Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income	$ 44,646	$ 37,476
Adjustments to reconcile net income to net cash provided by operating activities:
Accretion and amortization	836	436
Provision for loan losses	2,584	3,093
Depreciation	4,486	4,719
Deferred income tax expense	3,810	3,998
Net periodic employee benefit cost	337	386
Realized investment securities gains	(4,276)	(3,978)
Investment securities impairment losses	0	465
Stock-compensation expense	1,653	1,606
Excess tax benefit from stock-compensation expense	(550)	0
Proceeds from bank-owned life insurance	1,717	0
Increase in value of bank-owned life insurance	(1,974)	(2,374)
Loans originated for sale	(13,858)	(11,537)
Proceeds from the sale of loans originated for sale	16,315	11,637
Gain on sale of loans	(437)	(268)
Change in accrued interest receivable	(828)	(554)
Asset write down	0	444
Change in other assets	1,562	(14,068)
Change in other liabilities	(1,505)	16,338
Net Cash Provided by Operating Activities	54,518	47,819
Investing Activities
Proceeds from sales of securities available-for-sale	5,576	30,850
Proceeds from maturities and calls of securities available-for-sale	61,367	55,565
Proceeds from maturities and calls of securities held-to-maturity	8,072	9,194
Purchases of securities available-for-sale	(136,418)	(141,271)
Net increase in loans	(63,139)	(96,007)
Purchases of premises and equipment	(4,262)	(3,553)
Disposals of premises and equipment	2,500	408
Net Cash (Used in) Investing Activities	(126,304)	(144,814)
Financing Activities
Net (decrease) increase in non-interest-bearing deposits	(2,410)	48,792
Net increase in interest-bearing deposits	27,307	46,963
Net increase in short-term borrowings	33,159	24,515
Proceeds from issuance of common stock	28,408	0
Purchases of treasury stock	0	(10,018)
Proceeds from stock option exercises	597	705
Dividends paid	(20,249)	(19,266)
Net Cash Provided by Financing Activities	66,812	91,691
(Decrease) in Cash and Cash Equivalents	(4,974)	(5,304)
Cash and cash equivalents at beginning of period	88,139	70,113
Cash and Cash Equivalents at End of Period	$ 83,165	$ 64,809