Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net income	$ 14,942	$ 15,833	$ 16,914
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,650	2,009	1,641
Deferred income tax expense	18	10	73
Depreciation of premises and equipment	801	749	732
Amortization of intangibles	257	999	1,075
Amortization of premiums and accretion of discounts, net	89	117	138
Loss on disposal of fixed assets		15	94
Gain on calls of securities available for sale, net	(186)	(33)	(2)
Gain on calls of securities held to maturity, net	(46)
Loss and writedown on other real estate owned	355	426	129
Income on investment in BOLI	(597)	(603)	(616)
Gain on sale of mortgage loans held for sale	(280)	(273)	(159)
Origination of mortgage loans held for sale	(17,090)	(17,641)	(9,104)
Sale of mortgage loans held for sale	17,526	17,571	10,248
Net change in:
Accrued interest receivable	509	(21)	201
Other assets	(373)	420	(574)
Accrued interest payable	(1)	(12)	(24)
Other liabilities	(41)	963	(428)
Net cash provided by operating activities	17,533	20,529	20,338
Cash Flows from Investing Activities
Net change in interest-bearing deposits	50,543	(28,263)	(4,482)
Proceeds from repayments of mortgage-backed securities	415	717	902
Proceeds from calls and maturities of securities available for sale	220,581	64,556	11,088
Proceeds from calls and maturities of securities held to maturity	16,945	9,205	8,677
Purchases of securities available for sale	(290,296)	(80,093)	(33,905)
Purchases of securities held to maturity			(6,381)
Net change in restricted stock	(41)	(40)	325
Purchases of loan participations	(3,800)	(1,001)	(200)
Collections of loan participations	820	1,978	1,539
Loan originations and principal collections, net	(27,792)	(17,259)	(13,880)
Proceeds from disposal of other real estate owned	877	773	744
Recoveries on loans charged off	159	145	255
Additions to premises and equipment	(634)	(663)	(459)
Proceeds from sale of premises and equipment			453
Net cash used in investing activities	(32,223)	(49,945)	(35,324)
Cash Flows from Financing Activities
Net change in time deposits	(22,942)	(24,363)	(24,963)
Net change in other deposits	47,525	60,794	47,355
Cash dividends paid	(8,071)	(7,930)	(7,853)
Stock options exercised		173	58
Net cash provided by financing activities	16,512	28,674	14,597
Net change in cash and due from banks	1,822	(742)	(389)
Cash and due from banks at beginning of year	12,152	12,894	13,283
Cash and due from banks at end of year	13,974	12,152	12,894
Supplemental Disclosures of Cash Flow Information
Interest paid on deposits and borrowed funds	4,167	4,195	4,923
Income taxes paid	3,940	4,790	5,282
Supplemental Disclosures of Noncash Activities
Loans charged against the allowance for loan losses	1,806	2,120	1,860
Loans transferred to other real estate owned	222	620	905
Unrealized gain (loss) on securities available for sale	(1,417)	(1,668)	19,121
Minimum pension liability adjustment	$ 293	$ (1,815)	$ 1,750