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Loans (Details 4) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 271		$ 276
Collectively evaluated for impairment	13,829		13,213
Acquired loans collectively evaluated for impairment	122		103
Total ending allowance balance	14,222	$ 13,777	13,592	$ 12,764	$ 12,550	$ 12,315
Loans:
Loans individually evaluated for impairment	5,256		5,723
Loans collectively evaluated for impairment	1,552,887		1,480,769
Acquired loans	221,564		248,445
Acquired with deteriorated credit quality	1,074,864		1,021,912
Loans	1,780,504		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	797		903
Commercial real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	6		6
Collectively evaluated for impairment	5,506		4,981
Acquired loans collectively evaluated for impairment	59		49
Total ending allowance balance	5,571	5,195	5,036	4,339	4,404	4,260
Loans:
Loans individually evaluated for impairment	692		790
Loans collectively evaluated for impairment	674,524		618,729
Acquired loans	99,027		110,143
Loans	774,472		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	229		262
Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	3		3
Collectively evaluated for impairment	2,182		2,075
Acquired loans collectively evaluated for impairment	14		15
Total ending allowance balance	2,199	2,157	2,093	1,937	2,062	2,011
Loans:
Loans individually evaluated for impairment	210		223
Loans collectively evaluated for impairment	277,940		264,208
Acquired loans	21,674		26,916
Loans	300,392		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	568		641
Residential real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	262		267
Collectively evaluated for impairment	2,602		2,534
Acquired loans collectively evaluated for impairment	46		36
Total ending allowance balance	2,910	2,813	2,837	2,651	2,601	2,521
Loans:
Loans individually evaluated for impairment	4,209		4,627
Loans collectively evaluated for impairment	395,343		385,702
Acquired loans	93,229		101,804
Loans	492,781		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	2,752		2,960
Acquired loans collectively evaluated for impairment	3		3
Total ending allowance balance	2,755	2,819	2,963	3,050	2,924	2,848
Loans:
Loans individually evaluated for impairment	145		83
Loans collectively evaluated for impairment	205,080		212,130
Acquired loans	7,634		9,582
Loans	212,859		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	787		663
Acquired loans collectively evaluated for impairment	0		0
Total ending allowance balance	787	$ 793	663	$ 787	$ 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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