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Securities (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost $ 636,877,000   $ 636,877,000     $ 645,054,000    
Unrealized Gains 31,367,000   31,367,000     30,654,000    
Unrealized Losses (9,493,000)   (9,493,000)     (9,421,000)    
Fair Value 658,751,000   658,751,000     666,287,000    
Amortized Cost                
Due in one year or less 7,923,000   7,923,000          
Due after one but within five years 41,808,000   41,808,000          
Due after five but within ten years 88,072,000   88,072,000          
Due after ten years 207,464,000   207,464,000          
Total of securities having specified maturity period 345,267,000   345,267,000          
Mortgage-backed securities and equities 291,610,000   291,610,000          
Total 636,877,000   636,877,000     645,054,000    
Fair Value                
Due in one year or less 8,038,000   8,038,000          
Due after one but within five years 43,713,000   43,713,000          
Due after five but within ten years 93,252,000   93,252,000          
Due after ten years 206,985,000   206,985,000          
Total of securities having specified maturities period 351,988,000   351,988,000          
Mortgage-backed securities and equities 306,763,000   306,763,000          
TOTAL 658,751,000   658,751,000     666,287,000    
Gain on sale of investments 660,000   664,000 7,000        
OTTI losses recognized on investments 11,000 97,000 11,000 97,000        
Less Than 12 Months                
Fair Value 21,290,000   21,290,000     1,110,000    
Unrealized Losses (119,000)   (119,000)     (11,000)    
More Than 12 Months                
Fair Value 3,208,000   3,208,000     3,603,000    
Unrealized Losses (9,374,000)   (9,374,000)     (9,410,000)    
Total                
Fair Value 24,498,000   24,498,000     4,713,000    
Total Unrealised Losses (9,493,000)   (9,493,000)     (9,421,000)    
Cumulative OTTI charges 14,983,000 15,167,000 14,983,000 15,167,000 15,180,000 15,180,000 15,070,000 15,070,000
Loss on sale of investments 4,000   4,000          
Maximum | Standard & Poors
                
Total                
Credit quality pricing (as a percent) 65.10%   65.10%          
Maximum | Moody Investor Service
                
Total                
Credit quality pricing (as a percent) 94.54%   94.54%          
Minimum | Standard & Poors
                
Total                
Credit quality pricing (as a percent) 2.30%   2.30%          
Minimum | Moody Investor Service
                
Total                
Credit quality pricing (as a percent) 0.06%   0.06%          
U.S. Government agencies
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 1,899,000   1,899,000     3,979,000    
Unrealized Gains 85,000   85,000     34,000    
Fair Value 1,984,000   1,984,000     4,013,000    
Amortized Cost                
Total 1,899,000   1,899,000     3,979,000    
Mortgage Backed Securities - Residential
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 291,240,000   291,240,000     296,646,000    
Unrealized Gains 15,152,000   15,152,000     15,142,000    
Fair Value 306,392,000   306,392,000     311,788,000    
Amortized Cost                
Total 291,240,000   291,240,000     296,646,000    
Mortgage Backed Securities - Commercial
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 50,000   50,000     98,000    
Unrealized Gains 1,000   1,000     3,000    
Fair Value 51,000   51,000     101,000    
Amortized Cost                
Total 50,000   50,000     98,000    
Collateralized Mortgage Obligations
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 143,679,000   143,679,000     144,850,000    
Unrealized Gains 3,399,000   3,399,000     3,097,000    
Unrealized Losses (34,000)   (34,000)          
Fair Value 147,044,000   147,044,000     147,947,000    
Amortized Cost                
Total 143,679,000   143,679,000     144,850,000    
Less Than 12 Months                
Fair Value 13,552,000   13,552,000          
Unrealized Losses (34,000)   (34,000)          
Total                
Fair Value 13,552,000   13,552,000          
Total Unrealised Losses (34,000)   (34,000)          
State and Municipal Obligations
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 186,180,000   186,180,000     183,854,000    
Unrealized Gains 12,486,000   12,486,000     11,738,000    
Unrealized Losses (85,000)   (85,000)     (11,000)    
Fair Value 198,581,000   198,581,000     195,581,000    
Amortized Cost                
Total 186,180,000   186,180,000     183,854,000    
Less Than 12 Months                
Fair Value 7,738,000   7,738,000     1,110,000    
Unrealized Losses (85,000)   (85,000)     (11,000)    
Total                
Fair Value 7,738,000   7,738,000     1,110,000    
Total Unrealised Losses (85,000)   (85,000)     (11,000)    
Collateralized Debt Obligations
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 13,509,000   13,509,000     14,031,000    
Unrealized Gains 244,000   244,000     150,000    
Unrealized Losses (9,374,000)   (9,374,000)     (9,410,000)    
Fair Value 4,379,000   4,379,000     4,771,000    
Amortized Cost                
Total 13,509,000   13,509,000     14,031,000    
More Than 12 Months                
Fair Value 3,208,000   3,208,000     3,603,000    
Unrealized Losses (9,374,000)   (9,374,000)     (9,410,000)    
Total                
Fair Value 3,208,000   3,208,000     3,603,000    
Total Unrealised Losses (9,374,000)   (9,374,000)     (9,410,000)    
Other-than-temporarily impaired CDO
                
Total                
Number of CDO's 3   3          
Contractual balance 28,000,000   28,000,000          
Reduced balance 3,700,000   3,700,000          
Interest payment received 700,000   700,000          
Cumulative OTTI charges 14,900,000   14,900,000          
Other comprehensive income before tax 8,700,000   8,700,000          
Other comprehensive income net of tax 5,200,000   5,200,000          
Base discount rate, which is subject to an additional margin     3 month LIBOR          
Other-than-temporarily impaired CDO | Maximum
                
Total                
Severity of OTTI (as a percent)     87.00%          
Discount rate, margin on variable rate basis (as a percent) 1.80%   1.80%          
Other-than-temporarily impaired CDO | Minimum
                
Total                
Severity of OTTI (as a percent)     28.00%          
Discount rate, margin on variable rate basis (as a percent) 1.60%   1.60%          
Pooled trust preferred securities
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 1,000,000   1,000,000          
Fair Value 700,000   700,000          
Amortized Cost                
Total 1,000,000   1,000,000          
Equity Securities
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 320,000   320,000     1,596,000    
Unrealized Gains           490,000    
Fair Value 320,000   320,000     2,086,000    
Amortized Cost                
Total 320,000   320,000     1,596,000    
Fair Value                
OTTI losses recognized on investments $ 11,000