Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Operating Activities:
Net income	$ 148,737		$ 135,795
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	27,750		24,500
Deferred tax expense	4,388		11,221
Depreciation and amortization	23,509		27,455
Amortization of earning assets and funding premium/discount, net	37,127		50,781
Stock-based compensation	7,793		7,757
Gain on sale, net of write-down, on foreclosed and repossessed assets	(1,059)		(1,072)
Gain on sale, net of write-down, on premises and equipment	(349)		(59)
Impairment loss recognized in earnings	246		0
(Gain) loss on alternative investments	(713)		354
Loss on fair value adjustment of derivative instruments	585		290
Net gain on the sale of investment securities	(4,378)		(708)
Increase in cash surrender value of life insurance policies	(9,900)		(10,348)
Gain from life insurance policies	(671)		(1,070)
Gain on sale of loans held for sale	(3,093)		(13,584)
Proceeds from sale of loans held for sale	207,530		670,226
Originations of loans held for sale	(209,585)		(592,368)
Net (increase) decrease in accrued interest receivable and other assets	(51,113)		82,805
Net increase (decrease) in accrued expenses and other liabilities	18,953		(16,743)
Net cash provided by operating activities	195,757		375,232
Investing Activities:
Net (increase) decrease in interest-bearing deposits	(81,720)		37,243
Purchases of available-for-sale securities	(92,343)		(835,364)
Proceeds from maturities and principal payments of available-for-sale securities	317,973		621,385
Proceeds from sales of available-for-sale securities	38,075	[1]	44,261	[1]
Purchases of held-to-maturity securities	(732,767)		(702,017)
Proceeds from maturities and principal payments of held-to-maturity securities	431,571		587,998
Net purchase of Federal Home Loan Bank stock	(12,296)		(3,248)
Net increase in loans	(840,342)		(503,397)
Proceeds from life insurance policies	760		1,768
Proceeds from the sale of foreclosed properties and repossessed assets	7,804		5,741
Proceeds from the sale of premises and equipment	2,641		1,304
Purchases of premises and equipment	(19,908)		(11,247)
Net cash used for investing activities	(980,552)		(755,573)
Financing Activities:
Net increase in deposits	692,498		468,696
Proceeds from Federal Home Loan Bank advances	5,352,931		3,178,120
Repayments of Federal Home Loan Bank advances	(5,115,130)		(3,403,245)
Net (decrease) increase in securities sold under agreements to repurchase and other borrowings	(94,687)		296,130
Issuance of long-term debt	150,000		0
Repayment of long-term debt	(150,000)		(102,579)
Dividends paid to common shareholders	(49,672)		(35,176)
Dividends paid to preferred shareholders	(7,917)		(8,164)
Exercise of stock options	1,739		984
Excess tax benefits from stock-based compensation	1,068		255
Common stock issued	436		195
Common stock repurchased	(10,741)		0
Shares acquired related to employee share-based compensation plans	(2,218)		(381)
Common stock warrants repurchased	0		(30)
Net cash provided by financing activities	768,307		394,805
Net (decrease) increase in cash and due from banks	(16,488)		14,464
Cash and due from banks at beginning of period	223,616		252,283
Cash and due from banks at end of period	207,128		266,747
Supplemental disclosure of cash flow information:
Interest paid	69,737		66,582
Income taxes paid	82,155		42,507
Noncash investing and financing activities:
Transfer of loans and leases, net to foreclosed properties and repossessed assets	$ 3,289		$ 9,295

[1] Proceeds from sales, for the three and nine months ended September 30, 2014, does not include $25.3 million of unsettled sales transactions at September 30, 2014. The gross realized gains and gross realized losses for the three and nine months ended September 30, 2014 reflect the unsettled sales transactions.