Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net Income	$ 26,534	$ 24,662	$ 23,360
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Loan Losses	2,033	1,347	1,848
Depreciation and Amortization	5,940	6,293	7,042
Allocation of ESOP Stock	1,122	495	452
Gains on the Sale of Securities Available-for-Sale	(317)	(172)	(137)
Losses on the Sale of Securities Available-for-Sale	339	43	27
Loans Originated and Held-for-Sale	(23,787)	(20,731)	(23,156)
Proceeds from the Sale of Loans Held-for-Sale	24,422	21,524	23,606
Net Gains on the Sale of Loans	(821)	(692)	(784)
Net Losses on the Sale or Write-down of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	232	297	77
Net Gain on the Sale of a Subsidiary	0	(204)	0
Contributions to Pension & Postretirement Plans	(690)	(3,858)	(921)
Deferred Income Tax (Benefit) Expense	(283)	1,036	(299)
Shares Issued Under the Directors’ Stock Plan	205	227	197
Stock-Based Compensation Expense	287	308	360
Net (Increase) in Other Assets	(1,598)	(1,147)	(806)
Net Increase (Decrease) in Other Liabilities	1,077	(502)	(225)
Net Cash Provided By Operating Activities	34,695	28,926	30,641
Cash Flows from Investing Activities:
Proceeds from the Sale of Securities Available-for-Sale	97,930	66,551	49,928
Proceeds from the Maturities and Calls of Securities Available-for-Sale	88,719	93,817	153,127
Purchases of Securities Available-for-Sale	(134,950)	(201,820)	(113,953)
Proceeds from the Maturities and Calls of Securities Held-to-Maturity	56,461	48,409	56,714
Purchases of Securities Held-to-Maturity	(82,433)	(68,210)	(60,906)
Net Increase in Loans	(182,065)	(164,710)	(148,482)
Proceeds from the Sales or Write-down of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	1,991	1,901	1,237
Purchase of Premises and Equipment	(1,441)	(1,621)	(1,468)
Cash Paid for Subsidiaries, Net	0	0	(75)
Proceeds from the Sale of a Subsidiary, Net	72	132	0
Net (Increase) Decrease in Federal Home Loan Bank Stock	(2,073)	(3,988)	1,430
Purchase of Bank Owned Life Insurance	0	0	(5,245)
Net Cash Used In Investing Activities	(157,789)	(229,539)	(67,693)
Cash Flows from Financing Activities:
Net Increase in Deposits	86,123	127,475	60,618
Net Increase (Decrease) in Short-Term Federal Home Loan Bank Borrowings	41,000	41,000	(12,000)
Net Increase in Short-Term Borrowings	12,663	3,752	7,644
Federal Home Loan Bank Advances	0	55,000	0
Repayments of Federal Home Loan Bank Advances	0	(10,000)	(10,000)
Purchase of Treasury Stock	(2,141)	(1,498)	(2,455)
Shares Issued for Stock Option Exercises, net	2,404	918	1,454
Shares Issued Under the Employee Stock Purchase Plan	493	494	488
Tax Benefit for Exercises of Stock Options	188	59	25
Shares Issued for Dividend Reinvestment Plans	1,743	886	0
Cash Dividends Paid	(13,092)	(12,700)	(12,407)
Net Cash Provided By Financing Activities	129,381	205,386	33,367
Net Increase (Decrease) in Cash and Cash Equivalents	6,287	4,773	(3,685)
Cash and Cash Equivalents at Beginning of Year	51,068	46,295	49,980
Cash and Cash Equivalents at End of Year	57,355	51,068	46,295
Supplemental Disclosures to Statements of Cash Flow Information:
Interest on Deposits and Borrowings	5,341	4,856	5,932
Income Taxes	11,961	9,357	10,060
Non-cash Investing and Financing Activity:
Transfer of Loans to Other Real Estate Owned and Repossessed Assets	1,876	3,046	1,308
Shares Issued for Acquisition of Subsidiary	$ 0	$ 0	$ 91