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Derivative Instruments and Balance Sheet Offsetting - Net Gains (Losses) Related to Changes in Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative instruments    
Total gain (loss) recognized in income $ 509 $ 15
Forward contracts related to mortgage loans to be delivered for sale | Net gain (loss) on sale of loans and other mortgage banking revenue    
Derivative instruments    
Total gain (loss) recognized in income (370) (977)
Interest rate lock commitments | Net gain (loss) on sale of loans and other mortgage banking revenue    
Derivative instruments    
Total gain (loss) recognized in income 552 1,223
Customer-initiated derivatives | Other noninterest income    
Derivative instruments    
Total gain (loss) recognized in income $ 327 $ (231)