Transfers of Financial Assets - Disaggregation of Gross Amount of Recognized Liabilities for Repurchase Agreements by Class of Collateral (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	$ 9,151
Collateralized mortgage obligations: Government agency
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	6,151
Government-sponsored enterprises mortgage-backed securities
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	3,000
Less than 30 days
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	1,200
Less than 30 days | Collateralized mortgage obligations: Government agency
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	1,200
30 through 90 days
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	2,000
30 through 90 days | Government-sponsored enterprises mortgage-backed securities
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	2,000
Maturing Over 90 days
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	5,951
Maturing Over 90 days | Collateralized mortgage obligations: Government agency
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	4,951
Maturing Over 90 days | Government-sponsored enterprises mortgage-backed securities
Disaggregation of the gross amount of recognized liabilities for repurchase agreements by the class of collateral pledged
Recognized liabilities for repurchase agreements	$ 1,000