FAIR VALUE ACCOUNTING AND MEASUREMENT (Fair Value By Balance Sheet Location) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Assets:
Securities - trading	$ 67,761,000	$ 71,232,000
Securities - available-for-sale	476,683,000	472,920,000
Securities - held-to-maturity	93,785,000	92,458,000
Carrying Value
Assets:
Cash and due from banks	155,714,000	181,298,000
Securities - trading	67,761,000	71,232,000
Securities - available-for-sale	476,683,000	472,920,000
Securities - held-to-maturity	88,408,000	86,452,000
Loans receivable held for sale	5,384,000	11,920,000
Loans receivable	3,234,937,000	3,223,794,000
FHLB stock	36,373,000	36,705,000
Bank-owned life insurance	60,425,000	59,891,000
MSRs	6,335,000	6,244,000
Derivatives	8,157,000	8,863,000
Liabilities:
Demand NOW, and money market accounts	1,777,815,000	1,800,555,000
Regualr savings	759,866,000	727,956,000
Certificates of deposit	982,903,000	1,029,293,000
FHLB advances at fair value	278,000	10,304,000
Junior subordinated debentures at fair value	73,220,000	73,063,000
Other borrowings	88,446,000	76,633,000
Derivatives	7,835,000	8,548,000
Carrying Value | Commitments to originate loans [Member]
Liabilities:
Off-balance-sheet financial instruments	710,000	510,000
Carrying Value | Commitments to sell loans [Member]
Liabilities:
Off-balance-sheet financial instruments	388,000	(195,000)
Estimated Fair Value
Assets:
Cash and due from banks	155,714,000	181,298,000
Securities - trading	67,761,000	71,232,000
Securities - available-for-sale	476,683,000	472,920,000
Securities - held-to-maturity	93,785,000	92,458,000
Loans receivable held for sale	5,438,000	12,059,000
Loans receivable	3,163,536,000	3,143,853,000
FHLB stock	36,373,000	36,705,000
Bank-owned life insurance	60,425,000	59,891,000
MSRs	6,335,000	6,244,000
Derivatives	8,157,000	8,863,000
Liabilities:
Demand NOW, and money market accounts	1,660,687,000	1,729,351,000
Regualr savings	703,054,000	694,609,000
Certificates of deposit	977,609,000	1,033,931,000
FHLB advances at fair value	278,000	10,304,000
Junior subordinated debentures at fair value	73,220,000	73,063,000
Other borrowings	88,446,000	76,633,000
Derivatives	7,835,000	8,548,000
Estimated Fair Value | Commitments to originate loans [Member]
Liabilities:
Off-balance-sheet financial instruments	710,000	510,000
Estimated Fair Value | Commitments to sell loans [Member]
Liabilities:
Off-balance-sheet financial instruments	$ 388,000	$ (195,000)