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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
investment_security
Dec. 31, 2016
USD ($)
investment_security
Less than 12 months    
Number | investment_security 155 215
Fair Value $ 246,564 $ 262,191
Gross Unrealized Holding Losses $ (4,197) $ (4,984)
12 months or Longer    
Number | investment_security 6 4
Fair Value $ 20,105 $ 16,039
Gross Unrealized Holding Losses $ (389) $ (519)
Total    
Number | investment_security 161 219
Fair Value $ 266,669 $ 278,230
Gross Unrealized Holding Losses $ (4,586) $ (5,503)
Held-to-maturity, less than 12 months, number of securities | investment_security 1 1
Held-to-maturity, less than 12 months, fair value $ 6,970 $ 7,271
Held-to-maturity, less than 12 months, gross unrealized holding losses $ (125) $ (104)
Held-to-maturity, 12 months or longer, number of securities | investment_security 0 0
Held-to-maturity, 12 months or longer, fair value $ 0 $ 0
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ 0 $ 0
Held-to-maturity, number of securities | investment_security 1 1
Held-to-maturity securities, fair value $ 6,970 $ 7,271
Unrealized Loss $ 125 $ 104
Total securities, less than 12 months, number of securities | investment_security 156 216
Total securities, less than 12 months, fair value $ 253,534 $ 269,462
Total securities, less than 12 months, gross unrealized holding losses $ 4,322 $ 5,088
Total securities, 12 months or longer, number of securities | investment_security 6 4
Total securities, 12 months or longer, fair value $ 20,105 $ 16,039
Total securities, 12 months or longer, gross unrealized holding losses $ 389 $ 519
Total securities, number of securities | investment_security 162 220
Total securities, fair value $ 273,639 $ 285,501
Total securities, gross unrealized holding losses $ 4,711 $ 5,607
Corporate    
Less than 12 months    
Number | investment_security 3 3
Fair Value $ 7,629 $ 7,609
Gross Unrealized Holding Losses $ (173) $ (205)
12 months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Holding Losses $ 0 $ 0
Total    
Number | investment_security 3 3
Fair Value $ 7,629 $ 7,609
Gross Unrealized Holding Losses $ (173) $ (205)
Municipal bonds    
Less than 12 months    
Number | investment_security 90 152
Fair Value $ 53,419 $ 85,750
Gross Unrealized Holding Losses $ (1,189) $ (1,690)
12 months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Holding Losses $ 0 $ 0
Total    
Number | investment_security 90 152
Fair Value $ 53,419 $ 85,750
Gross Unrealized Holding Losses $ (1,189) $ (1,690)
Collateralized mortgage obligation: residential    
Less than 12 months    
Number | investment_security 5 5
Fair Value $ 17,032 $ 19,092
Gross Unrealized Holding Losses $ (187) $ (173)
12 months or Longer    
Number | investment_security 0 0
Fair Value $ 0 $ 0
Gross Unrealized Holding Losses $ 0 $ 0
Total    
Number | investment_security 5 5
Fair Value $ 17,032 $ 19,092
Gross Unrealized Holding Losses $ (187) $ (173)
Mortgage-backed securities    
Less than 12 months    
Number | investment_security 57 55
Fair Value $ 168,484 $ 149,740
Gross Unrealized Holding Losses $ (2,648) $ (2,916)
12 months or Longer    
Number | investment_security 6 4
Fair Value $ 20,105 $ 16,039
Gross Unrealized Holding Losses $ (389) $ (519)
Total    
Number | investment_security 63 59
Fair Value $ 188,589 $ 165,779
Gross Unrealized Holding Losses $ (3,037) $ (3,435)
Held-to-maturity, less than 12 months, number of securities | investment_security 1 1
Held-to-maturity, less than 12 months, fair value $ 6,970 $ 7,271
Held-to-maturity, less than 12 months, gross unrealized holding losses $ (125) $ (104)
Held-to-maturity, 12 months or longer, number of securities | investment_security 0 0
Held-to-maturity, 12 months or longer, fair value $ 0 $ 0
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ 0 $ 0
Held-to-maturity, number of securities | investment_security 1 1
Held-to-maturity securities, fair value $ 6,970 $ 7,271
Unrealized Loss $ 125 $ 104