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Disclosures about Fair Value of Assets and Liabilities - Reconciliation of Unobservable Inputs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mortgage servicing rights.      
Reconciliation of significant unobservable inputs, assets:      
Balance, beginning of period $ 77,844 $ 66,079 $ 53,670
Additions      
Originated and purchased servicing 7,332 14,113 10,993
Acquisition of MCS     3,970
Subtractions      
Paydowns (5,994) (4,196) (5,504)
Changes in fair value due to changes in valuation inputs or assumptions used in the valuation model (4,795) 1,848 2,950
Balance, end of period 74,387 77,844 66,079
Available-for-sale Securities. | Municipals      
Reconciliation of significant unobservable inputs, assets:      
Balance, beginning of period 6,688 6,688  
Additions      
Purchased securities     6,688
Subtractions      
Paydowns   (257)  
Sales   (6,431)  
Balance, end of period   6,688 $ 6,688
Derivative assets | Interest Rate Lock Commitments      
Reconciliation of significant unobservable inputs, assets:      
Balance, beginning of period 70    
Subtractions      
Changes in fair value 116 70  
Balance, end of period $ 186 $ 70