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2. Investment securities, Continuous Unrealized Loss Position (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 101,909 $ 129,742
Less than 12 Months, Unrealized Losses 2,292 5,639
12 Months or More, Fair Value 25,722 12,463
12 Months or More, Unrealized Losses 1,167 356
Total, Fair Value 127,631 142,205
Total, Unrealized Losses 3,459 5,995
Mortgage-backed securities
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 37,706 40,857
Less than 12 Months, Unrealized Losses 495 691
12 Months or More, Fair Value 7,749 10,128
12 Months or More, Unrealized Losses 21 78
Total, Fair Value 45,455 50,985
Total, Unrealized Losses 516 769
U.S. Government sponsored enterprises
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 13,898 9,714
Less than 12 Months, Unrealized Losses 173 69
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 13,898 9,714
Total, Unrealized Losses 173 69
State and political subdivisions
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 49,309 77,187
Less than 12 Months, Unrealized Losses 1,620 4,863
12 Months or More, Fair Value 17,448 1,824
12 Months or More, Unrealized Losses 1,111 224
Total, Fair Value 66,757 79,011
Total, Unrealized Losses 2,731 5,087
Corporate bonds
    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 996 1,984
Less than 12 Months, Unrealized Losses 4 16
12 Months or More, Fair Value 525 511
12 Months or More, Unrealized Losses 35 54
Total, Fair Value 1,521 2,495
Total, Unrealized Losses $ 39 $ 70