Loans and the Allowance for Loan and Lease Losses (Details) - Aging analysis - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 2,395	$ 12,848
60-89 Days Past Due	4,143	849
90 Days or Greater Past Due	10,588	9,823
Total Past Due	17,126	23,519
Current	2,750,089	2,516,012
Total Loans Receivable	2,767,215	2,539,531
Loans Receivable > 90 Days Past Due and Accruing		1,211
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	500	6,060
60-89 Days Past Due	497
90 Days or Greater Past Due	4,812	662
Total Past Due	5,809	6,722
Current	563,160	493,094
Total Loans Receivable	568,969	499,816
Loans Receivable > 90 Days Past Due and Accruing		45
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,298	4,937
60-89 Days Past Due	1,647	638
90 Days or Greater Past Due	3,478	5,961
Total Past Due	6,423	11,535
Current	1,744,968	1,622,975
Total Loans Receivable	1,751,391	1,634,510
Loans Receivable > 90 Days Past Due and Accruing		609
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	220,267	167,359
Total Loans Receivable	220,267	167,359
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	597	1,821
60-89 Days Past Due	1,999	210
90 Days or Greater Past Due	2,298	3,200
Total Past Due	4,894	5,231
Current	219,240	229,736
Total Loans Receivable	224,134	234,967
Loans Receivable > 90 Days Past Due and Accruing		557
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		30
60-89 Days Past Due		1
Total Past Due		31
Current	2,454	2,848
Total Loans Receivable	$ 2,454	$ 2,879