Loans and Credit Quality - Troubled Debt Restructured Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring recorded investment	$ 10,178
Existing troubled debt restructurings	3,562
Total modifications	13,740	$ 7,700
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring recorded investment	10,178
Accrual Status
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring recorded investment	8,891
Existing troubled debt restructurings	2,914
Total modifications	11,805
Accrual Status | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring recorded investment	8,891
Nonaccrual Status
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring recorded investment	1,287
Existing troubled debt restructurings	648
Total modifications	1,935
Nonaccrual Status | Commercial | Asset Quality Rating - Substandard
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring recorded investment	$ 1,287