CONSOLIDATED STATEMENTS OF CONDITION (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets:
Cash and cash equivalents	$ 324,878	$ 211,837
Available-for-sale investment securities (cost of $1,453,460 and $1,076,030, respectively)	1,538,973	1,085,963
Held-to-maturity investment securities (fair value of $617,835 and $625,789, respectively)	553,495	602,908
Other securities, at cost	58,902	53,453
Loans held for sale, at fair value	532	3,952
Loans	3,471,025	3,026,363
Allowance for loan losses	(42,213)	(42,510)
Net loans	3,428,812	2,983,853
Intangible assets related to [Abstract]
Core deposit intangibles, net	11,519	10,897
Goodwill	345,050	297,692
Other intangibles, net	3,995	3,125
Intangible assets, net	360,564	311,714
Premises and equipment, net	85,956	81,561
Accrued interest receivable	28,579	26,136
Other assets	107,584	83,129
Total assets	6,488,275	5,444,506
Liabilities:
Noninterest-bearing deposits	894,464	741,166
Interest-bearing deposits	3,900,781	3,192,879
Total deposits	4,795,245	3,934,045
Borrowings	728,281	728,460
Subordinated debt held by unconsolidated subsidiary trusts	102,048	102,024
Accrued interest and other liabilities	88,118	72,719
Total liabilities	5,713,692	4,837,248
Commitments and contingencies (See Note N)
Shareholders' equity:
Preferred stock $1.00 par value, 500,000 shares authorized, 0 shares issued	0	0
Common stock, $1.00 par value, 50,000,000 shares authorized; 37,794,532 and 34,131,289 shares issued, respectively	37,795	34,131
Additional paid-in capital	313,501	225,543
Retained earnings	411,805	374,700
Accumulated other comprehensive gain (loss)	29,165	(9,340)
Treasury stock, at cost (808,123 and 812,346 shares, respectively)	(17,683)	(17,776)
Total shareholders' equity	774,583	607,258
Total liabilities and shareholders' equity	$ 6,488,275	$ 5,444,506