Fair Value Measurements - Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable	$ 585,737	$ 564,667
Nonrecurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Management adjustments for depreciation in values depending on property types (percent)		11.00%
Nonrecurring | Impaired loans | Commercial and industrial
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable		$ 7,019
Nonrecurring | Impaired loans | Equity loans and lines of credit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable		$ 777
Nonrecurring | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Appraiser adjustments on sales comparable data (percent)	0.00%	0.00%
Management adjustments for depreciation in values depending on property types (percent)	8.00%
Nonrecurring | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Appraiser adjustments on sales comparable data (percent)	6.00%	3.50%
Management adjustments for depreciation in values depending on property types (percent)	25.00%