Loans Receivable and Credit Quality Loans Text Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Deferred Income	$ 5,900	$ 5,600
Servicing Asset	58,600	79,700
Transfer of Portfolio Loans and Leases to Held-for-sale	0	0	$ 56,967
Gain on sale of loans, net	667	1,207	2,158
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Modifications, Recorded Investment	18,100	30,600
Loans and Leases Receivable, Impaired, Commitment to Lend	0	0
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of Portfolio Loans and Leases to Held-for-sale			57,000
Performing Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 12,400	$ 18,600
Commercial Loans Transferred to Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain on sale of loans, net			$ 1,600