Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities:
Net Income	$ 36,279	$ 29,326	$ 26,534
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Loan Losses	2,607	2,736	2,033
Depreciation and Amortization	4,751	5,398	5,940
Allocation of ESOP Stock	174	353	1,122
Gains on the Sale of Securities Available-for-Sale	0	(134)	(317)
Losses on the Sale of Securities Available-for-Sale	0	582	339
Net Gain on Equity Securities	(213)	0	0
Loans Originated and Held-for-Sale	(4,179)	(17,468)	(23,787)
Proceeds from the Sale of Loans Held-for-Sale	4,426	18,171	24,422
Net Gains on the Sale of Loans	(135)	(546)	(821)
Net Losses on the Sale or Write-down of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	159	210	232
Contributions to Pension & Postretirement Plans	(744)	(792)	(690)
Deferred Income Tax Benefit	(92)	(1,530)	(283)
Shares Issued Under the Directors’ Stock Plan	205	233	205
Stock-Based Compensation Expense	356	351	287
Tax Benefit from Exercise of Stock Options	240	112	0
Net (Increase) in Other Assets	(1,182)	(157)	(1,598)
Net Increase (Decrease) in Other Liabilities	(676)	982	1,077
Net Cash Provided By Operating Activities	41,976	37,827	34,695
Cash Flows from Investing Activities:
Proceeds from the Sale of Securities Available-for-Sale	0	107,175	97,930
Proceeds from the Maturities and Calls of Securities Available-for-Sale	61,807	53,863	88,719
Purchases of Securities Available-for-Sale	(84,746)	(117,262)	(134,950)
Proceeds from the Maturities and Calls of Securities Held-to-Maturity	58,978	49,244	56,461
Purchases of Securities Held-to-Maturity	(7,506)	(40,851)	(82,433)
Net Increase in Loans	(247,569)	(200,600)	(182,065)
Proceeds from the Sales of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	1,828	1,408	1,991
Purchase of Premises and Equipment	(5,103)	(2,602)	(1,441)
Proceeds from the Sale of a Subsidiary, Net	98	96	72
Net (Increase) Decrease in Federal Home Loan Bank Stock	(5,557)	963	(2,073)
Net Cash Used In Investing Activities	(227,770)	(148,566)	(157,789)
Cash Flows from Financing Activities:
Net Increase in Deposits	100,468	128,569	86,123
Net Increase (Decrease) in Short-Term Federal Home Loan Bank Borrowings	129,000	(18,000)	41,000
Net Increase (Decrease) in Short-Term Borrowings	(10,307)	29,130	12,663
Repayments of Federal Home Loan Bank Advances	(10,000)	0	0
Purchase of Treasury Stock	(2,098)	(3,248)	(2,141)
Shares Issued for Stock Option Exercises, net	2,255	1,190	2,404
Shares Issued Under the Employee Stock Purchase Plan	505	496	493
Tax Benefit for Exercises of Stock Options	0	0	188
Shares Issued for Dividend Reinvestment Plans	1,761	1,684	1,743
Cash Dividends Paid	(14,389)	(13,599)	(13,092)
Net Cash Provided By Financing Activities	197,195	126,222	129,381
Net Increase in Cash and Cash Equivalents	11,401	15,483	6,287
Cash and Cash Equivalents at Beginning of Year	72,838	57,355	51,068
Cash and Cash Equivalents at End of Year	84,239	72,838	57,355
Supplemental Disclosures to Statements of Cash Flow Information:
Interest on Deposits and Borrowings	12,212	6,957	5,341
Income Taxes	10,037	11,454	11,961
Non-cash Investing and Financing Activity:
Transfer of Loans to Other Real Estate Owned and Repossessed Assets	$ 1,015	$ 1,779	$ 1,876