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LOANS AND ALLOWANCE FOR CREDIT LOSSES (Details 6) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Allowance for credit losses:                    
Beginning balance       $ 14,288       $ 14,227 $ 14,288 $ 14,227
Charge-offs                 (26,645) (20,556)
Recoveries                 603 1,147
Net charge-offs                 (26,042) (19,409)
Provision 9,650 6,200 3,525 8,370 4,035 3,650 5,395 6,390 27,745 19,470
Ending balance 15,991       14,288       15,991 14,288
Unallocated Financing Receivables [Member]
                    
Allowance for credit losses:                    
Beginning balance       22       343 22 343
Charge-offs                 0 0
Recoveries                 0 0
Net charge-offs                 0 0
Provision                 165 (321)
Ending balance 187       22       187 22
Commercial Loan [Member]
                    
Allowance for credit losses:                    
Beginning balance       1,498       1,422 1,498 1,422
Charge-offs                 (5,451) (3,388)
Recoveries                 304 549
Net charge-offs                 (5,147) (2,839)
Provision                 5,331 2,915
Ending balance 1,682       1,498       1,682 1,498
Consumer Loan [Member]
                    
Allowance for credit losses:                    
Beginning balance       594       637 594 637
Charge-offs                 (576) (202)
Recoveries                 25 68
Net charge-offs                 (551) (134)
Provision                 364 91
Ending balance 407       594       407 594
Residential Real Estate [Member]
                    
Allowance for credit losses:                    
Beginning balance       5,014       4,833 5,014 4,833
Charge-offs                 (9,838) (7,693)
Recoveries                 102 120
Net charge-offs                 (9,736) (7,573)
Provision                 9,916 7,754
Ending balance 5,194       5,014       5,194 5,014
Commercial Real Estate [Member]
                    
Allowance for credit losses:                    
Beginning balance       3,415       3,665 3,415 3,665
Charge-offs                 (2,954) (5,037)
Recoveries                 166 361
Net charge-offs                 (2,788) (4,676)
Provision                 3,507 4,426
Ending balance 4,134       3,415       4,134 3,415
Construction Loans [Member]
                    
Allowance for credit losses:                    
Beginning balance       3,745       3,327 3,745 3,327
Charge-offs                 (7,826) (4,236)
Recoveries                 6 49
Net charge-offs                 (7,820) (4,187)
Provision                 8,462 4,605
Ending balance $ 4,387       $ 3,745       $ 4,387 $ 3,745