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Securities (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost $ 631,509,000     $ 631,509,000   $ 645,054,000    
Unrealized Gains 33,930,000     33,930,000   30,654,000    
Unrealized Losses (8,933,000)     (8,933,000)   (9,421,000)    
Fair Value 656,506,000     656,506,000   666,287,000    
Amortized Cost                
Due in one year or less 8,880,000     8,880,000        
Due after one but within five years 39,691,000     39,691,000        
Due after five but within ten years 84,482,000     84,482,000        
Due after ten years 232,403,000     232,403,000        
Total of securities having specified maturity period 365,456,000     365,456,000        
Mortgage-backed securities and equities 266,053,000     266,053,000        
Total 631,509,000     631,509,000   645,054,000    
Fair Value                
Due in one year or less 8,997,000     8,997,000        
Due after one but within five years 41,556,000     41,556,000        
Due after five but within ten years 89,991,000     89,991,000        
Due after ten years 233,041,000     233,041,000        
Total of securities having specified maturities period 373,585,000     373,585,000        
Mortgage-backed securities and equities 282,921,000     282,921,000        
TOTAL 656,506,000     656,506,000   666,287,000    
Gain on sale of investments 19,000     683,000 7,000      
OTTI losses recognized on investments   11,000 13,000 11,000 110,000      
Less Than 12 Months                
Fair Value 37,948,000     37,948,000   1,110,000    
Unrealized Losses (146,000)     (146,000)   (11,000)    
More Than 12 Months                
Fair Value 3,423,000     3,423,000   3,603,000    
Unrealized Losses (8,787,000)     (8,787,000)   (9,410,000)    
Total                
Fair Value 41,371,000     41,371,000   4,713,000    
Total Unrealised Losses (8,933,000)     (8,933,000)   (9,421,000)    
Cumulative OTTI charges 14,983,000 14,983,000 15,180,000 14,983,000 15,180,000 15,180,000 15,167,000 15,070,000
Loss on sale of investments 2,000     6,000 110,000      
Maximum | Standard & Poors
                
Total                
Credit quality pricing (as a percent) 68.90%     68.90%        
Maximum | Moody Investor Service
                
Total                
Credit quality pricing (as a percent) 94.77%     94.77%        
Minimum | Standard & Poors
                
Total                
Credit quality pricing (as a percent) 2.80%     2.80%        
Minimum | Moody Investor Service
                
Total                
Credit quality pricing (as a percent) 0.64%     0.64%        
U.S. Government agencies
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 1,810,000     1,810,000   3,979,000    
Unrealized Gains 74,000     74,000   34,000    
Fair Value 1,884,000     1,884,000   4,013,000    
Amortized Cost                
Total 1,810,000     1,810,000   3,979,000    
Mortgage Backed Securities - Residential
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 265,685,000     265,685,000   296,646,000    
Unrealized Gains 16,834,000     16,834,000   15,142,000    
Fair Value 282,519,000     282,519,000   311,788,000    
Amortized Cost                
Total 265,685,000     265,685,000   296,646,000    
Mortgage Backed Securities - Commercial
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 48,000     48,000   98,000    
Unrealized Gains 1,000     1,000   3,000    
Fair Value 49,000     49,000   101,000    
Amortized Cost                
Total 48,000     48,000   98,000    
Collateralized Mortgage Obligations
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 162,047,000     162,047,000   144,850,000    
Unrealized Gains 3,141,000     3,141,000   3,097,000    
Unrealized Losses (113,000)     (113,000)        
Fair Value 165,075,000     165,075,000   147,947,000    
Amortized Cost                
Total 162,047,000     162,047,000   144,850,000    
Less Than 12 Months                
Fair Value 35,579,000     35,579,000        
Unrealized Losses (113,000)     (113,000)        
Total                
Fair Value 35,579,000     35,579,000        
Total Unrealised Losses (113,000)     (113,000)        
State and Municipal Obligations
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 188,493,000     188,493,000   183,854,000    
Unrealized Gains 13,361,000     13,361,000   11,738,000    
Unrealized Losses (33,000)     (33,000)   (11,000)    
Fair Value 201,821,000     201,821,000   195,581,000    
Amortized Cost                
Total 188,493,000     188,493,000   183,854,000    
Less Than 12 Months                
Fair Value 2,369,000     2,369,000   1,110,000    
Unrealized Losses (33,000)     (33,000)   (11,000)    
Total                
Fair Value 2,369,000     2,369,000   1,110,000    
Total Unrealised Losses (33,000)     (33,000)   (11,000)    
Collateralized Debt Obligations
                
Amortized cost and fair value of investments classified as available for sale                
Amortized Cost 13,106,000     13,106,000   14,031,000    
Unrealized Gains 486,000     486,000   150,000    
Unrealized Losses (8,787,000)     (8,787,000)   (9,410,000)    
Fair Value 4,805,000     4,805,000   4,771,000    
Amortized Cost                
Total 13,106,000     13,106,000   14,031,000    
More Than 12 Months                
Fair Value 3,423,000     3,423,000   3,603,000    
Unrealized Losses (8,787,000)     (8,787,000)   (9,410,000)    
Total                
Fair Value 3,423,000     3,423,000   3,603,000    
Total Unrealised Losses (8,787,000)     (8,787,000)   (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 4,200,000     4,200,000        
Interest payment received 900,000     900,000        
Cumulative OTTI charges 14,900,000     14,900,000        
Other comprehensive income before tax 8,000,000     8,000,000        
Other comprehensive income net of tax 4,800,000     4,800,000        
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 830,000     830,000        
Fair Value 572,000     572,000        
Amortized Cost                
Total 830,000     830,000        
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 33,000     33,000   490,000    
Fair Value 353,000     353,000   2,086,000    
Amortized Cost                
Total 320,000     320,000   1,596,000    
Fair Value                
OTTI losses recognized on investments   $ 11,000