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Loans (Details 4) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 210	$ 162
Collectively evaluated for impairment	12,223	12,048
Acquired loans collectively evaluated for impairment	117	105
Total ending allowance balance	12,550	12,315	$ 11,319	$ 10,852
Loans:
Loans individually evaluated for impairment	5,410	5,536
Loans collectively evaluated for impairment	1,298,643	1,259,993
Acquired loans	293,564	310,118
Acquired with deteriorated credit quality	912,197	895,561
Loans	1,599,339	1,577,381
Receivables Acquired with Deteriorated Credit Quality
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	1,722	1,734
Commercial real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,352	4,214
Acquired loans collectively evaluated for impairment	52	46
Total ending allowance balance	4,404	4,260	3,638	3,577
Loans:
Loans individually evaluated for impairment	537	658
Loans collectively evaluated for impairment	511,423	497,168
Acquired loans	126,721	131,926
Loans	639,668	630,700
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	987	948
Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	3	4
Collectively evaluated for impairment	2,043	1,993
Acquired loans collectively evaluated for impairment	16	14
Total ending allowance balance	2,062	2,011	1,846	1,874
Loans:
Loans individually evaluated for impairment	255	260
Loans collectively evaluated for impairment	237,114	225,312
Acquired loans	34,425	38,503
Loans	272,529	264,861
Commercial | Receivables Acquired with Deteriorated Credit Quality
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	735	786
Residential real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	206	158
Collectively evaluated for impairment	2,350	2,322
Acquired loans collectively evaluated for impairment	45	41
Total ending allowance balance	2,601	2,521	2,321	2,205
Loans:
Loans individually evaluated for impairment	4,553	4,559
Loans collectively evaluated for impairment	347,718	339,143
Acquired loans	119,475	125,182
Loans	471,746	468,884
Residential real estate | Receivables Acquired with Deteriorated Credit Quality
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Consumer
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1	0
Collectively evaluated for impairment	2,919	2,844
Acquired loans collectively evaluated for impairment	4	4
Total ending allowance balance	2,924	2,848	2,813	2,766
Loans:
Loans individually evaluated for impairment	65	59
Loans collectively evaluated for impairment	202,388	198,370
Acquired loans	12,943	14,507
Loans	215,396	212,936
Consumer | Receivables Acquired with Deteriorated Credit Quality
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	0	0
Unallocated
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	559	675
Acquired loans collectively evaluated for impairment	0	0
Total ending allowance balance	559	675	$ 701	$ 430
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	0	0
Acquired loans	0	0
Loans	0	0
Unallocated | Receivables Acquired with Deteriorated Credit Quality
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0	0
Loans:
Acquired with deteriorated credit quality	$ 0	$ 0

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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