Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 135,630	$ 128,640
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,976	24,178
Provision for loan losses	24,122	25,404
(Gain) loss on other real estate owned	(34)	3,519
Deferred tax expense	24,295	20,807
Increase in cash surrender value of life insurance contracts	(6,960)	(8,764)
Gain on disposal of other assets	(1,411)
Write-downs on closed branch transfers to other real estate owned	2,683	8,450
Net decrease in loans originated for sale	7,017	35,497
Net amortization of securities premium/discount	12,891	27,095
Amortization of intangible assets	20,352	22,292
Amortization of FDIC indemnification asset	9,989	590
Stock-based compensation expense	10,514	10,435
(Decrease) increase in interest payable and other liabilities	(9,132)	7,673
Net payments (to) from FDIC	(366)	60,886
Decrease (increase) in FDIC loss share receivable	7,729	(7,108)
Decrease in other assets	21,086	43,091
Other, net	6,256	8,502
Net cash provided by operating activities	287,637	411,187
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	1,301
Proceeds from maturities of securities available for sale	218,351	510,886
Purchases of securities available for sale	(440,187)	(1,017,578)
Proceeds from maturities of securities held to maturity	358,649	419,334
Purchases of securities held to maturity	(1,031)	(450,661)
Net (increase) decrease in interest-bearing bank deposits	(199,982)	1,052,369
Net increase in federal funds sold and short-term investments	(2,736)	(14,493)
Net increase in loans	(1,060,864)	(229,913)
Purchase of life insurance contracts	(30,000)
Purchases of property and equipment	(14,370)	(25,855)
Proceeds from sales of property and equipment	8,607
Proceeds from sales of other real estate	42,913	70,220
Other, net	4,273	(7,280)
Net cash (used in) provided by investing activities	(1,115,076)	307,029
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in deposits	376,178	(689,317)
Net increase in short-term borrowings	513,849	143,646
Repayments of long-term debt	(26,558)	(26,469)
Issuance of long-term debt	17,184	6,544
Dividends paid	(60,290)	(61,000)
Repurchase of common stock	(9,967)	(115,000)
Proceeds from exercise of stock options	962	582
Net cash provided by (used in) financing activities	811,358	(741,014)
NET DECREASE IN CASH AND DUE FROM BANKS	(16,081)	(22,798)
CASH AND DUE FROM BANKS, BEGINNING	348,440	448,491
CASH AND DUE FROM BANKS, ENDING	332,359	425,693
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	23,920	42,070
Transfers from available for sale securities to held to maturity securities		$ 983,162