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Disclosures about Fair Value of Assets and Liabilities - Reconciliation of Unobservable Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative liabilities | Interest Rate Lock Commitments        
Reconciliation of significant unobservable inputs, liabilities:        
Balance, beginning of period $ 7      
Changes in fair value (7)      
Mortgage servicing rights        
Reconciliation of significant unobservable inputs, assets:        
Balance, beginning of period 70,085 $ 57,557 $ 66,079 $ 53,670
Additions        
Originated and purchased servicing 1,563 3,015 7,265 8,984
Acquisition of RICHMAC   3,970   3,970
Subtractions        
Sales (658) (1,083) (3,267) (3,813)
Changes in fair value due to changes in valuation inputs or assumptions used in the valuation model 500 (1,437) 1,413 (789)
Balance, end of period 71,490 $ 62,022 71,490 $ 62,022
Derivative assets | Interest Rate Lock Commitments        
Reconciliation of significant unobservable inputs, assets:        
Balance, beginning of period 170      
Subtractions        
Changes in fair value (102)   68  
Balance, end of period 68   68  
Municipals | Available-for-sale Securities        
Reconciliation of significant unobservable inputs, assets:        
Balance, beginning of period 6,431   6,688  
Subtractions        
Paydown     (257)  
Sales $ (6,431)   $ (6,431)