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Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of rental expense of office premises and equipment and rental income from owned premises
The following table shows rental expense of office premises and equipment and rental income from owned premises.
Year Ended December 31 (Dollars in thousands) 
 
2017
 
2016
 
2015
Gross rental expense
 
$
4,183

 
$
3,995

 
$
3,889

Gross rental income
 
(856
)
 
(921
)
 
(914
)
Net rental expense
 
$
3,327

 
$
3,074

 
$
2,975
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)
 
2017
 
2016
Amounts of commitments:
 
 
 
 
Loan commitments to extend credit
 
$
1,030,334

 
$
868,267

Standby letters of credit
 
$
29,961

 
$
33,397

Commercial and similar letters of credit
 
$
1,837

 
$
1,704