Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 59,283	$ 44,646
Adjustments to reconcile net income to net cash provided by operating activities:
Accretion and amortization	1,154	836
(Recovery of) provision for loan losses	(1,910)	2,584
Depreciation of premises and equipment	3,819	4,486
Deferred income tax expense	921	3,810
Net periodic employee benefit cost	438	337
Unrealized gains recognized on securities still held	(1,155)
Realized investment securities gains	0	(4,276)
Stock-compensation expense	1,697	1,653
Excess tax benefit from stock-compensation expense	(155)	(550)
Proceeds from life insurance	425	1,717
Increase in value of bank-owned life insurance	(1,932)	(1,974)
Loans originated for sale	(9,286)	(13,858)
Proceeds from the sale of loans originated for sale	9,601	16,315
Gain on sale of loans	(249)	(437)
Change in accrued interest receivable	(2,226)	(828)
Change in other assets	(15,709)	1,562
Change in other liabilities	11,543	(1,505)
Net Cash Provided by Operating Activities	56,259	54,518
Investing Activities
Proceeds from sales of securities available-for-sale	0	5,576
Proceeds from maturities and calls of securities available-for-sale	53,917	61,367
Proceeds from maturities and calls of securities held-to-maturity	6,552	8,072
Purchases of securities available-for-sale	(101,227)	(136,418)
Net increase in loans	(19,057)	(63,139)
Purchases of premises and equipment	(4,236)	(4,262)
Disposals of premises and equipment	772	2,500
Net Cash Used in Investing Activities	(63,279)	(126,304)
Financing Activities
Net increase in non-interest-bearing deposits	5,403	(2,410)
Net increase in interest-bearing deposits	122,594	27,307
Net increase (decrease) in short-term borrowings	137,905	33,159
Proceeds from issuance of common stock	0	28,408
Purchases of treasury stock	(15,230)	0
Proceeds from stock option exercises	1,149	597
Dividends paid	(21,399)	(20,249)
Net Cash Provided by Financing Activities	230,422	66,812
Increase (Decrease) in Cash and Cash Equivalents	223,402	(4,974)
Cash and cash equivalents at beginning of period	82,508	88,139
Cash and Cash Equivalents at End of Period	$ 305,910	$ 83,165