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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Derivative Asset, Notional Amount $ 874 $ 4,795
Derivative Asset, Fair Value, Gross Asset 10 25
Derivative Liability, Notional Amount 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Notional amount 874 4,800
Short [Member] | Forward Contracts [Member]    
Derivative [Line Items]    
Derivative Asset, Notional Amount 0 2,452
Derivative Asset, Fair Value, Gross Asset 0 8
Derivative Liability, Notional Amount 874 2,343
Derivative Liability, Fair Value, Gross Liability 3 5
Notional amount 874 4,800
Other assets | Interest Rate Swap | Not Designated as Hedging Instrument | Correspondent Banks    
Derivative [Line Items]    
Notional amount $ 36,972 $ 103,363
Weighted average remaining term (years) 6 years 4 months 24 days 8 years 2 months 12 days
Fixed rate (weighted average) 5.12% 4.57%
Variable rate (weighted average) 4.56% 3.63%
Estimated fair value $ 868 $ 834
Other assets | Interest Rate Swap | Not Designated as Hedging Instrument | Customers    
Derivative [Line Items]    
Notional amount $ 237,916 $ 170,794
Weighted average remaining term (years) 6 years 9 months 18 days 6 years 8 months 12 days
Fixed rate (weighted average) 4.69% 3.80%
Variable rate (weighted average) 4.36% 4.20%
Estimated fair value $ 6,191 $ 3,672
Other liabilities | Interest Rate Swap | Not Designated as Hedging Instrument | Correspondent Banks    
Derivative [Line Items]    
Notional amount $ 237,916 $ 170,794
Weighted average remaining term (years) 6 years 9 months 18 days 6 years 8 months 12 days
Fixed rate (weighted average) 4.36% 4.20%
Variable rate (weighted average) 4.69% 3.80%
Estimated fair value $ 6,191 $ 3,672
Other liabilities | Interest Rate Swap | Not Designated as Hedging Instrument | Customers    
Derivative [Line Items]    
Notional amount $ 36,972 $ 103,363
Weighted average remaining term (years) 6 years 4 months 24 days 8 years 2 months 12 days
Fixed rate (weighted average) 4.56% 3.63%
Variable rate (weighted average) 5.12% 4.57%
Estimated fair value $ 868 $ 834