Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) loans	Mar. 31, 2015 USD ($) loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	43	28
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,677,000	$ 11,317,000
Extended Maturity Without Rate Concession [Member] | Commercial - Secured [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 830,000	$ 6,776,000
Extended Maturity Without Rate Concession [Member] | Commercial - unsecured [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 103,000	$ 42,000
Extended Maturity Without Rate Concession [Member] | Real-estate commercial mortage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 2,495,000
Extended Maturity Without Rate Concession [Member] | Real-estate - residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 225,000
Extended Maturity Without Rate Concession [Member] | Construction - commercial residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 889,000
Extended Maturity With Rate Concession [Member] | Real-estate - home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 44,000	$ 0
Extended Maturity With Rate Concession [Member] | Real-estate - residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 104,000
Bankruptcy [Member] | Real-estate - home equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	37	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,698,000	$ 492,000
Bankruptcy [Member] | Real-estate - residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 281,000
Bankruptcy [Member] | Consumer - direct [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,000	$ 0
Bankruptcy [Member] | Consumer - Indirect [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 13,000