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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
derivative_instrument
Dec. 31, 2019
USD ($)
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 991,002 813,458
Mirror swaps with counterparties [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 991,002 813,458
Risk participation-in agreement [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 92,717 72,866
Interest rate lock commitments [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 167,671 51,439
Forward sale commitments [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount $ 279,653 $ 94,829
Designated as Hedging Instrument [Member] | Interest rate caps [Member]    
Derivatives, Fair Value [Line Items]    
Number of derivative instruments held | derivative_instrument   2
Notional amount   $ 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
Notional amount   $ 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 991,000 $ 813,500
Not Designated as Hedging Instrument [Member] | Mirror swaps with counterparties [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 991,000 813,500
Not Designated as Hedging Instrument [Member] | Risk participation-out agreement [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount 61,600 61,200
Not Designated as Hedging Instrument [Member] | Risk participation-in agreement [Member]    
Derivatives, Fair Value [Line Items]    
Notional amount $ 92,700 $ 72,900