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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Derivative financial instrument according to type of hedge [Abstract]    
Unrealized losses on cash flow hedges, net of tax $ (30)  
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 7,389 $ 5,155
Liability Derivatives 5,657 2,326
Interest-Rate Cap Agreements [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Unrecognized premiums $ 2,400 2,700
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 $ 175,000 $ 175,000
Average Maturity 2 years 8 months 12 days 3 years 6 months
Fair Value $ 98 $ 2,525
Cash Flow Hedge Designation [Member] | Interest-Rate Cap Agreements [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 150,000 $ 150,000
Average Maturity 2 years 9 months 18 days 3 years 7 months 6 days
Fair Value $ 318 $ 2,245
Designated as Hedging Instrument [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 318 2,525
Liability Derivatives 611 0
No Hedge Designation [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 505,731 $ 285,148
Average Maturity 3 years 1 month 6 days 3 years 8 months 12 days
Fair Value $ 2,025 $ 304
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 7,071 2,630
Liability Derivatives 5,046 2,326
No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 79,446 $ 32,473
Average Maturity 1 month 6 days 1 month 6 days
Fair Value $ 2,051 $ 687
No Hedge Designation [Member] | Mandatory Commitments to Sell Mortgage Loans [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 137,315 $ 57,583
Average Maturity 1 month 6 days 1 month 6 days
Fair Value $ (27) $ (383)
No Hedge Designation [Member] | Purchased Options [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 3,088 $ 3,095
Average Maturity 1 year 9 months 18 days 2 years 6 months
Fair Value $ 125 $ 116
No Hedge Designation [Member] | Written Options [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 3,028 $ 3,095
Average Maturity 1 year 9 months 18 days 2 years 6 months
Fair Value $ (124) $ (116)
Fixed Income Interest Rate [Member] | Fair Value Hedge Designation [Member] | Interest Rate Swap [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 7,117  
Average Maturity 9 years 7 months 6 days  
Fair Value $ (391)  
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 $ 25,000
Average Maturity 1 year 9 months 18 days 2 years 7 months 6 days
Fair Value $ (220) $ 280
Fixed Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 141,427 $ 94,451
Average Maturity 5 years 4 months 24 days 5 years 6 months
Fair Value $ (4,849) $ 405
Variable Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap [Member]    
Derivative financial instrument according to type of hedge [Abstract]    
Notional Amount $ 141,427 $ 94,451
Average Maturity 5 years 4 months 24 days 5 years 6 months
Fair Value $ 4,849 $ (405)
Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest-Rate Cap Agreements [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 318 2,245
Other Assets [Member] | No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 2,051 687
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 0
Other Assets [Member] | No Hedge Designation [Member] | Purchased Options [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 125 116
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 0 280
Other Assets [Member] | Fixed Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Asset Derivatives 23 1,116
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 4,872 711
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 27 383
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 124 116
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 611 0
Other Liabilities [Member] | Fixed Income Interest Rate [Member] | No Hedge Designation [Member] | Interest Rate Swap [Member]    
Fair value of derivative instruments, balance sheet location [Abstract]    
Liability Derivatives 4,872 711
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 $ 23 $ 1,116