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Loans and Allowance for Loan Losses (Details 6) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Activity in allowance for loan losses and the recorded investments in loans          
Beginning balance $ 26,035,000 $ 30,943,000 $ 28,677,000 $ 36,532,000  
Provision for loan losses (1,500,000) (3,000,000) (3,000,000) (3,000,000)  
Charge-offs (382,000) (1,708,000) (2,797,000) (9,284,000)  
Recoveries 794,000 3,454,000 2,067,000 5,441,000  
Ending balance 24,947,000 29,689,000 24,947,000 29,689,000  
Ending balance: individually evaluated for impairment 14,836,000 13,200,000 14,836,000 13,200,000  
Ending balance: collectively evaluated for impairment 10,111,000 16,489,000 10,111,000 16,489,000  
Ending balance 1,058,662,000 1,060,996,000 1,058,662,000 1,060,996,000 1,041,189,000
Ending balance: individually evaluated for impairment 53,677,000 51,623,000 53,677,000 51,623,000  
Ending balance: collectively evaluated for impairment 1,004,985,000 1,009,373,000 1,004,985,000 1,009,373,000  
Commercial Loans [Member]
          
Activity in allowance for loan losses and the recorded investments in loans          
Beginning balance 23,717,000 27,808,000 26,043,000 33,431,000  
Provision for loan losses (1,480,000) (3,026,000) (2,644,000) (3,125,000)  
Charge-offs (363,000) (1,650,000) (2,775,000) (9,113,000)  
Recoveries 508,000 3,339,000 1,758,000 5,278,000  
Ending balance 22,382,000 26,471,000 22,382,000 26,471,000  
Ending balance: individually evaluated for impairment 13,806,000 12,584,000 13,806,000 12,584,000  
Ending balance: collectively evaluated for impairment 8,576,000 13,887,000 8,576,000 13,887,000  
Ending balance 985,616,000 987,491,000 985,616,000 987,491,000 968,506,000
Ending balance: individually evaluated for impairment 49,590,000 49,478,000 49,590,000 49,478,000  
Ending balance: collectively evaluated for impairment 936,026,000 938,013,000 936,026,000 938,013,000  
Retail Loans [Member]
          
Activity in allowance for loan losses and the recorded investments in loans          
Beginning balance 2,302,000 3,048,000 2,645,000 3,019,000  
Provision for loan losses (10,000) 62,000 (373,000) 156,000  
Charge-offs (19,000) (58,000) (22,000) (171,000)  
Recoveries 286,000 115,000 309,000 163,000  
Ending balance 2,559,000 3,167,000 2,559,000 3,167,000  
Ending balance: individually evaluated for impairment 1,030,000 616,000 1,030,000 616,000  
Ending balance: collectively evaluated for impairment 1,529,000 2,551,000 1,529,000 2,551,000  
Ending balance 73,046,000 73,505,000 73,046,000 73,505,000 72,683,000
Ending balance: individually evaluated for impairment 4,087,000 2,145,000 4,087,000 2,145,000  
Ending balance: collectively evaluated for impairment 68,959,000 71,360,000 68,959,000 71,360,000  
Unallocated [Member]
          
Activity in allowance for loan losses and the recorded investments in loans          
Beginning balance 16,000 87,000 (11,000) 82,000  
Provision for loan losses (10,000) (36,000) 17,000 (31,000)  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance 6,000 51,000 6,000 51,000  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 6,000 51,000 6,000 51,000  
Ending balance              
Ending balance: individually evaluated for impairment              
Ending balance: collectively evaluated for impairment