Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 50,585	$ 42,474
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	7,094	7,303
Impairment of premises and equipment		807
Provision for loan losses	12,000	22,900
Deferred tax benefit	(4,921)	(5,848)
Increase in cash surrender value of Bank-owned life insurance	(3,895)	(3,998)
Net amortization of premiums and discounts on securities	12,115	8,505
Accretion of net deferred loan fees	(2,603)	(1,660)
Amortization of premiums on purchased loans, net	1,272	1,332
Net increase in loans originated for sale	(32,826)	(6,984)
Proceeds from sales of loans originated for sale	34,581	7,111
Proceeds from sales of foreclosed assets	13,465	5,761
ESOP expense	1,811	1,685
Allocation of stock award shares	3,246	2,510
Allocation of stock options	216	572
Net gain on sale of loans	(1,753)	(127)
Net gain on securities transactions	(2,482)	(686)
Impairment charge on securities		302
Net gain on sale of premises and equipment	(32)	(43)
Net loss (gain) on sale of foreclosed assets	227	(27)
Decrease in accrued interest receivable	2,063	2,196
Increase in other assets	(6,343)	(10,722)
Decrease in other liabilities	(195)	(3,727)
Net cash provided by operating activities	83,625	69,636
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of investment securities held to maturity	61,882	44,392
Purchases of investment securities held to maturity	(66,579)	(50,160)
Proceeds from sales of securities available for sale	51,090	23,504
Proceeds from maturities and paydowns of securities available for sale	353,493	298,422
Purchases of securities available for sale	(368,859)	(247,883)
Cash consideration paid to acquire Beacon Trust, net of cash and cash equivalents		(7,254)
Purchases of loans	(115,428)	(68,981)
Net increase in loans	(63,404)	(98,761)
Proceeds from sales of premises and equipment	65	1,952
Purchases of premises and equipment	(6,410)	(8,751)
Net cash used in by investing activities	(154,150)	(113,520)
Cash flows from financing activities:
Net increase in deposits	217,080	196,558
Increase in mortgage escrow deposits	385	788
Purchase of treasury stock	(5,620)	(2,875)
Cash dividends paid to stockholders	(23,081)	(21,159)
Shares issued dividend reinvestment plan	5,424	(533)
Stock options exercised	18	9
Proceeds from long-term borrowings		236,300
Payments on long-term borrowings	(26,197)	(252,328)
Net decrease in short-term borrowings	(59,563)	(41,089)
Net cash provided by financing activities	108,446	115,671
Net increase in cash and cash equivalents	37,921	71,787
Cash and cash equivalents at beginning of period	69,632	52,229
Cash and cash equivalents at end of period	107,553	124,016
Cash paid during the period for:
Interest on deposits and borrowings	34,854	47,196
Income taxes	20,318	20,122
Non cash investing activities:
Transfer of loans receivable to foreclosed assets	14,813	9,664
Fair value of assets acquired	672	1,879
Goodwill and customer relationship intangible	(672)	9,547
Liabilities assumed		$ 926