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SECURITIES AVAILABLE FOR SALE AND HELD TO MATURITY (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Securities available for sale:
Amortized Cost	$ 1,054,984	$ 769,342
Gross Unrealized Gains	14,320	8,005
Gross Unrealized Losses	(10,249)	(17,299)
Fair Value	1,058,965	760,048
Securities held to maturity
Amortized Cost	42,596	44,921
Gross Unrealized Gains	1,388	1,257
Gross Unrealized Losses	(213)	(414)
Fair Value	43,771	45,764
Securities
Total Amortized Cost	1,097,580	814,263
Total Gross Unrealized Gains	15,618	9,262
Total Gross Unrealized Losses	(10,462)	(17,713)
Total Fair Value	1,102,736	805,812
Debt securities
Securities available for sale:
Amortized Cost	1,005,991	749,300
Gross Unrealized Gains	10,546	5,739
Gross Unrealized Losses	(8,052)	(16,964)
Fair Value	1,008,485	738,075
Debt securities | Municipal bonds and obligations
Securities available for sale:
Amortized Cost	129,981	77,852
Gross Unrealized Gains	5,781	1,789
Gross Unrealized Losses	(238)	(1,970)
Fair Value	135,524	77,671
Securities held to maturity
Amortized Cost	4,004	4,244
Fair Value	4,004	4,244
Debt securities | Government guaranteed residential mortgage-backed securities
Securities available for sale:
Amortized Cost	74,127	78,885
Gross Unrealized Gains	490	544
Gross Unrealized Losses	(335)	(658)
Fair Value	74,282	78,771
Debt securities | Government-sponsored residential mortgage-backed securities
Securities available for sale:
Amortized Cost	780,475	531,441
Gross Unrealized Gains	3,401	2,000
Gross Unrealized Losses	(6,305)	(10,783)
Fair Value	777,571	522,658
Securities held to maturity
Amortized Cost	71	73
Gross Unrealized Gains	3	2
Fair Value	74	75
Debt securities | Corporate bonds
Securities available for sale:
Amortized Cost	2,556	40,945
Gross Unrealized Gains		157
Gross Unrealized Losses		(1,822)
Fair Value	2,556	39,280
Debt securities | Trust preferred securities
Securities available for sale:
Amortized Cost	15,620	16,927
Gross Unrealized Gains	874	1,249
Gross Unrealized Losses	(1,096)	(1,565)
Fair Value	15,398	16,611
Debt securities | Tax advantaged economic development bonds
Securities held to maturity
Amortized Cost	38,189	40,260
Gross Unrealized Gains	1,385	1,255
Gross Unrealized Losses	(213)	(414)
Fair Value	39,361	41,101
Debt securities | Other bonds and obligations
Securities available for sale:
Amortized Cost	3,232	3,250
Gross Unrealized Losses	(78)	(166)
Fair Value	3,154	3,084
Securities held to maturity
Amortized Cost	332	344
Fair Value	332	344
Marketable equity securities
Securities available for sale:
Amortized Cost	48,993	20,042
Gross Unrealized Gains	3,684	2,266
Gross Unrealized Losses	(2,197)	(335)
Fair Value	$ 50,480	$ 21,973

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