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Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Liability for repurchases $ 980 $ 1,720  
Future minimum rental commitments for all noncancellable operating leases      
2016 3,490    
2017 3,070    
2018 2,660    
2019 2,450    
2020 2,220    
Thereafter 2,110    
Future minimum rentals to be received under noncancellable subleases 1,920    
Rental expense of office premises and equipment and related sublease income      
Gross rental expense 3,889 3,799 $ 3,875
Sublease rental income (914) (878) (910)
Net rental expense $ 2,975 $ 2,921 $ 2,965