CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income	$ 30,506	$ 24,414
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	2,303	367
Depreciation and amortization	3,076	3,260
Stock-based compensation expense	1,954	1,487
Pension expense (income)	(156)	(319)
Net amortization (accretion) on investment securities	2,801	2,176
Net (gains) losses on sales of investment securities	0	(516)
Originations of loans held for sale	(22,383)	(32,085)
Net gains from sales of loans held for sale	(588)	(1,216)
Proceeds from sales of loans held for sale	24,542	38,633
Deferred income taxes	(1,736)	75
Decrease (increase) cash surrender value of life insurance	(786)	448
Decrease (increase) in interest receivable	(1,687)	(1,735)
Decrease (increase) in indemnification asset	(1,900)	(1,244)
(Decrease) increase in interest payable	(1,013)	(1,424)
Decrease (increase) in other assets	15,414	957
(Decrease) increase in other liabilities	(3,391)	(3,082)
Net cash provided by (used in) operating activities	52,328	31,788
Investing activities
Proceeds from sales of securities available-for-sale	0	22,239
Proceeds from calls, paydowns and maturities of securities available-for-sale	52,252	49,418
Purchases of securities available-for-sale	(77,037)	(219,761)
Proceeds from calls, paydowns and maturities of securities held-to-maturity	19,718	38,497
Payments to Acquire Held-to-maturity Securities	0	14,441
Net decrease (increase) in interest-bearing deposits with other banks	23,774	43,392
Net decrease (increase) in loans and leases	(89,526)	1,257
Proceeds from disposal of other real estate owned	2,222	1,162
Purchases of premises and equipment	(4,979)	(3,066)
Net cash provided by (used in) investing activities	(73,576)	(81,303)
Financing activities
Net (decrease) increase in total deposits	115,458	4,088
Net (decrease) increase in short-term borrowings	(156,233)	51,272
Proceeds from FHLB borrowings	50,000	0
Cash dividends paid on common stock	(22,183)	(9,811)
Proceeds from exercise of stock options	137	282
Net cash provided by (used in) financing activities	(12,821)	45,831
Cash and due from banks:
Change in cash and due from banks	(34,069)	(3,684)
Cash and due from banks at beginning of period	150,650	121,598
Cash and due from banks at end of period	$ 116,581	$ 117,914