FAIR VALUE ACCOUNTING AND MEASUREMENT (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets:
Securities—trading, Fair Value	$ 32,404	$ 40,258
Securities—available-for-sale	387,876	411,021
Securities—held-to-maturity	137,267	137,608
Liabilities:
FHLB advances at fair value	236	32,250
Carrying Value
Assets:
Cash and cash equivalents	183,974	126,072
Securities—trading, Fair Value	32,404	40,258
Securities—available-for-sale	387,876	411,021
Securities—held-to-maturity	132,197	131,258
Loans receivable held for sale	1,154	2,786
Loans receivable	4,245,322	3,831,034
FHLB stock	6,120	27,036
Bank-owned life insurance	71,744	63,759
Mortgage servicing rights	12,329	9,030
Liabilities:
Demand, interest checking and money market accounts	2,528,176	2,227,292
Regular savings	1,003,189	901,142
Certificates of deposit	765,780	770,516
FHLB advances at fair value	236	32,250
Junior subordinated debentures at fair value	84,694	78,001
Other borrowings	94,523	77,185
Estimated Fair Value
Assets:
Cash and cash equivalents	183,974	126,072
Securities—trading, Fair Value	32,404	40,258
Securities—available-for-sale	387,876	411,021
Securities—held-to-maturity	137,267	137,608
Loans receivable held for sale	1,179	2,807
Loans receivable	4,114,079	3,722,179
FHLB stock	6,120	27,036
Bank-owned life insurance	71,744	63,759
Mortgage servicing rights	16,402	12,987
Liabilities:
Demand, interest checking and money market accounts	2,249,076	1,998,649
Regular savings	866,788	784,006
Certificates of deposit	760,167	764,549
FHLB advances at fair value	236	32,250
Junior subordinated debentures at fair value	84,694	78,001
Other borrowings	94,523	77,185
Interest Rate Lock Commitments [Member] | Carrying Value
Assets:
Derivatives:	754	317
Interest Rate Lock Commitments [Member] | Estimated Fair Value
Assets:
Derivatives:	754	317
Interest rate swaps [Member] | Carrying Value
Assets:
Derivatives:	6,627	6,290
Liabilities:
Derivatives:	6,627	6,290
Interest rate swaps [Member] | Estimated Fair Value
Assets:
Derivatives:	6,627	6,290
Liabilities:
Derivatives:	6,627	6,290
Interest Rate Forward Sales Commitments [Member] | Carrying Value
Liabilities:
Derivatives:	148	198
Interest Rate Forward Sales Commitments [Member] | Estimated Fair Value
Liabilities:
Derivatives:	$ 148	$ 198