INVESTMENT SECURITIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Held-to-Maturity Securities: [Abstract]
Amortized Cost of Held-to-maturity Securities	$ 44,167,000	$ 62,085,000
Gross Unrealized Gains on Held-to-maturity Securities	2,791,000	3,992,000
Gross Unrealized Loss on Held-to-maturity Securities	0	0
Fair Value of Held-to-maturity Securities	46,958,000	66,077,000
Available-for-Sale Securities: [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	779,757,000	855,268,000
Available-for-sale Securities, Gross Unrealized Gains	38,998,000	39,352,000
Available-for-sale Securities, Gross Unrealized Losses	(1,321,000)	(664,000)
Available-for-sale Securities, Total	817,434,000	893,956,000
Investment securities pledged as collateral	245,365,000	290,658,000
Securities With Unrealized Losses [Abstract]
Less than twelve months temporarily impaired Fair Value	105,439,000	72,533,000
Less than twelve months temporarily impaired Unrealized Loss	(1,159,000)	(664,000)
12 Months or More temporarily impaired Fair Value	6,170,000	0
12 Months or More temporarily impaired Unrealized Loss	(162,000)	0
Total temporarily impaired Fair Value	111,609,000	72,533,000
Total temporarily impaired Unrealized Loss	(1,321,000)	(664,000)
Sales of Available-for-Sale Securities [Abstract]
Proceeds	102,687,000	4,610,000	78,504,000
Gains	4,248,000	138,000	1,885,000
Losses	(635,000)	0	(166,000)
Net gains	3,613,000	138,000	1,719,000
Tax provision related to the net realized gain on the sale of available for sale securities	1,434,000	55,000	682,000
Held-to-maturity Securities Amortized Cost [Abstract]
Held-to-maturity Amortized Cost Securities Within one year	5,840,000
Held-to-maturity Amortized Cost Securities After 1 through 5 years	11,487,000
Held-to-maturity Amortized Cost Securities After 5 through 10 years	16,601,000
Held-to-maturity Amortized Cost Securities After 10 years	2,327,000
Held-to-maturity Amortized Cost Securities Mortgage-backed securities	7,912,000
Total Held-to-maturity Amortized Cost Securities	44,167,000
Held-to-maturity Securities Fair Value [Abstract]
Held-to-maturity Fair Value Securities Within one year	5,967,000
Held-to-maturity Fair Value After 1 through 5 years	12,116,000
Held-to-maturity Fair Value After 5 through 10 years	17,838,000
Held-to-maturity Fair Value After 10 years	2,516,000
Held-to-maturity Fair Value Mortgage-backed securities	8,521,000
Total Held-to-maturity Fair Value	46,958,000
Available-for-Sale Securities Amortized Cost [Abstract]
Available-for-Sale Securities Amortized Cost Within one year	3,742,000
Available-for-Sale Securities Amortized Cost After 1 through 5 years	12,954,000
Available-for-Sale Securities Amortized Cost After 5 through 10 years	32,945,000
Available-for-Sale Securities Amortized Cost After 10 years	258,317,000
Available-for-Sale Securities Amortized Cost Mortgage-backed securities	471,799,000
Total Available-for-Sale Securities Amortized Cost	779,757,000
Available-for-Sale Securities Fair Value [Abstract]
Available-for-Sale Securities Fair Value Within one year	3,820,000
Available-for-Sale Securities Fair Value After 1 through 5 years	13,786,000
Available-for-Sale Securities Fair Value After 5 through 10 years	34,590,000
Available-for-Sale Securities Fair Value After 10 years	280,317,000
Available-for-Sale Securities Fair Value Mortgage-backed securities	484,921,000
Available-for-sale Securities, Total	817,434,000	893,956,000
U.S. Government Agencies [Member]
Available-for-Sale Securities: [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total		5,000,000
Available-for-sale Securities, Gross Unrealized Gains		113,000
Available-for-sale Securities, Gross Unrealized Losses		0
Available-for-sale Securities, Total		5,113,000
Holdings of securities as percentage of share holders equity (in hundredths)	10.00%	10.00%
Available-for-Sale Securities Fair Value [Abstract]
Available-for-sale Securities, Total		5,113,000
State and Municipals [Member]
Available-for-Sale Securities: [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	307,958,000	292,662,000
Available-for-sale Securities, Gross Unrealized Gains	24,703,000	20,580,000
Available-for-sale Securities, Gross Unrealized Losses	(148,000)	(47,000)
Available-for-sale Securities, Total	332,513,000	313,195,000
Securities With Unrealized Losses [Abstract]
Less than twelve months temporarily impaired Fair Value	12,765,000	6,176,000
Less than twelve months temporarily impaired Unrealized Loss	(148,000)	(47,000)
12 Months or More temporarily impaired Fair Value	0	0
12 Months or More temporarily impaired Unrealized Loss	0	0
Total temporarily impaired Fair Value	12,765,000	6,176,000
Total temporarily impaired Unrealized Loss	(148,000)	(47,000)
Available-for-Sale Securities Fair Value [Abstract]
Available-for-sale Securities, Total	332,513,000	313,195,000
Pass-Through Mortgage Securities [Member]
Available-for-Sale Securities: [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	82,863,000	68,060,000
Available-for-sale Securities, Gross Unrealized Gains	2,093,000	5,726,000
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Total	84,956,000	73,786,000
Available-for-Sale Securities Fair Value [Abstract]
Available-for-sale Securities, Total	84,956,000	73,786,000
Collateralized Mortgage Obligations [Member]
Available-for-Sale Securities: [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	388,936,000	489,546,000
Available-for-sale Securities, Gross Unrealized Gains	12,202,000	12,933,000
Available-for-sale Securities, Gross Unrealized Losses	(1,173,000)	(617,000)
Available-for-sale Securities, Total	399,965,000	501,862,000
Securities With Unrealized Losses [Abstract]
Less than twelve months temporarily impaired Fair Value	92,674,000	66,357,000
Less than twelve months temporarily impaired Unrealized Loss	(1,011,000)	(617,000)
12 Months or More temporarily impaired Fair Value	6,170,000	0
12 Months or More temporarily impaired Unrealized Loss	(162,000)	0
Total temporarily impaired Fair Value	98,844,000	66,357,000
Total temporarily impaired Unrealized Loss	(1,173,000)	(617,000)
Available-for-Sale Securities Fair Value [Abstract]
Available-for-sale Securities, Total	399,965,000	501,862,000
State and Municipals [Member]
Held-to-Maturity Securities: [Abstract]
Amortized Cost of Held-to-maturity Securities	36,255,000	43,091,000
Gross Unrealized Gains on Held-to-maturity Securities	2,182,000	2,906,000
Gross Unrealized Loss on Held-to-maturity Securities	0	0
Fair Value of Held-to-maturity Securities	38,437,000	45,997,000
Pass-Through Mortgage Securities [Member]
Held-to-Maturity Securities: [Abstract]
Amortized Cost of Held-to-maturity Securities	3,782,000	6,851,000
Gross Unrealized Gains on Held-to-maturity Securities	342,000	551,000
Gross Unrealized Loss on Held-to-maturity Securities	0	0
Fair Value of Held-to-maturity Securities	4,124,000	7,402,000
Collateralized Mortgage Obligations [Member]
Held-to-Maturity Securities: [Abstract]
Amortized Cost of Held-to-maturity Securities	4,130,000	12,143,000
Gross Unrealized Gains on Held-to-maturity Securities	267,000	535,000
Gross Unrealized Loss on Held-to-maturity Securities	0	0
Fair Value of Held-to-maturity Securities	$ 4,397,000	$ 12,678,000