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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
investment_security
Dec. 31, 2015
USD ($)
investment_security
Less than 12 months    
Number | investment_security 37 71
Fair Value $ 64,327 $ 121,775
Gross Unrealized Holding Losses $ (261) $ (923)
12 months or Longer    
Number | investment_security 5 9
Fair Value $ 15,117 $ 16,284
Gross Unrealized Holding Losses $ (175) $ (468)
Total    
Number | investment_security 42 80
Fair Value $ 79,444 $ 138,059
Gross Unrealized Holding Losses (436) $ (1,391)
Held-to-maturity, less than 12 months, number of securities | investment_security   1
Held-to-maturity, less than 12 months, fair value   $ 8,330
Held-to-maturity, less than 12 months, gross unrealized holding losses   $ (70)
Held-to-maturity, 12 months or longer, number of securities | investment_security   0
Held-to-maturity, 12 months or longer, fair value   $ 0
Held-to-maturity, 12 months or longer, gross unrealized holding losses   $ 0
Held-to-maturity, number of securities | investment_security   1
Held-to-maturity securities, fair value   $ 8,330
Unrealized Loss $ 0 $ 70
Total securities, less than 12 months, number of securities | investment_security   72
Total securities, less than 12 months, fair value   $ 130,105
Total securities, less than 12 months, gross unrealized holding losses   $ (993)
Total securities, 12 months or longer, number of securities | investment_security   9
Total securities, 12 months or longer, fair value   $ 16,284
Total securities, 12 months or longer, gross unrealized holding losses   $ (468)
Total securities, number of securities | investment_security   81
Total securities, fair value   $ 146,389
Total securities, gross unrealized holding losses   $ 1,461
Municipal bonds    
Less than 12 months    
Number | investment_security 17 32
Fair Value $ 8,376 $ 15,516
Gross Unrealized Holding Losses $ (39) $ (61)
12 months or Longer    
Number | investment_security 0 6
Fair Value $ 0 $ 3,349
Gross Unrealized Holding Losses $ 0 $ (36)
Total    
Number | investment_security 17 38
Fair Value $ 8,376 $ 18,865
Gross Unrealized Holding Losses $ (39) $ (97)
Collateralized mortgage obligation    
Less than 12 months    
Number | investment_security 1 5
Fair Value $ 4,863 $ 22,771
Gross Unrealized Holding Losses $ (6) $ (183)
12 months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Holding Losses $ 0 $ 0
Total    
Number | investment_security 1 5
Fair Value $ 4,863 $ 22,771
Gross Unrealized Holding Losses $ (6) $ (183)
Mortgage-backed securities    
Less than 12 months    
Number | investment_security 19 34
Fair Value $ 51,088 $ 83,488
Gross Unrealized Holding Losses $ (216) $ (679)
12 months or Longer    
Number | investment_security 5 3
Fair Value $ 15,117 $ 12,935
Gross Unrealized Holding Losses $ (175) $ (432)
Total    
Number | investment_security 24 37
Fair Value $ 66,205 $ 96,423
Gross Unrealized Holding Losses (391) $ (1,111)
Held-to-maturity, less than 12 months, number of securities | investment_security   1
Held-to-maturity, less than 12 months, fair value   $ 8,330
Held-to-maturity, less than 12 months, gross unrealized holding losses   $ (70)
Held-to-maturity, 12 months or longer, number of securities | investment_security   0
Held-to-maturity, 12 months or longer, fair value   $ 0
Held-to-maturity, 12 months or longer, gross unrealized holding losses   $ 0
Held-to-maturity, number of securities | investment_security   1
Held-to-maturity securities, fair value   $ 8,330
Unrealized Loss $ 0 $ 70