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Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Liability for repurchases $ 420 $ 980  
Future minimum rental commitments for all noncancellable operating leases      
2017 3,520    
2018 3,110    
2019 2,880    
2020 2,580    
2021 1,560    
Thereafter 1,280    
Future minimum rentals to be received under noncancellable subleases 1,660    
Rental expense of office premises and equipment and related sublease income      
Gross rental expense 3,995 3,889 $ 3,799
Sublease rental income (921) (914) (878)
Net rental expense $ 3,074 $ 2,975 $ 2,921