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Fair Value (Changes Level 3 assets (fair value, recurring)) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Gains included in net gains on sale of loans held for sale $ 8,178 $ 8,691  
Interest rate lock commitments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 1,738 $ 2,790 $ 2,790
Acquired interest rate lock commitments 1,383   0
Total gains (losses) included in earnings 769   (1,479)
Issuances 1,970   1,875
Settlements (2,465)   (1,448)
Balance at period end 3,395   1,738
Gains included in net gains on sale of loans held for sale $ 3,400   $ 1,700