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2. Investment securities, Continuous Unrealized Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 106,491 $ 62,053
Less than 12 Months, Unrealized Losses 3,914 656
12 Months or More, Fair Value 5,298 12,913
12 Months or More, Unrealized Losses 70 138
Total, Fair Value 111,789 74,966
Total, Unrealized Losses 3,984 794
Mortgage-backed securities
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 48,281 48,126
Less than 12 Months, Unrealized Losses 503 468
12 Months or More, Fair Value 5,298 12,913
12 Months or More, Unrealized Losses 70 138
Total, Fair Value 53,579 61,039
Total, Unrealized Losses 573 606
U.S. Government sponsored enterprises
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 0 3,402
Less than 12 Months, Unrealized Losses 0 80
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 0 3,402
Total, Unrealized Losses 0 80
State and political subdivisions
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 56,713 9,490
Less than 12 Months, Unrealized Losses 3,333 104
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 56,713 9,490
Total, Unrealized Losses 3,333 104
Corporate bonds
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 1,497 1,035
Less than 12 Months, Unrealized Losses 78 4
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 1,497 1,035
Total, Unrealized Losses $ 78 $ 4