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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, 2014
Dec. 31, 2013
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 38,528 $ 129,742
Less than 12 Months, Unrealized Losses 263 5,639
12 Months or More, Fair Value 57,824 12,463
12 Months or More, Unrealized Losses 1,488 356
Total, Fair Value 96,352 142,205
Total, Unrealized Losses 1,751 5,995
Mortgage-backed securities
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 8,550 40,857
Less than 12 Months, Unrealized Losses 6 691
12 Months or More, Fair Value 18,386 10,128
12 Months or More, Unrealized Losses 164 78
Total, Fair Value 26,936 50,985
Total, Unrealized Losses 170 769
U.S. Government sponsored enterprises
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 16,483 9,714
Less than 12 Months, Unrealized Losses 217 69
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 16,483 9,714
Total, Unrealized Losses 217 69
State and political subdivisions
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 12,495 77,187
Less than 12 Months, Unrealized Losses 40 4,863
12 Months or More, Fair Value 38,905 1,824
12 Months or More, Unrealized Losses 1,302 224
Total, Fair Value 51,400 79,011
Total, Unrealized Losses 1,342 5,087
Corporate bonds
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 1,000 1,984
Less than 12 Months, Unrealized Losses 0 16
12 Months or More, Fair Value 533 511
12 Months or More, Unrealized Losses 22 54
Total, Fair Value 1,533 2,495
Total, Unrealized Losses $ 22 $ 70