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2. Investment securities, Continuous Unrealized Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 68,853 $ 62,053
Less than 12 Months, Unrealized Losses 833 656
12 Months or More, Fair Value 7,171 12,913
12 Months or More, Unrealized Losses 110 138
Total, Fair Value 76,024 74,966
Total, Unrealized Losses 943 794
Mortgage-backed securities
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 35,129 48,126
Less than 12 Months, Unrealized Losses 237 468
12 Months or More, Fair Value 7,171 12,913
12 Months or More, Unrealized Losses 110 138
Total, Fair Value 42,300 61,039
Total, Unrealized Losses 347 606
U.S. Government sponsored enterprises
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 6,796 3,402
Less than 12 Months, Unrealized Losses 89 80
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 6,796 3,402
Total, Unrealized Losses 89 80
State and political subdivisions
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 25,406 9,490
Less than 12 Months, Unrealized Losses 450 104
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 25,406 9,490
Total, Unrealized Losses 450 104
Corporate bonds
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 1,522 1,035
Less than 12 Months, Unrealized Losses 57 4
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 1,522 1,035
Total, Unrealized Losses $ 57 $ 4