Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net income	$ 92,061	$ 83,914
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	19,408	22,300
Depreciation and amortization of premises and equipment	7,106	6,957
Net amortization on securities	2,495	3,108
Amortization of intangible assets	2,735	3,064
Amortization of operating lease right-of-use assets	5,396	0
Excess tax benefit on stock-based compensation	(371)	(507)
Stock-based compensation expense	3,596	3,457
Bank owned life insurance income	(4,119)	(3,852)
Proceeds from sale of loans held for sale	109,661	73,239
Originations of loans held for sale	(119,753)	(76,959)
Net gains on sale of loans held for sale	(475)	(181)
Net security (gains)	(4,024)	(575)
Net (gains) losses on sale of other real estate owned	(178)	130
Net change in other assets and other liabilities	(9,579)	(14,313)
Net cash provided by operating activities	103,959	99,782
Investing activities
Net cash used in acquisitions	0	(7,884)
Securities available for sale:
Proceeds from maturities, calls and principal paydowns	226,070	213,732
Proceeds from sales	26,203	0
Purchases	(160,781)	(102,004)
Securities held to maturity:
Proceeds from maturities, calls and principal paydowns	165,997	73,217
Purchases	(61,150)	(249,300)
Equity securities:
Proceeds from sales	3,966	3,318
Purchases	(93)	(2)
Other:
Net increase in loans	(146,778)	(323,614)
Proceeds from Federal Home Loan Bank stock redemption	147,200	186,869
Purchases of Federal Reserve and Federal Home Loan Bank stock	(131,461)	(192,584)
Proceeds from settlement of bank owned life insurance	1,085	0
Purchases of premises and equipment, net	(4,018)	(4,256)
Proceeds from sales of other real estate owned	1,129	2,124
Net cash provided by (used in) investing activities	67,369	(400,384)
Financing activities
Net increase in deposits	374,955	270,654
Net (decrease) increase in short-term borrowings	(428,430)	92,585
Proceeds from issuance of long-term debt	10,598	25,000
Repayments of long-term debt	(83)	(40,117)
Proceeds from the issuance of shares to employee and other stock plans	543	1,140
Cash paid by employer for tax-withholdings on stock issuance	(1,596)	(1,792)
Cash dividends	(34,174)	(31,899)
Net cash (used in) provided by financing activities	(78,187)	315,571
Net increase in cash and cash equivalents	93,141	14,969
Cash and cash equivalents at beginning of period	180,955	159,664
Cash and cash equivalents at end of period	274,096	174,633
Cash paid during the period for:
Interest expense	42,709	26,002
Income taxes paid, net of refund	19,945	31,077
Noncash investing activities:
Loans transferred to other real estate owned	654	996
Acquisitions:
Fair value of assets acquired	$ 0	$ 6,274