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Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Liability for repurchases $ 390 $ 420  
Future minimum rental commitments for all noncancellable operating leases      
2018 3,300    
2019 3,070    
2020 2,740    
2021 1,600    
2022 430    
Thereafter 1,860    
Rental expense of office premises and equipment and rental income from owned premises      
Gross rental expense 4,183 3,995 $ 3,889
Gross rental income (856) (921) (914)
Net rental expense $ 3,327 $ 3,074 $ 2,975