Commitments and Contingencies (Summary of Contractual and Notional Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Home Equity Line of Credit [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	$ 464,701	$ 303,815
Commercial And Commercial Real Estate [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	94,791	47,066
Mortgage Loan Commitments [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	16,256	10,975
Letter of Credit [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	4,468	3,103
Other Commitments [Member]
Financial Instruments [Line Items]
Contractual amounts of financial instrument	433	1,305
Customer loan swaps
Financial Instruments [Line Items]
Notional amount of derivative	285,888	58,234
Forward-Starting Interest Rate Swap [Member]
Financial Instruments [Line Items]
Notional amount of derivative	50,000	0
Interest rate swaps
Financial Instruments [Line Items]
Notional amount of derivative	$ 43,000	$ 43,000