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Loans (Details 4) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 162	$ 249
Collectively evaluated for impairment	12,048	10,603
Acquired loans collectively evaluated for impairment	105	0
Total ending allowance balance	12,315	10,852	$ 8,978	$ 7,632
Loans:
Loans individually evaluated for impairment	5,536	7,338
Loans collectively evaluated for impairment	1,259,993	1,048,074
Acquired loans	310,118	370,359
Acquired with deteriorated credit quality	895,561	779,340
Loans	1,577,381	1,427,635
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	1,734	1,864
Commercial real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	86
Collectively evaluated for impairment	4,214	3,491
Acquired loans collectively evaluated for impairment	46	0
Total ending allowance balance	4,260	3,577	3,127	2,676
Loans:
Loans individually evaluated for impairment	658	3,457
Loans collectively evaluated for impairment	497,168	376,632
Acquired loans	131,926	153,228
Loans	630,700	534,285
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	948	968
Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment	4	111
Collectively evaluated for impairment	1,993	1,763
Acquired loans collectively evaluated for impairment	14	0
Total ending allowance balance	2,011	1,874	1,373	1,420
Loans:
Loans individually evaluated for impairment	260	477
Loans collectively evaluated for impairment	225,312	195,146
Acquired loans	38,503	48,536
Loans	264,861	245,055
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	786	896
Residential real estate
Ending allowance balance attributable to loans:
Individually evaluated for impairment	158	52
Collectively evaluated for impairment	2,322	2,153
Acquired loans collectively evaluated for impairment	41	0
Total ending allowance balance	2,521	2,205	1,845	1,689
Loans:
Loans individually evaluated for impairment	4,559	3,308
Loans collectively evaluated for impairment	339,143	280,215
Acquired loans	125,182	146,672
Loans	468,884	430,195
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	2,844	2,766
Acquired loans collectively evaluated for impairment	4	0
Total ending allowance balance	2,848	2,766	2,160	1,663
Loans:
Loans individually evaluated for impairment	59	96
Loans collectively evaluated for impairment	198,370	196,081
Acquired loans	14,507	21,923
Loans	212,936	218,100
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	675	430
Acquired loans collectively evaluated for impairment	0	0
Total ending allowance balance	675	430	$ 473	$ 184
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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