SECURITIES: (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amortized cost and fair value of investments classified as available for sale
TOTAL	$ 920,897	$ 668,615
Unrealized Gains	20,347	30,619
Unrealized Losses	(26,684)	(8,234)
Securities available-for-sale	914,560	691,000
U.S. Government entity mortgage-backed securities
Amortized cost and fair value of investments classified as available for sale
TOTAL	1,623	1,807
Unrealized Gains	10	79
Unrealized Losses	0	0
Securities available-for-sale	1,633	1,886
Mortgage-backed securities, residential
Amortized cost and fair value of investments classified as available for sale
TOTAL	191,995	231,316
Unrealized Gains	7,761	13,373
Unrealized Losses	(1,992)	(13)
Securities available-for-sale	197,764	244,676
Mortgage-backed securities, commercial
Amortized cost and fair value of investments classified as available for sale
TOTAL	4,642	5,146
Unrealized Gains	1	1
Unrealized Losses	(252)	(16)
Securities available-for-sale	4,391	5,131
Collateralized mortgage obligations
Amortized cost and fair value of investments classified as available for sale
TOTAL	521,148	230,739
Unrealized Gains	1,492	2,827
Unrealized Losses	(15,899)	(246)
Securities available-for-sale	506,741	233,320
State and municipal obligations
Amortized cost and fair value of investments classified as available for sale
TOTAL	190,521	187,044
Unrealized Gains	6,388	12,518
Unrealized Losses	(1,922)	(77)
Securities available-for-sale	194,987	199,485
Collateralized debt obligations
Amortized cost and fair value of investments classified as available for sale
TOTAL	10,968	12,243
Unrealized Gains	4,695	1,761
Unrealized Losses	(6,619)	(7,882)
Securities available-for-sale	9,044	6,122
Equity Securities
Amortized cost and fair value of investments classified as available for sale
TOTAL		320
Unrealized Gains		60
Unrealized Losses		0
Securities available-for-sale	$ 0	$ 380