LOANS AND LEASES, Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Financial effects of TDRs [Abstract]
Number of Contracts	136
Pre-Modification Outstanding Recorded Investment	$ 68,964
Post-Modification Outstanding Recorded Investment	58,697
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	34
Recorded Investment	13,004
Commercial and industrial segment [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	7
Pre-Modification Outstanding Recorded Investment	3,142
Post-Modification Outstanding Recorded Investment	2,374
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	4
Recorded Investment	1,506
Real estate segment [Member] | Consumer mortgages [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	35
Pre-Modification Outstanding Recorded Investment	6,901
Post-Modification Outstanding Recorded Investment	6,424
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	4
Recorded Investment	1,563
Real estate segment [Member] | Agricultural [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	4
Pre-Modification Outstanding Recorded Investment	2,650
Post-Modification Outstanding Recorded Investment	1,479
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	3
Recorded Investment	1,382
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	29
Pre-Modification Outstanding Recorded Investment	13,330
Post-Modification Outstanding Recorded Investment	11,740
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	6
Recorded Investment	1,683
Real estate segment [Member] | Construction, acquisition and development [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	30
Pre-Modification Outstanding Recorded Investment	23,863
Post-Modification Outstanding Recorded Investment	19,228
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	13
Recorded Investment	3,622
Real estate segment [Member] | Commercial [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	24
Pre-Modification Outstanding Recorded Investment	16,121
Post-Modification Outstanding Recorded Investment	15,046
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	3
Recorded Investment	2,946
All other receivables [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	7
Pre-Modification Outstanding Recorded Investment	2,957
Post-Modification Outstanding Recorded Investment	2,406
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	1
Recorded Investment	$ 302