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Investment Securities - Investment Securities in Unrealized Loss Positions (Details)
$ in Thousands
Jun. 30, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Number of investment securities other-than-temporarily impaired | security 0  
Number of investment securities in unrealized loss position | security 35 28
Held-to-maturity, less than 12 continuous months, Fair value $ 20,247 $ 8,839
Held-to-maturity, less than 12 continuous months, Unrealized loss (59) (28)
Held-to-maturity, greater than 12 continuous months, Fair value 357 3,892
Held-to-maturity, greater than 12 continuous months, Unrealized loss (13) (37)
Held-to-maturity, Total Securities in a loss position, Fair value 20,604 12,731
Held-to-maturity, Gross Unrealized Losses (72) (65)
Available-for-sale, less than 12 continuous months, Fair value 49,191 27,387
Available-for-sale, less than 12 continuous months, Unrealized loss (297) (91)
Available-for-sale, greater than 12 continuous months, Fair value 16,276 18,277
Available-for-sale, greater than 12 continuous months, Unrealized loss (224) (340)
Available-for-sale, Total Securities in a loss position, Fair Value 65,467 45,664
Available-for-sale, Total Securities in a loss position, Unrealized loss (521) (431)
Marketable securities, less than 12 continuous months, Fair value 69,438 36,226
Marketable securities, less than 12 continuous months, Unrealized loss (356) (119)
Marketable securities, greater than 12 continuous months, Fair value 16,633 22,169
Marketable securities, greater than 12 continuous months, Unrealized loss (237) (377)
Marketable securities, Total Securities in a loss position, Fair value 86,071 58,395
Marketable securities, Total Securities in a loss position, Unrealized loss $ (593) (496)
Number of investment securities in unrealized loss position longer than 12 months | security 6  
Number of investment securities in unrealized loss position less than 12 months | security 29  
Mortgage-backed Securities, Issued by FHLMC and FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value $ 30,577 1,960
Available-for-sale, less than 12 continuous months, Unrealized loss (194) (11)
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 30,577 1,960
Available-for-sale, Total Securities in a loss position, Unrealized loss (194) (11)
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value 0 0
Available-for-sale, less than 12 continuous months, Unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, Fair value 3,698 4,115
Available-for-sale, greater than 12 continuous months, Unrealized loss (37) (58)
Available-for-sale, Total Securities in a loss position, Fair Value 3,698 4,115
Available-for-sale, Total Securities in a loss position, Unrealized loss (37) (58)
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value 0 17,157
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (44)
Available-for-sale, greater than 12 continuous months, Fair value 2,140 2,291
Available-for-sale, greater than 12 continuous months, Unrealized loss (38) (43)
Available-for-sale, Total Securities in a loss position, Fair Value 2,140 19,448
Available-for-sale, Total Securities in a loss position, Unrealized loss (38) (87)
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value 2,810 3,262
Available-for-sale, less than 12 continuous months, Unrealized loss (8) (16)
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 2,810 3,262
Available-for-sale, Total Securities in a loss position, Unrealized loss (8) (16)
Debentures of government-sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value 0 494
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (1)
Available-for-sale, greater than 12 continuous months, Fair value 9,853 9,769
Available-for-sale, greater than 12 continuous months, Unrealized loss (147) (231)
Available-for-sale, Total Securities in a loss position, Fair Value 9,853 10,263
Available-for-sale, Total Securities in a loss position, Unrealized loss (147) (232)
Privately-issued CMOs    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value 414 817
Available-for-sale, less than 12 continuous months, Unrealized loss (2) (15)
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 414 817
Available-for-sale, Total Securities in a loss position, Unrealized loss (2) (15)
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value 15,390  
Available-for-sale, less than 12 continuous months, Unrealized loss (93)  
Available-for-sale, greater than 12 continuous months, Fair value 585  
Available-for-sale, greater than 12 continuous months, Unrealized loss (2)  
Available-for-sale, Total Securities in a loss position, Fair Value 15,975  
Available-for-sale, Total Securities in a loss position, Unrealized loss (95)  
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held-to-maturity, less than 12 continuous months, Fair value 12,348 5,830
Held-to-maturity, less than 12 continuous months, Unrealized loss (47) (27)
Held-to-maturity, greater than 12 continuous months, Fair value 357 359
Held-to-maturity, greater than 12 continuous months, Unrealized loss (13) (13)
Held-to-maturity, Total Securities in a loss position, Fair value 12,705 6,189
Held-to-maturity, Gross Unrealized Losses (60) (40)
Available-for-sale, less than 12 continuous months, Fair value   2,695
Available-for-sale, less than 12 continuous months, Unrealized loss   (3)
Available-for-sale, greater than 12 continuous months, Fair value   1,112
Available-for-sale, greater than 12 continuous months, Unrealized loss   (5)
Available-for-sale, Total Securities in a loss position, Fair Value   3,807
Available-for-sale, Total Securities in a loss position, Unrealized loss   (8)
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held-to-maturity, less than 12 continuous months, Fair value 5,543 3,009
Held-to-maturity, less than 12 continuous months, Unrealized loss (5) (1)
Held-to-maturity, greater than 12 continuous months, Fair value 0 3,533
Held-to-maturity, greater than 12 continuous months, Unrealized loss 0 (24)
Held-to-maturity, Total Securities in a loss position, Fair value 5,543 6,542
Held-to-maturity, Gross Unrealized Losses (5) (25)
Available-for-sale, less than 12 continuous months, Fair value   1,002
Available-for-sale, less than 12 continuous months, Unrealized loss   (1)
Available-for-sale, greater than 12 continuous months, Fair value   990
Available-for-sale, greater than 12 continuous months, Unrealized loss   (3)
Available-for-sale, Total Securities in a loss position, Fair Value   1,992
Available-for-sale, Total Securities in a loss position, Unrealized loss   (4)
MBS pass-through securities issued by FHLMC and FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held-to-maturity, less than 12 continuous months, Fair value 2,356  
Held-to-maturity, less than 12 continuous months, Unrealized loss (7)  
Held-to-maturity, greater than 12 continuous months, Fair value 0  
Held-to-maturity, greater than 12 continuous months, Unrealized loss 0  
Held-to-maturity, Total Securities in a loss position, Fair value 2,356  
Held-to-maturity, Gross Unrealized Losses $ (7) $ 0