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Investment Securities - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
security
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Securities transferred from available-for-sale to held-to-maturity | $     $ 27,422 $ 128,965 $ 129,000
Unrealized pre-tax loss from transfer of available-for-sale securities to held-to-maturity | $     278   3,000
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity | $ $ 132 $ 124 $ 268 $ 165 $ 165
Number of investment securities other-than-temporarily impaired 0   0    
Number of investment securities in unrealized loss position 266   266   198
Number of investment securities in unrealized loss position longer than 12 months 64   64    
Number of investment securities in unrealized loss position less than 12 months 201   201    
CMOs issued by FHLMC          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position longer than 12 months 5   5    
CMOs issued by FNMA          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position longer than 12 months 3   3    
CMOs issued by GNMA          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position longer than 12 months 2   2    
MBS pass-through securities issued by FHLMC and FNMA          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position longer than 12 months 22   22    
Number of investment securities in unrealized loss position less than 12 months 36   36    
Obligations of state and political subdivisions          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position longer than 12 months 32   32    
Number of investment securities in unrealized loss position less than 12 months 98   98    
SBA-backed securities          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position less than 12 months 11   11    
Debentures of government- sponsored agencies          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position less than 12 months 8   8    
Collateralized Mortgage Obligations          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position less than 12 months 46   46    
Corporate bonds          
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]          
Number of investment securities in unrealized loss position less than 12 months 3   3