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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
derivative_instrument
Dec. 31, 2018
USD ($)
derivative_instrument
Interest rate swaps [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount $ 60,000 $ 60,000
Interest rate swaps with customers [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 813,458 648,050
Mirror swaps with counterparties [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 813,458 648,050
Risk participation-in agreement [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 72,866 46,510
Foreign exchange contracts [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 0 2,784
Interest rate lock commitments [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 51,439 30,766
Forward sale commitments [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount $ 94,829 $ 61,993
Designated as Hedging Instrument [Member] | Interest rate caps [Member]    
Derivatives, Fair Value [Line Items]    
Number of derivative instruments held | derivative_instrument 2 2
Notional amount $ 22,700 $ 22,700
Interest rate cap strike 4.50%  
Designated as Hedging Instrument [Member] | Interest rate swaps [Member]    
Derivatives, Fair Value [Line Items]    
Number of derivative instruments held | derivative_instrument 2 2
Notional amount $ 60,000 $ 60,000
Designated as Hedging Instrument [Member] | Interest rate floors [Member]    
Derivatives, Fair Value [Line Items]    
Number of derivative instruments held | derivative_instrument 3 3
Notional amount $ 300,000 $ 300,000
Interest rate floor strike 1.00%  
Not Designated as Hedging Instrument [Member] | Interest rate swaps with customers [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount $ 813,500 648,000
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 813,500 648,000
Not Designated as Hedging Instrument [Member] | Risk participation-out agreement [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 61,200 57,300
Not Designated as Hedging Instrument [Member] | Risk participation-in agreement [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount $ 72,900 46,500
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount   $ 2,800