Loans and Allowance for Loan Losses (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,490,206	$ 1,772,610	$ 1,580,402
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,023,263	1,423,906
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	364,536	286,954
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	34,720	14,292
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	65,636	45,446
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	2,051	2,012
Residential real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	820,617	585,468	569,819
Residential real estate loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	802,873	572,589
Residential real estate loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,282	3,579
Residential real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	14,462	9,300
Commercial real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	927,951	640,661	541,099
Commercial real estate loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	868,664	606,387
Commercial real estate loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	20,732	4,690
Commercial real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	38,555	29,584
Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Loans	297,721	257,515	179,203
Commercial loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	281,553	244,930
Commercial loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,527	6,023
Commercial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	8,641	6,562
Home equity loans
Financing Receivable, Recorded Investment [Line Items]
Loans	348,634	271,709	272,630
Home equity loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	346,701	269,968
Home equity loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	1,933	1,741
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	17,953	17,257	$ 17,651
Consumer loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	17,835	16,986
Consumer loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	118	$ 271
HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	77,330
HPFC Portfolio Segment [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	70,173
HPFC Portfolio Segment [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	3,179
HPFC Portfolio Segment [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,978