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Investment Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value    
Less than 12 Months $ 435,733 $ 305,174
12 Months or Longer 306,311 183,711
Total 742,044 488,885
Unrealized Losses    
Less than 12 Months (6,254) (2,448)
12 Months or Longer (14,423) (4,679)
Total (20,677) (7,127)
U.S. Treasury and U.S. Government-sponsored agencies    
Fair Value    
Less than 12 Months 77,217 11,436
12 Months or Longer 530 0
Total 77,747 11,436
Unrealized Losses    
Less than 12 Months (492) (24)
12 Months or Longer (13) 0
Total (505) (24)
Municipal securities    
Fair Value    
Less than 12 Months 61,743 39,298
12 Months or Longer 27,912 26,509
Total 89,655 65,807
Unrealized Losses    
Less than 12 Months (549) (384)
12 Months or Longer (907) (679)
Total (1,456) (1,063)
Residential    
Fair Value    
Less than 12 Months 139,277 175,847
12 Months or Longer 136,045 66,380
Total 275,322 242,227
Unrealized Losses    
Less than 12 Months (2,927) (1,296)
12 Months or Longer (6,509) (1,639)
Total (9,436) (2,935)
Commercial    
Fair Value    
Less than 12 Months 142,747 75,121
12 Months or Longer 139,847 90,822
Total 282,594 165,943
Unrealized Losses    
Less than 12 Months (2,242) (700)
12 Months or Longer (6,971) (2,361)
Total (9,213) (3,061)
Corporate obligations    
Fair Value    
Less than 12 Months 12,695 3,472
12 Months or Longer 1,977 0
Total 14,672 3,472
Unrealized Losses    
Less than 12 Months (44) (44)
12 Months or Longer (23) 0
Total $ (67) $ (44)