Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities
Net income	$ 15,833	$ 16,914	$ 17,790
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,009	1,641	1,531
Deferred income tax expense	10	73	64
Depreciation of premises and equipment	749	732	726
Amortization of intangibles	999	1,075	1,078
Amortization of premiums and accretion of discounts, net	117	138	171
(Gains) losses on disposal of fixed assets	15	94	(11)
(Gains) losses on calls of securities available for sale, net	(33)	(2)	52
Gains on calls of securities held to maturity, net	0	0	(6)
Losses and writedowns on other real estate owned	426	129	99
Income on investment in BOLI	(603)	(616)	(658)
Gains on sale of mortgage loans held for sale	(273)	(159)	(335)
Originations of mortgage loans held for sale	(17,641)	(9,104)	(16,737)
Sale of mortgage loans held for sale	17,571	10,248	18,592
Net change in:
Accrued interest receivable	(21)	201	298
Other assets	420	(574)	1,760
Accrued interest payable	(12)	(24)	(47)
Other liabilities	963	(428)	83
Net cash provided by operating activities	20,529	20,338	24,450
Cash Flows from Investing Activities
Net change in interest-bearing deposits	(28,263)	(4,482)	(781)
Proceeds from repayments of mortgage-backed securities	717	902	1,745
Proceeds from calls and maturities of securities available for sale	64,556	11,088	63,886
Proceeds from calls and maturities of securities held to maturity	9,205	8,677	9,738
Purchases of securities available for sale	(80,093)	(33,905)	(83,996)
Purchases of securities held to maturity	0	(6,381)	(13,484)
Net change in restricted stock	(40)	325	275
Purchases of loan participations	(1,001)	(200)	(900)
Collections of loan participations	1,978	1,539	152
Loan originations and principal collections, net	(17,259)	(13,880)	(8,830)
Proceeds from disposal of other real estate owned	773	744	854
Recoveries on loans charged off	145	255	167
Additions to premises and equipment	(663)	(459)	(276)
Proceeds from sale of premises and equipment	0	453	11
Net cash used in investing activities	(49,945)	(35,324)	(31,439)
Cash Flows from Financing Activities
Net change in time deposits	(24,363)	(24,963)	(36,029)
Net change in other deposits	60,794	47,355	49,299
Cash dividends paid	(7,930)	(7,853)	(7,781)
Stock options exercised	173	58	0
Net cash provided by financing activities	28,674	14,597	5,489
Net change in cash and due from banks	(742)	(389)	(1,500)
Cash and due from banks at beginning of year	12,894	13,283	14,783
Cash and due from banks at end of year	12,152	12,894	13,283
Supplemental Disclosures of Cash Flow Information
Interest paid on deposits and borrowed funds	4,195	4,923	6,002
Income taxes paid	4,790	5,282	5,145
Supplemental Disclosures of Noncash Activities
Loans charged against the allowance for loan losses	2,120	1,860	1,820
Loans transferred to other real estate owned	620	905	4,230
Unrealized gains (losses) on securities available for sale	(1,668)	19,121	(24,704)
Minimum pension liability adjustment	$ (1,815)	$ 1,750	$ 2,819