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	$ 37,475	$ 36,279	$ 29,326
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Loan Losses	2,079	2,607	2,736
Depreciation and Amortization	5,503	4,751	5,398
Allocation of ESOP Stock	180	174	353
Gains on the Sale of Securities Available-for-Sale	0	0	(134)
Losses on the Sale of Securities Available-for-Sale	0	0	582
Net Gain on Equity Securities	(289)	(213)	0
Loans Originated and Held-for-Sale	(23,850)	(4,179)	(17,468)
Proceeds from the Sale of Loans Held-for-Sale	24,538	4,426	18,171
Net Gains on the Sale of Loans	(622)	(135)	(546)
Net Losses on the Sale or Write-down of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	882	159	210
Contributions to Pension & Postretirement Plans	(675)	(744)	(792)
Deferred Income Tax Benefit (Expense)	344	(92)	(1,530)
Shares Issued Under the Directors’ Stock Plan	258	205	233
Stock-Based Compensation Expense	391	356	351
Tax Benefit from Exercise of Stock Options	227	240	112
Net Increase in Other Assets	(12,527)	(1,182)	(157)
Net Increase (Decrease) in Other Liabilities	10,030	(676)	982
Net Cash Provided By Operating Activities	43,944	41,976	37,827
Cash Flows from Investing Activities:
Proceeds from the Sale of Securities Available-for-Sale	0	0	107,175
Proceeds from the Maturities and Calls of Securities Available-for-Sale	96,058	61,807	53,863
Purchases of Securities Available-for-Sale	(131,348)	(84,746)	(117,262)
Proceeds from the Maturities and Calls of Securities Held-to-Maturity	41,607	58,978	49,244
Purchases of Securities Held-to-Maturity	(4,003)	(7,506)	(40,851)
Net Increase in Loans	(193,460)	(247,569)	(200,600)
Proceeds from the Sales of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	1,511	1,828	1,408
Purchase of Premises and Equipment	(7,785)	(5,103)	(2,602)
Proceeds from the Sale of a Subsidiary, Net	0	98	96
Net Decrease (Increase) in Federal Home Loan Bank Stock	5,189	(5,557)	963
Net Cash Used In Investing Activities	(192,231)	(227,770)	(148,566)
Cash Flows from Financing Activities:
Net Increase in Deposits	270,470	100,468	128,569
Net (Decrease) Increase in Short-Term Federal Home Loan Bank Borrowings	(104,000)	129,000	(18,000)
Net (Decrease) Increase in Short-Term Borrowings	(3,560)	(10,307)	29,130
Finance Lease Payments	(28)
Repayments of Federal Home Loan Bank Advances	(15,000)	(10,000)	0
Purchase of Treasury Stock	(2,469)	(2,098)	(3,248)
Shares Issued for Stock Option Exercises, net	1,792	2,255	1,190
Shares Issued Under the Employee Stock Purchase Plan	493	505	496
Shares Issued for Dividend Reinvestment Plans	1,777	1,761	1,684
Cash Dividends Paid	(15,206)	(14,389)	(13,599)
Net Cash Provided By Financing Activities	134,269	197,195	126,222
Net (Decrease) Increase in Cash and Cash Equivalents	(14,018)	11,401	15,483
Cash and Cash Equivalents at Beginning of Year	84,239	72,838	57,355
Cash and Cash Equivalents at End of Year	70,221	84,239	72,838
Supplemental Disclosures to Statements of Cash Flow Information:
Interest on Deposits and Borrowings	20,843	12,212	6,957
Income Taxes	9,931	10,037	11,454
Non-cash Investing and Financing Activity:
Transfer of Loans to Other Real Estate Owned and Repossessed Assets	$ 1,810	$ 1,015	$ 1,779