Loans and Allowance for Loan Losses (Loan Aging Analysis by Portfolio Segment (Including Loans Past Due Over Ninety Days and Non Accrual Loans) and Summary of Non Accrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 23,212	$ 15,902
Current	2,466,994	1,756,708
Total loan balances	2,490,206	1,772,610	$ 1,580,402
Non-Accrual Loans	18,322	16,639
Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,973	6,163
Current	810,644	579,305
Total loan balances	820,617	585,468	569,819
Non-Accrual Loans	7,253	6,056
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,230	5,487
Current	919,721	635,174
Total loan balances	927,951	640,661	541,099
Non-Accrual Loans	4,529	7,043
Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,819	1,864
Current	295,902	255,651
Total loan balances	297,721	257,515	179,203
Non-Accrual Loans	4,489	1,529
Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,788	2,106
Current	345,846	269,603
Total loan balances	348,634	271,709	272,630
Non-Accrual Loans	1,933	1,740
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	237	282
Current	17,716	16,975
Total loan balances	17,953	17,257	$ 17,651
Non-Accrual Loans	118	271
HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	165
Current	77,165
Total loan balances	77,330
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,286	10,844
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,077	4,531
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,584	3,791
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,002	1,139
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,505	1,129
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	118	254
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,195	783
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	571	426
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,427
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	550	269
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	640	88
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,731	4,275
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,325	1,206
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,219	1,696
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	267	456
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	643	889
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	112	$ 28
Financing Receivables, 30 to 59 Days Past Due [Member] | HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 165