Allowance for Loan and Lease Losses - Changes in Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 10,558	$ 9,941	$ 10,420	$ 9,689	$ 9,689
Charge-offs	(366)	(229)	(892)	(703)	(1,300)
Recoveries	13	99	380	613	789
(Credit) provision	57	197	354	409	1,242
Ending balance	10,262	10,008	10,262	10,008	10,420
Ending balance: related to loans individually evaluated for impairment	225	337	225	337	368
Ending balance: related to loans collectively evaluated for impairment	10,037	9,671	10,037	9,671	10,052
LHFI [Abstract]
Ending balance	605,693	547,087	605,693	547,087	602,009
Ending balance: individually evaluated for impairment	4,968	6,205	4,968	6,205	6,955
Ending balance: collectively evaluated for impairment	600,725	540,882	600,725	540,882	595,054
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,366	3,570	3,295	3,622	3,622
Charge-offs	(59)	0	(79)	(77)	(84)
Recoveries	0	8	0	184	201
(Credit) provision	(146)	(236)	(55)	(387)	(444)
Ending balance	3,161	3,342	3,161	3,342	3,295
Ending balance: related to loans individually evaluated for impairment	0	0	0	0	3
Ending balance: related to loans collectively evaluated for impairment	3,161	3,342	3,161	3,342	3,292
LHFI [Abstract]
Ending balance	258,662	239,776	258,662	239,776	261,561
Ending balance: individually evaluated for impairment	806	879	806	879	904
Ending balance: collectively evaluated for impairment	257,856	238,897	257,856	238,897	260,657
Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,405	1,920	2,294	1,674	1,674
Charge-offs	0	0	0	0	0
Recoveries	0	64	351	258	306
(Credit) provision	(132)	7	(372)	59	314
Ending balance	2,273	1,991	2,273	1,991	2,294
Ending balance: related to loans individually evaluated for impairment	0	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	2,273	1,991	2,273	1,991	2,294
LHFI [Abstract]
Ending balance	84,910	65,385	84,910	65,385	83,369
Ending balance: individually evaluated for impairment	128	145	128	145	144
Ending balance: collectively evaluated for impairment	84,782	65,240	84,782	65,240	83,225
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,378	1,419	1,346	1,513	1,513
Charge-offs	0	0	0	(108)	(107)
Recoveries	0	4	0	127	174
(Credit) provision	(7)	(58)	25	(167)	(234)
Ending balance	1,371	1,365	1,371	1,365	1,346
Ending balance: related to loans individually evaluated for impairment	0	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	1,371	1,365	1,371	1,365	1,346
LHFI [Abstract]
Ending balance	116,200	97,270	116,200	97,270	108,146
Ending balance: individually evaluated for impairment	1,859	2,306	1,859	2,306	2,105
Ending balance: collectively evaluated for impairment	114,341	94,964	114,341	94,964	106,041
Multi-family
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	313	174	263	171	171
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
(Credit) provision	31	57	81	60	92
Ending balance	344	231	344	231	263
Ending balance: related to loans individually evaluated for impairment	0	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	344	231	344	231	263
LHFI [Abstract]
Ending balance	29,030	21,010	29,030	21,010	23,389
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	29,030	21,010	29,030	21,010	23,389
Residential real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	651	586	656	586	586
Charge-offs	(7)	(40)	(8)	(40)	(40)
Recoveries	7	8	15	19	35
(Credit) provision	(28)	93	(40)	82	75
Ending balance	623	647	623	647	656
Ending balance: related to loans individually evaluated for impairment	16	18	16	18	17
Ending balance: related to loans collectively evaluated for impairment	607	629	607	629	639
LHFI [Abstract]
Ending balance	56,363	50,104	56,363	50,104	56,899
Ending balance: individually evaluated for impairment	614	677	614	677	653
Ending balance: collectively evaluated for impairment	55,749	49,427	55,749	49,427	56,246
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,239	1,993	2,295	1,749	1,749
Charge-offs	(300)	(164)	(797)	(447)	(930)
Recoveries	6	9	14	17	57
(Credit) provision	347	214	780	733	1,419
Ending balance	2,292	2,052	2,292	2,052	2,295
Ending balance: related to loans individually evaluated for impairment	195	204	195	204	340
Ending balance: related to loans collectively evaluated for impairment	2,097	1,848	2,097	1,848	1,955
LHFI [Abstract]
Ending balance	56,258	66,898	56,258	66,898	61,838
Ending balance: individually evaluated for impairment	1,059	1,088	1,059	1,088	1,242
Ending balance: collectively evaluated for impairment	55,199	65,810	55,199	65,810	60,596
Tax certificates
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	179	252	242	347	347
Charge-offs	0	(25)	(8)	(31)	(139)
Recoveries	0	6	0	8	14
(Credit) provision	(9)	125	(64)	34	20
Ending balance	170	358	170	358	242
Ending balance: related to loans individually evaluated for impairment	14	115	14	115	8
Ending balance: related to loans collectively evaluated for impairment	156	243	156	243	234
LHFI [Abstract]
Ending balance	1,378	4,390	1,378	4,390	3,705
Ending balance: individually evaluated for impairment	502	1,110	502	1,110	1,907
Ending balance: collectively evaluated for impairment	876	3,280	876	3,280	1,798
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	27	27	29	27	27
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	2
(Credit) provision	1	(5)	(1)	(5)	0
Ending balance	28	22	28	22	29
Ending balance: related to loans individually evaluated for impairment	0	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	28	22	28	22	29
LHFI [Abstract]
Ending balance	2,892	2,254	2,892	2,254	3,102
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	2,892	2,254	2,892	2,254	3,102
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0	0	0	0
Charge-offs	0	0		0	0
Recoveries	0	0		0	0
(Credit) provision	0	0		0	0
Ending balance	0	0	0	0	0
Ending balance: related to loans individually evaluated for impairment	0	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	0	0	0	0	0
LHFI [Abstract]
Ending balance	0	0	0	0	0
Ending balance: individually evaluated for impairment	0	0	0	0	0
Ending balance: collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0	$ 0

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A valuation allowance for financing receivables that are expected to be uncollectible.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of direct write-downs of financing receivables charged against the allowance.

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The balance of financing receivables that were collectively evaluated for impairment.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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