Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net income		$ 35,516	$ 30,848
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization/accretion		12,594	12,068
Reversal of provision for loan losses			(1,900)
Net amortization of deferred loan (fees) costs		(112)	21
Increase in interest income receivable		(1,375)	(415)
Life insurance premiums paid		(406)	(126)
Decrease in income taxes receivable		2,556	91
(Increase) decrease in net deferred tax asset		(204)	262
Decrease in other assets		60	1,155
Stock option compensation expense		1,050	912
Increase in interest expense payable		50	33
Increase (decrease) in other liabilities		137	(2,553)
Equity securities losses		50
Net writedown of premises and equipment		3	60
Net gain on sale of foreclosed assets		(46)	(72)
Writedown of foreclosed assets		27
Net Cash Provided by Operating Activities		49,900	40,384
Investing Activities:
Net repayments of loans		89,041	35,852
Net payments under FDIC(1) indemnification agreements	[1]		(63)
Purchases of debt securities available for sale		(439,212)	(253,658)
Proceeds from sale/maturity/calls of debt securities available for sale		220,037	171,632
Proceeds from maturity/calls of debt securities held to maturity		78,551	80,433
Purchases of premises and equipment		(2,309)	(1,050)
Net change in FRB(2) stock	[2]		24
Proceeds from sale of foreclosed assets		506	1,521
Net Cash (Used in) Provided by Investing Activities		(53,386)	34,691
Financing Activities:
Net increase (decrease) in deposits		59,509	(22,171)
Net change in short-term borrowings		10,423	16,691
Exercise of stock options		9,483	18,290
Retirement of common stock		(524)	(314)
Common stock dividends paid		(21,261)	(20,480)
Net Cash Provided by (Used in) Financing Activities		57,630	(7,984)
Net Change In Cash and Due from Banks		54,144	67,091
Cash and Due from Banks at Beginning of Period		575,002	462,271
Cash and Due from Banks at End of Period		629,146	529,362
Supplemental disclosure of non cash activities:
Loan collateral transferred to other real estate owned
Securities purchases pending settlement		3,159	649
Supplemental disclosure of cash flow activities:
Interest paid for the period		885	955
Income tax payments for the period		$ 6,776	$ 10,998

[1] Federal Deposit Insurance Corporation ("FDIC")

[2] Federal Reserve Bank ("FRB")