Loan Portfolio and Credit Quality TDR Loans Restructured or Defaulted in Period (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014 Loans		Jun. 30, 2013 Loans		Jun. 30, 2014 Loans		Jun. 30, 2013 Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2		13		3		21
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 115		$ 4,154		$ 287		$ 14,883
Financing Receivable, Modifications, Post-Modification Recorded Investment	115		4,154		296		14,883
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0		3		2		4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		4,110		145		4,671
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0		1	[1]	0		3	[2]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		150	[1]	0		1,369	[2]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0		150	[1]	0		1,369	[2]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0		0		0		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0		0		0
Commercial and industrial [Member] | Temporary Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts							1
Financing Receivable, Modifications, Post-Modification Recorded Investment							200
Commercial and industrial [Member] | Combination of Concessions [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts			1				1
Financing Receivable, Modifications, Post-Modification Recorded Investment			200				200
Commercial and industrial [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts							1
Financing Receivable, Modifications, Post-Modification Recorded Investment							1,000
Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0		0		0		5	[3]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		0		0		9,163	[3]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0		0		0		9,163	[3]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0		2		0		3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		2,994		0		3,555
Commercial real estate [Member] | Combination of Concessions [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts							1
Financing Receivable, Modifications, Post-Modification Recorded Investment							200
Commercial real estate [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts							4
Financing Receivable, Modifications, Post-Modification Recorded Investment							9,000
Construction and land [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0		3	[4]	0		4	[4]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		3,257	[4]	0		3,604	[4]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0		3,257	[4]	0		3,604	[4]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0		0		0		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0		0		0
Construction and land [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts			3				4
Financing Receivable, Modifications, Post-Modification Recorded Investment			3,300				3,600
Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2	[5]	8	[5]	3	[5]	8	[5]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	115	[5]	707	[5]	287	[5]	707	[5]
Financing Receivable, Modifications, Post-Modification Recorded Investment	115	[5]	707	[5]	296	[5]	707	[5]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0		1		2		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		1,116		145		1,116
Residential [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts
Financing Receivable, Modifications, Post-Modification Recorded Investment
Residential [Member] | Temporary Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2		8		3		8
Financing Receivable, Modifications, Post-Modification Recorded Investment	100		700		300		700
Residential [Member] | Combination of Concessions [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts
Financing Receivable, Modifications, Post-Modification Recorded Investment
Residential [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts
Financing Receivable, Modifications, Post-Modification Recorded Investment
Home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0		1	[4]	0		1	[4]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		40	[4]	0		40	[4]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0		40	[4]	0		40	[4]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0		0		0		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0		0		0		0
Home equity [Member] | Extension of Term [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts			1				1
Financing Receivable, Modifications, Post-Modification Recorded Investment			0				0
Consumer and other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0		0		0		0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0		0		0		0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0		0		0		0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0		0		0		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0		$ 0		$ 0		$ 0

[1] Represents the following concessions: combination of concessions.

[2] Represents the following concessions: extension of term (1 loan; post-modification recorded investment of $1.0 million), temporary reduction of interest rate (1 loan; post-modification recorded investment of $0.2 million), and combination of concessions (1 loan; post-modification recorded investment of $0.2 million).

[3] Represents the following concessions: extension of term (4 loans; post-modification recorded investment of $9.0 million) and combination of concessions (1 loan; post-modification recorded investment of $0.2 million).

[4] Represents the following concessions: extension of term.

[5] Represents the following concessions: temporary reduction of interest rate.