Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015			2014			2013
Gross rental expense	$	3,889		$	3,799		$	3,875
Sublease rental income	(914		)	(878		)	(910		)
Net rental expense	$	2,975		$	2,921		$	2,965

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)	2015		2014
Amounts of commitments:
Loan commitments to extend credit	$	829,509	$	733,870
Standby letters of credit	$	37,984	$	26,939