Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 49,115	$ 48,576
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,899	7,961
Provision for loan losses	7,963	9,578
Losses (gains) on other real estate owned	1,388	(10)
Deferred tax expense	13,182	5,341
Increase in cash surrender value of life insurance contracts	(2,282)	(4,666)
Net decrease in loans originated for sale	9,264	15,670
(Gains) Losses on disposals of other assets	(1,682)	124
Net amortization of securities premium/discount	4,236	10,401
Amortization of intangible assets	7,038	7,555
Amortization of FDIC Indemnification Asset	3,908
Stock-based compensation expense	3,832	3,535
Decrease in interest payable and other liabilities	(7,814)	(7,795)
Funds collected under FDIC loss share agreements		29,875
Increase in FDIC loss share receivable	(1,414)	(3,490)
Decrease in other assets	6,545	9,803
Other, net	1,947	(102)
Net cash provided by operating activities	103,125	132,356
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	1,301
Proceeds from maturities of securities available for sale	76,221	193,403
Purchases of securities available for sale	(24,703)	(1,017,609)
Proceeds from maturities of securities held to maturity	183,363	161,558
Purchases of securities held to maturity		(308,988)
Net (increase) decrease in interest-bearing bank deposits	(12,086)	1,024,541
Net decrease (increase) in federal funds sold and short-term investments	553	(30)
Net (increase) decrease in loans	(217,289)	74,269
Purchases of property, equipment and intangible assets	(6,111)	(11,719)
Proceeds from sales of property and equipment	6,562	99
Proceeds from sales of other real estate	11,348	38,242
Other, net	758	(2,483)
Net cash provided by investing activities	19,917	151,283
CASH FLOWS FROM FINANCING ACTIVITIES:
Net decrease in deposits	(85,742)	(490,837)
Net increase in short-term borrowings	54,674	83,404
Repayments of long-term debt	(8,955)	(8,822)
Issuance of long-term debt	3,130	6,153
Dividends paid	(20,219)	(20,786)
Proceeds from exercise of stock options	654	233
Net cash used in financing activities	(56,458)	(430,655)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	66,584	(147,016)
CASH AND DUE FROM BANKS, BEGINNING	348,440	448,491
CASH AND DUE FROM BANKS, ENDING	415,024	301,475
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 6,337	$ 13,322