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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
derivative_instrument
Dec. 31, 2018
USD ($)
derivative_instrument
Interest rate swaps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 60,000 $ 60,000
Interest rate swaps with customers [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 729,913 648,050
Mirror swaps with counterparties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 729,913 648,050
Risk participation-in agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 73,040 46,510
Foreign exchange contracts [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 2,648 2,784
Interest rate lock commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 84,820 30,766
Forward sale commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 156,594 61,993
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate caps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 22,700 $ 22,681
Number of instruments held | derivative_instrument 2 2
Interest rate cap interest rate 4.50% 4.50%
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate swaps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 60,000 $ 60,000
Number of instruments held | derivative_instrument 2 2
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate floors [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 300,000 $ 300,000
Number of instruments held | derivative_instrument 3 3
Interest rate floor interest rate 1.00% 1.00%
Not Designated as Hedging Instrument [Member] | Interest rate swaps with customers [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 729,900 $ 648,000
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 729,913 648,049
Not Designated as Hedging Instrument [Member] | Risk participation-out agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 44,500 57,300
Not Designated as Hedging Instrument [Member] | Risk participation-in agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 73,000 46,500
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 2,600 $ 2,800