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2. Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Investment securities available for sale    
Estimated Fair Value $ 297,823 $ 321,388
Amortized Cost    
Due within one year 4,139  
Due from one to five years 14,285  
Due from five to ten years 100,595  
Due after ten years 22,107  
Mortgage-backed securities 146,755  
Equity securities 748  
Total 288,629  
Estimated Fair Value    
Due within one year 4,163  
Due from one to five years 14,768  
Due from five to ten years 106,246  
Due after ten years 23,154  
Mortgage-backed securities 148,024  
Equity securities 1,468  
Total 297,823  
Fair value measurements    
Estimated Fair Value 297,823 321,388
Investment Securities Available for Sale Level 3 Valuation    
Balance, beginning of period 6,594  
Transfers in and/or (out) of Level 3 (5,344)  
Balance, end of period 1,250  
Mortgage-backed securities
    
Investment securities available for sale    
Amortized Cost 146,755 213,378
Gross Unrealized Gains 1,875 1,371
Gross Unrealized Losses 606 1,056
Estimated Fair Value 148,024 213,693
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 48,126 95,122
Less than 12 Months, Unrealized Losses 468 991
12 Months or More, Fair Value 12,913 4,125
12 Months or More, Unrealized Losses 138 65
Total, Fair Value 61,039 99,247
Total, Unrealized Losses 606 1,056
Fair value measurements    
Estimated Fair Value 148,024 213,693
Level 1 valuation 0 0
Level 2 valuation 148,024 208,349
Level 3 valuation 0 5,344
U.S. Government sponsored enterprises
    
Investment securities available for sale    
Amortized Cost 18,714 7,429
Gross Unrealized Gains 203 265
Gross Unrealized Losses 80 0
Estimated Fair Value 18,837 7,694
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 3,402  
Less than 12 Months, Unrealized Losses 80  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total, Fair Value 3,402  
Total, Unrealized Losses 80  
Fair value measurements    
Estimated Fair Value 18,837 7,694
Level 1 valuation 0 0
Level 2 valuation 18,837 7,694
Level 3 valuation 0 0
State and political subdivisions
    
Investment securities available for sale    
Amortized Cost 118,591 92,996
Gross Unrealized Gains 7,171 4,157
Gross Unrealized Losses 104 56
Estimated Fair Value 125,658 97,097
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 9,490 4,444
Less than 12 Months, Unrealized Losses 104 56
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 9,490 4,444
Total, Unrealized Losses 104 56
Fair value measurements    
Estimated Fair Value 125,658 97,097
Level 1 valuation 0 0
Level 2 valuation 125,658 97,097
Level 3 valuation 0 0
Corporate bonds
    
Investment securities available for sale    
Amortized Cost 2,571 546
Gross Unrealized Gains 19 0
Gross Unrealized Losses 4 3
Estimated Fair Value 2,586 543
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 1,035 542
Less than 12 Months, Unrealized Losses 4 3
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 1,035 542
Total, Unrealized Losses 4 3
Fair value measurements    
Estimated Fair Value 2,586 543
Level 1 valuation 0 0
Level 2 valuation 2,586 543
Level 3 valuation 0 0
Trust preferred securities
    
Investment securities available for sale    
Amortized Cost 1,250 1,250
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 1,250 1,250
Fair value measurements    
Estimated Fair Value 1,250 1,250
Level 1 valuation 0 0
Level 2 valuation 0 0
Level 3 valuation 1,250 1,250
Equity securities
    
Investment securities available for sale    
Amortized Cost 748 748
Gross Unrealized Gains 720 363
Gross Unrealized Losses 0 0
Estimated Fair Value 1,468 1,111
Fair value measurements    
Estimated Fair Value 1,468 1,111
Level 1 valuation 1,468 1,111
Level 2 valuation 0 0
Level 3 valuation 0 0
Total
    
Investment securities available for sale    
Amortized Cost 288,629 316,347
Gross Unrealized Gains 9,988 6,156
Gross Unrealized Losses 794 1,115
Estimated Fair Value 297,823 321,388
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 62,053 100,108
Less than 12 Months, Unrealized Losses 656 1,050
12 Months or More, Fair Value 12,913 4,125
12 Months or More, Unrealized Losses 138 65
Total, Fair Value 74,966 104,233
Total, Unrealized Losses 794 1,115
Fair value measurements    
Estimated Fair Value $ 297,823 $ 321,388