Consolidated Statements of Financial Condition (Current Period Unaudited) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Assets [Abstract]
Cash and due from banks		$ 125,279	$ 117,315
Interest-bearing deposits in other banks		822,264	488,947
Trading securities, at fair value		17,038	17,460
Securities available-for-sale, at fair value		1,151,418	1,187,009
Securities held-to-maturity, at amortized cost		23,723	26,555
Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) stock, at cost		38,748	37,558
Loans, excluding covered loans		6,874,480	6,657,418
Covered loans	[1]	51,219	79,435
Allowance for loan and covered loan losses		(72,500)	(72,694)
Net loans		6,853,199	6,664,159
Other real estate owned (OREO), excluding covered OREO		31,129	26,898
Covered OREO		906	8,068
Federal Deposit Insurance Corporation (FDIC) indemnification asset		6,106	8,452
Premises, furniture, and equipment, net		127,443	131,109
Investment in bank-owned life insurance (BOLI)		208,666	206,498
Goodwill and other intangible assets		331,250	334,199
Accrued interest receivable and other assets		197,877	190,912
Total assets		9,935,046	9,445,139
Liabilities
Noninterest-bearing deposits		2,671,793	2,301,757
Interest-bearing deposits		5,624,657	5,586,001
Total deposits		8,296,450	7,887,758
Borrowed funds		169,943	137,994
Senior and subordinated debt		201,123	200,869
Accrued interest payable and other liabilities		119,861	117,743
Total liabilities		8,787,377	8,344,364
Stockholders' Equity
Common stock		882	882
Additional paid-in capital		445,037	449,798
Retained earnings		944,209	899,516
Accumulated other comprehensive loss, net of tax		(15,818)	(15,855)
Treasury stock, at cost		(226,641)	(233,566)
Total stockholders' equity		1,147,669	1,100,775
Total liabilities and stockholders' equity		$ 9,935,046	$ 9,445,139
Share Data
Par Value (in Dollars per share)		$ 0.01	$ 0.01
Shares authorized, preferred stock (in Shares)		1,000,000	1,000,000
Shares authorized (in Shares)		150,000,000	150,000,000
Shares issued (in Shares)		88,228,000	88,228,000
Shares outstanding (in Shares)		77,942,000	77,695,000
Treasury shares (in Shares)		10,286,000	10,533,000

[1] For information on covered loans, see Note 6, "Acquired and Covered Loans."