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Investment Securities - Investment Securities in Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
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 23 54
Held-to-maturity, less than 12 continuous months, Fair value $ 4,587 $ 14,152
Held-to-maturity, less than 12 continuous months, Unrealized loss (15) (41)
Held-to-maturity, greater than 12 continuous months, Fair value 2,320 1,999
Held-to-maturity, greater than 12 continuous months, Unrealized loss (7) (1)
Held-to-maturity, Total Securities in a loss position, Fair value 6,907 16,151
Held-to-maturity, Gross Unrealized Losses (22) (42)
Available-for-sale, less than 12 continuous months, Fair value 45,536 221,857
Available-for-sale, less than 12 continuous months, Unrealized loss (140) (1,273)
Available-for-sale, greater than 12 continuous months, Fair value 15,173 17,987
Available-for-sale, greater than 12 continuous months, Unrealized loss (67) (233)
Available-for-sale, Total Securities in a loss position, Fair Value 60,709 239,844
Available-for-sale, Total Securities in a loss position, Unrealized loss (207) (1,506)
Marketable securities, less than 12 continuous months, Fair value 50,123 236,009
Marketable securities, less than 12 continuous months, Unrealized loss (155) (1,314)
Marketable securities, greater than 12 continuous months, Fair value 17,493 19,986
Marketable securities, greater than 12 continuous months, Unrealized loss (74) (234)
Marketable securities, Total Securities in a loss position, Fair value 67,616 255,995
Marketable securities, Total Securities in a loss position, Unrealized loss $ (229) $ (1,548)
Number of investment securities in unrealized loss position longer than 12 months | security 4  
Number of investment securities in unrealized loss position less than 12 months | security 19  
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 $ 21,435
Available-for-sale, less than 12 continuous months, Unrealized loss (64)
Available-for-sale, greater than 12 continuous months, Fair value 0
Available-for-sale, greater than 12 continuous months, Unrealized loss 0
Available-for-sale, Total Securities in a loss position, Fair Value 21,435
Available-for-sale, Total Securities in a loss position, Unrealized loss (64)
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 6,515 $ 68,809
Available-for-sale, less than 12 continuous months, Unrealized loss (16) (454)
Available-for-sale, greater than 12 continuous months, Fair value 2,986 0
Available-for-sale, greater than 12 continuous months, Unrealized loss (31) 0
Available-for-sale, Total Securities in a loss position, Fair Value 9,501 68,809
Available-for-sale, Total Securities in a loss position, Unrealized loss (47) (454)
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 1,938 9,277
Available-for-sale, less than 12 continuous months, Unrealized loss (12) (80)
Available-for-sale, greater than 12 continuous months, Fair value 0 3,158
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (64)
Available-for-sale, Total Securities in a loss position, Fair Value 1,938 12,435
Available-for-sale, Total Securities in a loss position, Unrealized loss (12) (144)
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 0 0
Available-for-sale, less than 12 continuous months, Unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, Fair value 2,219 1,989
Available-for-sale, greater than 12 continuous months, Unrealized loss (4) (39)
Available-for-sale, Total Securities in a loss position, Fair Value 2,219 1,989
Available-for-sale, Total Securities in a loss position, Unrealized loss (4) (39)
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 9,967 164
Available-for-sale, less than 12 continuous months, Unrealized loss (30) 0
Available-for-sale, greater than 12 continuous months, Fair value 9,968 2,374
Available-for-sale, greater than 12 continuous months, Unrealized loss (32) (15)
Available-for-sale, Total Securities in a loss position, Fair Value 19,935 2,538
Available-for-sale, Total Securities in a loss position, Unrealized loss (62) (15)
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 212 136,064
Available-for-sale, less than 12 continuous months, Unrealized loss (1) (713)
Available-for-sale, greater than 12 continuous months, Fair value 0 9,887
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (113)
Available-for-sale, Total Securities in a loss position, Fair Value 212 145,951
Available-for-sale, Total Securities in a loss position, Unrealized loss (1) (826)
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 2,487  
Available-for-sale, less than 12 continuous months, Unrealized loss (3)  
Available-for-sale, greater than 12 continuous months, Fair value 0  
Available-for-sale, greater than 12 continuous months, Unrealized loss 0  
Available-for-sale, Total Securities in a loss position, Fair Value 2,487  
Available-for-sale, Total Securities in a loss position, Unrealized loss (3)  
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value 2,982  
Available-for-sale, less than 12 continuous months, Unrealized loss (14)  
Available-for-sale, greater than 12 continuous months, Fair value 0  
Available-for-sale, greater than 12 continuous months, Unrealized loss 0  
Available-for-sale, Total Securities in a loss position, Fair Value 2,982  
Available-for-sale, Total Securities in a loss position, Unrealized loss (14)  
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 1,057 8,297
Held-to-maturity, less than 12 continuous months, Unrealized loss (12) (19)
Held-to-maturity, greater than 12 continuous months, Fair value 0 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss 0 0
Held-to-maturity, Total Securities in a loss position, Fair value 1,057 8,297
Held-to-maturity, Gross Unrealized Losses (12) (19)
Available-for-sale, less than 12 continuous months, Fair value   4,557
Available-for-sale, less than 12 continuous months, Unrealized loss   (15)
Available-for-sale, greater than 12 continuous months, Fair value   579
Available-for-sale, greater than 12 continuous months, Unrealized loss   (2)
Available-for-sale, Total Securities in a loss position, Fair Value   5,136
Available-for-sale, Total Securities in a loss position, Unrealized loss   (17)
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 3,530 3,523
Held-to-maturity, less than 12 continuous months, Unrealized loss (3) (15)
Held-to-maturity, greater than 12 continuous months, Fair value 0 1,999
Held-to-maturity, greater than 12 continuous months, Unrealized loss 0 (1)
Held-to-maturity, Total Securities in a loss position, Fair value 3,530 5,522
Held-to-maturity, Gross Unrealized Losses (3) (16)
Available-for-sale, less than 12 continuous months, Fair value   2,986
Available-for-sale, less than 12 continuous months, Unrealized loss   (11)
Available-for-sale, greater than 12 continuous months, Fair value   0
Available-for-sale, greater than 12 continuous months, Unrealized loss   0
Available-for-sale, Total Securities in a loss position, Fair Value   2,986
Available-for-sale, Total Securities in a loss position, Unrealized loss   (11)
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 0 2,332
Held-to-maturity, less than 12 continuous months, Unrealized loss 0 (7)
Held-to-maturity, greater than 12 continuous months, Fair value 2,320 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss (7) 0
Held-to-maturity, Total Securities in a loss position, Fair value 2,320 2,332
Held-to-maturity, Gross Unrealized Losses $ (7) $ (7)