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Securities - Unrealized Loss Positions (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
security
Dec. 31, 2013
security
Number of Securities    
Less than 12 months in an unrealized loss position 20 27
Greater than 12 months in an unrealized loss position 9 5
Total 29 32
Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,050 $ 6,633
Greater than 12 months in an unrealized loss position 2,761 532
Total 4,811 7,165
Fair Value    
Less than 12 months in an unrealized loss position 126,956 170,149
Greater than 12 months in an unrealized loss position 59,005 10,836
Total 185,961 180,985
Number of Securities    
Less than 12 months in an unrealized loss position 13 25
Total 13 25
Unrealized Losses    
Less than 12 months in an unrealized loss position 952 2,931
Total 952 2,931
Fair Value    
Less than 12 months in an unrealized loss position 107,145 175,766
Total 107,145 175,766
U.S. Treasury
    
Number of Securities    
Less than 12 months in an unrealized loss position 1 1
Total 1 1
Unrealized Losses    
Less than 12 months in an unrealized loss position 1 5
Total 1 5
Fair Value    
Less than 12 months in an unrealized loss position 1,538 1,544
Total 1,538 1,544
U.S. government agencies
    
Number of Securities    
Greater than 12 months in an unrealized loss position 1 1
Total 1 1
Unrealized Losses    
Greater than 12 months in an unrealized loss position 71 66
Total 71 66
Fair Value    
Greater than 12 months in an unrealized loss position 1,653 1,672
Total 1,653 1,672
U.S. government agency mortgage-backed
    
Number of Securities    
Less than 12 months in an unrealized loss position   6
Total   6
Unrealized Losses    
Less than 12 months in an unrealized loss position   73
Total   73
Fair Value    
Less than 12 months in an unrealized loss position   19,134
Total   19,134
States and political subdivisions
    
Number of Securities    
Less than 12 months in an unrealized loss position 2 6
Greater than 12 months in an unrealized loss position 3  
Total 5 6
Unrealized Losses    
Less than 12 months in an unrealized loss position 281 217
Greater than 12 months in an unrealized loss position 20  
Total 301 217
Fair Value    
Less than 12 months in an unrealized loss position 3,214 4,625
Greater than 12 months in an unrealized loss position 3,055  
Total 6,269 4,625
Corporate bonds
    
Number of Securities    
Less than 12 months in an unrealized loss position 5 4
Greater than 12 months in an unrealized loss position 1 2
Total 6 6
Unrealized Losses    
Less than 12 months in an unrealized loss position 256 429
Greater than 12 months in an unrealized loss position 74 219
Total 330 648
Fair Value    
Less than 12 months in an unrealized loss position 15,982 10,493
Greater than 12 months in an unrealized loss position 1,928 2,796
Total 17,910 13,289
Collateralized mortgage obligations
    
Number of Securities    
Less than 12 months in an unrealized loss position   5
Greater than 12 months in an unrealized loss position 3  
Total 3 5
Unrealized Losses    
Less than 12 months in an unrealized loss position   3,146
Greater than 12 months in an unrealized loss position 1,970  
Total 1,970 3,146
Fair Value    
Less than 12 months in an unrealized loss position   54,021
Greater than 12 months in an unrealized loss position 26,288  
Total 26,288 54,021
Number of Securities    
Less than 12 months in an unrealized loss position 13 19
Total 13 19
Unrealized Losses    
Less than 12 months in an unrealized loss position 952 2,858
Total 952 2,858
Fair Value    
Less than 12 months in an unrealized loss position 107,145 156,632
Total 107,145 156,632
Asset-backed securities
    
Number of Securities    
Less than 12 months in an unrealized loss position 12 11
Greater than 12 months in an unrealized loss position 1 2
Total 13 13
Unrealized Losses    
Less than 12 months in an unrealized loss position 1,512 2,836
Greater than 12 months in an unrealized loss position 626 247
Total 2,138 3,083
Fair Value    
Less than 12 months in an unrealized loss position 106,222 99,466
Greater than 12 months in an unrealized loss position 26,081 6,368
Total $ 132,303 $ 105,834