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Loans and Allowance for Loan Losses (Details 6) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Activity in allowance for loan losses and the recorded investments in loans      
Beginning balance $ 28,677,000 $ 36,532,000  
Provision for loan losses (1,500,000) 0  
Charge-offs (2,415,000) (7,576,000)  
Recoveries 1,273,000 1,987,000  
Ending balance 26,035,000 30,943,000  
Ending balance: individually evaluated for impairment 14,893,000 15,023,000  
Ending balance: collectively evaluated for impairment 11,142,000 15,920,000  
Ending balance 1,022,956,000 1,051,674,000 1,041,189,000
Ending balance: individually evaluated for impairment 51,700,000 63,498,000  
Ending balance: collectively evaluated for impairment 971,256,000 988,176,000  
Commercial Loans [Member]
      
Activity in allowance for loan losses and the recorded investments in loans      
Beginning balance 26,043,000 33,431,000  
Provision for loan losses (1,164,000) (99,000)  
Charge-offs (2,412,000) (7,464,000)  
Recoveries 1,250,000 1,940,000  
Ending balance 23,717,000 27,808,000  
Ending balance: individually evaluated for impairment 14,616,000 14,611,000  
Ending balance: collectively evaluated for impairment 9,101,000 13,197,000  
Ending balance 948,964,000 976,452,000  
Ending balance: individually evaluated for impairment 49,636,000 61,320,000  
Ending balance: collectively evaluated for impairment 899,328,000 915,132,000  
Retail Loans [Member]
      
Activity in allowance for loan losses and the recorded investments in loans      
Beginning balance 2,645,000 3,019,000  
Provision for loan losses (363,000) 94,000  
Charge-offs (3,000) (112,000)  
Recoveries 23,000 47,000  
Ending balance 2,302,000 3,048,000  
Ending balance: individually evaluated for impairment 277,000 412,000  
Ending balance: collectively evaluated for impairment 2,025,000 2,636,000  
Ending balance 73,992,000 75,222,000  
Ending balance: individually evaluated for impairment 2,064,000 2,178,000  
Ending balance: collectively evaluated for impairment 71,928,000 73,044,000  
Unallocated [Member]
      
Activity in allowance for loan losses and the recorded investments in loans      
Beginning balance (11,000) 82,000  
Provision for loan losses 27,000 5,000  
Charge-offs 0 0  
Recoveries 0 0  
Ending balance 16,000 87,000  
Ending balance: individually evaluated for impairment 0 0  
Ending balance: collectively evaluated for impairment 16,000 87,000  
Ending balance        
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment