LOANS AND LEASES, Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013 Contract	Dec. 31, 2012 Contract
Financial effects of TDRs [Abstract]
Number of Contracts	6	136
Pre-Modification Outstanding Recorded Investment	$ 804	$ 58,378
Post-Modification Outstanding Recorded Investment	790	56,042
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	17	58
Recorded Investment	5,903	13,139
Commercial and industrial segment [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	1	8
Pre-Modification Outstanding Recorded Investment	48	1,686
Post-Modification Outstanding Recorded Investment	48	1,348
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	3	2
Recorded Investment	129	179
Real estate segment [Member] | Consumer mortgages [Member]
Financial effects of TDRs [Abstract]
Number of Contracts		38
Pre-Modification Outstanding Recorded Investment		9,875
Post-Modification Outstanding Recorded Investment		9,109
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	5	18
Recorded Investment	451	2,096
Real estate segment [Member] | Home Equity [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment	15
Post-Modification Outstanding Recorded Investment	0
Real estate segment [Member] | Agricultural [Member]
Financial effects of TDRs [Abstract]
Number of Contracts		2
Pre-Modification Outstanding Recorded Investment		853
Post-Modification Outstanding Recorded Investment		861
TDRs modified for which there was a payment default [Abstract]
Number of Contracts		1
Recorded Investment		170
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	3	30
Pre-Modification Outstanding Recorded Investment	573	14,367
Post-Modification Outstanding Recorded Investment	575	13,741
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	3	11
Recorded Investment	265	2,659
Real estate segment [Member] | Construction, acquisition and development [Member]
Financial effects of TDRs [Abstract]
Number of Contracts		37
Pre-Modification Outstanding Recorded Investment		21,583
Post-Modification Outstanding Recorded Investment		21,159
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	2	21
Recorded Investment	1,523	5,503
Real estate segment [Member] | Commercial real estate [Member]
Financial effects of TDRs [Abstract]
Number of Contracts	1	12
Pre-Modification Outstanding Recorded Investment	168	8,159
Post-Modification Outstanding Recorded Investment	167	8,132
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	3	4
Recorded Investment	3,534	2,525
All other [Member]
Financial effects of TDRs [Abstract]
Number of Contracts		9
Pre-Modification Outstanding Recorded Investment		1,855
Post-Modification Outstanding Recorded Investment		1,692
TDRs modified for which there was a payment default [Abstract]
Number of Contracts	1	1
Recorded Investment	$ 1	$ 7