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2. Investment securities, Continuous Unrealized Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 19,379 $ 129,742
Less than 12 Months, Unrealized Losses 88 5,639
12 Months or More, Fair Value 43,956 12,463
12 Months or More, Unrealized Losses 933 356
Total, Fair Value 63,335 142,205
Total, Unrealized Losses 1,021 5,995
Mortgage-backed securities
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 11,266 40,857
Less than 12 Months, Unrealized Losses 14 691
12 Months or More, Fair Value 8,126 10,128
12 Months or More, Unrealized Losses 127 78
Total, Fair Value 19,392 50,985
Total, Unrealized Losses 141 769
U.S. Government sponsored enterprises
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 8,113 9,714
Less than 12 Months, Unrealized Losses 74 69
12 Months or More, Fair Value 3,926 0
12 Months or More, Unrealized Losses 73 0
Total, Fair Value 12,039 9,714
Total, Unrealized Losses 147 69
State and political subdivisions
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 0 77,187
Less than 12 Months, Unrealized Losses 0 4,863
12 Months or More, Fair Value 31,377 1,824
12 Months or More, Unrealized Losses 711 224
Total, Fair Value 31,377 79,011
Total, Unrealized Losses 711 5,087
Corporate bonds
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 0 1,984
Less than 12 Months, Unrealized Losses 0 16
12 Months or More, Fair Value 527 511
12 Months or More, Unrealized Losses 22 54
Total, Fair Value 527 2,495
Total, Unrealized Losses $ 22 $ 70