Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities
Net income	$ 59,750	$ 61,900
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses, net	3,990	3,393
Depreciation and amortization	18,529	17,956
Net amortization of securities	4,355	3,964
Securities gains, net	0	(389)
Gains on sales of loans, net	(8,828)	(4,584)
Deferred income tax provision	9,700	14,000
Proceeds from sales of loans held for sale	588,771	402,463
Purchases and originations of loans held for sale	(617,089)	(394,266)
Originations and sales of mortgage servicing rights, net	(8,157)	(5,179)
Increase in bank-owned life insurance	(2,370)	(2,337)
Net decrease (increase) in other assets	10,464	(99)
Net decrease in other liabilities	(2,427)	(15,827)
Other operating activities, net	(1,015)	10,151
Net cash provided by operating activities	55,673	91,146
Investing Activities
Proceeds from calls and maturities of securities held to maturity	62,454	39,903
Proceeds from calls and maturities of securities available for sale	218,337	166,089
Proceeds from sales of securities available for sale	0	26,274
Purchases of securities held to maturity	(48,946)	(25,252)
Purchases of securities available for sale	(328,576)	(360,703)
Proceeds from bank owned life insurance	655	0
Net decrease in federal funds sold and securities purchased under reverse repurchase agreements	1,885	2,253
Net decrease in member bank stock	3,815	0
Net decrease (increase) in loans	65,186	(256,722)
Purchases of premises and equipment	(6,062)	(6,132)
Proceeds from sales of premises and equipment	2,895	4,632
Proceeds from sales of other real estate	22,453	21,672
Purchases of software	(4,490)	0
Investments in tax credit and other partnerships	(116)	0
Net cash used in investing activities	(10,510)	(387,986)
Financing Activities
Net increase in deposits	93,816	464
Net increase in federal funds purchased and securities sold under repurchase agreements	33,919	307,729
Net decrease in short-term borrowings	(201,421)	(1,673)
Payments on long-term FHLB advances	(47)	(109)
Common stock dividends	(31,294)	(31,224)
Common stock issued-net, long-term incentive plans	(842)	(795)
Excess tax expense from stock-based compensation arrangements	(217)	(353)
Net cash (used in) provided by financing activities	(106,086)	274,039
Decrease in cash and cash equivalents	(60,923)	(22,801)
Cash and cash equivalents at beginning of period	315,973	345,761
Cash and cash equivalents at end of period	$ 255,050	$ 322,960