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Loans and Allowance for Loan Losses (Details 7) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Activity in allowance for loan losses and recorded investments in loans      
Beginning balance $ 36,532,000 $ 45,368,000 $ 47,878,000
Provision for loan losses (3,100,000) 6,900,000 31,800,000
Charge-offs (12,644,000) (19,897,000) (37,128,000)
Recoveries 7,889,000 4,161,000 2,818,000
Ending balance 28,677,000 36,532,000 45,368,000
Ending balance: individually evaluated for impairment 17,189,000 18,996,000 9,702,000
Ending balance: collectively evaluated for impairment 11,488,000 17,536,000 35,666,000
Ending balance 1,041,189,000 1,072,422,000 1,262,630,000
Ending balance: individually evaluated for impairment 57,279,000 70,978,000 65,956,000
Ending balance: collectively evaluated for impairment 983,910,000 1,001,444,000 1,196,674,000
Commercial Loans [Member]
      
Activity in allowance for loan losses and recorded investments in loans      
Beginning balance 33,431,000 42,359,000 46,603,000
Provision for loan losses (2,800,000) 4,125,000 29,030,000
Charge-offs (12,075,000) (16,978,000) (35,968,000)
Recoveries 7,487,000 3,925,000 2,694,000
Ending balance 26,043,000 33,431,000 42,359,000
Ending balance: individually evaluated for impairment 16,860,000 18,645,000 8,504,000
Ending balance: collectively evaluated for impairment 9,183,000 14,786,000 33,855,000
Ending balance 968,506,000 996,905,000 1,175,970,000
Ending balance: individually evaluated for impairment 55,138,000 68,893,000 62,849,000
Ending balance: collectively evaluated for impairment 913,368,000 928,012,000 1,113,121,000
Retail Loans [Member]
      
Activity in allowance for loan losses and recorded investments in loans      
Beginning balance 3,019,000 2,972,000 1,256,000
Provision for loan losses (207,000) 2,730,000 2,752,000
Charge-offs (569,000) (2,919,000) (1,160,000)
Recoveries 402,000 236,000 124,000
Ending balance 2,645,000 3,019,000 2,972,000
Ending balance: individually evaluated for impairment 329,000 351,000 1,198,000
Ending balance: collectively evaluated for impairment 2,316,000 2,668,000 1,774,000
Ending balance 72,683,000 75,517,000 86,660,000
Ending balance: individually evaluated for impairment 2,141,000 2,085,000 3,107,000
Ending balance: collectively evaluated for impairment 70,542,000 73,432,000 83,553,000
Unallocated [Member]
      
Activity in allowance for loan losses and recorded investments in loans      
Beginning balance 82,000 37,000 19,000
Provision for loan losses (93,000) 45,000 18,000
Charge-offs 0 0 0
Recoveries 0 0 0
Ending balance (11,000) 82,000 37,000
Ending balance: individually evaluated for impairment 0 0 0
Ending balance: collectively evaluated for impairment (11,000) 82,000 37,000
Ending balance         
Ending balance: individually evaluated for impairment         
Ending balance: collectively evaluated for impairment