Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net income	$ 16,151,000	$ 14,092,000	$ 14,942,000
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	(81,000)	157,000	1,650,000
Deferred income tax expense (benefit)	(382,000)	1,790,000	18,000
Re-valuation of deferred tax assets		1,560,000
Depreciation of premises and equipment	766,000	805,000	801,000
Amortization of intangibles	50,000	68,000	257,000
Amortization of premiums and accretion of discounts, net	58,000	58,000	89,000
Gain on disposal of fixed assets		(134,000)
Gain on calls and sales of securities available for sale, net	(17,000)	(10,000)	(186,000)
Gain on calls of securities held to maturity, net		(4,000)	(46,000)
Loss and write-down on other real estate owned	489,000	125,000	355,000
Income on investment in BOLI	(901,000)	(758,000)	(597,000)
Gain on sale of mortgage loans held for sale	(199,000)	(211,000)	(280,000)
Origination of mortgage loans held for sale	(12,626,000)	(13,912,000)	(17,090,000)
Sale of mortgage loans held for sale	13,013,000	14,341,000	17,526,000
Contribution to defined benefit plan		(4,507,000)	(811,000)
Net change in:
Accrued interest receivable	137,000	(37,000)	509,000
Other assets	2,886,000	(2,537,000)	438,000
Accrued interest payable	27,000	7,000	(1,000)
Other liabilities	404,000	101,000	(41,000)
Net cash provided by operating activities	19,775,000	10,994,000	17,533,000
Cash Flows from Investing Activities
Net change in interest-bearing deposits	7,742,000	29,035,000	50,543,000
Proceeds from repayments of mortgage-backed securities	224,000	298,000	415,000
Proceeds from calls, sales and maturities of securities available for sale	50,438,000	13,812,000	220,581,000
Proceeds from calls and maturities of securities held to maturity	6,430,000	8,975,000	16,945,000
Purchases of securities available for sale	(25,323,000)	(40,290,000)	(290,296,000)
Purchases of securities held to maturity		(1,319,000)
Net change in restricted stock	(20,000)	(30,000)	(41,000)
Purchase of BOLI		(10,000,000)
Purchases of loan participations	(7,853,000)	(7,395,000)	(3,800,000)
Collections of loan participations	970,000	2,113,000	820,000
Loan originations and principal collections, net	(35,536,000)	(15,951,000)	(27,792,000)
Proceeds from disposal of other real estate owned	276,000	311,000	877,000
Recoveries on loans charged off	235,000	287,000	159,000
Additions to premises and equipment	(1,191,000)	(261,000)	(634,000)
Proceeds from sale of premises and equipment		222,000
Net cash used in investing activities	(3,608,000)	(20,193,000)	(32,223,000)
Cash Flows from Financing Activities
Net change in time deposits	(13,085,000)	(15,730,000)	(21,147,000)
Net change in other deposits	5,293,000	32,022,000	45,730,000
Cash dividends paid	(8,419,000)	(8,141,000)	(8,071,000)
Net cash provided by (used in) financing activities	(16,211,000)	8,151,000	16,512,000
Net change in cash and due from banks	(44,000)	(1,048,000)	1,822,000
Cash and due from banks at beginning of year	12,926,000	13,974,000	12,152,000
Cash and due from banks at end of year	12,882,000	12,926,000	13,974,000
Supplemental Disclosures of Cash Flow Information
Interest paid on deposits and borrowed funds	5,020,000	4,118,000	4,167,000
Income taxes paid	1,778,000	4,092,000	3,940,000
Supplemental Disclosures of Noncash Activities
Loans charged against the allowance for loan losses	689,000	819,000	1,806,000
Loans transferred to other real estate owned		97,000	222,000
Unrealized gain (loss) on securities available for sale	(2,858,000)	832,000	(1,417,000)
Unrealized net gain on securities transferred from HTM to AFS	1,128,000
Fair value of securities transferred from held-to-maturity to available-for-sale	119,790,000
Minimum pension liability adjustment	$ (1,295,000)	$ 219,000	$ 293,000