Loans and the Allowance for Loan and Lease Losses (Details) - Aging analysis - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 1,704	$ 12,848
60-89 Days Past Due	12,399	849
90 Days or Greater Past Due	12,975	9,823
Total Past Due	27,078	23,520
Current	2,928,591	2,516,011
Total Loans Receivable	2,955,669	2,539,531
Loans Receivable > 90 Days Past Due and Accruing	268	1,211
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		6,060
60-89 Days Past Due	9,726
90 Days or Greater Past Due	5,020	662
Total Past Due	14,746	6,722
Current	554,859	493,094
Total Loans Receivable	569,605	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	782	4,937
60-89 Days Past Due	1,365	638
90 Days or Greater Past Due	3,232	5,961
Total Past Due	5,379	11,535
Current	1,868,335	1,622,975
Total Loans Receivable	1,873,714	1,634,510
Loans Receivable > 90 Days Past Due and Accruing		609
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days or Greater Past Due	1,479
Total Past Due	1,479
Current	282,144	167,359
Total Loans Receivable	283,623	167,359
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	922	1,821
60-89 Days Past Due	1,308	210
90 Days or Greater Past Due	3,244	3,200
Total Past Due	5,474	5,231
Current	219,684	229,736
Total Loans Receivable	225,158	234,967
Loans Receivable > 90 Days Past Due and Accruing	268	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	3,569	2,848
Total Loans Receivable	$ 3,569	$ 2,879