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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2013
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Investment Securities Available-for-Sale, Total temporary impaired securities      
Less than 12 months, Number 106 178 125
Less than 12 months, Fair Value $ 130,064 $ 202,228 $ 74,031
Less than 12 months, Gross Unrealized Holding Losses (1,898) (4,925) (737)
12 months or more, Number 13 1 27
12 months or more, Fair Value 17,358 12,607 1,031
12 months or more, Gross Unrealized Holding Losses (856) (913) (217)
Total, Number 119 179 152
Total, Fair Value 147,422 214,835 75,062
Total, Gross Unrealized Holding Losses (2,754) (5,838) (954)
Municipal bonds
     
Investment Securities Available-for-Sale, Total temporary impaired securities      
Less than 12 months, Number 74 133 122
Less than 12 months, Fair Value 36,765 61,524 53,773
Less than 12 months, Gross Unrealized Holding Losses (476) (1,850) (387)
12 months or more, Number 12    
12 months or more, Fair Value 5,046    
12 months or more, Gross Unrealized Holding Losses (110)    
Total, Number 86 133 122
Total, Fair Value 41,811 61,524 53,773
Total, Gross Unrealized Holding Losses (586) (1,850) (387)
Mortgage-backed securities
     
Investment Securities Available-for-Sale, Total temporary impaired securities      
Less than 12 months, Number 32 45 3
Less than 12 months, Fair Value 93,299 140,704 20,258
Less than 12 months, Gross Unrealized Holding Losses (1,422) (3,075) (350)
12 months or more, Number 1 1 27
12 months or more, Fair Value 12,312 12,607 1,031
12 months or more, Gross Unrealized Holding Losses (746) (913) (217)
Total, Number 33 46 30
Total, Fair Value 105,611 153,311 21,289
Total, Gross Unrealized Holding Losses $ (2,168) $ (3,988) $ (567)