CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities
Net income	$ 71,976	$ 65,232
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	3,787	7,379
Depreciation and amortization	9,504	9,753
Stock-based compensation expense	4,031	3,902
Pension expense (income)	(956)	(675)
Net amortization (accretion) on investment securities	7,916	6,213
Net (gains) losses on sales of investment securities	(1,630)	(234)
Originations of loans held for sale	(123,387)	(172,950)
Net gains from sales of loans held for sale	(3,998)	(5,093)
Proceeds from sales of loans held for sale	123,415	181,263
Deferred income taxes	3,977	271
Decrease (increase) cash surrender value of life insurance	(563)
Life Insurance, Corporate or Bank Owned, Change in Value		342
Decrease (increase) in interest receivable	(4,069)	(1,183)
Decrease (increase) in indemnification asset	(3,840)	(4,343)
(Decrease) increase in interest payable	(1,052)	(1,480)
Decrease (increase) in other assets	1,247	(21,301)
(Decrease) increase in other liabilities	(1,046)	2,634
Net cash provided by (used in) operating activities	92,992	77,732
Investing activities
Proceeds from sales of securities available-for-sale	179,517	206,909
Proceeds from calls, paydowns and maturities of securities available-for-sale	158,454	119,437
Purchases of securities available-for-sale	(563,172)	(225,117)
Proceeds from Sale of Held-to-maturity Securities	0	4,862
Proceeds from calls, paydowns and maturities of securities held-to-maturity	98,824	89,529
Payments to Acquire Held-to-maturity Securities	15,465	0
Net decrease (increase) in interest-bearing deposits with other banks	47,663	16,969
Net decrease (increase) in loans and leases	(230,174)	(406,005)
Proceeds from disposal of other real estate owned	6,797	6,908
Purchases of premises and equipment	(4,798)	(6,427)
Net cash provided by (used in) investing activities	(322,354)	(192,935)
Financing activities
Net (decrease) increase in total deposits	200,302	159,059
Net (decrease) increase in short-term borrowings	55,820	(12,189)
Payments of long-term debt	94	86
Cash dividends paid on common stock	(30,708)	(29,318)
Proceeds from exercise of stock options	284	653
Excess tax benefit on share-based compensation	0	225
Net cash provided by (used in) financing activities	225,604	118,344
Cash and due from banks:
Change in cash and due from banks	(3,758)	3,141
Cash and due from banks at beginning of period	121,598	114,841
Cash and due from banks at end of period	$ 117,840	$ 117,982