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Loans (Details 4) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 270	$ 276
Collectively evaluated for impairment	13,431	13,213
Acquired loans collectively evaluated for impairment	76	103
Total ending allowance balance	13,777	13,592	$ 12,550	$ 12,315
Loans:
Loans individually evaluated for impairment	5,524	5,723
Loans collectively evaluated for impairment	1,500,155	1,480,769
Acquired loans	237,123	248,445
Acquired with deteriorated credit quality	1,040,644	1,021,912
Loans	1,743,651	1,735,840
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	849	903
Commercial real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	6	6
Collectively evaluated for impairment	5,151	4,981
Acquired loans collectively evaluated for impairment	38	49
Total ending allowance balance	5,195	5,036	4,404	4,260
Loans:
Loans individually evaluated for impairment	623	790
Loans collectively evaluated for impairment	635,532	618,729
Acquired loans	106,724	110,143
Loans	743,124	729,924
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	245	262
Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	3	3
Collectively evaluated for impairment	2,144	2,075
Acquired loans collectively evaluated for impairment	10	15
Total ending allowance balance	2,157	2,093	2,062	2,011
Loans:
Loans individually evaluated for impairment	213	223
Loans collectively evaluated for impairment	272,663	264,208
Acquired loans	24,040	26,916
Loans	297,520	291,988
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	604	641
Residential real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	261	267
Collectively evaluated for impairment	2,526	2,534
Acquired loans collectively evaluated for impairment	26	36
Total ending allowance balance	2,813	2,837	2,601	2,521
Loans:
Loans individually evaluated for impairment	4,538	4,627
Loans collectively evaluated for impairment	385,831	385,702
Acquired loans	97,738	101,804
Loans	488,107	492,133
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	0	0
Collectively evaluated for impairment	2,817	2,960
Acquired loans collectively evaluated for impairment	2	3
Total ending allowance balance	2,819	2,963	2,924	2,848
Loans:
Loans individually evaluated for impairment	150	83
Loans collectively evaluated for impairment	206,129	212,130
Acquired loans	8,621	9,582
Loans	214,900	221,795
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	793	663
Acquired loans collectively evaluated for impairment	0	0
Total ending allowance balance	793	663	$ 559	$ 675
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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