Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income	$ 8,289,000	$ 8,924,000	$ 8,233,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	821,000	891,000	1,024,000
Provision for loan losses	1,400,000	30,000	200,000
Net gain on investment securities available-for-sale	(1,500,000)	(674,000)	(783,000)
Net (gain) loss on sale of other real estate owned, repossessed assets and premises and equipment	(1,000)	(2,000)	17,000
Net gain on sale of loans	(276,000)	(320,000)	(356,000)
Loss on sale of indirect lease financing portfolio		223,000
Gain on sale of loan held for investment	(99,000)
Proceeds from sales of residential mortgages held-for-sale	9,041,000	9,204,000	10,903,000
Origination of residential mortgages held-for-sale	(7,976,000)	(8,686,000)	(11,154,000)
Income on bank-owned life insurance	(345,000)	(308,000)	(307,000)
Stock-based compensation expense	102,000	88,000	85,000
Net decrease in trading securities	3,596,000	593,000	18,000
Deferred income tax (benefit) provision	2,322,000	(145,000)
Net increase (decrease) in income taxes payable	(154,000)	48,000	77,000
Net (increase) decrease in accrued interest receivable	(417,000)	(566,000)	6,000
Amortization of mortgage servicing rights and change in valuation allowance	82,000	75,000	80,000
Net amortization of premiums and discounts on investment securities	1,694,000	1,846,000	2,094,000
Net increase (decrease) in accrued interest payable	49,000	5,000	(14,000)
Increase in other assets	(887,000)	(363,000)	(71,000)
Increase (decrease) in other liabilities	421,000	469,000	(936,000)
Net cash provided by operating activities	16,162,000	11,332,000	9,116,000
Investing Activities
Proceeds from payments, maturities and calls of investment securities available-for-sale	52,994,000	107,278,000	94,372,000
Proceeds from maturities of investment securities held-to-maturity		147,000
Proceeds from the sale of investment securities available-for-sale	42,509,000	32,573,000	47,960,000
Purchases of investment securities available-for-sale	(85,265,000)	(174,943,000)	(132,048,000)
Proceeds from redemption of investment in restricted bank stock	6,318,000	1,482,000	1,319,000
Purchase of restricted bank stock	(6,802,000)	(1,991,000)	(1,180,000)
Net increase in loans	(101,157,000)	(26,567,000)	(60,850,000)
Proceeds from sale of indirect lease financing portfolio held for investment		8,345,000
Net purchases of premises and equipment	(634,000)	(317,000)	(580,000)
Proceeds from sale of loans held for investment	99,000
Redemption of bank-owned life insurance	754,000
Proceeds from sales of other real estate owned and repossessed assets	2,000	2,000	3,245,000
Net cash used in investing activities	(91,182,000)	(53,991,000)	(47,762,000)
Financing Activities
Net increase in non-interest bearing deposits	10,202,000	20,467,000	11,623,000
Net increase in interest-bearing deposits	70,391,000	3,102,000	26,571,000
Net increase in short-term borrowings	3,096,000	15,497,000	1,974,000
Tax benefit from exercise of stock options		17,000	21,000
Cash dividends paid, net of reinvestment	(3,731,000)	(3,556,000)	(3,445,000)
Proceeds from issuance of common stock	672,000	862,000	648,000
Net cash provided by (used in) financing activities	80,630,000	36,389,000	37,392,000
Increase (decrease) in cash and cash equivalents	5,610,000	(6,270,000)	(1,254,000)
Cash and cash equivalents at beginning of year	10,721,000	16,991,000	18,245,000
Cash and cash equivalents at end of period	16,331,000	10,721,000	16,991,000
Supplemental Cash Flow Disclosures
Interest paid	5,631,000	4,728,000	4,520,000
Income taxes paid	$ 3,731,000	$ 3,132,000	2,479,000
Non-cash transactions:
Transfer of loans to repossessed assets or other real estate owned			215,000
Unsettled trades to purchase securities			$ 494,000