ALLOWANCE FOR LOAN LOSSES: (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Allowance for Loan Losses:
Beginning balance	$ 18,839		$ 20,068		$ 21,958
Provision for loan losses	4,700	[1]	4,385	[2]	6,475	[3]
Loans charged -off	(8,528)		(9,450)		(13,387)
Recoveries	4,935		3,836		5,022
Ending Balance	19,946		18,839		20,068
Increase in provision for decrease in FDIC indemnification asset			687		1,400
Commercial
Allowance for Loan Losses:
Beginning balance	10,915		12,450		10,987
Provision for loan losses	990	[1]	1,053	[2]	3,144	[3]
Loans charged -off	(2,852)		(3,522)		(4,830)
Recoveries	2,429		934		3,149
Ending Balance	11,482		10,915		12,450
Residential
Allowance for Loan Losses:
Beginning balance	1,374		1,585		5,426
Provision for loan losses	874	[1]	134	[2]	629	[3]
Loans charged -off	(866)		(1,143)		(4,942)
Recoveries	452		798		472
Ending Balance	1,834		1,374		1,585
Consumer
Allowance for Loan Losses:
Beginning balance	4,370		3,650		3,879
Provision for loan losses	3,331	[1]	3,401	[2]	1,985	[3]
Loans charged -off	(4,810)		(4,785)		(3,615)
Recoveries	2,054		2,104		1,401
Ending Balance	4,945		4,370		3,650
Unallocated
Allowance for Loan Losses:
Beginning balance	2,180		2,383		1,666
Provision for loan losses	(495)	[1]	(203)	[2]	717	[3]
Loans charged -off	0		0		0
Recoveries	0		0		0
Ending Balance	$ 1,685		$ 2,180		$ 2,383

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjgwZDk3YjYxY2UyYzQ5NjE5ZjEyOTk3NDc5NzNiYjJkfFRleHRTZWxlY3Rpb246RUNGN0YyMTZEQUUxMEZEMDk0RTUxRDc1NkRGQ0IxQUIM}

[2] Provision before increase of $687 thousand in 2014 for decrease in FDIC indemnification asset

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