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Loans (Details 4) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 61	$ 276
Collectively evaluated for impairment	14,320	13,213
Acquired loans collectively evaluated for impairment	106	103
Total ending allowance balance	14,487	13,592	$ 12,315	$ 10,852
Loans:
Loans individually evaluated for impairment	4,253	5,723
Loans collectively evaluated for impairment	1,614,267	1,480,769
Acquired loans	192,329	248,445
Acquired with deteriorated credit quality	1,097,240	1,021,912
Loans	1,811,539	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	690	903
Commercial real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	6
Collectively evaluated for impairment	5,790	4,981
Acquired loans collectively evaluated for impairment	53	49
Total ending allowance balance	5,843	5,036	4,260	3,577
Loans:
Loans individually evaluated for impairment	561	790
Loans collectively evaluated for impairment	702,226	618,729
Acquired loans	86,431	110,143
Loans	789,413	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	195	262
Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	2	3
Collectively evaluated for impairment	2,309	2,075
Acquired loans collectively evaluated for impairment	12	15
Total ending allowance balance	2,323	2,093	2,011	1,874
Loans:
Loans individually evaluated for impairment	205	223
Loans collectively evaluated for impairment	290,017	264,208
Acquired loans	17,110	26,916
Loans	307,827	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	495	641
Residential real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	59	267
Collectively evaluated for impairment	2,777	2,534
Acquired loans collectively evaluated for impairment	39	36
Total ending allowance balance	2,875	2,837	2,521	2,205
Loans:
Loans individually evaluated for impairment	3,240	4,627
Loans collectively evaluated for impairment	413,446	385,702
Acquired loans	82,615	101,804
Loans	499,301	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	2,708	2,960
Acquired loans collectively evaluated for impairment	2	3
Total ending allowance balance	2,710	2,963	2,848	2,766
Loans:
Loans individually evaluated for impairment	247	83
Loans collectively evaluated for impairment	208,578	212,130
Acquired loans	6,173	9,582
Loans	214,998	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	736	663
Acquired loans collectively evaluated for impairment	0	0
Total ending allowance balance	736	663	$ 675	$ 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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