Mortgage Servicing Rights (Details 2) - Residential mortgage loans - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Changes in mortgage servicing assets    
Balance at the beginning of the period $ 4,608 $ 4,733
Additions 205 250
Amortization (332) (393)
Sales 0 0
Carrying value before valuation allowance at end of period 4,481 4,590
Changes in valuation allowance    
Balance at the beginning of the period 0 0
Impairment recoveries 0 0
Balance at the end of the period 0 0
Net carrying value of mortgage servicing rights at end of period 4,481 4,590
Fair value of mortgage servicing rights at end of period 6,353 6,654
Fair value of mortgage servicing rights exceeding the carrying value 1,870 2,060
Mortgage loan contractual servicing fees, including late fees and ancillary income $ 700 $ 720