Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows From Operating Activities
Net income	$ 72,460	$ 38,214	$ 13,737
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	9,674	8,990	8,853
Amortization and impairment of other intangible assets	8,829	6,129	6,508
Net premium (discount) amortization on investment securities	12,135	7,590	2,188
Change in FDIC indemnification asset	426	0	0
Stock compensation expense	3,436	2,369	1,310
Provision for loan losses	7,473	30,781	63,280
Net securities gains	(8,691)	(17,124)	(27,251)
Impairment on available-for-sale securities	1,409	3,927	24,795
Gain on sale leasebacks	(7,864)	(6,452)	(6,301)
Gain on derivatives	(974)	(1,492)	(719)
Net gains on sales and write-downs of loans and other assets	(2,677)	(1,410)	(1,141)
(Gain) loss on retirement of debt	789	6,107	3,941
Increase in cash surrender value of company-owned life insurance	(5,295)	(1,540)	(1,526)
Residential real estate loans originated for sale	(84,303)	(57,523)	(259,664)
Proceeds from sale of residential real estate loans	93,757	72,773	262,784
(Increase) decrease in interest receivable	4,725	6,369	(278)
(Increase) decrease in other assets	26,161	16,797	(44,008)
Increase (decrease) in accrued expenses and other liabilities	12,276	(17,995)	(6,212)
Total adjustments	71,286	58,296	26,559
Net cash flows provided by operating activities	143,746	96,510	40,296
Cash Flows From Investing Activities
Cash and cash equivalents of acquired banks	398,558	0	389,917
Payments related to branch divestiture	(106,392)	0	0
Purchase of trust assets	(1,301)	0	0
Net cash paid in FDIC-assisted transaction	(151,264)	0	0
Purchases of investment securities available-for-sale	(550,934)	(1,106,040)	(2,274,090)
Purchases of investment securities held-to-maturity	0	(255,828)	(98,544)
Purchase of loans	0	(7,660)	(8,024)
Proceeds from maturities, prepayments and calls of investment securities available-for-sale	521,553	1,046,431	697,082
Proceeds from sale of trading securities	1,078	0	0
Proceeds from sales of investment securities available-for-sale	545,995	481,471	1,042,138
Proceeds from maturities, prepayments and calls of investment securities held-to-maturity	154,675	150,837	29,230
Proceeds from redemption of FHLB stock	18,622	4,153	5,000
Proceeds from sale of loans and leases	5,364	3,627	259,127
Net principal collected from (loans made to) loan customers	180,358	123,308	562,452
Proceeds from sale of premises and equipment and other assets	487	32	405
Proceeds from sale leaseback of real estate	0	3,697	10,836
Purchases of premises and equipment and other assets	(11,486)	(7,460)	(13,944)
Net cash flows provided by (used in) investing activities	1,005,313	436,568	601,585
Cash Flows From Financing Activities
Deposits	(841,885)	(440,563)	55,669
Short-term borrowings	56,434	(32,912)	(318,479)
Payments for maturities on other borrowings	(153,383)	(75,821)	(5,264)
Proceeds from issuance of other borrowings	0	75,000	0
Payments related to retirement of debt	(211,228)	(279,649)	(133,949)
Cash dividends paid on common stock	(26,513)	(24,361)	(30,380)
Cash dividends paid on preferred stock	0	0	(1,514)
Common stock repurchased	(1,526)	(705)	(353)
Proceeds from exercise of stock options, including tax benefit	140	12	97
Repurchase of TARP preferred stock and warrants	0	0	(101,200)
Common stock issued	222	197	197,756
Net cash flows used in financing activities	(1,177,739)	(778,802)	(337,617)
Net increase (decrease) in cash and cash equivalents	(28,680)	(245,724)	304,264
Cash and cash equivalents at beginning of period	251,552	497,276	193,012
Cash and cash equivalents at end of period	$ 222,872	$ 251,552	$ 497,276