Off Balance sheets Activities and Derivatives - Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commitments to originate loans for portfolio
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	$ 18,955	$ 14,905
Commitments to originate loans to be sold
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	29,907	13,142
Commitments to purchase loans from third parties
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	5,195	5,988
Unfunded commitments under home equity lines of credit
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	52,102	51,639
Unfunded commitments under commercial lines of credit
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	13,300	11,542
Unfunded commitments under SBA lines of credit
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	4,243	4,340
Unfunded commitments under overdraft lines of credit
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	176	181
Unadvanced funds on construction loans
Loan Commitments
Outstanding financial instruments whose contract amounts represent credit risk	$ 4,009	$ 7,225