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Loans (Details 4) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 59		$ 61
Collectively evaluated for impairment	16,779		14,320
Acquired loans collectively evaluated for impairment	122		106
Total ending allowance balance	16,960	$ 14,952	14,487	$ 14,222	$ 13,777	$ 13,592
Loans:
Loans individually evaluated for impairment	4,149		4,253
Loans collectively evaluated for impairment	1,820,451		1,614,267
Acquired loans	317,997		192,329
Acquired with deteriorated credit quality	1,401,397		1,097,240
Loans	2,143,600		1,811,539
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	1,003		690
Commercial real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	7,754		5,790
Acquired loans collectively evaluated for impairment	62		53
Total ending allowance balance	7,816	6,561	5,843	5,571	5,195	5,036
Loans:
Loans individually evaluated for impairment	541		561
Loans collectively evaluated for impairment	726,976		702,226
Acquired loans	159,992		86,431
Loans	888,089		789,413
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	580		195
Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	2		2
Collectively evaluated for impairment	3,217		2,309
Acquired loans collectively evaluated for impairment	13		12
Total ending allowance balance	3,232	2,621	2,323	2,199	2,157	2,093
Loans:
Loans individually evaluated for impairment	202		205
Loans collectively evaluated for impairment	483,243		290,017
Acquired loans	29,440		17,110
Loans	513,308		307,827
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	423		495
Residential real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	57		59
Collectively evaluated for impairment	2,820		2,777
Acquired loans collectively evaluated for impairment	45		39
Total ending allowance balance	2,922	2,911	2,875	2,910	2,813	2,837
Loans:
Loans individually evaluated for impairment	3,162		3,240
Loans collectively evaluated for impairment	403,196		413,446
Acquired loans	121,731		82,615
Loans	528,089		499,301
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	2,638		2,708
Acquired loans collectively evaluated for impairment	2		2
Total ending allowance balance	2,640	2,688	2,710	2,755	2,819	2,963
Loans:
Loans individually evaluated for impairment	244		247
Loans collectively evaluated for impairment	207,036		208,578
Acquired loans	6,834		6,173
Loans	214,114		214,998
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	350		736
Acquired loans collectively evaluated for impairment	0		0
Total ending allowance balance	350	$ 171	736	$ 787	$ 793	$ 663
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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