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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Interest rate swaps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 360,000 $ 60,000
Interest rate swaps with customers [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 993,031 991,002
Mirror swaps with counterparties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 993,031 991,002
Risk participation-in agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 147,732 92,717
Interest rate lock commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 82,082 167,671
Forward sale commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 155,905 279,653
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate swaps [Member] | Commercial Loan    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 300,000  
Derivatives Designated as Cash Flow Hedging Instruments [Member] | Interest rate swaps [Member] | Federal Home Loan Bank Advances    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 60,000 60,000
Not Designated as Hedging Instrument [Member] | Interest rate swaps with customers [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 993,000 991,000
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 993,000 991,000
Not Designated as Hedging Instrument [Member] | Risk participation-out agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount 67,600 61,600
Not Designated as Hedging Instrument [Member] | Risk participation-in agreement [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Notional amount $ 147,700 $ 92,700