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
Up to 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
Up to 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
30-90 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
30-90 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
Greater than 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
Greater than 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
Greater than 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