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2. Investment securities, Continuous Unrealized Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 129,742 $ 62,053
Less than 12 Months, Unrealized Losses 5,639 656
12 Months or More, Fair Value 12,463 12,913
12 Months or More, Unrealized Losses 356 138
Total, Fair Value 142,205 74,966
Total, Unrealized Losses 5,995 794
Mortgage-backed securities
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 40,857 48,126
Less than 12 Months, Unrealized Losses 691 468
12 Months or More, Fair Value 10,128 12,913
12 Months or More, Unrealized Losses 78 138
Total, Fair Value 50,985 61,039
Total, Unrealized Losses 769 606
U.S. Government sponsored enterprises
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 9,714 3,402
Less than 12 Months, Unrealized Losses 69 80
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 9,714 3,402
Total, Unrealized Losses 69 80
State and political subdivisions
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 77,187 9,490
Less than 12 Months, Unrealized Losses 4,863 104
12 Months or More, Fair Value 1,824 0
12 Months or More, Unrealized Losses 224 0
Total, Fair Value 79,011 9,490
Total, Unrealized Losses 5,087 104
Corporate bonds
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 1,984 1,035
Less than 12 Months, Unrealized Losses 16 4
12 Months or More, Fair Value 511 0
12 Months or More, Unrealized Losses 54 0
Total, Fair Value 2,495 1,035
Total, Unrealized Losses $ 70 $ 4