Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 40,676	$ 35,184	$ 30,064
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:
Net Amortization on Securities	3,543	3,675	2,548
Depreciation and Amortization	4,687	4,315	4,264
Loans Originated for Sale	(122,518)	(138,192)	(137,687)
Proceeds from Sales of Loans Held-for-Sale	134,316	137,307	136,088
Provision for Loan Losses	1,750	1,200	0
Gain on Sale of Loans, net	(3,280)	(3,359)	(2,959)
Gain on Securities, net	(596)	(1,979)	(725)
Loss (Gain) on Sales of Other Real Estate and Repossessed Assets	(17)	(55)	63
Loss on Disposition and Donation of Premises and Equipment	870	5	389
Post Retirement Medical Benefit	(34)	7	15
Increase in Cash Surrender Value of Company Owned Life Insurance	(1,370)	(1,068)	(689)
Equity Based Compensation	1,246	1,407	963
Excess Tax Benefit from Restricted Share Grant	240	200	89
Change in Assets and Liabilities:
Interest Receivable and Other Assets	(4,528)	5,813	172
Interest Payable and Other Liabilities	(110)	(2,547)	(1,328)
Net Cash from Operating Activities	54,875	41,913	31,267
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of Other Short-term Investments	0	(1,000)	0
Proceeds from Maturity of Other Short-term Investments	0	1,992	100
Proceeds from Maturities, Calls, Redemptions of Securities Available-for-Sale	79,955	103,301	90,702
Proceeds from Sales of Securities Available-for-Sale	49,459	165,102	18,999
Purchase of Securities Available-for-Sale	(156,802)	(225,456)	(116,942)
Proceeds from Maturities of Securities Held-to-Maturity	0	95	89
Purchase of Federal Home Loan Bank Stock	0	(1,350)	(2,395)
Proceeds from Redemption of Federal Home Loan Bank Stock	0	0	864
Purchase of Loans	(5,547)	(5,383)	(9,895)
Proceeds from Sales of Loans	1,106	2,029	0
Loans Made to Customers, net of Payments Received	(149,336)	(106,198)	(108,007)
Proceeds from Sales of Other Real Estate	1,435	1,429	1,170
Property and Equipment Expenditures	(11,183)	(5,234)	(1,614)
Proceeds from Sales of Property and Equipment	6	0	0
Proceeds from Life Insurance	1,627	0	0
Acquisition of River Valley Bancorp	0	(1,016)	0
Net Cash from Investing Activities	(189,280)	(71,689)	(126,929)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	134,737	118,231	46,630
Change in Short-term Borrowings	(4,054)	(40,163)	36,244
Advances in Long-term Debt	75,000		75,000
Repayments of Long-term Debt	(53,864)	(24,910)	(44,135)
Issuance (Retirement) of Common Stock	(29)	55	49
Employee Stock Purchase Plan			447
Dividends Paid	(11,842)	(10,630)	(9,010)
Net Cash from Financing Activities	139,948	42,583	105,225
Net Change in Cash and Cash Equivalents	5,543	12,807	9,563
Cash and Cash Equivalents at Beginning of Year	64,816	52,009	42,446
Cash and Cash Equivalents at End of Year	70,359	64,816	52,009
Cash Paid During the Year for
Interest	10,852	8,348	6,146
Income Taxes	12,462	9,254	9,083
Supplemental Non Cash Disclosures (See Note 18 for Business Combinations)
Loans Transferred to Other Real Estate	1,230	565	1,046
Reclassification of Land to Other Assets	$ 330	$ 664	$ 0