ALLOWANCE FOR LOAN LOSSES: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for Loan Losses:
Beginning balance	$ 21,958		$ 19,241		$ 22,336
Provision for loan losses	6,475	[1]	11,000	[2]	5,880	[3]
Loans charged -off	(13,387)		(10,414)		(11,116)
Recoveries	5,022		2,131		2,141
Ending Balance	20,068		21,958		19,241
Increase in provision for decrease in FDIC indemnification asset	1,400		2,200		125
Commercial
Allowance for Loan Losses:
Beginning balance	10,987		12,119		12,809
Provision for loan losses	3,144	[1]	2,400	[2]	3,708	[3]
Loans charged -off	(4,830)		(4,176)		(5,336)
Recoveries	3,149		644		938
Ending Balance	12,450		10,987		12,119
Residential
Allowance for Loan Losses:
Beginning balance	5,426		2,728		2,873
Provision for loan losses	629	[1]	5,196	[2]	2,571	[3]
Loans charged -off	(4,942)		(2,598)		(2,811)
Recoveries	472		100		95
Ending Balance	1,585		5,426		2,728
Consumer
Allowance for Loan Losses:
Beginning balance	3,879		3,889		4,551
Provision for loan losses	1,985	[1]	2,243	[2]	1,199	[3]
Loans charged -off	(3,615)		(3,640)		(2,969)
Recoveries	1,401		1,387		1,108
Ending Balance	3,650		3,879		3,889
Unallocated
Allowance for Loan Losses:
Beginning balance	1,666		505		2,103
Provision for loan losses	717	[1]	1,161	[2]	(1,598)	[3]
Loans charged -off	0		0		0
Recoveries	0		0		0
Ending Balance	$ 2,383		$ 1,666		$ 505

[1] Provision before increase of $1.4 million in 2013 for decrease in FDIC indemnification asset

[2] Provision before decrease of $2.2 million in 2012 for increase in FDIC indemnification asset

[3] Provision before decrease of $125 thousand in 2011 for increase in FDIC indemnification asset