CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net income	$ 25,469	$ 21,917
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based and non-cash compensation	1,014	848
Depreciation	2,671	2,384
Amortization of intangible assets	2,094	1,515
Provision for loan losses	2,111	1,008
Provision for deferred income taxes	1,751	3,172
Amortization of security premiums and discounts, net	1,355	2,324
Accretion of premiums and discounts on time deposits and trust preferred securities, net	(263)	(12)
Accretion of premiums and discounts on portfolio loans, net	(2,694)	(3,398)
Amortization of discount on FHLB advances	(4)
Security loss (gain), net	175
Unrealized losses recorded	(216)
Change in equity securities, net		350
Gain on sales of mortgage loans, net of origination costs	(2,141)	(2,093)
Mortgage loans originated for sale	(83,950)	(97,138)
Proceeds from sales of mortgage loans	93,463	165,045
Net losses on disposition of premises and equipment	24	52
Decrease in deferred compensation	(3,339)
Increase in cash surrender value of bank owned life insurance	(884)	(726)
Change in assets and liabilities:
(Increase) decrease in other assets	(3,121)	2,845
(Decrease) in other liabilities	(3,427)	(10,401)
Increase in interest payable	357	1,550
Increase in income taxes receivable	5,824	4,421
Net cash provided by operating activities	36,269	93,663
Cash Flows from Investing Activities
Proceeds from sales of securities classified available for sale	141,798
Proceeds from sales of securities classified equity	958
Proceeds from maturities of securities classified available for sale	43,435	43,066
Proceeds from maturities of securities classified held to maturity	13,822	8,012
Purchase of securities classified available for sale	(125,464)	(2,164)
Purchase of securities classified held to maturity		(24,868)
Net increase in loans	(72,655)	(10,844)
Proceeds from sale of OREO properties	147	639
Purchases of premises and equipment	(1,052)	(4,508)
Proceeds from the redemption of FHLB stock, net		4,864
Net cash paid in acquisitions	(49,387)
Net cash (used in) provided by investing activities	(48,398)	14,197
Cash Flows from Financing Activities
Net increase (decrease) in certificates of deposit	(25,958)	72,764
Net (decrease) increase in demand deposits, money market and savings accounts	100,960	132,493
Net (decrease) increase in federal funds purchased and securities sold under agreements to repurchase	(19,318)	(69,255)
Repayment of FHLB advances, net	(1,121)
Repayment of short-term borrowings		(220,000)
Net proceeds from long-term debt	60,000
Cash dividends paid	(10,266)	(9,739)
Repayments of long-term debt	(1,500)
Proceeds from stock options exercised		130
Common stock issuance costs	(234)
Net cash (used in) provided by financing activities	102,563	(93,607)
Net increase in cash and cash equivalents	90,434	14,253
Cash and cash equivalents, beginning of period	239,973	353,272
Cash and cash equivalents, ending of period	330,407	367,525
Cash payments for:
Interest	14,876	7,325
Income taxes	690
Non-cash Investing and Financing Activities:
Other real estate acquired in settlement of loans	577	$ 348
Transfer of investment securities held to maturity to available for sale	$ 573,639