FAIR VALUE ACCOUNTING AND MEASUREMENT (Fair Value By Balance Sheet Location) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Assets:
Securities - trading	$ 72,593,000	$ 80,727,000
Securities - available-for-sale	459,958,000	465,795,000
Securities - held-to-maturity	95,176,000	80,107,000
Carrying Value
Assets:
Cash and due from banks	203,756,000	132,436,000
Securities - trading	72,593,000	80,727,000
Securities - available-for-sale	459,958,000	465,795,000
Securities - held-to-maturity	88,626,000	75,438,000
Loans receivable held for sale	6,898,000	3,007,000
Loans receivable	3,206,625,000	3,293,331,000
FHLB stock	37,038,000	37,371,000
Bank-owned life insurance	60,395,000	58,563,000
Mortgage servicing rights	6,451,000	5,584,000
Derivatives	10,090,000	6,284,000
Liabilities:
Demand NOW, and money market accounts	1,709,874,000	1,555,561,000
Regualr savings	689,322,000	669,596,000
Certificates of deposit	1,087,176,000	1,250,497,000
FHLB advances at fair value	10,367,000	10,533,000
Junior subordinated debentures at fair value	73,071,000	49,988,000
Other borrowings	82,275,000	152,128,000
Derivatives	9,915,000	6,283,000
Carrying Value | Commitments to originate loans [Member]
Liabilities:
Off-balance-sheet financial instruments	1,255,000	617,000
Carrying Value | Commitments to sell loans [Member]
Liabilities:
Off-balance-sheet financial instruments	(1,081,000)	(617,000)
Estimated Fair Value
Assets:
Cash and due from banks	203,756,000	132,436,000
Securities - trading	72,593,000	80,727,000
Securities - available-for-sale	459,958,000	465,795,000
Securities - held-to-maturity	95,176,000	80,107,000
Loans receivable held for sale	6,960,000	3,069,000
Loans receivable	3,131,598,000	3,224,112,000
FHLB stock	37,038,000	37,371,000
Bank-owned life insurance	60,395,000	58,563,000
Mortgage servicing rights	6,451,000	5,584,000
Derivatives	10,090,000	6,284,000
Liabilities:
Demand NOW, and money market accounts	1,646,377,000	1,487,080,000
Regualr savings	659,117,000	630,450,000
Certificates of deposit	1,092,828,000	1,258,431,000
FHLB advances at fair value	10,367,000	10,533,000
Junior subordinated debentures at fair value	73,071,000	49,988,000
Other borrowings	82,275,000	152,128,000
Derivatives	9,915,000	6,283,000
Estimated Fair Value | Commitments to originate loans [Member]
Liabilities:
Off-balance-sheet financial instruments	1,255,000	617,000
Estimated Fair Value | Commitments to sell loans [Member]
Liabilities:
Off-balance-sheet financial instruments	$ (1,081,000)	$ (617,000)