | Residential property
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	302	730
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	303	730
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0
Impaired Financing Receivable, with Related Allowance, Related Allowance	0	0
Average Recorded Investment	281	0	0
Interest Income	0	0	0
Real Estate | SBA loan pool securities
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	802	2,158
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	854	3,639
Impaired Financing Receivable, with Related Allowance, Recorded Investment	52	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	50	0
Impaired Financing Receivable, with Related Allowance, Related Allowance	1	0
Average Recorded Investment	1,245	1,982	2,391
Interest Income	22	35	88
Commercial and Industrial | Commercial term
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	68	199
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	69	216
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0
Impaired Financing Receivable, with Related Allowance, Related Allowance	0	0
Average Recorded Investment	112	512	944
Interest Income	8	30	39
Commercial and Industrial | Commercial lines of credit
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		10
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		20
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0
Impaired Financing Receivable, with Related Allowance, Related Allowance		0
Average Recorded Investment	5	431	477
Interest Income	0	39	0
Commercial and Industrial | SBA commercial term
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	73	126
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	99	288
Impaired Financing Receivable, with Related Allowance, Recorded Investment	179	279
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	189	354
Impaired Financing Receivable, with Related Allowance, Related Allowance	93	208
Average Recorded Investment	382	595	567
Interest Income	$ 8	$ 25	$ 10

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