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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
derivative_instrument
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
derivative_instrument
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
derivative_instrument
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Amount of ineffectiveness recorded in earnings $ 0 $ 0 $ 0 $ 0  
Interest rate swaps [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount 60,000   60,000   $ 60,000
Interest rate swaps with customers [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount 574,364   574,364   545,049
Mirror swaps with counterparties [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount 574,364   574,364   545,049
Risk participation-in agreement [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount 36,610   36,610   34,052
Foreign exchange contracts [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount $ 2,907   $ 2,907   $ 3,005
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate caps [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Number of instruments held | derivative_instrument 2   2   2
Notional amount $ 22,700   $ 22,700   $ 22,700
Interest rate cap interest rate 4.50%   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]          
Number of instruments held | derivative_instrument 2   2   2
Notional amount $ 60,000   $ 60,000   $ 60,000
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate floors [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Number of instruments held | derivative_instrument 3   3   3
Notional amount $ 300,000   $ 300,000   $ 300,000
Interest rate floor interest rate 1.00%   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 $ 574,400   $ 574,400   $ 545,000
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount 574,400   574,400   545,000
Not Designated as Hedging Instrument [Member] | Risk participation-out agreement [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount 51,500   51,500   52,400
Not Designated as Hedging Instrument [Member] | Risk participation-in agreement [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount 36,600   36,600   34,100
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Notional amount $ 2,900   $ 2,900   $ 3,000