Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net income	$ 17,466	$ 16,151	$ 14,092
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	126	(81)	157
Deferred income tax expense (benefit)	529	(382)	1,790
Re-valuation of deferred tax assets			1,560
Depreciation of premises and equipment	739	766	805
Amortization of intangibles		50	68
Amortization of premiums and accretion of discounts, net	212	58	58
Loss (gain) on disposal of fixed assets	5		(134)
Gain on calls and sales of securities available for sale, net	(566)	(17)	(10)
Gain on calls of securities held to maturity, net			(4)
Loss and write-down on other real estate owned	5	489	125
Loss (gain) on sale of repossessed assets	4	8	(1)
Income on investment in BOLI	(910)	(901)	(758)
Gain on sale of mortgage loans held for sale	(297)	(199)	(211)
Origination of mortgage loans held for sale	(21,032)	(12,626)	(13,912)
Sale of mortgage loans held for sale	20,496	13,013	14,341
Contribution to defined benefit plan			(4,507)
Net change in:
Accrued interest receivable	875	137	(37)
Other assets	(1,340)	2,899	(2,537)
Accrued interest payable	55	27	7
Other liabilities	2,465	404	101
Net cash provided by operating activities	18,832	19,796	10,993
Cash Flows from Investing Activities
Net change in interest-bearing deposits	(33,390)	7,742	29,035
Proceeds from repayments of mortgage-backed securities	1,089	224	298
Proceeds from calls, sales and maturities of securities available for sale	348,032	50,438	13,812
Proceeds from calls and maturities of securities held to maturity		6,430	8,975
Purchases of securities available for sale	(352,505)	(25,323)	(40,290)
Purchases of securities held to maturity			(1,319)
Net change in restricted stock		(20)	(30)
Purchase of BOLI			(10,000)
Purchases of loan participations	(673)	(7,853)	(7,395)
Collections of loan participations	4,262	970	2,113
Loan originations and principal collections, net	(28,388)	(35,591)	(15,981)
Proceeds from disposal of other real estate owned	591	276	311
Proceeds from disposal of repossessed assets	53	34	31
Recoveries on loans charged off	267	235	287
Additions to premises and equipment	(1,032)	(1,191)	(261)
Proceeds from sale of premises and equipment	16		222
Net cash used in investing activities	(61,678)	(3,629)	(20,192)
Cash Flows from Financing Activities
Net change in time deposits	26,229	(13,085)	(15,730)
Net change in other deposits	41,582	5,293	32,022
Cash dividends paid	(9,032)	(8,419)	(8,141)
Shares repurchased	(18,525)
Net cash provided by (used in) financing activities	40,254	(16,211)	8,151
Net change in cash and due from banks	(2,592)	(44)	(1,048)
Cash and due from banks at beginning of year	12,882	12,926	13,974
Cash and due from banks at end of year	10,290	12,882	12,926
Supplemental Disclosures of Cash Flow Information
Interest paid on deposits and borrowed funds	7,325	5,020	4,118
Income taxes paid	2,544	1,778	4,092
Supplemental Disclosures of Noncash Activities
Loans charged against the allowance for loan losses	920	689	819
Loans transferred to other real estate owned	156		97
Unrealized gain (loss) on securities available for sale	6,515	(2,858)	832
Unrealized net gain on securities transferred from HTM to AFS		1,128
Fair value of securities transferred from held-to-maturity to available-for-sale		119,790
Minimum pension liability adjustment	(1,986)	(1,295)	219
Accounting Standards Update 2016-02 [Member]
Supplemental Disclosures of Noncash Activities
Increase in the lease right-of-use asset upon adoption of ASU 2016-02	684
Increase in the lease liability upon adoption of ASU 2016-02	$ 684