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Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Mortgage - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Amortized cost:    
Balance at beginning of year $ 38,822 $ 40,944
Originations of mortgage servicing rights 4,968 5,485
Amortization expense (6,127) (7,607)
Balance at end of year 37,663 38,822
Valuation allowance:    
Balance at beginning of year (1,291) 0
Net deductions (additions) to the valuation allowance 1,291 (1,291)
Balance at end of year 0 (1,291)
Net MSRs at end of year 37,663 $ 37,531
Amortization [Abstract]    
2017 6,342  
2018 5,905  
2019 5,423  
2020 4,893  
2021 $ 4,311