CASH AND SECURITIES (Schedule of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Interest-bearing deposits included in cash and due from banks	$ 67,638	$ 114,928
Interest-bearing deposits and marketable securities	738,293	782,237
Total securities [Member]
Schedule of Investments [Line Items]
Marketable securities	635,265	630,604
U.S. Government and agency obligations [Member]
Schedule of Investments [Line Items]
Marketable securities	61,327	98,617
Total municipal bonds [Member]
Schedule of Investments [Line Items]
Marketable securities	153,804	135,025
Taxable municipal bonds [Member]
Schedule of Investments [Line Items]
Marketable securities	34,216	31,480
Tax exempt municipal bonds [Member]
Schedule of Investments [Line Items]
Marketable securities	119,588	103,545
Corporate bonds [Member]
Schedule of Investments [Line Items]
Marketable securities	44,154	48,519
Total Mortgage-backed or related securities [Member]
Schedule of Investments [Line Items]
Marketable securities	350,721	305,864
1-4 residential agency guaranteed [Member]
Schedule of Investments [Line Items]
Marketable securities	58,117	105,770
1-4 residential other [Member]
Schedule of Investments [Line Items]
Marketable securities	1,051	1,299
Multifamily agency guaranteed [Member]
Schedule of Investments [Line Items]
Marketable securities	281,319	188,136
Multifamily other [Member]
Schedule of Investments [Line Items]
Marketable securities	10,234	10,659
Asset-backed securities [Member]
Schedule of Investments [Line Items]
Marketable securities	25,191	42,516
Student Loan Marketing Association SLMA [Member]
Schedule of Investments [Line Items]
Marketable securities	15,681	32,474
Other Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Marketable securities	9,510	10,042
Equity securities (excludes FHLB stock) [Member]
Schedule of Investments [Line Items]
Marketable securities	68	63
FHLB stock [Member]
Schedule of Investments [Line Items]
Marketable securities	$ 35,390	$ 36,705