CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows From Operating Activities:
Net income	$ 19,683	$ 17,924
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,361	6,964
Net gains on sales of securities		(387)
Stock-based compensation expense	1,658	1,471
Provision for loan losses		(1,000)
Increase in income tax benefit		(121)
Increase in income tax liability	551	973
Increase in pension liability	3,476	3,102
Increase in accounts receivable	(3,637)	(3,742)
Other operating activities, net	(2,156)	431
Net cash provided by operating activities	27,936	25,615
Cash Flows From Investing Activities:
Proceeds from sales of securities available-for-sale		21,491
Proceeds from maturities of securities available-for-sale	33,856	29,970
Purchase of securities available-for-sale	(97,473)	(57,637)
Net decrease (increase) in loans	6,803	(25,781)
Net increase in payments in excess of funding	(14,455)	(5,808)
Purchases of premises and equipment, net	(2,780)	(3,549)
Net cash used in investing activities	(74,049)	(41,314)
Cash Flows From Financing Activities:
Net (decrease) increase in noninterest-bearing demand deposits	(3,243)	20,561
Net decrease in interest-bearing demand and savings deposits	(6,504)	(37,855)
Net decrease in time deposits	(2,984)	(5,177)
Net increase in accounts and drafts payable	44,946	105,503
Cash dividends paid	(7,725)	(7,406)
Purchase of common shares for treasury	(2,270)	(9,217)
Other financing activities, net	(752)	(779)
Net cash provided by financing activities	21,468	65,630
Net (decrease) increase in cash and cash equivalents	(24,645)	49,931
Cash and cash equivalents at beginning of period	266,743	253,172
Cash and cash equivalents at end of period	242,098	303,103
Supplemental information:
Cash paid for interest	1,520	1,517
Cash paid for income taxes	$ 5,758	$ 5,128