Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net income per consolidated statements of income	$ 33,339	$ 36,830
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses, net	1,689	4,111
Depreciation and amortization	9,337	9,376
Net amortization of securities	2,007	2,582
Gains on sales of loans, net	(3,576)	(4,585)
Compensation expense, long-term incentive plan	1,002	785
Deferred income tax provision	(1,400)	3,300
Proceeds from sales of loans held for sale	212,508	241,778
Purchases and originations of loans held for sale	(235,550)	(223,799)
Originations of mortgage servicing rights	(2,507)	(3,567)
Earnings on bank-owned life insurance	(1,354)	(1,233)
Net change in other assets	(1,576)	8,721
Net change in other liabilities	(9,853)	(7,379)
Other operating activities, net	10,806	(9,147)
Net cash from operating activities	14,872	57,773
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	25,361	33,102
Proceeds from maturities, prepayments and calls of securities available for sale	106,990	112,280
Purchases of securities available for sale	0	(1,390)
Net change in federal funds sold and securities purchased under reverse repurchase agreements	830	503
Net change in member bank stock	(70)	16,415
Net change in loans	(148,108)	100,619
Purchases of premises and equipment	(4,407)	(2,862)
Proceeds from sales of premises and equipment	1,848	4
Proceeds from sales of other real estate	1,780	5,310
Purchases of software	(3,753)	(841)
Investments in tax credit and other partnerships	(3,426)	(17)
Purchase of insurance book of business	(81)	0
Net cash from investing activities	(23,036)	263,123
Financing Activities
Net change in deposits	170,404	398,289
Net change in federal funds purchased and securities sold under repurchase agreements	(3,604)	(194,994)
Net change in short-term borrowings	(90)	(525,124)
Payments on long-term FHLB advances	(17)	(17)
Payments under finance lease obligations	(513)	0
Common stock dividends	(15,033)	(15,660)
Repurchase and retirement of common stock	(36,893)	(2,502)
Shares withheld to pay taxes, long-term incentive plan	(1,604)	(1,380)
Net cash from financing activities	112,650	(341,388)
Net change in cash and cash equivalents	104,486	(20,492)
Cash and cash equivalents at beginning of period	349,561	335,768
Cash and cash equivalents at end of period	$ 454,047	$ 315,276