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Loans and the Allowance for Loan Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
ALLL
ALLL, individually evaluated for impairment	$ 110		$ 145
ALLL, collectively evaluated for impairment	28,260		25,599
ALLL, acquired portfolio	1,500
ALLL, acquired with deteriorated credit quality
Total ALLL	29,870	$ 28,401	25,744	$ 37,615	$ 32,763	$ 26,572
Gross loans
Loans Receivable, individually evaluated for impairment	30,835		30,991
Loans Receivable, collectively evaluated for impairment	3,356,822		2,783,922
Loans Receivable, acquired portfolio	499,295		656,448
Loans Receivables, acquired with deteriorated credit quality	5,475		8,080
Total gross loans	3,892,427		3,479,441
Commercial Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	7,716		6,632
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total ALLL	7,716	7,238	6,632	20,396	15,548	10,949
Gross loans
Loans Receivable, individually evaluated for impairment	3,068		3,637
Loans Receivable, collectively evaluated for impairment	618,012		517,869
Loans Receivable, acquired portfolio	15,290		24,972
Loans Receivables, acquired with deteriorated credit quality	5,243		7,098
Total gross loans	641,613		553,576
Commercial Real Estate Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment	110		145
ALLL, collectively evaluated for impairment	15,224		12,438
ALLL, acquired portfolio	1,500
ALLL, acquired with deteriorated credit quality
Total ALLL	16,834	15,389	12,583	11,375	11,371	10,926
Gross loans
Loans Receivable, individually evaluated for impairment	20,861		19,532
Loans Receivable, collectively evaluated for impairment	2,142,385		1,621,745
Loans Receivable, acquired portfolio	421,727		562,451
Loans Receivables, acquired with deteriorated credit quality	232		982
Total gross loans	2,585,205		2,204,710
Commercial Construction Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	3,940		4,789
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total ALLL	3,940	4,241	4,789	4,072	4,040	3,253
Gross loans
Loans Receivable, individually evaluated for impairment	4,340		5,909
Loans Receivable, collectively evaluated for impairment	395,113		478,865
Loans Receivable, acquired portfolio			1,454
Loans Receivables, acquired with deteriorated credit quality
Total gross loans	399,453		486,228
Residential Real Estate Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	1,052		958
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total ALLL	1,052	985	958	1,174	1,091	976
Gross loans
Loans Receivable, individually evaluated for impairment	2,520		1,851
Loans Receivable, collectively evaluated for impairment	199,902		163,686
Loans Receivable, acquired portfolio	61,822		67,010
Loans Receivables, acquired with deteriorated credit quality
Total gross loans	264,244		232,547
Consumer Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	2		3
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total ALLL	2	2	3	4	4	4
Gross loans
Loans Receivable, individually evaluated for impairment	46		62
Loans Receivable, collectively evaluated for impairment	1,410		1,757
Loans Receivable, acquired portfolio	456		561
Loans Receivables, acquired with deteriorated credit quality
Total gross loans	1,912		2,380
Unallocated [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	326		779
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total ALLL	$ 326	$ 546	$ 779	$ 594	$ 709	$ 464

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