Loans Receivable and Credit Quality Loans by Past Due Status (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing	$ 13,030	$ 34,939
Financing Receivable Recorded Investment 60 to 89 Days Past Due Still Accruing	712	11,437
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	65	3,556
Financing Receivable Recorded Investment Still Accruing	13,807	49,932
Financing Receivable Recorded Investment Nonaccrual Current Payment Status	18,996	38,415
Financing Receivable Recorded Investment Nonaccrual 30 to 89 Days Past Due	2,673	11,030
Financing Receivable Recorded Investment Nonaccrual 90 Days or More Past Due	23,093	11,300
Financing Receivable, Recorded Investment, Nonaccrual Status	44,762	60,745
Financing Receivable, Recorded Investment, Current	5,053,890	4,703,459
Total loans	5,112,459	4,814,136
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing	1,075	10,684	[1]
Financing Receivable Recorded Investment 60 to 89 Days Past Due Still Accruing	454	210
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	257
Financing Receivable Recorded Investment Still Accruing	1,529	11,151
Financing Receivable Recorded Investment Nonaccrual Current Payment Status	1,192	3,073
Financing Receivable Recorded Investment Nonaccrual 30 to 89 Days Past Due	0	0
Financing Receivable Recorded Investment Nonaccrual 90 Days or More Past Due	2,292	1,264
Financing Receivable, Recorded Investment, Nonaccrual Status	3,484	4,337
Financing Receivable, Recorded Investment, Current	861,040	790,838
Total loans	866,053	806,326
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing	775	3,331
Financing Receivable Recorded Investment 60 to 89 Days Past Due Still Accruing	0	4,572
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	3,249
Financing Receivable Recorded Investment Still Accruing	775	11,152
Financing Receivable Recorded Investment Nonaccrual Current Payment Status	13,337	29,125
Financing Receivable Recorded Investment Nonaccrual 30 to 89 Days Past Due	0	8,913
Financing Receivable Recorded Investment Nonaccrual 90 Days or More Past Due	10,630	3,658
Financing Receivable, Recorded Investment, Nonaccrual Status	23,967	41,696
Financing Receivable, Recorded Investment, Current	1,788,652	1,638,502
Total loans	1,813,394	1,691,350
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing	1,631	42
Financing Receivable Recorded Investment 60 to 89 Days Past Due Still Accruing	21	3,216
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	65	50
Financing Receivable Recorded Investment Still Accruing	1,717	3,308
Financing Receivable Recorded Investment Nonaccrual Current Payment Status	392	723
Financing Receivable Recorded Investment Nonaccrual 30 to 89 Days Past Due	43	137
Financing Receivable Recorded Investment Nonaccrual 90 Days or More Past Due	3,054	1,353
Financing Receivable, Recorded Investment, Nonaccrual Status	3,489	2,213
Financing Receivable, Recorded Investment, Current	148,711	132,049
Total loans	153,917	137,570
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing	8,181	20,194
Financing Receivable Recorded Investment 60 to 89 Days Past Due Still Accruing	226	3,218
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable Recorded Investment Still Accruing	8,407	23,412
Financing Receivable Recorded Investment Nonaccrual Current Payment Status	4,058	5,101
Financing Receivable Recorded Investment Nonaccrual 30 to 89 Days Past Due	1,630	1,980
Financing Receivable Recorded Investment Nonaccrual 90 Days or More Past Due	7,089	4,663
Financing Receivable, Recorded Investment, Nonaccrual Status	12,777	11,744
Financing Receivable, Recorded Investment, Current	2,011,110	1,870,933
Total loans	2,032,294	1,906,089
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing	542	119
Financing Receivable Recorded Investment 60 to 89 Days Past Due Still Accruing	4	39
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable Recorded Investment Still Accruing	546	158
Financing Receivable Recorded Investment Nonaccrual Current Payment Status	0	300
Financing Receivable Recorded Investment Nonaccrual 30 to 89 Days Past Due	1,000	0
Financing Receivable Recorded Investment Nonaccrual 90 Days or More Past Due	20	360
Financing Receivable, Recorded Investment, Nonaccrual Status	1,020	660
Financing Receivable, Recorded Investment, Current	112,094	122,733
Total loans	113,660	123,551
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing	826	569
Financing Receivable Recorded Investment 60 to 89 Days Past Due Still Accruing	7	182
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable Recorded Investment Still Accruing	833	751
Financing Receivable Recorded Investment Nonaccrual Current Payment Status	17	93
Financing Receivable Recorded Investment Nonaccrual 30 to 89 Days Past Due	0	0
Financing Receivable Recorded Investment Nonaccrual 90 Days or More Past Due	8	2
Financing Receivable, Recorded Investment, Nonaccrual Status	25	95
Financing Receivable, Recorded Investment, Current	132,283	148,404
Total loans	133,141	149,250
Transferred to Held For Sale Pacific Northwest Transaction [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Loans		1
Financing Receivable Recorded Investment 30 to 59 Days Past Due Still Accruing		$ 300

[1] Does not include one commercial and industrial 30-59 day delinquent loan totaling $0.3 million in loans held for sale as of December 31, 2012.