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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Derivative financial instrument according to type of hedge [Abstract]    
Unrealized gain on cash flow hedges, net of tax $ 410  
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 6,307 $ 3,080
Liability Derivatives 2,573 1,292
Interest-Rate Cap Agreements [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Unrecognized premiums $ 1,500 900
Maximum [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Term of cash flow hedge 4 years  
Cash Flow Hedge Designation [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 115,000 $ 60,000
Average Maturity 3 years 3 months 18 days 3 years 7 months 6 days
Fair Value $ 2,729 $ 1,221
Cash Flow Hedge Designation [Member] | Interest-Rate Cap Agreements [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 90,000 $ 45,000
Average Maturity 3 years 3 months 18 days 3 years 6 months
Fair Value $ 2,235 $ 976
Designated as Hedging Instrument [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 2,729 1,221
Liability Derivatives 0 0
No Hedge Designation [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 326,705 $ 239,377
Average Maturity 3 years 1 month 6 days 4 years 1 month 6 days
Fair Value $ 1,005 $ 567
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 3,578 1,859
Liability Derivatives 2,573 1,292
No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 55,093 $ 25,032
Average Maturity 1 month 6 days 1 month 6 days
Fair Value $ 1,202 $ 530
No Hedge Designation [Member] | Mandatory Commitments to Sell Mortgage Loans [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 87,640 $ 56,127
Average Maturity 1 month 6 days 1 month 6 days
Fair Value $ (233) $ 37
No Hedge Designation [Member] | Purchased Options [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 3,119 $ 3,119
Average Maturity 3 years 3 years 6 months
Fair Value $ 223 $ 322
No Hedge Designation [Member] | Written Options [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 3,119 $ 3,119
Average Maturity 3 years 3 years 6 months
Fair Value $ (223) $ (322)
Fixed Income Interest Rate [Member] | Cash Flow Hedge Designation [Member] | Interest Rate Swap [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 25,000 $ 15,000
Average Maturity 3 years 1 month 6 days 3 years 8 months 12 days
Fair Value $ 494 $ 245
Fixed Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap - Commercial [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 83,867 $ 75,990
Average Maturity 5 years 10 months 24 days 6 years 2 months 12 days
Fair Value $ 1,835 $ 292
Variable Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap - Commercial [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 83,867 $ 75,990
Average Maturity 5 years 10 months 24 days 6 years 2 months 12 days
Fair Value $ (1,835) $ (292)
Variable Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 10,000  
Average Maturity 2 months 12 days  
Fair Value $ 36  
Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest-Rate Cap Agreements [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 2,235 976
Other Assets [Member] | No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 1,202 530
Other Assets [Member] | No Hedge Designation [Member] | Mandatory Commitments to Sell Mortgage Loans [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 0 37
Other Assets [Member] | No Hedge Designation [Member] | Purchased Options [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 223 322
Other Assets [Member] | No Hedge Designation [Member] | Written Options [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 0 0
Other Assets [Member] | Fixed Income Interest Rate [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 494 245
Other Assets [Member] | Fixed Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap - Commercial [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 1,976 631
Other Assets [Member] | Variable Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap - Commercial [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 141 339
Other Assets [Member] | Variable Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 36 0
Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest-Rate Cap Agreements [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 0 0
Other Liabilities [Member] | No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 0 0
Other Liabilities [Member] | No Hedge Designation [Member] | Mandatory Commitments to Sell Mortgage Loans [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 233 0
Other Liabilities [Member] | No Hedge Designation [Member] | Purchased Options [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 0 0
Other Liabilities [Member] | No Hedge Designation [Member] | Written Options [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 223 322
Other Liabilities [Member] | Fixed Income Interest Rate [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 0 0
Other Liabilities [Member] | Fixed Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap - Commercial [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 141 339
Other Liabilities [Member] | Variable Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap - Commercial [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 1,976 631
Other Liabilities [Member] | Variable Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives $ 0 $ 0