Loans and Credit Quality - Nonaccrual Loans By Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	$ 3,686	$ 4,674
Government guarantees on nonperforming loans	(1,561)	(1,178)
Net nonaccrual loans	2,125	3,496
Commercial
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	3,013	2,031
Real Estate Construction One-To- Four Family
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	191
Real Estate Term Owner Occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	38	135
Real Estate Term Non-Owner Occupied
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	359	1,746
Real Estate Term Other
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	0	39
Consumer Secured By 1st Deed Of Trust
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	256	485
Consumer Other
Nonaccrual Loans By Major Loan Type [Line Items]
Total nonaccrual loans	$ 20	$ 47