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Benefit Plans - Other Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred compensation plan | Executive Officer      
Benefit Plans      
Amounts expensed $ 721 $ 573 $ 555
Amounts recorded as liability 8,400 5,700 5,400
SERP      
Benefit Plans      
Expense incurred for SERP 721 573 $ 307
Deferred compensation liability 8,300 $ 5,100  
SERP | Plaza Bancorp      
Benefit Plans      
Deferred compensation liability $ 2,000