FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Carrying amount and estimated fair value of financial instruments
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 14,050	$ 14,079	$ 14,983	$ 15,180
Securities available-for-sale	897,053us-gaap_AvailableForSaleSecurities	914,560us-gaap_AvailableForSaleSecurities
Restricted Stock	16,404us-gaap_RestrictedInvestments	21,057us-gaap_RestrictedInvestments
FDIC Indemnification Asset	(74)us-gaap_FDICIndemnificationAsset	1,055us-gaap_FDICIndemnificationAsset	2,632us-gaap_FDICIndemnificationAsset
Accrued interest receivable	11,593us-gaap_InterestReceivable	11,554us-gaap_InterestReceivable
Deposits	(2,457,197)us-gaap_Deposits	(2,458,791)us-gaap_Deposits
Level 1
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	22,597	22,455
Securities available-for-sale	0	0
Level 2
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	55,505	48,578
Federal funds sold	8,000	4,276
Securities available-for-sale	875,850	900,991
FDIC Indemnification Asset	(74)	1,055
Accrued interest receivable	3,183	3,279
Deposits	(2,459,703)	(2,463,330)
Short-term borrowings	(48,015)	(59,592)
Federal Home Loan Bank advances	(13,605)	(60,258)
Accrued interest payable	(456)	(750)
Level 3
Carrying amount and estimated fair value of financial instruments
Securities available-for-sale	21,203	13,569
Loans, net	1,810,885	1,816,726
Accrued interest receivable	8,410	8,275
Reported Value Measurement [Member]
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	78,102	71,033
Federal funds sold	8,000	4,276
Securities available-for-sale	897,053	914,560
Restricted Stock	16,404	21,057
Loans, net	1,762,589	1,771,360
FDIC Indemnification Asset	(74)	1,055
Accrued interest receivable	11,593	11,554
Deposits	(2,457,197)	(2,458,791)
Short-term borrowings	(48,015)	(59,592)
Federal Home Loan Bank advances	(12,886)	(58,288)
Accrued interest payable	(456)	(750)
Estimate of Fair Value Measurement [Member]
Carrying amount and estimated fair value of financial instruments
Cash and due from banks	78,102	71,033
Federal funds sold	8,000	4,276
Securities available-for-sale	897,053	914,560
Loans, net	1,810,885	1,816,726
FDIC Indemnification Asset	(74)	1,055
Accrued interest receivable	11,593	11,554
Deposits	(2,459,703)	(2,463,330)
Short-term borrowings	(48,015)	(59,592)
Federal Home Loan Bank advances	(13,605)	(60,258)
Accrued interest payable	$ (456)	$ (750)

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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