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Other Assets - Changes in Amortized MSRs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Changes in amortized mortgage servicing rights    
Balance at beginning of year $ 25,191 $ 13,278
Originations 1,786 1,237
Purchases   14,579
Amortization (5,542) (3,903)
Balance at end of year 21,435 25,191
Fair value of amortized MSRs at end of year 29,676 31,807
Balance of loans serviced for others 3,220,865 3,570,912
Impairment of MSRs recorded $ 0 $ 0