REGULATORY CAPITAL REQUIREMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Company (consolidated) [Member]
Total capital (to risk weighted assets):
Actual	$ 747,372	$ 666,898
Actual Ratio	13.36%	13.15%
Capital Required for Capital Adequacy	$ 447,664	$ 405,650
For Capital Adequacy Purposes Ratio	8.00%	8.00%
Common Equity Tier One Capital	$ 584,378
Common Equity tier One Capital to Risk Weighted Assets	10.44%
Common Equity Tier One Capital Required for Capital Adequacy	$ 251,811
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 655,154	$ 551,836
Actual Ratio	11.71%	10.88%
For Capital Adequacy Purposes	$ 335,748	$ 202,825
For Capital Adequacy Purposes Ratio	6.00%	4.00%
Tier 1 capital (to average assets):
Actual	$ 655,154	$ 551,836
Actual Ratio	9.33%	8.84%
For Capital Adequacy Purposes	$ 280,889	$ 249,825
For Capital Adequacy Purposes Ratio	4.00%	4.00%
Bank [Member]
Total capital (to risk weighted assets):
Actual	$ 718,197	$ 607,100
Actual Ratio	12.84%	11.98%
Capital Required for Capital Adequacy	$ 447,334	$ 405,465
For Capital Adequacy Purposes Ratio	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 559,167	$ 506,831
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Common Equity Tier One Capital	$ 660,979
Common Equity tier One Capital to Risk Weighted Assets	11.82%
Common Equity Tier One Capital Required for Capital Adequacy	$ 251,625
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%
Common Equity Tier 1 Capital to be Well Capitalized	$ 363,459
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets	6.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 660,979	$ 527,038
Actual Ratio	11.82%	10.40%
For Capital Adequacy Purposes	$ 335,500	$ 202,732
For Capital Adequacy Purposes Ratio	6.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 447,334	$ 304,099
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	6.00%
Tier 1 capital (to average assets):
Actual	$ 660,979	$ 527,038
Actual Ratio	9.42%	8.44%
For Capital Adequacy Purposes	$ 280,653	$ 249,788
For Capital Adequacy Purposes Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Correction Action Provisions	$ 350,816	$ 312,235
To Be Well Capitalized Under Prompt Correction Action Provisions Ratio	5.00%	5.00%