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Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Residential Mortgage [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Amortized Cost:        
Balance at beginning of period $ 40,195 $ 41,803 $ 40,944 $ 42,148
Originations of mortgage servicing rights 1,508 1,956 2,428 3,513
Amortization (1,829) (2,161) (3,498) (4,063)
Balance at end of period 39,874 41,598 39,874 41,598
Valuation allowance:        
Balance at beginning of period 0 0 0 0
Additions (1,721) 0 (1,721) 0
Balance at end of period (1,721) 0 (1,721) 0
Net MSRs at end of period $ 38,153 $ 41,598 $ 38,153 $ 41,598