Mortgage Servicing Assets (Tables)

12 Months Ended

Dec. 31, 2016

Mortgage Banking [Abstract]

Summary of Mortgage Servicing Rights

A summary of mortgage servicing rights follows:

	2016			2015			2014
	(dollars in thousands)
Beginning of year mortgage servicing rights:	$	2,040		$	2,072		$	2,356
Amounts capitalized		983			657			386
Amortization		(752	)		(689	)		(709	)
Impairment		—			—			39
End of year	$	2,271		$	2,040		$	2,072

Estimated Amortization Expense

Amortization expense is estimated as follows:

Year ending December 31,
(dollars in thousands)
2017	$	536
2018		465
2019		393
2020		320
2021		248
Thereafter		309
Total	$	2,271

Key Assumptions Used to Value Mortgage Servicing Rights

The key assumptions used to value mortgage servicing rights were as follows:

	2016			2015
Weighted average remaining life	262 months			257 months
Weighted average discount rate		14	%		10	%
Weighted average coupon		3.89	%		3.95	%
Weighted average prepayment speed		145	%		171	%