Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net Income Available to Common Shareholders	$ 70,002	$ 54,310	$ 52,128
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and accretion	1,281	1,005	838
(Recovery of) provision for loan losses	(2,310)	3,006	4,395
Depreciation of premises and equipment	5,087	5,884	6,235
Deferred income tax expense	(1,244)	14,909	3,817
Net periodic employee benefit cost	471	298	515
Payment for Pension Benefits	(1,509)	0	0
Realized investment securities losses (gains)	90	(4,476)	(3,513)
Stock-based compensation expense	2,151	2,097	2,018
Excess Tax Benefit from Share-based Compensation, Operating Activities	(506)	(558)	0
Increase in value of bank-owned life insurance	(3,090)	(2,708)	(3,071)
Proceeds from life insurance	425	1,717	258
Originations of loans held for sale	(15,196)	(16,451)	(17,981)
Proceeds from loans held for sale	13,993	19,290	16,572
Gain on sale of loans	(351)	(516)	(374)
Asset write down	491	0	444
Change in accrued interest receivable	(1,500)	(815)	(976)
Change in other assets	(836)	1,277	(1,556)
Change in other liabilities	5,624	(426)	5,581
Net Cash Provided by Operating Activities	73,073	77,843	65,330
Investing Activities
Proceeds from sales of securities available-for-sale	0	5,776	30,850
Proceeds from maturities and calls of securities available-for-sale	88,112	86,276	78,720
Proceeds from maturities and calls of securities held-to-maturity	8,439	10,580	13,479
Purchases of securities available-for-sale	(166,226)	(187,031)	(196,150)
Purchases of securities held-to-maturity	(4,925)	0	0
Net increase in loans	(95,284)	(85,489)	(183,511)
Purchases of premises and equipment	(10,192)	(6,574)	(5,517)
Disposals of premises and equipment	3,884	3,057	836
Net Cash Used in Investing Activities	(163,966)	(173,405)	(261,293)
Financing Activities
Net increase (decrease) in noninterest-bearing deposits	32,097	(5,647)	200,984
Net increase (decrease) in interest-bearing deposits	156,302	89,644	(52,714)
Net increase in short-term borrowings	7,667	3,914	93,436
Repayments of Subordinated Debt	(16,495)
Proceeds from the Redemption of Capital Securities	495
Issuance of common stock	0	28,408	6,864
Purchases of treasury stock	(20,271)	0	(10,018)
Proceeds from exercise of stock options	1,164	732	1,155
Dividends paid	(29,583)	(27,120)	(25,718)
Net Cash Provided by Financing Activities	131,376	89,931	213,989
Increase (Decrease) in Cash and Cash Equivalents	40,483	(5,631)	18,026
Cash and cash equivalents at beginning of period	82,508	88,139	70,113
Cash and Cash Equivalents at End of Period	122,991	$ 82,508	$ 88,139
Farmers Deposit Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	20,691
Investing Activities
Payments to Acquire Businesses, Net of Cash Acquired	(20,691)
Poage Bankshares, Inc. [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	(32,917)
Investing Activities
Payments to Acquire Businesses, Net of Cash Acquired	$ 32,917