FAIR VALUE ACCOUNTING AND MEASUREMENT (Assets and Liabilities Measured at Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	$ 477,407	$ 472,920
Securities—trading, amortized cost $76,525 and $90,339, respectively	63,887	71,232
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Total assets	0	0
Advances from FHLB at faur valus	0	0
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	0	0
Total liabilities	0	0
Recurring [Member] | Level 1 [Member] | Interest rate lock commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Recurring [Member] | Level 1 [Member] | Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Recurring [Member] | Level 1 [Member] | U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 1 [Member] | Municipal bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 1 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Recurring [Member] | Level 1 [Member] | TPS and TRUP CDOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 1 [Member] | Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 1 [Member] | Equity securities and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	477,407	472,920
Securities—trading, amortized cost $76,525 and $90,339, respectively	28,792	35,491
Total assets	511,308	517,274
Advances from FHLB at faur valus	20,258	10,304
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	0	0
Total liabilities	25,347	18,852
Recurring [Member] | Level 2 [Member] | Interest rate lock commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	494	510
Derivative liabilities	474	195
Recurring [Member] | Level 2 [Member] | Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4,615	8,353
Derivative liabilities	4,615	8,353
Recurring [Member] | Level 2 [Member] | U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	58,768	96,980
Securities—trading, amortized cost $76,525 and $90,339, respectively	1,510	1,637
Recurring [Member] | Level 2 [Member] | Municipal bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	55,315	44,938
Securities—trading, amortized cost $76,525 and $90,339, respectively	4,987	5,684
Recurring [Member] | Level 2 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	9,000	10,729
Recurring [Member] | Level 2 [Member] | TPS and TRUP CDOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 2 [Member] | Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	329,075	277,757
Securities—trading, amortized cost $76,525 and $90,339, respectively	22,227	28,107
Recurring [Member] | Level 2 [Member] | Equity securities and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	68	63
Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	25,249	42,516
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	35,095	35,741
Total assets	35,095	35,741
Advances from FHLB at faur valus	0	0
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	73,637	73,063
Total liabilities	73,637	73,063
Recurring [Member] | Level 3 [Member] | Interest rate lock commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Recurring [Member] | Level 3 [Member] | Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Recurring [Member] | Level 3 [Member] | U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 3 [Member] | Municipal bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 3 [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Recurring [Member] | Level 3 [Member] | TPS and TRUP CDOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	35,095	35,741
Recurring [Member] | Level 3 [Member] | Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 3 [Member] | Equity securities and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	0	0
Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	0	0
Recurring [Member] | Total [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	477,407	472,920
Securities—trading, amortized cost $76,525 and $90,339, respectively	63,887	71,232
Total assets	546,403	553,015
Advances from FHLB at faur valus	20,258	10,304
Junior subordinated debentures net of unamortized deferred issuance costs at fair value	73,637	73,063
Total liabilities	98,984	91,915
Recurring [Member] | Total [Member] | Interest rate lock commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	494	510
Derivative liabilities	474	195
Recurring [Member] | Total [Member] | Interest rate swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4,615	8,353
Derivative liabilities	4,615	8,353
Recurring [Member] | Total [Member] | U.S. Government and agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	58,768	96,980
Securities—trading, amortized cost $76,525 and $90,339, respectively	1,510	1,637
Recurring [Member] | Total [Member] | Municipal bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	55,315	44,938
Securities—trading, amortized cost $76,525 and $90,339, respectively	4,987	5,684
Recurring [Member] | Total [Member] | Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	9,000	10,729
Recurring [Member] | Total [Member] | TPS and TRUP CDOs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	35,095	35,741
Recurring [Member] | Total [Member] | Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	329,075	277,757
Securities—trading, amortized cost $76,525 and $90,339, respectively	22,227	28,107
Recurring [Member] | Total [Member] | Equity securities and other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—trading, amortized cost $76,525 and $90,339, respectively	68	63
Recurring [Member] | Total [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities—available-for-sale, amortized cost $481,867 and $469,650, respectively	$ 25,249	$ 42,516