CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net Income	$ 66,739	$ 63,560	$ 64,151
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	18,519	26,338	34,170
Net (gain)/ loss on sale of assets	(6,061)	(2,894)	2,999
Net depreciation, amortization and accretion	8,952	9,466	7,790
Decrease in other assets	12,351	18,695	7,534
Increase/(decrease) in other liabilities	2,890	11,351	(24,967)
Net amortization/ (accretion) of premium on marketable securities	298	(76)	(186)
Noncash compensation expense related to stock benefit plans	5,083	4,623	6,725
Noncash impairment losses on investment securities	713	331	937
Noncash impairment of real estate owned	4,158	4,942	1,449
Deferred income tax expense	1,423	3,295	7,749
Origination of loans held for sale	(36,773)	(248,658)	(77,887)
Proceeds from sale of loans held for sale	52,550	236,482	88,238
Net cash provided by operating activities	130,842	127,455	118,702
Investing activities:
Purchase of marketable securities available-for-sale	(234,965)	(508,553)	(237,058)
Proceeds from maturities and principal reductions of marketable securities held-to-maturity	33,764	76,257	126,012
Proceeds from maturities and principal reductions of marketable securities available-for-sale	255,064	341,287	297,348
Proceeds from sale of marketable securities available-for-sale	16,003
Loan originations	(2,072,797)	(2,088,565)	(1,850,368)
Proceeds from loan maturities and principal reductions	1,924,179	1,911,871	1,766,191
Redemptions of Federal Home Loan Bank stock	3,119	2,101	11,145
Proceeds from sale of real estate owned	18,036	14,049	10,648
Sale/ (purchase) of real estate owned for investment, net	814	457	(22)
Purchase of premises and equipment	(19,367)	(18,255)	(12,434)
Acquisitions, net of cash received		(4,089)
Net cash (used in)/ provided by investing activities	(76,150)	(273,440)	111,462
Financing activities:
(Decrease)/ increase in deposits, net	(95,721)	(15,725)	15,989
Proceeds from long-term borrowings	30,000
Repayments of long-term borrowings	(68)	(69)	(50,066)
Net increase/ (decrease) in short-term borrowings	(8,334)	32,191	(13,302)
Increase/ (decrease) in advances by borrowers for taxes and insurance	3,344	(246)	703
Share repurchases	(4,459)	(52,028)	(172,690)
Cash dividends paid on common stock	(45,871)	(56,862)	(43,642)
Proceeds from stock options exercised	6,618	2,131	2,030
Net cash used in by financing activities	(114,491)	(90,608)	(260,978)
Net decrease in cash and cash equivalents	(59,799)	(236,593)	(30,814)
Cash and cash equivalents at beginning of period	451,704	688,297	719,111
Net decrease in cash and cash equivalents	(59,799)	(236,593)	(30,814)
Cash and cash equivalents at end of period	391,905	451,704	688,297
Cash and cash equivalents:
Cash and due from banks	98,122	88,277	94,276
Interest-earning deposits in other financial institutions	293,149	362,794	593,388
Federal funds sold and other short-term investments	634	633	633
Total cash and cash equivalents	391,905	451,704	688,297
Cash paid during the period for:
Interest on deposits and borrowings (including interest credited to deposit accounts of $26,329, $37,633 and $51,591, respectively)	61,162	75,415	93,413
Income taxes	22,881	14,278	23,916
Business acquisitions:
Fair value of assets acquired		4,152
Net cash paid		(4,089)
Liabilities assumed		63
Loan foreclosures and repossessions	14,529	20,080	20,410
Sale of real estate owned financed by the Company	$ 943	$ 461	$ 379