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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
investment_security
Dec. 31, 2018
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 5 105
Fair Value $ 20,167 $ 190,770
Gross Unrealized Holding Losses $ (81) $ (1,609)
12 Months or Longer    
Number | investment_security 113 244
Fair Value $ 207,272 $ 442,464
Gross Unrealized Holding Losses $ (2,499) $ (12,600)
Total    
Number | investment_security 118 349
Fair Value $ 227,439 $ 633,234
Gross Unrealized Holding Losses $ (2,580) $ (14,209)
Held-to-maturity, less than 12 months, number of securities | investment_security 0 3
Held-to-maturity, less than 12 months, fair value $ 0 $ 11,256
Held-to-maturity, less than 12 months, gross unrealized holding losses $ 0 $ (81)
Held-to-maturity, 12 months or longer, number of securities | investment_security 3 3
Held-to-maturity, 12 months or longer, fair value $ 15,466 $ 15,741
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ (128) $ (605)
Held-to-maturity, number of securities | investment_security 3 6
Held-to-maturity securities, fair value $ 15,466 $ 26,997
Unrealized Loss $ (128) $ (686)
Total securities, less than 12 months, number of securities | investment_security 5 108
Total securities, less than 12 months, fair value $ 20,167 $ 202,026
Total securities, less than 12 months, gross unrealized holding losses $ (81) $ (1,690)
Total securities, 12 months or longer, number of securities | investment_security 116 247
Total securities, 12 months or longer, fair value $ 222,738 $ 458,205
Total securities, 12 months or longer, gross unrealized holding losses $ (2,627) $ (13,205)
Total securities, number of securities | investment_security 121 355
Total securities, fair value $ 242,905 $ 660,231
Total securities, gross unrealized holding losses $ (2,708) $ (14,895)
Agency    
Less than 12 Months    
Number | investment_security 0 15
Fair Value $ 0 $ 26,229
Gross Unrealized Holding Losses $ 0 $ (333)
12 Months or Longer    
Number | investment_security 11 6
Fair Value $ 17,200 $ 10,434
Gross Unrealized Holding Losses $ (305) $ (186)
Total    
Number | investment_security 11 21
Fair Value $ 17,200 $ 36,663
Gross Unrealized Holding Losses $ (305) $ (519)
Corporate    
Less than 12 Months    
Number | investment_security 2 9
Fair Value $ 13,023 $ 47,805
Gross Unrealized Holding Losses $ (71) $ (471)
12 Months or Longer    
Number | investment_security 1 8
Fair Value $ 1,524 $ 19,369
Gross Unrealized Holding Losses $ (12) $ (435)
Total    
Number | investment_security 3 17
Fair Value $ 14,547 $ 67,174
Gross Unrealized Holding Losses $ (83) $ (906)
Municipal bonds    
Less than 12 Months    
Number | investment_security 2 60
Fair Value $ 6,441 $ 45,083
Gross Unrealized Holding Losses $ (5) $ (369)
12 Months or Longer    
Number | investment_security 28 102
Fair Value $ 14,907 $ 69,693
Gross Unrealized Holding Losses $ (124) $ (1,856)
Total    
Number | investment_security 30 162
Fair Value $ 21,348 $ 114,776
Gross Unrealized Holding Losses $ (129) $ (2,225)
Collateralized mortgage obligation: residential    
Less than 12 Months    
Number | investment_security 1 1
Fair Value $ 703 $ 814
Gross Unrealized Holding Losses $ (5) $ (1)
12 Months or Longer    
Number | investment_security 6 8
Fair Value $ 12,348 $ 18,104
Gross Unrealized Holding Losses $ (49) $ (424)
Total    
Number | investment_security 7 9
Fair Value $ 13,051 $ 18,918
Gross Unrealized Holding Losses $ (54) $ (425)
Mortgage-backed securities: residential    
Less than 12 Months    
Number | investment_security 0 20
Fair Value $ 0 $ 70,839
Gross Unrealized Holding Losses $ 0 $ (435)
12 Months or Longer    
Number | investment_security 67 120
Fair Value $ 161,293 $ 324,864
Gross Unrealized Holding Losses $ (2,009) $ (9,699)
Total    
Number | investment_security 67 140
Fair Value $ 161,293 $ 395,703
Gross Unrealized Holding Losses $ (2,009) $ (10,134)
Held-to-maturity, less than 12 months, number of securities | investment_security 0 3
Held-to-maturity, less than 12 months, fair value $ 0 $ 11,256
Held-to-maturity, less than 12 months, gross unrealized holding losses $ 0 $ (81)
Held-to-maturity, 12 months or longer, number of securities | investment_security 3 3
Held-to-maturity, 12 months or longer, fair value $ 15,466 $ 15,741
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ (128) $ (605)
Held-to-maturity, number of securities | investment_security 3 6
Held-to-maturity securities, fair value $ 15,466 $ 26,997
Unrealized Loss $ (128) $ (686)