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Fair Value Measurements (Details 1) - Recurring - Significant Unobservable Inputs (Level 3) - Mortgage servicing rights - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair value of assets    
Balance at beginning of period $ 2,847 $ 2,762
Total gains or losses (realized/unrealized) included in earnings (529) (301)
Total gains or losses (realized/unrealized) included in other comprehensive income 0 0
Purchases 0 0
Sales 0 0
Issues 266 386
Settlements 0 0
Balance at end of period $ 2,584 $ 2,847