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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
derivative_instrument
Dec. 31, 2019
USD ($)
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 960,481 813,458
Mirror swaps with counterparties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 960,481 813,458
Risk participation-in agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 88,623 72,866
Interest rate lock commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 161,720 51,439
Forward sale commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 220,284 94,829
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 $ 22,700
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 $ 200,000 $ 300,000
Number of instruments held | derivative_instrument 2 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 $ 960,500 $ 813,500
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 960,500 813,500
Not Designated as Hedging Instrument [Member] | Risk participation-out agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 61,000 61,200
Not Designated as Hedging Instrument [Member] | Risk participation-in agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 88,600 $ 72,900