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Loans and the Allowance for Loan Losses (Details) - Allowance for loan and lease losses - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
ALLL
ALLL, individually evaluated for impairment	$ 672		$ 39
ALLL, collectively evaluated for impairment	31,572		29,909
ALLL, acquired portfolio	1,350		1,800
ALLL, acquired with deteriorated credit quality
Total	33,594	$ 32,529	31,748	$ 28,401	$ 26,901	$ 25,744
Gross loans
Loans Receivable, individually evaluated for impairment	73,322		84,664
Loans Receivable, collectively evaluated for impairment	3,935,114		3,639,851
Loans Receivable, acquired portfolio	352,901		447,612
Loans Receivables, acquired with deteriorated credit quality	2,629		2,683
Total	4,363,966		4,174,810
Commercial Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	8,760		8,032
ALLL, acquired portfolio	200		200
ALLL, acquired with deteriorated credit quality
Total	8,960	8,550	8,232	7,238	6,667	6,632
Gross loans
Loans Receivable, individually evaluated for impairment	31,301		49,761
Loans Receivable, collectively evaluated for impairment	809,832		757,923
Loans Receivable, acquired portfolio	9,867		13,715
Loans Receivables, acquired with deteriorated credit quality	2,629		2,683
Total	853,629		824,082
Commercial Real Estate Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment	672		39
ALLL, collectively evaluated for impairment	16,399		15,472
ALLL, acquired portfolio	1,150		1,600
ALLL, acquired with deteriorated credit quality
Total	18,221	17,435	17,111	15,389	14,118	12,583
Gross loans
Loans Receivable, individually evaluated for impairment	31,893		25,038
Loans Receivable, collectively evaluated for impairment	2,391,316		2,190,686
Loans Receivable, acquired portfolio	294,435		377,185
Loans Receivables, acquired with deteriorated credit quality
Total	2,717,644		2,592,909
Commercial Construction Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	4,812		4,747
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total	4,812	4,772	4,747	4,241	4,574	4,789
Gross loans
Loans Receivable, individually evaluated for impairment	7,600		6,662
Loans Receivable, collectively evaluated for impairment	491,007		476,554
Loans Receivable, acquired portfolio
Loans Receivables, acquired with deteriorated credit quality
Total	498,607		483,216
Residential Real Estate Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	1,167		1,051
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total	1,167	1,109	1,051	985	1,008	958
Gross loans
Loans Receivable, individually evaluated for impairment	2,528		3,203
Loans Receivable, collectively evaluated for impairment	237,726		212,350
Loans Receivable, acquired portfolio	48,195		56,242
Loans Receivables, acquired with deteriorated credit quality
Total	288,449		271,795
Consumer Portfolio Segment [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	3		2
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total	3	2	2	2	3	3
Gross loans
Loans Receivable, individually evaluated for impairment
Loans Receivable, collectively evaluated for impairment	5,233		2,338
Loans Receivable, acquired portfolio	404		470
Loans Receivables, acquired with deteriorated credit quality
Total	5,637		2,808
Unallocated [Member]
ALLL
ALLL, individually evaluated for impairment
ALLL, collectively evaluated for impairment	431		605
ALLL, acquired portfolio
ALLL, acquired with deteriorated credit quality
Total	$ 431	$ 661	$ 605	$ 546	$ 531	$ 779

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