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Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of rental expense of office premises and equipment and related sublease income
The following table shows rental expense of office premises and equipment and related sublease income.
Year Ended December 31 (Dollars in thousands) 
 
2016
 
2015
 
2014
Gross rental expense
 
$
3,995

 
$
3,889

 
$
3,799

Sublease rental income
 
(921
)
 
(914
)
 
(878
)
Net rental expense
 
$
3,074

 
$
2,975

 
$
2,921
Schedule of financial instruments whose contract amounts represent credit risk
Financial instruments, whose contract amounts represent credit risk as of December 31, were as follows:
(Dollars in thousands)
 
2016
 
2015
Amounts of commitments:
 
 
 
 
Loan commitments to extend credit
 
$
868,267

 
$
829,509

Standby letters of credit
 
$
33,397

 
$
37,984

Commercial and similar letters of credit
 
$
1,704

 
$
741